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무선 멀티 서비스 WCDMA 네트워크에서의 형평성을 고려한 하향링크 서비스 수락 설계
노상현(Sanghyun Noh),김동우(Dongwoo Kim) 한국정보과학회 2003 정보과학회논문지 : 정보통신 Vol.30 No.1
본 논문에서는 멀티 서비스 WCDMA 이동 시스템을 위한 새로운 서비스 품질 예측 지표를 사용함으로써 사용자들의 QoS 요구치를 고려한 순방향 서비스 수락 기준을 제안한다. 제안된 순방향 서비스 수락 기준은 상대적인 외부 셀의 간섭을 가정하고 각 서비스의 평균 수신 전력을 계산함으로써 얻어진다. 제안한 방법을 이용하여 우리는 서로 다른 서비스의 사용자들이 허용될 수 있는 순방향 서비스 수락 영역을 얻는다. 그리고 제안한 순방향 서비스 수락 기준에 형평성을 고려하여 각각의 서비스를 사용하는 사용자들을 위한 또 다른 순방향 서비스 수락 기준을 제시한다. 수치적 예에서 음성 서비스와 데이타 서비스들의 형평성을 고려한 순방향 서비스 수락 영역과 형평성을 고려하지 않은 순방향 서비스 수락 영역은 제안된 각각의 순방향 서비스 수락 기준들을 이용하여 얻을 수 있다. In this paper, we propose a downlink service admission strategy that considers users QoS requirements by using a novel service quality prediction index for multi-service WCDMA mobile systems. The proposed downlink service admission strategy is obtained by computing average received power of each service, assuming a relative other-cell interference factor. With the proposed method we obtain a downlink service admission region where users of different services properly can be admitted. And adding the fairness at the proposed downlink service admission strategy, we propose another downlink service admission strategy. In the numerical examples, the downlink service admission region with fairness and the downlink service admission region without fairness of voice service and data services are obtained by proposed downlink service admission strategies, respectively.
노상현(Sang-Hyun Noh),이상규(Sang-Gyu Lee),박운환(Un-Hwan Park),임윤규(Yeun-Kyu Lim) 한국산업융합학회 2000 한국산업융합학회 논문집 Vol.3 No.2
Fuzzy control is proposed to regulate cutting force in turning operations under varying cutting conditions. The traditional linear controllers based on crisp mathematical model cannot effectively control cutting force becasue of the nonlinear dynamics of turning operations. The proposed fuzzy controller is based on operator experience and expert knowledge. The membership functions for the inputs and the output of the controller are designed. Cutting force is regulated by adjusting feedrate according to the variation of cutting conditions. The performance of the proposed controller is evaluated by experiments. The results of experiments show that the proposed fuzzy controller has a good cutting force regulation over a wide range of cutting conditions.<br/> <br/> <br/>
노상현(Sang-Hyun Noh),임윤규(Yoon-Kyu Lim) 한국산업융합학회 1999 한국산업융합학회 논문집 Vol.2 No.1
Also the fuzzy control rules are separately acquired with the loading and unloading situation of the crane for more accurate control. And We designed controller by fuzzy learning method, and then compare fuzzy learning method with LQR. The result of simulations shows that the crane is controlled better than LQR for a very large swing angle of 1 radian within nearly one cycle.<br/>
디지털 IIR 필터를 이용한 입력성형기법에 의한 2축 천정크레인의 진동제어
노상현(Sang-Hyun Noh),박운환(Un-Hwan Park) 한국산업융합학회 1999 한국산업융합학회 논문집 Vol.2 No.1
Input shaping technique has been used as a simple method of controlling vibration. With the conventional methods previously proposed by several authors, the frequency range that shows a good performance is restricted. When the designed frequency being different from the natural frequency of a system. the performance of control degrades remarkably, This paper introduced a new technique that uses digital IIR filter to control vibration. This technique has robustness for changing of parameter. In order to prove this we applied input shaping method to 2 axial overhead crane.<br/> <br/>
히트파이프를 이용한 구동모터에 대한 냉각기술에 관한 연구
노상현(Sang-Hyun Noh),이동렬(Dong-Ryul Lee) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
This research is to verify the cooling effect of the acting surface on the rotary motor using heat pipe and conventional cooling fan. In order to show the cooling performance of the rotary motor and heat pipe with the fin-typed heat sink, the surface temperature of the motor and condenser was measured in real time. The experiments were also conducted as for not only cooling device installed with heat pipe only, but with heat pipe and conventional cooling fan simultaneously.