@article {1538, title = {Multiple instance classification via quadratic programming}, journal = {Journal of Global Optimization}, year = {2022}, pages = {1{\textendash}32}, author = {Emel {\c S}eyma K{\"u}{\c c}{\"u}ka{\c s}c{\i} and Mustafa Gokce Baydogan and Z C Ta{\c s}k{\i}n} } @article {1540, title = {A branch-and-price algorithm for parallel machine campaign planning under sequence dependent family setups and co-production}, journal = {Computers \& Operations Research}, volume = {135}, year = {2021}, pages = {105430}, doi = {https://doi.org/10.1016/j.cor.2021.105430}, author = {Serkan Kalay and Z C Ta{\c s}k{\i}n} } @article {1539, title = {A Branch-Price-and-Cut Algorithm for Optimal Decoding of LDPC Codes}, journal = {Journal of Global Optimization}, volume = {81}, year = {2021}, pages = {805{\textendash}834}, doi = {https://doi.org/10.1007/s10898-021-01073-4}, author = {Banu Kabakulak and Z C Ta{\c s}k{\i}n and Ali Emre Pusane} } @article {1424, title = {A linear programming approach to multiple instance learning}, journal = {Turkish Journal of Electrical Engineering \& Computer Sciences}, volume = {29}, year = {2021}, pages = {2186{\textendash}2201}, author = {Emel {\c S}eyma K{\"u}{\c c}{\"u}ka{\c s}c{\i} and Mustafa Gokce Baydogan and Z C Ta{\c s}k{\i}n} } @article {1541, title = {Single Machine Campaign Planning under Sequence Dependent Family Setups and Co-Production}, journal = {Journal of the Operational Research Society}, volume = {72}, year = {2021}, pages = {2091{\textendash}2111}, doi = {https://doi.org/10.1080/01605682.2020.1772016}, author = {Serkan Kalay and Z C Ta{\c s}k{\i}n} } @article {1426, title = {A branch-and-cut algorithm for a bipartite graph construction problem in digital communication systems}, journal = {Networks}, volume = {75}, year = {2020}, pages = {137-157}, abstract = {

Abstract We study a bipartite graph (BG) construction problem that arises in digital communication systems. In a digital communication system, information is sent from one place to another over a noisy communication channel using binary symbols (bits). The original information is encoded by adding redundant bits, which are then used to detect and correct errors that may have been introduced during transmission. Harmful structures, such as small cycles, severely deteriorate the error correction capability of a BG. We introduce an integer programming formulation to generate a BG for a given smallest cycle length. We propose a branch-and-cut algorithm for its solution and investigate the structural properties of the problem to derive valid inequalities and variable fixing rules. We also introduce heuristics to obtain feasible solutions for the problem. The computational experiments show that our algorithm can generate BGs without small cycles in an acceptable amount of time for practically relevant dimensions.

}, keywords = {bipartite graphs, branch-and-cut algorithm, integer programming, symmetry, telecommunications, valid inequalities}, doi = {https://doi.org/10.1002/net.21914}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/net.21914}, author = {Banu Kabakulak and Z C Ta{\c s}k{\i}n and Pusane, Ali E.} } @article {1446, title = {Gradual covering location problem with multi-type facilities considering customer preferences}, journal = {Computers \& Industrial Engineering}, volume = {147}, year = {2020}, pages = {106577}, abstract = {

In this paper, we address a discrete facility location problem where a retailer aims at locating new facilities with possibly different characteristics. Customers visit the facilities based on their preferences which are represented as probabilities. These probabilities are determined in a novel way by using a fuzzy clustering algorithm. It is assumed that the sum of the probabilities with which customers at a given demand zone patronize different types of facilities is equal to one. However, among the same type of facilities they choose the closest facility, and the strength at which this facility covers the customer is based on two distances referred to as full coverage distance and gradual (partial) coverage distance. If the distance between the customer location and the closest facility is smaller (larger) than the full (partial) coverage distance, this customer is fully (not) covered, whereas for all distance values between full and partial coverage, the customer is partially covered. Both distance values depend on both the customer attributes and the type of the facility. Furthermore, facilities can only be opened if their revenue exceeds a certain threshold value. A final restriction is incorporated into the model by defining a minimum separation distance between the same facility types. This restriction is also extended to the case where a minimum threshold distance exists among facilities of different types. The objective of the retailer is to find the optimal locations and types of the new facilities in order to maximize its profit. Two versions of the problem are formulated using integer linear programming, which differ according to whether the minimum separation distance applies to the same facility type or different facility types. The resulting integer linear programming models are solved by three approaches: commercial solver CPLEX, heuristics based on Lagrangean relaxation, and local search implemented with 1-Add and 1-Swap moves. Apart from experimentally assessing the accuracy and the efficiency of the solution methods on a set of randomly generated test instances, we also carry out sensitivity analysis using a real-world problem instance.

}, keywords = {Customer preferences, Facility location, Fuzzy c-means clustering, Gradual coverage, Lagrangean relaxation}, issn = {0360-8352}, doi = {https://doi.org/10.1016/j.cie.2020.106577}, url = {https://www.sciencedirect.com/science/article/pii/S0360835220303119}, author = {Hande K{\"u}{\c c}{\"u}kaydin and Necati Aras} } @article {1453, title = {Next-day operating room scheduling with uncertain surgery durations: Exact analysis and heuristics}, journal = {European Journal of Operational Research}, volume = {286}, year = {2020}, pages = {49-62}, abstract = {

Operating rooms are units of particular interest in hospitals as they constitute more than 40\% of total expenses and revenues. Managing operating rooms is challenging due to conflicting priorities and preferences of various stakeholders and the inherent uncertainty of surgery durations. In this study, we consider the next-day scheduling problem of a hospital operating room. Given the list and the sequence of non-identical surgeries to be performed in the next day, one needs to determine the scheduled durations of surgeries where the actual duration of each surgery is uncertain. Our objective is to minimize the weighted sum of expected patient waiting times, room idle time and overtime. First, we provide a reformulation of the objective function in terms of auxiliary functions with a recursive pattern that enables exact analysis of the optimal surgery durations at the expense of high CPU time. Next, we develop and analyze simple-to-use and close-to-optimal scheduling heuristics motivated by practice, for the OR managers to deploy in the field. Our proposed hybrid heuristic attains 1.22\% average performance gap and worst average optimality gap of 2.77\%. Our solution is easy to implement as it does not require any advanced optimization tool, which is the reality of many operating room environments.

