• 유체기계공업학회:학술대회논문집
• /
• 2005.12a
• /
• pp.373-377
• /
• 2005

The Performance of in-line duct fan depends on the design parameters of impeller and guide vane. such as sweep back angle of impeller, the number of blades, outlet blade angle, guide vane angle etc. In this experimental study total four kinds of impellers having different sweep back angles, $90^{\circ},\;72.5^{\circ},\;55^{\circ},\;37.5^{\circ}$ with 8 guide vanes, different the number of blades, 6ea, 8ea, 10ea, 12ea, different kinds of outlet blade angles, $30^{\circ},\;45^{\circ}.\;60^{\circ}$ and different kinds of guide vane angles, $15^{\circ},\;30^{\circ},\;45^{\circ}$ were selected and their performance measured to investigate the effects of them. The results were non-dimensionalized to compare their performance.

• Journal of Dairy Science and Biotechnology
• /
• v.36 no.2
• /
• pp.121-124
• /
• 2018

Ellagic acid (EA) is a naturally occurring polyphenolic compound in vegetables, nuts, and fruits such as berries. EA has antioxidant, anticancer, anti-allergy, and anti-inflammatory activities. The objectives of this research were to investigate the physicochemical properties of nanoparticles before and after nano-encapsulation of EA in dairy protein and to develop a functional (anti-inflammatory) dairy protein-based beverage containing EA. A particle size analyzer was used to determine the physicochemical and morphological properties. High performance liquid chromatography was used to evaluate the entrapment efficiency of EA. The nanoparticles containing EA were 100 to 200 nm in diameter. The determined poly dispersity index value of 0.3 to 0.4 indicated that the nanoparticles were uniformly distributed with similar size. Zeta-potential values were also similar between the control groups. The entrapment efficiency of EA was nearly 90%. The results indicate the potential for development of nanoparticles containing EA beverage products with anti-inflammatory activity.

• Journal of Information Technology and Architecture
• /
• v.10 no.4
• /
• pp.435-449
• /
• 2013

The performance of Enterprise Architecture (EA) in the Korea's public IT domain produces mixed results and responses. On the one hand, EA earns positive remarks and enthusiasm as a central government-wide IT governance framework with its significant IT budget saving records. At the same time, however, the response to EA at the department and agency level is tainted with disappointment, fatigue, and reluctance. This essay suggests that this is perhaps caused by the sterile lackluster concept of EA Business Architecture employed in the current EA practice of the enterprise. The possibility for liberating and reviving the concept of EA Business Architecture is explored. Various conceptual axes and branches of EA Business Architecture are identified based upon extensive EA field experience and observations, and discussions are made on how the concept of EA Business Architecture can be expanded and amplified on those conceptual axes and branched. The resulting EA Business Architecture conceptualization is consolidated into an illustrative typology for EA Business Architecture. In the end the theoretical and practical implications of the research are discussed along with its contribution and limitation.

• 제어로봇시스템학회:학술대회논문집
• /
• 2000.10a
• /
• pp.217-217
• /
• 2000

A decentralized robust EA(eigensoucture assignment) controller is designed for an active suspension system of a vehicle based on a full car model with 7-degree of freedom. Using overlapping decomposition, the full car model is decentralized by two half car models. For each half car model, a robust eigenstructure assignment controller can be obtained by using optimization approach. The performance of the decentralized robust EA controller is compared with that of a conventional centralized EA controller through computer simulations.

• Journal of Information Technology and Architecture
• /
• v.9 no.2
• /
• pp.155-166
• /
• 2012

Recently EA(Enterprise Architecture) has been receiving growing attentions again from the public sectors. It is because EA maturity result is reflected to the organization's informatization level and EA maturity ratio has been enlarged. There has been more participation from the Chief Information Officers of the public sectors. EA research in the public sectors has influenced IT environment since the research started in late '90, the legislation work done in '05, and the maturity model developed in '06. However, there are some remaining tasks to solve. EA policy is introduction oriented, its contribution to the consecutive the best UN e-Government rank is limited, and its user-friendly responding system is still lacking. Related research outcomes are rather microscopic focusing only on the models and maturity than implicating on the public policy in a macroscopic manner. In this respect, this study will provide the implication on how EA policy should be. Requirements derived from EA stakeholders and the tasks will be arranged in accordance with its domain, then the performance and tasks will be demonstrated. As guiding EA stake holders and information related officers to setup the EA policy with these results, this study is expected to support information the policy drivers.

