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편심유공합성보의 종국내력 및 변형능력에 관한 실험적 연구
최산호,서성연,Choi, San Ho,Seo, Seong Yeon 한국강구조학회 2000 韓國鋼構造學會 論文集 Vol.12 No.5
유공합성보는 공기조화설비등의 각종 배관으로 인한 용적률의 저하를 완화할 수 있고, 바람과 같은 수평력에 의한 층모멘트 감소등의 구조적 측면에서도 유용하다. 또한 휨강성도 증가되어 하중에 의한 처짐이 적어지고 진동하중이나 충격하중에도 유리하게 되어 건축물의 강성 및 내력을 높이기 위해 사용되고 있다. 그러나 개구부 위치 및 편심여부에 따라 외력에 대한 구조적인 거동이 달라지게 되므로 이에 대한 적절한 검토가 요구된다. 이에 본 논문은 편심유공합성보의 종국내력 및 변형능력에 관한 실험적 연구로서, 무공합성보인 기준시험체와 중심 및 상 하 편심유공합성보 시험체의 실험 및 이론적 고찰을 통하여 각 시험체들의 항복 및 최대내력, 휨 및 전단강성, 개구부주위의 응력분포, 그리고 모멘트-전단력 상관관계등의 구조적 특성을 규명코자 한다. Web openings of large beams provide space for wiring, piping, and duct work to provide for proper drainage, pipes and duct must be slightly sloped with the attendant result that all web openings can not be centered on the centroidal axes of the beams. Test specimens are made for opening-depth to beam-depth ratio of 0.5 and for eccentricities of the opening center line of 10% from middepth of the beam because of the proximity of the opening edge to the flange. In this paper, available test results and theories relating to the strength of composite beams having eccentric rectangular openings are surveyed and experiments were carried out to examine the structural behaviors. In all the tests in this paper good agreement is demonstrated with maximum loads measured in tests, and observed failure modes Furthermore, compared with analytical values and experimental values of interaction diagram between moment and shear capacity were safed as it is scattered with outer part of the analytical values.
복부 및 사지 부위의 전기침 자극이 전두근에서 측정한 SEMG 변화에 미치는 영향 - 자율신경계의 변화에 대한 임상적 접근을 위한 사전 연구 -
제준태,최산호,신선호,임진영,이상관,Je, Jun-Tae,Choi, San-Ho,Shin, Sun-Ho,Lim, Jin-Young,Lee, Sang-Kwan 대한한방내과학회 2012 大韓韓方內科學會誌 Vol.33 No.1
Objectives : To observe physiological changes during clinical acupuncture treatment. Methods : We recruited 40 healthy volunteers who had experienced an acupuncture treatment at least once within the past three years. The experimental group was divided into four groups according to the needling site and frequency of electrical stimulation. Sites consisted of abdomen and legs. Frequencies consisted of 100 Hz and 2 Hz. The procedures of experimental treatment consisted of seven phases, Resting I phase (Resting I), Needle insertion phase (Insertion), Maintenance of needle insertion I phase (Maintain I), Electrical stimulation phase (ES), Maintenance of needle insertion II phase (Maintain II), Needle removal phase (Removal) and Resting II phase (Resting II). We measured the surface electromygraphy (SEMG) through an electrode on the frontalis muscle during all phases consecutively. Results : When SEMGs of all seven phases were analyzed, they significantly increased or decreased according to phases. SEMGs of Insertion, Maintain I, ES and Maintain II phase significantly increased more than RestingI in abdomen and legs groups. SEMGs of the abdomen group were measured as being $4.78{\pm}0.74{\mu}V$ on Resting I, $16.48{\pm}3.97{\mu}V$ on Insertion, $46.31{\pm}10.56{\mu}V$ on Maintain I, $45.88{\pm}9.72{\mu}V$ on ES, $45.56{\pm}9.69{\mu}V$ on Maintain II, $18.76{\pm}3.05{\mu}V$ on Removal, and $3.75{\pm}0.65{\mu}V$ on Resting II. SEMGs of the legs group were measured as being $3.34{\pm}0.35{\mu}V$ on Resting I, $12.11{\pm}1.76{\mu}V$ on Insertion, $36.74{\pm}6.99{\mu}V$ on Maintain I, $33.57{\pm}6.30{\mu}V$ on ES, $32.66{\pm}6.03{\mu}V$ on Maintain II, $14.08{\pm}2.15{\mu}V$ on Removal, and $2.88{\pm}0.32{\mu}V$ on Resting II. Conclusions : SEMG changed differently according to processes of acupuncture. Electrical stimulation showed different change of SEMG. Thus, acupuncture treatment may change the status of the autonomic nervous system.
