• Vending industry
• /
• v.8 no.3
• /
• pp.36-37
• /
• 2008

미니 커피자판기 시장의 절대 강자 동구전자가 원두커피 분야로도 신화창출을 노리고 있다. 동구전자는 원두커피 시장 확대를 위해 미니 원두커피자판기와 원두커피 서비스기 2모델을 개발 출시하여 업계 관심을 증폭시키고 있다. 오랜 기간 동안 치밀한 제품보완을 거쳐 출시한 두 제품은 '과연 동구 제품이구나'하는 평가를 받을 정도로 시장의 호평을 받고 있다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.11b
• /
• pp.1253-1256
• /
• 2003

유무선의 다양한 환경에서 신뢰할 수 있는 Accounting 을 할 수 있도록 AAA 프로토콜중에 하나인 DIAMETER 의 기능과 특성에 대해서 알아보고 기존의 Accounting 의 문제점을 보완한 Credit-Control 모델에 대해 알아 보도록 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2011.06a
• /
• pp.1435-1436
• /
• 2011

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 1990.04a
• /
• pp.22-31
• /
• 1990

In this paper, we have studied modelling and simulation of computer communication protocols theoretically. After describing a definition and functions of communication protocols, we have classified models for protocol design. And, in those protocol models, by endowing Timed Petri Net (TPN) models with a time function .tau., we have proposed a structural definition of TPN models. Furthermore, in order to complement Petri Net Based models with some problems, we have introduced the Discrete EVent system Specification (DEVS) concept in system simulation field. As an important result of our study, we have presented a theorem, which says that a TPN model becomes a DEVS model, and proved it. According to the theorem, we can perform efficient simulation by using the DEVS model transformed from a TPN model when we intend the TPN model to be simulated, otherwise we design another simulation model for it.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.22 no.5
• /
• pp.381-390
• /
• 2009

In this paper, a complementary analysis for the structural safety evaluation of the spent nuclear fuel disposal canister developed for the Canadian Deuterium and Uranium(CANDU) reactor for about 10,000 years long term deposition at a 500m deep granitic bedrock repository has been performed. However this developed structural model of the spent nuclear fuel disposal canister which has 33 spent nuclear fuel baskets and whose diameter is 122cm is too heavy to handle without any structural safety problem. Hence a lighter structural model of the spent nuclear fuel disposal canister which is easy to handle has been required to develop very much. There are two methods to reduce the weight of the CANDU canister model. The one is to alleviate severe design conditions such as external loads and safety factor. The other is to optimize the cross section shape of the canister by reducing the spent nuclear fuel basket number. Hence, in this paper a complementary analysis to alleviate such severe design conditions is carried out and simultaneously structural analyses to optimize the cross section shape of the canister by reducing the spent nuclear fuel basket number below 33 are carried out by varying the external load and the canister diameter for the reduction of the canister weight. The complementary analysis results show that the diameter of canister can be shortened below 122cm to reduce the weight of the spent nuclear fuel disposal canister.

• Journal of the Korea Institute of Building Construction
• /
• v.18 no.6
• /
• pp.517-525
• /
• 2018

The construction of super tall building which structure is RC and must be certainly considered on column shortening estimation and construction reflected concrete creep has been increased. Regarding the Fck 60~80MPa grade high strength concrete applied in the domestic super tall building project, the mechanical properties and creep deflection according to curing conditions(Drying creep/Basic creep) were reviewed in this research. Results of compressive strength and elastic modulus under sealed curing condition were 5% higher than unsealed condition and difference of results according to the curing condition was increased over time. Autogenous and drying shrinkage tendency showed adversely in the case of high strength concrete. Additionally, creep modulus under unseal curing condition was evaluated 2~3 times higher than sealed condition. Modified model of ACI-209 based on test result was applied to estimate long period shortening of vertical members(such as Core Wall/Mega Column) exactly, it is designed to modify and suggest the optimal creep model based on various data accumulated during construction, in the future.

