GdFe 박막의 증착속도에 따른 조성 및 자기특성의 변화

최영근(Y. K. Choi),박창만(C. M. Park),백주열(J. Y. Beak),이기암(K. A. Lee),황도근(D. G. Hwang) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3

We have studied the variations of composition and magnetic properties with deposition rate in GdFe thin films by means of DC magnetron sputtering with the enhanced complex target method. Gd atomic percent was decreased with the increase of deposite rate. It appeared the transition phenomena at 1.0 Å/s the deposition rate. Also, the deposition rate increased with input power and the sputtering efficience was proportional to the number of Gd chip. An increase of the coercivity with input power can be interpreted by the large size of Fe crystal grains. We have introduced by the diffusion guard sputtering and it was effective for reproducibility of the sample. We have measured θk with Kerr angle gauge, and could observe that the θk was little varied with input power.

체육 대학생과 일반 대학생의 체력에 관한 비교연구

최영근(Y.K.Choi),박철빈(C.B.Park) 한국체육학회 1973 한국체육학회지 Vol.8 No.-

IntroductionThe purpose of this study was to gain physical education data through the measurement of the physical fitness test which was offered to the two groups of physical education major students (male 188, female 92) and Non-Physical Education major students (male 602, female 306).Classification of the MeasurementFor the convenience of the measurement, the researcher of this study classify the measurement into the following catagories :A. Physical Constitution1. Body Height2. Body Weight3. Chest GirthB. Physical Fitness1. 100 meter run2. 1500 meter run (for male)1,000 meter run (for female)3. Chinning4. Throwing5. Sit-ups6. Standing Trunk Flextion7. Shuttle run8. Standing broad jump9. Running broad jumpSummaryThe results of this study pointed out the following facts :1. Physical education major male students (A group) recorded on an average the height of 170.7 centimeter which was 1.9 centimeter taller than the average height of non-physical education major male students (B group). And the average height of physical education major female student (C group) recorded 159.7㎝ which was 2.2㎝ taller than that of non-physical education major female students (D group).2. An average body weight of A group weighed 66㎏ which was 5.9㎏ bigger than that of B group. And the average weight of C group was 50.8kg and that of D group was 49.3kg.3. An average length of the chest girth of A group recorded 94.6cm and that of B group recorded 87. lcm. In the female groups C group recorded on an average 81.9cm which was 4cm bigger than D group.4. In the measurement of 100 meter run, A group recorded The average speed of 13.5 sec. which was 1. 0 sec. faster than the average record of 14. 5 sec. in the B group. An average record of C group was 17.9 sec. and D group recorded on the average 19.9 sec.5. An average record of 1500meter run of the A group showed 335.4 sec. and that of the B group in 1, 000 meter run was 246. 3 sec. The average record of 1, 000 meter run in C group was 250.1 sec. and that of the D group in 800 meter run showed 272. 3 sec.6. In the chinning test of male students, the average numbers of the A group recorded 12.5 times which was 4. 8 times more than the average 7. 7 times of the B group. The C group recorded 7. 5 seconds which was 1.1 seconds longer than 6.4 seconds in D group.7. In throwing test, an average distance of A group recorded 42.1 meters and the average distance of B group was 33.5 meters. The C group showed the average distance of 19.1 meters and the D group recorded 16.9 meters.8. In the measurement of sit-up test, the number of the A group was 25.4times and that of the B group was 19.2 times. The C group recorded 16.9 times and the D group recorded 8 times.9. In the result of standing trunk flextion test, the A group recorded on the average 18.4cm and an average length of the B group recorded 13. 3cm. The C group recorded on an average 19.8cm and the average record of the D group was 13. 7cm.10. An average shuttle-run test record of the A group showed 10. 9 sec. which was 0. 7 sec. faster than that of the B group. And the record of the C group was 12. 7 sec. which was 1.1 sec. faster than the D group.11. In standing broad jump test, an average distance of the A group recorded 249. 1cm and that of the C group was 187.3cm. In running broad jump test, the average distance of the B group recorded 387 cm and that of the C group was 258 cm.

