• Nutrition Research and Practice
• /
• 제1권4호
• /
• pp.260-265
• /
• 2007

Preservation methods on the physiological and brewing technical characters in bottom and top brewing yeast strains were investigated. The preserved yeasts were reactivated after 24 months storage and grown up to stationary phase. The samples of filter paper storage indicated a higher cell growth and viability during propagation than those of nitrogen and lyophilization storage independent on propagation temperature. In addition, the filter paper storage demonstrated a faster absorption of free amino nitrogen and a highest level of higher aliphatic alcohols production during propagation than other preservation methods, which can be attributed to intensive cell growth during propagation. Moreover, the filter paper storage showed a faster accumulation for glycogen and trehalose during propagation, whereas, in particular, lyophilization storage noted a longer adaptation time regarding synthesis of glycogen and trehalose with delayed cell growth. In beer analysis, the filter paper storage formed an increased higher aliphatic alcohols than control. In conclusion, the preservation of filter paper affected positively on yeast growth, viability and beer quality independent on propagation temperature. In addition, in this study, it was obtained that the HICF and Helm-test can be involved as rapid methods for determination of flocculation capacity.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2011년도 춘계학술대회
• /
• pp.119-122
• /
• 2011

최근 활발히 연구되고 있는 스테레오 비전의 BP 알고리즘은 시차 정보 추출에 우수한 성능을 보인다. 본 논문에서는 Belief Propagation(BP) 알고리즘과 영역 기반 정합 알고리즘을 이용하여 스테레오 이미지로부터 시차 지도를 추출하고, 두 알고리즘을 Middlebury 웹사이트에서 제공하는 2쌍의 스테레오 이미지를 사용하여 비교함으로써, BP 알고리즘을 사용한 정합 알고리즘의 정확성이 높음을 이론적으로 증명한다. 실험 결과 시차 지도의 오류율은 52.3%에서 2.3%로 감소하였다.

• 한국통신학회논문지
• /
• 제37권3B호
• /
• pp.212-218
• /
• 2012

인터넷 웜은 컴퓨터 네트워크를 이용하여 자기 자신을 자동으로 복제해서 전파하는 프로그램이다. 컴퓨터간의 네트워크 연결이 증가함에 따라 인터넷 웜은 급격해 확산되었고 큰 위협으로 남아있다. 코드 레드, 님다, 슬레머 같은 인터넷 웜의 특성과 이들의 활동을 억제하는 방법을 찾기 위해서 웜이 전파되는 특성을 연구하려는 많은 시도가 있었다. 네트워크 특징들이 인터넷 웜 전파에 미치는 영향은 모델의 간단성과 유사성 때문에 주로 의학계에서 사용되는 전염병 전파 모델을 이용하여 모델링이 되었다. 이런 의학계 모델링은 널리 사용되면서 여러 개선된 모델들이 다양하게 제안되었다. 우리는 이전의 제안된 모델들의 문제점을 분석한 후 통계적 방법을 사용하여 정확도를 높이는 새로운 방법의 웜 전파 모델링을 제안한다.

• 한국인터넷방송통신학회논문지
• /
• 제15권6호
• /
• pp.201-208
• /
• 2015

3차원 입체 방송을 가능하게 하기 위해서는 실세계에 존재하는 한 사물에 대한 깊이 정보를 획득하여야 한다. 따라서 본 논문에서는 네트워크 알고리즘인 신뢰확산(belief propagation) 알고리즘을 다해상도 영역에서 적용하여 3차원 정보의 근간이 되는 변이(disparity) 영상이나 깊이(depth)영상을 정확하면서도 빠르게 생성하는 것을 목적으로 한다. 신뢰확산 알고리즘은 기본적으로 여러 번의 반복을 통하여 변이정보를 보다 정확하게 갱신하게 되어 많은 연산량과 넓은 탐색영역으로 인하여 성능의 수렴까지 오랜 시간이 걸린다. 다해상도 변환은 공간영역과 주파수영역 모두에서 우수한 해상도를 갖기 때문에 이를 이용하여 스테레오 정합의 연산 속도를 증가시키고 성능을 향상시키는 것을 보여주었다.

