• 한국정보통신학회논문지
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• 제12권12호
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• pp.2201-2206
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• 2008

본 논문에서는 유한체의 수학적 성질과 그래프이론을 바탕으로 GF(P)상의 선형디지털스위칭함수구성을 효과적으로 구성하는 한가지 방법을 제안하였다. 제안한 방법은 주어진 임의의 디지털스위칭함수의 입출력 사이의 연관관계특성으로 부터 DCG를 도출한 후에 노드의 개수를 인수분해한다. 이때 행렬방정식을 해당 차수보다 낮은 기약다항식으로 인수분해하여 그 결과를 부분회로실현한 다음 선형결합함으로써 최종 선형디지털스위칭함수를 구성하였다. 그 결과 기존의 방법에 비해 선형디지털스위칭함수구성을 상당히 간단화 할 수 있었으며 회로구성은 유한체 GF(P)내에서 정의된 가산기와 계수곱셈기를 사용하여 용이하게 실현 할 수 있다.

• 대한전자공학회논문지
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• 제15권5호
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• pp.13-18
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• 1978

본 논문에서는 PLL의 pull-in 특성을 개선하기 위하여 delay switching PL난을 제시하였다. phase detector와 low grass filter사이에 간단한 RC delay회로를 삽입하고, 90° shift 시킨 Phase detector출력에 의하여 delay time을 switching하였다. 그 결과 pull-in range는 lock range의 1/2이상으로 넓힐 수 있었으며 pull-in time도 개선되었다. 이 개선된 Pull-in특성은 근사적으로 해석되었으며 실험으로 확인되었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(2)
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• pp.69-72
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• 2002

This paper proposed a new charge-shared switching MDAC for a pipelined A/D converter The proposed architecture accomplishes the same function of a conventional multiplying-digital-to-analog converter (MDAC). By adopting the proposed scheme, about 40% of the total capacitances could be reduced and the speed of the MDAC increases. The performance of the charge-shared switching MDAC has been Proved by HSPICE simulations.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.229-232
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• 1998

Modern telecommunications are increasingly demanding the addition of complex switching features to switching system software. These improvements also should satisfy customer demands for quick provisioning of new service features. But whenever we have developed the switching system in various types, we met problems that are lack of system engineers and short developments terms. We need new guidelines of software design to meet the demands and overcome our problems. So we propose new software platform, scenario driven call control engine (SDCCE) for ATM switching system software and implement an effective call control software using scenarios for ATM Switching System. A scenario is a set of procedures and supplementary scenarios written in data structure and gives benefits to easy adapt new or modified function by adding a scenario. The goal of SDCCE is to increase reusability and readability of software. Especially, it gives a good software extensibility and maintainability. And when we developed ptmp call processing control software, we could get high productivity by reusing scenarios and procedures of ptp call processing control software. We applied the scenario driven call control software to ATM switching system.

• 전자공학회논문지S
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• 제35S권2호
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• pp.31-39
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• 1998

In this paper, we have presented a quantitative performance effect of CCP(Call Control Processor) when SAAL(Signalling ATM Adaptation Layer) function is distributed from CCP to SIMs(Subscriber Interface Modules) in an ATM switching system with distributed architecutre. For the performance analysis, SLAM II simulation language is used and subscriber signalling messageand inter-processor communication messages according to Q.2931 based local call processing procedure are taken into consideration in the proposed queuing network model. The results of simulation are compared with in case of processing SAAL function on CCP. It is observed that the processing utilization of CCP reach 24,000 BHCA and 25,700 BHCAwhen SAAL function load amounts to 10% and 20% of the processing time of the total message, respectively. These values shows that the processing utilization of CCP is alleviated about 7% in comparison with 2,000 BHCA in case that SAAL function is carried out on CCP. Consquently, it is shown that we have to consider seriously how to distribute the functions concerning call processing in a large cale ATM switching system architecture accomodating a number of SIMs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1979년도 하계 전자.전기연합학술발표회논문집
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• pp.69-72
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• 1979

This paper deals with the computer method of finding the minimal sum of products for a switching function by using the MASK method derived from the characteristics of the Boolean algebra. The experiments with the program which is dissimilar to the previous computer programs show that the algorithm presented will be more efficient.

• 전기의세계
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• 제23권4호
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• pp.53-59
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• 1974

This paper investigates the theoretical properties of a logic element called the multithreshold threshold element, which is a generalization of the single-threshold threshold element. The primary partition os a systematic method of obtaining the multi-threshold realization of a switching function by the index numbers. The concept of comparable vertices of the same index numbers introduced in this paper is very promising for testing the multi-threshold partition by the initial condition to be defined by the minterms of the same index numbers.

• 대한전기학회논문지
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• 제36권10호
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• pp.713-718
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• 1987

A new method for the modeling of non-ideal dc-dc converters whose switching times are finite is proposed. The effects of finite turn-on, turn-off times, delay time, storage time, reverse recovery process on the system stability, dc transfer function and efficiency are investigated. It is verified how system poles are changed and how dc transfer function and efficiency are decreased by non-ideal switching.

• 전기의세계
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• 제28권11호
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• pp.37-44
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• 1979

This paper deals with the computer program of finding the minimal sum-of-products for a switching function by using the MASK method derived from the characteristics of the Boolean algebra. The approach differs from the previous procedures in that all the prime implicants are determined only by the bit operation and the minimal sum-of-products are obtained by the modified Petrick method in this work. The important features are the relatively small amount of the run time and the less memory capacity to solve a problem, as compared to the previous computer programs.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제12권1호
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• pp.47-52
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• 2012

This paper focuses on discrete-time sliding mode control with SIIM fuzzy adaptive switching gain. The adaptive switching gain is calculated using the simplified indirect inference fuzzy logic. Two fuzzy inputs are the normal distance from the present state trajectory to the switching function and the distance from the present state trajectory to the equilibrium state. The fuzzy output $f_{out}$(k) out f k is used to adjust the speed the adaptation law depending on the location of the state trajectory. The simulation results showed that the proposed method had no chattering in case of uncertain parameter without disturbance. Moreover the convergent rate of the switching gain was faster and more stable even in case of disturbance.