The Experts below are selected from a list of 41880 Experts worldwide ranked by ideXlab platform
J. A. Kavicky - One of the best experts on this subject based on the ideXlab platform.
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A subarea-level transaction simulation framework supporting Parallel Paths and energy tagging
IEEE Transactions on Power Systems, 2000Co-Authors: J. A. Kavicky, S.m. ShahidehpourAbstract:A methodology is proposed to improve transaction modeling for electrical systems, and associated expense estimation, by applying a transmission constraint data reduction technique and a novel transmission model formulation. A linear programming model is described, which represents Parallel flows and manages transaction tagging and accounting to improve model optimality and treatment of nonlinear phenomena. The modeling framework is a large-scale approach that provides screening results to initiate detailed small-scale investigations. The methodology also supplements the flow-based transmission modeling philosophy currently under consideration by the North American Electric Reliability Council (NERC). The proposed method extends the NERC utility-level model to a subarea-level network model to improve overall transmission modeling detail and performance. In addition, the model merges an optimizing technique with the Parallel Path and energy tagging features into one homogeneous model.
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Characterizing and modeling subarea-level energy transactions.
1998Co-Authors: J. A. KavickyAbstract:This paper describes the application of an electrical network characterization method to an optimization model that is designed to simulate subarea-level energy transactions. The network characterization method determines subarea clusters of system buses that electrically respond to perturbations in a very similar manner. The method produces a reduced number of transmission constraints and preserves Parallel Path representations. The least-cost, linear programming (LP) formulation takes advantage of data reduction techniques to simplify model transmission constraints, while supporting Parallel Path system characteristics and energy tagging of subarea transactions. An overview of the proposed method describes the problem domain and key model features. The paper then presents two model applications that illustrate generator siting and line overload screening analyses.
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Parallel Path aspects of transmission modeling
1996Co-Authors: J. A. Kavicky, S.m. ShahidehpourAbstract:This paper examines the present methods and modeling techniques available to address the effects of Parallel flows resulting from various firm and short-term energy transactions. A survey of significant methodologies is conducted to determine the present status of Parallel flow transaction modeling. The strengths and weaknesses of these approaches are identified to suggest areas of further modeling improvements. The motivating force behind this research is to improve transfer capability assessment accuracy by suggesting a real-time modeling environment that adequately represents the influences of Parallel flows while recognizing operational constraints and objectives.
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Parallel Path aspects of transmission modeling
IEEE Transactions on Power Systems, 1996Co-Authors: J. A. Kavicky, S.m. ShahidehpourAbstract:This paper examines the present methods and power system modeling techniques available to address the effects of Parallel load flows resulting from various firm and short-term energy transactions. A survey of significant methodologies is conducted to determine the present status of Parallel flow transaction modeling. The strengths and weaknesses of these approaches are identified to suggest areas of further modeling improvements. The motivating force behind this research is to improve transmission system transfer capability assessment accuracy by suggesting a real-time modeling environment that adequately represents the influences of Parallel flows while recognizing operational constraints and objectives.
S.m. Shahidehpour - One of the best experts on this subject based on the ideXlab platform.
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A subarea-level transaction simulation framework supporting Parallel Paths and energy tagging
IEEE Transactions on Power Systems, 2000Co-Authors: J. A. Kavicky, S.m. ShahidehpourAbstract:A methodology is proposed to improve transaction modeling for electrical systems, and associated expense estimation, by applying a transmission constraint data reduction technique and a novel transmission model formulation. A linear programming model is described, which represents Parallel flows and manages transaction tagging and accounting to improve model optimality and treatment of nonlinear phenomena. The modeling framework is a large-scale approach that provides screening results to initiate detailed small-scale investigations. The methodology also supplements the flow-based transmission modeling philosophy currently under consideration by the North American Electric Reliability Council (NERC). The proposed method extends the NERC utility-level model to a subarea-level network model to improve overall transmission modeling detail and performance. In addition, the model merges an optimizing technique with the Parallel Path and energy tagging features into one homogeneous model.
