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네트워크 대역폭 할당에 따른 전송률 응답특성을 구현해주는 모델링 기법
박종진,문영성 한국통신학회 2003 韓國通信學會論文誌 Vol.28 No.8B
네트워크의 QoS를 지원하기 위해서는 환경변화에 동적으로 대처할 수 있는 자원관리 시스템이 필요하며, 이를 위해 고전적인 제어기술 분야에 사용되는 적응적인 시스템을 도입할 수 있다. 제어기술의 적용을 위해서는 네트워크의 대역폭 할당에 따른 전송률 응답특성을 구현해주는 모델의 개발이 필수적이라고 할 수 있다. 본 연구에서는 두 가지 방식의 네트워크 모델을 제안하였다. 첫째는 "동적 시스템 모델"이며 다른 하나는 "통계학적 모델"이다. 동적 시스템 모델은 네트워크의 동적 특성을 고려하여 도입하였으며, 통계학적 모델은 측정된 전송량 데이터의 분포를 고려하여 도입하였다. 제시된 두 모델의 인자 결정을 위해 최적화 기법을 사용하였으며, 제시된 두 모델이 실제 네트워크의 동작과 유사함을 살펴보았다. Throughput response characteristics depending on the network bandwidth allocation need to be modeled to devise adaptive control mechanism to support QoS of the network. Thus, two models are proposed in this study. The first one is a dynamic system model and the other one is a stochastic model. The dynamic system model is developed to represent dynamic characteristics of the network and the stochastic model is developed to represent distribution of measured throughput data. An optimization technique is used for decision of proposed model's factor. The result confirms that the characteristics of proposed models are similar with actual network's characteristics.
박종진 한국분말야금학회 1997 한국분말재료학회지 (KPMI) Vol.4 No.3
In most of sintered metal powder compacts, the sintered density distribution is controlled to be as high and uniform as possible to ensure the required mechanical properties. In general, the density distribution in the compacts is not uniform and not easy to measure. In the present study, a method for measuring the density distribution was developed, based on the indentation force equation by which the hardness and the relative density were related. The indentation force equation, expressed as a function of strength constant, workhardening coefficient and relative density, was obtained by finite element analysis of rigid-ball indentation on sintered powder metal compacts. The present method was verified by comparing the predicted density distribution in the sintered Fe-0.5%C-2%Cu compacts with that obtained by experiments, in which the density distribution was directly measured by machining the compacts from the outer surface progressively.
朴鍾振 慶星大學校 1991 論文集 Vol.12 No.2
To study the forward and backward giant swings on the high bar, A top-class gymnast was used as the subject in the seoul olympic final individual competition. and his motion were filmed by a 16mm high speed camera at frame per second. I have reached following conclution by analyzing the film. For the backward giant swing ; In the first quadrant of movement the body is fully extended while it is hyperextened in the second quadrant. The body is extended again in the fourth quadrant. For the forward giant swing ; At the end of the first quadrant of the movement, the body is slightly hyperextened in order to support the subsequent leg swing. The flexion of the hips increases in the second quadrant, just before the start of the third quadrant while the velocity decreases again in the second half. After passing the horizontal line in the fourth quadrant, the arms exert a force pull on the bar, which provokes first an upward movement of the shoulders.