• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.949-952
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• 1993

As well-known, fuzzy control has been recognized to be of great usefulness in many engineering fields. However, the present design methods of fuzzy control systems depend on trial and error the thing that limits its usefulness. Therefore, an effective and convenient support tools for design and evaluation are greatly needed as well as the establishment of the design methods and guidling. From these backgrounds, we have developed a fuzzy control simulator[1, 2] which has various fuzzy control methods such as "direct method", "indirect method" and "fuzzy-PID method". This paper deals especially with the "direct method" function of the simulator. The simulator was developed for personal computers and programed in C language.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1991년도 추계학술발표회 논문집 지반공학에서의 컴퓨터 활용 COMPUTER UTILIZATION IN GEOTECHNICAL ENGINEERING
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• pp.332-347
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• 1991

연약 지반의 침하안정관리를 위하여서는 장래의 침하를 정확히 예측하는 것이 매우 중요하다. 이를 위한 기존의 방법으로는 Asaoka 법, 쌍곡선법, Hoshino 법 등의 여러가지 방법들이 사용된다. 이 방법들은 압밀 이론 및 경험에 근거하여 침하 계측자료들을 수학적 방법으로 처리하여 장래의 침하를 예측한다. 그러나 이 방법들에 의해 예측된 침하량과 실제 관측된 침하량의 상관계수(Correlation Coefficient)는 비교적 낮으며(0.8~0.9), 설계 하중에 대한 잔류 침하예측에 있어서도 뚜렸한 방법을 제시하지 못하는 실정이다. 본 고에서는 현장 침하계측을 현장 압밀시험으로 취급하여 그로부터 압밀계수(Cv)와 압축지수(Cc)를 구하였으며 장래 임의의 시점에서의 침하 혹은 압밀도를 구하기 위해서 현장 계측으로 부터 구해진 Cv, Cc 값을 사용하였다. 이 방법에 의하여 예측된 장래 침하량과 실제 침하량 사이의 상관계수는 기존 방법보다 훨씬 높은 값(0.97~0.99)을 보여주었으며, 지반 개량후 설계하중에 대한 잔류 침하도 합리적으로 구할 수 있었다. 상기 방법은 방대한 계산과정을 필요로 하나 오늘날 대중화된 개인용 컴퓨터를 이용하여 신속하고 효과적으로 수행될수 있었다. 본 고는 이 방법의 개요와 실제 현장 계측 자료에 적용된 결과를 제시하였다.

• 한국지반공학회지:지반
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• 제14권2호
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• pp.41-54
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• 1998

지반의 불균질성, 토질상수의 측정에 연관된 오차. 압밀이론의 단점 등으로 예측된 압밀침하량 및 시간은 항상 실측치와 잘 일치하지 않게 된다. 압축성 지반 위에 성토가 이루어질 때, 최종 침하량과 압밀시간을 예측하기 위한 예측기법은 실무에서 유용한 수단이다. 그러나, 기존의 예측기법들에 의한 침하곡선에서 직선을 찾기가 어렵거나, 개인오차를 피할 수 없는 등의 단점을 내포하고 있다. 본 논문에서는 새로운 예측기법($\sqrt{s}$법)으로 현장에서 압밀해석을 수행하기 위하여 제안되었다. 두 현장에 대하여 $\sqrt{s}$-법과 함께 다른 기존의 방법들을 적용한 결과, $\sqrt{s}$법과 Asaoka법에 의해 예측된 최종침하량은 실측치와 좋은 일치를 보여주었으나, 쌍곡선법(Tan, 1991)에서는 항상 과대평가된 결과를 또한 Hoshino 법에서는 많은 경우에 예측이 불가한 결과를 보여주었다.$\sqrt{s}$- 법에 의한 침하곡 선상에서 평균압밀도가 60%와 90% 사이에서 직선을 나타내고 있어서 개인오차를 유발할 가능성이 희박하였다. $\sqrt{s}$- 법에 의하여 예측된 최종압밀시간은 실측치와 잘 일치하고 있는 반면에 Asaoka 와 Tan(1996) 방법에 의한 결과는 아주 과소평가되거나 과대평가되었다. 이러한 이유는 후자의 두 방법에서 단계성토의 영향이 고려되지 못했기 때문인 것으로 사료된다.

• Asian-Australasian Journal of Animal Sciences
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• 제7권1호
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• pp.137-145
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• 1994

Amino acid (AA) substituted diets had no influence on rumen levels of total volatile fatty acids (VFA), ammonia and ${\alpha}$-amino-N, but tended to increase molar proportions of isovalerate and counts of total viable AA utilizing and celluloytic bacteria in the rumen as compared with the control urea diet. The AA diets did not affect daily flow to the duodenum of dry matter (DM), organic mater (OM) and acid detergent fibre (ADF), and rumen digestibility of these nutrients. However, the AA diets, in particular the 10 essential AA (EAA) diet improved total digestibility of DM, OM and ADF by decreasing faecal output of these fractions. Although N flow to the duodenum and N retention were not affected with the dietary treatments, duodenal bacterial flow appeared to increase by the AA diets when it was estimated by means of 2,6-diaminopimelic acid (DAP) and nucleic acid-purine bases (PB) as markers. The results suggest that AA supplements to a urea diet could improve feed utilization by stimulating microbial activity and proliferation in the rumen but and increased microbial activity per se is not necessarily associated with improvement of feed conversion.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.86-88
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• 1996

