• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.6
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• pp.1541-1546
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• 1993

To extend the widely used Gibson and Launder's second order closure model to the low-Reynolds-number region near a wall, modifications have been made for velocity pressure-gradient interaction and dissipation terms in the stress equations, and also for the dissipation rate equation. From the computation of fully developed plane channel flow, it is found that the results with present model agree well with the data of direct numerical simulation in the predictions of stress components. And, the computed mean velocity profile coincides with the universal velocity law.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.22 no.11
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• pp.1538-1546
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• 1998

The aim of this study is to investigate the characteristics of the catalytic burner to bum LPG and toluene alternately which can be applied to the dryer of an acryl coating process of textile. It was difficult to obtain complete conversion when the catalytic burner was installed to downward direction. The catalytic burner was improved by introducing the forced diffusion combustion air and the premixing air. The optimal operating conditions for the newly improved catalytic burner were obtained. The catalytic burner for toluene mixture was also investigated to incinerate toluene mixture exhausted from drying process. Results showed that the catalytic burner could oxidize toluene mixture completely at the proper operating conditions. Finally, the catalytic burner to bum LPG and toluene alternately was applied to the dryer of acryl coating. By using the catalytic burner, benefits of energy savings and environmental protection were obtained.

• Journal of the Korean Society of Clothing and Textiles
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• v.26 no.11
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• pp.1537-1546
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• 2002

The purpose of this study was to examine fashion counterfeit purchasing behavior among female college students.497 female college students living in Seoul were surveyed for this study. For data analysis, descriptive statistics, factor analysis, and t-test were used. As the results, approximately 54% of respondents had purchased fashion counterfeits before. Among fashion counterfeit products, handbag, apparels, shoes and accessories were frequently purchased by them. For materialism instrument, three factors of materialism were found and labeled as happiness, ownership, and economic factors. Three factors of shopping values were also identified as hedonic, utilitarian, and social shopping values. There were statistically significant differences between purchasing group and non-purchasing group in terms of materialism and shopping values; that is, those who had purchased fashion counterfeits showed higher scores on materialism and hedonic and social shopping value than those who had not.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.6
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• pp.1546-1553
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• 1998

In this paper, we investigate a human identification scheme using visual cryptography, which can decode concealed images without and crytographic computations. T.Katoh & H.Imai proposed a secret sharing scheme which can conceal two query images into one displayed image for the identification. the generalized construction of the share matrix is proposed to conceal the multiple query images by stacking user slides o the displayed image. Furthermore, an extended methodis proposed in which group of slides can conceal an independent secret image as well as the pairs of slides can.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.6
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• pp.1546-1553
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• 1996

The bit error probability of RS/trellis concatenated coded-modualtion system in the mobile radio channel is analyzed. A new upper bound to the symbol error probability of the inner TCM in the mobile radio channel is obtained by exploiting the unequal symbol error probability of the TCM. This bound is applied to the derivation of the upper bound to the bit error probability of the concatenated coded-modulation system. An efficient way of searching distance spectrum of the TCM in mobile radio channel is devised. Our new bounds are tighter than the earlier studied other bounds.

• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1546-1548
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• 1997

We investigated microhardness, friction, wear and wettability of polyimide for finding out the influence of ion implantation on surface properties. For increasing doses microhardness increased. A reduction of the friction coefficient was most cases correlated with a reduction of wear. The contact angles of water for $B^+$, $N^+$ implanted polyimide decreased from $76^{\circ}$ to zero, as the fluences increased energy of 50, 200 keV.

• Proceedings of the KIEE Conference
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• 1994.07b
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• pp.1543-1546
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• 1994

Ignitabilility of explosive gas mixture by spark of dry cell in case of short circuit by accident was studied for the purpose of evaluation of intrinsically safe characteristics of dry cell that manufactured in Korea. IEC type spark test apparatus, $21{\pm}2$ Vol% of hydrogen - air mixture, and dry cell that produced in Korea was used for the experiment. The result of this research could be used for design, manufacturing, and using the intrinsically safe electrical apparatus.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.1546-1549
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• 2009

In recent studies on tone reproduction with the objective of reproducing natural looking colors in digital images, an integrated multi-scale retinex (IMSR) has produced great naturalness in the resulting images. Most methods, including IMSR, work in RGB or quasi-RGB color spaces. As such, this produces hue distortion from the perspective of the human visual system. Accordingly, this paper proposes the hue preserved multi-scale Retinex (HPMSR) method to obtain a high contrast and naturalness. The proposed method enhanced the $L^*$ and saturation values in CIELAB color space. As a result, the visibility in dark shadows in the resulting images was improved.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1543-1546
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• 2002

PCS폰으로 Web service를 제공받으려면, 접속하는 서버측에 WML, HDML, CHTML, MIDP 등의 형식으로 작성된 문서가 있어야 한다. 따라서, 서버측에 HTML로 작성된 컨텐츠는 볼 수가 없었다. 이러한 문제점을 해결하기 위하여 플랫폼이 독립적이고 유 무선 지원과 보안이 강화된 어플리케이션 개발을 위하여 자바언어와 J2ME를 기반으로 CHMS를 설계하였다. CHMS(Converting HTML to MIDP System)는 ASP, JSP, Servlet 등으로 작성된 HTML형식의 문서를 J2ME Client(J2ME플렛폼)가 제공받게 한다. 또한 유 무선으로 서버측의 문서를 공동으로 접근, 관리하는 것이 가능하다. 본 논문은 무선을 지원하기 위해 기존의 많은 웹사이트들의 문서를 변형하는 어려움을 해결 할 수 있을 것이다.

• Bulletin of the Korean Chemical Society
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• v.30 no.7
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• pp.1543-1546
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• 2009

Temperature and frequency dependent AC conductivity behavior has been studied for the chemically synthesized polyaniline-polymannuronate (PANI-PM) composites. The temperature (300 - 500 K) and frequency (100 - $10^6$ Hz) dependent AC conductivity suggests evidence for the transport mechanism in PANI-PM composites. The frequency dependence of AC conductivity has been investigated by the power law. The frequency exponent (s) is determined, and the data suggest that s decreases with temperature. The variation of s with temperature suggests that AC conduction is due to the correlated barrier hopping.