• 대한본초학회지
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• 제30권3호
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• pp.77-82
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• 2015

Objectives : The Korean medical doctors use PMR(Polygoni Multiflori Radix) for nourishing the liver-kidney, loosing the bowel to relieve constipation, recovering from malaria, and clearing away heat and eliminating toxin, etc. But, this study was performed to investigate the effect of water extracts from PMR on prevention of hyperlipidemia and liver damage induced by alcohol. Methods ： Except for the normal group, we fed rat on 25% alcohol for 55 days. And the extract was administrated for the same period. We measured the serum components in rat's blood, body weight and weight of liver. Results ： At first, we observed effects of PMR on prevention of hyperlipidemia induced by alcohol. PMR group showed significant decrease of total cholesterol and triglyceride in comparison with those of the control group. PMR group showed significant increase of body weight in comparison with those of the control group in 4weeks and 8weeks. At second, we observed effects of PMR on prevention of liver damage induced by alcohol. PMR group showed significant decrease of GOT, GPT, ALP, and LDH in comparison with those of the control group. PMR group showed significant increase of liver weight in comparison with those of the control group. Conclusions ： Reviewing these experimental results, it appears that water extracts from PMR have pharmaceutical efficacy on prevention of hyperlipidemia and liver damage induced by alcohol. Therefore further additional study should be conducted to elucidate in depth the pharmaceutical efficacy of these.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제6권12호
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• pp.487-496
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• 2017

MySQL InnoDB에서는 데이터를 기록할 때, 테이블마다 테이블스페이스를 분할 생성하여 개별적으로 저장하는 방법과 모든 테이블 및 인덱스 정보를 단일 시스템 테이블스페이스에 저장하는 방법이 있다. 그리고 이렇게 기록된 정보들을 이용해 삭제된 데이터를 레코드 단위로 복구하는 것이 가능하다. 하지만 현재 진행된 대부분의 데이터베이스 포렌식 연구에서 전자의 경우는 연구가 활발하게 이루어져 그 구조에 대한 분석이 많이 이루어졌지만, 후자에 대해서는 아직 공개된 정보가 포렌식에 활용되기엔 충분치 않다. 위의 두 방식은 각각의 저장 구조가 서로 다르기 때문에 데이터베이스 포렌식 관점에서 본다면 둘 모두에 대한 분석이 이루어져야 한다. 본 논문에서는 단일 시스템 테이블스페이스인 IBDATA 파일에 레코드를 저장하는 방식에서의 삭제된 레코드 복구 방법을 제시한다. IBDATA 파일을 분석하여 그 구조를 밝히고 이를 활용하여 기존에 고려되지 않았던 미할당 페이지 영역까지 확장한 삭제 레코드 복구 알고리즘을 소개한다. 또한, 알고리즘을 도구로 구현하여 실제 데이터를 이용한 검증을 통해 기존 방법보다 복구율이 68%까지 향상되었음을 보인다.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제9권4호
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• pp.123-128
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• 2020

디지털 기기 사용이 일반화되면서 수사 과정에서 물적 증거 수집을 위해 디지털 포렌식 기법을 사용한다. 이 중 파일 포렌식 기법은 삭제된 파일을 복구하는 것으로, 여러 개의 파일로 구성된 데이터베이스가 삭제되어도 복구할 수 있다. 그러나 데이터베이스에서 레코드가 삭제된 경우는 파일 복구를 하여도 수정된 레코드 내용이 복원되지 않는다. 이에 삭제된 레코드를 복구하는 기법인 데이터베이스 포렌식이 필요하다. 데이터베이스 포렌식은 데이터베이스 설정 파일로부터 메타데이터를 획득하고, 데이터 파일에서 삭제된 레코드를 복구한다. 그러나 데이터베이스에서 블록 크기와 같은 데이터베이스 메타데이터를 획득하지 못하면 레코드 복구가 어렵다. 본 논문에서는 데이터베이스 메타데이터인 블록 크기를 탐지하기 위한 세 가지 방법을 제안한다. 첫 번째 기법은 블록에 존재하는 빈공간의 최대 크기를 이용하며, 두 번째 기법은 블록이 나타나는 위치를 이용한다. 세 번째 기법은 두 번째 기법보다 더 빠르게 블록 크기를 찾을 수 있도록 개선한다. 실험 결과는 세 가지 탐지 기법 모두 세 종류의 DBMS의 블록 크기를 정확하게 찾을 수 있음을 보인다.

