• Electrical & Electronic Materials
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• v.9 no.4
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• pp.385-395
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• 1996

이 논문은 금속성 돌기물에 의한 불평등전계중에서의 비진동성과 진동성 임펄스전압에 의한 SF$_{6}$ 가스의 절연파괴 특성에 대해 기술하였다. 절연파괴전압-시간특성을 가스압 0.1-0.5MPa의 범위에서 정.부 극성의 전압을 인가하여 측정하였으며, 그리고 50.ohm.분류기를 통해서 전구방전 전류를 관측하였다. 가스압력에 의한 리이더 진전시간의 의존성도 측정하였다. 스트리머 코로나에 의해 발생하는 공간전하에 의한 국부전계강화는 시험갭의 전기적 절연파괴에 영향을 미치는 것으로 판명되었다. 절연파괴는 초기 스트리머 코로나로부터 발단되어, 국부전계강화에 의한 리이더진전으로 이루어진다.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.267-268
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• 2013

본 논문에서는 아날로그 필터회로의 신호 증폭비에 따른 센서리스 각추정 성능에 대해 분석 하였다. 신호 주입 센서리스에서 높은 주파수 신호 주입 방법이 선호되는데, 주입 주파수가 커질수록 시스템 임피던스가 증가한다. 따라서 낮은 주파수 주입방법과 동일한 각추정 성능을 얻기 위해서는 상대적으로 큰 주입전압이 필요하다. 특히 전동기의 돌극성이 작거나 ADC의 정밀도가 낮으면 각추정이 불가능한 경우도 존재 한다. 하지만 아날로그 필터회로를 이용하여 주입 주파수 신호를 증폭할 경우 작은 크기의 전압주입으로 각추정이 가능하다. 아날로그 대역통과필터의 신호 증폭비에 따른 최대 각에러 값을 모의 실험을 통해 비교하고, 실제 회로를 설계하여 센서리스 각추정 성능을 시험평가 하였다.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.19 no.1
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• pp.31-56
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• 1993

The characteristic aroma of Gardenia Absolute Oil made from Gardenia Jasminoides Ellis was investigated by GC and GC-MSD and by sensory evaluation The method of GC Analysis was used Double Column System by Carbowax 20M /SPB-1 of Pola/nonPola columns. And the result data of analysis was checked automatic Relent ion Indexs Match System by GC Workstation. A total of 51 compounds were identified in Gardenia Absolute Oil, including t entatively erstimated 9 compounds. The major components were Linalool, Farnesene of various form, Jasmin Lactone, Gamma undecalactone and Cis-3-hexone derivatives.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.1868-1869
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• 2005

이 논문은 반도전 실리콘 고무 표면에 코로나 방전 처리하여 이종의 실리콘 고무와의 접착 특성을 나타낸 것이다. 반도전 실리콘 고무 표면 상태를 발수성 등급에 따른 분류와 FTIR(Fourier Transform Infrared Spectroscopy)를 사용하여 평가하였다. 표면 상태 변화에 따른 반도전 실리콘 고무의 접착 특성은 T-peel test로 접착강도를 시험하였다. 실험 결과 고에너지의 코로나 방전으로 반도전 실리콘 고무의 결합쇄가 절단되었고 이 부분에 산소가 결합되어 극성 관능기를 생성하여 표면을 산화시켰다. 이러한 표면 상태 변화에 따른 접착강도는 초기 상태일 때 보다 코로나 방전 처리 후 증가하는 것을 확인 할 수 있었다. 이 논문을 통하여 코로나 방전 처리는 이종 계면의 접착 특성을 향상시킬 수 있으며, 이종 계면에서 발생하는 절연 파괴 전압을 높여 전기절연 성능을 향상시키는데 도움이 될 것이다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.15 no.6
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• pp.477-484
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• 2022

In this study, the cartridge part of the focused ultrasound stimulation system was used as a sample to conduct a skin irritation test and a skin sensitization test through animal experiments among the tests related to GLP (Good Laboratory Practice), a medical device safety evaluation standard. The test was conducted after IACUC approval using 6 female New Zeland White Rabbits. The polar and non-polar stimulation indices were all '0.0'. In addition, in the case of skin sensitization evaluation, 30 guinea pigs approved by IACUC were divided into control and experimental groups, and all induction and induction steps were applied using the eluate itself without separate dilution of the test sample and blank test solution. As a result of the experiment, the skin reaction grade of the control animal was 0 grade, and there was no animal showing more than 1 grade in the skin reaction of the test animal. As a result of both tests, no abnormal skin symptoms were observed, and when applied to the human body to treat patients, the test materials used in the tests will investigate the stability of whether any diseases that cause skin abnormal symptoms will occur.

