• 한국방사선학회논문지
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• 제17권7호
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• pp.1139-1147
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• 2023

본 논문에서는 소형 크기인 SiPM Sensor를 휴대용 검출기 내부에 적용하여 환자 피폭을 최소화하면서도 최적의 이미지 획득을 위한 선량을 제어하기 위한 방법을 제시하고 이에 대한 성능을 평가하는 것을 목적으로 한다. 휴대용 검출기는 환자의 위치에 빠르게 접근하여 신속한 진단을 가능하게 하는 장점이 있지만 이러한 이동성은 선량 관리의 어려움을 동반한다. X-ray imaging devices 국제 표준인 IEC62220-1-1 기준의 이미지 평가를 통해 검출기의 DQE와 최적 화질을 갖을 수 있는 선량을 확인하고 영상의 ADU와 SiPM Sensor의 출력을 매칭 하여 최적 선량을 확인하는 방법을 제시하였다. 검출기 제조사 기준 선량과 최적 선량 구현으로 획득된 Skull AP 이미지는 제조사 기준 342.8 µGy, 최적 제어 선량은 148.3 µGy로 조사되어 제조사 기준 선량 대비 57 %, Chest AP는 제조사 기준 81.9 µGy, 제어된 최적 선량은 27.9 µGy로 66 %의 높은 선량 감소 효과가 확인되었다. 또한 촬영된 두 영상은 방사선사 5명의 분석을 통해 해부학적 구조물을 판별하기에 임상적으로 유의미한 차이가 없는 것으로 확인되었다.

• Journal of Mechanical Science and Technology
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• 제17권12호
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• pp.2099-2106
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• 2003

In this paper, a novel fast response NDIR analyzer (FRNDIR), which uses an electrically pulsed semiconductor emitter and dual type PbSe detector for the PPM-level detection of carbon dioxide (CO$_2$) at a wavelength of 4.28 $\mu\textrm{m}$, is described. Modulation of conventional NDIR energy typically occurs at 1 to 20 Hz. To achieve real time high-speed measurement, the new analyzer employs a semiconductor light emitter that can be modulated by electrical chopping. Updated measurements are obtained every one millisecond. The detector has two independent lead selenide (PbSe) with IR band pass filters. Both the emitter accuracy and the detector sensitivity are increased by thermoelectric cooling of up to -20 degrees C in all semiconductor devices. Here we report the use of semiconductor devices to achieve improved performance such that these devices have potential application to CO$_2$ gas measurement and, in particular, the measurement of fast response CO$_2$ concentration at millisecond level.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.827-830
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• 2006

With recent advanced in portable electric devices, wireless sensor, MEMS and bio-Mechanics device, the new typed power supply, not conventional battery but self-powered energy source is needed. Particularly, the system that harvests from their environments are interests for use in self powered devices. For very low powered devices, environmental energy may be enough to use power source. In the generality of cases, these energy harvesting systems are used in the piezoelectric materials as mechanisms to convert mechanical vibration energy into electric energy. Through the piezoelectric materials, the ambient vibration energy could be used to prolong the power supply or in the ideal case provide endless energy f9r the devices. Therefore, the piezoelectric power harvesting cantilever beam is developed. Also, the output voltage and power are predicted in this study. We also discuss the developing system of the piezoelectric energy scavenger. An experimental verification of the model is also performed to ensure its accuracy.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(1)
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• pp.109-112
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• 2000

The desire of achieving abundant and various information in Web-sites through portable devices is increased as the mobile communication technology is matured. WML(Wireless Markup Language) is the fundamental language to fill up the those desires. The number of commercial WML sites which can be accessed by PCS(Personal Communication System) over the Internet are growing rapidly worldwide. In this paper, a WML authoring tool which can author easily the homepage suitable for PCS is designed and implemented. The usability of the proposed WML authoring tool was confirmed by using UP.SDK simulator over the Internet.

