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내부 전류 테스팅을 위한 내장형 전류감지기의 설계 및 구현
송근호,방만식,이효상,서정훈,김강철,한석붕 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1997 自動化 및 컴퓨터應用技術 Vol.4 No.1
This paper proposes a new BIC(Built-in Current sensor) for the internal current test in CMOS logic circuits. Our BIC is composed of current sensor, level shifter, comparator, and reference voltage circuit. The current sensor parallel connected with one diode and one nMOS device can convert the current of CUT(Circuit Under Test) to voltage. A single phase clock is employed in the BIC reduce the control circuitry of it and to perform a self-testing for a faulty current. The proposed BIC is verified by using the HSPICE simulator and fabricated in 0.8 ㎛ twin-tub process. The CUT is 4 bit full adder with bridging faults. The realized BIC successfully detects all bridging faults in CUT.
2,5-Xylidine 을 이용한 목재부후균으로부터 Laccase 효소의 유도
조남석,김영신,방명혁,최윤정,남장현,안드레레오노비취 한국목재공학회 1998 목재공학 Vol.26 No.3
Some white-rot fungi, screened at the Laboratory of Forest Products Microbiological Chemistry, Chungbuk National University were cultured and added the inducer of lactase enzyme, 2,5-xylidine. The fungi named by CB-13, CB-20, CB-99, CB-100 and CB-123 strains showed positive results in the decolorization of aromatic compounds, carminic acid and Rhemazol brilliant blue R. Concerned to the inducing effect of 2,5-xylidine on lactase activity, CB-20, CB-100 and CB-123 strains showed very high activity by addition of 2,5-xylidine, whilst CB-13, CB-99 and CB-124 strains produced relatively high lactase enzymes, regardless of inducer addition. There were no any lactase activities on CB-25, CB-64 and CB-139, even in addition of inducer. It is confirmed that some screened fungi have decolorizing ability on aromatic compounds, carminic acid and Rhemazol brilliant blue R. Also, the addition of inducer, 2,5-xylidine, has increased the activity of lactase enzyme which is secreted from some white-rot fungi.
Shear behavior of cross-laminated timber wall consisting of small panels
Oh, J. K.,Hong, J. P.,Kim, C. K.,Pang, S. J.,Lee, S. J.,Lee, J. J. Springer Science + Business Media 2017 Journal of wood science Vol.63 No.1
<P>A cross-laminated timber (CLT) wall plays the role of resisting shear stress induced by lateral forces as well as vertical load. Due to the press size, CLT panels have a limitation in size. To minimize the initial investment, some glulam manufactures wanted to make a shear wall element with small-size CLT panels and panel-to-panel connections and wanted to know whether the shear wall would have equivalent shear performance with the wall made of a single CLT panel. In this study, this was investigated by experiments and kinematic model analysis. Two shear walls made of small CLT panels were tested. The model showed a good agreement with test results in the envelope curve. Even though the shear walls were made of small panels, the global peak load did not decrease significantly compared with the wall made of a single CLT panel, but the global displacement showed a large increase. From this analysis, it was concluded that the shear wall can be designed with small CLT panels, but displacement should be designed carefully.</P>
Corrosion of Titanium Alloys in High Temperature Seawater
( J. J Pang ),( D. J. Blackwood ) 한국부식방식학회(구 한국부식학회) 2015 Corrosion Science and Technology Vol.14 No.4
Materials of choice for offshore structures and the marine industry have been increasingly favoring materials that offer high strength-to-weight ratios. One of the most promising families of light-weight materials is titanium alloys, but these do have two potential Achilles¡- heels: (i) the passive film may not form or may be unstable in low oxygen environments, leading to rapid corrosion; and (ii) titanium is a strong hydride former, making it vulnerable to hydrogen embrittlement (cracking) at high temperatures in low oxygen environments. Unfortunately, such environments exist at deep sea well-heads; temperatures can exceed 120 ¡ÆC, and oxygen levels can drop below 1 ppm. The present study demonstrates the results of investigations into the corrosion behavior of a range of titanium alloys, including newly developed alloys containing rare earth additions for refined microstructure and added strength, in artificial seawater over the temperature range of 25 ¡ÆC to 200 ¡ÆC. Tests include potentiodynamic polarization, crevice corrosion, and U-bend stress corrosion cracking.
