• Proceedings of the KSR Conference
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• 2004.06a
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• pp.1482-1485
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• 2004

Electrostatic Precipitators have been used widely in industry, and play an important role in environmental protection. Electrostatic Precipitators (ESP) can be operated with a high collection efficiency and low pressure drop. Pulse energization is a technique to cope with high resistivity dust, and this results in lower power consumption. In this paper, Pulse energization ESP to use subway station air clean in subway station, design and test a pulse power supply for ESP.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.95-98
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• 2003

The objectives of the study are to analyze the impacts of rural road project on the social and economic activities of community people, offer basic data to perform evaluation of the project, and suggest future directions of the project. Research methodology adopted is a questionnaire method. There were interviewed 281 adult residents selected from 34 villages in Yeongdong-gun(mountainous), Miryang-si(middle), and Gochang-gun(plain). Results of the study are as follows: 1) Increase of income and land prices in mountainous and middle regions by the rural road project is higher than in plain; 2) Most inconvenient road expressed by the interviewee is the one linking farm and residence and 3) The problems of rural roads derived are narrowness, unpavement and partial pavement, unreliable maintenance, and long construction time. In order to meet the community needs on rural roads, it may be necessary that community people participate in the process of the project. And it is desirable to put priority on expanding and paving existing roads rather than constructing new one.

• Proceedings of the Korean Geotechical Society Conference
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• 2008.03a
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• pp.181-188
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• 2008

In this study, estimation of behavioral characteristics between twin tunnels was performed through the series of laboratory experiment on the small scale tunnel model. In the model test, the experimental parameters were geological conditions, center to center distance between twin tunnels, application of discontinuous inclination. To estimated behavior of pillar and load-displacement relationship by model tests and numerical analyses.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.03a
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• pp.1094-1103
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• 2010

The safety of pile foundation is getting declined when the pile foundation acting on lateral load is exposed by dredging. So appropriate reinforcement is needed for stability secure. Thus, in this study, the stability variation and reinforcement range caused by dredging is estimated on the basis of down scale test. The scale effect is determined by real scale numerical analysis. the behavior of pile by dredging stages is estimated by load control type. The credibility is verified through the comparison between down scale model test and numerical analysis.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2659-2661
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• 1999

This paper studies the scope and object of international standards related to power supplies and semiconductor convertors. IEC 60478 and IEC 60686 are international standards for stabilized power supplies with DC and AC output, respectively, and IEC 61204 for low-voltage power supply devices with DC output. IEC 60146 : Semiconductor Convertors is a representative international standard in the field of semiconductor convertors. In this field, there are some international standards such as IEC 60971. IEC 61136-1. IEC 61800. and etc.. In this paper, IEC 60686, 60971, 61136-1, and 61240 are mainly studied.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.12
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• pp.1449-1454
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• 2009

The performance variation of a multibody system is affected by a variation of various design variables of the system. And the effects of design variable variations on the performance variation must be considered in design of a multibody system. Accordingly, a variation analysis of a multibody system needs to be conducted in design of a multibody system. For a variation analysis of a performance, population mean and variance which are called statistical parameters of design variables are needed. However, an evaluation of statistical parameters of design variables is impossible in many practical cases. Therefore, an estimation of statistical parameters of the performance based on sample mean and variance which are called statistic of design variables is needed. In this paper, the variation analysis method for a multibody system based on design variable samples was proposed. And, using the proposed method, a variation analysis of the vehicle ride comfort based on sample statistic of design variables was conducted.

• Bulletin of the Korean Chemical Society
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• v.31 no.9
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• pp.2514-2518
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• 2010

A very simple synthetic route of a novel SATE prodrug type of 6'-fluoro-6'-methyl-5'-noradeonosine carbocyclic nucleoside phosphonic acid is described. The key fluorinated alcohol intermediate 7 was prepared from the epoxide intermediate 6a via selective ring-opening of epoxide. Coupling of 7 with $N^6$-bis-Boc-adenine under a Mitsunobu reaction followed by phosphonation and deprotection afforded the carbocyclic phosphonic acid. The chemical stability of the bis(SATE) derivative 13 was measured at neutral (pH 7.2) and slightly acidic (Milli-Q water, pH 5.5) pH. The antiviral activity test of the SATE prodrug 13 and its parent nucleoside phosphonic acid 11 were evaluated against HIV-1.

• Korean Journal of Head & Neck Oncology
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• v.8 no.1
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• pp.44-49
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• 1992

Malignant schwannoma is a rare tumor arising from the schwann sheath of the nerve fibers. It spreads early to reginal node and metastasis to the lung. Radical surgery have performed for treatment of choice but combined modalities such as radiotherapy or adjuvant chemotherapy have been recommanded recently. The authors experienced two cases of malignant schwannoma originating from the ethmoid sinus and ventricular fold of larynx. and we report these cases briefly.

• 한국초전도학회:학술대회논문집
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• v.14
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• pp.82-82
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• 2004

• 한국초전도학회:학술대회논문집
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• v.14
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• pp.93-93
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• 2004