Pil Jung Kim(金弼中),San Ho Choi(崔山鎬),Young Sung Yang(梁永晟),Kyu Suk Kim(金圭石),Suk Jung Kim(金錫中) 강원대학교 산업기술연구소 1991 産業技術硏究 Vol.11 No.-
A model for the strength of composite beams with reinforced web openings is presented. All of the models are based on the static theorem of ultimate strength of reinforced rectangular perforated composite beam and is compared to the test.
폭-두께비에 관한 냉간성형 각형강관부재의 내력 및 변형능력에 관한 실험적 연구
서성연(Seong Yeon Seo),최산호(San Ho Choi),김규석(Kyu Suk Kim) 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.2
This paper is the experimental study on the member characteristics of cold-formed square short columns. On short columns under uniform compression, yield strength, maximum strength and deformation capacity have particular relation to d/t ratio. In this paper, through compression test of short columns concerning d/t ratio, we investigated the local buckling strength, yield strength, maximum strength and plastic deformation capacity of members.
열압 성형법에 의한 폐목재-플라스틱 복합패널의 기초적 성질
최낙운(Nak-Woon Choi),문경주(Kyoung-Ju Mun),최산호(San-Ho Choi) 유기성자원학회 2004 유기물자원화 Vol.12 No.4
본 연구에서는 가연성 건설폐기물 재활용의 일환으로, 폐발포폴리스티렌의 스티렌 용액에 가교제 및 개시제를 첨가하여 제조한 결합재와, 폐목재 칩을 이용하여, 폐목재-플라스틱 복합패널을 제조하였다. 전열프레스를 이용하여 다양한 결합재량 및 충전재-결합재 비를 갖는 복합패널 공시체를 제조하였으며, 그 겉보기 밀도, 흡수율, 흡수에 의한 팽창률, 휨강도, 내수성 등에 관한 일련의 실험을 행하였다. 폐목재-플라스틱 복합패널의 겉보기밀도는 결합재량 및 충전재-결합재비의 증가에 따라 증대하며, 그 휨강도 및 습윤 휨강도는, 결합재량 35%, 충전재-결합재비 0.8에 있어서 최대치에 이른다. 흡수율 및 흡수에 의한 두께 팽창률은, 결합재량 및 충전재-결합재비의 증가에 따라 현저하게 감소한다. 결합재량 30%이상의 경우, 충전재 -결합재비에 관계없이, 복합패널의 24h 상온 수중(20℃) 침지 및 2h 끓는 물중(100℃)+1h상온 수중(20℃) 침지에 의한 휨강도의 감소는 거의 발생하지 않으며, 높은 내수성을 발현한다 A styrene solution of waste expanded polystyrene with a crosslinking agent and an initiator was used as a binder for waste wood-plastic composite panels. The waste wood-plastic composite panels are prepared with various binder contents and filler-binder ratios by using a hot press molding method. The apparent density of the composite panels is increased with increasing binder content and filler-binder ratio, while their water absorption and expansion in thickness are decreased with increasing binder content and filler-binder ratio. The maximum flexural strength and wet flexural strength of the composite panels are obtained at a binder content of 35% and a filler-binder ratio of 0.8. Decreases in the flexural strengths of the composite panels due to water immersion at 20 and 100℃ are hardly recognized at binder contents of 30% or more
김규석(Kyu Suk Kim),양영성(Young Sung Yang),최산호(San Ho Choi),김필중(Pil Jung Kim) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.3
This paper is to study experimentally the ultimate strength of reinforced perforated composite beams. One perforated steel beam, one normal composite beam, two perforated composite beams and two composite beams with reinforced web openings according to the opening to the opening shape ratio. Moment-shear ratio was 330. Opening depth was 70% of steel beam depth. As the result, we could find out the following conclusions : 1. The concert slab in composite beam can increase up so much the strength of the beams. 2. By using reinforcement in the vicinity of openings, the ultimate strength of composite beams with web opening can increase up to that of composite beams without web openings. 3. The ultimate strength of perforated composite beams according to the moment-shear ratio was little concerned with opening length.
崔山鎬,梁永晟,金圭石,金錫中,金弼中 江原大學校 産業技術硏究所 1991 産業技術硏究 Vol.11 No.-
A model for the strenghth of composite beams with reinfforced web openings is presented. All of theh models are based on the static theorem of ultimated strength of reinforced rectangular perforated composite beam and is compared to the test.