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김도준,김형주 龍仁大學校 武道硏究所 2004 武道硏究所誌 Vol.15 No.1
In order to find if there are any differences in techniques and scores of Judo matches by height and weight of athletes, video tapes and records of 120 matches by 544 male Judo players who participated in the 2nd Tamra National Judo Championships were examined, which resulted in the following outcomes: 1. It was found that light weight players tend to use frequently such techniques as Ashi-Waza, Te-Waza and Osae-Komi-Waza in sequence with higher probability to win when they fought with those smaller in height(p〈.001). In contrary, when they fought with those similar to or. taller in height than themselves, they rather used Te-Waza, Ashi-Waza and Koshi-Waza in the order of frequency(p〈.001). 2. In case of middle weight players, they favored to use frequently techniques such as Ashi-Waza, Te-Waza, Osae-Komi-Waza and Koshi-Waza in order with more probability to win when they fought with smaller opponents(p〈.001). In contrary, however, when they fought with those similar to or taller in height than themselves, they tried to use Ashi-Waza, Te-Waza, Osae-Komi-Waza and Koshi-Waza in the order of frequency significantly(p〈.001). 3. Heavy weight players were found to attach frequently to such techniques as Ashi-Waza, Osae-Komi-Waza, Te-Waza and Koshi-Waza in sequence with possibility to get higher scores when they fought with smaller competitors(p〈.001). In contrast, when they fought with those similar to or taller in height than themselves, they tended to use Te-Waza, Ashi-Waza, Osae-Komi-Waza and Koshi-Waza in order, but the order of probability to win higher scores turned out to be Ashi-Waza, Te-Waza, Osae-Komi-Waza and Koshi-Waza(p〈.001). From the above findings, it became evident that Te-Waza, particularly Seoinage as a kind of Sutemi-Waza, was used most frequently regardless the difference of weight and height. In case, however, the competitor was smaller than the player himself, Ashi-Waza was favored. Among keeping techniques, Osae-Komi- Waza was frequently used, while Ma-Sutemi-Waza, Koshi-Waza, Shime-Waza and Kansetsu-Waza were rarely used compared to other Sutemi-Waza. Based on this study, it would be recommended for those who want to be good players to acquire effectively those techniques that are fit to their own physical conditions like weight and height and to develop new techniques that can defend themselves more effectively through sys0tematic and continuous training programs.
Metal Oxide Sensor Array를 이용한 사과와 귤의 신선도 분석
임향주,한도수,조성동,김기윤 조선대학교 기초과학연구소 2000 自然科學硏究 Vol.23 No.1
The Electronic Nose has been designed to provide objective and reproducible aroma discrimination on a wide variety to human nose. The sensor array in combination with sophisticated chemometrics and artificial neural network software provides the output displaying the closeness of difference in aroma patterns of different samples. As an application the system has been used to discriminate of the fresh and decomposing apples and oranges. The discrimination has been successfully demonstrated.
사용자 수술명과 수술분류 code(ICD-9-CM) 일치율 향상에 관한 연구 : 수술실 OCS program 사용 활성화를 통하여
최향하,김미영,김도진,유지원,장정화,박수정,박재성 한국의료QA학회 2005 한국의료질향상학회지 Vol.12 No.1
Background : The necessity of unify and standardize codes used at hospital has been emphasized since OCS (Order Communicating System) was adopted. Therefore, the purpose of this study were to standardize operation code by continuous training of the ICD-9-CM code that is used as standard code in OCS program at operating room. Method : In 400 operation data, operation code entered in OCS program at operating room was compared to operation name recorded in medical record. In addition, a matching rate between input data of operation code by medical record department and computing input data of operation code in 3,710 cases was compared for each department. User operation name and operation code were matched and major diagnosis by operation department and operation name were also matched. Results : User operation name was reflected in operation classification code in detail, and operation code entered on user was registered. Input rate and matching rate of operation code were gradually improved after improvement activity. In particular, a matching rate was high at ophthalmology where operation name is segmented. Plastic surgery and orthopedics with a lot of emergency operation and comprehensive operation name show low input rates. Conclusions : As the medical field makes progress in computerlization, awareness of information exchange and sharing becomes higher. Among codes to classified medical institution, codes related to surgical operation are all different by user of hospital and department. Computerlization and standardization is essential. And when efforts of standardization continue in alliance with individual hospital and institution, initiative of preparing medical policy data at a national level will be accelerated.