• 전기화학회지
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• 제17권3호
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• pp.139-148
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• 2014

Electrochemical energy-storage devices such as batteries and supercapacitors are important components in emerging portable electronic device, electric vehicle, and clean energy storage and supply technologies. This review describes recent progress in the development of nanostructured electrodes, the main component of the electrochemical energy-storage device, prepared by layer-by-layer (LbL) electrostatic assembly. Major advantages associated with, and challenges to, the fabrication of LbL electrodes, as well as the future outlook for expanding the application of LbL techniques, are discussed.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1543-1548
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• 2008

Ubiquitous technology is the trend towards increasingly ubiquitous, connected computing devices in the environment, a trend being brought about by a convergence of advanced electronic - and particularly, wireless - technologies and the internet. Ubiquitous technology is pervasive in nature and unobtrusively embedded in the environment, completely connected, intuitive, effortlessly portable, and constantly available. The object of this paper is to describe the strategy plan for Ubiquitous-Urban Transit Total Information System.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.298-298
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• 2009

Touch screen using in portable devices is expanding continuously, has become particularly strong in mobile phones. These trends are able to open the "New Horizon" which refers the design and usability of mobile phones and provide "New Experience" which users have never been experienced on mobile phones. This research argues new usability issues and important points which can be occurred in touch based mobile phones as user experience point of view.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(5)
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• pp.107-110
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• 2001

The capacitive idling SEPIC(Single Ended primary Inductance Converter) is derived from the SEPIC topology. This converter is suitable for maximizing Li-Ion battery life in portable equipments. Besides, that makes it possible to increase the switching frequency without a additional circuitry This paper is presented the characteristics of the capacitive idling SEPIC and experimental waveforms of the devices in continuous current mode.

• 한국콘텐츠학회논문지
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• 제18권11호
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• pp.462-474
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• 2018

생체 감지기술 발달은 그동안 거대한 전문 의료기기에서만 가능했던 다양한 생체 정보 수집을 간편하게 가능케 하였다. 센서 소형화는 진단기기의 휴대성을 높여 기존에 병원에 직접 가서 해야만 했던 다양한 건강 진단을 생활 속에서 간편히 수행할 수 있게 하였다. 스마트폰 같은 휴대기기에 센서를 결합하거나, 첨단 IOT(Internet of Things, 사물인터넷) 기술을 적용해 체내 삽입형, 혹은 부착 가능한 초소형 모듈 등 의료기기의 새로운 폼팩터를 만들어냈다. 또한, 측정결과를 스마트폰 등 휴대용 정보기기를 통해 즉시 확인할 수도 있다. 아직 국내에서는 상용화가 더디게 이루어지고 있지만, 미국 등 원격의료 서비스를 허용한 나라에서는 이 분야에서 다양한 양상으로 신기술 적용이 이루어지고 있다. 세계적으로 가장 빠르게 고령화가 진행 중인 대한민국에서 의료수요, 공급, 그리고 비용 문제는 점점 커지고 있다. 이런 상황에서 새로운 건강관리 개념인 스마트 헬스케어가 기존의 의료체계를 보완할 수 있을지 크게 주목받고 있다. 본 연구는 스마트 헬스케어와 관련된 기술 동향을 확인하고, 다양한 헬스케어 제품을 UX 디자인적 측면에서 유형화하였다. 또한, 스마트 헬스케어 기술을 대상 사용자인 노인에게 적용하기 위한 UX 디자인 접근방법과 지침을 제시하였다. 본 연구가 새로운 사회적 문제인 고령사회 헬스케어 문제 해결에 돌파구가 될 UX 디자인 분야의 기반자료가 되기를 기대한다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.127-130
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• 2007

The increased availability of portable, low-cost, high resolution video devices has resulted in a rapid growth of the applications for video sequences. These video devices can be mounted in handhold unit, mobile unit and airborne platforms like maned or unmaned helicopter, plane, airship, etc. A core technique in use of video sequences is to align neighborhood video frames to each other or to reference images. For video sequences registration, we extracted interested points from aerial video sequences using Harris, $F{\square}rstner$, and KLT operators and implemented image matching using these points. As the result, we analysed image matching results for each operators and evaluated accuracy of aerial video registration.