Browsing by Subject "Planning"
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Item Open Access 3D forest fire propagation simulation(IEEE, 2008-05) Köse, Kıvanç; Grammalidis, N.; Yılmaz, E.; Çetin, A. EnisThe increase in the number of forest fires in the last few years dispatch governments to take precautions. Besides prevention, early intervention is also very important in fire fighting. If the firefighters know where the fire will be in some time, it would be easier for them to stop the fire. Therefore a big need for simulating the fire behavior exists. In this paper we are proposing a system which can simulate the propagation of fire in time. Also this system can visualize the propagation of fire in any 3D-GIS environment, that accepts KMZ as a file format. Besides, any user demanded data can be visualized on the map of the system. This gives the chance of fire planning to firefighters. The system can visualize its results on 3D screens in 3D. Therefore, a better understanding of the terrain can be obtained. ©2008 IEEE.Item Restricted Ankara metrosu: planlama, inşaat ve başlama süreci(Bilkent University, 2023) Nadirler, Ahmet Utku; Tuğcu, Bilgehan; Uzun, Cansu Naz; Czichon, Cem Paul; Tanoğlu, Fatma NurBu araştırmanın konusu Ankara Metrosunun inşaat sürecinin incelenmesidir. Metronun planlanması, inşaatta kullanılan yöntemler, alınan güvenlik önlemleri ve metronun kullanıma açılması ile toplumda yarattığı etkiler incelenmiştir. Metronun ulaşımda sağladığı kolaylıklar ve ne kadar önemli olduğunu kanıtlama amacı doğrultusunda araştırma yapılmıştır. Araştırma yapılırken kullanılan makalelerin, tez yazılarının ve gazetelerin yanı sıra daha kesin bilgilere ulaşabilmek için o yıllarda M1 hattının yapımında çalışmış bir inşaat mühendisi olan Yalçın Uzun’dan da yardım aldık.Item Open Access Automated web services composition with the event calculus(Springer, 2007-10) Aydın, Onur; Kesim-Çiçekli, Nihan; Çiçekli, İlyasAs the web services proliferate and complicate it is becoming an overwhelming job to manually prepare the web service compositions which describe the communication and integration between web services. This paper analyzes the usage of the Event Calculus, which is one of the logical action-effect definition languages, for the automated preparation and execution of web service compositions. In this context, abductive planning capabilities of the Event Calculus are utilized. It is shown that composite process definitions in OWL-S can be translated into Event Calculus axioms so that planning with generic process definitions is possible within this framework. © 2008 Springer-Verlag Berlin Heidelberg.Item Restricted DSİ Genel Müdür Yardımcısı: Ahmet Fuat Ünver(Bilkent University, 2020) Al, Ezgi; Cenik, Gökçe; Çün, Bora; Eren, Çağrı; Gürkan, Zeynep GözeAhmet Fuat Ünver 1933 doğumlu inşaat mühendisi, Devlet Su İşleri Genel Müdürlüğü'nün eski genel müdür yardımcısı ve Devlet Su İşleri Vakfı'nın kurucu üyesidir. İstanbul Teknik Üniversitesi İnşaat Mühendisliği Bölümü'nden mezun olmuş ve mezuniyetinden emekliliğine kadar, 40 yıl boyunca DSİ'de çalışarak Türkiye'nin çeşitli yerlerinde su işleriyle ilgili planlamalar ve idari işlerle ilgilenmiştir. Baraj inşaası, içme suyu ve taşkın projeleri gibi önemli altyapı çalışma alanlarında görev almıştır. Güneydoğu Anadolu Projesi'ne, Süleyman Demirel ile birlikte adını vermiş ve GAP'ın bir enerji projesi olduğunun altını çizmiştir. Şu anda 88 yaşında olan Ünver, ailesiyle birlikte Ankara'da yaşamaktadır.Item Open Access Dynamic financial planning: certainty equivalents, stochastic constraints and functional conjugate duality(Taylor & Francis, 2005) Jefferson, T. R.; Scott, C. H.This paper studies portfolios under risk and stochastic constraints. Certainty equivalents combine risk aversion and exponential utility to form the objective. Budget and stochastic constraints on the account balance are used to ensure a positive net worth over time. These portfolio models are analyzed by functional conjugate duality for general distributions and by conjugate duality for the normal distribution. All the programs are convex. The duals provide insight into this approach and relate it to other stochastic and financial concepts.Item Open Access Dynamic lot sizing problem for a warm/cold process(Taylor & Francis, 2006) Toy, A. Ö.; Berk, E.We consider a dynamic lot sizing problem with finite capacity for a process that can be kept warm until the next production period at a unit variable cost ωt only if more than a threshold value has been produced and is cold, otherwise. That is, the setup cost in period t is Kt if xt-1 < Qt-1 and kt, otherwise (0 ≤ kt ≤ Kt). We develop a dynamic programming formulation of the problem, establish theoretical results on the structure of the optimal production plan and discuss its computational complexity in the presence of Wagner-Whitin-type cost structures. Based on our stuctural results, we present an optimal polynomial-time solution algorithm for kt = 0, and also show that an optimal linear-time solution algorithm exists for a special case. Our numerical study indicates that utilizing the undertime option (i.e., keeping the process warm via reduced production rates) results in significant cost savings, which has managerial implications for capacity planning and selection.Item Open Access An equipment replacement problem with dynamic production planning and capacity considerations(Taylor & Francis, 1996) Gill, A.; Adil, G. K.; Bector, C. R.In this paper, we propose a 0-1 integer programming formulation for an equipment replacement problem in which the demand of a product varies from period to period and different types of equipment with different production capacities are available. Since all the variables involved in the model are restricted to have binary values, the model is fairly efficient and hence can be used for large-sized problems. The use of the model is demonstrated with the help of some numerical