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The Optimal Design of 600 kJ SMES Magnet Based on Stress and Magnetic Field Analysis
Sangyeop Kwak,Myungjin Park,Wooseok Kim,Seungyong Hahn,Seungwook Lee,Jikwang Lee,Kyeongdal Choi,Jinho Han,Joonhan Bae,Seokho Kim,Kiduk Sim,Haejong Kim,Kichul Seong,Hyunkyo Jung,Songyop Hahn IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>In the development of large scale superconducting magnetic energy storage (SMES) systems, the problem of mechanical stresses induced in the windings by Lorentz force becomes more critical as dimensions of system and magnetic field increase. In this paper, an optimal design process of a 600 kJ SMES magnet combined with mechanical stress analysis is presented. A stress analysis method based on electromagnetic finite element analysis (FEA) is explained in detail. The results of the analysis led to the development of an optimum design, electro-magnetically and mechanically, of a single-pole double pancake coil (DPC) type 600 kJ SMES magnet. The stress in each DPC are described along with recommendations for winding tension in the manufacturing process to minimize radial and hoop stress in each DPC.</P>
Conceptual Design of HTS Magnet for a 5 MJ Class SMES
Myungjin Park,Sangyeop Kwak,Wooseok Kim,Jikwang Lee,Jinho Han,Kyeongdal Choi,Hyunkyo Jung,Joonhan Bae,Seokho Kim,Kiduk Sim,Haejong Kim,Kichul Seong,Songyop Hanh IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>Superconducting magnetic energy storage (SMES) systems with High Temperature Superconducting (HTS) wires have been actively developed world-wide. A 600 kJ class SMES with Bi-2223 HTS wire has been in development as a national project since 2004 and is currently approaching the final testing stage of the first of three phases. In the second phase of the project, several MJ class HTS SMES will be developed. In this paper, designs of magnets for 5 MJ class SMES with DI-BSSCO and YBCO coated conductor are presented and compared.</P>
윤선진 ( Seonjin Yoon ),정명상 ( Myeongsang Jeong ),송해종 ( Haejong Song ),나은경 ( Eunkyung Na ),김나영 ( Nayoung Kim ),김경아 ( Kyongah Kim ),권순복 ( Soonbok Kwon ),이인숙 ( Insook Lee ),김재식 ( Jaesik Kim ) 한국환경분석학회 2020 환경분석과 독성보건 Vol.23 No.4
ThepurposeofthisstudywastodocumentgroundwaterqualityinChungcheongnam-do.SamplesweretakenfromTaean,Dangjin,Seocheon,Boryeong,Seosan,andNonsanareas,and48waterqualityvariableswereanalyzedinrelationtoapplicablestandards,includingtheamountsofnaturallyoccurringradioactivematerials(UandRn).Theresultsfromtesting179locationsindicatedthat128weresuitableand51wereofunacceptablequality,intermsofdrinkingwaterqualitystandards.Thenonconformityratefornitratenitrogenwas47.0%,whilethatfortotalcoliformswas24.2%.Heavymetals-suchasPb,Hg,Cd,andCr-weredetectedinlowconcentrationsatallpoints.AnalysisofnaturallyoccurringradioactivematerialsshowedthatUconcentrationswerewithinthewaterqualitystandard(0.03mg/L)atallpoints.RnconcentrationswerelowinNW?ㅤregionssuchasTaean,Dangjin,Seocheon,andBoryeong,whereProterozoicsedimentaryrocksweredistributed,butitsconcentrationsintheSeosanandNonsanareas,wheregraniterockswerewidelydistributed,requiredcloserinvestigation,anditwasfoundthatthealternativemaximumcontaminantlevel(148Bq/L)wasexceededingranitesoilswhichoriginatedfromtheMesozoicEra.
