• 한국정보통신학회논문지
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• 제9권5호
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• pp.973-980
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• 2005

본 논문에서는 ABR(Available Bit Rate) 트래픽의 흐름제어를 방식들을 분석하고, 지연이 큰 PNNI망에서 VS/VD 스위치를 이용하여 효율적으로 ABR 트래픽을 제어하여, 공평한 전송율을 계산할 수 있는 알고리즘을 제안하였다. 제안된 알고리즘에서는 전송율을 계산하기 위하여 정확하고 공평한 분배를 계산할 수 있는 ER(Explicit Rate) 방식의 FMMRA(Fast Max-Min Rate Allocation)를 사용하였다. 그리고, 지연이 많이 된 상태에서도 큐에 있는 셀을 서비스하고 드레인 하기 위하여, VD에서 VS로 전달된 큐 길이 정보를 이용하여 전송율을 계산함으로서 공평한 셀 서비스 분배를 할 수 있었다. 컴퓨터 시뮬레이션을 통하여 제안된 알고리즘의 성능을 평가하였으며, 그 결과 만족할만한 성능을 얻을 수 있었다.

• Journal of Construction Engineering and Project Management
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• 제2권4호
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• pp.11-19
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• 2012

Construction supply chain management (CSCM) has become one of the critical factors that determine the success of a construction project as it becomes increasingly complicated and mega-sized. Particularly for high-rise or mega-sized building construction, just-in-time supply chain management is required due to lack of storage space and effective logistics for construction components and materials at a construction site. Despite the fact that research and development of radio frequency identification (RFID) and wireless sensor network (WSN) technology have been performed, construction project managers still need to carry mobile devices and check material and component flow at each stage of the supply chain process. This research proposes that the equipment used in the construction supply chain process, such as movers, trailers, gates, and hoists, can become main actors in the supply chain process using RFID and WSN technologies. And the proposed equipment and process focused on a solution to the redundancy identification problem, which has been observed in operations that use RFID/WSN-based processes for construction logistics. This paper also presents issues identified through verification and validation of the research results and proposes further studies.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2017년도 춘계학술대회 논문집
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• pp.134.1-134.1
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• 2017

In this study, we propose a new scaffold fabrication method, "direct electro-hydrodynamic jet process," using the initial jet of an electrospinning process and ethanol media as a target. The fabricated threedimensional (3D) fibrous structure was configured with multilayered microsized struts consisting of randomly entangled micro/nanofibrous architecture, similar to that of native extracellular matrixes. The fabrication of the structure was highly dependent on various processing parameters, such as the surface tension of the target media, and the flow rate and weight fraction of the polymer solution. As a tissue regenerative material, the 3D fibrous scaffold was cultured with preosteoblasts to observe the initial cellular activities in comparison with a solid-freeform fabricated 3D scaffold sharing a similar structural geometry. The cell-culture results showed that the newly developed scaffold provided outstanding microcellular environmental conditions to the seeded cells (about 3.5-fold better initial cell attachment and 2.1-fold better cell proliferation).

• 유통과학연구
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• 제14권6호
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• pp.27-37
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• 2016

Purpose - This study aims to suggest a developmental direction to small enterprisers who start their business. The developmental direction makes the small enterprisers more stable with providing the Business District Information System service, which offers the location and business area's information aimed at pre-enterprisers after analyzing its overcrowded index's current state and problems. Research design, data, and methodology - This research proposes the developmental direction for helping the pre-small enterprisers to have more stability through examining the Business District Information System's-operated by Small Enterprise and Market Service-overcrowded index's current state and problems. Results - This system has drawbacks about giving the start-up overcrowded index as follows: ① non-accurate consultative group for sharing the DB ② providing analysis information, not evaluation information ③ not to anticipate the changes of business types & the flow of business district and perceive the symptom data with providing predictive information. Conclusions - This system should be more publicized through the mass media for making it approachable with collecting the user's opinion and investigating customer satisfaction & the level of awareness.

• 한국문헌정보학회지
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• 제54권3호
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• pp.285-314
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• 2020

The healthcare environment is becoming increasingly dependent on health information technology (HIT), with healthcare providers, patients, and other people engaged in the field producing and sharing information to improve healthcare delivery. This focus has raised the issue of Health Information Infrastructure (HII) to the forefront of policy, design, and law. While several studies have examined each element of HII, little attention has been paid to the overall infrastructure as a collection of technologies, institutions, standards, and practices. In order to fill the gap, this study focuses on medication reconciliation as an example of the wider phenomenon of HII. In particular, the study examines a medication reconciliation process (MRP) as an example to understand the key challenges facing the development of HII, how the challenges are interrelated, and how they can be met as a whole. Following a mixed methodology, involving workflow study, focus group discussions, and in-depth interviews, the study examines "data friction" along technical, institutional, regulatory, and legal dimensions. This study constitutes one of the first efforts to comprehensively investigate health information infrastructure and how technology and other dimensions in infrastructure are interrelated. The study therefore contributes to a better understanding of HII and the practical challenges that hinder the seamless flow of information in the healthcare environment.

