Back Propagation 알고리즘의 효율성 향상을 위한 새로운 알고리즘의 개발

노찬숙 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.2

Back propagation 알고리즘은 매우 효과적이고 구현하기가 쉬워서, 최근 들어 인공 neural network에서 가장 효과적인 learning 과정으로 사용되고 있으며, 많은 분야에 적용되어 좋은 결과를 내고 있다. 그러나 이 알고리즘은 아직 개선되어야 할 여러 가지 문제점들을 가지고 있으며, 그 중에서도 특히 길고 불확실한 트레이닝 과정이 가장 시급하게 개선되어야 할 문제점으로 지적되고 있다. 본 논문에서는 이 문제점을 해결하기 위한 한 방법으로 알고리즘에서 사용되는 sigmoid 함수의 기울기를 증가시켜 알고리즘의 convergence 속도를 빠르게 할 수 있는 새로운 알고리즘을 개발하고, C 프로그래밍 언어를 사용해서 알고리즘을 구현한 시뮬레이터를 만들었다. 그리고 제안된 알고리즘의 수행능력을 측정하기 위해서 3가지의 Benchmark 문제(XOR, Parity, Encoder problems)에 트레이닝을 시키고, 현재 사용되고 있는 3개의 알고리즘과 그 결과를 비교하였다. 결론적으로 본 논문에서 제안된 2개의 알고리즘이 다른 알고리즘보다 훨씬 좋은 결과를 내었음이 비교 시험 결과로 증명되었다. The back propagation algorithm has emerged as one of the most efficient learning procedures for multi-layer, feed-forward artificial neural networks in recent years. The learning of back propagation algorithm is the systematic adjustment of connection weights in the network. The back propagation algorithm is basically a gradient descent methode that will establish the network. Because it is very effective and easy to implement, the back propagation procedure is the most widely used and has had its success in many real world applications. Despite the back propagation algorithm is the most popular learning method of artificial neural networks, its slow convergence speed has been a major obstacle in practical applications. In this paper, I propose new modified back propagation algorithms by increasing the sharpness of the sigmoid function to accelerate the convergence speed of the back propagation algorithm. simulation results are presented and possible future researches from the experiment are expressed.

문서 구조를 기반으로 한 원문정보 서비스 시스템 개발

이창조 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.1

본 논문에서는 문서구조를 기반으로 한 원문 검색 및 관리 시스템 개발을 위한 설계 및 구현을 기술한다. 이를 위해 디지털 라이브러리의 주요 시스템으로 문서설계및 구현을 기술한다. 이를 위해 디지털라이브러리의 주요 시스템으로 문서자료의 원문저장 및 검색을 위해 원문정보 시스템을 구현하였다. 본 시스템은 도서관에 소장된 연구보고서, 학위논문, 단행본, 연간물의 각 권호, 연간물 기사 및 기타 문서자료를 대상으로 문서의 구조에 따라 서지사항과 초록, 요약문과 이미지를 저장하고 검색할 수 있으며 향후 XML등의 문서구조화 표현으로 확장 가능하다. The concept of the electronic library or digital library assumes an increasingly predominant and powerful environment of national and international networks, networked information and network navigation tools. Recently, Increasing the DL project and developing systems for servicing document information, Image base management system play the role of the gateway between bibliography system and document management system. We design and implement the image base management system based on document structure. This system allows scan a document into a single or multiple files as user specifies. The gist of the system is a mechanism to structure image files so that user specifies. The gist of the system is a mechanism to structure image files so that user can access the document images. First of all, we design the architecture to store and search the document structure and printed images. In the second, define the message format for client/server communication based on TCP/IP. The next implement client module and server programs running on windows 95/NT and UNIX based machines. We enhance the image base management system into the document management system based on SGML/XML.

대전 지역 건축 설계 및 감리 사무소의 컴퓨터 기술 활용에 관한 조사 연구

최중현 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.1

The computer is considered as an essential component of the equipments that are required to set up an architectural firm since a while ago. There is, however, no concrete data on the usage of computing technology by architectural firms particularly in Taejon. This survey covers some general aspects and other detailed facts about how the architectural firms in Taejon are using the computing technology so that the results may be utilised by future researches concerning the development of architectural design in terms of computing technology.

르두의 건축이 현대건축에 미친 영향

유정훈 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.1

Few architects have been rediscovered as many times as Claude-Nicolas Ledoux. He was seen by some as a revolutionary and by others as a conservative, by some as a creator of abstract form and by others as a designer of figural buildings. A history of attitudes of towards Ledoux would furnish a well-illustrated account of the most extreme political and aestheic positions in architectural criticism, theory, and history over the last two centuries. Ledoux's work operates in a cultural field of forms and symbols that certainly evoke a revolutionary tradition, and one that is, apparently, not yet dead. Evidently, the influence of his architecture on contemporary design emerged in the various architectural movements, from Modernism to Neo-Rationalism, Post-Modernism and even Deconstructivism.

