• Journal of Oral Medicine and Pain
• /
• v.37 no.3
• /
• pp.135-139
• /
• 2012

Hereditary hemorrhagic telangiectasia is a rare autosomal dorminant disease that features abnormal and fragile vascular dilations of terminal vessels in skin and mucous membranes, as well as arteriovenous malformations of internal organs, particularly lungs, brain, and liver. Often patients have not been diagnosed with HHT for a long time, and undiagnosed HHT patients unnecessarily develop serious complications such as severe life-threatening hemorrhage, stroke or brain abscess. Therefore, early detection and appropriate screening is very important. Early detection of HHT allows the appropriate screening for the presence of silent disease such as AVMs in the lungs, liver, or brain, and preventive treatment in the patient and their affected family members. Dentists should be familiar with HHT because the telangiectases on skin and oral mucosa are often the most dramatic and most easily identified component of HHT. Recently, we experienced a case of HHT. We present the case with a review of the literature.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.13 no.2
• /
• pp.12-26
• /
• 2014

This Study deals with effect of low visibility condition at nighttime on traffic accident. Roads for experiment of this study are Gyeongbu expressway, Seohaean expressway, Yeongdong expressway and Seoul beltway in Gyeonggi province. For this study, I subdivided basic straight section of them into 58 short section. And I analyzed effect of low visibility condition by darkness at nighttime on traffic accident by using 410 traffic accidents between January 1, 2009 and June 30, 2012 on those sections. The Quasi-experimental and negative binomial regression were applied to analyze effect of low visibility condition at nighttime on traffic accident. In this study, I only analyzed visibility difference of daytime and nighttime on traffic accident except other effective variables on traffic accidents. As a result, I have found that it is for low visibility condition at nighttime to have effect on traffic accidents at such specific conditions as Los A speed is maintained in basic straight section of expressway in fine weather. And I tried to do various analysis on types and causes of traffic accidents using the result of analysis.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.30 no.2
• /
• pp.121-125
• /
• 2010

The infrared thermography technology rather than traditional nondestructive methods has benefits with non-contact and non-destructive testings in measuring for the fault diagnosis of the rotating machine. In this work, condition monitoring measurements using this advantage of thermography were proposed. From this study, the novel approach for the damage detection of a rotating machine was conducted based on the spectrum analysis. As results, by adopting the ball bearing used in the rotating machine applied extensively, an spectrum analysis with thermal imaging experiment was performed. Also, as analysing the temperature characteristics obtained from the infrared thermography for in-situ rotating ball bearing under the lubrication condition, it was concluded that infrared thermography for condition monitoring in the rotating machine at real time could be utilized in many industrial fields.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.23 no.7
• /
• pp.145-151
• /
• 2019

The fragility analyses for the partially filled horizontal cylindrical tank having a flexible wall were conducted to evaluate seismic performance. An equivalent simplified model with two lumped masses representing to impulsive and convective masses was used to represent the liquid storage system. This simplified model was validated by comparing its time history analysis results with the 3D FSI model results. The horizontal tank was analyzed under bi-directional excitations. Seismic fragility curves for the stability were developed in transverse and longitudinal directions. Fragility curves show that seismic damage for the horizontal storage system is more susceptible in the transverse direction.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.10 no.10
• /
• pp.2741-2749
• /
• 2009

There have been many researches to detect and recover from faults on smart home environment, because these faults should lower its reliability. while, most of these researches have addressed functional defects of devices or software malfunction, few attempts have been made to deal with faults which may occur due to the inter relationships among devices. In this paper, we define the relationships among devices as rules, and propose a method for generating fault diagnosis knowledge which defines the symptoms and causes of faults. We classify the contexts of devices into two sets, depending on whether it satisfies the rules or not. when this method is applied to smart home environment, it is feasible not only to detect faults that may occur due to the relationships among devices but to identify their causes at real time.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2013.05a
• /
• pp.947-949
• /
• 2013