}, keywords = {Heuristics, Operating room planning, OR in health services, Scheduling, Stochastic optimization}, issn = {0377-2217}, doi = {https://doi.org/10.1016/j.ejor.2020.03.002}, url = {https://www.sciencedirect.com/science/article/pii/S0377221720302162}, author = {Taghi Khaniyev and Enis Kay{\i}{\c s} and Refik G{\"u}ll{\"u}} } @article {1473, title = {Profitable Decarbonization through E-Mobility}, journal = {Energies}, volume = {13}, year = {2020}, abstract = {

This paper focuses on the interdependent relationship of power generation, transportation and CO2 emissions to evaluate the impact of electric vehicle deployment on power generation and CO2 emissions. The value of this evaluation is in the employment of a large-scale, bottom-up, national energy modeling system that encompasses the complex relationships of producing, transforming, transmitting and supplying energy to meet the useful demand characteristics with great technological detail. One of such models employed in this analysis is the BUEMS model. The BUEMS model provides evidence of win-win policy options that lead to profitable decarbonization using Turkey{\textquoteright}s data in BUEMS. Specifically, the result shows that a ban on diesel fueled vehicles reduces lifetime emissions as well as lifetime costs. Furthermore, model results highlight the cost-effective emission reduction potential of e-buses in urban transportation. More insights from the results indicate that the marginal cost of emission reduction through e-bus transportation is much lower than that through other policy measures such as carbon taxation in transport. This paper highlights the crucial role the electricity sector plays in the sustainability of e-mobility and the value of related policy prescriptions.

}, issn = {1996-1073}, doi = {10.3390/en13164042}, url = {https://www.mdpi.com/1996-1073/13/16/4042}, author = {G{\"u}rkan Kumbaro{\u g}lu and Canaz, Cansu and Deason, Jonathan and Shittu, Ekundayo} } @article {1456, title = {Statistical inference using stratified judgment post-stratified samples from finite populations}, journal = {Environmental and Ecological Statistics}, volume = {27}, year = {2020}, pages = {73{\textendash}94}, author = {Ozturk, Omer and K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak} } @article {1433, title = {A column generation heuristic for {VMAT} planning with adaptive {CVaR} constraints}, journal = {Physics in Medicine {\&} Biology}, volume = {64}, year = {2019}, month = {oct}, pages = {205024}, abstract = {

In this study we develop an efficient computational procedure that generates medically acceptable treatment plans for volumetric modulated arc therapy with constant gantry speed. Our proposed method is a column generation heuristic based on a mixed integer linear programming model, where the objective function contains minimization of total monitor unit of the treatment plan and dose-volume requirements are included as conditional value-at-risk constraints. Our heuristic generates a full treatment arc for the restricted master problem and calibrates the right hand side parameters of the conditional value-at-risk constraints in the first phase. In the second phase, this initial solution is improved by performing column generation. This is a fully automated procedure and produces treatment plans in a single call without any human intervention. We evaluate its performance on real prostate cancer data by comparing the quality of the generated plans with those obtained by a widely used commercial treatment planning system. Our analysis shows that the results are promising, and the generated plans satisfy the prescription restrictions and require fewer monitor units on average compared to the ones obtained using Eclipse.

}, doi = {10.1088/1361-6560/ab416e}, url = {https://doi.org/10.1088/1361-6560/ab416e}, author = {P{\i}nar Dursun and Z C Ta{\c s}k{\i}n and I. Kuban Altinel and Hatice Bilge and Nazmiye D{\"o}nmez Kesen and Murat Okutan and Ethem Nezih Oral} } @article {1430, title = {Optimization{\textendash}based decoding algorithms for LDPC convolutional codes in communication systems}, journal = {IISE Transactions}, volume = {51}, year = {2019}, pages = {1061-1074}, abstract = {

AbstractIn a digital communication system, information is sent from one place to another over a noisy communication channel. It may be possible to detect and correct errors that occur during the transmission if one encodes the original information by adding redundant bits. Low{\textendash}Density Parity{\textendash}Check (LDPC) convolutional codes, a member of the LDPC code family, encode the original information to improve error correction capability. In practice these codes are used to decode very long information sequences, where the information arrives in subsequent packets over time, such as video streams. We consider the problem of decoding the received information with minimum error from an optimization point of view and investigate integer programming{\textendash}based exact and heuristic decoding algorithms for its solution. In particular, we consider relax{\textendash}and{\textendash}fix heuristics that decode information in small windows. Computational results indicate that our approaches identify near{\textendash}optimal solutions significantly faster than a commercial solver in high channel error rates. Our proposed algorithms can find higher quality solutions compared with the state of the art iterative decoding heuristic.

