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- 저자 : 이상욱(Lee, Sang-Uk) (검색결과 1,479 건)
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이상욱,남효덕,류정탁,김연보,Lee, Sang-Wook,Nam, Hyo-Duk,Ryu, Jeong-Tag,Kim, Yeon-Bo 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.8
We have investigated on the development of 2-2 mode piezocomposites that have better piezoelectric activity and lower acoustic impedance than those of conventional piezoceramics. In this study, we have investigated the electrical properties and acoustic impedance of 2-2 mode piezocomposite which were fabricated using the dice-and-fill technique for the different volume fractions of PZT The volume shrinkage of polymer is an important factor in 2-2 mode piezocomposites fabrication. The thickness mode electromechanical coupling factor($\kappa_t$) of PZT was compared with that of piezocomposites. It was shown that the 2-2 mode piezocomposites were much better than the PZT only. The acoustic impedance of 2-2 mode piezocomposites decreased linearly when PZT volume fraction was decreased.
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모바일 환경을 위한 맞춤형 서비스 유비쿼터스 영상전송 시스템의 설계
이상욱,안용범,김응수,Lee, Sang-Wook,Ahn, Yong-Beom,Kim, Eung-Soo 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.4
영상전송에 있어서 주변 환경에 대한 영상인식은 대단히 중요하다. 최근 정보인프라의 대중화에 따라 모바일 환경에까지 유, 무선을 통한 대상의 상태를 영상으로 확인하려는 사용자 중심적 욕구가 증가하였다. 하지만 기존의 모바일용 솔루션은 저대역폭을 가지는 모바일 단말기 기반의 네트워크 특성상 소프트웨어 코덱만을 지원함으로써 소프트웨어적인 처리의 한계로 인한 고화질의 영상은 기대 할 수 없었다. 이러한 단점을 해결하기 위해서 본 논문에서는 모바일 환경에서 적용할 수 있는 고화질 지원과 실시간적 요소를 고려하여 높은 압축률을 가지는 국제비디오 압축 표준인 MPEG-4 기반 하드웨어 코덱 설계에 관하여 기술하였다. 이를 위한 시스템의 최적화된 설계를 위하여 임베디드용 전용 CPU를 채용하였으며 구현된 시스템은 모바일 환경에서도 고기능을 서비스하고 전송속도 및 해상도 등에 있어서 우수한 성능을 나타내었다. An image recognition for surrounding conditions is very important in image transmission. In recently rears, as the information infrastructure is more general, the user-centered demands in which they want to identify by object's states image using wire or wireless environment have increased. However, existing mobile solution could be hard to expect high quality mage, because limitation of software processing according as network based on mobile terminal which has low band width supports software codec. To solve this weak point, this paper describes on hardware codec design based on MPEG-4 which is international video compression standard. Implemented system contains the embedded CPU for optimized design and it works high quality service as transmission speed and resolution in mobile circumstance.
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이상욱,유준규,변우진,Lee, S.,Ryu, J.G.,Byun, W.J. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.4
Navigation satellite systems (GPS, GLONASS etc.) provide three main services, i.e., positioning for location based services, navigation for multi-modal transportation services, and timing for communication and critical infrastructure services. They were started as military systems but were extended to civil service. Navigation satellite navigation system began with GPS in the USA and GLONASS in Russia at nearly the same time. Indian NavIC and Chines BDS announced their FOCs in 2016 and 2020, respectively and European Galileo and Japanese QZSS are catching up others. In these days, Navigation Satellite System, Positioning, Navigation, and Timing services are part of our daily life very closely. They are required for autonomous driving car, Unmanned vehicles like UAV, UGV, and UMV, 5G/6G telecommunications, world financial system, power system, survey, agriculture, and so on. The services among navigation satellite systems are very competitive and also cooperative one another. This article describes the status of these systems and evolution in the technical and service senses, which may be helpful for planning korea positioning system(KPS).
