• 생명과학회지
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• 제28권2호
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• pp.153-161
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• 2018

흑생강의 기능성 극대화와 산업화를 위하여 건조방법과 혼합비를 달리한 흑생강 분말의 이화학적 특성과 항산화 활성을 비교 분석하였다. 시료의 조제는 열풍 및 동결건조시킨 흑생강 분말과 이들의 혼합비에 따라 각각 시료 "A" (8:2), "B" (5:5), "C" (2:8), "D" (10:0) 및 "E" (0:10)로 구분하였다. 시료의 수분흡수지수와 수분용해지수는 동결건조 시료에서 유의적으로 높았으며, 동결건조 시료의 비율이 클수록 수분흡수지수가 유의적으로 증가되는 경향이었다. 갈색물질의 함량은 동결건조에 비해 열풍건조한 시료에서 유의적으로 높았으나, 시료의 색차는 모든 시료에서 유의차가 없었다. 총당 및 환원당 함량은 열풍건조에 비해 동결건조 시료에서 유의적으로 높았는데, 혼합시료 중 총당은 동결건조 시료의 함량이 많아짐에 따라 유의적으로 증가되었다. 총 페놀 및 플라보노이드 함량은 동결건조보다 열풍건조 시료에서 많았으며, 혼합시료에서도 열풍건조 시료의 첨가량이 많을수록 유의적으로 증가되었다. Gingerol과 shogaol 함량은 혼합시료 "A"에서 유의적으로 높았으나, 6-gingerol은 건조방법에 따른 유의차가 없었다. 콜레스테롤 흡착활성은 동결건조 시료 "E"에서 유의적으로 높았다. DPPH 라디칼 소거활성은 건조방법에 따른 유의차가 적었으나, ABTS 라디칼 소거활성 및 환원력은 열풍건조 시료가 동결건조 시료에 비해 유의적으로 높았으며, 혼합시료에서는 "A"의 활성이 유의적으로 높았다. 따라서 열풍건조된 흑생강은 동결건조에 비해 품질이나 기능성 측면에서 우수하였으며, 특히 열풍 및 동결건조 시료를 8:2(w/w)로 혼합한 경우 기능성이나 산업성이 가장 우수한 것으로 판단되었다.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2013년도 춘계학술대회 논문집
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• pp.112-113
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• 2013

Thin CrAlMgSiN films, whose composition were 30.6Cr-11.1Al-7.3Mg-1.2Si-49.8N (at.%), were deposited on steel substrates in a cathodic arc plasma deposition system. They consisted of alternating crystalline Cr-N and AlMgSiN nanolayers. After oxidation at $800^{\circ}C$ for 200 h in air, a thin oxide layer formed by outward diffusion of Cr, Mg, Al, Fe, and N, and inward diffusion of O ions. Silicon ions were relatively immobile at $800^{\circ}C$. After oxidation at $900^{\circ}C$ for 10 h in air, a thin $Cr_2O_3$ layer containing dissolved ions of Al, Mg, Si, and Fe formed. Silicon ions became mobile at $900^{\circ}C$. After oxidation at $900^{\circ}C$ for 50 h in air, a thin $SiO_2-rich$ layer formed underneath the thin $Cr_2O_3$ layer. The film displayed good oxidation resistance. The main factor that decreased the oxidation resistance of the film was the outward diffusion and subsequent oxidation of Fe at the sample surface, particularly along the coated sample edge.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2006년도 추계학술대회 논문집
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• pp.193-195
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• 2006

• 한국환경보건학회지
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• 제21권4호
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• pp.63-74
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• 1995

The objective of this study were to identify the state of re. cognition and attitude of residents in Seoul city about air environment and to identify factors affecting attitude toward air environment. Study object was residents in Seoul city sampled by multistage random proportional sampling. Sample size was 0.0067%(500 persons) of total residents in Seoul city. The results were divided into two parts: (1) descriptive results of recognition and attitude toward air environment, (2) results of factor analysis to classify categories of attitudes toward air environment and regression analysis to identify factors affecting attitude toward air environment. Most of resident in Seoul city recognized that air environment in Seoul city was highly polluted and was not satisfactory. Experience of damage of air pollution was reported in about 70% of residents in Seoul city. More than 60% of residents in Seoul city had concern about air environment. Attitude toward air environment were classified into four categories using factor analysis: Necessity of intervention of local government for air environment conservation, Participation of residents and enterprises for air environment conservation, Optimistic attitude about air pollution, Preference of economy. Factors affecting the above attitudes were knowledge about air pollution, knowledge about policies and institutions related air environment conservation, concern about air environment, educational level, subjective assessment of air environment, sex, marital status. In conclusion this study suggested providing information of air environment in Seoul city to the residents and to educating residents for making positive attitude about air environment conservation.

• 한국식품영양과학회지
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• 제25권3호
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• pp.453-459
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• 1996

This study was carried out to determine the changes in quality during the drying process and the optimum drying condition for utilizing soybean curd residue. The quality criteria for soybean curd residue were acid value, peroxide value, fatty acid composition and microbial concentration. The acid values of soybean curd residue were 7.5, 4.5 and 5.9 KOH mg/g upon 12 hour drying with open-air sun, ambient-air blast and warm-air blast, respectively. The numbers of total aerobic bacteria and molds increased remarkably during drying with open-air sunlight, ambient-air blast and warm-air blast except for hot air blast. Among different drying methods, the hot air blast drying(1kg of sample) was the most effective methods, which completed in three hours. Also, the drying method demonstrated a typical drying curve ; settling down, constant rate drying and falling rate drying period were shown within one hour, from one and three hours and after three hours, respectively. Moreover, there was significant variation in the constant drying period for the quality of soybean curd residue.