• 한국지구물리탐사학회:학술대회논문집
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• 2006.06a
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• pp.9-14
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• 2006

Estimations of depth, magnetic orientation, and strength of dipole moments aid discrimination between unexploded ordnance (UXO) and non-UXO using magnetic surveys. Such estimations may be hindered by geologic noise, magnetic clutter, and overlapping tails of nearby dipole fields. An improved method of inversion for anomalies of single or multiple dipoles with arbitrary polarization was developed to include intra-inversion filtering and estimation of background field gradients. Data interpolated to grids are flagged so that only nodes nearest to measurement stations are used. To apply intra-inversion filtering to such data requires a gapped filter. Moreover, for data with significant gaps in coverage, or along the edges or corners of survey areas, intra-inversion filters must be appropriately modified. To that end, edge-adaptive and gapped gradient-nulling filters have been designed and tested. Applications are shown for magnetic field data from Chongcho Lake, Sokcho, Korea and the U. S. Army's Aberdeen Proving Ground in Maryland.

• KEPCO Journal on Electric Power and Energy
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• v.5 no.4
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• pp.249-256
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• 2019

A full-scale test line was established to verify the electrical environmental interferences caused by the HVDC ±500 kV Double Bipole overhead transmission line with metallic return conductor, which is scheduled for construction in Korea and the fullscale test was conducted for one year. And through the human perception test of the DC electric-field under the HVDC Double Bipole line, the threshold value at which the human detects DC electric field was investigated to verify the validity of the design guide for the HVDC ±500 kV Double Bipole overhead transmission line. The polarity configuration of the HVDC ±500 kV Double Bipole test line was arranged diagonally with the same polarity in terms of the electrical environment disturbance and operation. The test line utilized the 6-bundle arrangement to prevent the corona discharge taking into account the domestic social acceptability. The test results show that the HVDC ±500 kV Double Bipole transmission line generated very little corona discharge from the conductors. Therefore, both DC electric field and ion current density met the domestic design guide for DC overhead transmission lines. Also, the human perception test of DC electric fields under the test line showed that 70% of participants did not recognize the DC electric field even when exposed to 23 kV/m.

• Analytical Science and Technology
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• v.26 no.3
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• pp.174-181
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• 2013

Pyrifluquinazon is classified with a quinazoline insecticide that regulates food intake by controling the feeding behavior acting on the endocrine or nervous system of pests such as aphids and white fly. To keep safety on pyrifluquinazon residues in agricultural commodities a simple, accurate and rapid analytical method was developed and validated using high performance liquid chromatograph (HPLC-UVD). The pyrifluquinazon residues acidified with 1% formic acid in samples were extracted with acetonitrile and partitioned with hexane subsequently to dichloromethane then purified with silica solid phase extraction (SPE) cartridge. The purified samples were detected using HPLC-UVD. The method was validated using apple and pear spiked with pyrifluquinazon at 0.02, 0.05 and 0.1 mg/kg and hulled rice, pepper, soybean at 0.05 and 0.1 mg/kg. Average recoveries were 70.5~107.9% with relative standard deviation less than 10%. The result of recoveries and overall coefficient of variation of a laboratory results in Gwangju regional FDA and Daejeon regional FDA was followed with Codex guideline (CODEX CAC/GL 40). This method is appropriated at pyrifluquinazon residues determination and will be used as official method of analysis.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.8
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• pp.1700-1704
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• 2004

In this paper a novel power converter for some notches generation in the point of common coupling is described. The magnitude, width, polarity, and position of the notches generated by the proposed scheme can be varied arbitrary with simple control. The scheme has good features of simple structure, high reliability, low cost, high efficiency, and the capability of arbitrary several notches generation. The converter can be used for the test of custom power devices such as UPS, DVR, active power filter, etc. The circuit operation is described and the usefulness of the scheme is verified through simulations.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1993.04a
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• pp.107-107
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• 1993

결과 및 고찰: 이 약의 흰쥐에서의 체내동태는 혈중농도로 볼 때 2-exponential pharmacokinetics에 따르고, HPLC법으로 정량한 경우의 $T_1$/$_2$$\alpha$, $T_1$/$_2$$\beta$, AUC, C $L_{T}$, C $L_{R}$, V $D_{SS}$ 는 각각 1.90min, 21.89min, 1899.36$\mu\textrm{g}$ㆍmin/ml, 10.66ml/min/kg, 7.48ml/min/kg, 0.28l/kg으로 bioassay법과는 약간의 차이를 보였다. 분포특성은 간장과 신장에 많이 이행하였으며, 폐로의 이행도 적지만 관찰되었다. 이 약의 단백결합률은 그 농도가 31.3$\mu$M일 때 42.3%였고 water/n-octanol계에서의 유상으로의 분배는 거의 일어나지 않았다. 이 약의 분포용적이 작은 것은 단백결합 때문이라기보다는 높은 극성때문으로 추정되었다. 이 약의 C $L_{R}$은 GFR의 문헌치보다 컸으며 C $L_{T}$의 약 2/3을 차지하므로 약물소실에 있어서 신장의 기여도가 크고 신배설 과정에 신분비가 관여하고 있음을 알 수 있었다. 이런 사실은 CAZ나 CTX등의 기존 세파계 항생제들과 유사했으며, 추후 다회투여시와 용량의존적 체내동태에 관해 더 많은 연구가 필요하리라 생각되었다.되었다.