제 1 학술분과 : 섬유강화 복합재료의 혼합모우드 층간 파괴인성 평가

윤성호,홍창선 한국복합재료학회 1988 한국복합재료학회 학술발표회 논문초록집 Vol.- No.2

나당전쟁기 칠중성 전투의 의미에 대한 고찰

윤성호 국민대학교 한국학연구소 2024 한국학논총 Vol.61 No.-

Many studies have been conducted on the process of the Silla-Tang War and individual battles. This paper focuses on the Battle of Chiljungseong, which was the starting point for Silla's victory in the Silla-Tang War. Silla aggressively attempted to territorialize Goguryeo by supporting Goguryeo Reconstruction Army on the old land of Goguryeo, where the Tang established Andong Dohobu. However, Silla was unable to maintain defense system on Goguryeo's old land .Silla suffered a crushing defeat in the Battle of Seokmun on the flatland in 672, forcing it to revise its strategy to a defensive position. Silla established a detailed defense system around the Imjin River in the process of confronting Goguryeo. Silla strengthened the existing defense line and maintained defense facilities on the main transportation routes connecting the capital. In February 675, Silla suffered damage from Tang in a battle at Chiljungseong, but the castle was not captured. And in September, when the Tang troops were prevented from landing at the Battle of Cheonseong, the main forces of the Tang were tied up in Maesoseong. Eventually, the Tang army was attacked by Silla and retreated from Maeseong, and the lead of the war was handed over to Silla. The Tang recognized Chiljungseong as a large military base in northern Silla. Silla blocked Tang's advance south at Chiljungseong, and the Tang failed to advance south by breaking through Silla's defense line. The defense line established by Silla against Goguryeo became the basis for preventing the Tang's offensive, and its historical significance can be found in that it was located at the center of it.

炭素纖維複合材料의 혼합모우드 層間破壤靭性

尹成浩,洪昌善 한국항공우주학회 1988 한국항공우주학회 학술발표회 논문집 Vol.- No.-

보 형태의 굽힘시편을 이용한 적층복합재료의 혼합모우드 층간파괴인성 평가

윤성호,홍창선 대한기계학회 1989 대한기계학회논문집 Vol.13 No.5

It this study, beam-type bend specimen is used to evaluate the interlaminar fracture toughness of laminated composite under mixed-mode deformations. The specimen is loaded under three-point bending and hence produced mixed-mode deformations in the vicinity of the crack tip according to the variation of the thickness ratio on delamination plane. Total energy release rate is obtained by elementary beam theory considering the effect of shear deformation. The partitioning of total value into mode-I and mode-II components is also performed. The mixed-mode interlaminar fracture toughness is evaluated by experiments on specimens with several thickness ratios of delamination plane. As the part of delamination plane is thicker, the effect of shear deformation on total energy release rate is increased. Beam-type bend specimen men may be applied to obtain informations on the mixed-mode interlaminar fracture behavior of laminated composites. 본 연구에서는 층간균열면에서의 보 두께비를 달리함에 따라 다양한 혼합 모우드 층간파괴인성을 평가할 수 있는 Fig.1과 같은 층간균열 시편에 대해 3점 굽힘하중 하중이 작용될 때의 전체어너지방출률을 전단변형을 고려한 보이론에 의해 유도하고 이를 층간균열면에서의 보 두께비에 따라 모우드I 성분과 모우드II 성분의 분리된 형태로 나타내었다. 또 한 여러가지 시편두께에 대해 전체에너지방출률을 구해 전단변형에 의한 에너지방출률이 전체에너지방출률에 미치는 영향도 조사하였다. 그리고 층간 균열면에서의 보 두께비가 0.3, 0.5, 0.6, 0.7, 그리고 0.9인 경우의 층간균열시편에 대해 실험적으로 혼합모우드 층간 파괴인성을 평가하고 혼합 모우드 변형을 받을 때의 층간파괴 거동도 조사하였다.

고무차륜형 AGT 주행장치의 내구성 평가

윤성호 한국전산구조공학회 1999 전산구조공학 Vol.12 No.1

High Thermomechanical Properties of Transparent UV-Curable Waterborne Polyurethane Nanocomposite

윤성호,김병규 한국고분자학회 2009 한국고분자학회 학술대회 연구논문 초록집 Vol.2009 No.10

제조물책임법의 주요내용 해설

윤성호 한국시멘트협회 1999 시멘트 Vol.151 No.-

영구자석의 척력을 이용한 자전거 완충장치 해석

윤성호,Yun, Seong-Ho 한국전산구조공학회 2016 한국전산구조공학회논문집 Vol.29 No.1

One commercial package for magnetic analysis was used to apply repulsive forces of permanent magnetics to bicycle cushion system. Reliabilities of finite element analysis were acquired by comparing with those of experimental measurements. Equivalent spring stiffnesses corresponding to various sizes of magnetics were implemented into the bicycle dynamic model with three degree of freedom. Input force caused at front and rear wheels due to road unevenness was considered in the dynamic model. Dynamic behaviors were observed in terms of vertical displacements of the rider and the front reach as well as pitching displacement of the mass center when the bicycle ran over half-triangular bump. The methodology suggested in this paper by the finite element analysis and numerical model will be an useful tool for more accurate prediction of cushion design for any vehicle system if magnetic forces are utilized.