• 한국비블리아학회지
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• 제14권2호
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• pp.119-140
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• 2003

국가 통합정보망 구축을 통하여 지식과 정보의 생산, 유통 및 활용을 극대화할 수 있다. 지식기반사회를 형성하는 기본적인 정보망은 교육, 노동시장, 산학협동 그리고 평생교육 정보망으로구성된다. 이들 네 영역의 정보망에 대한 현황과 문제점 분석을 기반으로 하여 국가인적자원개발을 위한 체계적인 통합정보망 구축방안을 제시하고자 한다. 국가 통합정보망 구축 방향을 정보기반 인프라와 정보지원 인프라로 구분하여 제시하고 있다. 정보기반 인프라를 위하여 지식과 정보에 대한 디지털화의 촉진, 접근성 향상, 컨텐츠 개발 등이 필요하며, 정보지원 인프라를 위해서는 법적$\cdot$제도적 기반 정비, 행$\cdot$재정 지원체제 정비 그리고 다양한 인적자원개발 정책이 요구된다.

• 전력전자학회논문지
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• 제23권5호
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• pp.328-335
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• 2018

An energy management method of DC microgrids using voltage compensation term is proposed in this study. Droop control is often implemented to operate the DC microgrid. However, the droop control necessarily generates voltage variation. Energy flow is also difficult to control because the droop control mainly focuses on proportional load sharing. To solve these problems, the voltage compensation term based on the low-bandwidth communication is used to determine the operating band of the converter. Energy management and voltage variation minimization can be achieved by judging the operating band according to the magnitude of voltage compensation term. The validity of the proposed method is verified by simulation and experiments.

• 정보처리학회논문지A
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• 제17A권5호
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• pp.249-258
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• 2010

로봇 어플리케이션의 활용도는 사회 전반에서 점차 확대되고 있지만 로봇들의 컴퓨팅 자원 차이로 인해 한 로봇에서 다양한 어플리케이션을 실행하기는 힘든 실정이다. 본 논문에서는 로봇이 주변 장치와의 자원 공유를 통해 자원의 제약을 극복하는 프레임워크를 제안한다. 프레임워크는 협업에 요구되는 공통 구성 요소들을 정의하고 어플리케이션을 쉽게 제작할 수 있는 API를 제공한다. 로봇과 다른 장치가 네트워크로 연결된 환경에서 동작하는 로봇을 이용한 체조 학습 어플리케이션의 예시를 통해 프레임워크의 동작 흐름을 보인다.

• 설비공학논문집
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• 제20권12호
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• pp.775-780
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• 2008

A dynamic model to simulate LNG reliquefaction process has been developed. The model was applied to two candidate cycles for LNG reliquefaction process, which are Reverse Brayton and Claude cycles. The simulation was intended to simulate the pilot plant under construction for operation of the two cycles and evaluate their feasibility. According to the simulation results, both satisfy control requirements for safe operation of brazed aluminum plate-fin type heat exchangers. In view of energy consumption, the Reverse Brayton cycle is more efficient than the Claude cycle. The latter has an expansion valve in addition to the common facilities sharing with the Reverse Brayton cycle. The expansion valve is a main cause to the efficiency loss. It generates a significant amount of entropy associated with its throttling and increases circulation flow rates of the refrigerant and power consumption caused by its leaking resulting in lowered pressure ratio. It is concluded that the Reverse Brayton cycle is more efficient and simpler in control and construction than the Claude cycle.

• 한국전자거래학회지
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• 제5권2호
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• pp.27-47
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• 2000

Recently firms which have been using traditional VAN-EDI are adapting Web-EDI at very rapid pace. Based on the Internet, Web-EDI is easier to install, is cheaper and more accessible than VAN-EDI. Web-EDI establishes an electronic hierarchy as a type of Inter-Organization Information System. An electronic hierarchy connects two legally separate firms in an electronically mediated relationship. The primary reasons for establishing an electronic hierarchy is to improve the flow of materials and information between firms. This paper suggests two hypotheses that describe the possible impact of Web-EDI on firms in the Web-EDI network, and empirically tests them using data from a case study based on a discount store. The result is as follows. First, the more a firm utilizes information shared through Web-EDI, the higher the inventory turns. Second, a higher level of information sharing does not necessarily increase the inventory turns of Web-EDI adopters who are coerced to implement the electronic networks by the champion. These findings imply that the operational performance of Web-EDI adopters can be improved only when the firms intensively utilize the information shared through Web-EDI for their business processes.