전통식품 품질인증 된장의 향기성분 분석

이장은(Jang-Eun Lee),강선희(Sun Hee Kang),김혜련(Hye Ryun Kim),임성일(Seong Il Lim) 한국식품영양과학회 2015 한국식품영양과학회지 Vol.44 No.6

본 연구는 국내 전통식품 품질인증 된장에 대한 휘발성 향기성분 특성을 분석하여 전통된장의 과학적 관리를 위한 기초자료를 마련하고자 수행되었다. 이를 위해 수집된 전통된장을 대상으로 headspace SPME-GC/MS 분석을 실시하고 전반적인 국내 유통 전통된장의 휘발성 성분 패턴을 분석하였다. 연구 결과 총 59종의 성분이 동정되었고 각각 acids 8종, alcohols 8종, aldehydes 8종, esters 15종, ketones 2종, phenols 4종, pyrazines 9종, miscellaneous 5종으로 확인되었다. 전통된장의 주요성분은 acid류, ester류, aldehyde류 및 pyrazine류였으며, 그중 acetic acid, ethyl alcohol, benzaldehyde, ethyl acetate, ethyl 2-methyl butanoate, 2,5-dimethylpyrazine 및 tetramethylpyrazine이 동정된 전통된장의 휘발성 성분 중 비교적 높은 강도를 차지하였다. 주성분 분석 결과 대부분의 전통된장은 기본적인 휘발성 향기성분의 조성이 유사한 것으로 나타났으나 isovaleric acid, 2-methylbenzaldehyde, tetramethylpyrazine, benzaldehyde, ethyl alcohol, ethyl caprylate, furfural, butanoic acid 성분들이 일부 된장에서 특이적으로 높아 이들 성분이 전통된장의 품질지표가 될 수 있을 것이라 보였다. 본 연구 결과는 전통식품 품질인증 된장에 대한 휘발성 향기 특성을 데이터베이스화하여 품질 현황을 파악하고 지속적인 품질관리를 통한 제품 발전의 방안으로 제시될 수 있을 것이다. The purpose of this study was to provide a basis for the management of traditional Doenjang by analyzing characteristics of volatile compounds in local Doenjang certified as a traditional food. The main compounds in Doenjang were acids, esters, aldehydes, and pyrazines, whereas relatively high intensities of acetic acid, ethyl alcohol, benzaldehyde, ethyl acetate, ethyl 2-methyl butanoate, 2,5-dimethyl pyrazine, and tetramethylpyrazine were detected among identified compounds. The analysis revealed that the composition of basic volatile compounds in Doenjang was similar, but isovaleric acid, 2-methylbenzaldehyde, tetramethylpyrazine, benzaldehyde, ethyl alcohol, ethyl caprylate, furfural and butanoic acid can serve as marker compounds for quality evaluation since they were specifically abundant in only some kinds of Doenjang. As a result, the quality status of Doenjang certified as a traditional food was determined by constructing a database of the volatile compounds, which can be suggested as a quality control method.

신뢰도 경로의 고장열거를 이용한 시스템 신뢰도 계산방법 연구

이장일(Jang-Il Lee),박기준(Kee-Jun Park),천환규(Hwan-Kyu Chun),정충민(Choong-Min Jeong),신동준(Dong-Jun Shin),서명원(Myung-Won Suh) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.6

항공기, 철도, 선박과 같은 대형 시스템들은 전기, 기계적으로 매우 복잡한 구조를 가졌으며 부품의 수명만을 고려한 기존의 유지보수에서 탈피하여, 고장분석의 시스템화를 통해 장치의 고유수명과는 관계없이 발생 가능한 우발고장도 대처할 수 있는 신뢰성 기반의 유지보수체계를 연구하여야 한다. 본 연구에서는 선행연구로 필요한 복합 시스템의 신뢰도 계산방법에 관한 연구이다. 복합 시스템의 신뢰도를 효과적으로 계산하기 위해 시스템의 RBD(Reliability Block Diagram)를 구성하고 인접행렬을 사용하여 RBD(Reliability Block Diagram)를 행렬로 표현한다. 또한 RBD(Reliability Block Diagram)행렬을 통하여 신뢰도 경로행렬과 고장열거 행렬을 구성하여 시스템의 신뢰도를 계산한다. 본 연구에서 제안한 알고리즘은 자동화, 시스템화가 가능하며 현재 개발하고 있는 신뢰도 정보관리 시스템 및 신뢰성 기반 유지보수 시스템에서 활용될 것이다. Recently, systems such as aircraft, trains and ships have become larger more complex. Therefore, the reliability calculation of these systems is more difficult. This paper presents a reliability calculation algorithm for a complex system with a solution that is difficult to analyze. When the system has a very complex structure, it is very difficult to find an analytical solution. In this case, we can assess system reliability using the failure enumeration method of the reliability path. In this research, we represent the reliability block diagram by an adjacent matrix and define the reliability path. We can find any system status by the failure enumeration of the reliability path, and thus we can calculate any kind of system reliability through this process. This result can be applied to RCM (Reliability-Centered Maintenance) and reliability information-management systems, in which the system reliability is composed of the reliabilities of individual parts.