• 한국식품과학회지
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• 제20권6호
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• pp.845-849
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• 1988

저장실, 저장상자, 공기분배장치 등을 포함한 실험실 규모의 저장실을 설계, 제작하였다. 과실류를 수용할 수 있는 저장상자(1.7 l)는 투명아크릴을 재질로 일정 공기가 계속해서 순환되도록 하고 저장실은 $0{\sim}30^{\circ}C$ 범위내에서 ${\pm}0.5^{\circ}C$의 정확도로 온도제어가 가능하였다. 저장상자로 유입되는 공기는 공기분배 장치를 통하여 예냉과 공기압의 균일화가 이루어지도록 하였고 Solenoid valve를 사용한 저장상자 선택장치를 제작하였다. 이와 같은 저장시설의 환경제어와 계측을 전담할 수 있는 마이크로프로셰서 시스템을 8 bit 마이크로프로쎄서와 기억장치, 그리고 입출력장치 등의 IC chip을 이용하여 설계 제작하였다. 동 시스템을 활용하기 위하여 저장환경의 제어를 위한 소프트웨어를 개발하고 운영프로그램을 ROM화 할 수 있었다. 제작된 저장 자동제어장치 시스템을 이용 밀감류 저장에 적용하여 저장시설의 운영 및 온도의 자료수집을 성공적으로 수행할 수 있었다.

• 한국식품영양과학회지
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• 제37권5호
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• pp.605-611
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• 2008

건조 방법이 와송의 항산화 활성에 미치는 영향을 밝히고자 와송을 천일건조, 열풍건조 및 동결건조한 후 물 및 95% 에탄올로 추출하여 항산화 활성을 분석하였다. 총 페놀 및 플라보노이드의 함량은 물보다 에탄올추출물에서 높았으며, 건조 방법에 따라서는 열풍건조 시료에서 유의적으로 높았다. 전자공여능, 환원력, hydroxyl radical 소거능, SOD 유사활성 및 아질산염 소거능은 열풍건조> 동결건조> 천일건조 시료의 순으로 높았으며, 물보다 에탄올추출물에서 항산화능이 높았다. 따라서 와송 추출물의 항산화능은 페놀화합물 및 플라보노이드 함량에 의존적인 것으로 생각되며, 와송의 항산화능을 증대시키기 위한 적절한 전처리 방법은 열풍건조 방법인 것으로 판단된다.

• 한국수산과학회지
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• 제7권3호
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• pp.163-168
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• 1974

진주담치의 건조중의 nucleotides의 변화를 알기 위하여 생체시료, 열풍건조시료 및 자숙열풍건조시료에 대하여 분석 검토하였다. 1. ATP 함양은 $8.2{\mu}moles/g(dry basis)$ 로서 높았고, 건조후외 잔존율도 $30\%$ 이상으로 많았다. 2. ADP 및 AMP는 건조중에 축적되는 결과를 보여 nucleotides 총량(ATP+ADP+AMP)으로 볼때는 건조중에 크게 감소하지 않았다. 3. 분획물중 UMP 및 adenosine이라고 추정되는 성분이 있었으나 동정하지 못하였다. 4. IMP의 생성은 볼 수 없어 AMP deaminase 활성은 없다고 보며, inosine 및 hypoxanthine 함양은 건조중에 증가하므로 adenosine deaminase 활성은 있다고 볼 수 있다. 5. 진주담치의 ATP 주분해경로는 그 분해생성물로부터 볼때 $ATP{\to}ADP{\to}AMP{\to}adenosine{\to}inosine{\to}hypoxanthine$이라고 추정된다.

• 한국항공운항학회지
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• 제21권4호
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• pp.77-89
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• 2013

The purpose of this study is to anticipate the air travel demands over the period of 164 months, from January 1997 to August 2010 using ARIMA-Intervention modeling on the selected sample data. The sample data is composed of the number of the passengers who in the domestic route for Jeju route. In the analysis work of this study, the past events which are assumed to have affected the demands for the air travel routes to Jeju in different periods were used as the intervention variables. The impacts of such variables were reflected in the presupposed demand. The intervention variables used in this study are, respectively, the World Cup event in 2002 (from May to June), 2003 SARS outbreak (from April to May), Tsunami in January 2005, and the influenza outbreak from October to December 2009. The result of the above mentioned analysis revealed that the negative intervention events, like a global outbreak of an epidemic did have negative impact on the air travel demands in a risk aversion by the users of the aviation services. However, in case of the negative intervention events in limited area, where there are possible substituting destinations for the tourists, the impact was positive in terms of the air travel demands for substituting destinations due to the rational expectation of the users as they searched for other options. Also in this study, it was discovered that there is not a binding correlation between a nation wide mega-event, such as the World Cup games in 2002, and the increased air travel demands over a short-term period.

• Mass Spectrometry Letters
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• 제11권4호
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• pp.95-102
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• 2020

In this study, we provide full descriptions of how to make a low-cost and completely open-source laboratory-made air sampler that will be used for sample adsorption for thermal desorption-gas chromatography mass spectrometry (TD-GC/MS) analysis. It is well known that harmful gases cause bad effects on human bodies, so it is necessary to identify the types and amounts of gases in industrial sites. One of the most commonly used methods for gas sampling is to utilize a sorbent tube using an air sampler. Commercially available air samplers are expensive, typically priced between $1,000 and $2,000, and their design often cannot be modified to fit the experiment. To address these shortcomings, we have developed a do-it-yourself (DIY) air sampler that is not only cheap enough, but also completely open-source. Furthermore, the performance of the fabricated air sampler was validated in conjunction with TD-GC/MS for the analysis of volatile compounds.