A Generalized Equivalence relation

Sung, Yeoul-Ouk,Lee, Seung-Bae 公州大學校 工學硏究院 生産技術硏究所 2005 論文集 Vol.13 No.-

In the this paper, We introduce the concept of t-fuzzy equivalence relation on a set, and to prove that there exists a correspondence between t-fuzzy equivalence relation and t-fuzzy partitions, and to characterize the fuzzy difunctional relations in terms of its strong t-level subsets.

퍼지노름공간의 완비화

성열욱 公州大學校 基礎科學硏究所 1999 自然科學硏究 Vol.8 No.-

X. Y가 노름공간이고 ρ₁, ρ₂가 각각 X, Y에서의 lower semi-continuous 퍼지노룸이며 bounded support를 가질 때 Y가 퍼지완비이면 X에서 Y로의 모든 퍼지연속선형사상들의 집합은 퍼지완비노름 공간임을 증명하였고, 또한 [2] 의미에서의 퍼지공간거리에 퍼지노름공간의 개념을 소개하였다. Let X, Y be normed linear spaces, and let ρ₁, ρ₂ be lower semi-continuous fuzzy norms on X, Y respectively, and have the bounded supports on X, Y respectively. In this paper, we prove that if Y is complete, the set of all fuzzy continuous linear maps from X into Y is a fuzzy complete fuzzy normed linear space. Also, we introduce the concept of a fuzzy normed linear space on the concept of fuzzy metric spaces in [2].

Fuzzy Functions and There Fundamental Properties : 퍼지 함수에 관한 고찰

성열욱 공주대학교 기초과학연구소 2000 自然科學硏究 Vol.9 No.-

퍼지 집합의 개념이 Zadeh에 의해서 처음 소개된 이후 수학의 여러 분야에서 많은 연구성과가 이루어져 왔다. 그 중, 퍼지함수의 개념은 Nemitz와 Sasaki에 의해서 도입되었지만, 크리습함수의 퍼지화 과정에서 자유롭지 못하였다. 따라서 본 논문에서는 퍼지함수를 보다 자연스런 방법으로 정의하였고, 또한 퍼지함수와 관련된 기본 성질들을 연구하였다 In the present thesis, the fuzzy equality of two points of a crisp set which is more convenient than that in Coker and Sasaki and the fuzzy function having weaker conditions than that is given in Sasaki are redefined in much more natural way. Also many basic properties related to the various types of fuzzy function are established.

Some properties of t-Fuzzy Equivalence Relations

Sung, Yeoul Ouk,Ro, Young Soon 公州大學校 基礎科學硏究所 2004 自然科學硏究 Vol.11 No.-

한 집합에 티 퍼지 동치관계를 도입하여 티 퍼지 동치관계와 티 퍼지 분할사이에 일대일 대응이 존재함을 밝혔다. In this note we introduce the concept of a t-fuzzy equivalence relation on a set and give some results in connected with such relations. In particular, we prove that there exists a correspondence between t-fuzzy equivalence relations and t-fuzzy partitions. In addition, we characterize the fuzzy difunctional relation in terms of its strong t-level subsets.

소집단 학습을 통한 수학과 학습부진아 지도방안 연구

성열욱,신경순 한국학교수학회 2001 韓國學校數學會論文集 Vol.4 No.2

It is necessary that at any rate we try to decrease underachievers by learning deficiency in mathematics to extreme limits under circumstances that mathematics becomes more requires daily in the 21st century's informative society. However, the traditional teaching method causes a lot of problems in elevating the needed ability for the newly changing society. Accordingly, for the purpose of letting underachievers by learning deficiency have much interest in mathematics, seek the qualitative elevation, have the feelings of self-confidence and accomplishments, escape from desperation, and also teachers choose the activities of small groups, design teaching plans, apply those to teaching-learning activities and finally verify the effect, this researcher sets up a hypothesis as follows: 1. The teaching method through small groups will be effective for the accomplishments of underachievers in mathematics. 2. Its method will bring out the meaningful change in the emotional areas of mathematics. Therefore, so as to prove the above hypothesis, the results through the theoretical approach and practicing learning by small groups have turned out to be positive.

동기유발을 위한 ARCS이론을 적용한 수업이 수학과 문제해결력 신장에 미치는 영향

성열욱,김상운 한국학교수학회 2001 韓國學校數學會論文集 Vol.4 No.2

All men's achievement and behavior is always based on motivation. It has been reported that learning motivation plays an important role to get achievement of study to approximately 16∼38%. Therefore, a lot of researchers agree that learning motivation must be required for learning achievement. This study focuses on "How behavior induces learning motivation from learners?" I adapted "the Attention, Relevance, Confidence, Satisfaction" which is supported by John. M. Keller in the model of ARCS to the course of teaching-learning in order to improve them systematically. The effectiveness and results of adaptation must be considered to solve the math problems.

正祖시대에 이르는 實學的 風水思想의 흐름

배상열 원광대학교 동양학연구소 2008 東洋學硏究 Vol.4 No.