유전자재조합 대장균으로부터 Bacillus sp. 79-23의 Cellulase 정제와 특성분석

윤기홍 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.1

Carboxymethyl celluase (CMCase) was purified from cell-free extract of the recombinant Escherichia coli carrying a Bacillus sp. 79-23 CMCase gene (celS) by DEAE-Sepharose and phenyl-Sepharose column chromatography with specific activity of 400 U/mg protein. The molecular mass of the purified enzyme was estimated to be approximately 37.5 daltons by sodium dodecyl sulfatepolycarylamide gel electrophoresis. The viscosity of carboxymethyl celluose was dramatically decreased by the purified enzyme identifying that the purified enzyme is a CMCase, while the enzyme was known to be active on para-nitrophenyl-β-cellobioside. The CMCase activity was markedly inhibited by cellobiose, but was not inhibited by glucose. The enzyme activity was activated by divalent metal ions such as Mn²+ and Cu²+, but was completely inhibited by Hg²+. The enzyme was very stable below 50℃ and retained 80% of its maximum activity after incubation for 3 hours at 55℃, suggesting that few problems are in handing the Bacillus sp. CMCase as industrial enzyme at ambient temperature.

기업의 인재 개발에 관한 연구

김선종,김송식 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.1

The purpose of this research was to analyze the development a superior person in the company. This research was based on a survey. The survey was conducted on 100 individuals who were working in the company in kyoung-gi. The results showed that there were first attempted to investigate the present situation and problem of the educational insitution for training manpower for middlr company. Whereas, there were presented a general model for the development of he model in the personnel management and a model of company personnel management system. ination against employment, and workload among the position levels within a company. Finally, it is urgent to develop evalution method for the company management effectiveness and to do studies of new system of the personnel management business.

한국기업의 해외마케팅전략에 대한 연구

김홍기 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.1

Since the end of 1980's, Korean companies have been challenged by companies with their price competitiveness from many Less Developed Countries. The purpose of this study is to analyse the global marketing strategy of Korean companies in 1990's and to find their core competitiveness, either price or product, for customer acquisitiion. This study also provides empirical data about STP(Segmentation-Targeting-Positioning) strategies and Marketing-Mix strategies of Korean companies in international market.

멀티미디어 웹의 미래예측을 위한 현 상황 분석의 틀 개발에 관한 연구

이종호 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.1

Characteristics of web-based multimedia contents have been divided into five categories, promotion, information, participation, event, and application for 1) analyzing current design issues, and 2) utilizing current issues for forecasting future trends in multimedia environments. Several web sites were reviewed for the research. As a conclusion, future trends in multimedia web environment have been suggested in 3 ways. 1) woman users will be increased, 2) web application will be popular in near future, 3) new way of interaction style will be needed for handling those web based applications and net applications.

과열기 모델링과 쌍선형 시스템의 관측기를 이용한 온도제어

이상혁,노영환 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.1

본논문에서 과열 저감기를 갖는 과열기 시스템의 모델링과 과열증기의 온도제어에 대한 문제를 다루었다. 과열기 메탈의 온도는 측정하기가 용이하지 않기 때문에, 본 논문에서는 미지의 입력으로 간주하였고 미지입력을 갖는 쌍선형 관측기를 구성하였다. 미지입력을 갖는 시스템에 대한 관측기의 구성조건을 만족하기 위하여 메탈 온도의 분포를 고려하여 메탈온도를 근사화하였다. 제안된 관측기의 점근 안정도를 만족하는 충분조건을 제시하였고, 제안된 관측기를 이용하여 상태궤환 제어기를 구성하였다. 컴퓨터시물레이션을 통하여 추정값이 외부입력의 변동하에서도 과열기의 증기온도를 적절하게 추종함을 확인하였고, 출구의 온도가 적절히 유지됨을 보였다. 또한 PI제어기와의 비교도 수행하였다. This paper considers the problem of controlling the steam temperature of a superheater with a desuperheater. Since the metal temperature is usually not available for measurement, it is regarded here as an unknown input, and a bilinear unknown input observer is designed. To satisfy the condition for the construction of the unknown input observer, an approximation scheme for the metal temperature is proposed considering the distribution of the metal temperature. A sufficient condition for the asymptotic stability of the proposed observer is derived, and the design of a state feedback controller is based on the proposed observer. Computer simulations show that the estimated value follows the superheater steam temperature under the variation of the external inputs, and that the outlet steam temperature is properly maintained, and a comparision with a PI controller is made.

공동주택의 바닥소음실태 및 개선방안 연구

임병훈 우송대학교 부설 산업연구원 2003 산업연구 Vol.5 No.1

The impact noise insulation performance of a apartment floor depends on the various factors such as stiffness and thickness of the concrete slab, finishing materials and the construction method. An approach from these point of view it is important to improve impact noise insulation performance and to develop several method. In this study suggest that it will be settled urgently which is to reduce stiffness of the concrete slab, to substitute the lightweight concrete, finishing material and various constuction method such as floating floor system.