• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.140-142
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• 1998

The major part of SMES (Superconducting Magnetic Energy Storage) system consist of the superconducting coil, cryostat and current lead, power converter. The 0.7MJ SMES coil was a design and manufacture by using SMES device that we developed a design code. A SMES coil was wound with high winding tension in order to prevent wire motion from Lorentz force. This paper described optimum design for the SMES coil.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1343-1346
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• 2005

In the cold rolling mill, coil breakage that generated in rolling process makes the various types of troubles such as the degradation of productivity and the damage of equipment. Recent researches were done by the mechanical analysis such as the analysis of roll chattering or strip inclining and the prevention of breakage that detects the crack of coil. But they could cover some kind of breakages. The prediction of Coil breakage was very complicated and occurred rarely. We propose to build effective prediction modes for coil breakage in rolling process, based on data mining model. We proposed three prediction models for coil breakage: (1) decision tree based model, (2) regression based model and (3) neural network based model. To reduce model parameters, we selected important variables related to the occurrence of coil breakage from the attributes of coil setup by using the methods such as decision tree, variable selection and the choice of domain experts. We developed these prediction models and chose the best model among them using SEMMA process that proposed in SAS E-miner environment. We estimated model accuracy by scoring the prediction model with the posterior probability. We also have developed a software tool to analyze the data and generate the proposed prediction models either automatically and in a user-driven manner. It also has an effective visualization feature that is based on PCA (Principle Component Analysis).

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집A
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• pp.975-980
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• 2001

Like composite material. the coil winding pack of the KSTAR (Korea Superconducting Tokamak Advanced Research) consist of multiphase element such as metallic jacket material for protecting superconducting cable, vacuum pressurized imprepregnated (VPI) insulation, and corner roving filler. For jacket material, four CS (Central Solenoid) Coils, $5^{th}$ PF (Poloidal Field) Coil, and TF (Toroidal Field Coil) use Incoloy 908 and $6-7^{th}$ PF coil, Cold worked 316LN. In order to analyze the global behavior of large coil support structure with coil winding pack, it is required to replace the winding pack to monolithic matter with the equivalent mechanical properties, i.e. Young's moduli, shear moduli due to constraint of total nodes number and element numbers. In this study, Equivalent Young's moduli, shear moduli, Poisson's ratio, and thermal expansion coefficient were calculated for all coil winding pack using Finite Element Method.

• 한국식품영양과학회지
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• 제27권6호
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• pp.1173-1176
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• 1998

Glycogen synthetase[EC 2.4.1.21] in E. coli B was isolated and purified by sonication, ultracentri fugation, DEAE cellulose chromatography and gel chromatography. In the case of using glycogen or maltotriose as a primer in the enzyme reaction, 64% and 23.7% of labelled ADP glucose were incorporated into primer, respectively. 8.1% of labelled ADP glucose was polymerized into glycogen in enzymatic reaction without a primer.

• 한국초전도ㆍ저온공학회논문지
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• 제3권2호
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• pp.5-9
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• 2001

For the development of a small-sized superconducting magnetic energy storage($\mu$SMES) system we designed, fabricated and tested a model coil consisting of five coils with different features. e.g. winding tensions. bore diameters and materials. cooling channels. The results show that even in the highly pre-stressed small coil the quench currents of the coils are degraded to about 70% of their coils critical current. The quench currents of the coils with natrow cooling channels are two times as high as that of the coil without spacers. The test results also indicate that the usual training effect depends on the winding tensions of the coils according to materials of the bobbin.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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• pp.66-72
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• 2000

Commercial eddy current dynamometers control the torque of ratating body (poer supply machine) with the field coil current being operated as a braking force. In this paper, we studied about the relation between the field coil current and the torque load of eddy current dynamometer. By the torque measuring analysis of eddy current dynamometer, it is linear relation between the brake force measured from the torque meter (e.g. load cell, strain gage or spring balance etc.) which is installed at the case of dynamometer and the multiply of shaft rpm by the square of field coil current (N$\times$Ia2). To prove the relation, it was experimented and showed that the torque operated by the rotating body can be measured with the shaft rpm and the field coil current of eddy current dynamometer. This result shows a possibility that eddy current dynamometer can measures the torque of rotating body without special torque measuring devices.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.15-17
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• 1999

A voice-coil-type LOA consists of the NdFeB permanent magnets with high specific energy as the stator, a coil-wrapped nonmagnetic hollow rectangular structure. We have to obtain the back-EMF constant ${\kappa}_E$ from 3D FEA and experiments, precisely. The ${\kappa}_E$ and other parameters provide the transfer function, through which is derived the frequency response characteristics. Inverter-fed LOA is examined aiming to compare with results of simulation.

