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정관수,이원오,유웅렬 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.4
The ideal forming theory[1], which has been developed as a direct design method, provides an optimization technique for forming processes undergoing plastic deformation. In the ideal flow, materials are prescribed to deform following the minimum plastic work path. Besides the general ideal forming theory[2,3], specific ideal forming theories for membrane sheet forming[4] as well as two-dimensional steady bulk forming[5-7] have been previously developed. In this work, the theory is extended for the non-steady bulk forming under the plane strain condition. In particular, kinematics to describe the deformation along the minimum plastic work path is successfully developed using the orthogonal convective coordinate system based on the characteristic method.
정관수 (사)디지털산업정보학회 2015 디지털산업정보학회논문지 Vol.11 No.3
Multipath routing technique is recognized as one of the effective approaches to improve the reliability of data forwarding. However, the traditional multipath routing focuses only on how many paths are needed to ensure a desired reliability. For this purpose, the protocols construct additional paths and thus cause significant energy consumption. These problems have motivated the study for the energy-efficient and reliable data forwarding. Thus, this paper proposes an energy-efficient concurrent multipath routing protocol with a small number of paths based on interaction between paths. The interaction between paths helps to reinforce the multipath reliability by making efficient use of resources. The protocol selects several nodes located in the radio overlapped area between a pair of paths as bridge nodes for the path-interaction. In order to operate the bridge node efficiently, when the transmission failure has detected by overhearing at each path, it performs recovery transmission to recover the path failure. Simulation results show that proposed protocol is superior to the existing multipath protocols in terms of energy consumption and delivery reliability.