• Food Science and Biotechnology
• /
• 제17권4호
• /
• pp.739-744
• /
• 2008

The method of yeast propagation has an influence on yeast physiology, fermentation ability, flocculation rate, and taste stability of beer. In order to find optimal conditions for propagation, several parameters were investigated in combinations. The bottom brewing yeast grown at $10^{\circ}C$ indicated that a higher flocculation capacity during the $1^{st}$ fermentation. However, the taste stability and the aroma profile were not affected by parameters of propagation investigated. The beer quality was rather affected by storage duration. In addition, a correlation between tasting and chemiluminescence was found at the beer, which was produced using bottom brewing yeast. The propagation at $10-25^{\circ}C$ with addition of zinc ion indicated the best condition to improve fermentation ability, flocculation rate, and filterability for bottom brewing yeast, whereas the propagation at $30^{\circ}C$ with addition of zinc ion showed the best condition to increase fermentation ability for top brewing yeasts.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2019년도 춘계학술발표대회
• /
• pp.273-276
• /
• 2019

There is a lot of information in our world, quick access to the most accurate information or finding the information we need is more difficult and complicated. The recommendation system has become important for users to quickly find the product according to user's preference. A social recommendation system using community detection based on label propagation is proposed. In this paper, we applied community detection based on label propagation and collaborative filtering in the movie recommendation system. We implement with MovieLens dataset, the users will be clustering to the community by using label propagation algorithm, Our proposed algorithm will be recommended movie with finding the most similar community to the new user according to the personal propensity of users. Mean Absolute Error (MAE) is used to shown efficient of our proposed method.

• 정보보호학회논문지
• /
• 제20권3호
• /
• pp.135-140
• /
• 2010

중국인의 나머지 정리(Chinese Remainder Theorem)를 이용한 RSA 암호 시스템(RSA-CRT)에서의 연산은 기존의 일반 RSA 멱승 연산보다 빠르게 처리할 수 있어 디지털 서명이나 복호 과정에서 많이 사용된다. 그러나 RSA-CRT는 오류주입 공격에 매우 취약한 특성을 보여 많은 대응책이 제안되고 있다. 이 중에서 Yen 등은 오류 확산 기법을 사용한 두 가지 대응책을 제안하였는데 FDTC 2006에서는 그에 대한 새로운 공격 방법이 제시되었다. 그러나 Kim 등은 비트 연산 중 AND 연산의 특성을 이용하여 FDTC 2006에서 제시한 공격을 방어하는 방법을 제안하였다. 본 논문에서는 Kim 등이 제안한 AND 연산을 이용한 오류 확산 기법이 선택 메시지에 대한 오류주입 공격에 취약하여 안전하지 않음을 밝히고자 한다.

• 전자공학회논문지A
• /
• 제31A권9호
• /
• pp.53-63
• /
• 1994

In indoor radio systems, vehicular communication systems, and land mobile systems, a very important problem is that of maintaining stable communications at all locations. Therefore solutions for the indoor propagation problem are important aspects of the mobile communication system. leaky coxial cables are finding increasing use in communications systesm involving mines, tunnels, tailroads, and highways, and in new obstacle detection, or guided radar, schemes for ground transportation and perimenter surveilance. In this paper a leaky coaxial cable having periodic slots in the outer conductor is described to obtain the propagation modes in the various environments. We use aneccentric cylindrical model to develop the theory for surface-wave propagation on the cable. Numerical Results are also included for the propagation constants, field distribution and current distribution. First, we derive the electromagnetic equation for leaky coaxial cable having symmetrical periodic slots using mode-matching method and Floquet's theorem, and then find various modes, propagation constants, field distribution, etc.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제3권1호
• /
• pp.96-107
• /
• 2009

Worm attacks can greatly distort network performance, and countering infections can exact a heavy toll on economic and technical resources. Worm modeling helps us to better understand the spread and propagation of worms through a network, and combining effective types of mitigation techniques helps prevent and mitigate the effects of worm attacks. In this paper, we propose a mathematical model which combines both dynamic quarantine and passive benign worms. This Passive Worm Dynamic Quarantine (PWDQ) model departs from previous models in that infected hosts will be recovered either by passive benign worms or quarantine measure. Computer simulation shows that the performance of our proposed model is significantly better than existing models, in terms of decreasing the number of infectious hosts and reducing the worm propagation speed.

• 한국정보기술응용학회:학술대회논문집
• /
• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
• /
• pp.99-102
• /
• 2005

In the paper, a proposed VCO based on bondwire inductances and nMOS varactors was implemented in a standard $0.25\;{\mu}m$ CMOS process. Using the new drain current model and a propagation delay time model equations, the operation speed of CMOS gate will predict the dependence on the load capacitance and the depth of oxide, threshold voltage, the supply voltage, the channel length. This paper describes the result of simulation which calculated a gate propagation delay time by using new drain current model and a propagation delay time model. At the result, When the reverse bias voltage on the substrate changes from 0 voltage to 3 voltage, the propagation delay time is appeared the delay from 0.8 nsec to 1 nsec. When the reverse voltage is biased on the substrate, for reducing the speed delay time, a supply voltage has to reduce. The $g_m$ value of MOSFET is calculated by using new drain current model.