• 한국산학기술학회논문지
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• 제15권9호
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• pp.5820-5825
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• 2014

본 연구에서는 급기 가압 제연구역 출입문의 개방력 기준을 실측하여 한국인의 체형에 적합한지 여부를 검증하였다. 개방력 기준의 검증은 기술표준원의 인체표준정보를 근거로 NFSC 501A, NFPA 92A 및 BS-EN 12101-6와 비교하였다. 개방력을 측정할 때 인체의 자세는 일어서서 오른손으로 출입문을 미는 것을 기준으로 하였다. 실측한 값을 분석한 결과 30대 남성 및 여성이 미는 힘의 최대값을 나타냈고, 60대에서 최소값을 나타냈다. 또한 모든 연령에서 미는 힘의 편차가 크게 발생한 것으로 확인되었다. NFSC 501A 와 비교한 결과 남성은 20대, 30대, 50대를 제외한 모든 성별과 연령에서 기준보다 낮은 값을 나타냈다. 또한 NFPA 92A 의 기준과 비교할 때 모든 성별과 연령에서 측정치의 평균이 기준보다 낮다. 그리고 BS-EN 12101-6 의 기준과 비교할 때 남성은 모든 연령에서 기준보다 높았으며, 여성은 모든 연령에서 기준보다 낮은 것으로 측정되었다. 따라서 신체적 조건이 외국인과 다른 한국인의 체형을 고려할 때 현재 적용되고 있는 제연구역 출입문의 개방력의 국내 기준 110 N은 하향 조정할 필요가 있는 것으로 판단된다. 또한 국제 기준을 임의로 사용하는 것도 문제가 있으므로 건축물과 사용자의 특성을 고려한 기준의 적용이 필요하다는 것을 제안하고자 한다.

• Journal of Radiation Protection and Research
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• 제35권4호
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• pp.151-156
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• 2010

국내 $^{18}F$-FDG 방사성의약품의 품질관리 시험성적서에 기록되는 시험항목의 종류는 성상, 반감기, 방사성 이핵종, 방사 화학적 확인(Rf값 측정), 방사화학적 순도, Ethanol, Acetonitrile, Kryptofix, Aluminium, pH, Endotoxin, 무균시험, 실용량으로 총 13종류로 나타났다. '성상', '방사성 이핵종', 'pH', 'Endotoxin', '무균시험'에 대해서만 모두 기록하는 것으로 나타났고, '반감기', '방사화학적 확인(Rf값 확인), '방사화학적 순도', 'Ethanol', 'Acetonitrile', 'Kryptofix', 'Aluminium', '실용량'은 방사성의약품 제조기관 마다 기록여부에 차이가 있는 것으로 나타났다. 시험판정 결과는 품질관리 시험항목이 기록된 자료를 근거로 총 13개 항목 모두 100% 적합한 것으로 나타났다. 연구소에서 제조하는 $^{18}F$-FDG 방사성의약품의 품질관리 시험항목이 병원과 기업보다 많았고 방사성의약품의 시험항목수가 많은 것이 적은 것보다 안정성 확보에 대한 신뢰성을 높일수 있는 방법이므로 이에 대한 보완이 필요하다고 본다. 국내의 경우 방사성의약품의 안전성을 나타내는 품질관리 시험성적서의 시험항목은 제조기관마다 차이가 나고 표준화되어 있지 않는 것으로 나타나 이에 대한 보완이 필요하다고 본다. $^{18}F$-FDG 방사성의약품의 품질보증을 위한 표준화된 품질관리 시험성적서의 제시를 위해 미국의 GMP와 유럽의 CE Mark를 참고하고 전문가 자문을 통해 국내 실정에 맞는 기준으로 표준화해야 한다고 본다.

• 대한본초학회지
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• 제24권4호
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• pp.63-67
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• 2009

Objectives : Quality control for imported medicinal herbs is duty for regulation, however to the best of our knowledge there has been no report regarding quality control of imported ones. Therefore, this study investigated the data of imported ones for monitoring quality issue. Methods : These data are categorized according to item, the amount of import, country, inspection item, suitability, and incongruity reason based on the 248 results performed by KIOM. Results : China is the number one country for import with the value of 73%. Inspected medicinal herbs were 139 species, among them Poria is ranked as top for requested number and the amount of import. The amount of import is similar between high ranking 20 species and low ranking 119 ones, showing high ranking ones are major. The incongruity ratio was 7.7% from the total number of inspected items, the reason for incongruity was excess of tolerable amount of Cd residue. Conclusions : From the data, it is effective way to focus on high ranking herbs for evaluating imported herbs for quality control. The study of mechanism on Cd accumulation and its decrease is essential for environmental matter. And identification and storage for mixed used and easily decomposable herbs are remained for further study. Our study might be small step for showing guideline for proper quality control.

