• JSTS:Journal of Semiconductor Technology and Science
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• v.9 no.2
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• pp.75-79
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• 2009

A system-on-a-chip communication architecture has a significant impact on the performance and power consumption of modern multi-processors system-on-chips (MPSoCs). However, customization of such architecture for a specific application requires the exploration of a large design space. Thus, system designers need tools to rapidly explore and evaluate communication architectures. In this paper we present the method for application-specific low-power bus architecture synthesis at system-level. Our paper has two contributions. First, we build a bus power model of AMBA AXI bus communication architecture. Second, we incorporate this power model into a low-power architecture exploration algorithm that enables system designers to rapidly explore the target bus architecture. The proposed exploration algorithm reduces power consumption by 20.1% compared to a maximally connected reduced matrix, and the area is also reduced by 20.2% compared to the maximally connected reduced matrix.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04b
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• pp.388-390
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• 2002

Java 2 Enterprise Edition(J2EE)의 등장으로 국내.외 수많은 기업들은 J27E의 모델에 맞게 엔터프라이즈 어플리케이션을 개발하고 있다. 이것은 J2EE의 핵심 기술 요소인 Enterprise JavaBeans(EJB)의 컴포넌트모델이 분산 객체 어플리케이션의 개발 과정을 간단하게 해주기 때문이다. EJB 어플리케이션은 여러 개의 빈들로 구성된다. EJB 어플리케이션의 서비스는 클라이언트의 요청에 따른 빈의 비즈니스 메소드의 실행으로 이루어진다. 따라서 EJB 어플리케이션의 성능은 클라이언트의 요청에 따라 처리하는 빈에서의 측정과 요청을 처리하는 비즈니스 메소드의 측정에 매우 중요하다. 본 논문에서는 EJB 어플리케이션에서 클라이언트의 서비스 요정에 따라 수행하는 빈 단위에서의 성능 메트릭을 제시한다. 클라이언트의 서비스 요청은 요청을 받은 번에서의 메소드 실행으로 나타난다. 메소드의 유형을 분류하고, 각 유형에 따른 메트릭을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.616-618
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• 2001

J2EE(Java™ 2 Platform, Enterprise Edition) 커넥터 아키텍처(Connector Architecture)는 J2EE 플랫폼을 다양한 EIS와 연결하기 위하여 공통 클라이언트 인터페이스(CCI:Common Client Interface)를 정의한다. CCI의 커넥션 메커니즘은 추상 팩토리 패턴(Abstract Factory Pattern)을 따르고 있다. 추상 팩토리 패턴을 이용함으로써 커넥터 아키택처는 각기 상이한 커넥션과 커넥션 팩토리가 독립적인 벤더들에 의해 독립적으로 구현될 수 있게 한다. 브리지 패턴(Bridge Pattern)은 추상화 정도와 구현에 따라 추상 클래스와 구현 클래스를 별도의 클래스로 구현하여 이들이 동적으로 조합되도록 한다. 본 논문에서는 추상 팩토리 패턴을 따르고 있는 CCI의 터넥션 메커니즘을 브리지 패턴을 적용하여 확장된 커넥션 메커니즘을 제시한다. 추상 팩토리 패턴은 클래스의 생성과 관련 있는 생성 패턴(Creational Pattern)인 반면 브리지 패턴은 구조 패턴(Structural Pattern)이다. 즉, 대행하는(delegation)클래스의 행위들을 중계해 준다. 구조 패턴은 새로운 기능을 구현하기 위해 객체를 구성하는 방식에 초점을 두며, 실행 시에 객체 컴포지션 구조를 변경할 수 있어 이를 통해 유동성과 확장성을 추가할 수 있다.

• Bulletin of the Korean Chemical Society
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• v.8 no.5
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• pp.421-423
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• 1987

The chiral B-isopinocampheyl-9-borabicyclo[3.3.1]nonane-potassium hydride (IPC-9-BBN-KH) and potassium B-isopinocampheyl-9-boratabicyclo[3.3.1]nonane (K IPC-9-BBNH) systems were applied to the enantioselective reduction of representative racemic epoxides, namely 1,2-epoxybutane, 1,2-epoxyoctane, 3,3-dimethyl-1,2-epoxybutane and styrene oxide. In the case of IPC-9-BBN-KH system, the optical yields are in the range of 8.3-37.4$\%$ ee. However, the system of K IPC-9-BBNH provides significantly lower optical yields, showing 7-22.5$\%$ ee. These results strongly suggest that the enantioselective coordination of chiral organoborane to the epoxy oxygen of racemic epoxides plays an important role in this resolution.