Using superconducting magnetic flux pump, thick power leads for a superconducting magnet could be replaced with thin string leads for the excitation magnet to the superconducting flux pump. We have developed a new type flux pump with high voltage output to shorten the charge and discharge time of the load magnet. The test of four stacked disks as the excither for the load magnet has been carried out. This disk type flux pump yielded 70 mV of voltage across its terminal and 10 A of current through 85 mH load magnet which was the field winding of 20 kVA class fully superconducting generator within 12 seconds. This output voltage of the new superconducting flux pump is about 10 times larger than that of the previous work Moreover since it is easy to stack the disks for the superconduction flux pump, the high voltage exciter for the 1H class superconducting magnet would be expected to be made easily.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.679-682
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• 2003

In this paper, we propose a Genetic Algorithm (GA) using symbiotic evolutionary viruses. Our GA is based on both the building block hypothesis and the virus theory of evolution. The proposed GA aims to control a destruction of building blocks by discovering, keeping, and propagating of building blocks based on virus operation. Concretely, we prepare the group of individuals and the group of viruses. In our GA, the group of individuals searches solutions and the group of viruses searches building blocks. These searches done based on the symbiotic relation of both groups. Also, our GA has two types of virus evaluation techniques. One is that each virus is evaluated by the difference of the fitness of an individual between before and after infection of virus. Another is that all viruses aye evaluated by the difference of the fitness of an individual between before and after infection of all viruses. Furthermore, we applied the proposed GA to the minimum value search problem of a test function which has some local solutions far from the optimal solution. And, we discuss a difference of behaviors of the proposed GA based on each virus evaluation techniques.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.690-693
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• 2003

The purpose of two player game is that a player beats an enemy. In order to win to various enemies, a learning of various strategies is indispensable. However, the optimal action to overcome the enemies will change when the game done over and again because the enemy's actions also change dynamically. Sol it is din-cult that the player aquires the optimal action and that the specific player keeps winning to various enemies. Species who have a competition relation and affect other's existence is called a coevolution. Coevolution has recently attracred considerable interest in the community of Artificial Life and Evolutionary Computation(1). In this paper, we apply Classifier System for agent team to two player game. A reward and a penalty are given to the used rules when the agent achieve specific action in the game and each team's rulebase are evaluated based on the ranking in the league. We show that all teams can acquire the optimal actions by coevolution.

• 농촌계획
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• 제19권2호
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• pp.139-148
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• 2013

This study verified for the necessity for the comprehensive analysis of outcomes resulting from the local industry promotion project in many respects. To analyze the operation planning for performance management of local industry promotion project, this study redesigns the so-called PDCA(Plan${\rightarrow}$Do${\rightarrow}$Check${\rightarrow}$Act) model which is also known as Deming Cycle and verifies some hypotheses. To accomplish study purposes, 169 response samples from 85 project groups which drive the local industry promotion project were verified using SPSS 12.0. The findings are as follows: First, there was a positive relationship between the planing phase and the implementation phase. Second, there was also a positive relationship between the implementation phase and completion of the project phase. Third, there was a positive relationship between the planing phase and completion of the project phase. Finally, the implementation phase was a partial mediator on the relationship between the planing phase and completion of the project phase. Based on these findings, the implications and the limitations of the research findings were discussed, and recommendations for future research were provided.

• Asian-Australasian Journal of Animal Sciences
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• 제6권4호
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• pp.619-622
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• 1993

Rumen bacterial amino acids in sheep on urea diet were monitored to assess a possible change in amino acid synthesis as a long term response to high rumen ammonia environment. A sheep was fed a semipurified diet with soybean meal, followed by a diet with urea as a main nitrogen source. Mixed rumen bacteria were harvested from ruminal fluid taken 3 h after feeding (twice in soybean meal feeding and 6 times in urea feeding) and fractionated as cell wall, proteins and protein-free cell supernatant of monitor amino acids in each fraction. Ruminal ammonia concentration at the sampling ranged from 5.7 to 39.5 mgN/dl. Cell wall and protein fractions of mixed rumen bacteria were stable in their amino acid composition regardless of nitrogen sources of diet and the feeding duration. However, protein-free cell supernatant fraction showed a higher alanine proportion with urea feeding (18.6 and 28.2 molar % of alanine for samples from sheep fed soybean meal and urea, respectively) and its duration (20.6 and 32.9 molar % for samples from sheep on urea diet for 1 and 65 days, respectively). Total free amino acid level of bacteria was depressed in the initial period of urea feeding but restored on 65th day of the feeding. These results suggest that an alanine synthesizing system may develop in rumen bacteria as urea feeding becomes longer.

• 한국초전도ㆍ저온공학회논문지
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• 제3권2호
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• pp.32-38
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• 2001

A 30[kVA] superconducting generator (SCG) is built and tested at Korea Electrotechnology Research Institute (KERI) in Korea. This superconducting generator has an air-gap winding instead of the typical steel teeth structure. The rotor has 4 field coils of race-track type with NbTi superconducting wired. The rotor is composed of two dampers and a liquid helium composed of two dampers and a liquid helium container in which the field poles reside. The space between the outermost damper and the container is vacuum insulated. A ferrofluid seal is used between the stationary part connected to the couping and the rotor. A helium transfer coupling(HTC) has 3 passages of the recovered heilum gas and a gas flow control system. The open circuit test and sustained short circuit test are preformed to obtain the open circuit characteristics (OCC) and short circuit characteristics (SCC) Also. the test results usder the light load (up to 3.6[kW]) are given. The structure, manufacturing and basis test of the 30[kVA]SCG are discussed.