• 정보처리학회논문지C
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• 제13C권7호
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• pp.843-850
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• 2006

본 논문에서는 기존의 암호화 방법보다 안전한 키를 생성하는 해쉬체인 알고리즘을 제안하며, 해쉬체인 알고리즘 기법을 통해 생성한 각각의 키를 각각의 블록에 적용한 암호화 방법을 사용하여 기존의 시스템보다 보안성이 높은 암호화 방법을 제안한다. 또한 사용자 인증기법을 통해 사용자를 유/무선으로 인증한 후, 키 분할 기법을 이용하여 분할된 키를 안전하게 전송하는 방법과 클라이언트에 키가 유출되어도 완전한 키를 얻지 못하도록 하는 세션키 분할 기법을 제안한다. 제안한 시스템을 설계하고 구현한 후 성능 평가를 위해 다양한 크기의 디지털콘텐츠 파일을 이용하여 실험을 수행하였으며, 제안한 시스템이 기존 시스템에 비해 안전한 키 전송을 할 수 있었고, 키 유출에도 전체 데이터를 복호화 할 수 없도록 암호화 하였다. 또한 클라이언트 시스템에서 비디오 데이터 파일 재생 시 암호화 복호화 시간은 기존 방법과 유사함을 확인하였다.

• Journal of Microbiology and Biotechnology
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• 제29권11호
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• pp.1769-1776
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• 2019

Ethyl (S)-3-hydroxy-3-(2-thienyl) propanoate ((S)-HEES) acts as a key chiral intermediate for the blockbuster antidepressant drug duloxetine, which can be achieved via the stereoselective bioreduction of ethyl 3-oxo-3-(2-thienyl) propanoate (KEES) that contains a 3-oxoacyl structure. The sequences of the short-chain dehydrogenase/reductases from Chryseobacterium sp. CA49 were analyzed, and the putative 3-oxoacyl-acyl-carrier-protein reductase, ChKRED12, was able to stereoselectively catalyze the NADPH-dependent reduction to produce (S)-HEES. The reductase activity of ChKRED12 towards other substrates with 3-oxoacyl structure were confirmed with excellent stereoselectivity (>99% enantiomeric excess) in most cases. When coupled with a cofactor recycling system using glucose dehydrogenase, the ChKRED12 was able to catalyze the complete conversion of 100 g/l KEES within 12 h, yielding the enantiopure product with >99% ee, showing a remarkable potential to produce (S)-HEES.

• 한국컴퓨터정보학회논문지
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• 제14권3호
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• pp.103-111
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• 2009

일반적으로 사용하고 있는 와이브로는 실시간 데이터를 전송하는 기술로 단말이 이동함으로서 기지국 변경으로 인한 빈번한 키 분배, 사용자 인증 및 재 인증 등의 처리과정이 요구되며, 이에 사용하는 보안기술은 빠르게 처리되어야 하는 제한적인 요구를 갖는다. 특히 키 재생성 및 재분배와 같은 키 관리 메커니즘은 와이브로 환경뿐만 아닌 일반적인 이기종 무선 환경에서도 실시간 디지털 콘텐츠 전송서비스에 많은 영향을 주게 된다. 따라서 본 연구에서는 IPTV와 같은 실시간 디지털 콘텐츠 전송을 위해 서버 또는 기지국간의 키와 메시지 교환 처리과정의 부담을 줄여 단말과 기지국간의 효율적인 데이터 전송을 위해 제안하는 OKTEK 키 체인을 통한 트래픽 관리 기법을 제안한다.

• Asian-Australasian Journal of Animal Sciences
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• 제28권2호
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• pp.223-230
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• 2015

This study was conducted to investigate the effects of dietary coconut oil as a medium-chain fatty acid (MCFA) source on performance, carcass composition and serum lipids in male broilers. A total of 540, one-day-old, male Arbor Acres broilers were randomly allotted to 1 of 5 treatments with each treatment being applied to 6 replicates of 18 chicks. The basal diet (i.e., R0) was based on corn and soybean meal and was supplemented with 1.5% soybean oil during the starter phase (d 0 to 21) and 3.0% soybean oil during the grower phase (d 22 to 42). Four experimental diets were formulated by replacing 25%, 50%, 75%, or 100% of the soybean oil with coconut oil (i.e., R25, R50, R75, and R100). Soybean oil and coconut oil were used as sources of long-chain fatty acid and MCFA, respectively. The feeding trial showed that dietary coconut oil had no effect on weight gain, feed intake or feed conversion. On d 42, serum levels of total cholesterol, low-density lipoprotein cholesterol, and low-density lipoprotein/high-density lipoprotein cholesterol were linearly decreased as the coconut oil level increased (p<0.01). Lipoprotein lipase, hepatic lipase, and total lipase activities were linearly increased as the coconut oil level increased (p<0.01). Abdominal fat weight/eviscerated weight (p = 0.05), intermuscular fat width (p<0.01) and subcutaneous fat thickness (p<0.01) showed a significant quadratic relationship, with the lowest value at R75. These results indicated that replacement of 75% of the soybean oil in diets with coconut oil is the optimum level to reduce fat deposition and favorably affect lipid profiles without impairing performance in broilers.