examples.Item Open Access Formalization of the traffic world in the C action language(Bilkent University, 2000) Erdoğan, Selim T.Reasoning about actions and effects of actions is an important task in Artifical Intelligence, with connections to knowledge representation and planning. Many formal methods for representing actions and inferring their effects have been developed over the years (e.g. action languages, fluent calculus, situation calculus). Howewer, the examples formalized so far have been "toy" domains of very small sizes. Successful formalizations of scenarios of nontrivial size are needed in order to show that these methods are suitable for real applications and to assess the strong and weak sides of different methods. The C action language is a logic programming language designed to represent the effects of actions on fluents. In this thesis we formalize the TRAFFIC scenario world - a domain of moderate size, specified at the Logic Modelling Workshop at http://www.ida.liu.se/ext/etai/lmw/ - using the C action language. Example planning problems using the formalization are successfully solved using the Causal Calculator - available at http://www.cs.utexas.edu/users/tag/cc/ -, a program for planning and querying in action domains. The formalization is contrasted with previous work on the TRAFFIC world, namely the formalization of A. Henschel and M. Thielscher using the fluent calculus.Item Open Access A hierarchical model for the cell loading problem of cellular manufacturing systems(Taylor & Francis, 1998) Aktürk, M. S.; Wilson, G. R.A hierarchical cell loading approach is proposed to solve the production planning problem in cellular manufacturing systems. Our aim is to minimize the variable cost of production subject to production and inventory balance constraints for families and items, and capacity feasibility constraints for group technology cells and resources over the planning horizon. The computational results indicated that the proposed algorithm was very efficient in finding an optimum solution for a set of randomly generated problems.Item Open Access Minisum and maximin aerial surveillance over disjoint rectangles(Springer Verlag, 2016) Karasakal, OrhanThe aerial surveillance problem (ASP) is finding the shortest path for an aerial surveillance platform that has to visit each rectangular area once and conduct a search in strips to cover the area at an acceptable level of efficiency and turn back to the base from which it starts. In this study, we propose a new formulation for ASP with salient features. The proposed formulation that is based on the travelling salesman problem enables more efficient use of search platforms and solutions to realistic problems in reasonable time. We also present a max–min version of ASP that maximizes the minimum probability of target detection given the maximum flight distance of an aerial platform. We provide computational results that demonstrate features of the proposed models.Item Open Access Modelling detailed information flows in building design with the parameter-based design structure matrix(Elsevier, 2006-01) Tasli Pektas, S.; Pultar M.The Architecture/Engineering/Construction (AEC) industry is one of the multidisciplinary domains in which collaboration among related parties is of utmost importance. Despite the intense flow of information between design professionals, there is a lack of research to better understand and manipulate these flows. Most of the current process modelling tools in the AEC industry do not enable analyses of iterative information cycles. Moreover, these tools represent the process at high levels, thus, they are inadequate for multi-parameter problems like building design. With a view to alleviate these problems, this paper introduces the use of parameter-based design structure matrix as a process modelling and system analysis tool for building design. The method reveals insights into the process structure, optimum sequence of parameter decisions, iterative cycles and concurrency in the process. The application of the method is demonstrated through a case study on suspended ceiling design in a real-life project.Item Open Access A multiperiod capital budgeting problem: the ten-year acquisition program of the Turkish Armed Forces(Bilkent University, 2000) Yavuz, SerdarStructuring the Ten-year Acquisition Program of the Turkish Armed Forces is a critical problem faced during the defense planning process. This is essentially a resource allocation process. Since the decisions have long-term impacts on the defense capability of the Turkish Armed Forces, it is a high-priority concern of the top decision makers. In this study, a binary integer programming model is proposed which will aid the decision makers in their formulation of the acquisition process. This model determines which projects to select as well as the years at which they should be started. Viability of the model is shown by means of representative computational runs.Item Open Access New heuristic for the dynamic layout problem(Palgrave Macmillan, 2003) Erel, E.; Ghosh, J. B.; Simon, J. T.The dynamic layout problem addresses the situation where the traffic among the various units within a facility changes over time. Its objective is to determine a layout for each period in a planning horizon such that the total of the flow and the relocation costs is minimized. The problem is computationally very hard and has begun to receive attention only recently. In this paper, we present a new heuristic scheme, based on the idea of viable layouts, which is easy to operationalize. A limited computational study shows that, depending upon how it is implemented, this scheme can be reasonably fast and can yield results that are competitive with those from other available solution methods.Item Open Access Optimal timing of project control points(Elsevier, 2000) Raz, T.; Erel, E.The project control cycle consists of measuring the status of the project, comparing