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국산 침엽수재의 육안 등급구분방법 및 허용응력설정에 관한 총설
공진혁 ( Jin Hyuk Kong ),정기영 ( Gi Young Jeong ) 한국목재공학회 2015 목재공학 Vol.43 No.1
본 연구에서는 국산 침엽수재의 육안 등급구분과 허용응력설정에 관한 국내의 학술논문을 정리하였다. 국립산림과학원 고시(KFRI 1995-27, KFRI 2000-39, KFRI 2007-3, KFRI 2009-1)를 활용하여 국산 낙엽송재의 육안 등급 구분한 연구를 비교한 결과 등급구분 비율이 연구자마다 상이했다. 보다 신뢰할 수 있는 등급구분 분류를 위해서 공증된 목재이용 기관에서 숙련된 연구자에 의한 등급구분을 시행하여야 할 것으로 사료된다. 허용응력설정에 관한 연구를 고찰한 결과, 연구자 마다 허용응력산출 방법이 ASTM D 245, KS F 2152, JAS 1990으로 모두 상이했다. 이는 침엽수 구조용재(KS F 3020)에서 기준허용응력을 제시하고 있지만 허용응력을 산출하는 명확한 방법이 제시되어 있지 않기 때문인 것으로 나타났다. 따라서 공식적인 허용응력 결정방법이 제정되어야 할 것으로 사료된다. The goal of this study was to review the visual grading and allowable stress determination methodologies for the domestic softwood. Previous studies used different grading (KFRI 1995-27, KFRI 2000-39, KFRI 2007-3, KFRI 2009-1) and allowable stress determination methodologies (ASTM D 245, KS F 2152, JAS 1990). The results of the visual grading were different by each researcher. Compared to the 1st grade proportion from the previous studies using the previous specification on visual grading (KFRI 1995-2007), a higher 1st grade proportion was found from the studies using the current specification (KFRI 2009). Compared to the allowable stress values from the small clear sample, the higher allowable stress values from the structural size were found. The results indicated that the strength reduction factor used in small clear sample was too conservative for the different grades. To obtain consistent results for the grade, it is required to have experts in visual grading and authorized organizations. An official standard methodology for the allowable stress value determination needs to be defined for the reliable stress value.
[동력전달계부문] 동력전달계 동적 특성 해석을 위한 서브 시스템 조합 알고리즘
공진혁(Jinhyung Kong),임원식(Won Sik Lim),박영일(Young Il Park),이장무(Jang Moo Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
This paper presents the main algorithms of POT AS-MSM (Power Transmission Analysis Software for Multi-Slipping Mechanism), which are based on the concept of subsystem assemble and the self-determination technique for the system degree-of-freedom. This software allows users to quickly and easily model the various and complex configurations of power transmission systems and their components. With these dynamic models, the program can be used to evaluate system performances, transient phenomena such as shift, and other dynamic problems. The program has a features to effectively handle nonlinear model, to quickly examine the various changes of system behavior caused by design modification, and to stably respond to arbitrary operating conditions or control logics. The ability of the developed program is demonstrated through the simulations and the experiments of an example transmission system.
정기영(Jeong, Gi Young),공진혁(Kong, Jin Hyuk),송진규(Song, Jin Kyu) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.5
The goal of this study is to review on the previous studies of mechanical behaviors of traditional wood to wood connections. The load carrying capacity of various types of wood to wood connections was investigated. The highest load carrying capacity of 26.67kN was found from goose neck connection, whereas the lowest load carrying capacity of 0.82kN was found from end lap connection. Comparing the moment carrying capacity of dovetail and sagae joints, the sagae joint showed a higher moment value. However, the direct comparison from the different wood to wood connections was limited due to the different size, species, geometry of tenon and mortise, and different testing methodologies. To apply the wood to wood connection to the modern buildings, optimized geometries of tenon and mortise for the wood to wood connection should be established to obtain the highest structural performance. Also, standardized testing methodologies should be used to accumulate the structural design data.
페놀레조시놀공축합수지로 접착된 국산 잣나무의 목리방향별 전단성능평가
박선향 ( Sun-Hyang Park ),김광모 ( Kwang-Mo Kim ),방성준 ( Sung-Joon Pang ),공진혁 ( Jin Hyuk Kong ),이상준 ( Sang-Joon Lee ) 한국목재공학회 2017 목재공학 Vol.45 No.3
본 연구는 국산 잣나무를 활용한 구조용집성판(cross laminated timber; CLT) 제조 기술 확립을 위한 일환으로 구조 용집성판 제작 시 접착조건을 구명하기 위해 수행되었다. 페놀레조시놀공축합수지(phenol resorcinol formaldehyde; PRF) 접착제를 적용하여 도포량과 압체압력 조건을 달리하여 목리가 수직 또는 수평한 경우의 전단시험에 의해 접착 강도를 확인하였다. 실험결과, 적정 접착조건은 도포량 250 g/㎡, 압체압력 0.8 MPa로 결정하였다. 목리방향별 접착력에 있어서는 목리를 수직방향으로 접착할 때 평행하게 접착된 경우보다 낮은 값을 보였다. 이는 목리를 수직방향으로 접착한 시험편의 경우 다수가 롤링전단에 의해 파괴된 것과 연관이 있는 것으로 판단되었다. 한편 목리가 수평한 방향으로 접착된 경우, 국내외 기준에서 제시하고 있는 전단접착 강도 기준을 만족하였으며 목리가 수직한 방향으로 접착한 경우 국외 기준에 제시된 기준을 만족하였다. 본 연구에서 도출된 최적 접착조건을 적용하여 국산 잣나무 구조용집성판 제조 시 국내외 기준에 준하는 접착성능 확보가 가능할 것이며, 또한 도출 데이터는 구조용집성판 및 구조용집성재 제조 시 참고 데이터로 활용될 수 있을 것이다. This study was performed to find out the optimum adhesive conditions on manufacturing a cross-laminated timber (hereinafter CLT) with using domestic Korean Pine (Pinus koraiensis). The adhesive conditions including a applied amount of the glue and a Pressure are the one of the most important key factors on establishing CLT production process. The shear strength was examined with differing the adhesive conditions while using Phenol Resorcinol Formaldehyde Resin Adhesive (PRF resin). The optimum adhesive conditions was confirmed to be: glue spread of 250 g/㎡ and Pressure of 0.8 MPa respectively. The grain directions of glued specimens were also considered, perpendicularly bonded and parallelly bonded groups. Shear strength of the former group showed lower values than the latter group which is considered to be the effect of a rolling shear. Meanwhile the shear strength of both group satisfied the Korean Standard (KS F 3021) and the European Standard (EN 14080 and EN 16351). The results derived from this study can be used as the basic data for manufacturing the CLT with domestic Korean Pine. And additional researches for the other species including domestic Korean Larch and Pitch Pine is also now being performed.