• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.398-399
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• 2019

본 논문은 LS산전 고압인버터의 국내외 현장 전용화 사례에 대해 기술한다. 고압인버터는 대용량 고전압 전동기를 구비한 중요부하에 주로 적용되며 단독운전보다는 다수의 고압인버터가 연동 운전하는 현장에 설치되는 경우가 많다. 이러한 현장에는 표준제품이 아닌 전용화 기능을 포함한 제품이 출하가 된다. 자사 LS MVD는 각종 산업설비와 국책연구기관의 시험설비 그리고 발전소 수처리 시설 등 국가기간시설에 많이 적용이 되며 매년 70여대 이상의 MVD가 국내외 전동기 부하에 신규로 설치되어 운용되고 있다. 본 논문에서는 주목할만한 현장의 전용화 사례에 대해 설명하여 향후 고압인버터를 적용하고자 하는 고객이나 고압인버터에 관심이 있는 엔지니어에게 고압인버터에 대한 이해도를 높이고자 한다.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.421-422
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• 2020

Hardware In-the-Loop simulation(HIL)은 실제 하드웨어 시스템을 실시간 모사할 수 있는 시뮬레이션 장비로 연구 및 개발 기간의 단축, 비용저감 등의 장점을 앞세워 다양한 전력전자 분야에 사용되고 있다. 실제 하드웨어를 그대로 모사하는 것이 HIL의 목적이기 때문에 HIL 장비는 검증의 실시간성과 출력된 결과의 정확성이 무엇보다도 중요하다고 할 수 있다. 하지만 코어간의 데이터를 주고받는 과정에서 HIL의 연산 속도 및 정확성을 저해하는 요인들이 발생하게 된다. 본 연구에서는 HIL 장비를 이용해 복잡한 시스템을 구현함에 있어서 연산속도 및 정확성을 저해하는 요인들을 찾아내고 이를 해결하기 위한 방법을 제안한다. 제안된 연산속도 개선 및 정확성 개선 방법의 타당성은 프로세서의 연산 속도 변화량, HIL 및 시험 결과 파형의 비교 분석을 통해 검증되었다.

• Restorative Dentistry and Endodontics
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• v.9 no.1
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• pp.69-79
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• 1983

This study was undertaken to evaluate the effects of varnish application and thermocycling on the marginal leakage. 240 cavities of Class V were prepared on the 120 extracted premolars, and the cavities were filled with amalgam, Heliosit$^{(R)}$, and Hipol$^{(R)}$ after application of Copalite$^{(R)}$ or Duraphat$^{(R)}$. All specimens were immersed in methylene blue solution for 24 hours after thermocycling at $4^{\circ}C$ and $60^{\circ}C$, embedded in acrylic resin, and sectioned with low speed saw into two parts. The sectioned specimens observed with the metallurgical microscope. The following results were obtained: 1. The marginal seal was more effective in the amalgam-filled cavities after application of Copalite$^{(R)}$ threetimes or an application of Duraphat$^{(R)}$ varnish than in those without varnish applications. 2. Of the composite resin-filled cavities, the leakage of the varnish applied cases showed much more than without application. 3. There was no significant difference in the effect of marginal sealing between Copalite$^{(R)}$ and Duraphat$^{(R)}$ applications. 4. There was a significant difference in the degree of the marginal leakage of amalgam-filled cavities between the groups of thermocycling times, but no significant difference in the resin-filled cavities. 5. There was no significant difference in the degree of the marginal leakage between the Heliosit$^{(R)}$ and the Hipol$^{(R)}$ resin-filled cavities.

