카올린에서 추출한 Silica로부터 탄소 환원질화에 의한 질화규소의 합성

신현택,형유업,박찬욱,배원태 慶尙大學校生産技術硏究所 1987 生産技術硏究所論文集 Vol.3 No.-

Nitriding behavior of the mixtures of amorphous silica extractracted from San Chung White kaolin and activated carbon Were studied by varying the carbon content, reaction temperature, and time under N₂atmosphere. Experimental results obtained from XRD, SEM and TEM indicated that the nitridation of the mixtures initiated below 1200℃ and mullite, silicon oxynitride, β-Sialon, β-SiC, and α-and β-Si₃N₄were identified as reaction products. Optimum nitridation condition of extracted silica were as follows. 1. Carbon/Extracted silica (in weight ratio)=3. 2. Reaction temperature; 1350℃ 3. Reaction time ; above 1hour.

주부의 환경에 대한 의싯과 세탁습관에 관한 연구

신윤숙,정찬진 全南大學校家政科學硏究所 1995 生活科學硏究 Vol.5 No.-

The purposes of this study were to investigate 1) housewife's concerns for environment and the influence of age, education, and occupation on environmental concern, 2) information source on environmental preservation, 3) the relative importance of selection criteria and the influence of environmental concerns on selection criteria in detergent purchase decision, and 4) general laundering practice and the influence of environmental concerns on the laundering practice. For this study, 400 questionnaires were administered to housewives in Kwangju. The 325 questionnaires were analyzed by using frequencies, percentage, analysis of variance, Duncan Test, Correlation, and Spearman Correlation. The results of this study were as follows: 1. 72.3% of respondents had concerns for environmental preservation. In addition, house-wife's age and level of education did not influence on environmental concerns, but occupation did. Specifically, a working housewife tended to have more concern for the environment than a full-time housewife. 2. The important sources of information on environment were identified by TV and news-paper. 3. In making detergent purchase decision, the housewife placed importance on detergency, unpolluting detergent, price, and toxicity, in order. The housewife who concerned about environment placed importance more on unpolluting detergent and less on price and a handy container or packing. 4. In relation to laundering practice, 38.4% of respondents used a washing machine 3-4 times a week and 70.2% did cold washing. 32.3% of them used synthetic detergents in hand washing. Besides, four laundering types were classified as a reasonable type, a type of im-proving detergency through extra-action, a type of using additives, and a type of detergent overuse. In relation to the laundering types, housewife's level of education and occupation did not influence on the laundering type, but their age did. Specifically, the 40's and the 50's of age tended to improve detergency through extra-action. In addition, the housewife who concerned about environment tended to do extra-action for improving detergency and not to overuse detergent.

Paraquat 투여 백서에서 Cyclophosphamide와 Dexamethasone의 치료 효과

신정철,신양수,유병전,임현성,정태흥,박찬국,오금탁,이병래 朝鮮大學校 附設 醫學硏究所 1991 The Medical Journal of Chosun University Vol.16 No.1

Paraquat (N,N'-dimethy 1-4,4'bipyrydinium : Gramoxone^(R), a widely used herbicide, is extremely toxic to all green plants and many eukaryotic organisms. In human, paraquat intoxication leads to multiple organ failure, it preferentially damages the lung, kidney and liver and may result in death. The participation of superoxide in initiating tissue damage by administration of paraquat is well known in which one electron reduction of paraquat leads to the formation of radical species which react with molecular oxygen to give superoxide. This process initiates immunological changes with the activation of neutrophilic leukocytes, which is related to further production of superoxide. In this experiment, therapeutic effects of cyclophosphamide and dexamethasone on blood cell count, malondialdehyde as a indicator of lipid peroxidation, and antioxidant enzymes levels in the lung, liver and kidney of paraquat intoxicated rats were inbestigated. The WBC count were significantly decreased by combined treatment of cyclophosphamide and dexamethasone in paraquat intoxicated rats at 3 and 5 days but RBC count were not changed. The contents of malondialdehyde were significantly decreased in the lung and Kidney by combined treatment at 10 days after paraquat intoxication. The catalase acitvities were markedly increased in the lung and liver of rats at 10 days after paraquat intoxication, and superoxide dismutase activities showed minimal changes in the lung, liver and kidney of rats by combined treatment. These results suggest that paraquat induced tissue damage in rats can be redeced by combined administration of cyclophosphamide and dexamethasone.

海南地域에 分布한 徵文象花崗岩의 岩石學的 및 構造力學的 硏究

申仁鉉,柳贊洙 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

This study is on the micrographic granites of the Cretaceous around Mt. Duryum, Mt. Daedun, and at Haenam in Chollanamdo. Precise field research was made several times to perform this study and 150 samples were gathered. Seventy-six thin sections were made of 76 chosen samples which were fresh, and moda1 analysis was done on 25 thin sections. According to the resu1ts of motal analysis micrographic granites around these research are as come under granite. According to the results of the structural mechanics of the micrographic granites in these reearchs are as predominated strikes N40-50W, and N50-60E. According to Fig.2, these micrographic granites are similar to the distribution of Bulgugsa granites.

