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직경 1˝ 자성관에서의 원격장와전류 탐상 실험 빛 결함신호 특성
신영길,이창준,이정호,이윤태,장권규,송성철,송성진,정태언 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
In this study, a remote field eddy current testing system is built to inspect 1˝ diameter ferromagnetic tubes and resulting experimental signals are investigated. To decide the operating frequency, the emf of sensor coil is monitored while the sensor coil is moved away from the exciter. At proper frequency, sudden change would occur in the signal pattern. This also indicates the location of remote field region, so that the distance between coils can be decided. The defect signal contains two defect indications, each appears as the sensor and exciter coil passes a defect. Experimental results show that defect depth can be estimated by comparing the two indications. Also, linear relationship between defect depth and phase signal strength is observed.
HalogenIamp 광조사기와 Plasma xenon arc lamp 광조사기에 의한 광중합 복합레진의 중합률 비교
이영준,정병초,최남기,양규호 大韓小兒齒科學會 2002 大韓小兒齒科學會誌 Vol.29 No.3
본 연구의 목적은 일반 halogen lamp 광조사기와 비교하여 plasma xenon arc lamp 광조사기의 광중합 능력을 평가하기 위한 것이다. 7mm의 내경과 1mm, 2mm, 3mm 두께를 갖는 레진 시편을 aluminum 주형상에서 제작하여 plasma xenon arc lamp 광조사기는 2초, 3초, 6초, halogen lamp 광조사기는 20초, 40초, 60초 동안 광조사한 후 Raman spectroscopy를 이용하여 레진 시편 표면과 후면의 중합률을 측정하였다. 표면 중합률은 광조사 시간이 증가함에 따라 halogen lamp 광조사기와 plasma xenon arc lamp 광조사기 모두에서 유의성있게 증가하였으며 전반적인 중합률은 halogen lamp 광조사기에서 더 높았으나 plasma xenon arc lamp 광조사기와 유의한 차이는 없었다. 광조사 시간이 증가함에 따라 halogen lamp 광조사기의 경우 후면 중합률은 모든 두께에서 점차 증가하였으나 1.2mm 두께에서는 유의한 차이가 없었으며 plas-ma xenon arc lamp 광조사기로 중합한 경우에는 모든 두께에서 조사시간이 증가할수록 중합률은 유의성있게 증가하였다. 이상의 결과로 plasma xenon arc lamp 광조사기의 강한 광도가 광조사 시간의 감소를 완전히 보상하지는 못하는 것으로 판단되므로 plasma xenon arc lamp 광조사기로 광중합 복합레진을 중합할 경우 2mm이내의 적층 충전이 요구되며 또한 제조회사가 제시한 조사 시간보다 추가적인 광조사가 필요할 것으로 판단된다. Recently, new light curing unit utilizing the plasma xenon arc lamp is introduced. This curing unit is operated at relatively high intensity, so shortening the curing time significantly. The aim of this experiment was to esti-mate curing capability of plasma xenon arc lamp curing unit compared to traditional halogen lamp curing unit. Degree of conversion was evaluated by Raman spectroscopy after irradiation of specimens with halogen lamp curing unit(Optilux 150, Demetron, USA) for 20s, 40s, 60s and plasma xenon arc lamp curing unit(flipo, Lokki, France) for 2s, 3s, 6s. The results showed that strong light intensity of plasma xenon arc lamp curing unit did not compensate for short exposure time completely. So, Multi-layered curing within 2mm thickness and addi-tional exposure time is recommanded when light-cured composite resin is polymerized with plasma xenon arc lamp curing unit.
