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경도 치매와 노인성 우울의 변별을 위한 시계 그리기 검사의 효율성
허정일,이형영,윤진상,국승희 한국임상심리학회 2004 Korean Journal of Clinical Psychology Vol.23 No.1
The purpose of this study was to examine the efficiency of the Clock Drawing Test(CDT) for differentiating mild dementia from geriatric depression and normal elderly person. The CDT was administered to 25 patients with clinically diagnosed mild dementia, 25 with geriatric depression and 25 normal control and these groups were similar in age, education and gender. The cut-off scores, efficiencies, sensitivities, specificities, positive likelihood ratio and negative likelihood ratio of each group were calculated and then the analysis of error type was conducted. CDT significantly discriminated mild dementia patients from geriatric depression patients or normal controls but could not discriminate geriatric depression patients from normal controls. In the error type analysis of clock drawing, 'stimulus bound response', 'conceptual error' and 'spatial and planning error' were more frequent in patients with mild dementia than in normal controls or in geriatric depression patients. Finally, the suggestions, limitations and further issues for future study were discussed.
IEEE 1451 기반의 Wireless Smart Sensor Node와 NCAP 시스템의 제안과 구현
허정일,임수영,서정호,김우식 대한전자공학회 2007 電子工學會論文誌-CI (Computer and Information) Vol.44 No.5
IEEE 1451 standard defines an interface for network and transducer. In this paper, We propose an architectural model to configure data acquisition system and wireless smart sensor node based on IEEE 1451 standard. Proposed Network Capable Application Processor(NCAP) supports the task of data acquisition and communication for smart sensor node and network. The NCAP is able to reconfigure without interrupting the functionality of the wireless sensor node and receives the critical information of transducer using the DB. Smart sensor node is able to provide the basic information of sensor in digital format. This digital format is called Transducer Electronic Data Sheet(TEDS), is capable of plug-and-play capability of wireless sensor node and the NCAP. We simplify the format of TEDS and template to apply to wireless network environment. Information of TEDS and template is transmitted using ad-hoc routing. This study system uses body temperature sensor and ECG(Electrocardiogram) sensor to provide the medical information service. The format of template is selected by data sheet of the sensor and reconfigured to accurately describe the property of the sensor. DB of NCAP is possible to register new template and information of the property as developing new sensor. IEEE 1451 standard는 네트워크와 transducer간에 표준 interface를 정의한다. 본 논문에서는 IEEE 1451 Standard 기반의 data acquisition system과 무선 smart sensor node를 구성하기 위한 구조적인 모델을 제안한다. 제안 된 Network Capable Application Processor(NCAP)은 data acquisition의 역할과 smart sensor node와 네트워크 사이에 가교 역할을 한다. 또한 무선 sensor node에게 영향을 주지 않으면서 재구성이 가능하고 DB를 이용하여 transducer의 정확한 정보를 얻는다. Smart sensor node는 그 자신에 관한 기본적인 정보를 디지털 형식으로 제공하는 능력을 가지고 있다. 이 디지털 형식은 Transducer Electronic Data Sheet(TEDS)라 하며 sensor node의 plug-and-play 기능을 가능하게 한다. IEEE 1451.4에서 정의하고 있는 TEDS와 Template를 무선 환경에서 적용하기 위해 형식을 간략화 하였으며 ad-hoc routing을 통해 전송이 이루어진다. 본 연구 시스템은 의료정보 서비스를 제공하기 위한 목적으로 체온과 ECG(Electrocardiogram) 센서를 사용하였다. Template 형식은 센서들의 data sheet를 통해 결정하였으며 센서의 특징을 정확히 표현하기 위해 재구성하였다. NCAP의 DB는 다양한 센서 개발에 따라 새로운 Template 및 하부 항목의 등록이 가능하도록 구현하였다.
IEEE 1451 기반의 Smart Sensor에 관한 연구
허정일(Jung-Il Heo),임수영(Su-Young Lim),서정호(Jung-Ho Seo),안진수(Jin-Soo Ahn),김우식(Woo-Shik Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
The IEEE 1451 standard defines an interface for network and transducer. Template which is a structure designed for sensor information search can be used to provide the fixed number of items and prepare patterns according to type of sensor. In this paper, We implemented of XML-based sensor information Template. Sensor information is used as a shared information in monitoring systems.
24kV급 배전반의 외함재질과 두께에 따른 Bus bar와 외함의 전자기 손실특성 분석
허정일(Jeong Il Heo),홍종기(Jonggi Hong),강형구(Hyoungku Kang) 대한전기학회 2013 전기학회논문지 P Vol.62 No.4
This paper deals with the electromagnetic loss characteristics of enclosures for a 24kV high voltage switchgear by using a finite element method (FEM). A study on the electromagnetic characteristics of enclosures for a high voltage switchgear should be conducted to minimize the size and the temperature rising of a switchgear. Generally, the enclosures made by stainless steel are used to minimize the eddy current loss caused by the transporting current in Bus bars due to its non-magnetic characteristics although the price of stainless steel is expensive compared with other metal for enclosures. Therefore, a switchgear made by stainless steel enclosures could be fabricated as a small size and are applied to a switchgear in urban substations. On the contrary, the switchgear enclosures made by steel could be fabricated with relatively cheap manufacturing price. However, the temperature easily rises due to the transporting current in Bus bars because steel is a ferromagnetic material. Therefore, the size of a switchgear made by steel enclosures is relatively massive and installed in rural substations. In this paper, the electromagnetic losses in the enclosures of a switchgear according to various enclosure thicknesses are calculated and compared with each other. Especially, we proposed a hybrid type enclosures for a switchgear made by stainless steel (top and bottom enclosure) and steel (left and right enclosure). It is concluded that the cost electromagnetic performance of applying the hybrid type enclosure is favorable to develop a high voltage switchgear.
마이크로 채널 집적을 통한 카본 빗살무늬 나노전극 어레이 기반 전기화학 센서의 민감도 향상
허정일(Jeong-Il Heo),임영진(Yeongjin Lim),이병준(Byungjune Lee),신흥주(Heungjoo Shin) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this paper, a highly sensitive and simple electrochemical sensing platform which consists of carbon interdigitated array (IDA) nanoelectrodes integrated in a PDMS microchannel is introduced. In previous studies, the prospect of electrochemical sensors using carbon IDA nanoelectrodes capable of amplifying current signal by 29 times was demonstrated. This electrochemical signal amplification is based on redox cycling of redox species between the fingers of the IDA nanoelectrodes each of that experiences distinct redox reactions, that is reduction or oxidation depending on electrode potential. The redox cycling based signal amplification can be further enhanced by integrating a microchannel on top of the IDA nanoelectrodes. This is because the redox cycling effect is maintained steady while non-reversible species depletes faster as the microchannel size reduces. We present highly sensitive electrochemical sensors which have more than 2 order electrochemical signal amplification (>100) using only conventional soft lithography and carbon-MEMS process.