The Relation Between Local Hysteresis Losses and Remanent Magnetic Fields in HTSC Films

Muyong Kim,Heeyeon Park,Chan Kim,Sang-Kook Park,Ri, H.-C Institute of Electrical and Electronics Engineers 2017 IEEE transactions on applied superconductivity Vol.27 No.4

<P>Various critical state models have been developed to understand the hysteresis loss mechanism of high-temperature superconducting (HTSC) films. The analytic relation between the hysteresis loss and the remanent field was obtained based on Bean's critical state model for thin films in the full-penetration case. Furthermore, numerical calculation of local hysteresis loops was carried out by Kim's critical state model. In this paper, we investigated local hysteresis losses for a GdBCO coated conductor by using low-temperature scanning Hall probe microscopy and reproduced the experimental results by applying the critical state model. Because of the demagnetizing effect in thin films, analysis of local hysteresis losses can be useful approach to understand of total hysteresis losses.</P>

Mg-Zn-Ca합금의 부식저항 개선에 관한 연구

김유영,허남수,안국찬,김인환 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6

In order to corrosion resistance of Mg-Zn alloy the 3rd element, Ca(0 to 1.5wt.%)element was added. Alloy ingot was made under vacuum atmosphere of 4×10^-4 Torr in the quartz tube coated by BN. The addition of Ca elements to Mg-Zn alloys were obtained grain size refining and age hardening. Corrosion characteristics were investigated by potentiostatic corrosion test in 5wt.%NaCl solution.(ΔE=100mV) The corrosion current density of Mg and Mg-6wt.% Zn alloy was reduced by addition of 0.5wt.% Ca.

Myelodysplastic Syndrome의 혈액학적 소견

박찬정,조한익,김상인,이재훈,김병국,김노경 大韓血液學會 1984 大韓血液學會誌 Vol.19 No.2

화성암 중의 Selenium 정량

김찬국,山谷和久,吉田稔 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.1

A study was performed for determination of trace of selenium in igneous rocks, by means of hydride generation methods with preconcentration. The procedure follows : At first, transfer 10㎖ of sample solution and 10㎖ of hydrochloric acid to a reaction vessel and inject 3% sodium tetrahydroborate solution with a flow rate of 4㎖/min for 45 seconds. Hydrogen selenide is generated from the sample solution by passing nitrogen gas at a flow rate of 125-150㎖/min for 3 minutes. Then the nitrogen gas bearing the hydrogen selenide is introduced in an absorbing solution(3M HC10₄ 5㎖十0.02M KMnO₄ 0.20㎖+0.05M Na₂C₂O₄0.15㎖) through a sintered glass filter At the second step, concentrated hydrochloric acid of 5㎖ with 1M potassium bromide solution of 0.20㎖ are added to the sample solution and then the solution was heated up to 95℃ for 45minutes for reduction of Se(Ⅵ) to Se(Ⅳ). The selenium contents of the concentrated sample solution were determined by A. A. S. The proposed method was applied to the determination of Se in igneous rock samples and satisfactory results were obtained.

고요산혈증의 위험인자 : 아산시 지역 주민을 대상으로

김용배,장원기,황보영,김화성,안규동,이병국,이용진,이종은,이준숙,이찬구,이한정,이성수 순천향대학교 2006 Journal of Soonchunhyang Medical Science Vol.12 No.1

Objective : Serum uric acid has now been identified as a marker for a number of metabolic and hemodynamic abnormalities. The aim of this study is to evaluate risk factors which influence hyperuricemia in the citizens of Asan. Method : The study design was cross-sectional and research subjects were 1086 citizens of Asan. General characteristics, cigarette smoking, alcohol consumption, and past history were obtained by interview using a structural questionnaire. Also, we measured height, weight and blood pressure, and serum uric acid of the subjects. Results : The mean serum uric acid level was 5.27 ㎎/㎗ in men and 4.01 ㎎/㎗, in women, In the multiple logistic regression analysis, statically significant risk factors of hyperuhcemia were gender, body mass index, blood lead concentration, and serum creatinine. Conclusion : Our results suggest that gender, body mass index, blood lead concentration, and serum creatinine might be the most important risk factors of hyperurcemia. Education program as well as routine check-up for serum uric acid was highly recommended for the effective prevention of hyperuricemia.

극미량 Se의 정량에 관한 연구

김찬국 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2

A study was performed for determination of the trace amount of Selenium by A.A.S. with hydride generation method. The procedure is as follows ; transfer 40㎖ of sample solution and 20㎖ of HCl to a reaction vessel and inject 3% NaBH₄solution with a flow rate of 3㎖/min for 45 seconds. H₂Se gas is generated from the sample solution by passing nitrogen gas is introduced into an absorbing solution through a sintered glass filter. Then transfer it into 100㎖ beaker and add 3㎖ of HNO₃solution. Heat on a hot plate at 150℃ to evaporate slowly to about 2∼3㎖. Then add 10㎖ of 6M-HCl to the solution and heat to about 125℃ for reduction of Se(Ⅵ) to Se(Ⅳ). The selenium contents of the concentrated samples were determined by A.A.S. with hydride generation. This method is excellent for the determination of Selenium in view of conveniency, rapidity, high sensitivity and good reproducibility.

