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폴리에스테르 섬유 감량시스템용 프로세서 타이트레이터 개발
조진호,이흥락,이종현,김명남,구성모,김무영,진경찬,유병희,강민수,김국진 경북대학교 센서기술연구소 1993 연차보고서 Vol.1993 No.-
폴리에스테르 섬유 감량시스템의 제어를 위해서는 처리조 내에서 감량되는 섬유가 목표 감량치에 도달했는지를 판단해 주는 장치가 필요하다. 본 연구에서는 가성소다용액의 초농도 및 섬유 감량 정도의 정확한 측정과 감량 종료시간의 산출 및 이에 따른 종료신호를 발생할 수 있는 폴리에스테르 섬유 감량기 전용의 자동적정장치를 개발하였다. To control caustic soda treatment system for the polyester fabric reduction, we need the device to determine that the fabric has been arrived target reduction value. In this study, we develope an automatic process titrator for the caustic soda treatment system. Major functions of the target titrating system are accurate measurements of the caustic soda concentration and then producing the end point signal for caustic soda treatment system.
You, Byoung Kuk,Kim, Jong Min,Joe, Daniel J.,Yang, Kyounghoon,Shin, Youngsoo,Jung, Yeon Sik,Lee, Keon Jae American Chemical Society 2016 ACS NANO Vol.10 No.10
<P>Memristor devices based on electrochemical metallization operate through electrochemical formation/dissolution of nanoscale metallic filaments, and they are considered a promising future nonvolatile memory because of their outstanding characteristics over conventional charge-based memories. However, nanoscale conductive paths or filaments precipitated from the redox process of metallic elements are randomly formed inside oxides, resulting in unexpected and stochastic memristive switching parameters including the operating voltage and the resistance state. Here, we present the guided formation of conductive filaments in Ag nanocone/SiO, nanomesh/Pt memristors fabricated by high-resolution nanotransfer printing. Consequently, the uniformity of the memristive switching behavior is significantly improved by the existence of electric-field concentrator arrays consisting of Ag nanocones embedded in SiO2 nanomesh structures. This selective and controlled filament growth was experimentally supported by analyzing simultaneously the surface morphology and current mapping results using conductive atomic force microscopy. Moreover, stable multilevel switching operations with four discrete conduction states were achieved by the nanopatterned memristor device, demonstrating its potential in high density nanoscale memory devices.</P>
You, Byoung Kuk,Park, Woon Ik,Kim, Jong Min,Park, Kwi-Il,Seo, Hyeon Kook,Lee, Jeong Yong,Jung, Yeon Sik,Lee, Keon Jae American Chemical Society 2014 ACS NANO Vol.8 No.9
<P>Resistive random access memory (ReRAM) is a promising candidate for future nonvolatile memories. Resistive switching in a metal–insulator–metal structure is generally assumed to be caused by the formation/rupture of nanoscale conductive filaments (CFs) under an applied electric field. The critical issue of ReRAM for practical memory applications, however, is insufficient repeatability of the operating voltage and resistance ratio. Here, we present an innovative approach to reliably and reproducibly control the CF growth in unipolar NiO resistive memory by exploiting uniform formation of insulating SiO<SUB><I>x</I></SUB> nanostructures from the self-assembly of a Si-containing block copolymer. In this way, the standard deviation (SD) of set and reset voltages was markedly reduced by 76.9% and 59.4%, respectively. The SD of high resistance state also decreased significantly, from 6.3 × 10<SUP>7</SUP> Ω to 5.4 × 10<SUP>4</SUP> Ω. Moreover, we report direct observations of localized metallic Ni CF formation and their controllable growth using electron microscopy and discuss electrothermal simulation results based on the finite element method supporting our analysis results.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-9/nn503713f/production/images/medium/nn-2014-03713f_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn503713f'>ACS Electronic Supporting Info</A></P>
Self-Structured Conductive Filament Nanoheater for Chalcogenide Phase Transition
You, Byoung Kuk,Byun, Myunghwan,Kim, Seungjun,Lee, Keon Jae American Chemical Society 2015 ACS NANO Vol.9 No.6
<P>Ge<SUB>2</SUB>Sb<SUB>2</SUB>Te<SUB>5</SUB>-based phase-change memories (PCMs), which undergo fast and reversible switching between amorphous and crystalline structural transformation, are being utilized for nonvolatile data storage. However, a critical obstacle is the high programming current of the PCM cell, resulting from the limited pattern size of the optical lithography-based heater. Here, we suggest a facile and scalable strategy of utilizing self-structured conductive filament (CF) nanoheaters for Joule heating of chalcogenide materials. This CF nanoheater can replace the lithographical-patterned conventional resistor-type heater. The sub-10 nm contact area between the CF and the phase-change material achieves significant reduction of the reset current. In particular, the PCM cell with a single Ni filament nanoheater can be operated at an ultralow writing current of 20 μA. Finally, phase-transition behaviors through filament-type nanoheaters were directly observed by using transmission electron microscopy.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-6/acsnano.5b02579/production/images/medium/nn-2015-02579q_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b02579'>ACS Electronic Supporting Info</A></P>
Optimization of Powder Core Inductors of Buck-Boost Converters for Hybrid Electric Vehicles
You, Bong-Gi,Kim, Jong-Soo,Lee, Byoung-Kuk,Choi, Gwang-Bo,Yoo, Dong-Wook The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.4
In the present paper, the characteristics of Mega-Flux$^{(R)}$, JNEX-Core$^{(R)}$, amorphous and ferrite cores are compared to the inductor of buck-boost converters for Hybrid Electric Vehicles. Core losses are analyzed at the condition of 10 kHz sine wave excitations, and permeability fluctuations vs. temperature and magnetizing force will be analyzed and discussed. Under the specifications of the buck-boost converter for 20 kW THS-II, the power inductor will be designed with Mega-Flux$^{(R)}$ and JNEX-Core$^{(R)}$, and informative simulation results will be provided with respect to dc bias characteristics, core and copper losses.
