통일의식의 증대를 위한 시민사회의 역할

오수열,이명찬 朝鮮大學校 社會科學硏究所 2002 社會科學硏究 Vol.23 No.1

충전재-탄성체 상호작용 : Ⅱ. 상압플라즈마 처리가 나노구조의 실리카 표면특성에 미치는 영향 Ⅱ. Influence of Atmospheric Pressure Plasma on Surface Properties of Nanoscaled Silicas

박수진,진성열,강신영 한국고무학회 2005 엘라스토머 및 콤포지트 Vol.40 No.1

본 연구에서는 실리카/고무 복합재료의 기계적 계면 물성과 열안정성에 대한 산소플라즈마의 영향에 대하여 살펴보았다. 실리카의 표면특성은 XPS와 접촉각 측정을 통하여 살펴보았다 실리카/고무 복합재료의 기계적 물성과 열안정성은 각각 인열에너지 (G_(IIIC))와 열중량분석(TGA)를 통하여 관찰하였다. 실험결과, 플라즈마 처리시간이 증가함에 따라 실리카 표면에 산소가 함유된 극성 관능기의 도입량이 증가하였으며, 이에 따라 고무 복합재료의 인열에너지와 열안정성이 향상되었다. 이러한 결과는 NBR과 같은 극성고무가 산소가 함유된 관능기가 도입된 실리카와 상대적으로 높은 상호작용을 하기 때문으로 판단된다. In this work, the effect of oxygen plasma treatment of nano-scaled silica on the mechanical interfacial properties and thermal stabilities of the silica rubber composites was investigated. The surface properties of the silica were studied in X-ray photoelectron spectroscopy (XPS) and contact angles. And, their mechanical interfacial properties and thermal stabilities of the composites were characterized by tearing energy (G_(IIIC)) and thermogravimetric analysis (TGA), respectively. As a result, it was found that the introduction rate of oxygen-containing polar functional groups onto the silica surfaces was increased by increasing the plasma treatment time, resulting in improving the tearing energy. Also, the thermal stabilities of the composites were increased by increasing the treatment time. These results could be explained that the polar rubber, such as acrylonitrile butadiene rubber (NBR), showed relatively a high degree of interaction with oxygen-containing functional groups of the silica surfaces in a compounding system.

3D 모델링 기법을 이용한 작업자효율 및 생산성 분석

이수철,서승록,윤영수,양승열 한국정보전략학회 1999 추계공동학술대회 논문집 Vol.- No.01

In this paper, we developed a simulation model of a car parts assembly line to improve the system performance such as worker's utilization balancing, productivity. This simulation model has been developed using QUEST, a true 3D discrete event simulation packcage that is designed for modeling and analysis of manufacturing systems. We have suggested the results obtained to improve the system performances of an existing production line.

미국의 동아시아 정책과 한반도

오수열,이명찬 조선대학교 통일문제연구소 2002 統一 問題 硏究 Vol.15 No.-

뉴로-퍼지알고리즘을 이용한 시변동적시스템의 추적응답성능개선에 관한연구

최수열 瑞逸大學 1999 論文集 Vol.17 No.-

본 논문은 퍼지이론과 다충 PID신경회로망을 결합한 뉴로-퍼지 알고리즘을 제안하였다. 제안된 방식의 퍼지추론의 장점을 갖고있는 퍼지논리를 이용하여 뉴런활성화 함수의 기울기를 변화시킨다. 이기법은 뉴런의 조기포화상태를 방지할 수 있어 미지의 시변동적 시스템의 추적성능평가에 효율적인 방법이다. 시변의 특성을갖는 동적시스템에 본연구를 시뮬레이션 통하여 추적성능을 평가 하였다. 그 결과 제안된 뉴로-퍼지기법이 기존 PID 신경회로망제어기보다 추적성능이 개선됨을 확인하였다. In the study, Neuro-fuzzy control combined fuzzy theory and multi-layer PID neural network is proposed. The method proposed changes the slope of neuron activation function by using fuzzy logic which has merits of inference. It is very efficient to prevent a presaturation of neuron and tracking performance evaluation of unknown time variable dynamic system. This paper, proposed neuron-fuzzy control was evaluated appling tracking performance evaluation to the time variable dynamic system by using computer simulation. As a result of the study, we identified that tracking performance inprovement was developed more in case of connecting proposed neuro-fuzzy controller than conventional multi-layer PID neural networks controller.