}, doi = {10.1080/24725854.2018.1550692}, url = {https://doi.org/10.1080/24725854.2018.1550692}, author = {Banu Kabakulak and Z C Ta{\c s}k{\i}n and Ali Emre Pusane} } @article {1443, title = {Determining the most vulnerable components in a transportation network}, journal = {Sigma}, volume = {9}, year = {2018}, pages = {371{\textendash}382}, author = {K{\"u}{\c c}{\"u}kayd{\i}n, Hande and Necati Aras} } @article {1474, title = {Impacts of Regulatory Transformation Processes to the Downstream Oil Market in Turkey}, journal = {International Journal of Energy Economics and Policy}, volume = {8}, year = {2018}, pages = {141{\textendash}149}, issn = {2146-4553}, author = {Metin, Erol and G{\"u}rkan Kumbaro{\u g}lu} } @article {1457, title = {Model based inference using ranked set samples}, journal = {Survey Methodology}, volume = {44}, year = {2018}, month = {Jun}, pages = {1{\textendash}16}, issn = {0714-0045}, author = {Ozturk, Omer and K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak} } @article {1475, title = {Substitution elasticities in an energy-augmented CES production function An empirical analysis for Turkey}, journal = {Journal of Economics and Political Economy}, volume = {5}, year = {2018}, month = {Jun}, pages = {234{\textendash}249}, issn = {2148-8347}, author = {K{\"u}{\c c}{\"u}k, Merve and G{\"u}rkan Kumbaro{\u g}lu and SARICA, KEMAL} } @inbook {1186, title = {Bilevel Models on the Competitive Facility Location Problem}, booktitle = {Spatial Interaction Models}, year = {2017}, pages = {1{\textendash}19}, publisher = {Springer}, organization = {Springer}, author = {Necati Aras and K{\"u}{\c c}{\"u}kayd{\i}n, Hande} } @proceedings {1181, title = {The Impact of Orbit Dependent Return Rate on the Control Policies of a Hybrid Production System}, journal = {11th SMMSO Conference }, year = {2017}, author = {Aybek Korugan and S. Ata and M. Fad{\i}lo{\u g}lu} } @article {1166, title = {Karbon Vergisi ile Sera Gaz{\i} Emisyonlar{\i}n{\i}n Azalt{\i}m{\i}: Turkiye Vakas{\i}.}, journal = {International Relations/Uluslararasi Iliskiler}, volume = {14}, year = {2017}, author = {G{\"u}rkan Kumbaro{\u g}lu and {\.I}lhan Or and I{\c S}IK, Mine} } @article {1163, title = {Optimal sensor deployment to increase the security of the maximal breach path in border surveillance}, journal = {European Journal of Operational Research}, volume = {259}, year = {2017}, pages = {19{\textendash}36}, author = {Karabulut, Ezgi and Necati Aras and I. Kuban Altinel} } @article {1458, title = {Reliability and mean residual life functions of coherent systems in an active redundancy}, journal = {Naval Research Logistics (NRL)}, volume = {64}, year = {2017}, pages = {19-28}, abstract = {

Abstract In this article, the reliability and the mean residual life (MRL) functions of a system with active redundancies at the component and system levels are investigated. In active redundancy at the component level, the original and redundant components are working together and lifetime of the system is determined by the maximum of lifetime of the original components and their spares. In the active redundancy at the system level, the system has a spare, and the original and redundant systems work together. The lifetime of such a system is then the maximum of lifetimes of the system and its spare. The lifetimes of the original component and the spare are assumed to be dependent random variables. {\textcopyright} 2017 Wiley Periodicals, Inc. Naval Research Logistics, 64: 19{\textendash}28, 2017

}, keywords = {active redundancy, bivarite order statistics, coherent system, MRL functions, reliability function}, doi = {https://doi.org/10.1002/nav.21729}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/nav.21729}, author = {K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak} } @article {1466, title = {INVESTIGATING THE POTENTIAL OF STATE-TRUNCATIONAPPROXIMATIONS FOR PRODUCTION LINES}, journal = {Stochastic Modelling and Applications}, volume = {20}, year = {2016}, month = {Dec}, pages = {91{\textendash}109}, author = {Durmu{\c s}, Deniz and YERALAN, SENCER and Aybek Korugan} } @article {1462, title = {The mean wasted life time of a component of system}, journal = {Journal of Computational and Applied Mathematics}, volume = {305}, year = {2016}, month = {Oct}, pages = {44{\textendash}54}, issn = {03770427}, author = {K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak} } @article {1176, title = {Regional opportunities for China to go low-carbon: results from the REEC model}, journal = {The Energy Journal}, volume = {37}, year = {2016}, author = {Duan, Hongbo and Zhu, Lei and G{\"u}rkan Kumbaro{\u g}lu and Fan, Ying and others} } @article {1467, title = {Locating recycling facilities for IT based electronic waste in Turkey}, journal = {Journal of Cleaner Production}, volume = {105}, year = {2015}, month = {Oct}, pages = {324{\textendash}336}, issn = {09596526}, author = {Necati Aras and Aybek Korugan and B{\"U}Y{\"U}K{\"O}ZKAN FEYZ{\.I}O{\u G}LU, G{\"U}L{\c C}{\.I}N and S{\.I}VR{\.I}KAYA {\c S}ER{\.I}FO{\u G}LU, FUNDA and Erol, Ismail and Nurtani{\c s} Velio{\u g}lu, Meltem} } @article {1468, title = {An Adaptive CONWIP Mechanism for Hybrid Production Systems}, journal = {International Journal of Advanced Manufacturing Technology}, volume = {74}, year = {2014}, pages = {715{\textendash}727}, author = {Aybek Korugan and Gupta, Surendra M} } @article {1460, title = {Baker- Lin-Huang Type Bivariate Distributions Based on Order Statistics}, journal = {Communications in Statistics - Theory and Methods}, volume = {43}, year = {2014}, pages = {1992-2006}, abstract = {

Baker (2008) introduced a new class of bivariate distributions based on distributions of order statistics from two independent samples of size n. Lin and Huang (2010) discovered an important property of Baker{\textquoteright}s distribution and showed that the Pearson{\textquoteright}s correlation coefficient for this distribution converges to maximum attainable value, i.e., the correlation coefficient of the Fr{\'e}chet upper bound, as n increases to infinity. Bairamov and Bayramoglu (2013) investigated a new class of bivariate distributions constructed by using Baker{\textquoteright}s model and distributions of order statistics from dependent random variables, allowing higher correlation than that of Baker{\textquoteright}s distribution. In this article, a new class of Baker{\textquoteright}s type bivariate distributions with high correlation are constructed based on distributions of order statistics by using an arbitrary continuous copula instead of the product copula.