to the plan, analysis of the deviations, and implementing any appropriate corrective actions. We present an analytical framework for determining the optimal timing of project control points throughout the life cycle of the project. Our approach is based on maximizing the amount of information generated by the control points, which depends on the intensity of the activities carried out since the last control point and on the time elapsed since their execution. The optimization problem is solved with a dynamic programming approach. We report the results of numerical experimentation with the model involving different types of activity intensity profiles and several levels of information loss. For each combination, we compared the optimal amount of information to the amount of information obtained with two simpler policies: control at equal time intervals, and control at equal activity contents intervals. We also investigated the effect of adding more control points on the amount of information generated.Item Open Access Organization development and performance improvement planning: a case study of STFA ENERCOM(Bilkent University, 1991) Düzgün, AlevOrganization Development is a guidance of the Performance Improvement Planning Method, which is widely used to operationalize organizational change. The fundemental assumption of this study is that the Process Consultation Technique is an effective means to facilitate organization development and increase performance. This thesis first presents a literature survey followed by an analysis of a case study conducted at STFA ENERCOM.Item Open Access Reactive footstep planning for a planar spring mass hopper(IEEE, 2009-10) Arslan, Ömür; Saranlı, Uluç; Morgül, ÖmerThe main driving force behind research on legged robots has always been their potential for high performance locomotion on rough terrain and the outdoors. Nevertheless, most existing control algorithms for such robots either make rigid assumptions about their environments (e.g flat ground), or rely on kinematic planning at low speeds. Moreover, the traditional separation of planning from control often has negative impact on the robustness of the system against model uncertainty and environment noise. In this paper, we introduce a new method for dynamic, fully reactive footstep planning for a simplified planar spring-mass hopper, a frequently used model for running behaviors. Our approach is based on a careful characterization of the model dynamics and an associated deadbeat controller, used within a sequential composition framework. This yields a purely reactive controller with a very large, nearly global domain of attraction that requires no explicit replanning during execution. Finally, we use a simplified hopper in simulation to illustrate the performance of the planner under different rough terrain scenarios and show that it is extremely robust to both model uncertainty and measurement noise. © 2009 IEEE.Item Restricted Şehir planlamadan sosyal bilimlere İlhan Tekeli’nin hayatı(Bilkent University, 2024) Aydınkaş, Elif; Tosun, Şenay; Erdoğmuş, Mehmet Konuralp; Özmen, Meryem; Varol, BeyzaBu çalışmada Türkiye'de şehir ve bölge planlama disiplinlerinin gelişimine önemli katkılarda bulunan Prof. Dr. İlhan Tekeli'nin erken yaşamından başlayarak akademik kariyerine, değerli çalışmalarına ve katıldığı projelere geniş bir perspektiften bakılacaktır. İlhan Tekeli şehir ve bölge planlama alanında Türkiye'de ve uluslararası düzeyde önemli akademik katkılarıyla beraber çalışmalarının tarih, ekonomi ve politika gibi çeşitli disiplinler arası perspektif içermesi ve sosyal bilimler alanına olan geniş katkılarıyla değerli bir akademisyendir. Genel olarak, bu çalışmada İlhan Tekeli'nin akademik ve profesyonel hayatı üzerine kapsamlı bir inceleme yapılacak ve hayatı, çalışmaları ve düşünceleri aktarılacaktır.Item Open Access Urban development process of built environments in metropolitan areas in Turkey: case study of angora settlement, Ankara(American Society of Civil Engineers, 2012) Balta, M. T.; Tekel, A; Tekel, H. T.The built environments of metropolitan areas are rapidly changing in response to urban development dynamics. The nature of the urban built environment continues to be influenced by the conflicting interests and expectations of various entities involved in the process of development planning and implementation. The formulation and implementation of urban development plans in Turkey is guided by the statutory provisions of the country's planning system. This process has led to piecemeal implementation through partial plans and plan amendments in metropolitan areas. This article attempts to determine how the private sector in metropoles in Turkey shaped the built environment in Turkey after 1980. Influence of neo-liberal policies and a partial planning approach set by a free-market economy instead of a comprehensive planning approach shaped urban space. As a capital, the urban development of Ankara has mostly been shaped by partial planning approaches and implementations and uncontrolled developments, especially on the southwest axis of the city's metropolitan area. For this reason, one of the largest settlement of southwest Ankara is the Angora Settlement, which has been selected as the case study. Examining the entities who play a part in the urban development process is important to control its consequences. In this article, the case of Angora Settlement is used to question the planning process and entities in the development of urban built environments, and studies this settlement to identify and question which entities determine the components of the built environment in the urban development process. In particular, this paper captures the dominance of the structural interests of the private sector in shaping Angora's land use pattern, which is important because it reveals the uncontrolled growth dynamics in developing countries. © 2012 American Society of Civil Engineers.