• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권3호
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• pp.886-905
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• 2012

Set-top Box (STB) has evolved from being a device just sitting on top of a TV shelf to a device providing a gateway to the Internet for a home network, receiving services from multiple content providers, and enabling and ensuring Quality of Service (QoS) for the streaming media. IP Multimedia Subsystem (IMS), with its promise to provide a converged access network for multimedia service delivery (such as Triple play & Quadruple play services), has to guarantee QoS support. To enable QoS in IMS-based networks, we have designed a set-top box which provides feedback to the service provider to ensure end-to-end QoS. Our set-top box is designed to provide virtual platforms such that it can support multiple service providers. Each service provider is able to manage its own multimedia streams and ensures the desired network performance for each flow. The set-top box also works as a Home Gateway and provides end-to-end QoS support to the client nodes.

• 한국인쇄학회지
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• 제29권3호
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• pp.77-96
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• 2011

Most of all manufacturing industries are pursuing the manufacturing process innovation through the production process automation but the printing industry still does not get out of the analog ways of the entire process compared the entire manufacturing industry. Today, many printing enterprises have the difficulties by the short for delivery, multi-item small amount printing, high quality, rise in raw material cost, drop in receiving order cost, and etc. The printing industry can get over these difficulties and issues by implementing the compact workflow line, merge with the others, automatization and networking, minimization of the repetitive operation, efficiency of the working process, optimization of the operators' value creation, minimization of cost and materials and fast make-ready. The object of this thesis establishes the experimental data and study cases applicable in the printing industry by having high labor productivity and work in line with printing industry processes through "lean printing system".

• Applied Microscopy
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• 제38권2호
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• pp.73-79
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• 2008

현재 생물학 분야에서 세포 구조를 3차로 구현하기 위해 전자 현미경을 이용하는 연구는 매우 빠르게 발전하고 있다. 최근에는 시료의 구조를 변형시키는 화학 고정법 대신 시료를 빠른 시간 내에 동결고정시킴으로써 구조 변형 없이 세포 3차 구조 구현이 가능해졌다. 이러한 기술의 도입으로 단편이미지로만 세포 구조를 이해해왔던 지금까지와 달리 Cryo-ET를 통해 인위적인 구조 변형 없는 3차 구조 구현이 가능해졌고, 이 기법은 약물전달, 나노 공학 등 여러 학문 분야에 활용됨으로써 학문 발전에 이바지 할 것이다.

• Journal of Hospice and Palliative Care
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• 제15권4호
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• pp.188-192
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• 2012

Palliative medicine has shown demonstrated benefit for patients with serious illness, their families, and hospital systems. As such, the demand for palliative care services is growing at a fast pace, and health care facilities frequently struggle to develop and implement effective and sustainable methods of providing this care. As with any new system, challenges and barriers naturally exist to instituting palliative care. Undertaking careful assessment, planning, and resource allocation can provide the greatest likelihood of success when developing these novel yet much needed models of care. This summary paper offers a qualitative overview of the potential benefits and the rationale to implement robust palliative care systems. We briefly review the history of palliative medicine in the broadest sense and address several seminal works from the US palliative care literature. Core practices to establish and advance palliative medicine are suggested. Commentary is provided on some of the particular barriers to palliative system development that may need to be addressed in the context of Korean medical culture. Collectively, we hope this overview can contribute to a framework within which such research and development can occur, leading to increasingly effective and sustainable palliative medicine in Korea.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권2호
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• pp.542-558
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• 2016

Vehicular Ad Hoc Networks (VANETs) are self-configuring networks where the nodes are vehicles equipped with wireless communication technologies. In such networks, limitation of signal coverage and fast topology changes impose difficulties to the proper functioning of the routing protocols. Traditional Mobile Ad Hoc Networks (MANET) routing protocols lose their performance, when communicating between vehicles, compromising information exchange. Obviously, most applications critically rely on routing protocols. Thus, in this work, we propose a methodology for investigating the performance of well-established protocols for MANETs in the VANET arena and, at the same time, we introduce a routing protocol, called Genetic Network Protocol (G-NET). It is based in part on Dynamic Source Routing Protocol (DSR) and on the use of Genetic Algorithms (GAs) for maintenance and route optimization. As G-NET update routes periodically, this work investigates its performance compared to DSR and Ad Hoc on demand Distance Vector (AODV). For more realistic simulation of vehicle movement in urban environments, an analysis was performed by using the VanetMobiSim mobility generator and the Network Simulator (NS-3). Experiments were conducted with different number of vehicles and the results show that, despite the increased routing overhead with respect to DSR, G-NET is better than AODV and provides comparable data delivery rate to the other protocols in the analyzed scenarios.

