• 전자공학회논문지
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• 제50권10호
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• pp.21-29
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• 2013

본 논문에서는 U-헬스케어를 위한 무선 매쉬 네트워크에서 고 신뢰성 있는 응급 생체 데이터 관리를 위한 정책기반의 신원 인증 및 전송 구조를 제시한다. U-헬스케어 모니터링 서비스에서 모니터링 되는 응급 생체 데이터는 생명과 직결되기 때문에 고 신뢰성 있는 생체 데이터 관리 뿐만 아니라 데이터 전송 관리가 요구된다. 좀 더 구체적으로, 측정된 생체 데이터의 신원 인증 기술과 인증된 생체 데이터의 개인 맞춤형 응급 상태 진단 기술, 응급 데이터 전송 기술이 무엇보다 중요하다. 이를 위해, 본 논문에서는 무선 매쉬 네트워크 환경에서 IEEE 11073 PHD를 확장한 정책기반 신원 인증 관리 구조 및 프로토콜, 고 신뢰성 있는 관리를 위한 정책 기반 응급 데이터 관리 구조, 신뢰성 있는 데이터 전송을 위한 무선 매쉬 네트워크 기반의 Resilient 라우팅 프로토콜을 제시한다.

• Archives of Plastic Surgery
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• 제39권4호
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• pp.354-359
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• 2012

Background During the planning of a thoracodorsal artery perforator (TDAP) free flap, preoperative multidetector-row computed tomographic (MDCT) angiography is valuable for predicting the locations of perforators. However, CT-based perforator mapping of the thoracodorsal artery is not easy because of its small diameter. Thus, we evaluated 1-mm-thick MDCT images in multiple planes to search for reliable perforators accurately. Methods Between July 2010 and October 2011, 19 consecutive patients (13 males, 6 females) who underwent MDCT prior to TDAP free flap operations were enrolled in this study. Patients ranged in age from 10 to 75 years (mean, 39.3 years). MDCT images were acquired at a thickness of 1 mm in the axial, coronal, and sagittal planes. Results The thoracodorsal artery perforators were detected in all 19 cases. The reliable perforators originating from the descending branch were found in 14 cases, of which 6 had transverse branches. The former were well identified in the coronal view, and the latter in the axial view. The location of the most reliable perforators on MDCT images corresponded well with the surgical findings. Conclusions Though MDCT has been widely used in performing the abdominal perforator free flap for detecting reliable perforating vessels, it is not popular in the TDAP free flap. The results of this study suggest that multiple planes of MDCT may increase the probability of detecting the most reliable perforators, along with decreasing the probability of missing available vessels.

• 한국통신학회논문지
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• 제24권12B호
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• pp.2359-2368
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• 1999

본 논문에서는 2차원 영상을 기반으로 3차원 목표물을 인식하는 기법의 한 예로서 적외선 영상으로부터 추출된 물체의 모양 정보와 모양 정보의 신뢰도를 이용해서 지상에서 지상용 차량을 인식하는 기법(ground-to-ground vehicle recognition)을 제안한다. 우선 목표물 추출과정에서 얻어진 마스크의 윤곽선 상에 있는 점들 중 에지 경사도의 크기와 밝기값이 일정한 값 이상이 되는 점들을 신뢰도가 높은 점이라고 정의하고 신뢰도가 높은 점들을 연결해서 신뢰도가 높은 부분 윤곽선(sub-contour)을 추출한다. 모델로부터 입력 영상의 신뢰도가 높은 윤곽선에 해당되는 윤곽선을 선택한 후 각각 해당되는 윤곽선들은 이산 정현 변환(Discrete Sine Transform)을 사용해서 특징값을 계산한 다음 서로 비교한다. 실험 결과 영상 분할이 불완전한 경우 신뢰도를 이용한 방법이 그렇지 않은 방법보다 더 나은 결과를 보였다.

• 항공우주기술
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• 제13권2호
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• pp.38-46
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• 2014

CRC (Cyclic Redundancy Codes)는 데이터 전송 시 오류 발생 유무를 검출하기 위한 하나의 방법으로, 정지궤도복합위성(GEO-KOMPSAT 2B) 개발에서는 정지궤도환경탑재체와 위성 간의 GRDDP (GOES-R Reliable Data Delivery Protocol)에 사용되고 있다. 본 논문에서는 CRC를 구현할 때 널리 사용하는 테이블 기반 CRC의 원리를 소개하고, 이를 기반으로 환경탑재체 개발에서 사용 중인 CRC8을 소프트웨어로 구현한 결과를 설명한다.

