http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
손장식,정정욱,김종호,임정수,김훈 대구대학교 기초과학연구소 2003 基礎科學硏究 Vol.19 No.3
In this study, the Wingate power test was performed to investigate of the anaerobic power output in soccer players who play in different position. The main purpose of the test was to provide the enhancement of anaerobic capacity which was conducted by comparing and analysing of the Wingate test. This will improve the performance during the soccer games. Seventeen soccer players with three different positions, FW, MF, DF, were recruited, and undertook the Wingate power test, and anaerobic power, peak power output, anaerobic capacity, and fatigue index was analysed. There was a significant effect of a peak power output among positions showing MF>DF>FW (P<.05). MF revealed the highest peak power output at 15 and 30 seconds time points compared to DF and FW. As far as the players' positions were concerned, a relative anaerobic capacity showed a similar results with a peak power output (P<.05; MF>DF>FW). Unlike with these results, the fatigue index in different positions did not show any statistical significant results (P>.05). Based on these results, it was suggested that the systematical training program is required to perform a modern soccer, pressure and total soccer, in MF players. If the physical strength, especially power out, in MF players is enhanced, the results of the soccer games will be also improved.
WEL-TEN60 母材와 熔接材의 低溫 引張 및 衝擊特性에 關한 硏究
金載勳,沈奉植,邕章祐 忠南大學校 産業技術硏究所 1987 산업기술연구논문집 Vol.2 No.2
This study was aimed to determine tensile and impact properties of base and weld metals of WEL-TEN60 of temperatures from-70℃to 70℃. It is particularly important to assess tensile properties, absorbed energy change, lateral expension ratios and fracture appearance in order to prevent brittle fracture of this material at low temperatures. The obtained results were as follow: In case of base metal, the ultimate tensile strength, yield strength and elongation increase as the temperature decreases. The weld metal showed almost the same reactions as the base metal did. The fracture morphology of base and weld metals was that of dimple fracture at all temperature ranges. The dimple size got smaller as the temperature decreased. The fact that as the temperature increased, the absorbed energy increased seemed due to the increase of loading time. The curves of fibrous fracture, lateral expansion and absorbed energy kept almost the same shape. We came to conclusion that when we applied 15 ft-1b CVN temperature, the materials are safe from brittle fracture over-70℃.
무지 외반증 환자의 hard insole 착용에 의한 중족지절관절 각도의 변화
임성태,김택훈,최흥식,노정석,김장환 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.2
The purpose of this study was to investigate the effect of donning of a hard insole in patients with hallux valgus. Fourteen subjects were selected from patients with foot pain at Lee Chang-Heon Foot Clinic from August 4,2000 to September 15, 2000. The hallux valgus angle and the first-second intermetatarsal angle were radiographically measured before and after donning the hard insole. Based on these two kinds of angles, a mild hallux valgus deformity group was characterized by the hallux valgus angle of less than 20 degrees, and a moderate hallux valgus deformity group was characterized by the hallux valgus angle of 20 to 40 degrees. After three weeks with the hard insole donned, the foot angles of the patients with hallux valgus were measured again. The data were analyzed by Wilcoxon signed ranks test, and the following results were obtained: 1) After the trial, both mild hallux valgus deformity group and moderate hallux valgus deformity group demonstrated that the hallux valgus angles were significantly decreased. 2) After the trial, mild hallux valgus deformity group demonstrated that the first-second intermetatarsal angle was significantly decreased. 3) After the trial, moderate hallux valgus deformity group demonstrated that the first-second intermetatarsal angle was not significantly decreased. The above findings revealed that according to donning hard insole, the hallux valgus angles of mild and moderate hallux valgus deformity groups and the first-second intermetatarsal angle of mild hallux valgus deformity group were significantly decreased. The results of this study have some limitation for generalization due to the limited number of subjects. Further studies are needed to evaluate the effect of hard insole on hallux valgus with more precise laboratory equipments and measurements in patients with hallux valgus.
초소형 구조물의 부착 방지를 위한 새로운 자기 집합 물질에 대한 연구
김봉환,오창훈,전국진,정택동,변장웅,이윤식 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
In order to achieve stiction-free polysilicon surfaces, we have suggested a new chemical grafting precursor and confirmed their excellent characteristics. When dichlorodimethylsilane(DDS, C_(2)H_(6)SiCl_(2)), a dialkyldichlorosilane widely used in silicon machining, have been used as a precursor, experimental results were clearly comparable to those of monoalkyltrichlorosilanes octadecyltrichlorosilane (OTS, C_(18)H_(37)SiCl_(3)) or 1H,1H,2H,2H-perfluorodecyltrichloro-silane (FDTS, C_(10)H_(4)F_(17)SiCl_(3)) in terms of stiction reduction. The polysilicon cantilevers were fabricated in the carefully controlled conditions and laser interferometer indicated that their residual stress gradient was 2 MPa/μm upward from the substrate. The SEM images of polysilicon cantilever beams with DDS coating are upward and no stiction is observed up to 2 mm in length.
Growth of spin-capable multi-walled carbon nanotubes and flexible transparent sheet films.
Jang, Hoon-Sik,Jeon, Sang Koo,Kwon, Oh-Heon,Lee, Seek Cheol,Kim, Chang Soo,Nahm, Seung Hoon American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.4
<P>Iron-catalyzed spin-capable multi-walled carbon nanotubes (MWCNTs) were grown on a SiO2 wafer by chemical vapor deposition, which was carried out at 780 degrees C using C2H2 and H2 gases. We fabricated a flexible transparent film using the spun MWCNTs. The MWCNT sheets were produced by being continuously pulled out from well-aligned MWCNTs grown on a substrate. The MWCNT sheet films were manufactured by simply carrying out direct coating on a flexible film or glass. The thickness of the sheet film decreased remarkably when alcohol was sprayed on the surface of the sheet. The alcohol spraying increased the transmittance and decreased the electrical resistance of the MWCNT sheet films. The sheets obtained after alcohol spraying had a resistance of -699 omega and a transmittance of 81%-85%. The MWCNT sheet films were heated by applying direct current. The transparent heaters showed a rapid thermal response and uniform distribution of temperature. In addition, we tested the field emission of the sheet films. The sheet films showed a turn-on voltage of -1.45 V/microm during field emission.</P>