• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.378-383
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• 2003

현재 소규모 공장, 빌딩 등 대부분의 수용가에서 사용하고 있는 22.9kV 수ㆍ변전설비에서 발생한 감전사고의 최근 3년간('97∼'99년) 통계를 살펴보면, 매년 100여명의 감전재해자가 발생하였고, 이는 전체 감전사고의 11.3%를 차지하고 있어 타 설비에 비해 감전사고 점유율이 높음을 알 수 있다. 이들 사고원인을 분석하였을 때 대부분 COS 2차 모선과 변압기간의 충전부에서 84.4%가 발생한 것으로 나타났다.(중략)

• Proceedings of the Optical Society of Korea Conference
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• 1990.07a
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• pp.45-58
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• 1990

회전 편광자 영의 Spectroscople Ellipsometer를 제작하였다. 각 부품의 미소결함에 의한 오차를 추정하고 이들 각 부품의 미소결함이 Ellipsometric 상수들에 미치는 영향을 보정하여 정확도를 향상시키는 관련표현들을 유도하였다. Straight through operation에 대한 성능 평가 결과 파장 대역 400nm-600nm 내에서 tan$\psi$ 와 cos$\Delta$ 의 편차는 0.2% 내외로 만족할 만한 것으로 판단되었다. 광학 박막을 중심으로 Spectroscopic Ellipsomter를 사용한 연구에 대하여 실험예를 중심으로 논의하였다.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1595-1596
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• 2006

In this study electromagnetic fields under power lines were derived by dipole antenna theory and electric fields under high voltage power lines were discussed with dependence of power factor cos $\phi$. And also electromagnetic fields under 3 phase power lines with horizenal and vertical configurations were formulated.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1490-1491
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• 2007

The salt contamination on the distribution facilities, such as suspension insulator, line post insulator, lightning arrester, COS, is one of the major coastal areas because more than 90% of salt contaminated failure occurs in distribution facilities. Did to stain distribution facilities artificially according to Equivalent Salt Deposit Density(ESDD) grade. The electrical test were performed on the non-polluted and polluted facilities(ESDD B, C, D grade).

• Proceedings of the Zoological Society Korea Conference
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• 1999.10b
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• pp.291.2-291
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• 1999

No Abstract, See Full Text

• Archives of Pharmacal Research
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• v.20 no.5
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• pp.465-470
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• 1997

The human cDNA clone UDPGTh2, encoding a liver UDP-glucuronosyltransferase (UDPGT), was isolated from a .gamma.gt 11 cDNA library by hybridization to mouse transferase cDNA clone, UDPGTm1. The two clones had 74% nlicleotide sequence identities in the coding region. UDPGTh2 encoded a 529 amino acid protein with an amino terminus membrane-insertion signal peptide and a carboxyl terminus membrane-spanning region. In order to establish substrate specificity, the clone was inserted into the pSVL vector (pUDPGTh2) and expressed in COS 1 cells. Sixty potential substrates were tested using cells transfected with pUDPGTh2. The order of relative substrate activity was as follows: 4-hydroxyestrone > estriol >2-hydroxyestriol > 4-hydroxyestradiol > $6{\alpha}$-hydroxyestradiol >$5{\alpha}$-androstane-$3{\alpha}$, $11{\beta}$, $17{\beta}$-triol=5${\beta}$-androstane-$3{\alpha}$ ${\beta}$, $17{\beta}$-triol. There were only trace amounts of gulcuronidation of 2-hydroxyestradiol and 2-hydroxyestrone, and in contrast to other cloned transferase, no gulcuronidation of either the primary estrogens and androgens (estrone, $17{\beta}$estradiol/testosterone, androsterone) or any of the exogenous substrates tested was detected. A lineweaver-Burk plot of the effect of 4-hydroxystrone concentration on the velocity of glucuronidation showed an apparent Km of $13{\mu}M$. The unique specificity of this transferase might play an important role in regulating the level and activity of these potent and active estrogen metabolites.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.411-414
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• 2008