}, doi = {10.1080/03610926.2013.775301}, url = {https://doi.org/10.1080/03610926.2013.775301}, author = {K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak and I. Bayramoglu (Bairamov)} } @article {1459, title = {On Censored Bivariate Random Variables: Copula, Characterization, and Estimation}, journal = {Communications in Statistics - Simulation and Computation}, volume = {43}, year = {2014}, pages = {2173-2185}, abstract = {

{ Let (X, Y) be a bivariate random vector with joint distribution function FX, Y(x, y) = C(F(x), G(y)), where C is a copula and F and G are marginal distributions of X and Y, respectively. Suppose that (Xi, Yi)

}, doi = {10.1080/03610918.2012.748911}, url = {https://doi.org/10.1080/03610918.2012.748911}, author = {K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak and Ismihan Bayramoglu (bairamov)} } @article {1461, title = {Life behavior of shock models for uniformly distributed interarrival times}, journal = {Statistical Papers}, volume = {55}, year = {2014}, month = {Aug}, pages = {841{\textendash}852}, issn = {0932-5026}, author = {ERYILMAZ, SERKAN and K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak} } @article {1463, title = {Univariate Interval Censoring with Two Random Intervals}, journal = {Social Sciences Research Journal}, volume = {3}, year = {2014}, month = {Sep}, pages = {1{\textendash}4}, issn = {2147-5237}, author = {K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak} } @article {keskin2014wireless, title = {Wireless sensor network lifetime maximization by optimal sensor deployment, activity scheduling, data routing and sink mobility}, journal = {Ad Hoc Networks}, volume = {17}, year = {2014}, pages = {18{\textendash}36}, publisher = {Elsevier}, author = {Keskin, M Emre and I. Kuban Altinel and Necati Aras and Ersoy, Cem} } @inbook {Yucel2013a, title = {The actor-option framework: a general framework for modelling socio-technical systems in transitions}, booktitle = {Infranomics: Sustainability, Engineering Design and Governance}, series = {Topics in Safety, Risk, Reliability and Quality}, volume = {24}, year = {2013}, pages = {407{\textendash}418}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, address = {Cham}, keywords = {modelling, simulation, socio-technical transitions}, isbn = {978-3-319-02492-9}, doi = {10.1007/978-3-319-02493-6}, url = {http://link.springer.com/10.1007/978-3-319-02493-6}, author = {G{\"o}nen{\c c} Y{\"u}cel}, editor = {Gheorghe, Adrian V. and Masera, Marcelo and Katina, Polinpapilinho F.} } @article {1464, title = {From the Huang Kotz FGM distribution to Baker s bivariate distribution}, journal = {Journal of Multivariate Analysis}, volume = {113}, year = {2013}, month = {Jan}, pages = {106{\textendash}115}, issn = {0047259X}, author = {BAYRAMO{\u G}LU, {\.I}SM{\.I}HAN and K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak} } @article {1470, title = {On the quality variation impact of returns in remanufacturing}, journal = {Computers \& Industrial Engineering}, volume = {64}, year = {2013}, month = {Apr}, pages = {929{\textendash}936}, issn = {03608352}, author = {Aybek Korugan and Dinge{\c c}, Kemal Din{\c c}er and {\"O}nen, Tolga and Ate{\c s}, N{\"u}fer Y} } @article {1469, title = {A stochastic analysis of asynchronous demand in disassembly processes of remanufacturing systems}, journal = {European Journal of Industrial Engineering}, volume = {7}, year = {2013}, pages = {175{\textendash}205}, author = {Dinge{\c c} , Kemal Din{\c c}er and Aybek Korugan} } @inbook {ekcsiouglu2013user, title = {A user experience study of airline websites}, booktitle = {Design, User Experience, and Usability. Web, Mobile, and Product Design}, year = {2013}, pages = {173{\textendash}182}, publisher = {Springer Berlin Heidelberg}, organization = {Springer Berlin Heidelberg}, author = {Mahmut Ek{\c s}io{\u g}lu and Kiris, Esin and \cCak{\i}r, Tu{\u g}ba and G{\"u}vendik, Merve and Koyut{\"u}rk, Efsane D and Y{\i}lmaz, Merve} } @article {kucukaydin2012ciftduzeyli, title = {Ciftduzeyli Bir Rekabetci Tesis Yer Secimi Problemi Icin Tabu Arama Sezgiseli}, journal = {Endustri Muhendisligi Dergisi}, volume = {23}, number = {1}, year = {2012}, publisher = {TMMOB Makina Muhendisleri Odasi}, author = {K{\"u}{\c c}{\"u}kayd{\i}n, Hande and Necati Aras and I. Kuban Altinel} } @article {1477, title = {Evaluation of economically optimal retrofit investment options for energy savings in buildings}, journal = {Energy and Buildings}, volume = {49}, year = {2012}, pages = {327-334}, abstract = {

In this study, a techno-economic evaluation method for the energy retrofit of buildings is introduced, geared toward finding the economically optimal set of retrofit measures. Split incentives of building owners and users are considered explicitly in a conventional (static) evaluation to identify the investment alternatives maximizing the net present value (NPV). Energy price uncertainty for various distributional assumptions of the stochastic variables is addressed through Monte Carlo simulation. Results from the simulation are used to compute probabilities and expected NPVs. Based on this, a sequential (dynamic) evaluation method is developed, featuring a real options investment appraisal. The real options approach is introduced as an advancement in the practice of economic evaluation of building retrofit investment options. The new method is applied to an office building in Germany, illustrating its performance. The case study results indicate that energy price changes significantly affect the profitability of retrofit investments, and that high price volatility creates a substantial value of waiting, making it more rational to postpone the investment.

}, keywords = {Building energy efficiency, Energy conservation, Net present value, Real options}, issn = {0378-7788}, doi = {https://doi.org/10.1016/j.enbuild.2012.02.022}, url = {https://www.sciencedirect.com/science/article/pii/S0378778812000990}, author = {G{\"u}rkan Kumbaro{\u g}lu and Reinhard Madlener} } @article {Kwakkel2012, title = {An Exploratory Analysis of the Dutch Electricity System in Transition}, journal = {Journal of the Knowledge Economy}, year = {2012}, pages = {1{\textendash}16}, publisher = {Springer US}, abstract = {

Recent contextual developments constitute a backdrop of change for the Dutch electricity system. Institutional change driven by liberalization, changing economic competitiveness of the dominant fuels, new technologies, and changing end-user preferences regarding electricity supply are some exam- ples of these developments. This paper explores plausible transition trajectories in the face of these developments given technological uncertainty about invest- ment and operating costs, and fuel efficiency of various alternative technolo- gies; political uncertainty about future CO2 abatement policies such as emission trading; and socio-economic uncertainty about fuel prices, investment decisions of suppliers, and load curves. Various alternative developments for these uncertainties are specified. The consequences of each of these alternative developments are assessed using an agent-based model of the Dutch electricity system. The outputs are analyzed using various data-mining and data visualization techniques in order to reveal arch-typical transition trajectories and their conditions for occurring. Policy recommendations are derived from this. The results indicate that most transition trajectories point towards a future energy supply system that is reliant on clean coal and gas. Under the explored uncertainties, only rarely a transition to renewables occurs. The various sustainable energy support programs appear to be ineffective in steering the energy supply system towards a more sustainable mode of functioning across the various uncertainties.

