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End Distance of Single-shear Screw Connection in Cross Laminated Timber
Jung-kwon Oh,Gwang-chul Kim,Kwang-mo Kim,Jun-jae Lee,Jung-pyo Hong 한국목재공학회 2017 목재공학 Vol.45 No.6
Cross-laminated timber (CLT) is a relatively new engineered wood for timber construction. It is a great shear wall material. It was known that the shear performance of the CLT wall depends on the performance of connections. In connection, nail or screw has to be installed with a certain distance from the end of the timber. Current building code specifies the distance on the name of end distance. The end distance was decided as a minimum distance not to make splitting or tearing out in lumber or glued laminated timber. As a relatively new engineered wood, the end distance of CLT connection need to be identified because CLT is cross-wisely glued lumber products like plywood. Different from glued laminated timber or lumber, cross layer of CLT may pre-vent wood from splitting or tearing-out. As a result, the end distance of CLT was expected to be reduced than glued laminated timber. The shorter end distance may let more versatile connector design possible. In this study, prior to developing novel connection for CLT, the end distance of CLT connection was experimentally inves-tigated to identify the end distance limitation. The experiments showed that the end distance can be reduced from 7D to 6D, in case of the tested CLT combination and screw in this study.
몬테 카를로 시뮬레이션을 이용한 소나무 탄소배출계수의 불확도 평가
표정기 ( Jung Kee Pyo ),손영모 ( Yeong Mo Son ),장광민 ( Gwang Min Jang ),이영진 ( Young Jin Lee ) 한국산림과학회 2013 한국산림과학회지 Vol.102 No.4
The purpose of this study was to calculate uncertainty of emission factor collected data and to evaluate the applicability of Monte Carlo simulation technique. To estimate the distribution of emission factors (Such as Basic wood density, Biomass expansion factor, and Root-to-shoot ratio), four probability density functions (Normal, Lognormal, Gamma, and Weibull) were used. The two sample Kolmogorov-Smirnov test and cumulative density figure were used to compare the optimal probability density function. It was observed that the basic wood density showed the gamma distribution, the biomass expansion factor results the log-normal distribution, and root-shoot ratio showd the normal distribution for Pinus densiflora in the Gangwon region; the basic wood density was the normal distribution, the biomass expansion factor was the gamma distribution, and root-shoot ratio was the gamma distribution for Pinus densiflora in the central region, respectively. The uncertainty assessment of emission factor were upper 62.1%, lower -52.6% for Pinus densiflora in the Gangwon region and upper 43.9%, lower -34.5% for Pinus densiflora in the central region, respectively.
Lysophosphatidylethanolamine delays fruit softening of persimmon (Diospyros kaki)
Jihye Jung,Young-Pyo Lee,Sung-Woo Bae,Gwang-Hwan Ahn,Stephen Beungtae Ryu 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.4
We investigated the possibility of prolonging the freshness of persimmons ( Diospyros kaki ) for overseas export. Previous studies aimed at improving the shelf life of harvested persimmons focused on the synthetic gas 1-MCP, an inhibitor of ethylene perception. In this study, the natural lipid compound lysophosphatidylethanolamine (LPE) was applied to prolong the freshness of persimmons. LPE signifi cantly delayed persimmon softening when applied not only during fruit growth, but also after harvest, or after a long period of post-harvest cold storage, simulating conditions of overseas export. LPE suppressed the expression of the softening-related genes ACS1 , ACO1 , ERF24 , DkUGD1 , DkCHI3 , and DkB - CHI1. These results reveal the eff ects of LPE on persimmon softening and the related molecular mechanisms and provide evidence that LPE can be used to delay persimmon softening.
ERP 사용자의 조직시민행동과 확장이용의도 간의 관계에 영향을 미치는 요인에 관한 연구: 흡수역량과 지각된 유용성의 매개효과를 중심으로
홍광표 ( Gwang Pyo Hong ),송정수 ( Jung Su Song ),장길상 ( Gil Sang Jang ) 한국정보시스템학회 2011 情報시스템硏究 Vol.20 No.1
This study is an empirical study on the relationships among organizational citizenship behaviors, absorptive capacity, performance of using ERP(perceived ease of use, perceived usefulness, and intention of ERP extension usage). In particular, mediating effect of absorptive capacity and perceived usefulness is empirically analysed to find causes and impacts among these variables. In order to achieve the goals of this study, research models were proposed and hypothesis were drawn to test on the basis of previous studies. A survey was conducted to the members of the seven organizations such as manufacturers, distributors and service industry. The survey questionnaires were sent to 400 people and 304 of them were returned. This data was analyzed with SPSS 12.0 and AMOS 5.0. The study results are as follows. There were no direct effects of the organizational citizenship behaviors on the performance of using ERP. The organizational citizenship behaviors had a positive effects on the absorptive capacity. The absorptive capacity had also a positive effect on the performance of using ERP and the perceived ease of use. The perceived ease of use had a positive effect on the perceived usefulness and the intention of ERP extension usage. Futhermore, the perceived usefulness had a positive effect on the intention of ERP extension usage. In addition, there was a full mediating effect of the absorptive capacity on between the organizational citizenship behaviors and the performance of using ERP. The perceived usefulness had a partial mediating effect on between the perceived ease of use and the intention of ERP extension usage.