• 한국수산과학회지
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• 제41권1호
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• pp.13-19
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• 2008

Malachite green (MG), a triphenylmethane dye, is carcinogenic, mutagenic, teratogenic, a respiratory toxin, and causes chromosomal fractures. It is not permitted for use as an aquaculture veterinary drug in a number of countries. Sensitive extraction methods for MG and leucomalachite green (LMG), which have long residence times in fish tissues, were developed. For LMG, the average recovery of liquid extraction (LE) ranged from 41.71 (yellowtail) to 71.60% (snakehead); the recovery of liquid-liquid extraction (LLE) was between 67.68 (yellowtail) and 83.68% (snakehead); and the average recovery of solid-phase extraction (SPE) ranged from 84.16 (yellowtail) to 92.92% (shrimp). The recovery of MG was less than 30% with SPE. However, the dye is found primarily as the colorless reduced leuco form in fish tissues.

• 한국식생활문화학회지
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• 제28권1호
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• pp.31-40
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• 2013

The purpose of this study is to analyze external elements of 'time series table serving' and to discover any problems in the table setting. We selected two traditional Korean restaurants in five-star hotels and two representative traditional Korean style restaurants and analyzed the tableware arrangement of their table settings. The results are as follows. In restaurant A, the arrangement of different styles of tableware made from a variety of materials seemed relatively natural. However, the dessert plates were 'Buncheong' ware made with 'Bakji' method; in this case, the pattern was larger than the size of the fruits served and made the food inconspicuous. Rather than using plates made with a 'bakji' method, using plates with small patterns in the 'johwa' method would complement the food. In restaurant B, the space between the tableware, spoon and chopsticks was narrow, and the spoon and chopsticks sets would not fit on the table pads when large dishes or multiple dishes were served. In this case, changing the dishes to smaller sized dishes, considering the size of the table pad, or not using the pad at all would solve the issue. In restaurant C, too many small dishes were laid on the table, making it look disorderly. We believe that recovering tableware that is no longer in use, laying dishes and cutlery inside of the table pads or not using the table pad would be better. In restaurant D, the same style and color of dishes were provided 9 times. The lack of variety could be tedious to customers. The forms and colors of dishes should be changed in accordance with the order of the meal served. However, when using tableware created by different methods such as 'Buncheong' ware or white porcelain, the same pattern should be chosen in order to elevate the dignity of the table menu through uniformity. These issues in tableware arrangement indicate that external forms of banquet table setup should be studied so that the culture of Korean traditional cuisine can be enriched.

• 에너지공학
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• 제26권3호
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• pp.30-50
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• 2017

현재, 석탄이나 석유, 천연가스 등의 화석연료를 대량으로 소비하는 화력발전소나 각종 연료시설로부터 배출되는 배기가스에는 고농도의 $CO_2$가 포함되어 있으며, 지구온난화의 주된 원인으로 되어 있다. 종래, 이 대책법으로서 다방면으로부터 연구개발이 수행되고 있으며, 배기가스 중의 $CO_2$를 분리 회수하여 처분하는 것도 매우 유망한 방법의 하나라고 생각되고 있다. 이산화탄소의 화학적 이용이 적은 이유의 하나는, 이산화탄소가 탄소화합물 중에서도 산화되어 가장 안정한 상태로 존재하기 때문이다. $CO_2$ 배출의 관점에서 앞으로 $CO_2$를 화학적으로 유용한 화합물로 변환시키는 $CO_2$ 고정화 기술이 더욱 중요하다고 생각된다.

• 자원리싸이클링
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• 제23권3호
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• pp.3-12
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• 2014

본 연구에서는 대표적인 폐기물 최종 처리시설인 소각장을 대상으로 소각열 회수에 따른 경제성 분석을 수행하였다. 국내에서 운영 중인 소각장의 건설 및 운영비용, 소각열 회수량에 대한 함수식을 회귀분석을 통해 도출하였으며, 이를 바탕으로 생애주기비용을 비교함으로써 소각열 회수에 대한 경제성을 비교 분석하였다. 도출된 회귀식으로 일일 80톤 처리규모의 소각장을 기준으로 경제성 분석을 진행한 결과, 소각열 회수시 추가 설비 및 인건비로 인한 초기투자 비용 및 운영비용이 크지만, 열회수에 따른 LNG 대체효과로 계산시 11년 이상 운영할 경우 미회수 소각장과 비교하여 경제적 우위성이 있었다. 또한 열 판매와 온실가스 감축효과를 편익으로 계산할 경우 19년의 자본회수기간이 소요됨을 확인하였다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.459-465
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• 2007

