• 대한산업공학회지
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• 제25권2호
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• pp.217-225
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• 1999

Preprocessing is the essential technique in the implementation of the simplex method for large scale linear programming problems. In this research, we explained the effect of preprocessing in the simplex method, classified the techniques into four categories, and compared our results with those of HOPDM, CPLEX and Soplex by computational experiments. We also noted some implementing issues of preprocessing for the simplex method and the recovery of the optimal basis of the original problem from that of the preprocessed problem.

• 산업경영시스템학회지
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• 제9권13호
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• pp.51-61
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• 1986

The management science was concerned about how to use the main point of the management science model and it's technique by the rational primary factors. The problem's definition, estabilished of the model and it's solving. These function are very difficult and important problems, what is more important, are the model of management science's real prosecution to the manager and management scientist. The management science give us a clue to the solution of a business problem. To get needs conclusion and achieving the estabilished object, we must implement a plan, a stratgem, a policy. If we were not implementing the recommended items, we may call the estabilished model and problem solving impractical, ivory-tower theorizing. But, the implementation of management science model is a complicated problem that is involved mutual relations of managers and management scientist, linkage parts member and the resources of organization. And the other problems of implementation are very complicated problems composed of technologic and economic, social and politic, psychological. This paper reports the implementation of a success that possibly studies a fluent and a chief cause to systematic analysis. Then, first of all I will define of implementation and from these, construction of a unity system, I continue with a catch hold of a main point and a fluent for the successful implementation.

• 한국정보통신학회논문지
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• 제9권7호
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• pp.1407-1411
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• 2005

본 연구에서는 JXTA 기반의 P2P 컴퓨팅 기술을 J2ME 와 MIDP의 기술과 접목하여 새로운 JXTA 기반의 모바일 P2P 솔류션 구현을 가능하도록 한다. MIDP에서 제공하는 API는 무선 JXTA 피어를 창조하는데 기초역할을 수행하지만 그럼에도 불구하고, MIDP의 제한된 라이브러리, XML 파서 부족등의 한계가 있다. 그래서 이러한 자원의 한계를 극복하기 위해 중간에 릴레이 서버를 두어 제한된 환경에서 서비스 제공을 담당한다. JXTA의 가장 중요한 설계 선택중의 하나는 피어에 의해 사용되는 운영체제나 개발언어를 가정하지 않는 것이다. JXTA 프로토콜 규격은 명시적으로 네트워크 피어가 소규모 임베디드 장치에서 대규모 슈퍼컴퓨터 클러스터에 이르는 모든 종류의 장치가 될 수 있다. 이러한 기술에 J2ME의 모바일 기능을 추가한 JXTA를 사용하여 기존의 제한된 메시지 전달방법을 탈피하여 JXTA 기반의 P2P 시스템을 만드는데 있다.

• 한국멀티미디어학회논문지
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• 제18권5호
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• pp.682-690
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• 2015

Among location-based systems, a route search service is very highly utilized as a representative technique, but it provides relatively low accuracy when we find a route path on foot in our real environment. In this paper, we design and implement an optimized route search technique based on user experience utilizing open APIs as location-based services. Finally, we develop an Android-based application to provide this feature. In our experiment, we found that our technique enhanced performance by about 14-36% compared to previous solutions, such as route path searches using map APIs. In addition, the performance of our technique can be further enhanced, as the number of users who find such optimized route path is increasing.

• Journal of Power Electronics
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• 제12권1호
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• pp.88-97
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• 2012

This paper presents a method for the digital control of a high power factor AC/DC converter employing the power balance control technique to achieve a fast response of the output voltage control. To avoid the effects of an output voltage ripple in the voltage control loop, the average output voltage is sampled and used as a feedback signal for the output voltage controller. The proposed control technique was verified by simulations using MATLAB/Simulink and its implementation was realized by a dsPIC30F4011 digital signal processor to control a CUK topology AC/DC converter with a 48V output voltage and a 250 W output power. The experimental results agree with the simulation results. The proposed control technique achieves a fast transient response with a lower line current distortion than is achieved when using a conventional proportional-integral controller and the power balance control technique with the conventional sampling method.

