• Corrugated packaging logistics
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• v.5 no.21
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• pp.144-146
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• 1998

• Product Safety
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• s.180
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• pp.26-29
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• 2008

• Journal of Korean Electronics
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• v.28 no.12
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• pp.52-54
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• 2008

• The Optical Journal
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• v.10 no.6 s.58
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• pp.29-33
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• 1998

• The Optical Journal
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• v.10 no.1 s.53
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• pp.58-65
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• 1998

• The Optical Journal
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• v.10 no.2 s.54
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• pp.65-67
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• 1998

• Korean Journal of Food Science and Technology
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• v.35 no.6
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• pp.1053-1059
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• 2003

This study aimed to determine the amount of vitamin C from vegetable & fruit juice by high performance liquid chromatograhy (HPLC). Components for estimation of measurement uncertainty associated with the analysis of vitamin C, such as standard weight, purity, molecular weight, dilution of standard solution, calibration curve, recovery, and precision, were importantly applied. The estimation of uncertainty obtained with systematic and random error based on the GUM (Guide to the expression of uncertainty in measurement) and EURACHEM document with mathematical calculation and statistical analysis. The components, evaluated ty either Type A or Type B methods, were combined to produce an overall value of uncertainty known as the combined standard uncertainty. An expanded uncertainty was obtained by multiplying the combined standard uncertainty with a coverage factor (k) calculated from the effective degree of freedom. The content of vitamin C from vegetable and fruit juice was 27.53 mg/100g and the expanded uncertainty by multiplying by the coverage factor (k, 2.06) was 0.63 mg/100g at a 95% confidence level. It was concluded that the main sources were, in order of recovery and precision, weight and purity of the reference material, dilution of the standard solution, and calibration curve. Careful experiments on other higher uncertainties is further needed in addition to better personal proficiency in sample analysis in terms of accuracy and precision.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.3
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• pp.298-305
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• 2008

From design to serial production, aircraft should go thorough complicated certification procedure from airworthiness authority such as Type Certificate, Production Certificate and Certificate of Airworthiness. On the other hand, aircraft components are mandated to receive Technical Standard Order Approval and Production Manufacture Approval before commercial use. As domestic aircraft and LRUs are currently under development, Bilateral Aviation Safety Agreement is promoted for the purpose of increasing aviation safety as well as foreign export. This paper describes the basic aircraft certification procedure and compares the difference in the certification system of US and Korea. Thorough this, it is attempted to suggest a requirements for establishing international certification system.

• Journal of Korea Ship Safrty Technology Authority
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• s.21
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• pp.89-100
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• 2006

중소형강선의 경우 제조검사 기준서의 내용중 그 절차와 세부기준이 없어 주관적인 검사가 이루어질 수지가 있는 부분이 있어, 검사기준별 세부기준이 필요한 항목을 검토분석, 관련기술 및 표준을 조사하여 객관적인 판단기준을 마련하고자 함. 본 보고서는 그 중 플럭스코어드와이어의 선정에 대한 지침과 주강품의 예열기준, 조립과 용접작업의 표준을 선급규정, IACS추천기준, KS규격, 그 외 표준에 대해서 조사하여 보편 타당한 기준을 제시하고자 한다.

• 전기의세계
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• v.16 no.1
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• pp.65-67
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• 1967

최근 전력수요의 급속한 증가는 전력기기 생산업체의 실력을 Test 할 절호의 기회를 만들어 주었다. 한영공업의 변압기는 송배전용, 또는 공업용으로 널리 쓰이는 용량 500-30,000kVA, 전압 154KV이하의 내철형을 표준품으로 제작하고 있다. 이런 정도의 용량의 변압기로서는 구조가 간단한 내철형이 중량도 가볍고, 표준화가 용이하며, 충격절연내력도 표준절연내력 자체가 그리 크지 않은데다, 구조상 내부전위진동 주기도 짧으므로 충분히 이것에 견디는 강도를 갖인것을 경제적으로 제조가능하다. 한영공업의 내철형변압기는 과거 80년 이상의 경험을 가진 세계적 제작업자인 Westinghouse의 기술지도와 엄선한 외국자재로서 고도의 신뢰성을 갖는 전력용변압기를 공급하게 된것이다.