• Natural Product Sciences
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• 제15권3호
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• pp.115-120
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• 2009

Woohwangcheongsimwon (WHCSW) is a traditional oriental medicinal fomula which has been clinically used for treating strokes, palpitation, loss of consciousness and anxiety. The purpose of this study was to characterize the putative anxiolytic properties of WHCSW using an elevated plus-maze (EPM) and hole-board test. Control mice were orally treated with an equal volume of vehicle (10% Tween 80 solution), and positive control mice were treated with diazepam (1 mg/kg, i.p.). In the EPM test, WHCSW significantly increased the percentage of time-spent in the open arms (200 mg/kg, P < 0.05) and the percentage of open arm entries (200 and 400 mg/kg, P < 0.05). WHCSW also significantly increased the number of head-dips in the hole-board test (200 mg/kg, P < 0.05). In addition, the anxiolytic properties of WHCSW examined in the EPM test were inhibited by flumazenil (10 mg/kg, i.p.), a GABA$_A$ antagonist. However, no changes in spontaneous locomotor activity or myorelaxant effects were observed versus 10% Tween 80 controls. These results suggested that WHCSW is an effective anxiolytic agent, and that its anxiolytic effects are mediated via GABA$_A$ receptors.

• 한방재활의학과학회지
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• 제29권1호
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• pp.63-73
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• 2019

Objectives The purpose of this study is to evaluate the safety of Ojeok-san extract powder and soft extract in healthy male volunteers. Methods Randomized controlled, cross over study was carried out in healthy male volunteers. Total 27 of 31 subjects meeting the inclusion criteria were enrolled and three subjects for waiting were included. To each group 12 subjects were randomly allocated by random number table. Group A took the extract powder in the first period and then took the soft extract in the second period. Group B took the medicine in the opposite order. Trial was conducted through two times of hospitalizations and all subjects had a seven-days of wash out period. Vital sign and laboratory test were checked before and after the medication. The mean difference of safety evaluation variables were analyzed by paired t-test (p<0.001) or wilcoxon signed rank test (p<0.05). The mean difference between two groups were analyzed by independent t-test (p<0.05) or Mann whitney test (p<0.05). Results As a result of all data related to vital sign and laboratory test in both group, There were no significant differences associated with the clinical trial drug between before and after the medication. And there was no adverse event associated with the clinical trial drug. Conclusions Both Ojeok-san extract powder and soft extract were found to be safe for healthy male volunteers.

• Corrosion Science and Technology
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• 제4권4호
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• pp.155-163
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• 2005

Heavy duty coating are required to have minimum durable period of 15 years under average usage environment because these paints are coated with purpose of anti-corrosion, antifouling, plastering etc. Onto steel structures constructed upon land and sea and other ferrous structures of electric power generation plants, electricity transmission towers, large structures of various plants, etc. Therefore we tried to estimate heavy duty coating longevity through reliability evaluation method and used combined cyclic anti-conrrosion test method composed of drying, moisturizing and salt spray as for accelerated life test to estimate longevity. Accelerated life test hours to heavy duty coating of first grade (with longevity not less than 15 years) specification may be obtained from troubleless test hours $t_n=\frac{B_p}{n^{1/\beta}}\left[\frac{1n(1-CL)}{1n(1-p)} \right]^{1/\beta}=19.671$ (yr) where shape parameter $\beta=1.1$, confidence level CL=80 %, warranty life $B_{10}=15$ yr and sampling size n=10 (2 sets). Because acceleration factor {AF} found by accelerated test is 41.7, accelerated life test hours required may be represented about 4,132 hr so that if this amount of hours is converted to number of cycles(6 hr/cycle) of complex cycle corrosion resistance test then the amount is tantamount about 690 cycles. That means if there does not occur trouble failure (with defect factor sum not more than 20) during when there is performed 690 cycles of combined cyclic anti-corrosion test to heavy duty coating specimen then it signifies that there can be warranted longevity $B_{10}$ of 15 yr under condition of confidence level CL=80 %.

• 한국방사선학회논문지
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• 제12권3호
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• pp.305-312
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• 2018

유리 표면에 방사성동위원소 $^{14}C$를 고착시키고 문지름 시험을 통해 시험용지별 전이 인자와 표면 형상을 관찰하여 방사성동위원소 누설 점검을 위한 건식 및 습식 문지름 시험법을 연구하였다. 건식 문지름 시험법은 티슈 용지가 종이 필터를 대체 가능할 정도로 2배 높은 전이 인자를 보였고, 습식 문지름 시험법은 종이 필터 용지가 티슈 용지에 비하여 3배 높은 전이 인자를 보였다. 일반적으로 누설 점검을 위해 종이 필터를 사용하고 있지만 건식 문지름 시험법에서 티슈 용지가 대안이 될 수 있음을 보였다.

