전자식 선박디젤엔진의 엔진제어기 개발/연구

심한섭(Han-Sub Sim),이민광(Min-Kwang Lee),이강윤(Kang-Yoon Lee) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.5

A control program of an engine control module (ECM) was developed, and its control performance was verified on a 750Ps marine diesel engine. The control method was designed for an engine rotational speed control system. For ECM hardware, the commercial rapid control prototype (RCP) ECM was used. The programming tool for control algorithm development was the MatLab/Simulink. The main control algorithm assembled many control models as engine cranking, run, and stall. Each model has sub-models to input/output control signals. The target engine speed was input signal from a speed control lever, and control output signal of the ECM was sent to the unit-injectors for fuel injection. The engine test was performed under various conditions of engine rotational speeds and dynamometer loads. The test results show that the control function of the ECM is suitable for electrical marine diesel engines.

관상동맥 스텐트 내 재협착의 발생에 미치는 임상적 관동맥 조영술적 요인들

윤혁준,김기식,박형섭,이영수,현대우,한성욱,허승호,김윤년,김권배,박남희,원경숙 대한순환기학회 2003 Korean Circulation Journal Vol.33 No.12

월 PMP 개념의 적용에 관한 연구

최한규,김남원,최용묵,윤희섭 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

Normally at a flood season the operation of the dam depends on a short range weather forecast that makes many difficulties of the management at a dry season. It is needed to study the pattern of the long period rainfall. The concept of PMP(Probable Maximum Precipitation) was used for designing dam. From the concept, this study is applied the concept of monthly probable maximum precipitation for operating dam. It can be possible to let us know the appropriateness of a limiting water level at a rainy season. For the operation of dam at a dry season this study can predict roughly the flood season's pattern of precipitation by month or period, therfore the prediction of precipitation can rise efficient operation of a dam.

뇌파의 비선형적 분석을 위한 Tool 개발

최윤정,한운섭,최경규 이화여자대학교 의과대학 2003 EMJ (Ewha medical journal) Vol.26 No.2

연구목적 : 본 연구는 비선형 동역학 이론을 이용하여 뇌파를 시공간적으로 분석해 내고 이를 지능형 시스템에 도입함으로써 새로운 진단시스템을 개발하는 것을 목적으로 한다. 방법: 최대 64 채널가지의 모든 뇌파에 대해 적용이 가능한 시스템을 구성하여 가장 기본적인 형태의 뇌파 샘플을 적용, 측정된 뇌파를 불러오고 전처리 과정을 통해 신호를 분석에 용이하게 가공하고 분석법의 특성에 따라 알맞은 분석법을 선택하여 분석하고 분석된 데이터는 후처리과정을 통해 그 패턴을 분류하는 단계의 프로그램을 만들고 비선형 동역학 이론을 이용하여 단계별 프로그램을 구성하였다. 결과: 컴퓨터 시스템에 사용하는 프로그램을 다음과 같은 다양한 요소로 구성하였다. 신호 발생부에는 Lorenz sys-tem과 Rossler system을 포함하였다. 신호 전처리 부에는 정량화, 밴드 패스 필터링, 잡음 추가, 미분, sutto-gating 과정을 포함하였다. 신호 분석 부에는 스펙트럼분석, 위상공간 분석, 상관 분석, 모드 분석을 포함하였다. 신호 후처리 부에는 setting layer, Learning procce-ssing and Making weight file, Classifier start with Test file을 포함하였다. 부가기능으로서 Copy&paste, Print, Save 기능을 포함하였고 운영 환경은 Windows 95/98/2000 또는 Windows NT를 사용하고 데이터 형식은 뇌파 채널 최대 64채널까지 가능(Neural Network Processing의 경우 8채널) 하며 아스키 파일로 열(co-lumn)의 수는 채널을 의미하고 행(row)은 샘플링되어 저장된 데이터를 의미하는 것으로 하였다. 결론: 뇌에서 발생하는 전기학적 신호를 실시간으로 손쉽게 분석하여 실제 진단에 이용할 수 있는 기본적인 컴퓨터 프로그램을 개발하였으며 이를 토대로 더욱 정교하고 객관적인 뇌파 분석 결과를 얻을 수 있는 상용 프로그램의 개발에 이용할 수 있을 것으로 생각한다. Objectives : EEG is a record of electronic signals of brain. If there are effective methods for analysis of EEG signal it can be used as a diagnostic tool for diseases related to brain function. We developed a new a basic computer program which was designed to analysis of pattern of EEG. For nalysis of pattern, EEG signal was processed by variable experimental analytical methods and grouped by common pattern. Results : Program was composed of multiple systems. Signal generating system was composed of Lorenz signal generation and Rossler signal generation parts. EEG processing system was com-posed of Normalization, Band pass filtering, First Second difference, Add random noise and Sur-rogate making parts. EEG analyses system was composed of Spectral analyses, Phase space analyses, Correlation analyses and Mode analyses parts. Pattern recognition and grouping system was com-posed of data format, Power spectrum, Neural network process and Classification parts. Conclusion : We developed a basic computer program for systemic analysis of EEG by Nonlinear analysis methods.