분산 센서 네트워크에서 모바일 에이전트를 이용한 효율적인 데이터 수집

최신일(Shinil Choi),문석재(S.J. Moon),엄영현(Y.H. Eom),국윤규(Y.K. Kook),정계동(G.D. Jung),최영근(Y.G. Choi) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2B

분산 센서 네트워크에 대한 연구는 정보 융합 방법론상에서 활발히 진행되고 있다. 기존의 센서 네트워크에서 정보의 융합을 위한 데이터의 수집은 센서 노드가 싱크 노드로 수집된 데이터를 전송함으로써 이루어지며 싱크 노드로 수집된 데이터는 어플리케이션에 의해 활용된다. 이때 여러 센서 노드가 어플리케이션에 필요한 데이터를 중복적으로 수집할 경우 중복된 데이터를 싱크노드로 전송하는데 있어 불필요한 에너지를 소모하게 된다. 이는 결국 전체적인 센서 네트워크의 수명을 감소시키는 원인이 된다. 이러한 문제는 어플리케이션에 따라 요구하는 데이터만을 선택적으로 수집함으로써 해결할 수 있다. 이러한 과정을 수행하기 위해 각 센서 노드가 어플리케이션의 요구사항에 맞도록 데이터 중복성에 대한 처리과정을 수반해야한다. 그러나 일반적으로 센서 노드는 자원이 한정이 되어있기 때문에 다양한 어플리케이션의 요구에 따른 중복성 처리 프로세스를 모두 가지고 있을 수는 없다. 따라서 모바일 에이전트를 활용하여 데이터의 중복성 문제를 해결할 수 있다. 또한 센서 네트워크에서 고려되는 에너지 효율, 네트워크 대역폭 문제를 해결할 수 있으며 시스템 확장성이 용이하다.

배구경기(排球競技) 내용(內容)에 관(關)한 비교(比較) 연구(硏究)(Ⅰ)

李成根(S.K.Lee),崔永根(Y.K.Choi) 한국체육학회 1974 한국체육학회지 Vol.9 No.-

1. The teams particpated for the 2nd Nationwide Professional Valley Ball in 19732. The Japanese team that was invited to Korea on October 27, 1973 and Korean National teampertaining to their Serve, Spike and Receive. in including the above mentioned varios teams.1) The successfull ratio of male teams of serve were :Male Pro. team. 1.64%Korean National Team-1.15%Japanese National Team-1.15%Female Pro. Team-1.60%*The ratio of failures were :Male Pro. Team-3.10%Korean National Team-1.01%Japanese National Team-5.74%Female Pro. Team-3.20%2) The successfull ratio of receiving of the serve, were :Male Pro.-98.50%Korean National Team-98.78%Japanese National Team-97.96%Female Pro. Team-97.80%3) The successful ratio of A QuickMale Pro. Team-50.47%Korean National Team-40.00%Japanese National Team-27.27%Female Pro. Team-55.69%*The Ratio of failures :Male Pro.-18.5%Japanese National Team-9.09%Female Pro. Team-13.91%Korean National Team-was exception, non-failure.4) The successful ratio of B Quick.Male Pro. Team-56.27%Korean National Team-75.00%Japanese National Team-47.03%Female Pro. Team-47.30%*The Ratio of failures were :Male Pro.-19.45%Korean National Team-8.33%Japanese National Team-25.00%Female Pro. Team-10.14%5) The successful Ratio of Time-interval spikes were :Male Pro. Team-47.28%Korean National Team-45.45%Japanese National Team-50.00%Female Pro. Team-41.25%*The Ratio of failures wereMale Pro. Team-18.30%Korean National Team-18.19%Japanese National Team-30.00%Female Pro. Team-13.28%6) The Ratio of Open Spikes wereMale Pro. Team-42.15%Korean National Team-34.21%Japanese National Team-37.96%Female Pro. Team-28.59%*The Ratio of failures was;Male Pro. Team-21.84%Korean National Team-23.68%Japanese National Team-27.77%Female Pro. Team-11.08%7) The second step Spikes were;Male Pro. Team-81.88% successful and failure 28.84%Korean National Team-62.5% successfulFamale Pro. Team-33.33 successful and 22.03% failureJapanese rational Team-had not attach at all8) The Ratio of success in receiving from the spikes of open and time-interval during the A Quick and B Quick were;Male Pro. Team-60.34%Korean National Team-100%Japanese National Team-55.55%Female Pro. Team-80.76%9) The Ratio of successful receiveing in the second step spikes were ;Male Pro. Team-60.34%Korean National Team-100%Japanese National Team-55.55%Female Pro. Team-80.76%10) The Ratio of successful receive from the Direct Spikes were ;Male Pro. Team-16.66%Korean National Team-66.67%Female Pro. Team-81.81%11) The Ratio of Successful Receive from the Faint Spikes were;Male Pro. Team-58.61%Korean National Team-83.33%Japanese National Team-50.00%Female Pro. Team-71.70%12) The Ratio of Success of Indivudual Breakings were;Male Pro. Team-15.38%Korean National Team-20%Female Pro. Team-11.27%13) Net Touch were;Male Pro. Team 23.33% in the Spike and 76.67% in the Receive.Female Pro. Team-43.55% in the spike and 56.34% in Receive.