• Tuberculosis and Respiratory Diseases
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• 제56권3호
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• pp.268-279
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• 2004

연구배경 : 결핵균 감염을 확인하는 방법으로 투베르쿨린 검사가 사용되고 있으나, 폐결핵을 진단하거나 배제하는데 유용성이 있는 지에 대해서는 아직까지 잘 알려져 있지 않았다. 본 연구는 폐결핵이 의심되지만 객담 도말 음성인 환자에서 투베르쿨린 검사가 폐결핵을 진단하거나 배제하는 것에 도움이 되는지와, 객담 도말 양성 환자에서 폐결핵과 NTM 폐질환을 감별하고자 할 때 도움이 되는 지를 알아보고자 하였다. 방 법 : 2002년 10월부터 2003년 8월까지 삼성서울병원 호흡기내과에 입원한 성인 환자 중 폐결핵이 감별진단에 포함된 환자 258명을 대상으로 투베르쿨린검사를 시행하여 그 결과를 분석하였다. 결 과 : 남자가 156명, 여자가 102명이었고 평균 연령은57.5세였다. 최종진단은 폐암 89명(34.5%), 폐결핵59명(22.9%), 폐렴 33명(12.8%), NTM 폐질환 24명(9.3%) 등이었다. 투베르쿨린 검사는 폐결핵 환자의 81.4%(48/59)와 비결핵성 폐질환 환자의 42.2%(84/199)에서 양성을 보였다(p<0.001). 객담 도말음성 환자 208명 중 결핵 환자의 69.4%(25/36)와 비결해성 폐질환 환자의 44.8%(77/172)에서 양성을 보여(p=0.007), 투베르쿨린 검사 양성이 폐결핵을 예측하는 민감도와 특이도는 각각 69.4%(25/36)와 55.2%(95/172)였고, 양성 예측치와 음성 예측치는 각각 24.5%(25/102)와 89.6%(95/106)였다. 폐결핵환자 31명과 NTM 폐질환 환자 19명 등 객담 도말 양성 환자 50명에서는 폐결핵 환자의 83.9%(26/31)와 NTM 폐질환 환자의 21.1%(4/15)에서 양성을 보여(p<0.001), 민감도와 특이도는 각각 83.9%(26/31)와 78.9%(15/19), 양성 예측치와 음성 예측치는 각각 86.7%(26/30)와 75.0%(15/20)였다. 결 론 : 투베르쿨린 검사는 폐결핵이 의심되지만 객담 도말 음성인 환자에서 폐결핵을 배제하는 데 그리고 도말 양성 환자에서는 폐결핵과 NTM 폐질환을 감별하는 데 임상적 유용성이 있을 것으로 사료된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1914-1917
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• 2005

Recently, the reliability evaluation and analysis are applied for many industrial products, and many products are required to guarantee in quality and in efficiency. The purpose of this paper is to present some of reliability evaluation methodologies that are applicable to machine tools. Especially ATC(Automatic Too Changer), which is core component of line center, was chosen as the target of the reliability evaluation and analysis. The scope of research is reliability prediction, reliability test and evaluates their results. The results of this research has shown the failure rate, MTBF(Mean Time Between Failure), reliability for those components and real tests reliability through constructed reliability test-bed. It is expected that proposed methodologies will increase reliability for high speed line center.

• Journal of Yeungnam Medical Science
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• 제14권2호
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• pp.474-482
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• 1997

There have been some case reports of the coexistence of extraadrenal pheochromocytoma and renal artery stenosis. Some reporters proposed that their coexistence may be associated through a common pathophysiological mechanism mediated by catecholamine secretion. Also some noted that trasient renal artery stenosis due to a spasm was induced by the catecholamines released from pheochromacytoma. We report a case of left paraaortic extraadrenal pheochromacytoma that had a transient oral captopril test positive result. After 5 days ${\alpha}$-antagonist reduced the vasospastic response of catecholamines. After surgical removal of the tumor, plasma catecholamines and urinary vanillyhnandelic acid concentrations as well as the blood pressure level, were restored to normal.

• International Journal of Precision Engineering and Manufacturing
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• 제8권3호
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• pp.50-53
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• 2007

Improving the reliability or long-term dependability of a system requires a different approach from the previous emphasis on short-term concerns. The purpose of this paper is to present a reliability evaluation method for an oil cooler intended for high-precision machining centers. The oil cooler system in question is a cooling device that minimizes the deformation caused from the heat generated by driving devices. This system is used for machine tools and semiconductor equipment. We predicted the reliability of the system based on the failure rate database and conducted the reliability test using a test-bed to evaluate the life of the oil cooler. The results provided an indication of the reliability of the system in terms of the failure rate and the MTBF of the oil cooler system and its components, as well as a distribution of the failure mode. These results will help increase the reliability of oil cooler systems. The evaluation method can also be used to determine the reliability of other machinery products.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2003년도 학술대회지
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• pp.181-184
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• 2003

The Four-Ball Tester has been widely used as a tool to charaterize lubricity for long time. In order to understand more acurate properties of lubricants, more test methods have been developed. Among the test methods, SRV test method was compared to Four-Ball Tester in this paper.

• 천문학회보
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• 제41권1호
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• pp.63.3-63.3
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• 2016

NYSC 1m telescope is completely assembled now, and equipped with FLI PL-16803 4k CCD and Shelyak eShel spectrograph (R~10,000) on optical system of f/8. From 12th Jan 2016, optical system alignment and test observations have been performed. We present the result of M35 photometric observation for the performance test of the 1m telescope. The photometric observation was carried out for the central part of M35 with the field of view, ${\sim}15^{\prime}.8{\times}15^{\prime}.8$. Standard transformation to the UBVI system was done by the photometric data of M35 in Sung and Bessell(1999).