밤시럽사용으로 원가를 절감한다-시럽 및 충전물의 밤 시럽 대체법

이석원,Lee, Seok-Won 대한제과협회 1996 베이커리 Vol.6 No.-

터널 설계 및 시공기술의 발전

이석원,박의섭,김동규,Lee, Seok-Won,Park, Ui-Seop,Kim, Dong-Gyu 한국터널지하공간학회 2008 자연, 터널 그리고 지하공간 Vol.10 No.2

시간지연 시스템의 응답특성 개선을 위한 제어기 설계

이석원,양승현,Lee, Suk-Won,Yang, Seung-Hyun 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.7

시간지연이 존재하는 시스템의 제어기 설계에 많이 사용되는 Smith Predictor는 플랜트와 모델이 완전히 일치해야만 특성방정식에서 시간지연을 제거 할 수 있기 때문에 실제 공정에서는 적용하기가 매우 어렵다. 본 논문에서는 Smith Predictor의 모델을 플랜트와 일치한 식이 아닌 시간지연을 포함한 2차식 형태로 제안하여 큰 시간지연에서의 응답특성을 향상 시켰다. PI 제어기의 적분상수의 범위를 제안하였다. The practical control problems for the lime-delay system is considered. The delay-free characteristics of the Smith Predictor is available only when both the process and it's model are exactly matched. So it does not used widely in practical industrial processes. In this paper, using the 2nd-order plus dead time model in place of the plant model of the Smith Predictor, the proposed controller shows the improved performance in case of the very long time delay. And the range of integral constant of the PI controller is also proposed.

국산 꽃차에 대한 미국과 일본의 소비자인식 및 지불의사에 대한 연구

이석원,양성범,Lee, Seog-Won,Yang, Sung-Bum 한국식품영양학회 2014 韓國食品營養學會誌 Vol.27 No.3

The objective of this study is to propose an export strategy due to an analysis of USA and Japan consumer's perception and willingness-to-pay for flower tea. For that, we conducted a survey on the consumer's perception on flower tea compared with leaf tea such as green tea. We also analyzed the willingness to purchase and pay for it. The reasons of drinking of flower tea for USA consumer are 'flavor'-followed by 'taste', and for Japanese consumer 'relaxation'-followed by 'flavor' in order. Both of them consider 'quality', 'safety'- and 'origin' in order when they purchase flower tea. USA consumers have a willingness-to-pay of about 8.3% and Japanese consumers have a willingness-to-pay of about 29.1%. Based on those results, it is necessary to differentiate the process and marketing strategies for the export of flower tea.

IVF-ET Program에서 Blastocyst 배아의 발생에 관한 연구 - II. 난구세포 공동배양에 의한 Blastocyst 배아의 발생

이석원,윤산현,윤혜균,조현진,허용수,윤혜진,박세필,이원돈,임진호,Lee, Suk-Won,Yoon, San-Hyun,Yoon, Hye-Gyun,Cho, Hyon-Jin,Heo, Yong-Soo,Yoon, Hye-Jin,Park, Se-Pill,Lee, Won-Don,Lim, Jin-Ho 대한생식의학회 1998 Clinical and Experimental Reproductive Medicine Vol.25 No.1

This study was carried out to investigate the development rates of human embryos co-cultured with cumulus cells to each blastocyst stage. Human zygotes were co-cultured on cumulus cell monolayer in YS medium supplemented with 20% hFF. On day 2, if patient had four or more "good" embryos (regular blastomeres without fragmentation), embryos were further cultured for 72hrs. Blastocysts on day 5 were classified into early blastocyst (ErB), early expanding blastocyst (EEB), middle expanding Blastocyst (MEB), and expanded blastocyst (EdB) on the basis of their morphological aspects of trophectoderm cells and blastocoele. Subsequently, maximum 3 of best blastocysts were transferred in 486 cycles. The results in this study were as follows: Patients who had four or more "good" embryos on day 2 were 498 persons, but patients whose embryos could not be transferred due to failure in development to the blastocyst stage on day 5 were 12 persons (2.4%). The development rate of embryos to the blastocyst stage was 58.2% (2,885/4,957) on day 5, and the rates that developed to the ErB, EEB, MEB, and EdB stage were 15.0% (743/4,957), 14.9% (739/4,957), 14.4% (714/ 4,957), and 13.9% (689/4,957), respectively. Total 1366 blastocysts were transferred in 486 cycles (mean number=2.81). The implantation rate and the ongoing implantation rate obtained by observing the number of G-sac and FHB were 29.9% (409/1,366) and 22.5% (308/1,366), respectively. The clinical pregnancy rate was 51.2% (249/486), and the ongoing pregnancy rate' was 39.1% (190/486). Among women showing ongoing pregnancy, women with singleton were 50% (95/190), women with twin were 37.9% (72/190), and women with triplet were 12.1% (23/190). Although triplet pregnancy rate in this study was high such as 12.1%, because many blastocysts with high viability were produced in our co-culture system using cumulus cells on day 5, we really believe that a multiple pregnancy except twin should not occur by selecting good embryos for maximum two blastocyst transfer. These results demonstrate that autologous cumulus cells may be used for the production of blastocysts with high developmental competence, and the use of autologous cumulus cells to be collected easily, and to be treated conveniently at OPU must be an effective means for obtaining high implantation and pregnancy rate.