준결정상을 포함한 Mg-Zn-Y 합금의 기계적 특성 및 부식 저항성
김도형 ( Do Hyung Kim ),김원태 ( Won Tae Kim ),김도향 ( Do Hyang Kim ),김영균 ( Young Kyun Kim ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.2
Mechanical and property corrosion resistance of Mg-Zn-Y alloys with an atomic ratio of Zn/Y of 6.8 are investigated using optical microscopy, scanning electron microscopy, transmission electron microscopy, uniaxial tensile test and corrosion test with immersion and dynamic potentiometric tests. The alloys showed an in-situ composite microstructure consisting of α-Mg and icosahedral phase (I-phase) as a strengthening phase. As the volume fraction of the I-phase increases, the yield and tensile strengths of the alloys increase while maintaining large elongation (26~30%), indicating that I-phase is effective for strengthening and forms a stable interface with surrounding α-Mg matrix. The presence of I-phase having higher corrosion potential than α-Mg, decreased the corrosion rate of the cast alloy up to I-phase volume fraction of 3.7%. However further increase in the volume fraction of the I-phase deteriorates the corrosion resistance due to enhanced internal galvanic corrosion cell between α-Mg and I-phase.
Microstructure and Wear Characteristics of Si Particulate Reinforced al Matrix composites
Kim, Do Hyang,SONG, Suk Jin,KIM, Jun Su 대한금속재료학회(대한금속학회) 1997 METALS AND MATERIALS International Vol.3 No.4
In order to obtain a homogeneous distribution of fine Si particles in aluminium matrix and thus to improve the adaptability of Al-Si alloy for aerospace and automobile applications, Si particulate reinforced aluminium matrix composites have been processed by using powder metallurgy method. The Si pariticulates with 20-40 ㎛ size and A1 alloy powders were mixed, degassed and extruded at 350℃ or 400℃ depending on the composition of the matrix alloy. The microstructural characteristics of the composites such as interfacial stability at high temperatures have been investigated by various experimental techniques. Wear properties of the composites were investigated by using a pin-on-disk type wear tester. The results were compared with these obtained from the conventionally cast hypereutectic Al-Si alloys and discussed in terms of the observed microstructural characteristics and physical properties such as hardness and tensile properties.
Formation of Amorphous Oxide Layer on the Crystalline Al-Ni-Y Alloy
Kim, Kang Cheol,Kim, Won Tae,Kim, Do Hyang Korean Society of Microscopy 2013 Applied microscopy Vol.43 No.4
The oxidation behavior of the crystallized $Al_{87}Ni_3Y_{10}$ alloy has been investigated with an aim to compare with that of the amorphous $Al_{87}Ni_3Y_{10}$ alloy. The oxidation at 873 K occurs as follows: (1) growth of an amorphous aluminum-yttrium oxide layer (~10 nm) after heating up to 873 K; and (2) formation of $YAlO_3$ crystalline oxide (~220 nm) after annealing for 30 hours at 873 K. Such an overall oxidation step indicates that the oxidation behavior in the crystallized $Al_{87}Ni_3Y_{10}$ alloy occurs in the same way as in the amorphous $Al_{87}Ni_3Y_{10}$ alloy. The simultaneous presence of aluminum and yttrium in the oxide layer significantly enhances the thermal stability of the amorphous structure in the oxide phase. Since the structure of aluminum-yttrium oxide is dense due to the large difference in ionic radius between aluminum and yttrium ions, the diffusion of oxygen ion through the amorphous oxide layer is limited thus stabilizing the amorphous structure of the oxide phase.
Synthesis of Amorphous Matrix Nano-composite in Al-Cu-Mg Alloy
Kim, Kang Cheol,Park, Sung Hyun,Na, Min Young,Kim, Won Tae,Kim, Do Hyang Korean Society of Microscopy 2014 Applied microscopy Vol.44 No.3
The microstructure of as-quenched $Al_{70}Cu_{18}Mg_{12}$ alloy has been investigated in detail using transmission electron microscopy. Al nano-crystals about 5 nm with a high density are distributed in the amorphous matrix, indicating amorphous matrix nano-composite can be synthesized in Al-Cu-Mg alloy. The high density of Al nano-crystals indicates very high nucleation rate and sluggish growth rate during crystallization possibly due to limited diffusion rate of solute atoms of Cu and Mg during solute partitioning. The result of hardness measurement shows that the mechanical properties can be improved by designing a nano-composite structure where nanometer scale crystals are embedded in the amorphous matrix.