고차구조 변화에 따른 저밀도폴리에틸렌 박막의 전기적 특성

신종열,신현택,이수원,홍진웅 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4

The electrical properties of polyethylene are changed by the superstructure. Such crystalline polymer as polyethylene or polypropylene changes crystallinity and products spherulite or trans-crystal when it is cooled slowly. In this study, after thermal treatment of LDPE at 100[℃], in silicone oil for an hour, we made specimens in order of slow cooling, water cooling, quenching according to cooling speed. Also, to study the influence of electrical properties due to the superstructure change, we analyzed physical properties and performed dielectric breakdown experiments using DC and impulse voltage. Moreover we measured space charges in bulk using Laser Induced Pressure Pulse(LIPP)method. Trap level of specimen is 0.064[eV] at the low temperature region, 0.31[eV] at the high temperature region in DC dielectric strength, 0.03[eV] at the low temperature region 0.0925[eV] at the high temperature region in impulse dielectric strength. As its result shows that the quantity of charges induced from the electrode surface increases with applied voltage time, and the distribution of space charges in samples increases the quantity of charges in proportion to applied voltage.

低溫貯藏魚類 中의 低溫性 大腸菌群에 關한 硏究

鞠重烈,張壽賢,金鍾培 군산대학교 1979 群山水産專門大學 硏究報告 Vol.13 No.3

In this study, the total bacterial count and coliforms MPN in samples stored at 5℃ investigated. The distribution, biochemical character and growth temperature of Psychrotrophic coliforms isolated from samples during cold storage were studied, also. The results were as follows : 1.The increasing rate of Psychrotrophic bacterial flora in samples was higher than that of Psy-chrotrophic coliforms. 2.In 213 strains of coliforms isolated from samples, 181 strains were Psychrotrophic coliforms. 3.The isolated Klebsiella aerogenes and Citrobacter freundii from samples were superior in number, showing 106 strains for Klebsiella aerogenes while 54strains for Citrobacter freundii. 4.The number of Klebsiella aerogenes and Citrobacter freundii of isolating Psychrotrophic coliforms showed maxima compared with others of Psychrotrophic coliforms.