CFRP 복합재의 적층방향에 대한 마찰 및 마모 특성

고성위(S. W. Koh),최영근(Y. K. Choi) 한국동력기계공학회 2005 동력시스템공학회지 Vol.9 No.2

남부지방 중간간부 순무 파종적기 구명시험

장익(Jamg I.K),김치선(Kim C.S),김주(Kim J),최동칠(Choi D.C),최정식(Choi J.S),최영근(Choi Y.G) 한국생물환경조절학회 2002 한국생물환경조절학회 학술발표논문집 Vol.- No.-

CFRP 복합재의 적층방향에 대한 마찰 및 마모 특성

고성위(S. W. Koh),최영근(Y. K. Choi) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-

This paper is the study on dry sliding wear behavior of carbon fiber reinforced epoxy matrix composite against lay-up orientation. Pin-on-disk dry sliding wear tests for each experimental condition were carried out with a carbon fiber reinforced plastic pin on stainless steel disk in order to search the friction and wear characteristics. The wear rates and friction coefficients against the stainless steel counterpart processed were experimentally determined and the resulting wear mechanisms were microscopically observed. When sliding took place against smooth and hard counterpart, the highest wear resistance and the lowest friction coefficient were observed in the [0/45/90]s lay-up orientation. The fiber destruction and cracking caused fiber bending on the contact surface, which was discovered to be dominant wear mechanism.

프리지아 구근의 크기별 고온처리 기간이 휴면타파에 미치는 영향

이진재(J. J. Lee),권영립(Y. R. Kwon),최규환(K. H. Choi),최영근(Y. G. Choi),정종성(J. S. Jeong) 한국원예학회 1999 원예과학기술지 Vol.17 No.2

온도변화에 따른 GF/PP 복합재료의 충격파괴기구

고성위(S. W. Koh),엄윤성(Y. S. Um),최영근(Y. K. Choi),김형진(H. J. Kim),김재동(J. D. Kim) 한국동력기계공학회 2003 한국동력기계공학회 학술대회 논문집 Vol.- No.-

XMDR을 이용한 데이터 그리드 미들웨어 설계

노선택(Seon-Taek Noh),문석재(S.J. Moon),엄영현(Y.H. Eum),국윤규(Y.G. Kook),정계동(K.D. Jung),최영근(Y.K. Choi) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1

데이터 그리드는 분산 데이터베이스 환경에서 상호간 데이터의 공유 및 교환을 통하여 분산 데이터를 효율적으로 사용하기 위한 기술이다. 최근에는 레거시 시스템간의 협업을 하기 위해 상호 연결의 필요성이 강조되고 있으며 많은 연구가 진행되고 있다. 독립적인 레거시 시스템을 상호 연결하기 위해서는 노드간의 회선 점유율이 증가하고, 데이터의 이질적인 문제가 발생한다. 이러한 문제점을 해결하기 위해 본 논문에서는 XMDR 기반의 데이터 그리드 시스템을 제안한다. 본 논문의 데이터 그리드 미들웨어는 ISO/IEC11179에서 제안한 정보 공유 및 교환을 위한 표준인 MDR과 정보의 효율적인 이용을 위한 온톨로지를 포함하여 확장한 개념인 XMDR(eXtended Metadata Registry)에 기반을 두었으며 분산 플랫폼으로부터 독립적이고 자유로운 이동성을 가지고 있는 이동 에이전트 기술을 사용하였다.