• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.917-920
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• 2005

전자문서보관소와 같이 대규모의 전자문서가 저장되는 시스템은 어떤 특정한 방법을 기준으로 해당 데이터를 저장한다. 이는 데이터의 저장, 검색, 송수신, 보안 요소 등 여러 가지 요구사항에서 기인하며, 이를 근거로 설계 되어야 한다. 본고에서는 현재 이슈가 되고 있는 전자문서보관소의 적합한 데이터 저장 방법에 대하여 알아보고 이를 안전하게 관리하기 위한 방법을 접근제어 측면에서 생각하여 보기로 한다.

• Transactions of the Korean Society of Automotive Engineers
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• v.7 no.5
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• pp.1-8
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• 1999

This paper describes the method for detection of the misfired cylinder by analysis of the variation of pressure occurred in exhaust manifold on an MPI gasoline engine. Misfired cylinder(s) cause a loss of power, an increase of fuel consumption and exhaust emission and vibration is caused by unsteady torque. Therefore early detection and correction of misfired cylinder(s) play a very important role in the proper performance and the exhaust emission. The method is a comparison of integration pressure index during the period of a blowdown in the displacement period. Experimental results showed that the method, using the variation of pressure in the exhaust manifold is proven to be effective in the detection of single cylinder or multiple cylinders misfire on the gasoline engine regardless of the engine revolutions. In addition, this method, using the variation of pressure in the exhaust manifold is a very easy and accurate method compared with other methods.

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.2
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• pp.1-7
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• 2003

This paper proposes a method to detect misfired cylinders by the exhaust pressure ascent rate. The misfire is generated by faults of electric system or faults of fuel delivery system. It is one of the abnormal combustions. Therefore, it increases the unburned hydrocarbon and the carbon monoxide and affects a bad influence to the 3-way catalyst. The misfire causes to decrease the power of the engine and increase the consumption of the fuel. Early detection and correction of the misfired cylinders can prevent these unusual phenomena. The misfired cylinders can be detected by the comparison of exhaust pressure ascent rate during each cycle. The exhaust pressure ascent rate is defined as pressure rise per time. Our experimental results showed that the proposed method is effective in the detection of the misfired cylinders on a gasoline engine regardless loads and revolutions of the engine.

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.763-765
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• 1988

Thermally stimulated current, cubical expension, capability change were measured by temperature variation. According to the capability change, TSC peak value was increased. We found that the crystal dissolution is 375 K and amorphous state becomes 388K. Charged partical behavior in the dipole and electronic trop were found iomic conduction in the low field and electronic conduction in the high field. Charged particle in the semiconduction storey was aceumulated in the interface by electron injection which can be arise TSC.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1988.10a
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• pp.33-35
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• 1988

From the study of mechanism of electrical conduction of film which is made from Polyethylene Terephthalate at very high temperature which is larger than low electric field and glass transition point, we find that there is a extraordinary non ohmic region (I∝V$^n$, 0

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1992.05a
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• pp.125-129
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• 1992

When relaxation time will be distributed, TSC observed in the experimental procedure was analysed by using a potential model having two equilibrium positions and equations of dielectric properties was derived. Calculation of distribution was made by matrix method and compared/confirmed values obtained by TSC and alternating current which have a correspondence with each other. In this measurement, distribution of activation energy and relaxation time was determined by TSC peak at around 147k/364 of which center is 10$\^$-4/ sec/10$\^$5/ sec respectively at room temperature and also obtained dielctric loss factor at the range of 10$\^$-7/-10$\^$5/Hz. It seems that low temperature peak is local dispersion and high temperature peak have a relation to dielectric transition of the material.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.13 no.3
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• pp.200-205
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• 2000

This paper describes the structure modeling and operation characteristics of MFMIS(metal-ferroelectric-metal-insulator-semiconductor) device using the Tsuprem4 which is a semiconductor device tool by Avanti. MFMIS device is being studied for nonvolatile memory application at various semiconductor laboratory but it is difficult to fabricate and analyze MFMIS devices using the semiconductor simulation tool: Tsuprem4, medici and etc. So the new library and new materials parameters for adjusting ferroelectric material and platinum electrodes in the tools are studied. In this paper structural model and operation characteristics of MFMIS devices are measured, which can be easily adopted to analysis of MFMIS device for nonvolatile memory device application.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.6 no.6
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• pp.23-31
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• 1992

Charged particle in the polymers is supposed to affect the electrical conduction and to lead them th dielectrical breakdown finally. So we measured the space charge distribution made by application of high electric field and evaluated the polarity of the charged particle affected on electrical conduction and space charge formed in the insulating materials by using temperature gradient thermally stimulated current measurement method(TG-TSC measurement). As a result, in the cross-linked polyethylene, A-peak was caused from dipole polarization, C-peak was caused from ionic space charge polarization and D-peak was injected trap hole. Also we found it crossible the evaluated the polarity of injected trap carrier and electron(or hole) of carrier trap in the cross-lined polyethylene. We found that ${\gamma}$-ray irradiated low density polyethylene had a relation to the electronic trap and we also could get the value of electric field distribution in the samples of which evaluation was available.

• Journal of the KSME
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• v.23 no.3
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• pp.153-156
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• 1983

최근 격변하고 있는 국제해운동정을 볼 때 정치적 측면에서 흔히 남북문제로 일컬어지고 있는 선후진국간을 치열한 경쟁문제, 공산국상선대의 활발한 진출, 각국의 자국선 보호주의의 강화문 제등이 산적해 있으며 선대절약형 경제성있는 선박으로 전환되고 있으며 대체에너지 개발에 따른 LNG, LPG,석탄전용선이 유망분야로 지목되어 선진해운국들은 서서히 이 분야로 선대편성을 시도하고 있는 점등, 국제해운환경은 복잡다난한 양상을 띄고 있는 것이다. 이러한 추세하에 1979년 제 2차 석유파동이후 격심한 불황속에 있는 해운계의 실정으로 미루어 이에 대처하기란 용이한 과제가 아닌 것이다. 여기에 정부와 업계가 혼연일체가 되어 국제경쟁력제고를 위한 제 발전전략이 적극 검토 추진되어야 함은 물론이고 우리의 목표가 기필코 달성되어 민족의 번영과 복지국가건립의 소망이 성취되기를 회원 여러분과 함께 기대하는 바이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.395-398
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• 2001

인터넷의 발달로 디지털화된 멀티미디어 데이터가 유통되기 시작하면서 저작권 보호에 대한 문제가 발생하였다. 저작권 보호를 위한 기술적인 대책으로 암호를 이용한 기법과 디지털 워터마킹 기술이 있다. 본 논문에서는 디지털 워터마킹 기술의 평가기준을 저작권 보호 제공 측면과 인증 및 무결성 제공 측면으로 분류하여 강인성, 안전성 및 효율성을 고려해서 도출하였다.