• 한국정보전자통신기술학회논문지
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• 제12권6호
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• pp.657-665
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• 2019

본 연구는 전 세계적으로 문제가 대두되고 있는 고령화 사회로 인한 신경성 퇴행 질환인 치매 및 근육통증 치료방법인 경두개 자기 전극에 관한 연구를 진행하였다. 특히 경두개 자기 전극은 두부 표피에 코일을 이용하여 뇌 심층으로 자기를 출력하여 언어능력, 인지능력, 기억력 등의 치매 증상에 의해 저하되는 능력을 향상시키기 위해 연구가 진행되고 있다. 본 연구에서는 경두개 자기 전극의 핵심인 코일의 설계를 위하여 Maxwell 3D 프로그램을 통한 시뮬레이션을 진행하였다. 선행 연구로 설계된 코일과 연구 개발을 통한 코일의 시뮬레이션 비교를 한 결과 출력의 경우 기존의 설계된 코일 보다 출력 면에서 뛰어난 것을 확인할 수 있었다. B-Field, H-Field 두 개의 코일 출력의 그래프는 대칭을 이루는 것을 확인하였으나, 각 코일간의 대칭은 유사 대칭으로 정확한 대칭을 이루지 않는 것으로 확인이 되었다. 이러한 결과를 바탕으로 양 코일을 통한 두부 표피의 출력이 가능한지에 관한 확인을 위해 실험을 진행하였다. 역순방향 2-코일의 분석의 자기장의 경우 최대 출력은 3.3920e+004 H[A_per_meter]로 나타났으며 벡터장의 경우 35도에서 165도 부근에서의 자기장이 가장강한 것으로 나타났지만, 양 방향의 자기 출력으로 인하여 자기 출력이 상쇄가 되는 것을 확인하였다. 순방향 2-코일의 경우 역방향 코일과 비슷한 최대 3.2348e+004H[A_per_meter] 나타났으나 vector field의 경우 순방향 출력 및 두부 표피 출력에 관한 자기 출력이 확인이 되었다. 다만, 출력 코일에서 높이의 변화를 하였을 때, 자기 출력이 줄어드는 것을 확인할 수 있었다.

• 대한수의학회지
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• 제26권1호
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• pp.69-77
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• 1986

The purpose of this study was the examination for presence of K99 antigen (K99), enterotoxigenicity, 0-groups, colicin and antibiotic susceptibility among E. coil isolated from calves and cows. A total of 49(18.7%) among 262 strains, isolated from 30(26.5%) out of 113 calves and cows, possesed K99, and thirty three of 49 $K99^+$ strains produced ST. Of the strains of diarrheal calf origin which less than 15 days old, a high correlation was observed between enterotoxigenic ability and K99: 92.3% of the $K99^+$ strains produced heat stable enterotoxin(ST). In O group typing of 33 $ST^+$ strains, they belonged to O20(48.4%), O8(9.1%), O9(6.1%), O139(6.1%), O149(6.1%), O101(3.0%), O115(3.0%), except six which were untypable or autoagglutinable. Of 262 E. coil isolates, 30 strains(13.3%) produced colicin and K99 were detected in 6 strains. One hundred eighty eight strains(71.8%) of 262 E. coil isolates were resistance to ampicillin, chloramphenicol, gentamicin, kanamycin, streptomycin, tetracycline, alone or in combination thereof. One hundred and fourteen(60.6%) out of 188 drug resistance strains carried R factor($R^+$) which were transferable to the recipients by conjugation. Sixty five $R^+$ strains(57.0%) carried thermo-sensitive R plasmid.

• 대한치과의사협회지
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• 제43권12호통권439호
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• pp.799-808
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• 2005

이 연구의 목적은 치수 및 치근단 조직의 감염의 주요 원인들이 Porphyromonas endodontalis의 LPS가 치주인대 섬유아세포의 MCP-1 MIP-1α 그리고 RANTES의 생성에 미치는 영향을 관찰함으로써 치근단 염중의 발병에서 섬유아세포의 역할을 알아보는 것이다. 혐기성 조건에서 배양한 P. endodontalis와 E. coil의 LPS를 추출, 정제한 후, 치주인대 섬유아세포 0.01, 0.1, 1, 10ug/ml 농도의 P. endodontalis와 E. coil의 LPS로 12, 24, 48시간 동안 자극하였다. MCP-1, MIP-1α 그리고 RANTES의 단백질 농도는 ELISA를 이용하여 분석하였다. 이연구의 결과는 아래와 같다. 1. P. endodontalis의 LPS로 자극시킨 치주인대 섬유아세포에서 분비된 MCP-1의 수준은 시간과 농도에 비례하여 증가하였다. 2.E.coil의 LPS로 자극시킨 치주인대 섬유아세포에서 분비된 MCP-1의 양도 시간에 비례하여 증가함을 보였다. 이는 P. endodontalis LPS보다 통계적으로 유의성있게 많은 양을 나타냈다.(p<0.05) 3. 치주인대 섬유아세포에서 MIP-1α 과 RANTES는 거의 분비되지 않았다. 이 연구에서 세균의 LPS로 자극시 치주인대 섬유아세포 MCP-1의 강한 발현은 만성 치근단 염증의 초기에 단핵세포와 대식세포의 recruitment를 증가시키는 것고 관련되어지는 것으로 보인다.