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오늘 본 자료
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
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.
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.
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.
Study on Young's Modulus of Geomaterials used in Korean Railway Infrastructures
Lee, Sung Jin,Lee, Seong Hyeok,Lee, Il Wha,Hwang, Su Beom,Kim, Ki Jae The Korean Society for Railway 2013 International Journal of Railway Vol.6 No.2
In this study, cyclic triaxial tests were carried out with the coarse granular materials used in Korean railway infrastructure (reinforced trackbed, gravel of transition zone, upper subgrade of railway) and Young's modulus for the target materials in small strain level were suggested. And the result of elastic modulus suggested in this study is expected to be effectively applied to dynamic analysis of the railway embankment structure using similar material, since the grain size distributions and unit weight of the material tested in this study are specified in Korean Railway Design Criteria.
Lee, Seoung Hee,Park, Hye Soon,Lee, Jung Ah,Song, Young Sook,Jang, Yeon Jin,Kim, Jong-Hyeok,Lee, Yeon Ji,Heo, Yoonseok Rapid Communications of Oxford 2013 Obesity surgery Vol.23 No.4
<P>Limited data are available on the in vivo expression of fibronectin, one of the main extracellular matrix components. We investigated the expression of fibronectin in abdominal visceral adipose tissue (VAT) and subcutaneous adipose tissue (SAT) and the associations of leptin, adiponectin, and vaspin gene expression with metabolic parameters in obese women.</P>