정보 통신 시스템의 접지와 노이즈에 관한 연구

崔洙烈 瑞逸專門大學 1993 論文集 Vol.11 No.-

정보통신기기의 오 동작 방지와 전송신호의 오류방지 및 미시적 감전에 의한 인체의 보호, 급작스런 전기적 위험 요소로부터 통신장비를 보호하여 통신데이터의 전송율을 향상시키기 위해서는 정보통신시스템의 통신설비장비와 통신선로계통에 접지가 필요하다. 특히 일반적인 정보통신기기의 접지방법, 전화국이나 빌딩내의 전자통신기기의 접지방법과 통신 선로계의 접지에 대해 연구해 본 결과는 다음과 같다. 1. 공영접지시스템은 여러개의 통신기기를 사용시 적용되는 방법으로 저전압 직류전원의 공급으로 이루어진 통신장비에 많이 사용되고, 이 때 직류전원장치의 “+”에는 각각의 통신장비에 접속되어 있는 회로용 접지와 전원용 접지를 공용으로 통신용접지를 하여야 한다. 2. 독립접지 시스템은 전화국과 같이 고압 배전선으로 전원을 공급받아 전력 장치를 거쳐 통신 장비에 직류전원을 공급할 때는 각각의 설비에 독립접지를 하여야 한다. 3. 기준접지 시스템은 빌딩내의 전자통신기기의 안정된 가동을 위해 적용되는 시스템으로, 특히 주파수 대역폭이 높은 컴퓨터와 같은 장비에 발생하기 쉬운 고주파 장해의 노이즈를 경감시키기 위해서는 빌딩의 기준접지와 단독통신장비의 접지를 병용할 때가 단독으로 통신장비를 접지 했을 때 보다 접지임피이던스가 낮아져서 노이즈가 경감한다. 4. 통신선로계의 접지에서는 기존 유도선의 반대 방향으로 차폐케이블에 전류를 흘려서 자속을 교차 시키고, 차폐케이블의 접지저항을 작게하면 유도전압을 감소시킬 수 있다. In communicational equipments and their linen networks of informational communication systems, earth technic could minimize operational failure of various informational communiction systems, transmissional errors, and factors affecting transmissional rate deterioration of data. The following results, accordingly, can be achieved through the theoratical research to existing earth technic. 1) Common earth system is frequently used for the communicational equipments which are operated by power supply of low D.C voltage, and in this case the circuit and power supply earth, connected with each communicational equipment, should commonly be earthed to "+" terminal of D.C power equipment. 2) Independent earth system should have each equipment independently earthed when D.C power is supplied to communicational equipment through power equipment from high voltage distribution cable like a telephone exchane. 3) Basic earth system is a system applied for the stable operation of electric-electronic equipments in a building, and to minimize noise from high frequently band, basic earth of the building and earth of individual equipment should be shared because noise could rather minimized with low impedance than a communicational equipment is earthed individualy. 4) In earth system of communication line network, when magnetic flux is crossed by making electric current flow into a shield cable toward the oppose direction of present induction line and earth resistance of shield cable is lowered, Induction voltage could be minimized.

신경망모델과 자기 동조 제어기를 이용한 이산신호의 추적 성능 개선

최수열 瑞逸大學 1998 論文集 Vol.16 No.-

본 논문에서는 추적 성능 개선을 위해 기존의 신경망 제어기에 PID제어기를 직렬로 연결하여 시뮬레이션 결과를 고찰했다. 추적 성능을 평가하기 위해 신경망모델은 2계층으로 구성하고 Widrow-Hoff델타 규칙을 이용하여 예측 오차가 최소화되도록 정규적인 동특성을 학습하였다. 이 학습 결과, 기존의 신경망제어기의 경우보다 PID를 연결하였을 경우가 추적 성능이 다소 개선되었음을 확인했으며, 251샘플에서 추적할 플랜트 파라메터가 시변인 경우에도 빠른 속도로 수렴되는 결과를 얻었다. In this paper, Simulation result was studied by PID controller in series to the estblised neural networks controller. Neural network model is composed of two layers to evaluate tracking performance improvement. The regular dynamics was also studied for the expected error to be minimized by using Widrow-Hoff delta rule. As a result of the study, We identified that tracking performa- nce improvement was developed more in case of connecting PID than conventional neural network controller and that tracking plant parameter in 251 sample was approached rapidly in case of time varying.

개량조개의 煮熟冷凍品에 關한 細菌學的 硏究

張壽賢,鞠重烈 군산대학교 1978 群山水産專門大學 硏究報告 Vol.12 No.2

VA-N, TMA, Coliforms, E. coli and Bacterial flora in the raw sample of Henclam, in the Henclam by their process and the Henclam by date during the frozen storage were studied. The results were as follows : 1) The value of VB-N and TMA got increased according to the period of frozen storage. But the increased rate of TMA was higher than that of VB-N. 2) The number of General bacteria, Coliforms and E. coli in the sample selected after the third washing were 2.6×106 cells/g, 3.1×102 cells/g and 2.8×10 cells/100g. The sample showd maximum of bacterial contamination compared with others. 3) Pseudomonas and Vibrio of Bacterial flora in the raw Henclam were superior in number. 4) Micrococcus and Moraxella of Bacterial flora in the Period of frozen storage were superior, in number, showing 35% and 25%. 5) Klebsiella aerogenes group of Coliforms showed maximum of 50.7% compared with others in the period of frozen storage.