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Yoo, Kwangho,Kim, Suji,Han, Narae,Kim, Ga Eun,Shin, Min Jae,Shin, Jae Sup,Kim, Min Applied Science Publishers 2018 Dyes and pigments Vol.149 No.-
<P><B>Abstract</B></P> <P>A reversible red-yellow color change in PDA (polydiacetylene) was achieved by controlling the head group of the diacetylene molecules. Typical PDAs show blue-red color transitions, and this reversible red-yellow color transition could be applied to various sensing applications. The introduction of an alkyl substituent to the head group as an internal stimulus resulted in a primary blue-red color change, and this change became clearer as the length of the alkyl chain became longer. The PDA vesicle, once colored red in response to an internal stimulus, showed a reversible and very selective red-yellow color change in response to a second external stimulus, such as temperature or pH.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A reversible red-yellow color transition of PDAs was achieved by alkyl chain induced PCDA-Oct. </LI> <LI> Stepwise blue-red-yellow color changes are suggested through internal and external stimuli. </LI> <LI> Both temperature and pH sensing were successfully performed using modified PCDA-Oct. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Development of a MEMS-based Acceleration Sensing Module for Electronic Stability Program
Kwangho Yoo,Minha Park 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes our development work for acceleration sensing modules for electronic stability program (ESP) systems. The MEMS-based accelerometer is fabricated using the unique sacrificial/bulk micromachining (SBM) process by us. The sensing module is designed to measure low level accelerations accurately and be stable in an automotive environment. This paper describes the accelerometer design and fabrication, electronic circuits and PCB design, module assembly, and performances of the developed sensing module. The developed sensing module offers analog voltage output with ±1.5g dynamic range, 0.05% non-linearity, 0.2mG resolution and l295㎷/g scale factor. The module includes a CAN2.0A interface and yields good experimental performances when implemented on a CAN test server.
차량용 고 분해능 디지털 MEMS 가속도센서 시스템 IC 개발
유광호(Kwangho Yoo),고형호(Hyoungho Ko),이아라(Ahra Lee),임재상(Jaesang Lim),이상윤(Sang-Yoon Lee),정덕균(Deog-Kyoon Jeong),박민하(Minha Park),장현수(Hyunsu Jang),이정표(Jeongpyo Lee),조동일(Dong-il Dan Cho) 한국자동차공학회 2006 한국자동차공학회 Symposium Vol.- No.-
This paper presents design, fabrication and measurement of a high resolution digital microelectromechanical systems (MEMS) accelerometer system IC. This system IC consists of a MEMS sensing element and a high resolution digital readout circuit. The MEMS sensing element is fabricated using the sacrificial/bulk micromachining (SBM) process. In order to protect the sensing element from environmental changes, wafer level hermetic packaging(WLHP) process is performed. The developed readout circuit offers 32-bit resolution using an 1-bit, 4th-order ΣΔ modulator and a digital decimator/demodulator. The proposed system IC provides a 128-㎐, 32-bit digital output with ±5g dynamic range, 0.52% nonlinearity, and 1.6*10? count/g scale factor.
전동식 파워스티어링 용 전자기유도 방식 토크센서 개발에 관한 연구
유광호(Kwangho Yoo),서정욱(Jungwook Seo),반재원(Jaewon Ban),김완일(Wanil Kim),Manfred Bartscht,장현섭(Hyunsup Jang),권도욱(Dowook Kwon),한상휘(Sangwhi Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, we will present an inductive torque sensor development which could be preferably used in EPS systems. This torques sensor has capability of both input and output side rotary positions sensing with resolution of 0.005deg/0.01deg respectively. Differential angle between two rotating shaft linked by a torsion-bar can be calculated simply using two angle signals by the ECU. Digital output protocol “SENT” interface applied to strengthen noise performance in an automotive environment and diagnosis capability. For redundancy, the torque sensor consists of two sensors which can independently measure both input shaft and output shaft angles. The two sensors are electrically isolated from each other with their own power supply, ASIC, excitation and receiver coils. That means altogether four angles are measured whereby two angles are transmitted via each SENT signal line. This redundancy allows the ECU to crosscheck the signals to be able to detect faults inside the sensor or the wiring harness. Due to its both side angle measurement principle, the most critical performance parameter is a ripple which means output variation with 0-torque input during 360deg rotation. And the ripple parameter can be understood as superposition of offset error, low frequency ripple(LFR), high frequency ripple(HFR) and random noise. Averaged ripple measured from the developed sensors are to be 0.002deg offset, 0.032deg LFR, 0.010deg HFR, which are sufficiently acceptable for stable control of EPS system and good feeling for drivers.