Proposal of Potted Inductor with Enhanced Thermal Transfer for High Power Boost Converter in HEVs
You, Bong-Gi,Ko, Jeong-Min,Kim, Jun-Hyung,Lee, Byoung-Kuk The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
A hybrid electric vehicle (HEV) powertrain has more than one energy source including a high-voltage electric battery. However, for a high voltage electric battery, the average current is relatively low for a given power level. Introduced to increase the voltage of a HEV battery, a compact, high-efficiency boost converter, sometimes called a step-up converter, is a dc-dc converter with an output voltage greater than its input voltage. The inductor occupies more than 30% of the total converter volume making it difficult to get high power density. The inductor should have the characteristics of good thermal stability, low weight, low losses and low EMI. In this paper, Mega Flux<sup>®</sup> was selected as the core material among potential core candidates. Different structured inductors with Mega Flux<sup>®</sup> were fabricated to compare the performance between the conventional air cooled and proposed potting structure. The proposed inductor has reduced the weight by 75% from 8.8kg to 2.18kg and the power density was increased from 15.6W/cc to 56.4W/cc compared with conventional inductor. To optimize the performance of proposed inductor, the potting materials with various thermal conductivities were investigated. Silicone with alumina was chosen as potting materials due to the high thermo-stable properties. The proposed inductors used potting material with thermal conductivities of 0.7W/m·K, 1.0W/m·K and 1.6W/m·K to analyze the thermal performance. Simulations of the proposed inductor were fulfilled in terms of magnetic flux saturation, leakage flux and temperature rise. The temperature rise and power efficiency were measured with the 40kW boost converter. Experimental results show that the proposed inductor reached the temperature saturation of 107℃ in 20 minutes. On the other hand, the temperature of conventional inductor rose by 138℃ without saturation. And the effect of thermal conductivity was verified as the highest thermal conductivity of potting materials leads to the lowest temperature saturations.
Inductor Design Method of DCM Interleaved PFC Circuit for 6.6-kW On-board Charger
You, Bong-Gi,Lee, Byoung-Kuk,Kim, Dong-Hee The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.6
Because the on-board charger (OBC) is installed in electric vehicles (EVs), high power density is regarded as a key technology. Among components of the OBC, inductors occupy more than 30% of the total volume. Thus, it is important to reduce the volume and the weight of inductors while maintaining thermal stability. Discontinuous conduction mode (DCM) can satisfy these requirements; however, only a few studies have adopted the DCM operation for OBCs because of the large inductor current ripple. In this paper, a design process is proposed for application of the DCM operation to OBCs. In order to analyze the inductor losses accurately, a numerical formula for the inductor current ripple is deduced based on a detailed analysis. Two inductors are fabricated using several ferrite cores and powder cores taking into consideration the inductor size, inductor losses, and temperature rise. In order to verify the analysis and design process, experimental results are presented that show that the designed inductors satisfy the requirements of the OBCs.
조직 특이 발현 Sodium Iodide Symporter 유전자 이입에 의한 방사성옥소 간암세포 치료와 광학영상을 이용한 치료효과 평가
장병국 ( Byoung Kuk Jang ),이유라 ( You La Lee ),이용진 ( Yong Jin Lee ),안손주 ( Sohn Joo Ahn ),류민정 ( Min Jung Ryu ),윤선미 ( Sun Mi Yoon ),이상우 ( Sang Woo Lee ),유정수 ( Jeong Soo Yoo ),조제열 ( Je Yeol Cho ),이재태 ( Jae T 대한핵의학회 2008 핵의학 분자영상 Vol.42 No.5
Bong-Gi You,Sang-Won Lee,Gwang-Bo Choi,Dong-Wook Yoo,Byoung-kuk Lee 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In this paper, Mega Flux<SUP>®</SUP> core is used to establish the buck-boost Inductor for Hybrid Electric Vehicles among potential candidate core materials such as Mega Flux<SUP>®</SUP> core, JNEX<SUP>®</SUP> core and Metglass<SUP>®</SUP> . The buckboost Inductor must have thermal stability, small size, low losses and low EMI noise in automobile applications. Magnetic simulations were tried in terms of magnetic flux saturation level, AC copper loss due to flux leakage and temperature rise at the condition of the water coolant of 65 degrees Celsius. Similar operation tests with HEVs dc-dc converter were fulfilled with established 40kWatt dc-dc converter system. Comparisons between simulation and experimental results will be provided with the temperature rise. Simulation results were verified with experimental thermal configuration.
Optimization of Powder Core Inductors of Buck-Boost Converters for Hybrid Electric Vehicles
Bong-Gi You,Jong-Soo Kim,Byoung-Kuk Lee,Gwang-Bo Choi,Dong-Wook Yoo 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.4
In the present paper, the characteristics of Mega-Flux<SUP>®</SUP>, JNEX-Core<SUP>®</SUP>, amorphous and ferrite cores are compared to the inductor of buck-boost converters for Hybrid Electric Vehicles. Core losses are analyzed at the condition of 10 ㎑ sine wave excitations, and permeability fluctuations vs. temperature and magnetizing force will be analyzed and discussed. Under the specifications of the buck-boost converter for 20 ㎾ THS-Ⅱ, the power inductor will be designed with Mega-Flux<SUP>®</SUP> and JNEX-Core<SUP>®</SUP>, and informative simulation results will be provided with respect to dc bias characteristics, core and copper losses.