• Journal of Power Electronics
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• 제16권4호
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• pp.1407-1414
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• 2016

Unlike existing pulse-width modulation (PWM) techniques, such as sinusoidal PWM and random PWM, the wavelet PWM (WPWM) technique based on a Harr wavelet function can achieve a high fundamental component for the output voltage, low total harmonic distortion, and simple digital implementation. However, the original WPWM method lacks output voltage control. Thus, the practical application of the WPWM technique is limited. This study proposes an improved WPWM technique that can regulate output voltage amplitude with the addition of a parameter. The relationship between the additional parameter and the output voltage amplitude is analyzed in detail. Experimental results verify that the improved WPWM exhibits output voltage control in addition to all the merits of the WPWM technique.

• 한국군사과학기술학회지
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• 제19권5호
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• pp.598-605
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• 2016

One of the effective methods for angular deception against monopulse radar is a cross eye technique. The typical cross eye technique can cause significant angular errors to monopulse radar by using two transceivers which transmit the signals with opposite phases. However, typical cross eye systems have high complexity of implementation because two transceivers should be installed with enough distance on the platform. In this paper, we propose a new cross eye technique with single transceiver based on the multipath effect. Then, angular deception performance of the proposed technique is analyzed.

• 한국컴퓨터정보학회논문지
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• 제20권10호
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• pp.31-38
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• 2015

In this paper, we propose the ensemble-based classification model which extracts just new data patterns from the streaming-data by using clustering and generates new classification models to be added to the ensemble in order to reduce the number of data labeling while it keeps the accuracy of the existing system. The proposed technique performs clustering of similar patterned data from streaming data. It performs the data labeling to each cluster at the point when a certain amount of data has been gathered. The proposed technique applies the K-NN technique to the classification model unit in order to keep the accuracy of the existing system while it uses a small amount of data. The proposed technique is efficient as using about 3% less data comparing with the existing technique as shown the simulation results for benchmarks, thereby using clustering.

• 대한공업교육학회지
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• 제44권1호
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• pp.190-208
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• 2019

이 연구는 중앙교육연수원에서 진로진학상담교사를 대상으로 하는 진로교육 직무연수의 현업적용도를 확인하기 위해서 수행하였다. 연구의 목적을 달성하기 위해서 연수 이수 3개월 후 시점에서 이수자의 현업적용도 사전-사후 설문조사, 성공사례기법(SCM), 기대회수효과(ROE)를 알아보았다. 이 연구는 2018년 7월 중앙교육연수원의 직무연수를 이수한 진로진학상담교사 136명을 대상으로 실시하였으며, 현업적용도 조사 연구와 연수에 대한 질적 분석으로 수행되었다. 연수 이수자 136명 중 현업적용도 조사에 응답한 인원은 75명, 성공사례기법에 참여한 인원은 4명이다. 중앙교육연수원에서 2018년에 추진한 진로진학상담교사 대상의 직무연수 현업적용도의 평균값은 5점 만점에 4.17점으로 비교적 높은 점수로 확인되었다. 성공사례기법은 성공 사례자와 실패 사례자를 인터뷰하여 분석하였다. 직무 적용에 따른 행동 변화는 기획자 역할이 가장 컸고 교수자 역할, 진로교육자 역할, 학습자 역할 순이었다. 또한, 사례 분석은 면담자들이 현업적용에 대한 동기, 역량, 환경적 측면에서 의견을 제시하였다. 그리고 기대회수효과 측면에서 긍정적 평가가 85.3%로 매우 높았고, 순 추천 고객지수가 .85로서 참가자들은 다시 연수 참여 의지를 보일 정도로 만족도가 높았다. 이 연구 결과를 기초하여 추후 연구를 제언하면, 새로운 연수 방법과 추가적인 요인분석에 관한 연구가 필요하다.

• 전자공학회논문지B
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• 제29B권2호
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• pp.9-17
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• 1992

In recent years, object-orientation is rising to notice as a new paradigm for developing software. This paper suggests the diagramming technique and a tool for developing C++ program effectively. This technique can represent the modularity and the interactions of classes definitely by emphasizing the characteristics of classes of C++. It can do the direct mapping from the logical idea to the physical screen image, so programmers can reuse the design resources in design phase as well as transforming the resources into chode in the implementation phase.