수치해석 기법을 이용한 복개 터널구조물의 거동에 관한 연구

이석원,이규필,배규진,Lee, Seok-Won,Lee, Gyu-Phil,Bae, Gyu-Jin 한국터널지하공간학회 2003 터널기술 Vol.5 No.1

In the deign of cut and cover tunnel, the structural analysis such as rigid frame analysis has been used for its simplicity and convenience. The structural analysis, however, can not consider the geological and geotechnical factors such as soil arching effect. In this study, the dominant factors influencing the behavior of cut and cover tunnel such as interface element, slope of excavation plane, distance between slope and tunnel lining, and location of slope of covered soil, were investigated by the numerical analysis to develop the analysis technique and design technology. Based on the results, the variation of bending moment, shear stress, axial force and displacements were evaluated and analyzed for each factor. 현재 복개 터널구조물의 해석 및 설계에는 구조공학적 모델링 기법이 널리 적용되고 있으나, 이러한 구조공학적 모델링 기법은 지형적인 영향인자 및 soil arching 등과 같은 지반공학적 측면의 영향인자를 고려하기에 많은 어려움이 있다. 따라서, 본 연구에서는 복개 터널구조물의 합리적이고 경제적인 설계를 위하여 복개 터널구조물의 거동에 영향을 미치는 인자로써 콘크리트 라이닝과 성토체의 계면요소, 굴착사면의 경사, 이격거리 및 성토사면 등을 고려하여 지반공학적 모델링 기법을 이용한 수치해석 수행하였다. 이의 결과를 토대로 각 영향인자 변화에 따른 복개 터널구조물의 역학적 거동특성을 분석하였다.

동적인 채널할당을 이용한 결합형 주문형 비디오 서비스

이석원,박승권,Lee Suk Won,Park Sung-Kwon 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.1a

주문형 비디오 시스템의 설계에 있어 가장 중요하게 고려되고 있는 것은 사용되는 채널의 수를 일정하게 유지하면서 자입자의 대기시간을 줄이는 방법이다. 이러한 연구의 한 시도로 근래에 실시간 주문형 비디오와 유사주문형 비디오의 장점을 결합하는 결합형 주문형 비디오에 대한 연구가 활발히 이루어지고 있다. 결합형 주문형 비디오에 대한 연구는 결국 어떻게 유니캐스트 채널을 사용하는 사용자들을 그룹화하여 멀티캐스트 채널을 사용하도록 할 것인가에 대한 연구이다. 본 논문에서는 동적인 채널을 이용하여 시청자의 대기시간을 기존의 방식에 비해 효율적으로 줄일 수 있는 결합형 주문형 비디오를 제안하겠다. 모의실험 결과 제안된 방식은 10개의 비디오를 100의 채널을 이용하여 0.5 requests/second의 도착률로 서비스할 경우 Unified Video-on-Demand 비해 $551{\%}$의 성능향상을 보였다. 본 논문은 동적채널 할당을 이용하여 채널을 해제하고 다시 사용하는 과정, 성능 모델, 모의실험을 제시한다. In designing a video-on-demand (VoD) system, the major challenge may be how to reduce the channels concurrently used maintaining the client's waiting time. For this reason, the various architectures which integrate the multicast streams with the unicast streams were suggested in order to improve channel efficiency in recent years. In combining multicast with unicast, the ways to group the unicast channels together are important so that clients can share the multicast transmission channels. This paper proposes a hybrid video-on-demand system which gathers the unicast channels in new ways and shares multicast transmission channels efficiently by using dynamic channel allocation architecture. The numerical results demonstrate that the proposed architecture in some case achieves performance gain of $551{\%}$ compared to existing architecture. This paper presents procedure of channel release and reuse, performance analysis, and simulation results of the dynamic channel allocation architecture.

두유 신제품 개발을 위한 소비자 구매행태 및 지불의사에 대한 연구 - 천안지역 생협 소비자를 중심으로 -

이석원,양성범,Lee, Seog-Won,Yang, Sung-Bum 한국식품영양학회 2016 韓國食品營養學會誌 Vol.29 No.5

The objective of this study was to propose motivation for the analysis of consumer's purchasing behavior and willingness to pay for the new soymilk products in cooperative stores. We surveyed the purchasing behavior, willingness to purchase, willingness to pay, and impact factors on willingness to pay. The results indicated that most consumers drank soymilk more than once per week. The reasons for consuming soymilk were health, nutrition, and taste, in order. When purchasing soymilk, consumers considered environment-friendly, quality, country of origin, brand, and price, consecutively. Taste was also an essential quality factor. Thus, consumers showed some willingness to purchase new soymilk products. In addition, cooperative members considered environmental characteristics of raw material and improvement of preference for final product as more important than functionality or food additives. Differentiation of process and marketing strategies are required for the development of soymilk products for cooperative members.

선진국 방폐장 - 최적의 자연 환경과 국민 의식

이석원,Lee, Seok-Won 한국원자력산업회의 2005 원자력산업 Vol.25 No.12

"우리 세대의 문제, 다음 세대로 넘기지 말아야" - 스웨덴 포르스마르크 방폐장

이석원,최한성,Lee, Seok-Won,Choe, Han-Seong 한국원자력산업회의 2005 원자력산업 Vol.25 No.12