Versatile approaches to tune a nanocolumnar structure for optimized electrical properties of In₂O₃ based gas sensor

Han, Soo Deok,Noh, Myoung-Sub,Kim, Sangtae,Shim, Young-Seok,Song, Young Geuon,Lee, Kwangjae,Lee, Hae Ryung,Nahm, Sahn,Yoon, Seok-Jin,Kim, Jin-Sang,Kang, Chong-Yun Elsevier 2017 Sensors and actuators. B, Chemical Vol.248 No.-

<P><B>Abstract</B></P> <P>In this study, we demonstrate tuning of electrical properties and sensing responses of In<SUB>2</SUB>O<SUB>3</SUB> nanocolumnar structure via varying glancing angle (GLAD) deposition conditions by e-beam evaporator. The varied deposition conditions include glancing angle, vacuum level and deposition rate. The electrical property of In<SUB>2</SUB>O<SUB>3</SUB> nanostructured thin films, demonstrated by the base resistance, change up to 3 orders of magnitude from 110Ω to 103104Ω depending on the porosity of nanocolumnar structure and oxygen vacancy concentration. This variation in electrical property transfers to the tuning of gas sensing response, and we achieve tuning the same material (In<SUB>2</SUB>O<SUB>3</SUB>) based gas sensors to better perform for specific type of gases (either oxidizing or reducing). The highest responses achieved in this work reached up to 176 for oxidizing gases (5ppm NO<SUB>2</SUB>, R<SUB>gas</SUB>/R<SUB>air</SUB>) and 929 for reducing gases (50ppmC<SUB>2</SUB>H<SUB>5</SUB>OH, R<SUB>air</SUB>/R<SUB>gas</SUB>). Therefore, we demonstrate that gas sensors can be optimized for specific type of target gases with the same material, via simple control of deposition conditions. Along with the high reproduciblility and sensitivity, this puts the nanocolumnar thin film based gas sensors by GLAD with huge potential for further miniaturization and mass production, suitable for the upcoming IoT era.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanocolumnar In<SUB>2</SUB>O<SUB>3</SUB> thin film based gas sensor is fabricated by glancing angle deposition (GLAD). </LI> <LI> Electrical properties of In<SUB>2</SUB>O<SUB>3</SUB> can be optimized for specific target gases, tuning simple deposition conditions of GLAD. </LI> <LI> In<SUB>2</SUB>O<SUB>3</SUB> sensors have excellent performances with high repeatability, recovery, and extremely low detection limit. </LI> </UL> </P>

Ferroelectric Tunnel Junction for Dense Cross-Point Arrays

Lee, Hong-Sub,Han, Wooje,Chung, Hee-Yoon,Rozenberg, Marcelo,Kim, Kangsik,Lee, Zonghoon,Yeom, Geun Young,Park, Hyung-Ho American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.40

