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신혁수, 김동범, 박진근, 이인환, 조해용 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2
A valve spring retainer is a small disc and located at intake and exhaust valve stem of engine. The retainer supports a valve spring and transmits spring force to a valve. Force is applied to the retainer repeatedly by a rocker arm. Durability of the retainer is an important factor of performance. Weight of retainer affect dynamic performance of engine. Therefore, optimal strength and weight of the retainer design are needed. In this study, stress distribution and fracture load of retainer were analyzed by using FEM to design optimal strength and weight. Static load test was simulated by using commercial FEM code DEFORM-3D. Shapes of the retainer to reduce weight were designed and analyzed to verify validity of it. Simulated results and experimental ones were compared
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필러 모델과 음소 모델 네트워크를 이용한 비인식 대상 문장 거부
이병혁,하진영 강원대학교 정보통신연구소 2005 정보통신논문지 Vol.9 No.-
Non-recognition utterance rejection is very important to improve the confidence of speech recognition system. Research efforts have been made for out-of-vocabulary word rejection. However, little attention has been paid to non-recognition sentence rejection. According to the appearance of pronunciation correction systems using speech recognition technology, it is needed to reject non-recognition sentences to provide users with more accurate and robust results. In this paper, we introduce three recognition network structures - phone-level, word-level, and sentence-level filler model network - using phone models and filler models to implement non-recognition sentence rejection system. We present three types of filler models: VC(Voiced Consonant), C(unvoiced Consonant), and V(Vowel) in the recognition network. Several experiments were performed to select the best network structure. We found that the word-level filler model network outperforms both phone-level model network and sentence-level filler model network. In addition, another experiment has been performed to find an optimal garbage ratio threshold according to the number of words in each target sentence. Experimental results show that we can achieve better performance using a length dependent threshold than using a constant threshold in terms of the average of FAR and FRR.
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우진운,김혁수 단국대학교 1996 論文集 Vol.30 No.-
The hypercube is a widely used topology for the interconnection network connecting processors of multicomputer, due to the economic and structural features. The communication of hypercube multicomputer is one of considerations to enhence the efficiency of programs. In the most systems, the communication is done by calling subroutines and messages are passed through the shortest path. In this work, we propose a communication management algorithm that keeps track of the communication routines where errors frequently occur in the hypercube programs. As a result, this algorithm can prevent processors from having a deadlock when executing programs in the hypercube system.
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김진환,이우태,김종혁 全南大學校 觸媒硏究所 1996 觸媒硏究 論文集 Vol.18 No.-
Composite membranes containing a metal complex as an oxygen carrier were prepared and tested for the capability of oxygen enrichment. The permeability characteristics of the membrane were measured by the volumetric method with the pressure difference ranging from 0.2 to 0.8Kg/cm². Both oxygen and nitrogen showed constant permeabilities, diffusion coefficients, and solubilities which do not depend on the pressure difference across the membrane. The metal complexes were also found to play a role of nitrogen carrier to a degree. For the case of the silicone membrane with Co(NO₃)₂.6H₂O complex, the permeability and the separation factor of oxygen were significantly improved to ??/cm³·cm/cm²·sec·cm-Hg and 2.7 respectively, at the pressure difference of 0.4Kg/cm². This improvement was attributed to the metal complex which acts as an oxygen carrier and thus increases the solubility of oxygen in the membrane.
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金鎭淇,崔京求,白南赫,陳星桂 全北大學校 1982 論文集 Vol.24 No.-
全北 平野地인 裡里地方에서 옥수수의 播種期와 地上部生育 및 種實收量과의 관계를 調査하여 다음과 같은 결과를 얻었다. 1. 播種期의 早晩이 莖葉의 生育 및 種實收量에 크게 영향을 끼치며 播種이 늦어질수록 出雄, 出絲, 生育日數가 짧아지고 地上部生育은 떨어지는 경향이다. 2. 莖葉生育은 4月 20日 播種을 基點으로, 種實收量은 5月 5日 播種을 基點으로 各各 減少되었다. 3. 地上部諸形質과 種實收量간에는 高度의 正의 相關이 인정되며 種實增收를 위하여는 莖葉生育은 크게 할 필요가 있다. Some results were gained through the experiment that was carried out with a single cross cultivar, Suweon 19, of maize (Zea mays L.) in Iri, the Jeonbug plain area, in 1980, to check relationships between growth characters at different sowing dates. 1. The foliage growth and grain yield were greatly influenced with planting season. The number of days to tasseling, silking, or maturing shortened and the growth of maize decreased as sowing was delayed. 2. The threshold sowing date for foliage production seemed to be April 20 and that for grain yield, May 5. 3. Highly significant positive correlation existed between vegetative growth and grain yield. This may mean that increasing vegetative growth is prerequisite to better grain yield.
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김형진,이지영,권혁윤 한국공업화학회 2004 응용화학 Vol.8 No.1
This study was carried out to evaluate the application possibility of UF Membrane System to papermaking industry in order to optimize the recycling of white water. In this study, for the efficiency test of UF modules, the MWCO(molecular weight cut-off) of the membrane was estimated by the COD measurement from UF filtrate water. From the rejection rate of membrane, three kinds of UF module were selected and evaluated in the factors of COD, SS, turbidity and flow rate.
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최해진,권혁기 대한경영학회 2003 大韓經營學會誌 Vol.16 No.6
This paper suggests a contingent perspective for analyzing critical success factors of information systems by organizational characteristics in Korean firms. The contingent perspective includes such corporate characteristics as industry, strategy, value-added application, and corporate culture. The information technology should be introduced for firms to cope with the environment and in the introduction of information technology means that the infrastructure or ability for organizational characteristics is established. But whether the firm is successful to the introduction of information technology or not depends on its specific corporate culture. This research analyzed 25 firms in various industries, and that the domestic small and medium firms consider some issues-support of top management, for malization of standard architecture, user involvement, high quality software, etc.- as the necessary ones. It also found through ANOV A that organizational characteristics highly influences the critical success factors of IS the corporations face.
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