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스포오츠訓練의 科學的 硏究 : 인타아발 트레이닝과 웨이트 트레이닝에 對하여
金泰植 東亞大學校 1967 東亞論叢 Vol.4 No.-
This study is a lecture by sports doctor H Reindell which was given at the world field and track events couch's conference in est germanyin march, 1964. Its contents are physical conditions is in order to succeed in long distance running and marathon. The physical strength of spurting in long distance running and marathoning is a muscle power and speed and more over muscle endurance. This muscle endurance depends on the antbreak of oxygenless energy. Here is the focus of the study of how to build rysical strength.
남자 초·중학생의 무산소성 작업능력과 무산소성 파워의 관계
정동식,정덕조,정성태,이병근,전태원,김은혜,이동규,정동춘 師範大學 體育硏究所 1998 서울大學校 體育硏究所論集 Vol.19 No.2
The critical power(CP) is the highest intensity to sustain for a long time without a fatigue. The anaerobic work capacity(AWC) is the highest anaerobic capacity to be provided by anaerobic energy system without the infection of hypoxia. The purpose of this study was to determine the relationship between AWC and AnP and to verify the validity of AWC. The subjects were consisted of 10 elementary and 10 middle school male students(12.8±1.3yrs, 159.3±12.1㎝, 49.4±11.8㎏). The critical power and anaerobic work capacity were calculated by work-time relationship after four cycle ergometry test to fatigue from 1 to 10 minute. The anaerobic power included Margaria-Kalmen test, Sargent jump and Wingate test. The main finding were as follows. The AWC of elementary and middle school students. were 6.47±2.63KJ and 11.10±3.01KJ. The AWC of elementary students was 58.3% of the middle school students's one. The AnP of elementary students were 47.2∼66.5% of the middle school students's one. And there were high correlation between AWC and AnP(0.64∼0.87, P<0.01). This study showed that AWC is useful index on AnP both elementary and middle school students.
Magnetic Tunnel Junctions with AlN and AlO Barriers
Tae Sick Yoon,Satoru Yoshimura,Masakiyo Tsunoda,Migaku Takahashi,Bum Chan Park,Young Woo Lee,Ying Li,Chong Oh Kim 한국자기학회 2004 Journal of Magnetics Vol.9 No.1
We studied the magnetotransport properties of tunnel junctions with AlO and AlN barriers fabricated using microwave-excited plasma. The plasma nitridation process provided wider controllability than the plasma oxidization for the formation of MTJs with ultra-thin insulating layer, because of the slow nitriding rate of metal Al layers, comparing with the oxidizing rate of them. High tunnel magnetoresistance (TMR) ratios of 49 and 44% with respective resistance-area product (R × A) of 3 × 10⁴ and 6 × 10³ Ωμ㎡ were obtained in the Co-Fe/Al- N/Co-Fe MTJs. We conclude that AlN is a hopeful barrier material to realize MTJs with high TMR ratio and low R × A for high performance MRAM cells. In addition, in order to clarify the annealing temperature dependence of TMR, the local transport properties were measured for Ta 50 Å/Cu 200 Å/Ta 50 Å/Ni_(76)Fe₂₄ 20 Å/Cu 50 Å/Mn_(75)Ir_(25) 100 Å/Co_(71)Fe_(29) 40 Å/Al-O junction with d_(Al) = 8 Å and P_(O2) × t_(OX) = 8.4 × 10⁴ L at various temperatures. The current histogram statistically calculated from the electrical current image was well in accord with the fitting result considering the Gaussian distribution and Fowler-Nordheim equation. After annealing at 340 ℃, where the TMR ratio of the corresponding MTJ had the maximum value of 44%, the average barrier height increased to 1.12 eV and its standard deviation decreased to 0.1 eV. The increase of TMR ratio after annealing could be well explained by the enhancement of the average barrier height and the reduction of its fluctuation.
마이크로파 여기 프라즈마법으로 제조한 강자성 터널링 접합의 국소전도특성
윤대식(Tae Sick Yoon),김철기(Cheol Gi Kim),김종오(Chong-Oh Kim),Masakiyo Tsunoda(Masakiyo Tsunoda),Migaku Takahashi(Migaku Takahashi),Ying Li(Ying Li) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.2
Ferromagnetic tunnel junctions were fabricated by dc magnetron sputtering and plasma oxidation process. The local transport properties of the ferromagnetic tunnel junctions were studied using contact-mode Atomic Force Microscopy (AFM) and the local current-voltage analysis. Tunnel junctions with the structure of sub./Ta/Cu/Ta/NiFe/Cu/Mn_(75)Ir_(25)/Co_(70)Fe_(30)/Al-oxide were prepared on thermally oxidized Si wafers. Al-oxide layers were formed with microwave excited plasma using radial line slot antenna (RLSA) for 5 and 7 sec. Kr gas was used as the inert gas mixed with O₂ gas for the plasma oxidization. No correlation between topography and current image was observed while they were measured simultaneously. The local current distribution was well identified with the distribution of local barrier height. Assuming the gaussian distribution of the local barrier height, the ferromagnetic tunnel junction with longer oxidation time was well fitted with the experimental results. As contrast, in the case of the shorter time oxidation junction, the current mainly flow through the low barrier height area for its insufficient oxygen. Such leakage current might result in the decrease of tunnel magnetoresistance (TMR) ratio.