<P>Cross-point array (CPA) structure memories using a memristor are attracting a great deal of attention due to their high density integration with a 4<I>F</I><SUP>2</SUP> cell. However, a common significant drawback of the CPA configuration is crosstalk between cells. To date, the CPA structure using a redox-based memristor has restrictions to minimize the operating current level due to their resistive switching mechanism. This study demonstrates suitable characteristics of a ferroelectric tunnel junction (FTJ) for the memristor of the CPA structure using an electrostatic model. From the FTJ of the Au/<I>p</I>-type Pr<SUB>0.98</SUB>Ca<SUB>0.02</SUB>MnO<SUB>3</SUB> (4 nm)/ BaTiO<SUB>3</SUB> (4.3 nm)/<I>n</I>-type Ca<SUB>0.98</SUB>Pr<SUB>0.02</SUB>MnO<SUB>3</SUB> (3 nm)/ Pt(111) structure, which has a higher and thicker potential barrier, a good memristive effect for the CPA structure with a high nonlinear current–voltage curve and low current operation, was obtained by Δ Fowler–Nordheim tunneling with effectively blocked direct tunneling and thermionic emission. The FTJ demonstrated reduced sneak current and the possible for high nonlinearity.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-40/acsami.5b06117/production/images/medium/am-2015-06117d_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b06117'>ACS Electronic Supporting Info</A></P>

Tunable Bandgap Narrowing Induced by Controlled Molecular Thickness in 2D Mica Nanosheets

Kim, Sang Sub,Khai, Tran Van,Kulish, Vadym,Kim, Yoon-Hyun,Na, Han Gil,Katoch, Akash,Osada, Minoru,Wu, Ping,Kim, Hyoun Woo American Chemical Society 2015 Chemistry of materials Vol.27 No.12

<P>Bandgap engineering of atomically thin 2D crystals is critical for their applications in nanoelectronics, optoelectronics, and photonics. Here, we report a simple but rather unexpected approach for bandgap engineering of muscovite-type mica nanosheets (KAl<SUB>3</SUB>Si<SUB>3</SUB>O<SUB>10</SUB>(OH)<SUB>2</SUB>) via controlled molecular thickness. Through density functional calculations, we analyze electronic structures in 2D mica nanosheets and develop a general picture for tunable bandgap narrowing induced by controlled molecular thickness. From conducting atomic force microscopy, we observe an abnormal bandgap narrowing in 2D mica nanosheets, contrary to well-known quantum size effects. In mica nanosheets, decreasing the number of layers results in reduced bandgap energy from 7 to 2.5 eV, and the bilayer case exhibits a semiconducting nature with ∼2.5 eV. Structural modeling by transmission electron microscopy and density functional calculations reveal that this bandgap narrowing can be defined as a consequence of lattice relaxations as well as surface doping effects. These bandgap engineered 2D mica nanosheets open up an exciting opportunity for new physical properties in 2D materials and may find diverse applications in 2D electronic/optoelectronic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2015/cmatex.2015.27.issue-12/cm504802j/production/images/medium/cm-2014-04802j_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm504802j'>ACS Electronic Supporting Info</A></P>

Role of Additives on the Performance of CsPbI₃ Solar Cells

Heo, Do Yeon,Han, Sang Mok,Woo, Nam Sub,Kim, Young Ju,Kim, Tae-Yoon,Luo, Zhengtang,Kim, Soo Young American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.28

<P>The role of additives in the performance of CsPbI<SUB>3</SUB> perovskite solar cells (PSCs) was investigated. Different kinds of cations and anions were used as additives in a <I>N,N</I>-dimethylformamide (DMF) solution containing CsI and PbI<SUB>2</SUB> (1:1 molar ratio). These include HI, HBr, HCl, NH<SUB>4</SUB>I, NH<SUB>4</SUB>Br, and NH<SUB>4</SUB>Cl. Additive cations (H<SUP>+</SUP> and NH<SUB>4</SUB><SUP>+</SUP>) as well as halide ions (I<SUP>-</SUP>, Br<SUP>-</SUP>, and Cl<SUP>-</SUP>) are important for the properties of PSCs. Especially, the addition of iodine ion showed good characteristics compared to Br<SUP>-</SUP> and Cl<SUP>-</SUP>. Among the CsPbI<SUB>3</SUB> layers prepared with different kinds of additives and annealed at different temperatures, the X-ray diffraction peaks of CsPbI<SUB>3</SUB> were clearly found at 14° and 28° for the sample annealed at 150 °C with 50 μL of HI, suggesting the formation of a cubic structure at the low temperature of 150 °C. The field emission scanning electron microscopy images indicate that the surface of the perovskite layer with hydrogen halide additive (“H<SUP>+”</SUP>-based additive) is more uniform than that with ammonium additive. The roughness profiles determined by atomic force microscopy indicate that the CsPbI<SUB>3</SUB> film with HI additive shows the least roughness among the samples with H<SUP>+</SUP>-based additives. Therefore, the best power conversion efficiency (PCE) of 4.72% is obtained for CsPbI<SUB>3</SUB> PSCs annealed at 150 °C with HI (50 μL). The H<SUP>+</SUP>-based additives seem to react with PbI<SUB>2</SUB> in DMF solution, increasing the solubility of PbI<SUB>2</SUB> and thus lowering the processing temperature. Furthermore, the PCE of CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3-<I>x</I></SUB>Cl<SUB><I>x</I></SUB> PSCs decreased from 7.45 to 0.23%, whereas that of CsPbI<SUB>3</SUB> PSCs with 50 μL of HI only decreased from 3.55 to 2.78% after exposing the samples to air for 3 h. These results indicate that H<SUP>+</SUP>-based additives, especially HI, have more impact on the CsPbI<SUB>3</SUB> PSCs in terms of lowering the processing temperature and improving the performance.</P> [FIG OMISSION]</BR>