Safeguards Distinction in Water-Cooled SMRs
Kwangho Ju,Seungho Jeong,Hosik Yoo 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
Small modular reactors (SMRs) are getting attention as an alternative to fossil fuel power stations due to versatile application and carbon dioxide reduction. Although various types of advanced reactors are being developed, water-cooled SMR will be first deployed on a commercial scale. The International Atomic Energy Agency (IAEA) and regulatory bodies are trying to identify safeguards issues of water-cooled SMRs as the first priority. IAEA begins to develop a safeguards plan by asking for the facility’s specification in a given format, a design information questionnaire (DIQ). Then, IAEA periodically performs safeguards activities such as design information verification (DIV) and physical inventory verification (PIV). In this sense, we utilize research and power reactor DIQ for water-cooled SMRs (NuScale, SMART, i-SMR and KLT-40S). Most of the questions are answered with open information. For undisclosed answers, pressurized water reactor (PWR) features are described. Safeguards issues in water-cooled SMR originate from core modularization. As the nuclear material flows are diversified, the number of safeguards measure will be increased while staff are reduced in SMRs. Instrumentation for safeguards should be developed to reduce worker’s fatigue level. Intensive arrangement of fuel assemblies may also need unique devices to secure their visibility or detectability. A transparent floor with a surveillance system or advanced Cherenkov viewing device may be adopted to enhance containment and surveillance. Meanwhile, some questions could be more elaborate regarding safeguards. First, question #38 cannot confirm the time of occurrence of weapon-grade plutonium for reactor operation. Second, the answers in questions #46 and #49 are primitive to identify a place to generate an undeclared fissile material. Therefore, the current DIQ should be revised to get a detailed burnup report and spatial distribution of neutron flux.
송광호(Kwangho Song),민지홍(Jihong Min),김유성(Yoo-sung Kim) 한국정보과학회 2015 정보과학회 컴퓨팅의 실제 논문지 Vol.21 No.10
약 본 논문에서는 작성중인 기술문서에 대해 기존 문서 데이터베이스내의 원본문서들과 유사도를 비교하여 일정기준 이상의 유사성을 갖는 문장을 포함하는 원본문서들의 서지정보를 모아 참고문헌 목록을 자동으로 작성해 주며 대상 문서의 해당 문장에는 참고문헌 인용부호를 부착할 수 있도록 지원하는 시스템을 소개한다. 또한 이러한 제안 내용을 토대로 하여 웹기반 시범 서비스 모델을 설계하고 이를 온라인 서비스로 실현하기 위한 프로토타입 시스템을 개발하였다. 개발된 시스템을 활용하여 기술문서 작성자에게 작성중인 기술문서에 대해 기 발표된 원본문서내의 유사 문장을 검색하고 이에 대한 참고문헌 인용부호를 부착할 수 있도록 지원함으로써 표절 문제를 선제적으로 예방하고 나아가 참고문헌 목록 생성 및 인용부호 자동부착 지원기능을 통해 논문 저술에 편리성을 확보할 수 있을 것이라 기대한다. In this paper, the design and implementation of an automatic reference-citation-mark attachment system are introduced. The system automatically attaches a citation mark to the end of a sentence in a technical document if the corresponding statement has a high similarity to another statement in the same document; simultaneously, the corresponding bibliographic data is automatically created from the cited-document information. In accordance with functional specifications, a Web-based, online service model and the development of its prototype system are proposed. The developed system can help in the elimination of unexpected plagiarism issues, and will alleviate the burdens of reference citation and reference-list creation for technical writers.
4차 산업혁명의 관점에서 제품수명주기관리의 지식영역 적용도 분석
허광호 ( Kwangho Heo ),이유미 ( Youmi Lee ),유영진 ( Young-jin Yoo ),김진회 ( Jin-hoi Kim ),오유상 ( You-sang Oh ),김인재 ( Injai Kim ) 한국지식경영학회 2021 지식경영연구 Vol.22 No.2
제품수명주기관리(Product Lifecycle Management)는 8개의 지식영역으로 구성된 잘 정의된 관리방법이다. 4차 산업혁명이 스마트 팩토리와 밀접한 관련이 있기 때문에 궁극적으로 제품의 아이디어 생성에서 폐기까지의 전 과정을 효과적으로 관리하는 제품수명주기관리의 중요성이 부각되고 있다. 본 연구는 제품수명주기관리 분야의 전문가를 대상으로 제품수명주기관리의 지식영역의 현재와 향후 적용정도를 4차 산업혁명의 관점에서 분석하였다. 제품수명주기관리의 지식영역이 현장에서 어느 정도 적용되고 있는지를 현재의 관점과 가까운 미래의 관점에서 전문가 인식을 분석하였다. 제품수명주기관리의 지식영역의 현재 및 미래의 적용정도를 분석하고, 적용정도의 관점에서 지식영역 간의 차이가 있는지를 분석하였다. 분석된 결과를 중심으로 그 의미와 향후 흐름을 제시하였다. Product Lifecycle Management is a well-defined management method consisting of 8 knowledge areas. Since the 4th industrial revolution is closely related to smart factories, the importance of product lifecycle management, which effectively manages the entire process from product idea generation to disposal, is emerging. This study analyzed the current and future applications of the knowledge domain of product life cycle management from the perspective of the 4th industrial revolution for experts in the field of product life cycle management. The expert's perception was analyzed from the current point of view and the future point of view to see how the product life cycle management knowledge area is applied in the field. The current and future application degree of the knowledge domain of product life cycle management was analyzed, and whether there was a difference between the knowledge domains in terms of the level of application was analyzed. Based on the analyzed results, its meaning and future flow are presented.