• Journal of Convergence for Information Technology
• /
• v.9 no.2
• /
• pp.34-42
• /
• 2019

In this study, we analyzed the effects of the automatic control system on the reactor operation. The Propyrene Reactor process is complex and typically is inefficient and costly due to the lack of productivity. In this study, a research model was presented with the aim of supplementing obstacles to enhance operational efficiency and increase productivity. The configuration of the existing processes was analyzed to complement the hardware and software systems with original models. The composition of the facility is applied to eight reactor units producing 600,000 ton/year propylene per year. As a result of applying the research model, efficiency of operation was increased, and production volume increased from 90 to 95%, along with 91% Reliability. Future studies will present a research model to improve productivity by 100 percent. In addition, we will study the stability and productivity improvement of PSA (Pressure Swing Adsorption) systems, which are the hydrogen production process of propylene by-products.

• Journal of the Economic Geographical Society of Korea
• /
• v.20 no.2
• /
• pp.189-213
• /
• 2017

This study seeks to critically examine the significance and limits of the cluster adaptive cycle model for analysis of cluster evolution and to propose research issues for future analysis of cluster evolution based on this critical examination. Until the 1980s, research on industrial complexes including clusters was based on a 'static perspective' that focuses on the aspect of economic space at a specific point in time, but the research paradigm has recently shifted to a 'dynamic perspective' focusing on 'evolution' of 'complex adaptive systems'. As a result, the adaptive cycle model has attracted attention as an analysis tool of dynamically evolving clusters. However, the cluster adaptive cycle model has emerged by being appropriately modified and expanded according to the properties of the cluster and its evolution. The cluster adaptive cycle model is a comprehensive analysis framework that identifies the characteristics of cluster evolution in terms of resource accumulation, interdependence, and resilience and classifies cluster evolution paths into six different categories. Nevertheless, there is still a need for further discussion and supplementation in terms of theoretical and empirical research to expand and deepen the model. Therefore, research issues for future analysis of cluster evolution are to specify and elaborate the cluster evolution model, to emphasize the concept of resilience, and to verify the applicability and usefulness of the model through empirical research.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.10b
• /
• pp.559-561
• /
• 2004

최근 비즈니스 프로세스 통합에 관련된 다양한 연구를 통해, 수많은 비즈니스 프로세스 언어 및 표기법들이 개발되고 있다. 표준화되지 않은 다양한 비즈니스 프로세스 언어들은 비즈니스 프로세스를 자동화하려는 기업들뿐만 아니라, 비즈니스에 참여하는 일반 사용자에게도 혼동을 가져온다. 본 논문은 다양하고 표준화되지 않은 비즈니스 프로세스 언어들을 모두 디자인할 수 있기 위한 적응적인 모델을 제안한다. Jena와 JGraph와 같은 기존 모델의 장점들을 조합하고 단점을 보완하여 개발되었다. 본 논문에서 제안한 모델은 파이프-필터 아키텍쳐를 이용해 비즈니스 프로세스의 데이터를 단계적으로 추출한다. 그리고 추출된 데이터는 다양한 환경에 적응하기 위해, 해쉬 또는 링크드 리스트의 자료 구조에 저장되어 관리된다. 마지막으로, 저장된 데이터들은 사용자의 요구에 따라 실행언어로 변환되거나 다시 GUI에 보여 진다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 2002.05a
• /
• pp.95-99
• /
• 2002

정보검색에서 가장 중요하면서도 어려운 문제 중의 하나는 사용자가 원하는 정보를 찾기위한 효율적인 질의를 작성하는 일이다 순수한 부을 검색 시스템은 문서와 질의 사이의 유사도를 나타내는 문서값을 계산할 수 없기 때문에, 검색된 문서들을 질의를 만족하는 정보에 따라 정렬할 수 없다. 부을 검색 시스템의 이러한 단점을 보완하는 방법으로 P-norm 모델이 개발되었다. 본 논문에서는 높은 검색 효과를 제공하는 지역적 문맥 분석 피드백을 이용한 전보검색 모델을 제안한다. 제안한 지역적 문맥 분석 피드백모델이 적합성 피드백이나 P-norm 모델보다 우수함을 설명하고, 또한 성능 비교를 통하여 이를 입증한다