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조현병 환자의 동반 만성신체질환 현황 및 총 의료비용에 관한 연구
이상욱,이예린,오인환,유빈,구애진,김유석,Lee, Sang-Uk,Lee, Ye-rin,Oh, In-Hwan,Ryu, Vin,Goo, Ae-Jin,Kim, You-Seok 한국정신신체의학회 2018 정신신체의학 Vol.26 No.1
연구목적 본 연구에서는 조현병 환자의 만성신체질환 유병현황을 확인하고, 총 의료비용에 미치는 영향을 제시하고자 하였다. 방 법 2014~2015년 건강보험심사평가원 자료를 활용하였으며, 자료의 정확성을 높이기 위하여 조현병 및 만성신체질환은 주/부상병으로 동일 상병을 3회이상 진단받은 경우만 해당 질환으로 분류하였다. 총 의료비용은 보건의료체계적 관점으로 보험자의 비용과 함께 본인부담비용을 포함하였다. 결 과 조현병 환자의 24.5%는 1개, 17.3%는 2개, 23.4%는 3개이상의 만성신체질환을 가지고 있는 것으로 나타났으며, 만성신체질환의 1~5순위는 만성위염/위식도역류질환이 27.3%, 알레르기가 19.5%, 고혈압이 13.2%, 만성요통이 11.0%, 당뇨병이 10.6%로 위장간질환 및 알레르기 질환, 대사성 질환뿐만 아니라 근골격계 질환의 유병률도 높게 나타났다. 2014년에 진단받은 조현병 환자의 2015년 총 의료비용은 약 1조 8백억원이었으며, 총 의료비용에 영향을 미치는 요인으로는 성별, 연령, 만성신체질환의 수, 건강보험여부로 나타났다. 결 론 조현병 환자의 만성신체질환의 문제를 해결하기 위한 접근방법은 단순히 개별 질환을 중심으로 치료하기 보다는 조현병 환자의 다양한 신체 질환을 동시에 치료 및 관리할 수 있는 새로운 형태의 진료체계에 대한 모델 개발이 필요할 것이다. Objectives : This study tried to explore the prevalence of chronic physical diseases in patients with schizophrenia and its effects on total medical costs. Methods : The Health Insurance Review and Assessment Service data in 2014-2015 was employed. Only the injuries and diseases, identically diagnosed 3 times or more as a major or minor injury and disease, were classified into chronic physical diseases to improve data accuracy. Total medical costs included out-of-pocket and insurer's costs from health care system perspective. Results : It was shown that 24.5%, 17.3% and 23.4% of schizophrenia patients had one, two and three or more chronic physical diseases, respectively. There was a high prevalence of not only metabolic, but also musculoskeletal, diseases in those patients. The amount of 2015 total medical costs of patients with schizophrenia in 2014 was about 1.08 trillion won. The factors affecting the costs included sex, age, number of chronic physical diseases, and health insurance status. Conclusions : It is considered that clinical practice guidelines based on personal diseases may not sufficiently solve the problems for comorbidities in schizophrenia patients. Accordingly, it should be required to develop models for new types of medical systems capable of treating and caring varied illnesses at the same time.
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이상욱,고상봉,신민철,이병관,Lee, Sang-Wook,Koh, Sang-Bong,Shin, Min-Cheul,Lee, Byoung-Kwan 대한족부족관절학회 2004 대한족부족관절학회지 Vol.8 No.1
Purpose: The aim of this study was to investigate the usefulness of mortise angle and fibular length measured in radiologic findings in predicting the ankle stability. Materials and Methods: One hundred cases fifty cases were randomly selected volunteers with normal ankle function and the other fifty cases were randomly selected patients whose ankle were treated in our hospital and who were followed for over 1 years with good results. A specific experimental fixture were made to get the even AP and lateral view and objective stress view. Results: The mortise angle and fibular length was not statistically significant to the degree of talar tilt angle under valgus or varus stress and that of displacement under anterior or posterior stress. Conclusion: The mortise angle and fibular length was not the objective predicting factors on the ankle stability. Maintenance of constrained talus in dynamic status is most important factors in determining the ankle stability.
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