}, keywords = {Electricity supply, Exploratory model, Transitions}, issn = {1868-7865}, doi = {10.1007/s13132-012-0128-1}, url = {http://dx.doi.org/10.1007/s13132-012-0128-1}, author = {Kwakkel, Jan and G{\"o}nen{\c c} Y{\"u}cel} } @conference {kucukaydin2012hybrid, title = {Hybrid Tabu Search Heuristics for a Bilevel Competitive Facility Location Model}, booktitle = {26th Annual Conference of the Belgian Operational Research Society}, year = {2012}, author = {K{\"u}{\c c}{\"u}kayd{\i}n, Hande and Necati Aras and I. Kuban Altinel} } @article {keccici2012incorporating, title = {Incorporating the threat of terrorist attacks in the design of public service facility networks}, journal = {Optimization Letters}, volume = {6}, number = {6}, year = {2012}, pages = {1101{\textendash}1121}, publisher = {Springer-Verlag}, author = {Ke{\c c}ici, Serhat and Necati Aras and Verter, Vedat} } @article {kuccukaydin2012leader, title = {A leader{\textendash}follower game in competitive facility location}, journal = {Computers \& Operations Research}, volume = {39}, number = {2}, year = {2012}, pages = {437{\textendash}448}, publisher = {Elsevier}, author = {K{\"u}{\c c}{\"u}kayd{\i}n, Hande and Necati Aras and I. Kuban Altinel} } @article {kocsucuouglu2012material, title = {Material handling considerations in the FMS loading problem with full routing flexibility}, journal = {International Journal of Production Research}, volume = {50}, number = {22}, year = {2012}, pages = {6530{\textendash}6552}, publisher = {Taylor \& Francis}, author = {Ko{\c s}ucuo{\u g}lu, Deniz and {\"U}mit Bilge} } @article {1476, title = {Modeling and analysis of a decentralized electricity market: An integrated simulation/optimization approach}, journal = {Energy}, volume = {44}, year = {2012}, pages = {830-852}, abstract = {

In this study, a model is developed to investigate the implications of an hourly day-ahead competitive power market on generator profits, electricity prices, availability and supply security. An integrated simulation/optimization approach is employed integrating a multi-agent simulation model with two alternative optimization models. The simulation model represents interactions between power generator, system operator, power user and power transmitter agents while the network flow optimization model oversees and optimizes the electricity flows, dispatches generators based on two alternative approaches used in the modeling of the underlying transmission network: a linear minimum cost network flow model and a non-linear alternating current optimal power flow model. Supply, demand, transmission, capacity and other technological constraints are thereby enforced. The transmission network, on which the scenario analyses are carried out, includes 30 bus, 41 lines, 9 generators, and 21 power users. The scenarios examined in the analysis cover various settings of transmission line capacities/fees, and hourly learning algorithms. Results provide insight into key behavioral and structural aspects of a decentralized electricity market under network constraints and reveal the importance of using an AC network instead of a simplified linear network flow approach.

}, keywords = {Alternative current optimum power flow, Electricity market modeling and design, Minimum cost network flow, Multi-agent simulation}, issn = {0360-5442}, doi = {https://doi.org/10.1016/j.energy.2012.05.009}, url = {https://www.sciencedirect.com/science/article/pii/S036054421200388X}, author = {Kemal Sar{\i}ca and G{\"u}rkan Kumbaro{\u g}lu and {\.I}lhan Or} } @article {1465, title = {Residual Lifetime of Consecutive $k$-out-of- $n$ Systems Under Double Monitoring}, journal = {IEEE Transactions on Reliability}, volume = {61}, year = {2012}, pages = {792-797}, doi = {10.1109/TR.2012.2206272}, author = {ERYILMAZ, SERKAN and K{\"o}n{\"u}l Bayramo{\u g}lu Kavlak} } @article {14445765, title = {{Competitive facility location problem with attractiveness adjustment of the follower: A bilevel programming model and its solution}}, journal = {European Journal of Operational Research}, volume = {208}, year = {2011}, pages = {206{\textendash}220}, doi = {10.1016/j.ejor.2010.08.009}, author = {Hande K{\"u}{\c c}{\"u}kaydin and Necati Aras and I. Kuban Altinel} } @article {kuccukaydin2011discrete, title = {A discrete competitive facility location model with variable attractiveness}, journal = {Journal of the Operational Research Society}, volume = {62}, number = {9}, year = {2011}, pages = {1726{\textendash}1741}, publisher = {Nature Publishing Group}, author = {K{\"u}{\c c}{\"u}kayd{\i}n, H and Necati Aras and I. Kuban Altinel} } @inbook {ekcsiouglu2011heuristic, title = {Heuristic evaluation and usability testing: case study}, booktitle = {Internationalization, Design and Global Development}, year = {2011}, pages = {143{\textendash}151}, publisher = {Springer Berlin Heidelberg}, organization = {Springer Berlin Heidelberg}, author = {Mahmut Ek{\c s}io{\u g}lu and Kiris, Esin and \cCapar, Burak and Sel{\c c}uk, Murat N and Ouzeir, Selen} } @article {keskin2011lifetime, title = {Lifetime maximization in wireless sensor networks using a mobile sink with nonzero traveling time}, journal = {The Computer Journal}, year = {2011}, pages = {bxr048}, publisher = {Oxford University Press}, author = {Keskin, M Emre and I. Kuban Altinel and Necati Aras and Ersoy, Cem} } @article {1479, title = {A sectoral decomposition analysis of Turkish CO2 emissions over 1990{\textendash}2007}, journal = {Energy}, volume = {36}, year = {2011}, pages = {2419-2433}, abstract = {

At a time of increased international concern and negotiations for greenhouse gas emission reduction, country studies on the underlying effects of greenhouse gas emission growth gain importance. The case of Turkey is particularly interesting due to rapidly growing emissions, accompanied by a political will and actions to reduce the quick growth. The refined Laspeyres method is used in this study to identify factors\ that accelerate or reduce the increase in Turkish CO2 emissions. A year-by-year decomposition over 1990{\textendash}2007 is carried out at sectoral level based on disaggregated data that is consistent over time and consistent with international standards. Various interesting results on the underlying effects of sectoral emission growth are found. Valuable insights are gained into CO2 impacts of sectoral policies including energy and emission intensities, fuel switching and activity changes. The results yield important hints for the planning of energy and climate policy.

