• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.4 no.2
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• pp.141-151
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• 2011

This paper aim at producing a Digital Modeling of the science of divination using a study of a new method with a mathematical function on "Lak-seo nine palace". For that goal, we must study a new law of moving forward and a new common difference on 'Lak-seo nine place'. We call this "the method of HLMF and NCD". Therefore, When drawing up 'a plan of Lak-seo nine palace', we will provide convenience in the field, so we don't make it by handwrite, but will produce it by a digital mode.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2017.05a
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• pp.358-359
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• 2017

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2017.05a
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• pp.360-361
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• 2017

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.997-1000
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• 2000

The purpose of this paper is to verify the appropriation of power electronics circuit by applying the most powerful and widely used simulator PSPICE and SIMULINK for adapted variable control technics. Power electronics librarys modeled and adapted to circuit. It is proved that simulation and excute are almost same.

• International Commerce and Information Review
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• v.1 no.2
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• pp.325-344
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• 1999

연구방법론의 관점에서 통상정보학은 매우 다양한 방법으로 접근이 가능하며, 특히 정보통신기술을 적극적으로 활용할 수 있기 때문에 향상 새로운 접근 방법이 출현할 수 있다. 또한, 정보기술의 급격한 발전으로 국제전자상거래가 급격히 확산되고 있는 현 시점에서 수출기업의 단순한 무역자동화 수준을 벗어난 국제간 B to B 전자상거래의 전략적 활용방안에 대한 연구가 필요한 때이다. 이에 본 연구에서는 통상정보학의 실용성 제고를 위한 구체적인 연구방향으로써 전략 정보시스템과 조직이론을 가미한 조직간 정보시스템 이론을 제시함으로써, 조직간의 전략적 연계를 통한 전략적 통합정보시스템 구축전략을 제시하고자 하였다. 이를 통하여 정보화의 이점을 통상학 분야에 도입하고, 전략적으로 활용 가치가 있는 정보를 생산, 저장, 유통 및 활용함으로써 학술적 비용발생을 최소화하며, 기업의 이윤 발생을 촉진함으로써 국가경쟁력의 확보에 기여할 수 있도록 하는 것이 통상정보학의 궁극적인 지향 목표이다.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2584-2586
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• 1999

The purpose of this paper is to verify the appropriation of power electronics circuit by applying the most powerful and widely used simulator PSPICE and SIMULINK for adapted variable control technics. Power semiconductor macro modeled by SIMULINK such as DC motor and AC induction motor. Furthermore DC motor & AC induction motor are modeled by PSPICE through their algorithms. For proved these modelings accurate, simulation techniques which are generally used in the field of power electronics circuits are adapted in power electronics and systems

• The Transactions of the Korean Institute of Electrical Engineers
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• v.33 no.9
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• pp.347-354
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• 1984

This paper presents a method of improving the power factor and , the waveform of A.C line currents and the output waveforms of AC to DC fully bridge converter systems which is achieved by connecting CON I.II and CON III.IV in series and parallel. The basic principle of the CON I.II.III.IV's operation is simple and feasibility of thease converter is proved by experiments. CON I and CON III are constructed of natural commutation, CON II and CON IV are constructed of forced commutation. The experimental results show that the power factor and waveform of the source currents and the output waveforms are improved by the method of connecting converter in series and parallel and driving it in I, II, III, IV quadrant.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.1013-1016
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• 2000

In this study, the estimate speed of rotor in the induction motor with Model Reference Adaptive control System (MARC) principle and to study that vector control system feedbacks speed estimated to speed control system and its result is as follows; Considering with explanation an influence of speed estimation mechanism depend on error about the second resistance size established, it estimates the deviation of the second resistance establishment and exhibits a compensation method, what is more, it designs a reparation program using the fuzzy algorithm and testifies the result with the computer simulation. And besides, it composes the load torque estimation and estimates the load torque, as the result, feedback-compensating the result of estimation, it improves the efficiency. In consequence, it makes a good result for more powerful vector control system about the outside trouble.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.31B no.11
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• pp.27-35
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• 1994

In this paper, a modified version of PRML is discussed to reduce nonlinearity in digital high-density storage devices. We propose a PRML with a nonlinear compensator which can reduce nonlinear interaction between the stored flux regions on the storage channel, and apply it to recording channels with three different densities. By comparing its performance with the existing PRML through computer simulation, we confirm that the nonlinear intersymbol interference increasing with high-density recording channels can be reduced effectively by the PRML with a nonlinear compensator.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.317-319
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• 2007

Recently, there were many researches for efficiency improvement of DSC. Among of these works, research of surface treatment is still a prerequisite for electron diffusion, light-harvesting and surface state of $DSC^{4)}$. Using of the surface treatment, it can be raise up porosity of $TiO_{2}$ nano-crystalline structure on $photo-electrode^{5)}$. There are chemical, physical, electrical and optical methods which raise up its porosity. In this paper, we have designed and manufactured MOPA-type ultrasonic circuit (100W, frequency and duty variable). Manufactured ultrasonic circuit to use to force cavity density and power into $TiO_{2}$ paste. Then, we have optimized forcing time, frequency and duty of ultrasonic irradiation for surface treatment of photo-electrode of DSC. In I-V characteristic test of DSC, ultrasonic and thermal treated DSC shows 19% improved its efficiency against established DSC.