• Transactions on Control, Automation and Systems Engineering
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• 제2권1호
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• pp.31-39
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• 2000

We present a robust and reliable H$\infty$ state-feedback controller design for linear uncertain systems, which have norm-bounded time-varying uncertainty in the state matrix, and their prespecified sets of actuators are susceptible to failure. These controllers should guarantee robust stability of the systems and H$\infty$ norm bound against parameter uncertainty and/or actuator failures. Based on the linear matrix inequality (LMI) approach, two state-feedback controller design methods are constructed by formulating to a set of LMIs corresponding to all failure cases or a single LMI that covers all failure cases, with an additional costraint. Effectiveness and geometrical property of these controllers are validated via several numerical examples. Furthermore, the proposed LMI frameworks can be applied to multiobjective problems with additional constraints.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(1)
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• pp.225-228
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• 2000

In this paper, a design of the reliable video-conference system using CTI(Computer Telephony Integration) technology is proposed. When video-conference is run on the current existing Internet, the transmission delay problem for voice data traffic can be frequently occurred. In order to transmit the real-time voice data through the Internet efficiently, some complicated algorithms such as CODEC(Code/Decode) should be applied. It can cause further excessive processing delay which can affect the overall performance. The voice traffic is usually transmitted through the reliable PSTN(Public Switched Telephone Network) in the CTI system. In this paper a new architecture, in which PSTN for voice traffic and Internet for video traffic are used at the same time instead of using Internet by itself, is proposed to relieve the problems on a video conference.

• 인터넷정보학회논문지
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• 제10권3호
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• pp.51-60
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• 2009

본 논문은 다양한 공격들(헬로우 플러딩공격, 위치배치공격, 웜홀 공격, 싱크홀 공격, 중간포획공격)로부터 안전한 방어를 보장해야 하는 무선센서네트워크상에서 확률적 키 사전분배를 위한 신뢰성있는 2-모드 인증 프레임워크를 제안한다. 신뢰하는 이웃 노드의 ID를 저장하는 본 기법은 클러스터 헤드에서의 의존성을 감소시키며, 그 결과로 인증처리를 위한 단대단 전송을 제공할 뿐 아니라 소모되는 전력 에너지도 절약한다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회 논문집
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• pp.1538-1542
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• 2005

This study is to secure more accurate data of the discharge on the measurement by gaining a reliable hydrological data through the comparison the present method of measuring them and the other way that is based ISO. This study suggests the applicable measurement method of the discharge that has reliance through general elements and the analysis of uncertainty by comparing and assaying the data of the Hyung San River that is measured by the present standard. The result of this study makes us realize that we should complement the measurement method of the discharge securing the reliable and accurate hydrological data Hydrological data is very important things to perform domestic river works or install some structure in river or coast. Securing reliable and accurate hydro-data and making a thesis should go on in other to do any construction in river or coast.

• Journal of Electrical Engineering and Technology
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• 제4권2호
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• pp.149-158
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• 2009

It is important to derive reliable parameter values in the measurement-based load model development of electric power systems. However parameter estimation tasks, in practice, often face the parameter identifiability issue; whether or not the model parameters can be estimated with a given input-output data set in reliable manner. This paper introduces concepts and practical definitions of the local identifiability of model parameters. A posteriori local identifiability is defined in the sense of nonlinear least squares. As numerical examples, local identifiability of third-order induction motor (IM) model and a Z-induction motor (Z-IM) model is studied. It is shown that parameter ill-conditioning can significantly affect on reliable parameter estimation task. Numerical studies show that local identifiability can be quite sensitive to input data and a given local solution. Finally, several countermeasures are proposed to overcome ill-conditioning problem in measurement-based load modeling.

• 조명전기설비학회논문지
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• 제24권12호
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• pp.64-70
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• 2010

High capacity UPS and emergency generators are commonly employed at facilities where power interruption is not allowed. Nowadays, combinations of existing commercial incoming power and an emergency generator or combination of multiple generators and CTTS(Closed Transition Transfer Switch) is adopted sometimes for more reliable power supply. In this paper, application of CTTS and STS(Static Transfer Switch) to dual-power line is suggested for highly reliable uninterruptible power. By realizing such a system, construction of incoming power facilities, installation of emergency generator and large capacity UPS can be omitted, through which saving of the installation space and corresponding capital investment can be expected.