• Proceedings of the KIEE Conference
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• 2001.10a
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• pp.205-207
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• 2001

In response to this inverter microwave oven has been developed to improve high speed cooking time & energy saving performance. The voltage resonating inverter has a defect in switching element that works at 5 or 6times higher than input voltage. Especially, it is very difficult to choose the switching device is very high for the 220 (V) commercial voltage. In this paper, it is proposed the optimum method to realize the turbo 1200(W) output power for microwave oven that is employed the 900(V) IGBT with decreasing operating voltage of the switching component by making the 220(V), 1000(W) inverter through the active clamp voltage resonating inverter.

• Proceedings of the KIPE Conference
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• 2001.07a
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• pp.331-334
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• 2001

The voltage resonating inverter has a defect in switching element that works at 5 or 6times higher than input voltage. Especially, it is very difficult to choose the switching device is very high for the 220(V)commercial voltage. In this paper, it is proposed the optimum method to realize the turbo 2000(W) power for induction cooker that is employed the 900(V) IGBT with decreasing operating voltage of the switching component by making the 220(V), 1500(W) inverter through the claim mode voltage resonating inverter.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.774-776
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• 2003

In this paper the controlled closing algorithm to locate contact touch instants within the span in which the making voltage is minimized is proposed with the characteristics of circuit breakers such as RDDS(rate of decrease of dielectric strength) and a mechanical operating tolerance taken into account. The analytic results on the voltages across circuit breaker terminals upon closing operation play an important roles as references to describe the suggested method. Even though in the case of the isolated neutral capacitor banks, it is possible to decide the optimum contact instants without any dedicated procedures.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2340-2342
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• 2003

본 논문에서는 최적 전력 제어를 이용하여 이동국과 기지국간 최소의 소비 전력과 최대의 채널용량을 유지할 수 있는 알고리즘을 제안하고자 한다. 이동통신 시스템은 한 기지국 안에 속한 가입자 사이에 간섭이 발생할 뿐 아니라 동일한 대역을 사용하는 기지국 사이에도 간섭이 발생하게 된다. 또한 이동통신 시스템은 열악한 무선 환경을 기반으로 수시로 변화하는 가입자 요구를 수용해야 한다. 따라서 가입자 요구에 적절히 대응하는 최적 전력 제어가 이루어져야 원활한 서비스를 가입자들에게 제공할 수 있다. 즉, 동시 통화를 시도하는 여러 가입자들 간의 간섭을 받지 않고 알맞은 통화의 질을 제공받을 수 있도록 하는 전력 제어의 과정이 필수적이다.

• Proceedings of the KIEE Conference
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• 1996.07b
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• pp.1401-1403
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• 1996

A new method is proposed for tracking the optimum points in nonstationary problem via genetic search. Cache Pool to save the past genetic informations is added to population in search using Sexual Reproduction Genetic Algorithm(SRGA). In Cache Pool, elite chromosomes from population are accumulated. A best Individual is made up from these chromosomes in varying environment and inserted into the newly reproduced population every generation. Experimental results indicate changing global optima are accurately identified and followed.

• Journal of Korea Society of Digital Industry and Information Management
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• v.4 no.3
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• pp.69-75
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• 2008

The objective of this paper is to increase the performance by selecting the optimal value in outputs of two algorithms that are Generlized-Lagrange and LMS(Least Mean Square). This paper presents superior performance by mixed two of conventional algorithm arbitrary. Based on the analysis from various simulation, it is observed that proposed method is better performance in terms of practical WLL(Wireless Local Loop) environment.

• Journal of Information Processing Systems
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• v.11 no.3
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• pp.354-369
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• 2015

Recently, there has been an increasing demand of high data rates services, where several multiuser multiple-input multiple-output (MU-MIMO) techniques were introduced to meet these demands. Among these techniques, vector perturbation combined with linear precoding techniques, such as zero-forcing and minimum mean-square error, have been proven to be efficient in reducing the transmit power and hence, perform close to the optimum algorithm. In this paper, we review several fixed-complexity vector perturbation techniques and investigate their performance under both perfect and imperfect channel knowledge at the transmitter. Also, we investigate the combination of block diagonalization with vector perturbation outline its merits.

• Journal of Korean Institute of Industrial Engineers
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• v.18 no.1
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• pp.169-176
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• 1992

In parts assignment problem for FMS, both the parts and the tools required to process the parts are assigned to the machine tools for a specified planning period. This is an important decision-making problem for a short-term production planning of FMS. In this paper, parts assignment problem for FMS was analyzed to determine the optimal plan which has the adaptability to production fluctuation. A mathematical model was developed for determing the parts and the tools required for the machine tools which compose FMS, and the model was analyzed to obtain optimal solution. In addition, the vality and feasibility of the computational algorithm was examined by solving a numerical example.

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.409-413
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• 2008

In this paper, we introduce a platform of advanced multiple antenna system based on orthogonal frequency-division multiplexing (OFDM). The advanced multiple antennas have beamforming gain using array antenna. In array antenna systems, received signal has phase delay caused distance of each antennas, therefore it should compensate with optimum weight vector which calculated by Lagrange algorithm. To implement the presented above procedures using Digital Signal Processor (DSP), we should fixed-point design. The performance of implemented platform is verified through MATLAB$^{(R)}$ simulations with various signal environments.

• Journal of the Korean Institute of Navigation
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• v.21 no.4
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• pp.1-9
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• 1997

A study on theergonomic design of the automated ship's bridge and console layout was carried out through this paper. The goal of this study is to find out the effective and ergonomic optimal design solutions of bridge layout hence to reduce the duty officier's workload and increase the safety of navigation. The conventional bridge layouts and modernized Integrated bridge layouts were compared using several factors. To use human factors, an ergonomic control panel layout system based on constraint satisfaction algorithm wa squoted. And the integrated ergonomic bridge layout was converged and applied to the redesign of the navigational console layout.