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Parallel Path aspects of transmission modeling
1996Co-Authors: J. A. Kavicky, S.m. ShahidehpourAbstract:This paper examines the present methods and modeling techniques available to address the effects of Parallel flows resulting from various firm and short-term energy transactions. A survey of significant methodologies is conducted to determine the present status of Parallel flow transaction modeling. The strengths and weaknesses of these approaches are identified to suggest areas of further modeling improvements. The motivating force behind this research is to improve transfer capability assessment accuracy by suggesting a real-time modeling environment that adequately represents the influences of Parallel flows while recognizing operational constraints and objectives.
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Parallel Path aspects of transmission modeling
IEEE Transactions on Power Systems, 1996Co-Authors: J. A. Kavicky, S.m. ShahidehpourAbstract:This paper examines the present methods and power system modeling techniques available to address the effects of Parallel load flows resulting from various firm and short-term energy transactions. A survey of significant methodologies is conducted to determine the present status of Parallel flow transaction modeling. The strengths and weaknesses of these approaches are identified to suggest areas of further modeling improvements. The motivating force behind this research is to improve transmission system transfer capability assessment accuracy by suggesting a real-time modeling environment that adequately represents the influences of Parallel flows while recognizing operational constraints and objectives.
Marcia Lei Zeng - One of the best experts on this subject based on the ideXlab platform.
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domain specific markup languages and descriptive metadata their functions in scientific resource discovery
Pesquisa Brasileira em Ciência da Informação e Biblioteconomia, 2012Co-Authors: Marcia Lei ZengAbstract:While metadata has been a strong focus within information professionals‟ publications, projects, and initiatives during the last two decades, a significant number of domain-specific markup languages have also been developing on a Parallel Path at the same rate as metadata standards; yet, they do not receive comparable attention. This essay discusses the functions of these two kinds of approaches in scientific resource discovery and points out their potential complementary roles through appropriate interoperability approaches. link para o texto completo: www.periodicos.ufsc.br/index.php/eb/article/view/16890/15768
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domain specific markup languages and descriptive metadata their functions in scientific resource discovery
Encontros Bibli: Revista Eletrônica de Biblioteconomia e Ciência da Informação, 2010Co-Authors: Marcia Lei ZengAbstract:While metadata has been a strong focus within information professionals’ publications, projects, and initiatives during the last two decades, a significant number of domain-specific markup languages have also been developing on a Parallel Path at the same rate as metadata standards; yet, they do not receive comparable attention. This essay discusses the functions of these two kinds of approaches in scientific resource discovery and points out their potential complementary roles through appropriate interoperability approaches. http://dx.doi.org/10.5007/1518-2924.2010v15nesp2p164 While metadata has been a strong focus within information professionals’ publications, projects, and initiatives during the last two decades, a significant number of domain-specific markup languages have also been developing on a Parallel Path at the same rate as metadata standards; yet, they do not receive comparable attention. This essay discusses the functions of these two kinds of approaches in scientific resource discovery and points out their potential complementary roles through appropriate interoperability approaches.
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domain specific markup languages and descriptive metadata their functions in scientific resource discovery linguagens de marcacao especificas por dominio e metadados descritivos funcoes para a descoberta de recursos cientificos
2010Co-Authors: Marcia Lei ZengAbstract:While metadata has been a strong focus within information professionals‟ publications, projects, and initiatives during the last two decades, a significant number of domain-specific markup languages have also been developing on a Parallel Path at the same rate as metadata standards; yet, they do not receive comparable attention. This essay discusses the functions of these two kinds of approaches in scientific resource discovery and points out their potential complementary roles through appropriate interoperability approaches.
Hyun-chul Kim - One of the best experts on this subject based on the ideXlab platform.