• 한국농공학회지
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• 제33권4호
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• pp.84-95
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• 1991

The compaction ratio of the field dry density to the maximum dry density is generally adopted as the index of quality control for embankment of earthfill structures such as Earth Dam, Sea Dike, River Bank and Road. In case of coarse materials are included in the earth material, the compaction ratio will be varied in wide range since the dry density is influenced by quantity of coarse material in the soil. The treatment for the coarse material should be controlled carefully in testing. In this study, the compaction characteristics of the soil contained the coarse materials were researched and calibration of the suitability of field quality control methods were carried out. 28 Samples were made of clay(CL) and sandy soil (SM) mixed with gravel whose content were 0, 4, 6, 8, 10, 12, 15, 20, 25, 30, 35, 40, 45, and 60% in Weight. The compaction characteristics depending on the coarse material content were analysed through 4 types of compaction tests which are A-1, B-i, C-i and D-1. The adjusting coefficients for density and moisture content namely a and ${\beta}$ respectively were proposed in order to consider the effects depending on content of the coarse materials. The test methods to control reasonably and promptly the quality of earthfill were proposed after analysing the ranges of possible errors on the relative compaction ratio between laboratory compaction methods and field density testing methods.

• 한국농공학회지
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• 제37권1호
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• pp.49-54
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• 1995

Three types of floating-type automatic inlet were developed for the purpose of reduc- ing farmer's working hours required for water management and saving irrigation water. The point of automation is to use a float within the inlet which is floated and sinked by the ponding depth of paddy field, Thus opens and closes the control gate of irrigation. Suitability of each inlet may depend on production cost, applicability to paddy field condi- tions, and feasibility to farmers, etc. The first model was composed of three parts : chamber for irrigation control gate, chamber for float controlled by ponding depth, and connection bar between the two parts. It was designed to open and close the control gate gradually as the ponding depth drops and rises to a certain level. The second model was designed to improve the weak point of the first model which is the imperfect-closing of gate when it approaches to the end of ir- rigation. A switch-spring was equipped above the connection bar for perfect opening and closing of gate when the ponding depth reaches to a certain level. The third model was designed by combining the two chambers, that is, cut in halves the inlet volume of the above two models. Magnets were equipped above the float for perfect opening and closing gate. The functional experiment for three developed inlets was successfully carried out and the rating curves were derived.

• 한국토양비료학회지
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• 제49권5호
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• pp.440-448
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• 2016

Nonpoint sources of pollution (NPS) is defined as diffuse discharges of pollutants (e.g., nutrient, pesticide, sediment, and enteric microorganism) throughout the natural environment and they are associated with a variety of farming practices. Previous studies found that water soluble anionic polyacrylamide (PAM) is one of the highly effective measures for enhancing infiltration, reducing runoff, preventing erosion, controlling nonpoint source of pollutants, and eventually protecting soil and water environment. Potential benefits of PAM treatment in agricultural soil and water environments have been revealed by many research and they include low cost, easy and quick application, and suitability for use with other Best Management Practices (BMPs) for NPS control. This study reviews the various applications of PAM and discusses its further potentials in agricultural environment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1096-1098
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• 2003

In this paper, the control algorithm and control methods for a combined system of shunt passive filter and series active filter in 3-phase 4-wire system are discussed. Moreover, the 3-phase 4-wire system is widely employed in distributing electric energy to several office building and manufacturing plants. In such systems, the third harmonic and odd multiples of $3^{rd}$($9^{th}$, $15^{th}$, etc.) are termed as triple and zero sequence components that do not cancel each other in the system neutral. As a result, the triple harmonics add together creating a primary source of excessive neutral current. Regarding this concern, this paper presents a new control scheme for a series hybrid active system. This series active power filter acts not only as a harmonic compensator but also as a harmonic isolator. Hence the required rating of the series active filter is much smaller than that of a conventional shunt active filter. However, the performance of the combined system is greatly influenced by the filtering algorithm employed in the active power filter. This paper proposes a series active power filter scheme based on performance function. Some experiments was executed and experimental results from a prototype active power filter confirm the suitability of the proposed approach.