제해종(Haejong Je),김희준(Hee-Joon Kim) 한국콘텐츠학회 2020 한국콘텐츠학회논문지 Vol.20 No.3
본 연구는 율법과 은혜의 관계를 중심으로 언약 신학을 재고찰한다. 이를 위해 우선 시내 언약이 은혜 언약인지, 행위 언약인지를 살펴보는데, 이 문제는 오랜 기간동안 지속된 논의에도 불구하고 명확한 결론에 이르지 못했다. 기존 연구들은 다양한 스펙트럼을 이루는데 큰 흐름의 줄기들은 최소한 네 가지로 분류될 수 있다. 첫째는 시내 언약이 은혜 언약과 동일하다는 견해, 둘째는 그것이 행위 언약이라는 견해, 셋째는 그것이 제3의 독자적인 언약이라는 견해, 넷째는 그것이 은혜 언약과 조화를 이룬다는 견해이다. 각 견해의 대표적 학자를 중심으로 핵심 내용을 살펴본다. 또한 비록 여러 현대 신학자들이 행위 언약이라는 용어를 거부함에도 불구하고, 각 견해가 어떻게 현대 신학자들의 율법 논의와 연결되는지 살펴본다. 그 중 특별히 네 번째 견해 및 율법관이 율법과 복음의 관련성에 관해 나머지 견해들과 어떻게 다른 이해를 갖고 있는지를 관찰한다. 그리고 이 독특한 네 번째 견해가 성경 본문의 독법에 기인한 것이라는 점에 착안해서, 시내 언약과 성경의 다른 언약들의 구조적 특징들을 비교 분석한다. 그리고 이 분석을 토대로 시내 언약과 신약의 언약들을 포함한 성경의 여러 언약들에 하나님의 은혜와 인간의 의무가 공존하며, 따라서 성취의 조건성이 존재한다는 점을 입증한다. 이 조건성은 하나님 편에서의 배타성으로 인해 부여되는 것이 아니라, 인간 편에서의 연약성으로 인해 부여되는 것이다. 하지만 조건성을 갖지 않는 언약들도, 비록 소수이지만 성경에서 찾아볼 수 있기 때문에, 무조건적 언약과 조건적 언약의 차이점을 논의한다. 마지막으로 언약에서 은혜가 차지하는 올바른 위치와 역할을 살펴본다. This study reconsiders covenant theology through the relationship between law and grace. In order to do this, it first evaluates whether the Sinaitic Covenant is a covenant of grace or a covenant of works. This has been in discussion for a long period of time among theologians, yet is far from settled. Traditional studies form a wide spectrum, which can be divided into at least four major branches. First, the Sinaitic Covenant is the same as the covenant of grace. Second, the Sinaitic Covenant is the same as the covenant of works. Third, the Sinaitic Covenant forms a third, independent category of covenant. Fourth, the Sinaitic Covenant exists in harmony with the covenant of grace. Each category is summarized along with its representative proponents. Also, even though the term covenant of works is not accepted as prevalently among modern theologians, observations is made on how each category connects to and continues in modern theological discussions regarding law. Special emphasis is given to the fourth category and the fourth perspective on law with respect to how they differ from the others in viewing the relationship between law and gospel. Moreover, recognizing that the unique understanding of the fourth view grows out of a careful observation of the Biblical text, the structural similarities between the Sinaitic Covenant and other Biblical covenants are compared based on the Biblical text. Based on this comparison, it is observed that God’s grace and human duty coexist in several Bible covenants including the Sinaitic and New Testament covenants. From this observation, it is proved that conditionality regarding covenant fulfillment exists in them all. This conditionality does not entail from exclusiveness on the part of God, but from the weakness on the part of humans. However, some unconditional covenants, albeit few in number, can be found in the Bible. Therefore, the difference between unconditional covenants and conditional covenants is discussed. Lastly, the proper place and role of grace in covenants is studied.
Jang, Haejong,Mai, Xuan-Lan,Lee, Gunhee,Ahn, Jae Hyoung,Rhee, Jongsook,Truong, Quoc-Ky,Vinh, Dinh,Hong, Jongki,Kim, Kyeong Ho Korean Society for Mass Spectrometry 2018 Mass spectrometry letters Vol.9 No.4
An innovative, simple, and rapid assay method based on liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) was developed and validated for the simultaneous determination of eight statin drugs in human urine. A simple sample clean-up procedure using the "dilute and shoot" (DAS) approach enabled a fast and reliable analysis. The influence of the dilution factor was investigated to ensure detectability and reduce the matrix effect. Chromatographic separation was performed on a Phenomenex Kinetex C18 column ($50{\times}3.0mm$ i.d., $2.6{\mu}m$) using an elution gradient of mobile phase A composed of 0.1% acetic acid, and mobile phase B composed of acetonitrile, at a flow rate of 0.35 mL/min. Quantitation was performed on a triple quadrupole mass spectrometer operated in multiple reaction monitoring (MRM) mode using electrospray ionization in positive ion mode. The total chromatographic run time was 15 min. The method was validated for selectivity, sensitivity, recovery, linearity, accuracy, precision, and stability. The present method was successfully applied to the analysis of Rosuvastatin in urine samples after oral administration to healthy human subjects.
전류 벡터 제어 및 정현파 전류 입력을 고려한 Traction motor의 인덕턴스 측정 오차 저감 연구
이재민(Jaemin Lee),김해중(Haejong Kim),홍정표(Jung-pyo Hong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper presents a study on current vector control and feeding sinusoidal current for reducing errors of inductance measurement. Inductance is important parameter, which take significant effect on machine performance characteristics. In order to measure the inductance, no-load and load test are performed. However, the inductance is different to measure accurately, obvious errors always occurs between finite element analysis and experimental results. Therefore, the experimental study on the vector control strategy for improving the measurement is necessary. In this study, the measurement errors of the inductance are reduced by correcting current phase angle and inputting sinusoidal current.