• Journal of Information Technology Applications and Management
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• v.12 no.4
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• pp.133-155
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• 2005

This Paper makes an attempt to suggest a process of automatically generating application software based on the Entity-Relationship model 1. The designer develops an E-R model of an real-world system. 2. The designer inputs the entity and relationship types, and attributes shown in the E-R model, and also the basic operations of the application system to the software generator. 3. The application generator produces database schema and link information between application programs, and then automatically generates a stereo-type application system. In order for the automated application generator to build the application system in a systematic way, four basic program generation rules have been suggested. A set of computer programs have been developed in order to show the applicability of the automated software generation process suggested in this paper. By following each rule with the generator, the designer can build an application in an efficient manner compared with traditional (manual programming) approaches. It has been demonstrated from the case study that the idea of applying an automated generator in systems development based upon the E-R model is feasible.

• Bulletin of the Korean Chemical Society
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• v.27 no.10
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• pp.1689-1692
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• 2006

• Journal of Korean Society for Quality Management
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• v.23 no.1
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• pp.74-94
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• 1995

Through the application of Quality Assurance(QA) techniques in R&D activities, we can approach for cost reduction and productivity improvement with high reliability. Application of QA systems in R&D in developed countries were studied, a enquete survey was performed to investigate researcher's understanding of QA in R&D. As a result of this study, it is considered desirable that QA system be applied partially to the feasible work areas at first, and the scope of application be enlarged to extended areas, later. For these aims, various and feasible QA system should be developed and established. As the need for quality assurance in R&D is expected to be increased continuously in the future, it is imperative for us to be prepared for the application of QA system in R&D activities.

• Korean Journal of Pharmacognosy
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• v.41 no.1
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• pp.26-30
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• 2010

The root of Korean ginseng (Panax ginseng C.A. Meyer) is a commonly used herbal medicine in China, Korea, Japan. However, the compositions and effects of Korean ginseng berry are not clear to date. In order to investigate the anti-aging effects in the skin, Korean ginseng berry was extracted with 70% ethanol and tested the biological effects. In the results, Korean ginseng berry extract showed an excellent anti-oxidant effect against oxidative stress and decreased MMP-1 over-expression induced by UV irradiation. Especially the main component of Korean ginseng berry extract, ginsenoside Re, increased hyaluronic acid in HaCaT keratinocytes. We improved Korean ginseng berry could be a good material for the anti-aging effect of skin.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.8
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• pp.1161-1167
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• 2015

Distribution Management System(DMS) ienhancing distribution automation system-based operation efficiency is an optimized system by various operational applications in a distribution network. DMS employs various applications like topology reconfiguration, volt/var control, and restoration at events such as overload, voltage violation, and a fault in a distribution system. An operation efficiency to employ multi-applications as restoration with short-term load forecasting is higher than a performance by a single application; and the applications are accomplished by an operator’s control. Applications’ combination is determined by various alarm information which means critical issues in order to operate a distribution system. Thus, this paper proposes an application management system which can configure application combination, control applications depending on alarm information and check their performance condition. The proposed application management system can be customized by operator easily and have high operation efficiency and reliability because it is worked by reviewed alarm information from operator.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.33 no.4
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• pp.114-121
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• 2010

Traditionally Nuclear Research and Development (R&D) result has been big influence on other industries and societies and it requires large scale investments and study period. So it is essential to apply Quality Assurance (QA) for systematic R&D management. This paper investigates QA System for U.S. Nuclear R&D and reviews QA elements. Based on this investigation, we applied QA requirements to Nuclear Hydrogen R&D project, and the scope of application be enlarged as R&D stage in progress. We also present QA system improvement way through consideration for Nuclear Hydrogen Project's QA application. As the need for QA in R&D is expected to increase in the future, it is necessary to prepare guidelines for R&D QA.

• Journal of the Korean Data and Information Science Society
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• v.3 no.1
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• pp.25-31
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• 1992

Some results relating to $C_{0}(R)\;and\;L^{1}(R)$ spaces with application to kernel density estimators will be introduced. First, random elements in $C_{0}(R)\;and\;L^{1}(R)$ are discussed. Then, complete convergence limit theorems are given to show that these results can be used in establishing uniformly consistency and $L^{1}$ consistency.