}, keywords = {Carbon intensity, CO decomposition, Energy intensity, Sectoral emissions, Turkey}, issn = {0360-5442}, doi = {https://doi.org/10.1016/j.energy.2011.01.027}, url = {https://www.sciencedirect.com/science/article/pii/S0360544211000284}, author = {G{\"u}rkan Kumbaro{\u g}lu} } @article {1478, title = {What determines urban households{\textquoteright} willingness to pay for CO2 emission reductions in Turkey: A contingent valuation survey}, journal = {Energy Policy}, volume = {39}, year = {2011}, pages = {689-698}, abstract = {

This paper explores Turkish urban households{\textquoteright} willingness to pay (WTP) for CO2 emission reductions expected to result from improvements in power production. A face-to-face questionnaire, with a Contingent valuation (CV) module prepared using the double-bounded dichotomous choice elicitation framework, was administered to 2422 respondents representative of urban Turkey{\textemdash}a developing country with low but rapidly increasing greenhouse gas emissions. The determinants of WTP were identified by considering not only the impact of standard socio-economic factors but also the effects of environmental knowledge, attitudes and behaviour, the relevance of the identity of the collection agent (national versus international institutions) in terms of trust people have towards them, and the degree of perceived participation of others in the realization of the project. Our study confirms the existing literature in demonstrating that WTP figures reported by young and educated people that are active on environmental issues, and who also possess material security and environmental knowledge, are more likely to be high. However, their willingness to make contributions is hampered significantly by their belief that their fellow citizens will not contribute and the general lack of trust in institutions. Overall, this study may be taken as a call to eliminate governance-related uncertainties in climate change deals.

}, keywords = {Climate change, Contingent valuation, Turkey}, issn = {0301-4215}, doi = {https://doi.org/10.1016/j.enpol.2010.10.042}, url = {https://www.sciencedirect.com/science/article/pii/S0301421510007937}, author = {Fikret Adaman and Nihan Karal{\i} and G{\"u}rkan Kumbaro{\u g}lu and {\.I}lhan Or and Beg{\"u}m {\"O}zkaynak and {\"U}nal Zenginobuz} } @article {erol2010exploring, title = {Exploring reverse supply chain management practices in Turkey}, journal = {Supply Chain Management: An International Journal}, volume = {15}, number = {1}, year = {2010}, pages = {43{\textendash}54}, publisher = {Emerald Group Publishing Limited}, author = {Erol, Ismail and Velioglu, Meltem Nurtanis and Serifoglu, Funda Sivrikaya and B{\"u}y{\"u}k{\"o}zkan, G{\"u}l{\c c}in and Necati Aras and Cakar, Nigar Demircan and Aybek Korugan} } @book {13986675, title = {{A Hybrid Tabu Search Heuristic for a Bilevel Competitive Facility Location Model}}, series = {Hybrid Metaheuristics}, year = {2010}, pages = {31{\textendash}45}, doi = {10.1007/978-3-642-16054-7_3}, author = {Hande K{\"u}{\c c}{\"u}kaydin and Necati Aras and I. Kuban Altinel} } @article {aksen2009design, title = {Design and analysis of government subsidized collection systems for incentive-dependent returns}, journal = {International Journal of Production Economics}, volume = {119}, number = {2}, year = {2009}, pages = {308{\textendash}327}, publisher = {Elsevier}, author = {Aksen, Deniz and Necati Aras and Karaarslan, Ay{\c s}e G{\"o}n{\"u}l} } @article {1471, title = {Performance analysis of a hybrid system under quality impact of returns}, journal = {Computers \& Industrial Engineering}, volume = {56}, year = {2009}, month = {Mar}, pages = {507{\textendash}520}, issn = {03608352}, author = {Behret, H{\"u}lya and Aybek Korugan} } @article {cherng2009vibration, title = {Vibration reduction of pneumatic percussive rivet tools: mechanical and ergonomic re-design approaches}, journal = {Applied ergonomics}, volume = {40}, number = {2}, year = {2009}, pages = {256{\textendash}266}, publisher = {Elsevier}, author = {Cherng, John G and Mahmut Ek{\c s}io{\u g}lu and K{\i}z{\i}laslan, Kemal} } @article {1480, title = {CO2, GDP and RET: An aggregate economic equilibrium analysis for Turkey}, journal = {Energy Policy}, volume = {36}, year = {2008}, pages = {2694-2708}, abstract = {

There is a worldwide interest in renewable electricity technologies (RETs) due to growing concerns about global warming and climate change. As an EU candidate country whose energy demand increases exponentially, Turkey inevitably shares this common interest on RET. This study, using an aggregate economic equilibrium model, explores the economic costs of different policy measures to mitigate CO2 emissions in Turkey. The model combines energy demands, capital requirements and labor inputs at a constant elasticity of substitution under an economy-wide nested production function. Growing energy demand, triggered by economic growth, is met by increased supply and initiates new capacity additions. Investment into RET is encouraged via the incorporation of (a) endogenous technological learning through which the RET cost declines as a function of cumulative capacity, and (b) a willingness to pay (WTP) function which imposes the WTP of consumers as a lower bound on RET installation. The WTP equation is obtained as a function of consumer income categories, based on data gathered from a pilot survey in which the contingent valuation methodology was employed. The impacts of various emission reduction scenarios on GDP growth and RET diffusion are explored. As expected, RET penetration is accelerated under faster technological learning and higher WTP conditions. It is found that stabilizing CO2 emissions to year 2005 levels causes economic losses amounting to 17\% and 23\% of GDP in the years 2020 and 2030, respectively.