• Journal of Animal Science and Technology
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• 제59권3호
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• pp.5.1-5.10
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• 2017

Background: Bovine respiratory disease (BRD) is one of the leading causes of economic losses in the beef and dairy industry. Reliable antemortem tools for diagnosing BRD would improve the efficacy of treatment and reduce costs. Here we examined whether the relatively simple technique of thoracoscopy can support BRD diagnosis under field conditions. We also compared various equipment set-ups in order to optimize the safety and efficacy of the procedure. A total of 24 thoracoscopic procedures were performed in 17 calves diagnosed with BRD and in 2 healthy control calves. Rigid and flexible endoscopes and industrial videoscopes were tested using various insertion approaches. The suitability of the technique was assessed in terms of duration, volume of air extracted, visualization score, and image quality. Safety was assessed in terms of rectal temperature, body weight, breaths/min, presence of fibrinogen, pain score, recovery time, intraoperative complications and risk of laceration or threatening collapse. Results: Insertion of a flexible endoscope via a right, dorso-caudal approach at the $5^{th}$ intercostal space allowed complete examination of the right lung in 15 min, as well as identification of main lung lesions and adherences in calves with BRD, without compromising calf welfare. While the dorso-caudal approach was optimal, it was associated with substantial discomfort when rigid endoscopes were used, minimal complications or mortality due to thoracoscopy were observed up to 28 days after the procedure. Videoscopes were as safe and easy to use as endoscopes, but endoscopes provided better image quality. Conclusion: This study provides the first field evidence that thoracoscopy can be safe to explore BRD-diseased calves. These results justify a larger study to rigorously assess the diagnostic performance of the technique.

• 비파괴검사학회지
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• 제20권5호
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• pp.431-437
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• 2000

표준시험편이란 재질, 형상, 치수 및 성능이 권위 있는 기관에 위해 검정된 국제적인 시험편을 말하며 이것은 탐상기의 특성시험 또는 감도조정, 시간축의 측정범위 조정에 사용된다. 그런데 이 표준시험편은 초음파탐상 결과에 아주 크게 영향을 미치는 하나의 변수로 ASTM 이나 JIS에서는 이들 표준시험편의 규격, 재질 및 성분 등을 엄격하게 규격화하고 있다. 그 이유는 이들 성질들이 감도와 분해능 및 재현성에 아주 큰 영향을 미치기 때문이다. 따라서 결함의 크기 및 치수를 정량화하고 재현성 있는 결과를 얻기 위해서는 엄격한 품질의 표준시험편이 요구되고 있다. 그러나 ASTM 또는 JIS등의 규격품들은 상당히 고가이며 시중에는 품질이 검증되지 않은 표준시험편들이 일부 사용되고 있는 실정에 있고 이들 시험편의 품질 및 사용 적합성을 재고하기 위하여 각종 규격에 비추어 보고, 규격품들과 비규격품의 각종 성질들을 비교하여 그 사용 안정성을 고찰하고자 하였다. 그 결과 비규격품들은 치수 및 성분에서 많은 문제점을 안고있으며 비규격품들을 검증없이 사용할 경우 피검물내의 결함의 위치나 크기 측정에 오차를 유발할 가능성을 확인하였다.

• 항공우주시스템공학회지
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• 제18권1호
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• pp.79-87
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• 2024

한국형발사체(KSLV-II, 누리호)는 상용의 항공유를 발사체 연료로 사용한다. 한국형발사체에 적용된 연료유 규격은 항공유 규격에서 도입하였지만, 수분과 미립 협잡물 규격과 분석 방식은 편의성과 정확성을 위해 디지털 방식으로 변환하였다. 연료유 관리를 위해 입고, 저장, 사용 단계마다 검사하여 적합성을 판단하는 연료유 관리시스템을 구축하였으며, 이를 위해 나로우주센터에 분석실을 구축하였다. 입고 검사로 연료유의 혼유 가능성을 차단하고, 저장 검사로 장기간 성분 변화를 관찰했으며, 사용 전 검사를 통해 엔진 시험이나 발사체 시험의 연료유 적합성을 판단하였다. 장기간의 분석 결과로 우주센터의 연료유 저장 방식이 적절함을 확인하였고, 관리시스템으로 수백 번의 엔진 시험과 여러 차례의 비행시험에 대응할 수 있었다.