• 한국컴퓨터정보학회논문지
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• 제5권4호
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• pp.200-210
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• 2000

전자상거래상의 물적 분배시스템에서는 수요자 중심의 분배활동을 우선하므로 신속한 수송과 낮은 물류비용이 기업의 경쟁력을 좌우한다. 그러나 물류거점 단계별로 협력체계가 구축되지 않은 기존 유통망 하에서는 전체적인 물류시스템 최적화를 추구할 수 없는 상황이며, 이에 대한 연구도 미비한 실정이다. 본 연구에서는 다단계 분배시스템을 대상으로 최적의 주문 및 수송정책을 통한 전체 시스템의 비용을 절감하기 위하여 비용모형을 분석함으로써 전체 시스템이 공동 로트크기를 결정할 수 있는 방안을 제시한다. 본 연구의 결과는 앞으로 수송비의 최소화하는 수송차량과 수송량의 통합 등의 물류공동화를 위한 알고리즘 개발에 기여할 수 있을 것으로 기대한다.

• 한국통신학회논문지
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• 제38C권7호
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• pp.605-611
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• 2013

본 논문은 차량이 사고가 발생하였을 때, 사고 차량이 가까이에 있는 주위 차량에 긴급메시지를 전파하여, 다른 차량의 운전자들이 사고지점을 인지하고 회피할 수 있도록 효과적이고 빠른 브로드캐스트 기법에 관하여 기술하였다. 본 논문에서는 GPS(Global Position System)가 장착된 도심환경의 차량 네트워크에서 긴급 메시지를 빠르게 전파하는 방법을 제안한다. 전송 차량은 연속적이고 효과적인 메시지 전파를 위해 가장 멀리 있는 차량을 다음 릴레이 차량으로 미리 선정하고 전파를 하는 기법을 제안한다. 그리고 RSU(Road Side Unit)의 도움 없이 교차로를 인식할 수 있는 알고리즘을 제안하며, 끊어진 네트워크 상황에 대처하기 위해 헬로 메시지를 이용한 SCF(Store-Carry-Forward) 기법을 제안한다.

• 마이크로전자및패키징학회지
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• 제20권3호
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• pp.1-6
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• 2013

TSV는 그동안 3D IC 적층을 하는데 핵심 기술로 많이 연구되어 왔고, RC delay를 줄여 소자의 성능을 향상시키고, 전체 시스템 사이즈를 줄일 수 있는 기술로 각광을 받아왔다. 최근에는 TSV를 전기적 연결이 아닌 소자의 열관리를 위한 구조로 연구되고 있다. TSV를 이용한 liquid cooling 시스템 개발은 TSV 제조, TSV 디자인 (aspect ratio, size, distribution), 배선 밀도, microchannel 제조, sealing, 그리고 micropump 제조까지 풀어야 할 과제가 아직 많이 남아있다. 그러나 TSV를 이용한 liquid cooling 시스템은 열관리뿐 아니라 신호 대기시간(latency), 대역폭(bandwidth), 전력 소비(power consumption), 등에 크게 영향을 미치기 때문에 3D IC 적층 기술의 장점을 최대로 이용한 차세대 cooling 시스템으로 지속적인 개발이 필요하다.

• Journal of Dental Anesthesia and Pain Medicine
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• 제16권1호
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• pp.25-29
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• 2016

Background: The most important reason for pre-operative administration of medication is to reduce anxiety. Alleviation of fear and anxiety about surgery enables patients to remain comfortable during treatment. Dexmedetomidine (DEX) is a fast-acting drug that is used as a premedication in different circumstances because it has sedative and anti-anxiolytic effects, and stable hemodynamics. It also has the advantage of intranasal administration. The aim of this study was to investigate the effects and hemodynamic stability of DEX by retrospectively analyzing cases in which DEX was administered nasally as a premedication. Methods: Ten patients treated at Dankook University Dental Hospital, recruited between February and April 2015, received intranasal delivery of $2{\mu}g/kg$ DEX, 30 minutes prior to general anesthesia. Anesthesia records of anxiety, blood pressure, respiration, pulse, estimated arterial oxygen saturation ($SpO_2$), and partial pressure, or maximum concentration, of carbon dioxide ($ETCO_2$) were analyzed. Results: Administration of DEX prior to a general anesthetic effectively relieved anxiety. Respiratory depression, the most severe adverse effect of other sedatives, was not observed. Hemodynamic stability under general anesthesia was maintained during treatment and a reduction in emergence delirium was observed upon completion of treatment. Conclusions: Premedication administration of DEX is safe for pediatric patients undergoing dental treatment under general anesthesia.

• Industrial Engineering and Management Systems
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• 제9권3호
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• pp.196-203
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• 2010

Make-to-forecast production is a way to realize high customization and fast responsiveness. This study firstly investigates the effect of introducing a common component in a make-to-forecast production environment. The common component can eliminate a modification step, which is a major cost component in make-to-forecast production. It is illustrated, however, that introducing a versatile component that merely covers several variants is unattractive, and thus adding values to the common component is inevitable in this environment. Secondly, an order-matching rule under the condition that two partially overlapped delivery lead time intervals exist is proposed. The rule considers the effect of matching orders to units that can cover both intervals. An alternative re-matching rule is also developed and examined. Numerical experiments clarify that the proposed rule generally realizes higher contribution ratio and lower percentages of orphans and rejected orders. The proposed re-matching rule increases the average contribution ratio at the expense of increased orphans and order rejections.