• 한국전자파학회논문지
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• 제20권9호
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• pp.823-828
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• 2009

열쇠 관리용 철재 캐비닛 안에 장착되는 UHF 대역의 열쇠고리형 소형 태그 안테나를 설계 제작하였다. 열쇠 고리형 태그 안테나는 인접한 태그 안테나, 열쇠고리의 금속 부분, 그리고 캐비닛 등과의 상호 간섭 작용을 고려하여 소형으로($66\;mm{\times}6\;mm$) 제작하였다. 제작된 태그 안테나는 T-matching 방법을 사용하여 정합하였고, 미엔더(Meander) 형태를 이용하여 크기를 줄여서 유전체(FR-4) 기판을 사용하여 제작하였다. 먼저 인접한 태그 안테나들과의 상호 간섭을 감안하여 태그 안테나를 설계하였고, 캐비닛의 철재 근처에 장착되는 태그 안테나용으로 또 다른 설계를 제안하였다. 인접한 태그 안테나들의 개수를 변화시켜가며 태그 안테나의 특성과 인식 거리에 미치는 영향을 분석하고 측정하였다. 그 결과 캐비닛에 장착되는 총 360개의 태그 안테나를 모두 인식할 수 있었다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2014년도 추계학술대회
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• pp.72-74
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• 2014

The need to further improve food quality and reduce food waste leads to increased attention for the development of Food Supply Chain Management (FSCM) which considers intrinsic characteristics of food supply chains besides traditional supply chain management (SCM) objectives such as cost and responsiveness. Growing consciousness of society towards sustainable development brings additional objectives to the food supply chains and the fast evolution of sustainable development results in the development of a new fast-growing concept: Sustainable Food Supply Chain Management (SFSCM). In response to these developments, researchers have developed various decision support tools that can be used for handling progressively increasing complexity along the alteration process from SCM to FSCM and now to SFSCM. This study reviewed literature on sustainable food logistics management to identify logistical key issues and relevant challenges. The evaluation of the reviewed papers shows that towards obtaining sustainability together with considering intrinsic characteristics of food supply chains, there is a gap between the needs of the practice and the current available method.

• 한국시뮬레이션학회논문지
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• 제25권3호
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• pp.77-83
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• 2016

본 논문에서는 부분 암호화를 위한 키 생성 및 관리 알고리즘의 연구한다. 제안하는 알고리즘에서는 해쉬 트리 구조를 이용하여 적은 양의 해쉬키로부터 다양한 암호화 키를 생성하는 기능을 제공하고 있다. 본 논문에서는 새로운 키 생성 알고리즘을 이용하여 부분 암호화 및 부분 복호화하는 방법을 제시하고 시뮬레이션을 통하여 그 성능을 분석한다.

• 경영과정보연구
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• 제27권
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• pp.149-172
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• 2008

Since the 9/11 terror attack, the event which caused supply chain disruption, supply chain security has becomes more important than ever before. Furthermore, such company's logistics strategies conflicting supply chain security as increased global sourcing, JIT manufacturing are increasing supply chain vulnerability. It could burden for global companies to strengthen supply chain security because not only it requires additional investment cost but also changes of companiy's global logistics strategy. However, on the other hand, supply chain visibility and resilience can be improved through supply chain security. In addition, it allows companies to stabilize supply chain structure as well as rapid and flexible response to market demand. The key issue is balancing between efficiency and supply chain security. To do this, identifying risk elements under the supply chain and assessing vulnerability of each supply chain components should be performed before developing efficient supply chain security management system without obstructing supply chain efficiency.

• Animal Bioscience
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• 제36권6호
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• pp.829-839
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• 2023

Objective: The aim of this study was to clone the mRNA sequence of the Acyl-CoA dehydrogenase long chain (ACADL) gene of goats and explore the effect of ACADL on the differentiation of subcutaneous fat cells on this basis. Methods: We obtained the ACADL gene of goats by cloning and used quantitative real-time polymerase chain reaction (qPCR) to detect the ACADL expression patterns of different goat tissues and subcutaneous fat cells at different lipid induction stages. In addition, we transfect intramuscular and subcutaneous adipocytes separately by constructing overexpressed ACADL vectors and synthesizing Si-ACADL; finally, we observed the changes in oil red stained cell levels under the microscope, and qPCR detected changes in mRNA levels. Results: The results showed goat ACADL gene expressed in sebum fat. During adipocyte differentiation, ACADL gradually increased from 0 to 24 h of culture, and decreased. Overexpression of ACADL promoted differentiation of subcutaneous adipocytes in goat and inhibited their differentiation after interference. Conclusion: So, we infer ACADL may have an important role in positive regulating the differentiation process in goat subcutaneous adipocytes. This study will provide basic data for further study of the role of ACADL in goat subcutaneous adipocyte differentiation and lays the foundation for final elucidating of its molecular mechanisms in regulating subcutaneous fat deposition in goats.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권9호
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• pp.3751-3770
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• 2015

Many sorts of image processing software facilitate image editing and also generate a great number of doctored images. Forensic technology emerges to detect the unintentional or malicious image operations. Most of forensic methods focus on the detection of single operations. However, a series of operations may be used to sequentially manipulate an image, which makes the operation detection problem complex. Forensic investigators always want to know as much exhaustive information about a suspicious image's entire processing history as possible. The detection of the operation chain, consisting of a series of operations, is a significant and challenging problem in the research field of forensics. In this paper, based on the histogram distribution uniformity of a manipulated image, we propose an operation chain detection scheme to identify histogram equalization (HE) followed by the dither-like operation (DLO). Two histogram features and a local spatial feature are utilized to further determine which DLO may have been applied. Both theoretical analysis and experimental results verify the effectiveness of our proposed scheme for both global and local scenarios.