벼 보온절충 못자리의 바람트기 방법에 따른 상내 2산화탄소 농도와 기온의 일변화

윤성호,이변우,김병찬,이정택 한국작물학회 1990 Korean journal of crop science Vol.35 No.6

터널식 보온절충못자리 육묘에서 고온장해를 막기 위한 바람트기는 묘의 광합성과 관련하여 상내 $CO_2$ 공급 또한 중요하므로 바람트기 방법에 따른 상내 온도와 $CO_2$ 농도의 낮 동안의 변화를 알아보고자 본 실험을 수행하였다. 1. 맑은 날(5월 20일)에 조사한 바람트기 방법별 상내 $CO_2$ 농도는 바람트기 방법에 따라 뚜렷한 차이를 보였는데, 무통풍이 가장 낮았고, 관행이 가장 높았으며, 가로일자찢기는 중간 정도였다. 상내 $CO_2$ 농도가 가장 낮아진 시각은 무통풍에서는 10:30시에 58ppm, 가로일자찢기에서는 15:30시에 155ppm, 관행은 17: 30시에 272ppm 이었다. 광합성이 이루어지는 낮 동안의 상내 $CO_2$의 평균 농도는 외기 15.74m ㏖/㎥에 비하여 무통풍은 3.27m ㏖/㎥, 가로일자찢기는 12.81m ㏖/㎥이었다. 2. 외기온도에 대한 상내 기온울 보면 무통풍에서 외기가 22$^{\circ}C$일 때 46$^{\circ}C$까지 높아졌으며, 이때 가로일자찢기는 37$^{\circ}C$였고, 관행은 32$^{\circ}C$였다. 상내 기온이 15$^{\circ}C$ 이하에서는 가로일자찢기가 관행보다 더 큰 보온효과를 보였다. 3. 해돋이 전 상내 기온이 1$0^{\circ}C$-15$^{\circ}C$로 비교적 낮은 때 $CO_2$ 농도는 높은 편이었지만, 해독이후 상내 기온이 2$0^{\circ}C$까지 높아지고 동시에 광합성이 이루어지게 되면 급격히 감소하다가 2$0^{\circ}C$ 이상으로 높아짐에 따라 $CO_2$ 농도는 서서히 감소하는 경향이었다. 4. 40일묘의 묘소질은 건물중, 충실도 모두 가로일자찢기에 의한 바람트기가 가장 높았고, 관행이 그 다음이었으며, 무통풍이 가장 낮았다. 5. 보온 못자리의 바람트기는 튼튼한 모기르기를 위한 보온, 고온장해 방지 , $CO_2$ 공급 등의 중요성을 동등하게 인정하고 관리하여야 할 것으로 판단된다. Diurnal courses of $CO_2$ concentration and air temperature in the rice seedbed tunnel covered with polyethylene film, subjected to three different ventilation methods, were traced. Regaredless of ventilation methods, $CO_2$ concentrations in the tunnel on a clear day were lower than that in ambient air, and vice versa before dawn. $CO_2$ concentration during the day was lowest in the tunnel with non-ventilation (NV), followed by horizontal slit ventilation (HSV) and traditional one(TN), reaching down to the lowest level of 58ppm, 155ppm and 272ppm, respectively. Air temperature in the tunnel reached 46$^{\circ}C$ in NV, 37$^{\circ}C$ in HSV and 32$^{\circ}C$ in TV at the daytime when ambient air temperature was 22$^{\circ}C$. Even at night time of ambient air temperature below 15$^{\circ}C$, HSV was more effective than TV in raising the air temperature in the tunnel. The dry weight of 40-day old seedling weighed heaviest in HSV, followed by TV and NV.

공과대학의 고체역학 교과목에 플립러닝의 적용사례

윤성호 한국공학교육학회 2019 공학교육연구 Vol.22 No.3

This study dealt with a case study on the application of flipped learning to solid mechanics in college of engineering and analyzedthe results of Pre-class survey, In-class activities, and Post-class survey to examine the effects of flipped learning. Total sample sizeof the analysis was 32 students who applied for solid mechanics in mechanical engineering department, consisting of 23 students insophomore, five in junior and four in senior. The class was operated in three stages: Pre-class, In-class, and Post-class. The responseof the students was observed at each stage of the class. According to the results, flipped learning was effective in learning knowledgeof major subjects in engineering, and students actively participated in class activities and conducted smooth discussions with team members. Flipped learning has also improved students' class concentration and academic ability. Most of the students have expressed their intentionto take classes or actively recommend other students when the classes are held. Effective classes will require systematic discussionguidance because flipped learning is closely related to discussion activities.