}, keywords = {Energy and environmental policy modeling, Learning (experience) curves, Willingness to pay for CO emission reduction}, issn = {0301-4215}, doi = {https://doi.org/10.1016/j.enpol.2008.03.026}, url = {https://www.sciencedirect.com/science/article/pii/S030142150800164X}, author = {G{\"u}rkan Kumbaro{\u g}lu and Nihan Karal{\i} and Y{\i}ld{\i}z Ar{\i}kan} } @proceedings {nisa4, title = {A Dynamic Simulation Model of Academic Publications and Citations}, journal = {26th International Conference of the System Dynamics Society}, year = {2008}, author = {K{\"u}{\c c}{\"u}k, B. and Nisa {\"O}nsel and B. Eskici} } @article {FBE-IE-02-2008-02, title = {Measurement, Analysis and Evaluation of Academic Publications and Citations}, number = {FBE-IE-02/2008-02}, year = {2008}, institution = {Bo{\u g}azi{\c c}i University}, author = {Yaman Barlas and B. K{\"u}{\c c}{\"u}k and Nisa {\"O}nsel and A. S. Kocaman} } @article {kayics2008note, title = {A note on the can-order policy for the two-item stochastic joint-replenishment problem}, journal = {IIE Transactions}, volume = {40}, number = {1}, year = {2008}, pages = {84{\textendash}92}, publisher = {Taylor \& Francis}, author = {Kayi{\c s}, Enis and Taner Bilgi{\c c} and Karabulut, Deniz} } @article {1481, title = {A real options evaluation model for the diffusion prospects of new renewable power generation technologies}, journal = {Energy Economics}, volume = {30}, year = {2008}, pages = {1882-1908}, abstract = {

This study presents a policy planning model that integrates learning curve information on renewable power generation technologies into a dynamic programming formulation featuring real options analysis. The model recursively evaluates a set of investment alternatives on a year-by-year basis, thereby taking into account that the flexibility to delay an irreversible investment expenditure can profoundly affect the diffusion prospects of renewable power generation technologies. Price uncertainty is introduced through stochastic processes for the average wholesale price of electricity and for input fuel prices. Demand for electricity is assumed to be increasingly price-sensitive, as the electricity market deregulation proceeds, reflecting new options of consumers to react to electricity price changes (such as time-of-use pricing, unbundled electricity services, and choice of supplier). The empirical analysis is based on data for the Turkish electricity supply industry. Apart from general implications for policy-making, it provides some interesting insights about the impact of uncertainty and technical change on the diffusion of various emerging renewable energy technologies.

}, keywords = {Dynamic programming, Investment planning, Learning curve, Real options, Renewable energy technology diffusion, Turkey}, issn = {0140-9883}, doi = {https://doi.org/10.1016/j.eneco.2006.10.009}, url = {https://www.sciencedirect.com/science/article/pii/S0140988306001241}, author = {G{\"u}rkan Kumbaro{\u g}lu and Reinhard Madlener and Mustafa Demirel} } @article {eksioglu2008steering, title = {Steering-wheel grip force characteristics of drivers as a function of gender, speed, and road condition}, journal = {International journal of industrial ergonomics}, volume = {38}, number = {3}, year = {2008}, pages = {354{\textendash}361}, publisher = {Elsevier}, author = {Mahmut Ek{\c s}io{\u g}lu and K{\i}z{\i}laslan, Kemal} } @conference {ekcsiouglu2007automobile, title = {Automobile drivers{\textquoteright} steering force characteristics}, booktitle = {Proceedings of 37th International Conference on Computers and Industrial Engineering}, number = {590-594}, year = {2007}, author = {Mahmut Ek{\c s}io{\u g}lu and K{\i}z{\i}laslan, Kemaal} } @article {bilge2007tabu, title = {A tabu search algorithm for the single machine total weighted tardiness problem}, journal = {European Journal of Operational Research}, volume = {176}, number = {3}, year = {2007}, pages = {1423{\textendash}1435}, publisher = {Elsevier}, author = {{\"U}mit Bilge and Kurtulan, M{\"u}jde and K{\i}ra{\c c}, Furkan} } @proceedings {kizilaslaneffects, title = {EFFECTS OF FREQUENCY, GRIP FORCE, AND GENDER ON THE PERCEPTION OF STEERING WHEEL LONGITUDINAL VIBRATION}, year = {2006}, author = {K{\i}z{\i}laslan, Kemal and Mahmut Ek{\c s}io{\u g}lu and Amman, Scott A} } @article {1482, title = {Modeling Technology Adoption as an Irreversible Investment under Uncertainty the Case of the Turkish Electricity Supply Industry}, journal = {Energy Economics}, volume = {27}, year = {2005}, month = {Jan}, pages = {139{\textendash}163}, author = {Madlener, Reinhard and G{\"u}rkan Kumbaro{\u g}lu and ED{\.I}GER, {\c S}EVKET VOLKAN} } @article {eksioglu20042, title = {A 2-D Biomechanical Analysis of Microgravity Induced Neutral Body Posture in one-g Environment}, journal = {IIE Annual Conference. Proceedings}, year = {2004}, pages = {1}, publisher = {Institute of Industrial Engineers-Publisher}, author = {Mahmut Ek{\c s}io{\u g}lu and K{\i}z{\i}laslan, Kemal} } @conference {ekcsiouglu20042, title = {A 2-D biomechanical analysis of zero-gravity neutral posture in one-g environment}, booktitle = {Proceedings of 13th IIE Annual Conference (CD- ROM)}, year = {2004}, author = {Mahmut Ek{\c s}io{\u g}lu and K{\i}z{\i}laslan, Kemal} } @article {bilge2004tabu, title = {A tabu search algorithm for parallel machine total tardiness problem}, journal = {Computers \& Operations Research}, volume = {31}, number = {3}, year = {2004}, pages = {397{\textendash}414}, publisher = {Elsevier}, author = {{\"U}mit Bilge and K{\i}ra{\c c}, Furkan and Kurtulan, M{\"u}jde and Pekg{\"u}n, Pelin} } @article {1484, title = {Energy and Climate Policy Analysis with the Hybrid Bottom Up Computable General Equilibrium Model SCREEN The Case of the Swiss CO2 Act}, journal = {Annals of Operations Research}, volume = {121}, year = {2003}, month = {Jul}, pages = {181{\textendash}203}, author = {G{\"u}rkan Kumbaro{\u g}lu and Madlener, Reinhard} } @article {1483, title = {Environmental Taxation and Economic Effects A Computable General Equilibrium Analysis for Turkey}, journal = {Journal of Policy Modeling}, volume = {25}, year = {2003}, month = {Nov}, pages = {795{\textendash}810}, author = {G{\"u}rkan Kumbaro{\u g}lu} } @article {1485, title = {Endogenising emission taxes: A general equilibrium type optimisation model applied for Turkey}, journal = {Energy Policy}, volume = {29}, year = {2001}, pages = {1045-1056}, abstract = {

