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.

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.

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.

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.

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.

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.

다중 프로세서 컴퓨터 시스템에서 상호접속망의 효율적인 운용을 위한 연구

申仁澈,朴贊政,金成鍾 단국대학교 1989 論文集 Vol.23 No.-

Interconnection Network is to provide communication among functional modules in multiprocessor system and multistage interconnection network has various conflict resolution strategy. In this paper, Generalized Cube network is considered and two situations are examined; an memory module is equally likelly to be addressed b a processor and a processor has a favorite memory. Simulation result shows the improved performance (request service time and memory bandwidth) in some condition. We propose the effective condition of operation in interconnection network.

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.

苛性소다 處理에 依한 볏짚 Silage 의 飼料價値 增進硏究

辛炯泰,朴昌學,金章鎬,金贊昊 成均館大學校 1981 論文集 Vol.30 No.-

Nylon bag dry matter digestibility (NBDMD, %) and nylon bag organic matter digestibility(NBOMD, %) were measured to evaluate the nutritive value of Tongil and Akibare rice straws ensiled after NaOH treatment by using Korean native male goats. Experimental Korean native male goat, weighing approximately 30㎏ each, was equipped with rumen cannula. Three grams of dried samples by grinding with 2.45㎜ Wiley mill screen were put into a bag 9×14 ㎠ made of 100 mesh nylon. Nylon bags were put into the ventral sac of the rumen and taken out at the end of 72 hours. They were washed, dried in an oven at 90-100℃ for 24 hours and weighed “NBDMD (%)” and ashed in an muffle furnace at 550-600℃ for 2 hours and weighed “NBOMD”(%)”. The results which were obtained with this experiment were as follows: 1. The NBDMD (%) and NBOMD (%) of NaOH-treated Tongil and Akibare silage were highly significant different (p〈0.01) in different levels of NaOH and variety of rice straw, but NBDMD(%) and NBOMD(%) were not affected by moisture content of rice straw silage (p〉0.05). 2. The relationship between NBDMD (Y_1, %) of Tongil and Akibare rice straw silage and NaOH concentration (X, %) at 72 hours rumen incubation was: Tongil rice straw silage (50%) : Y_1=4.70X+43.67 (r=0.96^*) Tongil rice straw silage (70%) : Y_1=4.61X+46.23 (r=0.99^**) Akibare rice straw silage (50%) : Y_1=4.61X+32.93 (r=0.95^*) Akibare rice straw silage (70%) : Y_1=4.97X+35.68 (r=0.97^*) 3. The relationship between NBOMD (Y_2, %) of Tongil and Akibare rice straw silage and NaOH concentration (X, %) at 72 hours rumen incubation was: Tongil rice straw silage (50%) : Y_2=4.74X+40.21 (r=0.97^*) Tongil rice straw silage (70%) : Y_2=4.05X+43.55 (r=0.99^**) Akibare rice straw silage (50%) : Y_2=4.24X+30.26 (r=0.95^*) Akibare rice straw silage (70%) : Y_2=4.34X+30.27 (r=0.97^*) 4. The optimum level of NaOH for improving NBDMD (%) and NBOMD (%) from Tongil and Akibare rice straw silage, on the basis of Blaster et al (1961), was 3% NaOH for Tongil and 4% NaOH for Akibare. But the optimum level of NaOH for rice straw silage, on the basis of Dr. McCullough's theory, was 6% NaOH for Tongil and Akibare. 5. The NBDMD (%) of ensiled NaOH-treated rice straw were more improved 20-30% than freshly-treated rice straw. It is concluded that the nutritive value of stored straw is higher than that of freshly-treated material.

수종 치근단 역충전재가 치근단 조직 함유에 미치는 영향

신동훈,조용범,홍찬의 大韓齒科保存學會 1995 Restorative Dentistry & Endodontics Vol.20 No.1

AbstractThe purpose of this study was to examine the response of periradicular tissues to amalgam, IRM, Ketac-silver and MTA(Mineral trioxide aggregate) used as a root end fillings. The lower third and fourth premolars of 5 mongrel dogs were used. Each root was resected, followed by root end fillings with experimental materials.The animals were sacrificed after 16 weeks and radiographic and histologic results were evaluated.The results were as follows : 1. Severe inflammation around apex and disruption of cortical were noted in relation to the amalgam. 2. With IRM, there was severe infiltration of inflammatory cells around filling material, but healing of cortical bone was noted. 3. With Ketac-silver, mild inflammation and thick band of fibrous connetive tissue around filling material were seen, with a cortical bone healing. 4. In case of MTA, complete regeneration of cortical bone was seen, and free MTA was surrounded with newly formed bone tissue.