• Proceedings of the Korean Information Science Society Conference
• /
• 2003.10c
• /
• pp.115-117
• /
• 2003

ea­RED(Efficient Adaptive RED)[1][2] 라우터 버퍼 관리 알고리즘 성능 향상을 위해서 ea­RED 라우터 버퍼 사이즈 변화를 예측할 수 있는 예측 알고리즘 모듈의 추가 필요성을 느낀다. 그래서 본 논문에서는 ea­RED 라우터 버퍼 관리 알고리즘의 원형인 RED 라우터 버퍼 관리 알고리즘에 AR(AutoRegression Analysis), IIR(Infinite Impulse Response) MACD(Moving Average Convergence & Divergence), LR_Lines(Linear Regression Lines)등의 예측 알고리즘 모듈을 적용하여 변화를 살펴보고. 결과를 비교. 분석하여 ea­RED 라우터 버퍼 관리 알고리즘 성능 향상에 가장 적합한 예측 알고리즘으로 LR_Lines를 선정했다. ea­RED 라우터 버퍼 관리 알고리즘에 적합한 예측 알고리즘 선정을 위해서 RED 라우터 버퍼 관리 알고리즘을 대신 이용한 이유는 ea­RED 라우터 버퍼 관리 알고리즘의 경우 네트워크 상황에 따라, 버퍼 관련 파라미터 값을 수시로 바꾸기 때문에 예측 알고리즘의 정확성을 판단하는데 어려움이 있지만, RED 라우터의 경우는 버퍼 관련 파라미터 값을 변화시키지 않기 때문에, 좀 더 일관성 있고 정확한 분석을 수행할 수 있기 때문이다.

• Journal of Information Technology Services
• /
• v.12 no.3
• /
• pp.289-309
• /
• 2013

Korea has been ranked at the top consecutively in UN e-Government Survey. This fact reflects consistent efforts by public institutes in Korea. However, there were some duplicate efforts and inefficiency in the investment into IS(information systems). In other words, management and decision making on e-government have yet to improved. Accordingly, governmental institutes have long been promoting policies for EA in order to carry out and manage effectively IT projects including the e-Government projects. EA is being regarded as a means to facilitate IT Governance for systematic management of IT projects, A major objective is to firmly establish the decision making process for IS investment through EA, since the each institute is a large organization with so complicated and specialized demand for IS. As a result, systematic decision making is becoming quite difficult. Thus, this study attempts to identify different types of IT investment decision making and to figure out the relationship between the decision types and the organizational performance of public institutes where EA was implemented.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2006.05b
• /
• pp.61-64
• /
• 2006

Comparing with traditional high performance concrete, ultra high performance concrete (UHPC) has the property of high-tenacity. However, drying shrinkage and autogenous shrinkage can be arisen as the major defect to UHPC. In this study, therefore, it was tested to reduce drying shrinkage and autogeneous shrinkage by adding expanding admixture (EA) and shrinkage reducing agent (SRA). As a result, for a case drying shrinkage, the shrinkage was decreased by 94% when EA was exchanged, and it was decreased by 64% when SRA was added. For the case of autogenous shrinkage, the mortar was expanded at early age and the shrinkage was decreased by 87% when EA was exchanged, and the shrinkage was decreased by 70% when SRA was added.

• Korean Journal of Organic Agriculture
• /
• v.15 no.4
• /
• pp.339-353
• /
• 2007

It is important to facilitate consumers' purchases of EAP (Environment-friendly Agricultural Products) for establishing the successful Environment-friendly Agriculture (EA). This study was conducted to evaluate the present state of some potentially influential factors on consumers' purchasing decisions of EAP using Importance- Performance Analysis (IPA). A total of 299 Gwangju citizens participated in the questionnaire survey during September and October, 2007. Urgent improvement efforts are needed for "reliability about the safety of the EAP", "reliability on EAP certification mark", "credibility of EAP producers", and "growth of EA". Respondents also seem to have positive attitudes to EA activation.

• Fire Science and Engineering
• /
• v.12 no.1
• /
• pp.9-14
• /
• 1998

The hepatfluoropropane(HFC-227ea) synthesis by fluorinatino of hepafluoroproylene(HFP) over activated carbon has been studied. The reaction temperature was varied from 5$0^{\circ}C$ to 40$0^{\circ}C$ at a constant feed mole ration and a residence time. The optimized reaction temperature was found to be about 20$0^{\circ}C$ at 2.5HF/HFP mole ratio and 238 sec. residence time. From these reaction conditions, the yield of HFC-227ea was obtained above 99% and the deactivation of activated carbon was not appeared. Accordingly, the activated carbon showed good performance to obtain heptafluoropropane by fluorinatin of hexafluoropropylene.