This paper presents a modelling attempt to endogenise the level and timing of environmental taxes within an optimisation framework. First, a base model of energy{\textendash}economy{\textendash}environmental interactions is extended to allow for exogenous tax analysis. Two types of environmental taxes, one on the sulphur content of fuels and the other on the level of emissions, are exogenously included in the model as alternative instruments to mitigate pollution. Next, the base model is modified to endogenise pollution abatement. This has been achieved by incorporating a preference rate, depending on an index of emissions, into the utility function. Finally, the emission index and emission tax are taken as substitutes and modelled within a CES form to endogenise the emission tax. Results for all cases, obtained with Turkish data, are discussed. It is found that a tax on SO2 emissions is more effective in reducing SO2 emissions than a tax applied on the sulphur content of fuels. It is also found that a gradually increasing tax is more effective in reducing emissions than a constant tax.

}, keywords = {Emission taxation, Endogenous pollution abatement, Energy{\textendash}economy modelling}, issn = {0301-4215}, doi = {https://doi.org/10.1016/S0301-4215(01)00032-5}, url = {https://www.sciencedirect.com/science/article/pii/S0301421501000325}, author = {Y{\i}ld{\i}z Ar{\i}kan and G{\"u}rkan Kumbaro{\u g}lu} } @article {1472, title = {A multi echelon inventory system with returns}, journal = {Computers \& Industrial Engineering}, volume = {35}, year = {1998}, month = {Oct}, pages = {145{\textendash}148}, issn = {03608352}, author = {Aybek Korugan and Gupta, Surendra M} } @article {1486, title = {A model for long-term air quality prediciton and development of efficient control strategies in Turkey}, journal = {EUROPEAN JOURNAL OF OPERATIONAL RESEARCH}, volume = {102}, year = {1997}, month = {Oct}, pages = {380{\textendash}392}, issn = {0377-2217}, author = {G{\"u}rkan Kumbaro{\u g}lu} } @article {1489, title = {Rescheduling on a single machine with part type dependent setup times and deadlines}, journal = {Annals of Operations Research}, volume = {70}, year = {1997}, month = {Jan}, pages = {93{\textendash}113}, issn = {02545330}, author = {Ali Tamer {\"U}nal and Uzsoy, Reha and Kiran, Ali} } @conference {Hauser;Hoermann;Kunst;Lenneis:1994a, title = {A note on generation, estimation and prediction of stationary processes}, booktitle = {Compstat, Proceedings in Computational Statistics}, year = {1994}, pages = {323{\textendash}328}, publisher = {Physica-Verlag}, organization = {Physica-Verlag}, address = {Heidelberg}, author = {Hauser, M.A. and Wolfgang H{\"o}rmann and Kunst, R.M. and Lenneis, J.} } @article {1490, title = {A probabilistic cost-based due date assignment model for job shops}, journal = {International Journal of Production Research}, volume = {31}, year = {1993}, pages = {2817-2834}, abstract = {

Abstract In this paper, a cost-based due date assignment methodology is proposed. The method uses two pre-specified parameters: an estimate of the job flow time and the probability of the job being tardy. An optimization model is presented to find the best tardiness probability of the job based on a total cost function involving the work-in-process inventory and the tardiness costs. Using the results of the correlation analysis performed on a wide set of shop, job and job{\textquoteright}s route related variables, ten models are constructed to estimate the flow time of a job in the shop. The models are then compared based on the simplicity of the model and the standard deviation of the estimate errors. One of the models is recommended and tested to check if it can be used in different shop scenarios. As a result, it is observed that the model performs satisfactorily in all the shop conditions considered in this study.

}, doi = {10.1080/00207549308956902}, url = {https://doi.org/10.1080/00207549308956902}, author = {A. C. KAPLAN and Ali Tamer {\"U}nal} } @article {1492, title = {BATCH SEQUENCING}, journal = {IIE Transactions}, volume = {24}, year = {1992}, pages = {73-83}, abstract = {

Consider the single machine scheduling problem where there are a number of part types to be processed. A part type is defined as follows: Two parts are of the same part type if the machine does not require a setup in between the processing of these parts. The problem investigated in this paper is to find a sequence of batches of parts (if there are any) where all the requirements for parts are met. A heuristic and an exact algorithm are developed, and computational analysis is performed to measure the performance of the heuristic. The time complexity function of the heuristic is O(n2), and the exact algorithm runs in polynomial time given a fixed upper bound on the number of setups.

}, doi = {10.1080/07408179208964235}, url = {https://doi.org/10.1080/07408179208964235}, author = {Ali Tamer {\"U}nal and Ali S. Kiran} } @article {1491, title = {A location problem on unicyclic networks: Balanced case}, journal = {European Journal of Operational Research}, volume = {62}, year = {1992}, pages = {194-202}, abstract = {

The problem of locating n stations on a unicyclic unidirectional network is considered. We formulated the problem as an integer program for the case of a balanced flow matrix, i.e., the total inflow to a station equals the total outflow from that station. The integer programming formulation reduces the problem to a station sequencing problem regardless of the actual station locations on the network. Furthermore, the empirical evidence suggests that the LP solutions to the relaxed IP formulations are optimal.

}, issn = {0377-2217}, doi = {https://doi.org/10.1016/0377-2217(92)90247-7}, url = {https://www.sciencedirect.com/science/article/pii/0377221792902477}, author = {Ali S. Kiran and Ali Tamer {\"U}nal and Selcuk Karabati} }