Bioelectrocatalytic detection of glycated hemoglobin (HbA_1c) based on the competitive binding of target and signaling glycoproteins to a boronate-modified surface

Song, Seung Yeon,Han, Yong Duk,Park, Yoo Min,Jeong, Chi Yong,Yang, Yong Ju,Kim, Moo Sub,Ku, Yunhee,Yoon, Hyun C. Elsevier 2012 Biosensors & bioelectronics Vol.35 No.1

<P><B>Abstract</B></P> <P>We developed an electrochemical glycated hemoglobin (HbA<SUB>1c</SUB>) biosensor for diagnosing diabetes in whole human blood based on the competitive binding reaction of glycated proteins. Until now, no studies have reported a simple and accurate electrochemical biosensor for the quantification of HbA<SUB>1c</SUB> in whole blood. This is because it is very difficult to correctly distinguish HbA<SUB>1c</SUB> from large amounts of hemoglobin and other components in whole blood. To detect glycated hemoglobin, we used electrodes modified with boronic acid, which forms a covalent bond between its diol group and the cis–diol group of the carbohydrate moiety of glycated proteins. For accurate HbA<SUB>1c</SUB> biosensing, we first removed blood components (except for hemoglobin) such as glycated proteins and blood glucose as they interfere with the boronate-based HbA<SUB>1c</SUB> competition analysis by reacting with the boronate-modified surface via a cis–diol interaction. After hemoglobin separation, target HbA<SUB>1c</SUB> and GOx at a predetermined concentration were reacted through a competition onto the boronate-modified electrode, allowing HbA<SUB>1c</SUB> to be detected linearly within a range of 4.5–15% of the separated hemoglobin sample (HbA<SUB>1c</SUB>/total hemoglobin). This range covers the required clinical reference range of diabetes mellitus. Hence, the proposed method can be used for measuring %HbA<SUB>1c</SUB> in whole human blood, and can also be applied to measuring the concentration of various glycated proteins that contain peripheral sugar groups.</P> <P><B>Highlights</B></P> <P>▸ We developed an accurate electrochemical HbA<SUB>1c</SUB> biosensor in whole human blood based on the competitive binding reaction of glycated proteins. ▸ Hemoglobin was separated from other blood components using a zinc ion-mediated separation method. ▸ Target HbA<SUB>1c</SUB> and signaling GOx was bound competitively onto the boronate group-modified electrode. ▸ HbA<SUB>1c</SUB> concentrations were determined linearly within a range of 4.5–15%, covering the required clinical reference range.</P>

고밀도폴리에틸렌 잠열축열재의 축/방열 특성 기초연구

한성옥(Han Seong Ok),이동원(Lee Dong Won),우상국(Woo Sang Kuk),한인섭(Han In Sub),윤응상(Yoon Eung Sang),주문창(Joo Moon Chang),양윤섭(Yang Yun Sub) 한국태양에너지학회 1998 한국태양에너지학회 학술대회논문집 Vol.- No.-