개인 휴대단말기로부터 측정된 생체정보 데이터가 PHR에 데이터베이스화되기 위해서는 응용 계층 표준 프로토콜인 HL7 CDA 표준에 따라야 한다. 하지만 국제 표준 HL7 CDA는 병원 시스템 간 의료정보 전달을 위한 프로토콜이기 때문에 개인 건강 기기로부터 측정된 생체 정보가 IEEE 11073 PHD 표준에 준하여 전달하더라도 HL7 CDA 프로토콜과 연동될 수 없다. 즉, 모바일 단말기 기반의 u-헬스케어 모니터링 서비스를 위해서는 IEEE 11073 PHD와 HL7 CDA 간 메시지 변환 게이트웨이가 필요하다. 이에 본 논문에서는 개인 휴대단말기를 통해 원격지에 있는 의료진이 사용자의 생체데이터를 실시간 관리하기 위해 ISO/IEEE 11073과 HL7 CDA 간 메시지 변환 게이트웨이 및 HL7 기반 진단지원시스템을 설계하였다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2011.04a
• /
• pp.1093-1096
• /
• 2011

현대 의료 분야는 질병의 진단과 치료뿐만 아니라 질병의 예방 및 건강증진을 위한 관리, 유지의 역할도 중요하게 대두되고 있다. 즉, 질병의 조기 발견과 진단으로 예방 및 관리를 생활화하고 건강수준을 높이는 방향을 제시하는 등 건강증진을 유도하는 계기를 증대시키고 있다. 따라서 본 논문에서는 간질환이 음성에 미치는 영향을 연구하기 위해 간 질환자를 대상으로 공명강과 발성의 변화를 측정하는 실험을 수행하였다. 이를 위해 간 질환자를 피실험자 집단으로 구성하여 간질환으로 인해 입원했을 때와 치료 후에 퇴원했을 때의 음성을 각각 수집하여 음성 분석 요소 중 제3포먼트 주파수 대역폭과 무성음 추출 패턴수를 측정하여 간 질환으로 인해 공명강과 발성에 미치는 영향을 분석하는 연구를 수행하였다.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.13 no.3
• /
• pp.555-560
• /
• 2018

In this paper, we focus on the study of educational contents using real vehicle based electric vehicle diagnosis system. To understand the electric vehicle, we describe the driving modes and operating principles of the core components and electric vehicles that make up the electric vehicles. In addition, we implemented a diagnostic system for analyzing the characteristics of the electric vehicle test bed and analyzed the characteristics of the vehicle based on the driving mode.

• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.724-725
• /
• 2011

현재 전력설비는 디지털 변전소 국제 표준 통신 규격인 IEC61850을 채택하고 있는 추세에 있으며, 온라인 GIS (Gas Insulated Switchgear) 예방진단 시스템의 고객 요구 사양도 IEC61850을 이용하여 외부 인터페이스가 가능한 구조를 포함하고 있다. 본 연구에서는 온라인 GIS 예방진단 시스템에 대한 IEC61850 모델을 제시하고 Logical Node를 구성하였다. 부분방전 데이터를 비롯한 실시간 감시 데이터는 IEC61850의 fixed report 기능으로 구현하였고, 부분방전 이벤트 및 이력 정보는 파일로 저장하여 IEC61850의 file transfer 기능으로 구현하였다. 기능 검증을 위하여 온라인 GIS 예방진단 시스템 서버에 IEC61850 서버 기능을 탑재하였고 상용의 IEC61850 클라이언트 소프트웨어를 이용하여 데이터 통신 및 파일 전송 기능을 확인하였다

• Proceedings of the KIPE Conference
• /
• 2011.07a
• /
• pp.415-416
• /
• 2011

본 논문은 계통연계형 전력변환 장치의 폐루프 제어에 이용되는 전류센서의 고장진단 및 허용운전 기법을 제안한다. 전류 센서에 고장이 발생하면, 정확한 출력전력제어가 불가능해져 품질이 저하될 뿐만 아니라 이에 대한 허용운전이 이루어지지 않으면 전체시스템의 운전을 중지해야 한다. 따라서 실시간 고장진단 및 허용운전 기법이 필요하다. 제안한 기법은 측정된 값과 추정 값의 비교를 통해 고장진단을 하고, 고장발생시 정상 센서에서 측정된 전류 값을 이용하여 허용운전을 한다. 10kW급 3병렬 전력 변환 시스템을 모의한 시뮬레이션을 통해 제안한 기법의 성능을 검증하였다.