This paper presents design and development of a simulator evaluates the performance of a hierarchical cellular system. The proposed hierarchical cellular simulator, consisting of macro, micro, and pico cells, applies the wrap-around technique to reduce

This paper considers a scheduling problem concerned with an assembly system where two components are first treated in their own parallel machines and then pulled to be assembled into a final product at a single assembly machine. The objective measure is t

본 논문은 무선개인통신(PCS) 환경에서 기존의 자원경매다중접속(RAMA) 방법이 가지고 있는 단점을 보완할 수 있는 새로운 자원경매다중접속방법(MRAMA)을 제안하기위한 것이다. 제안된 방법은 경매표 개념을 도입하여 슬럿 할당 주기 상에서 경매 슬럿(slot)을 낭비하는 단점을 보완할 수 있으며, 할당 주기마다 갱신되는 경매테이블을 재택하고 선점 및 비선접 우선순위규칙이 혼합된 방법을 활용함으로써 빠르고 유연하게 접속, 핸드오프, 자원할당이 가능해진다

In this paper, four-bar linkage mechanism for the knee joint is developed which is used in prosthetics. But unlike the prosthetics, the feature of this mechanism is that the instantaneous center of rotation of the four-bar linkages can be moved behind the ground reaction force vector so that it can be passively supported without any external power. In addition, this mechanism is developed similar to the structure of the human knee joint for eliminating the sense of heterogeneity of the wearer. In order to design the mechanism with these two objectives, optimization design process is done using the PIAnO tool and detailed design is carried out through optimized variable values. The developed mechanism is attached to the robot which can assist the hip and ankle joints. In order to verify the operation of the developed knee mechanism, an insole type sensor was attached to the shoes to compare data values before and after wearing the robot. Result data showed that wearer wearing the exoskeleton robot with the knee mechanism was the same value regardless of whether the heavy tool is loaded or not.