민어(Miichthys miiuy)의 卵發生過程 및 仔稚魚 발육단계에 따른 형태발달
한경호,오성현,황동식,조영현,서대철 한국어류학회 2002 韓國魚類學會誌 Vol.14 No.2
본 연구는 2000년 8월 19일 전라남도 신안군 임자도 연안에서 2각망으로 어획된 민어 어미를 인위적인 방법으로 수정하여 부화 사육하면서 관찰한 卵發生 過程 및 仔稚魚 형태변화는 다음과 같다. 1. 민어의 受精卵은 구형의 분리 부성난으로 알의 크기는 0.96~1.08㎜(평균 1.01㎜, n=50)였고, 크고 작은 油球가 1~5개(0.06~0.34㎜) 존재하였다. 2. 사육수온 25.2~28.4℃에서 受精 후 17시간 10분에는 배체가 卵膜을 뚫고 머리부터 孵化하기 시작하였다. 3. 孵化 직후 仔魚의 전장은 2.36~2.63㎜(평균 2.48㎜, n=10)로 전장의 45.0~47.0%에 달하는 큰 卵黃(장경 1.11~1.20㎜, 단경 0.92~0.96㎜)을 가지고 있으며 筋節은 7~8+ 17~19=24~27개였다. 4. 孵化 후 3일째 仔魚는 전장 3.98~4.32㎜(평균 4.16㎜, n=10)로 입은 열려있었고, 이 시기에 섭이활동이 활발하게 관찰되면서 卵黃이 완전히 흡수되어 後期仔魚期로 이행되었다. 5. 孵化 후 10일째 後期仔魚는 전장이 5.88~6.74㎜(평균 6.30㎜, n=10)로 꼬리의 말단이 굽어지기 시작하는 시기로 黑色素胞가 기저후두골 뒷부분의 체측에서 점모양 및 나뭇가지모양 으로 출현하였다. 6. 孵化 후 31일째 개체의 전장은 9.62~12.76㎜(평균 11.12㎜, n=10)로 모든 지느러미가 정수에 달하였고, 체형이나 반문이 成魚와 닮아 種魚期로 이행하였다. Egg development and morphological change of larvae of the brown croaker, Miichthys miiuy, were investigated after obtaining samples by artificial insemination. The spawning season extends from the middle to the end of August in the seas off Lim-ja Island, Cheollanam-do. The fertilized eggs were transparent, spherical, separate and they floated. Egg diameter ranged 0.96~1.08㎜ with several oil globules of 0.06~0.34㎜. Hatching occurred 17 hours 10 minutes after fertilization in 25.2~28.4℃ water temperature. The newly-hatched larvae were 2.36~2.63㎜(mean:2.48㎜, n=10) in total length(TL), had a large yolk, and 7~8+17~19=24~27 myotomes. Melanophores were distributed on the eye lens. Three days after hatching the larvae had attained 3.98~4.32㎜ in TL(mean:4.16㎜, n=10), the yolk sac was completely absorbed, and they had transformed into the postlarva stage. The larva reached the juvenile stage with all fins formed and with a complete set of fin rays(D.Ⅹ-28~31;A.Ⅱ-7~8;P. 21~23;C. 19~21;V. 25~26) on the 31st day after hatching. The juveniles were 9.62~12.76㎜(mean:11.12㎜, n=10) in total length. At this point the juvenile was similar to the adult in body form and pigmentation pattern.
류지구,최혁환,차영호,김정헌,조경연 釜慶大學校 1997 釜慶大學校 論文集 Vol.2 No.2
The wide spread of multimedia sysrem deands a large viewing display device which can inform a message to many peoples in open area. This paper is about the design and simulating of a large viewing digital multi-wision control ASIC(Application Specific Integrated Circuit). In this paper. the digital multi-vision ASIC has one channel of imput cideo signal wihich is compliance with CCIR-656 specification and four channels of output video signal which are compliance with CCIR-601 specificarion. It has 2 operating mode. The one is the pass-thro;ugh mode. input vido signal goes to output video signal without any change, and the another one is the expension mode, input video signal is expended by from 2 to 16 times into output video signal. In expension mode. awindow could be programmed and only the input video signal in the window is expended. The 0.6 micron CMOS sEA OF Gate is used to design the ASIC in amount of about 23,000 gates, and it is simulated at 48MHz.
박종태,최영곤,한남익,박철용,표내숙,조춘호 釜山大學校 附設 體育科學硏究所 1998 體育科學硏究所 論文集 Vol.14 No.-
In the early decades of this century, Charisma which originally means endowment with the gift of grace, has been introduced to social sciences by German sociologist, Max Weber. It quickly became interested in the field of sociology and politics. But, into the 1970s, charismatic leadership still had not became a subject for empirical or experimental research related to organizational theory. Recently, much attention has been paid to charismatic leadership as the prototype of leadership that people have in mind when they describe their ideal leader and is more likely to provide a role model with which subordinates want to identify. As a result, in will perform further study related to Charisma leadership which developing various kind of measurement and instrument. Finally, it should identify lost of possibility and phenomenon through the study of charisma leadership.
Chol-Ho Kim,Moon-Young Kim,Young-Do Kim,Gun-Woo Moon 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In the proposed equalizer, series-connected battery string is modularized into M modules. Each module has voltage monitoring IC and cell selection switch for Kcells. The monitoring IC not only monitors the battery voltage, but also controls the selection switch for cell balancing. With this configuration, the battery monitoring and balancing can be effectively merged by the same controller. Moreover, by using a central equalization converter, great size reduction and outstanding balancing performance can be obtained for a large number of battery cells. In this paper, to demonstrate usefulness of the proposed work, a prototype for 88 lithium-ion battery cells is optimally designed and implemented. Experimental results verify that the proposed equalization method has good cell balancing performance.