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PKI환경에서 ECC를 이용한 안전한 메신저 설계 및 구현
박수영,정채영 朝鮮大學校 統計硏究所 2006 統計硏究所論文誌 Vol.8 No.1
컴퓨터와 네트워크의 보급이 일반화되면서 인터넷을 통한 정보 전달이 일상생활처럼 되고 있다. 기존에는 정보를 전달하기 위한 방법이 주로 전자메일에 한정되어 있던 것에 반해, 요즘은 좀 더 즉각적으로 메시지를 전달해주는 메신저를 많이 사용하고 있다. 현재 사용되고 있는 대부분의 메신저는 자료의 효과적인 관리를 위한 통신의 주체가 되는 각각의 에이젼트들간의 통신과 서버와 에이젼트의 통신에 있어 악의적인 침입에 의한 정보누출이 문제가 되고 있다. 본 논문에서는 메신저의 안전한 통신을 위해 PKI를 이용한 EIGamal 방식의 ECC 이용하여 최대한 안전성이 확보될 수 있고 사용자 그룹 단위의 암호화를 위해 그룹별로 타원곡선과 그 위에 있는 임의의 점을 선택하여 다른 그룹과 구별할 수 있는 안전한 메신저 시스템을 설계 구현하였다.
金泰圭,鄭鳳守,黃光性,金明奎,鄭泰相,愼英喆 진주산업대학교 농업기술연구소 1991 農業技術硏究所報 Vol.4 No.-
The purpose of this study is to figure out the engine performance of corn oil as a diesel engine fuels. corn oil-diesel fuel mixtures in 3 type proportions were tested in a single cylinder diesel test engine. The automatic and successive data for engine performance obtained by microcomputer-measuring system. The results of experiment summarized as follows 1. The viscosity reduction ratio of corn oil was approximately 80% when the temperature raised from 10℃ to 60℃. 2. The maximum torque and maximum power out were decreased with increasing of the amount of corn oil in the mixture, it was considered of the lower specific heat value of corn oil comparative to diesel fuel. 3. In view of fuel consumption and thermal efficiency tested engine with corn oil-diesel fuel blends showed better performance at heavy loads and at high speeds.
알러지성 비염 환자 107례에 대한 神鼻煎의 임상적 효과
김경렬,장현호,두인선,김남권,이종화,유영수,강형원 한국전통의학연구소 2002 한국전통의학지 Vol.12 No.1
Allergic rhinitis is characterized by rhinorrhea, sneezing and nasal obstruction. Allergic rhinitis increases because of developments of diagnostic techniqhe, environmental change, especially industrialization. Recently people have studied on allergic rhinitis. We studied 107 allergic rhinitis patients with SBJ from June. 2002 to December, 2002. There was a significant effect of SBJ on allergic rhinitis. So, we suggested the clinical effect of SBJ on allergic rhinitis.
Enzymatic Lactulose Production from Lactose Using Cellobiose 2-Epimerase
Yeoung-Su Kim 한국당과학회 2016 한국당과학회 학술대회 Vol.2016 No.01
Lactulose (4-o-β-D-galactopyranosyl-D-fructose) is a non digestible disaccharide that is used medicinally as a treatment for portal systemic encephalopathy, chronic constipation, and hyperammonemia. In the food industry, the bifidus factor lactulose can be used as an ingredient that has greater sweetness and solubility than lactose. The biological synthesis of lactulose has been studied with β-galactosidases using lactose and fructose as substrate and co-substrate, which exhibits a low conversion yield. In this study, the enzymatic production of lactulose was attempted without the addition of fructose using a thermostable recombinant cellobiose 2-epimerase from Caldicellulosiruptor saccharolyticus as a new type of lactulose-producing enzyme. The conditions for maximum lactulose production from lactose, as a single substrate, by cellobiose-2-epimerase from C. saccharolyticus were determined to be pH 7.5, 80 C, 700 g/L lactose, and 150 U/mL of enzyme. Under the conditions, the enzyme produced the two bifidus factors lactulose at 408 g/L and epilactose at 107 g/L after 2 h. The yields of lactulose and epilactose from lactose and the productivities of lactulose and epilactose were 58%, 15%, 204 g/L/h, and 54 g/L/h, respectively. This is the first trial of enzymatic synthesis of lactulose using the single substrate lactose. These results will contribute to the industrial production of lactulose from lactose via an enzymatic process.
Su Yeoung Kim,Hye Ryun An,Pil Man Park,Yun Su Baek,Oh Keun Kwon,So-Young Park,Pue Hee Park 한국화훼학회 2016 화훼연구 Vol.24 No.3
The present study investigated the floral scent pattern and intensity of the floral organs in various species and cultivars of Maxillaria at different flowering stages using an electronic nose with 6 metal oxide sensors. The scents of species and cultivars showed various patterns overall, especially that of M. tenuifolia. The scent patterns of cultivars derived from M. variabillis formed a clustere that differed greatly from the origin M. variabillis. In M. tenuifolia, the scent pattern differed by stage, and was strongest at the initial flowering stage. Each floral organ showed different scent patterns; the sepal emitted the strong scent of all floral organs. This study establishes baseline data for the analysis scent of Maxillaria scents and for breeding aromatic orchids.