It is grasped that Silhak was developed for about 250 years from the second half of the 17th century to the first half of the 19th century. The academic world has a broad study on Silhak's Thought by each period, region, thought, science and field all through the field including politics, economy, society, education and arts. However, a study on a correlation between Poongsoo Geography and Silhak which are Korean traditional sciences is still not enough. Therefore, to study on a close correlation between Poongsoo Geography and Silhak, the study classified Silhak's Poongsoo Thought by connecting Silhak' s process of development by each period with social and economic background in convenience. It is also necessary to have a positive study on scientific characters in the above process and Silhak's Poongsoo Thought. However, the study examined the source and background of Silhak's Poongsoo Thought focused on the periodical change of Poongsoo culture, prior to study on Poonsoo Thought of Silhak scientists. The purpose of the study was to propose a formative background of Silhak's Poongsoo Thought, prior to discourse upon Poongsoo thought of the King, Jeong-Jo and representative Silhak scientists in the period of the Joseon Dynasty. 實學이 발전한 시기는 17세기 後半으로부터 19세기 前半期에 걸치는 250여 년간으로 파악되고 있다. 이에 대하여 學界에서는 정치·경제·사회·교육·예술 등 전 분야에 걸쳐 시기적·지역적·사상적·학문적 그리고 분야별로 實學思想에 대한 연구가 광범위하게 이루어지고 있다. 그러나 韓國의 전통학문인 風水地理學 분야와 실학과의 相關關係에 대한 연구는 아직까지 미흡함을 감출 수가 없다. 따라서 풍수지리사상과 실학과의 상호 관련이 밀접한 상관된 문제를 硏究하기 위하여 실학의 발전 展開과정과 사회경제적 背景을 연결하여 실학적 풍수사상에 대한 분류를 적용하고, 이 과정에서 드러나는 학문적인 特性과 실학적 풍수사상에 대해 적극적인 연구가 필요하다. 하지만 이들 실학자들의 풍수사상을 연구하기에 앞서 이들의 實學的 風水哲學을 성립시킨 원천과 實學的 風水思想의 성립배경에 대하여 풍수 문화의 시대적 변천을 중심으로 연구해 보는 것은 큰 意味가 있다. 본 논문의 目標는 이러한 정조의 풍수 철학관과 조선시대의 대표적인 실학자들의 풍수적 사고를 논술하기에 앞서 그에 대한 실학적 풍수사상의 形成 背景에 대하여 제시하는데 意義가 있다.

황강의 저서성 대형무척추동물의 군집구조에 관한 연구

류성만,전영태,이종욱,차진열 嶺南大學校 基礎科學硏究所 1997 基礎科學硏究 Vol.17 No.-

The present study was conducted to determine the community structure in Whang river based on the benthic macroinvertebrates. The survey area included eight sites in Whang river and two sites in Nakdong river and the study was carried out from March of 1995 to February of 1996. The result are as follows; (1) Benthic mactoinvertebrates are composed of a total of 200 species including 114 genera, 71 families, 21 orders, 7 classes in five phyla. A total of 200 species was found in Whang river, however only 66 species were recorded in Nakdong river. 2) Species frequency was different depending on the study area. It ranged from 84-112 species in the upper stream(site 1 to 6) to 71-75 species in the lower stream(site 7 to 8) and 41-58 species in the Nakdong river(site 9 to 10). Taxa with highest species frequency were aquatic insecta. 3) Average number of individuals was 1656.5/0.5㎡ in the whole study aera. Inividual number was variable from 53/0.5㎡ at the site 8 to 296.8/0.5㎡ at the site 4. Taxa with highest individual species frequency were aquatic insecta. 4) Trichoptera and Ephemeroptera were dominant in upper stream, while Chironomidae was the most aboundant group in the lower stream. 5) Average dominance(DI), species richness(RI), species diversity(H'), and evenness(J') were 0.68, 2.71, 3.10 and 0.71, respectively, in the whole study area. The biotic indices in Whang river were relative higher than that of Nakdong river. 6) Functional feeding groups were collectors and shredder at site 1 to 6, filterer at site 7 to 10.

냉각 Cycle Matching을 위한 핀-관 열교환기의 설계 Program 개발

김재열,마상동,최충현 조선대학교 에너지.자원신기술연구소 1997 에너지·자원신기술연구소 논문지 Vol.19 No.2

The purpose of this study is to develop the optimum design program of air cooled fin-tube heat exchanger. Logarithmic mean temperature difference(LMTD) method which is generally acceptable is used to design the air cooled fin-tube heat exchanger. In the coventional heat exchanger design by LMTD method, heat transfer, overall heat exchanger coefficient, and heat exchanger area are calculated by using the inlet and outlet temperature of heat exchanger. The design for the two phase flow in the tube of heat exchanger can be applied to the design of considers by LMTD method. A performance comparison according to the different refrigerants is provided using R-134a and R-12. As the result of this study, total heat transfer rate of heat exchanger using R-134a were found higher than that of using R-12 for the same operating conditions.

회천의 저서성 대형무척추동물에 의한 생물학적 수질 평가에 관한 연구

차진열,이종욱,류성만 嶺南大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.16 No.-

The present study was carried out to determine the water quality based on the biological evaluation of water pollution in Hoe Stream. The survey was carried out through the whole Hoe stream(sites 1-9), and two sites in Nakdong River(site 10,11), meeting before and after Hoe Stream from March, 1995 to February, 1996. The results are as follow; (1) Benthic macroinvertebrates in present study are composed of total 200 species, 115 genrea, 68 families, 21 orders, 7 classes in 5 phyla and among them, Aquatic insects are composed of 171 species, 91 genera, 52 families in 9 orders. According to comparison of Hoe Stream and Nakdong River, benthic macroinvertebrates in Hoe Stream are composed of total 199 species, 114 genera, 67 families, 20 orders, 7 classes in 5 phyla, and in Nakdong River are composed of total 44 species, 28 genera, 25 families, 13 orders, 6 classes in 3 phyla. (2) The dominant species were investigated as Trichoptera and Ephemeroptera in upper reaches, and Chironomidae in lower reaches. (3) The diversity indices are 2.154∼3.619, and it means, that in Hoe Stream appeared higher value than in Nakdong River. (4) Conclusively, almost all factors of water quality in present study was one to four levels. Hoe Stream showed one to three levels and appeared four level in Nakdong River.