상류 직관부 길이에 따른 오리피스 유량계 내 유동 특성에 관한 수치해석적 연구

이장일(Jang-il Lee),정애주(Ae-ju Cheong),민복기(Bok-ki Min) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12

In this numerical study, Commercial CFD(Computational Fluid Dynamics) code, ANSYS CFX ver. 15.0, is used to analyze the 3-Dimensional flow characteristics through orifice plate(β=0.6) in different plane with two 90 degree bends. The purpose of this numerical study is to evaluate measurement accuracy and flow characteristics of orifice flowmeter depending on upsteam straight length from 10D to 60D. Thus, calculation of pressure drop caused by swirl and distortion of axial velocity profile on orifice plate is conducted by using CFD. In addition, numerical analysis results are compared with ASME PTC 19.5 recommended straight length for orifice plates and nozzles. The results show that if upstream straight length of orifice plate is more than 32D, there was little deviation of differential pressure. Therefore, guideline of minimum upstream straight length recommended by ASME PTC 19.5 is somewhat strict.

벤츄리 유량계의 노즐부 편심에 따른 유량계측 오류에 관한 수치해석적 연구

이장일(Jang-il Lee),강순호(Soon-ho Kang),손동경(Dong-kyung Sohn) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12

재생온도와 외기조건 변화에 따른 제습 냉방시스템의 냉방 성능 및 엑서지 해석에 관한 연구

이장일(Jang Il Lee),홍석민(Seok Min Hong),변재기(Jae Ki Byun),최영돈(Young Don Choi),이대영(Dae Young Lee) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.5

제습 냉방시스템은 증발식 냉각기를 이용하여 공조 공기를 냉각하는 시스템으로 전기구동 냉각기 없이 열에너지만으로 냉방 공급을 수행할 수 있다. 따라서, CFC 계열의 냉매 사용에 의한 오존층 파괴 및 하절기 냉각기 가동에 의한 첨두 전력부하의 증가 등 기존의 냉방시스템이 야기하는 여러 가지 문제점들을 해결할 수 있다. 본 연구에서는 제습 냉방시스템의 효율을 향상시키기 위해 냉방 성능과 엑서지 해석을 수행하였다. 특히 열역학 제2법칙에 근거한 엑서지 해석을 이용할 경우 전체시스템과 구성요소에서의 엑서지 파괴의 원인을 분석함으로써 시스템의 효율과 관련된 주제에 대하여 더욱 본질적인 측면에서 접근할 수 있다. 본 연구의 목적은 재생온도와 외기조건의 변화에 따른 재생 증발식 냉각기를 이용한 제습 냉방시스템의 성능계수, 냉방용량, 엑서지 성능을 평가하는 것이다. Desiccant cooling system is an air conditioning system that uses evaporative cooler to cool air and it can perform cooling by using heat energy only without electrically charged cooler. Thus, it can solve many problems of present cooling system including the destruction of ozone layer due to the use of CFC[chloro fluoro carbon] affiliated refrigerants and increase of peak power during summer season. In this study, cooling performance and exergy analysis was conducted in order to increase efficiency of desiccant cooling system. Especially, using exergy analysis based on the second law of thermodynamics can resolve the issue related to system efficiency in a more fundamental way by analyzing the cause of exergy destruction both in whole system and each component. The purpose of this study is to evaluate COP[coefficient of performance], cooling capacity and exergy performance of desiccant cooling system incorporating a regenerative evaporative cooler in various regeneration temperature and outdoor air conditions.