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Tool Path generation for contour Parallel milling with incomplete mesh model
The International Journal of Advanced Manufacturing Technology, 2010Co-Authors: Hyun-chul KimAbstract:In this paper, a tool Path generation method for contour Parallel milling based on an incomplete two-manifold mesh model, namely, an inexact polyhedron which is widely used in recent commercialized computer-aided manufacturing software systems is presented. The method consists of three major steps: machining area detection, 2D offset, and Path linking. Machining areas obtained from a mesh model are closed 2D lines. Thus, offsetting closed lines is essential to generate mesh-based contour Parallel tool Path. For contour Parallel Path elements, a new offset algorithm for closed 2D lines with islands is introduced and the result is illustrated. The main point of the proposed algorithm is that every point is set to be an offset using bisectors, and then invalid offset lines, which are not to be participated in offsets, are detected in advance and handled with an invalid offset edge handling algorithm in order to generate raw offset lines without local invalid loops. As a result, the proposed offset method is proved to be robust and simple, moreover, has a near O ( n ) time complexity, where n denotes the number of input lines. The proposed algorithm has been implemented and tested with 2D lines of various shapes. Finally, contour Parallel Path is made through linking offset Path elements.
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Tool Path modification for optimized pocket milling
International Journal of Production Research, 2007Co-Authors: Hyun-chul KimAbstract:Many operations in CNC milling tasks are performed using pocket milling which has two main types of tool Path trajectories, contour Parallel Path and direction Parallel Path. Hence there have been a lot of works on geometrically efficient algorithms to generate tool Paths. Although the conventional tool Path obtained from geometric information has been successful to make a desirable shape, it seldom considers physical process concerns like cutting forces and chatters. In order to cope with these problems, an optimized tool Path, which maintains as constant MRR as possible in order to achieve constant cutting forces and to avoid chatter vibrations at all time, is introduced and the result is verified. Additional tool Path segments are appended to the basic tool Path obtained by geometric shape by using a pixel-based simulation technique. The algorithm has been implemented for two-dimensional contiguous end milling operations, and cutting tests are conducted by measuring spindle current, which reflects mach...
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An optimized contour Parallel tool Path for 2D milling with flat endmill
The International Journal of Advanced Manufacturing Technology, 2006Co-Authors: Hyun-chul Kim, Sung-gun Lee, Min-yang YangAbstract:Although the conventional contour Parallel tool Path obtained from geometric information has been successful in making desirable shapes, it seldom considers the physical process concerns like cutting forces and chatters. In this paper, an optimized contour Parallel Path, which maintains constant MRR (material removal rates) at all times, is introduced and the results are verified. The optimized tool Path is based on a conventional contour Parallel tool Path. Additional tool Path segments are appended to the basic tool Path in order to achieve constant cutting forces and to avoid chatter vibrations in the entire machining area. The algorithm has been implemented for two dimensional contiguous end milling operations with flat end mills, and cutting tests were conducted to verify the significance of the proposed method.
Linjun Tong - One of the best experts on this subject based on the ideXlab platform.
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Novel Path generation algorithm for high-speed pocket milling
International Journal of Production Research, 2013Co-Authors: Jiajia Liang, Yuguo Wang, Yongfeng Song, Linjun TongAbstract:A novel tool Path generation algorithm is presented for high-speed pocket milling. A spiral fashion polyline is obtained by linear interpolation which is offset from the pocket boundary. The control points are then inserted into the polyline under exponential regularisation. Finally, the smooth tool Path is generated via B-spline curve fitting. The tool Path generated through this method can be directly used by the machine controller with a NURBS interpolation function, which avoids the time-consuming computation of dividing them into many short line segments. Compared with conventional methods of direction-Parallel and contour-Parallel Path generation, the tool Paths obtained by this algorithm have less cutting force fluctuation because they are Cncontinuous, smooth and have no direction jump. The engineering applications proved that the presented method can not only save machining time over the conventional algorithm, but also can avoid solving time-consuming scalar elliptic partial differential equatio...
