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이구연,최광석,김태우,조관형,강동진,김성태,장동진 한국산업식품공학회 2017 산업 식품공학 Vol.20 No.2
The purpose of this study was to optimize dough properties using response surface methodology (RSM) and to demonstrate the performances of dough prepared under optimized conditions. Dough mixed with yeast, margarine, salt, sugar and wheat flour was prepared by fermentation process. Hardness, cohesiveness and springiness of dough were selected as critical quality attributes. The critical formulations (yeast and water) and process (fermentation time) variables were selected as critical input variables based on preliminary experiment. Box-Behnken design (BBD) was used as RSM. As a result, the quardratic, the squared and the linear model respectively provided the most appropriate fit (R2>90) and had no significant lack of fit (p>0.05) on critical quality attributes (hardness, cohesiveness and springiness). The accurate prediction of dough characteristics was possible from the selected models. It was confirmed by validation that a good correlation was obtained between the actual and predicted values. In conclusion, the methodologies using RSM in this study might be applicable to the optimization of fermented foods containing various wheat flour and yeast.
ISDN 환경에서의 다중 ON-OFF source 에 대한 AO/DI기능의 성능분석
이구연 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-
ISDN provides mB+D channel to users. AO/DI scheme means D-channel can be used for a permanent low speed connection. When user needs more bandwidth for high speed transfer, AO/DI scheme automatically instigate greater capacity in the shape of ISDN B-channels. In this paper, we analyze the performance of AO/DI scheme with multiple ON-OFF sources in ISDN. We consider multiple ON-OFF sources connected through mB+D ISDN link. Without AO/DI scheme, the required bandwidth will be the sum of peak bandwidth of all sources. With the implementation of AO/DI scheme, the required bandwidth is reduced to what is really needed. For the comparison of performance improvement of AO/DI scheme, we define performance measure in this paper. Numerical results in the form of performance measure are given and some observations are made.
이구연 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
In this paper, we focus on a question. Which is better between time-based location update method and movement-based location update method? Or. does any other method combining the two methods show better performance? For the question, we propose a hybrid location update scheme, which integrates the time-based and the movement-based methods. In the proposed scheme, a mobile terminal updates its location after n cell boundary crossing and a time interval of T, or the inverse. We derive an analytical solution for the performance of the hybrid scheme with exponential cell resident time. From the numerical analysis, we conclude that the movement-based method seems to have better performance than the time-based and hybrid methods, that is the optimal costs occur at T=O.
다중 상태 기반의 이동성에 대한 혼합형 위치 갱신 방법의 성능분석
이구연 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.A
In this paper, we define the multi-states exponential cell resident time mobility model for describing the mobility characteristics of mobile user and analyzed the total cost of the hybrid method using multi-states cell resident time. Generally, the mobile user has three states for its movement, such as staying, walking and driving. This multi-states cell resident time based hybrid method reflects the movement characteristics of mobile user and adapts the location update period according to the states of mobility speed. As a results of the performance analysis, we can get the optimum parameters of the hybrid method for multi-states based mobile users.
이동통신망에서의 향상된 시간 기반 위치 갱신 방법의 성능 분석
이구연,이용 대한전자공학회 2004 電子工學會論文誌-TC (Telecommunications) Vol.41 No.11
In this paper, an enhanced time-based registration method is proposed. The method reduces the registration cost when a mobile terminal stays in a cell for a long time. We also analyze the performance of the proposed method numerically. In the analysis, we assume Poisson call arrival distribution and exponential cell resident time. From the analysis we calculate the optimal time-interval. Additionally, limit cost analysis is made to investigate the behaviors in the limit conditions. To compare the performance of the proposed method with the original time-based registration method, we analyze the performance of the original time-based registration method. In the comparisons, we see that the proposed enhanced time-based registration method has better performance and is applicable to the PCS systems. 본 논문에서는 이동 통신망에서의 향상된 시간 기반의 위치 갱신 방법을 제안하고 제안된 방법의 성능을 분석하였다. 분석에서는 포아송 분포의 호 도착시간을 가정하였고, 지수분포의 셀 체류시간을 가정하였으며 분석결과로서는 제안된 방법에서의 최적의 갱신주기를 구하였다. 부가적으로 갱신주기의 값의 변화에 따른 비용의 특성을 관찰하고자 갱신주기의 값이 0 또는 무한대로 근접할 경우에 대하여 위치관리 비용을 분석하였다. 제안된 위치갱신방법과 기존에 제안된 오리지날 시간 기반의 위치갱신방법과의 비교를 위하여 오리지날 시간 기반의 위치갱신 방법에 대한 분석도 수행하였다. 두 방법에 대한 비교에서 제안된 방법이 주어진 환경에서 성능이 향상됨을 알 수 있었다.
그룹키를 이용한 보안 멀티캐스트 시스템에서 최소 비용을 위한 Rekey Interval 할당에 관한 연구
이구연,이용,Lee, Goo-Yeon,Lee, Yong 대한전자공학회 2003 電子工學會論文誌-TC (Telecommunications) Vol.40 No.1
본 논문에서는 그룹키를 이용하는 보안 멀티캐스트 환경에서 그룹키 노출로 인한 정보손실과 그룹키 재분배의 과정에 대하여 연관지어 설명한다. 또한 손실된 정보에 대한 비용과 키 갱신에 소요되는 비용의 과제를 결합하여 최소의 비용을 갖는 최적의 rekey interval을 분석한다. 본 분석의 결과를 이용하면 그룹키 재분배에 있어서 비용적인 면을 효율성의 척도로 하여, 회원수, 회원의 보안 능력 및 탈퇴율등을 반영하여 rekey interval을 구함으로서 최소비용으로 그룹을 관리할 수 있다. 이러한 효율적인 rekey interval 할당에 대한 연구는 지금까지 크게 중요시되지 않던 부분이었으나 rekey interval 할당에 대한 문제를 현재보다 개선하고 보완한다면, 보안 멀티캐스트 그룹의 활강성과 활용성을 증가시킬 수 있을 것이다. In this paper, we investigate a rekey mechanism for a secure multicast group communications and relate the mechanism to the loss of information from group key exposal. We also combine cost for the information loss and cost for group key updates and analyze the optimum rekey interval. Using the results of the analysis in this paper, we can manage a secure multicast group efficiently with the minimal cost on the bases of number of group members, each member's security level and withdrawal rates.