Interconnection Network의 Performance Analysis에 관한 硏究

申仁澈,朴贊政 단국대학교 1986 論文集 Vol.20 No.-

In this paper performance analysis of the circuit switching Omega network operated in MIMD mode is studied. Two different conflict resolution strategses, drop and hold, are tried to see the performance difference. Request Service time (RST) is used as a performance evaluation factor and studied through simulation. Hold model is better when data transfer time is short, but drop model is better when data transfer time is long enough.

Bit-Slice Microprocessor 設計에 관한 硏究

申仁澈,李相範,朴贊政 단국대학교 1984 論文集 Vol.18 No.-

Recently, amount of informations increase rapidly, so the need for H/W and S/W redesign is required. But it is difficult to change H/W and S/W for expanding the word length and control sequence steps because the commercial microprocessors have fixed word length and fixed instruction sets C.P.U. This paper represents the design method of microprogrammed bit-slice microprocessor which is expansible of data word length and control sequence steps with easy. Especially the control sequence and instruction set of system can be chaged without chnaging H/W. The implementation of H/W is designed with A.M.D product components.

RSA 암호화 알고리즘의 구현에 관한 연구

신인철,이민섭,박창섭,김범식,우찬일,최춘수 단국대학교 1998 論文集 Vol.33 No.-

Recently, the information exchange through a communication network has been increased rapidly. When the sensitive information being sent or stored, the cryptographic technique can be employed in order to prevent it from being exposed or modified by the illegal third party. To implement public key encryption systems based on the integer factorization and the discrete logaritm problem, an efficient exponential arithmetic is mandatory due to large numbers involved. In this paper, the general analysis about the high­speed implementation of primality testing and exponentiations are investigated as well as implementing RSA public­key system. The public­key cryptosystem can be applied to any applications which need both the privacy and the authentication. Finally, suing the software package named MIRACL which provides the basic number theoretic routines for cryptographic software developers. we have implemented the RSA encryption and decryption with Blum­Goldwasser probabilistic algorithm under various key and message size.

N칸에서의 영어 교육 통합론: 溫故而知新

장신재 홍익대학교 인문과학연구소 2000 人文科學 Vol.8 No.-

Based on the idea of learning the new by learning the old, the most effective method of learning/teaching English in Korean schools is sought. Learning/teaching theories in psychology, linguistics, and education are discussed. Each position in theories is discussed. Students and teachers' personality factors and educational situations are also discussed. Then, the discussion concludes that all theories and positions have to be integrated to reach holism in learning/teaching English in Korean schools.

철근콘크리트 전단벽체와 경계 기둥의 띠철근 보강에 따른 구조성능 평가

申鍾學,河基柱,全燦穆 慶一大學校 1997 論文集 Vol.14 No.2

Ten reinforced concrete rigid frames and infill shear wall frames involved bare frames were tested during vertical and cyclic loads simultaneously. Experrimental programs carried to investigate the horizontal strength, crack propagation and ductility etc. All specimens were modeling in one-third scale size. In this experimental program structural performance of reinforced concrete shear wall were focus at the variation of hoop reinforcement. From the above testing, We have the following conclusion. (1) It was not largely varied horizontal stress, in fully rigid frame the specimens(FB-2, 3, A, B, C), when the ratio of hoop bar, in both colums, were varied the horizontal stress and ductility did not varied. (2) The specimens(FB-2, 3) in fully figid frame, as the ratio of hoop bar, both columns, are increased, was caused main bending and shear crack in the capital and the base of column. But the specimens(FB-A, B, C) as the ratio of hoop bar of left columns are not increased, was caused compression failure and concentration of shear crack so that happen sudden collapse in the base of column. (3) In fully rigid babel type shear wall, specimens(FW-B, C) that make increased ration at right column. is larger about 1.5 times than specimens of is not varied specimen(FW-A) in ductility. (4) In fully rigid babel type shear wall specimen as the ratio of hoop bar is varied, the shear stress and the horizontal stress of the specimen that the ratio of hoop bar of boundary column is increased about 1.1∼1.2 times than those of specimens(FW-A, B, C).

동하중 측정 신호처리의 개발에 관한 연구

신영균,이영준,박찬원,신형재,안광희 江原大學校 産業技術硏究所 1998 産業技術硏究 Vol.18 No.-

A high speed and stable A/D conversion data process is required to weigh a mass on moving conveyer weighing platter. The paper presents a new method to obtain stable and fast automatic weighing A/D conversion data process. Dynamic weighting system which is constructed with dual load cell is realized by the stable A/D conversion data preocess algorithm using DSP. The proposed memthod is applied to the real design, and that experimental results showed good performances of the weighing stability.