산업용 Roll Heat-Up 표면연소버너 시스템 개발
정윤식(Jung Yun Sik),고광수(Goh Gwang Soo),김시완(Kim Si Wan),조일현(Cho Il Hyun),최승표(Choi Seung Pyo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Metal fiber burner system for industrial roll heat-up is developed by POSCO in Pohang Works. Rolls had been heated up for 3~4 hours by hot materials whose temperature was about 700℃. The methodology of roll heat-up using hot materials caused several problems; 1. hot materials loss, 2. clogging of dust collector 3. roll0’s thermal stress. The alternative is an application of metal fiber burner system to solve these problems. Initial test that was as similar as operating circumstances of actual industrial roll was carried out to verify the application of metal fiber burner system. According to analysis of heat transfer based on the test, roll heating time and distance between metal fiber burner and roll are determined as 90 minutes and 80㎜ respectively. Four real tests in operating roll with metal fiber burner have been succeeded. POSCO establishes the operating technology for industrial roll heat-up.
Sol Gel 방법으로 제조한 Al0.2CoFe1.8O₄ 분말과 박막의 열처리 효과
채광표(Kwang Pyo Chae),이재광(Jae-Gwang Lee),권혁수(Hyuck Su Kweon),김정훈(Jung Hoon Kim),이영배(Young Bae Lee) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.3
The Al_(0.2)CoFe_(1.8)O₄ ferrite films and powders were prepared by the sol-gel method. The crystallographic and magnetic properties of the samples were examined with annealing temperature by X-ray diffraction, Mossbauer spetroscopy and vibrating sample magnetometry. The powder samples showed the presence of spinel structure at annealing temperatures above 673 K, while the film samples indicated the spinel structure above 873 K, also the particle size increased with rising annealing temperatures. The Mossbauer spectra of Al_(0.2)CoFe_(1.8)O₄ powder annealed above 873 K could be fitted as the superposition of two Zeeman sextets due to ferrimagnetic phase. And the spectra of annealed at 673 K exhibited the superposition of ferrimanetic and paramagnetic phase and those of annealed at 473 K showed only a paramagnetic phase. The magnetic behaviour of powders appeared that the coercivity increased until annealed at 673 K but decreased above this temperature. The coercivity of the film samples decreased from 1.084 kOe at 873 K to 0.540 kOe at 1073 K with increasing annealing temperatures.
Inpyo Jeon,Gwang Pyo Jung,서한길,Ju Seok Ryu,Tai Ryoon Han,Byung-Mo Oh 대한재활의학회 2019 Annals of Rehabilitation Medicine Vol.43 No.2
Objective To investigate the proportion of aspiration pneumonia cases among patients with community-acquired pneumonia in Korea.Methods This retrospective study included patients with community-acquired pneumonia who had been admitted to the emergency department of a university-affiliated tertiary hospital in Gyeonggi Province, Korea between January 1, 2016 and December 31, 2016. Among these patients, those with aspiration pneumonia were identified using ICD-10 codes (J69.*). Patients with recurrent pneumonia were excluded, as were those who were immunocompromised. The proportion of cases of aspiration pneumonia was calculated, and the characteristics and clinical outcomes of patients with aspiration pneumonia and non-aspiration pneumonia were compared. Results The proportion of aspiration pneumonia cases among patients with community-acquired pneumonia was 14.2%. Patients with aspiration pneumonia were significantly more likely to be older (p<0.001) and male (p<0.001), and to have a higher confusion, uremia, respiratory rate, blood pressure, and age ≥65 years (CURB-65) score (p<0.001) as compared to patients with non-aspiration pneumonia. They were also more likely to require admission to the intensive care unit (p<0.001) and a longer hospital stay (p<0.001). Conclusion Aspiration pneumonia accounts for 14.2% of all cases of community-acquired pneumonia in Korea. These data may contribute to the establishment of healthcare strategies for managing aspiration pneumonia among Korean adults.