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퍼지 신경망을 이용한 ATM 망의 호 수락 제어 시스템의 설계
유재택(Yoo Jae Taek),김춘섭(Kim Choon Seop),김용우(Kim Yong Woo),김영한(Kim Young Han),이광형(Lee Kwang Hyung) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.8
In this paper, we proposed the FNCAC (fuzzy neural call admission control) scheme of the ATM networks which used the benefits of fuzzy logic controller and the learning abilities of the neural network to solve the call admission control problems. The new call in ATM networks is connected if QoS(quality of service) of the current calls is not affected due to the connection of a new call. The neural network CAC(call admission control) system is predictable system because the neural network is able to learn by the input/output pattern. We applied the fuzzy inference on the learning rate and momentum constant for improving the learning speed of the fuzzy neural network. The excellence of the proposed algorithm was verified using measurement of learning numbers in the traditional neural network method and fuzzy neural network method by simulation. We found that the learning speed of the FNCAC based on the fuzzy learning rules is 5 times faster than that of the CAC method based on the traditional neural network theory.
유재택(Yoo Jae Taek),김용우(Kim Yong Woo),이진이(Lee Jin Yi),이광형(Lee Kwang Hyung) 한국정보처리학회 1996 정보처리학회논문지 Vol.3 No.7
In this paper, we propose th fuzzy traffic control method in ABR service for the effective use of ATM link. This method, a modified version of EPRCA which is one of rate control methods in ABR service controls the values of the transmission rates of source by using the fuzzy traffic inference based on switch buffer size and buffer variate rate. For this method, we developed a model and algorithm of the fuzzy traffic control rules and a max-min inferencing method. We conducted a simulation and compared the link utilization of the fuzzy traffic control method with that of the EPRCA method. The results of the simulation indicated that, compared to EPRCA, the fuzzy traffic control method improves the link utilization by 2.3% in a normal distribution model and by 2.7% in the MMPP model of the source.
잡음제거 및 Threshold 갱신을 통한 영상보안감시용 움직임 검출 알고리즘의 개선
유재택 안양대학교 2001 논문집 Vol.20-21 No.-
원격 보안감시용 camera에서 움직임 검출을 효과적으로 수행하기 위하여 잡음제거 기법과 pixel threshold 갱신 기법을 제안하여 차영상 움직임검출 알고리즘을 개선하였다. 이 기법들을 동시에 적용함으로서 영상잡음에 대한 민감도를 해결하였다. 환경요소인 조명변화시 차영상 알고리즘은 움직임검출이 작동되나 이에 적응하기 위하여 움직임검출 보류와 기준 frame 갱신을 통해 조명 변화에 민감한 문제를 해결하였다. 제작된 장치의 실험을 통하여 개선된 알고리즘은 현격한 잡음 발생 억제와 제거 효과를 보였으며 조명변화에도 적응하는 것을 확인하였다. To generate motion detections effectively at remote security supervision cameras, motion detection algorithm using difference images is improved by our proposed noise cancellation technique and pixel threshold update technique. Applying both techniques altogether, the sensitivity to the image noises are much reduced. Since illumination variations cause motion detections with difference image method, deferment of detection and update of reference frame techniques are applied to avoid unnecessary detections. Our experimentation showed that the improved algorithm resulted in unequal noise reductions-and-cancellations and adaptation to illumination variations.
유재택 대한전자공학회 1996 CAD 및 VLSI 설계연구회지 Vol.5 No.1
VLSI chips suffer from exaggerated clock skew problems when the clock rate reaches several hundred MHz. To solve these problems, we, propose the use of counterflow-clocking in which the clocks are distributed in a direction opposite to the data flow direction by employing hack-propagating clock signals amplified b5 a chain of inverters. This paper introduces Counterflow-Clocked(C²) Pipelining and discusses its usefulness and limitations to build large and high speed VLSI chips. It also presents the design of an image compression chip set to implement subband vector quantization that can handle HDTV data rates with reasonable VLSI chip sizes, The major advantages of this new pipelining are: easier distribution of high speed clocks, shorter clock period due to the absence of global clock signals, natural use of dynamic latches, less internally generated noise due to uniformly distributed latch operations, etc. Composition methods were developed. The use of these methods enabled us to build a system with two-dimensional data-flow in C² pipelining employing a tree of inverter chains fer clock distribution. C² pipelining was used to design an IDTV chip set with several design innovations, demonstrating the applicability and viability of the technology.
유재택,이광형 崇實大學校 生産技術硏究所 1994 論文集 Vol.24 No.-
The packet communication protocol(X.25, TCP/IP etc.) was designed to ensure the efficient data transmission in the current public packet communication network. The packet communication network has various time of transmission delay because packet data doesn't use same path in the packet network. The retransmission setting time of the timer is also various. This paper proposes new method which decides retransmission timer based fuzzy theory in the packet communication protocol. The timer using the fuzzy Petri-net is modeled to implement the packet communication protocol. The fuzzy model of the retransmission timer is to infer the smoothed parameter αby constructing the fuzzy antecedent resultant from the errors between the elapsed time of one packet from the sender to the receiver and the estimated time. The fuzzy model of the timer is employed to adaptively produce the next packet timer value with the elapsed time and smoothed parameter α. We propose an effective method of network using packet mode.