실내 측위 결정을 위한 Figerprinting Bayesian 알고리즘

이장재(Jang Jae Lee),최조천(Jo-Cheon Choi),이정훈(Jeong Hoon Lee),윤석호(Seokho Yoon),이성로(Lee Seong Ro),오일환(Il Whan Oh) 한국통신학회 2010 한국통신학회 학술대회논문집 Vol.2010 No.6

재생 증발식 냉각기를 이용한 제습 냉방시스템의 엑서지 해석

이장일(Jang-Il Lee),변재기(Jae-Ki Byun),최영돈(Young-Don Choi),이대영(Dae-Young Lee) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6

Desiccant cooling system is an air conditioning system that uses evaporative cooler to cool air and it can perform cooling by using heat energy only without electrically charged cooler. Thus, it can solve many problems of present cooling system including the destruction of ozone layer due to the use of CFC affiliated refrigerants and increase of peak power during summer season. In this study, exergy analysis was conducted in order to increase efficiency of desiccant cooling system. Using exergy analysis based on the second law of thermodynamics can resolve the issue related to system efficiency in a more fundamental way by analyzing the cause of exergy destruction both in whole system and each component. In addition, exergy analysis allows us to identify and quantify the sites with destruction of exergy. The purpose of this study is to evaluate exergy performance of desiccant cooling system. In the end, we have found that Regenerative evaporative cooler has the greatest percentage of total exergy destruction with 75.57 followed by the direct evaporative cooler with 8.57 . Desiccant wheel, heating coil and sensible heat exchanger account for the remaining percentage of exergy destructions.

차세대 해안경계시스템에 관한 연구

이장일,신의수,차지은,Lee, Jang-Il,Shin, Eui-Soo,Cha, Ji-Eun 한국해양전략연구소 2022 해양안보 Vol.4 No.1

The Korean military is preparing for successful manpower reduction using advanced science and technology, in addition to carrying out the initiative of the Defense Innovation 4.0. Accordingly, studies on core technologies related to defense reform have been conducted both internally and externally in the military, and the corresponding results have also been applied. Nevertheless, compared to the development of such technologies, it is considered necessary to have more preparation for the policies related to the operation of the newly introduced equipment. As for the placement of personnel and the organization of time in service (TIS) with respect to the operation of surveillance equipment, there has been a tendency to sustain the conventional practice. Therefore, this study intends to suggest the schemes for facilitating policy improvements in the operation of manpower and security regulations in the field of information for the purpose of introducing a successful next-generation coastal guard system. To do this, the approach of this study was focused on the policies for the operation of the guard system. This is in contrast to previous studies that centered on its equipment and technologies. In addition, how to efficiently operate the guard system was also studied in view of cognitive science by deriving the most efficient time for a person to execute surveillance through the monitor based on the previous studies.

수요 및 생산특성에 따른 생산통제 기법간의 효율성 분석에 대한 연구

이장한(Jang Han Lee),정한일(Han-il Jeong),박진우(Jinwoo Park) 대한산업공학회 1997 대한산업공학회지 Vol.23 No.2

외기조건에 따른 재생 증발식 냉각기를 이용한 제습 냉방시스템의 에너지 및 엑서지 해석

이장일(Jang-il Lee),변재기(Jae-ki Byun),남기훈(Ki-hoon Nam),최영돈(Young-don Choi),이대영(Dae-young Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12

Desiccant cooling system is an air conditioning system that uses evaporative cooler to cool air and it can perform cooling by using heat energy only without electrically charged cooler. Thus, it can solve many problems of present cooling system including the destruction of ozone layer due to the use of CFC affiliated refrigerants and increase of peak power during summer season. In this study, exergy analysis was conducted in order to increase efficiency of desiccant cooling system. Using exergy analysis based on the second law of thermodynamics can resolve the issue related to system efficiency in a more fundamental way by analyzing the cause of exergy destruction both in whole system and each component. In addition, exergy analysis allows us to identify and quantify the sites with destruction of exergy. The purpose of this study is to evaluate COP, cooling capacity and exergy performance of desiccant cooling system in various outdoor air conditions.