The study is about simulation of optical circuit for oneself performance evaluation of Fiber Optic Gyro(FOG) closed-loop controller board. The Fiber Optic Interferometer Simulator is used a digital signal processing for cosine response specificity output of fiber optic coil about input rate. Response specificity of the fiber optic coil is $Vo(t)=K3[1+\cos\{K1(Vm(t)-Vm(t-{\tau}))+K2\}]$. Also the Fiber Optic Interferometer Simulator is able to confirm a output value with K1, K2 and K3 input. The fiber Optic Interferometer Simulator is able to oneself performance evaluation without fiber optical circuit. Because, it is the very same cosine response specificity of real fiber optic coil about input rate.

• Journal of Ginseng Research
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• v.27 no.3
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• pp.93-97
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• 2003

Alternative or complementary medicine plays an important role in health care system. Ginseng, being one of the most popular oriental herbs, is believed to contain various steroid hormone activity. Ginseng has been demonstrated pharmacological effect in the cardiovascular, endocrine, central nervous, and immune system. Our objective was to study that total saponin might mediate some of their actions by binding to the steroid hormone receptor, as they share many of the actions of steroid hormone in various physiological system. Using total saponin from Panax Ginseng, we have studied the possibility of total saponin being a potential estrogen receptor, androgen receptor, and retinoic acid receptor ligand. Total saponin activated the transcription of both the estrogen and androgen responsive luciferase reporter plasmids at a concentration of 100$\mu\textrm{g}$/ml in COS cells transiently transfected with the corresponding receptor and hormone responsive receptor plasmids. And total saponin caused a concentration-dependent stimulation of estrogen receptor. Total saponin increased the expression of estrogen responsive c-fos proto-oncogene at the protein level in MCF7 cells at 24 h treatment as examined by Western analysis. The c-fos induction was used as a specific marker of estrogen responsiveness. This activation was inhibited by the specific estrogen receptor antagonist, ICI 182,780. However, total saponin failed to activate the retinoic acid receptor in COS cells transiently transfected with the corresponding receptor and retinoic acid responsive reporter plasmids. These results show that total saponin is capable of activating estrogen and androgen receptors.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.8A
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• pp.879-888
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• 2004

In this paper, we propose a real time QoS(Quality of Service) guaranteed transmission mechanism for MPEG video traffic at the congested node in IP based networks. Recent spread of the Internet has increased the demands of a real time multimedia service of the quality, Because the type of Internet services can, however, offer the best effort delivery strategies, it is difficult to treat all the types of traffic with differential COS (Class of Service). Most of all, the hierarchical coding method of MPEG data utilizes the reference frame for the motion prediction. The loss of the reference frames makes QoS of the video traffic degraded because the reference frame bit error causes the consecutive packet loss. Therefore we have studied the real time QoS guaranteed mechanism for video traffic by analyzing the previous methods. Computer simulation results show that the proposed scheme has better performance than the previous one.

• Journal of Korean Ophthalmic Optics Society
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• v.10 no.4
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• pp.273-281
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• 2005

The weight of spectacles fined on is resolved into its components along the nose's slide plane and the normal to the nose plane where the nosepad is located. The equation and its numerical solution to determine the component force was derived as a function of splay angle ${\Psi}$, $sin{\Psi}$, $cos{\Psi}$, and $cot{\Psi}$, incorporated with ${\theta}$ and ${\Phi}$, the angles viewed from side and front of the face, respectively. Values of inclination angle ${\theta}$ and ${\Phi}$ could be obtained to fulfill the condition where the frictional force between the nose and pad is either greater than the normal pressure exerted by the spectacles on the nose. With the value of ${\theta}$ fixed the normal pressure increases as ${\Phi}$ increases. With ${\Phi}$ fixed, the effect of ${\theta}$ is the same.