• Korean Journal of Medicinal Crop Science
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• v.22 no.3
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• pp.217-222
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• 2014

This study was to investigate anti-skin wrinkle effect of aronia extracts by extraction processes. The 70% ethanol extract by ultrasonification process (UEE) showed highest DPPH scavenging activity of 90.4% in order water extract (WE), 70% ethanol extract (EE) was measured 84.2%, 84.3%. collagen production measured $245ng/m{\ell}$ from UEE. WE was measured $53.5ng/m{\ell}$ and EE was measured $224.4ng/m{\ell}$. MMP-1 production was observed lowest $22.5pg/m{\ell}$ at UEE. MMP-1 production of EE was $34.6pg/m{\ell}$ and WE was $102.3pg/m{\ell}$. These results were found the highest antioxidant and anti-wrinkle effect at UEE among three processes. It was also confirmed that anti-skin wrinkle activities of the aronia extract was strongly correlated with anti-oxidant activities due to high amounts of antocyanins in the extract.

• Journal of IKEEE
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• v.6 no.2 s.11
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• pp.169-177
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• 2002

In this paper, we introduce a new technology to extract the unique features from an iris image, which uses scale-space filtering. Resulting iris code can be used to develop a system for rapid and automatic identification of persons, with high reliability and confidence levels. First, an iris part is separated from the whole image. Then the radius and center of the iris are obtained. Once the regions that have a high possibility of being noise are discriminated, the features presented in the highly detailed pattern is then extracted from the iris image. Scale-space filtering technique is applied for feature extraction.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1998.06b
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• pp.147-153
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• 1998

This paper provides a method for video augmentation using image interpolation. In computer graphics or augmented reality, 3D information of a model object is necessary to generate 2D views of the model, which are then inserted into or overlayed on environmental views or real video frames. However, we do not require any three dimensional model but images of the model object at some locations to render views according to the motion of video camera which is calculated by an SFM algorithm using point matches under weak-perspective (scaled-orthographic) projection model. Thus, a linear view interpolation algorithm is applied rather than a 3D ray-tracing method to get a view of the model at different viewpoints from model views. In order to get novel views in a way that agrees with the camera motion the camera coordinate system is embedded into model coordinate system at initialization time on the basis of 3D information recovered from video images and model views, respectively. During the sequence, motion parameters from video frames are used to compute interpolation parameters, and rendered model views are overlayed on corresponding video frames. Experimental results for real video frames and model views are given. Finally, discussion on the limitations of the method and subjects for future research are provided.

• Hwankyungkyoyuk
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• v.16 no.1
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• pp.34-47
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• 2003

The purpose of this study is to analyze the program development process of a nonformal environmental education(EE) program in detail. For the purpose, following research questions were answered in "the Nature School in the Forest" program in Eco-Club 1) What is the program development process? 2) What is the role of staffs, program developers, in the program development process? What are the meanings of their pedagogical approach? 3) With the findings of this study, how is the researcher able to develop ground theory for community-based nonformal EE, and to promote theoretical discussion for field improvement? The data were mainly gathered through participation observation and unstructured interview. And the data were analyzed by qualitative techniques such as clustering, factoring, noting pattern and themes, seeing plausibility, making metaphors, and building logical chain of evidence. The following conclusion comes out of the findings of this study. "The Nature School in the Forest" program is a educational device which the community-based NGO chose as a strategy to change individuals and community with its ideological purpose. And the program development process was the contiuous group decision-making process among staffs and volunteers. Consequently "the Nature School in the Forest" program is a circulated process of the voluntary activists training and their participation in program operation.

• Journal of the Korea Safety Management & Science
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• v.17 no.4
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• pp.57-66
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• 2015

This paper reviewed the effect of job burnout on safety outcomes, and the moderating effect of safety climate in Korean Air Force. The prevalence of burnout in air force pilots has not been determined and reviewed. It is also unknown whether pilots' burnout may affect their safety outcomes(safety action & compliance). The primary objective of this study was to determine the prevalence of burnout and it's effect on safety outcomes. For cross-sectional survey, 910 questionnaires were sent to pilots in air force, and 722 questionnaires among them were returned effectively. The questionnaire was divided into 4 parts examining pilots' demographic factors, job burnout, safety outcomes, and safety climates. To test and review proposed hypotheses, hierarchical multiple regression analysis was used. The results of statistical analysis appeared as follow; 1) EE(emotional exhaustion) and RPA(reduced personal accomplishment) effected negatively on safety action. 2) EE and RPA effected negatively on safety compliance. 3) EE effected more positively on safety action in higher SS(superior support) group than in lower SS group. 4) RPA effected more positively on safety compliance in higher SS(superior support) group than in lower SS group. 5) RPA effected more positively on safety action in higher CW(coworker support) group than in lower CW group.

• Journal of Satellite, Information and Communications
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• v.12 no.2
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• pp.51-55
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• 2017

This paper aims to maximize the energy harvesting rate and channel capacity in RF-energy harvesting networks (RF-EHNs) under the constraints of maximum transmit power and minimum quality of service (QoS) in terms of rate capacity for each user. We study a multi-user RF-EHN with frequency division multiple access (FDMA) in a Rayleigh channel. An access point (AP) simultaneously transmitting wireless information and power in the RF-EHN serves a subset of active users which have a power-splitting antenna. To gauge the network performance, we define energy efficiency (EE) and propose an optimization solution for maximizing EE with Lagrangian dual decomposition theory. In simulation results, we confirm that the EE is effectively maximized by the proposed solution with satisfying the given constraints.