Pang, S.K.,Lee, J.S.,Cho, H.,Sohn, J.Y.,Cho, S. SAGE Publications 2008 Indoor and Built Environment Vol.17 No.6
<P>This study evaluated the indoor air quality in 36 new apartment houses in six big cities in Korea from July 2005 to January 2006. Most of the indoor finishing materials in the new houses were environment-friendly and designated by the Korea Air Cleaning & Researching Association. In the new apartments, which were all built with the same finishing materials, air levels of toluene averaged 1475 μg · m<SUP>-3</SUP> in summer, when there were relatively high temperatures and humidity, and averaged 2711 μg· m<SUP>-3</SUP> in winter. In addition, benzene, ethylbenzene, styrene, xylene, and formaldehyde measured 9.99, 628, 232, 2392 and 951μg·m<SUP>-3</SUP> in summer and 9.99, 628, 232, 2392, and 951μg·m<SUP>-3</SUP> in winter, respectively. Concentrations of volatile organic compounds (VOCs) and formaldehyde were increased as indoor temperature and humidity increased. This study evaluated concentrations of VOCs compounds in a room according to season using enthalpy, which considers two indexes, temperature and humidity. Concentrations of benzene, ethylbenzene, styrene, xylene, and formaldehyde increased with increased enthalpy.</P>
Moon, J.-H.,Pang, I.-C.,Yoon, J.-H. Pergamon Press ; Elsevier Science Ltd 2009 Continental shelf research Vol.29 No.13
The Changjiang diluted water (CDW) around Jeju Island between 2002 and 2006 in response to external forcings, such as wind, tidal forcing and low river discharge, is studied using a three-dimensional model. The model results suggest that wind largely determines spatial differences of CDW and the freshwater export toward Jeju Island between two years. In 2006, when northwestward wind blows during mid June to mid August, the wind-induced Ekman flow causes a broad northeastward extension of CDW and carries a significant amount of freshwater northeastward Jeju Island in August. On the other hand, in 2002 northward wind during mid July to early August drives the CDW to the southwest of Jeju Island, and thereafter the CDW is mainly advected northeastward along the Cheju Current during mid August when the wind becomes weak. Therefore, the amount of freshwater around Jeju Island increases in September, not in August. The response to tidal forcing shows that tide-induced vertical mixing tends to enhance a meander of CDW around Changjiang Bank and shift the CDW flowing into the Yellow Sea southeastward toward Jeju Island. As a result, the amount of freshwater toward Jeju Island becomes larger than that in no-tides case. The summer low river discharge as a flood control scenario has little influence on the spatial behavior of CDW around Jeju Island although the discharge contributes to the amount of freshwater around Jeju Island.
Du, J.,Zhao, G.,Pang, H.,Qian, Y.,Liu, H.,Kang, D.J. North-Holland 2013 Materials letters Vol.93 No.-
Porous Sn-doped TiO<SUB>2</SUB> monoliths were fabricated with polystyrene spheres as a template using a sol-gel method, and followed by calcination at high temperature. Sn doping can suppress the electron/hole recombination through facilitating charge rectification. And its porous structure can provide large surface areas, leading to more adsorption and fast transfer of pollutants. The Sn-doped TiO<SUB>2</SUB> monoliths were characterized by XRD, SEM and BET measurements. In order to evaluate the photocatalytic activity of porous Sn-doped TiO<SUB>2</SUB> monoliths, the photodegradation for methyl orange was performed under UV-vis irradiation. At the same conditions, porous Sn-doped TiO<SUB>2</SUB> monoliths showed the better behavior of photodecomposition for organic compounds than Degussa P25.