This study was conducted to calculate the LCC of a apartment complex with a type of heating system, district heating and cogeneration system. For the purpose of analyzing LCC according to size of apartment complex, 500, 1,500 and 4,000 houses of model apartment selected. This research performs design of heating system and the life cycle cost analysis including an initial cost, energy cost, maintenance and operation cost, replacement cost and renovation cost during the project period(15years). According to the calculated results, 1) Initial cost of cogeneration system with 500, 1500 and 4000 houses is higher than district heating system each of 20%, 13%, 12%. 2) In case of cogeneration system, the payback period by electric generation is 5.21, 4.92 and 4.47 years and saving cost was calculated 29 billion won, 94 billion won and 262 billion won after payback period. 3) Cogeneration system LCC was 1.12, 1.07 and 1.06 times larger than district system with the size of apartment complex. According to the case of this study district heating system is more efficient than cogeneration system in terms of the reduction of LCC. 4) Gas Engine Co-generation System is more efficient than other systems because it can collect progressive part from electric charge progressive stage system. However, the efficiency is decreasing because of raising of fuel bills(LNG) and lowering of power rate for house use. Especially the engine is foreign-made so the cost of maintenance and repair is high and the technical expert is short. 5) District heating is also affected by fuel bills so we should improve energy efficiency through recovering of waste heat(incineration heat, etc.). Also, we should supply district cooling on the pattern of heat using of let the temperature high in winter and low in summer.

• Journal of Forest and Environmental Science
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• 제32권3호
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• pp.302-310
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• 2016

The loss and degradation in tropical forest region are some of the current global concern. Hence, these issues elevated the role of rehabilitated forests in providing ecological products and services. The information on the carbon stock is important in relation to global carbon and biomass use, but lacking from the tropical region. This paper reports the assessment of tree and soil carbon stock in a chronosequence rehabilitated tropical forest stands in Malaysia. The study site was at the UPM-Mitsubishi Forest Rehabilitation Project, UPMKB. $20{\times}20m$ plot was established each and assessed in 2009 at 1-, 10- and 19-year-old sites while an adjacent ${\pm}23-year-old$ natural regenerating secondary forest plot was established for comparison. The overall total carbon stock was in the order of 19-year-old>${\pm}23-year-old$>10-year-old>1-year-old. When forest carbon stock is low, the soil component plays an important role in the carbon storage. The forest carbon recovery is crucial to increase soil carbon stock. The variations in the carbon stock showed the different stages of the forest recovery. Species survived after 19-years of planting are potential species for carbon sequestration activities in rehabilitated forest. Human intervention in rehabilitating degraded forest areas through tree planting initiatives is crucial towards recovering the forest ecological role especially in forest carbon stock capacity.

• 설비공학논문집
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• 제27권10호
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• pp.544-551
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• 2015

This study was conducted to determine the LCC of apartment complexes with district heating and a cogeneration system. For the purpose of analyzing LCC according to the size of the apartment complex, 500, 1,500, and 4,000-unit model apartments were selected. Analysis was performed on the design of the heating system and the life cycle cost including total construction cost, maintenance and operation cost for the duration of the project period (15 years). According to the calculated results, 1) The initial cost of the cogeneration system for 500, 1,500, and 4,000-unit apartments is higher than that of the district heating system by 20%, 13%, and 12%, respectively. 2) In the case of the cogeneration system, the payback period by electric generation was found to be 5.21, 4.92 and 4.47 years, and saving cost was calculated to be 29 billion won, 94 billion won and 262 billion won after the payback period for 500, 1,500, and 4,000-unit apartments, respectively. 3) The LCC values of the cogeneration system were 1.12, 1.07 and 1.06 times larger than those of the district system according to the size of the apartment complex. In this study, the district heating system was found to be more efficient than the cogeneration system in terms of LCC reduction. 4) District heating is affected by fuel bills, so energy efficiency should be improved through recovering waste heat (incineration heat, etc.). Also, district cooling should be provided according to heat use to keep the temperature high in winter and low in summer.