설록차에 의한 Cadmium, Lead 및 Copper 이온의 흡착 특성

김찬국,강헌찬 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.1

The adsorption characteristics of heavy metal ion(Cu^(2+), Cd^(2+), Pb^(2+)) on the Korean sullok tea has been studied. The tea powder was treated with formalin in a dilute sulfuric acid. A l00ml solution containing heavy metal ions was mixed with 0.5g of the tea under shaking by jar tester for 60 minutes. The solution was the filtered through and the concentration of metal ions in the filtered were determined with atomic adsorption spectrometer. These results suggest that the metal ions have unexpectedly strong affinity for the powderly sullok tea. Heavy metals on sullok tea were easily eluted by using 0.1-M hydrochloric acid solution. The tea can be reused over several times on the adsorbent, after the metal are washed away with hydrochloric acid.

韓國 氣象資料의 分析을 通한 運氣 氣候에 關한 硏究

朴燦永,金基郁,朴炫局 동국대학교 한의학연구소 2000 東國韓醫學硏究所論文集 Vol.8 No.2

명대 장경악은 기상 현상에 관하여 “오운육기를 토대로 기화를 추측하면 피차의 영허에 대해 십중칠팔은 들어맞는다”고 하였는데, 이를 착안하여 논자는 『황제내경』에 기재된 기상에 관하여 운기의 기후 특징을 한반도 서울을 중심으로 실제 기상관측 자료와 비교 분석하였다. 기상청 자료를 토대로 서울의 평균 풍속·평균 기온·강수량·평균 습도를 운기 이론 가운데 대운과 비교하였다. 또한 과거 1564년에서 1863년까지 한반도의 이상 기후 발생 빈도와 운기성쇠·운기동화·운기순역과 비교하였을 때, 운기동화의 경우와 이상 기후 발생 빈도와 일치하였다. 다만 본 논문의 실제관측 자료와 통계는 한국의 서울을 중심한 분석이기에, 중국과의 어느 정도 오차를 고려하여야 할 것이다. The comparison of climate s character of Yunqi(運氣) with the data of meterological observation were made in the research of climate. 1. The comparison of the average velocity of wind, temperature, rainfall, humidity of Seoul, by late 1954 to 1983, with Yunqi(運氣) was made. Fire-Chi(火氣) and moistme-qi(??氣) were matched with the attribute of Taiyun(大運). Cold-qi(寒氣) was had some relationshlp. Dry-qi(??氣) and Wind-qi(風氣) were not matched. About the relationship of Spirit-of-official-sky(可天之氣) with climate, when the Moisture-soil(??土) was added, they were matched and when the King-fire(君火) was added, they have some relationship. But Wind-tree(風木), Dry-metal(??金), Buble-fire(相火), Cold-water(寒水) was added they were not matched. 2. According to the observation data of rainfall by late 180 years of Seoul; about Taiyun(大運), when the Water-Yun(水運) was greatly exceeded and Fire-Yun(火運) was shorted, in the case of Official-sky(司天), when Wind-Tree(風木) was added, the frequency was highly. So when the Soil-Yun(土運) was greatly exceeded and when Official-sky(司天)was added to the Moisture-soil(??土), the rainfall was not matched. 3. The relationship of the frequency of the abnormal climate occurrences between Yunqi-promotion-weak(運氣盛??)and Yunqi-Hannony(運氣同化) and Yunqi-soft-attaclung(運氣順逆) in the weather of Korean Peninsula was compared by 1564 to 1863. They were not matched except the case of Yunqi-Harmony(運氣同化). 4. There were some cases which were not matched exactly between the climate predicted by the theory and real climate in 1984, the year of Kap-ga(甲子年). But many correspondence between the observation by the office of meteorology and the prediction by the analysis from Yun-qi-sang-hab(運氣相合) theory. 5. Because meterological phenomena of real world and analysis from the hypothesis of Yunqi(運氣) have no relationship with each other, some of Doctor denied Yunqi(運氣) in the way of matching mechanically. But the thought of Doctor who denied Fortune-spirit(運氣) made promotion for the theory of divination by bringing deeper insight. And it was not only the negative side. 6. In the point of geographical difference, the climate of China, the origination Yunqi theory, is different from the Korea's. Thus some observation errors should be considered. From the basis of this thesis, I hope that the deeper advance would be made into the Korean Yunqi theory.

한약제 복용으로 인한 연중독 1례

박찬국,김용균,박상호,정춘해,조건국 조선의대 1985 The Medical Journal of Chosun University Vol.10 No.1

횡방향 충격을 받는 적층복합판의 층간전단응력 해석

안국찬,박승범,김봉환 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4

This paper demonstrates the analyses of the interlaminar shear stress of laminated composite plates subjected to transversely impact. For this purpose, a plate finite element model based on the higher order shear deformation plate theory in conjunction with static contact laws is developed. Test materials were CFRP with cross-ply laminate [0_4/Θ_4]_s, [90_4/Θ_4]_s stacking sequences and angle-ply laminate [Θ_4/-Θ_4]_s, [Θ_4/-Θ_4]_s stacking sequences with 2^t×40^w×100^l(㎜) dimension. As a result, stacking sequence and fiber orientation were found to have a significant effect on the interlaminar stress in composite laminates.