Browsing by Publisher "Elsevier BV"
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Item An analysis method in project management using primal-dual relationships(Elsevier BV, 1998) Gümüsoglu S.; Tütek H.In the analysis of network models, project evaluation and review technique (PERT) and critical path method (CPM) are the methods which have been widely applied to industrial project planning and control in practice. PERT which is a large scale model, analyzes the project using a standard forward - backward analysis method. Further, quantitative models have been developed for shortening total project time by determining appropriate activities for crashing with a minimum cost. In this study; to solve the project planning and control problems, a new method of analysis is introduced with the help of the LP model using primal - dual relationships. This method, tested on middle scale problems has proved to be more efficient in terms of mathematical calculations than traditional PERT - CPM solutions, simplex solutions to LP formulation and Out-of-Kilter method. The method of analysis proposed has been applied to a holiday village project with a 370 bed capacity. The result is a minimum cost program with the total project time of 10 months. © 1998 Elsevier Science Ltd and IPMA. All rights reserved.Item Time domain dynamic analysis of piles under impact loading(Elsevier BV, 2002) Küçükarslan S.In this paper, time domain dynamic analysis of piles under impact loading is presented. For this purpose a hybrid boundary element technique is implemented. Linear beam column finite elements are used to model the piles and resulting governing equations are solved using an implicit integration scheme. The continuum is assumed to be elastic and an efficient step-by-step time integration scheme is implemented by using an approximate half space integral formulation. By enforcing displacement equilibrium conditions at each time step, a system of equations is generated which yields the solution. Results of this time domain formulation under linear material behavior are compared with Laplace domain results to validate the methods. © 2002 Elsevier Science Ltd. All rights reserved.Item Inelastic analysis of pile soil structure interaction(Elsevier BV, 2003) Küçükarslan S.; Banerjee P.K.; Bildik N.In this paper, inelastic pile soil structure interaction is analyzed by using a hybrid type of numerical method. Piles and structural elements are modeled as linear finite elements and soil half space is modeled by using boundary elements. Inelastic modeling of soil media is presented by introducing a rational approximation to continuum with nonlinear interface springs along the piles. For this purpose, modified Özdemir's nonlinear model is implemented and systems of equations are coupled for piles and pile groups at interacting nodes. To verify the proposed algorithm, four experimental results from previously conducted tests under static loads are compared with those obtained from present analysis. © 2003 Elsevier Science Ltd. All rights reserved.Item Behavior of axially loaded pile group under lateral cyclic loading(Elsevier BV, 2003) Küçükarslan S.; Banerjee P.K.In this paper, a hybrid boundary element technique is implemented to analyze behavior of axially loaded pile group under lateral cycling loading. Nonlinear material behavior of soil is introduced by a rational approximation to continuum with nonlinear interface springs along the piles. Linear beam column finite elements are used to model the piles. By enforcing displacement and equilibrium conditions at each increment, a system of equations is generated which yields the solution. A numerical study to verify the proposed model is performed. To investigate the cyclic behavior three groups are loaded (1×2, 2×3, and 3×3 groups) initially half of the ultimate axial load, then a lateral loading is applied for cyclic behavior of piles, is done to investigate the behavior of pile groups. © 2002 Elsevier Science Ltd. All rights reserved.Item Musculoskleletal manifestations of generalized lipodystrophy(Elsevier BV, 2005) Örgüç Ş.; Pabuşçu Y.; Işlak S.; Özmen B.The lipoatrophic-lipodystrophic syndromes are a heterogeneous group of adipose tissue disorders characterized by selective and progressive loss of fat from various parts of the body. Affected patients have acantosis nigricans, corneal opacities, mental retardation, hirsutism and accelerated growth and maturation. We report the musculoskeletal findings of a case of acquired lipodystrophy with symmetrical involvement of appendicular skeleton. Although more than 500 cases with various types of lipodistrophy have been reported there is little emphasis on the musculoskeletal manifestations. © 2004 Elsevier Ireland Ltd. All rights reserved.