http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
퍼지 결합 다항식 뉴럴 네트워크 기반 패턴 분류기 설계
노석범(Seok-Beom Rho),장경원(Kyung-Won Jang),안태천(Tae-Chon Ahn) 대한전기학회 2014 전기학회논문지 Vol.63 No.4
In this paper, we propose a fuzzy combined Polynomial Neural Network(PNN) for pattern classification. The fuzzy combined PNN comes from the generic TSK fuzzy model with several linear polynomial as the consequent part and is the expanded version of the fuzzy model. The proposed pattern classifier has the polynomial neural networks as the consequent part, instead of the general linear polynomial. PNNs are implemented by stacking the simple polynomials dynamically. To implement one layer of PNNs, the various types of simple polynomials are used so that PNNs have flexibility and versatility. Although the structural complexity of the implemented PNNs is high, the PNNs become a high order-multi input polynomial finally. To estimate the coefficients of a polynomial neuron, The weighted linear discriminant analysis. The output of fuzzy rule system with PNNs as the consequent part is the linear combination of the output of several PNNs. To evaluate the classification ability of the proposed pattern classifier, we make some experiments with several machine learning data sets.
Properties of Pepper Accessions under Flooding in Summer Season
Seok-Beom Kang,Myeong-Cheoul Cho,Yun-Young Yang,Tsung-Han Lin,Shih-Wen Lin,Yen-Wei Wang,Derek Barchenger,Hyungmin Rho 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Pepper (Capsicum sp.) is one of the major vegetable crops in the world. Recently, flooding frequently occurs around the world as climatic change becomes more serious. Especially, damages of flooded pepper continuously increased in poorly drained cultivation areas and paddy upland soil of pepper. This experiment was carried out to investigate the flooding stress tolerance of pepper accessions among the World Vegetable Center collection during the summer growing season. We used 17 pepper accessions from five species, (C. annuum; C. baccatum; C. chacoense; C. Chinese, and C. frutescens) and grew the seedlings for two months in seven-inch pots filled with sterilized garden soil with four replications. After the two-month growth, flooding was imposed for five days by submerging the pots into water. Growth and stress responses were measured to evaluate tolerance to flooding stress of the accessions. Five days after the flooding treatment, the pots were drained and maintained for three days for recovery. Finally, three days after the water drainage, growth and stress responses were reevaluated to assess plant recovery from flooding stress. After five days of flooding, plant height decreased with the exceptions of PBC2029, VI028788, VI029116, VI057807, VI029485, and PBC 934, which were not significantly different from the control. Plant canopy width was significantly depressed by the flooding for all accessions. The number of flowering plants tended to be decreased by the flooding treatment but there was no significant difference. In the summer season, wilting quickly occurred all of the accessions; especially, C. chinense and C. frutescens accessions were sensitive to flooding stress but AVPP9824 (C. annuum), VI029119, and VI044312 (C. chacoense) showed resistant response to the flooding. In all flooded accessions, the leaf temperature of pepper significantly increased at five days compared to the first day of flooding. SPAD index of pepper tended to be decreased in most accessions but, AVPP9824 and VI013286 were not different compared to the control. Pollen viability was variable among the accessions of this experiment. Proline content significantly increased in all of the accessions by the flooding treatment. From the results, we found that AVPP9824 (C. annuum), VI029119, and VI044312 (C. chacoense) accessions exhibited tolerance characteristics to flooding stress in the measured variables, but further research is needed to confirm this finding.
면심입방 금속(Cu, Rh, Pd, Ag) (001) 표면 위의 철 단층의 자성
윤원석(Won Seok Yun),차기범(Gi-Beom Cha),노태환(Tae Hwan Rho),한동호(Dong Ho Han),홍순철(Soon Cheol Hong) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.5
It is well-known that a meta-stable fcc bulk Fe has an antiferromagnetic (AFM) ground state and could be synthesized by growing Fe on a proper fcc metal substrate. In this study magnetism of Fe monolayers on nonmagnetic fcc transition metal (Cu, Rh, Pd, and Ag) (001) surfaces has been investigated using the all-electron full-potential linearized augmented plane wave method. The Fe monolayers on Rh(001) and Pd(001) surfaces were calculated to be stabilized in an AFM state, whereas the Fe monlayers on Cu(001) and Ag(001) surfaces are stabilized in a ferromagnetic (FM) state. Noting that Cu and Ag have the smallest and largest lattice constants and the fcc bulk Fe with a larger lattice constant is getting stabilized in a ferromagnetic state, it is unexpectable and interesting. The calculated magnetic moments of the Fe atoms on Cu, Rh, Pd, and Ag(001) surfaces are 2.811, 2.945, 2.987, and 2.990 μ<SUB>B</SUB> in FM states and 2.624, 2.879, 2.922, and 3.001 μ<SUB>B</SUB> in AFM states.
운용환경요인을 고려한 리튬이온전지의 외부단락 특성 연구
정재범(Jae-Beom Jung),임민규(Min-Gyu Lim),김진용(Jin-Yong Kim),노대석(Dae-Seok Rho) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.8
최근 몇 년간 국내외에서 전기자동차(electric vehicle, EV)와 에너지저장장치(energy storage system, ESS)에 적용되는 중대형 이차전지의 수요가 급격하게 늘어나고 있고, 이에 따라 시장 규모도 기하급수적으로 증가하고 있다. 하지만, 최근 발생하고 있는 EV와 ESS용 이차전지의 화재는 시장에 부정적인 영향을 주고 있다. 특히, 2017년 8월부터 발생한 국내 ESS 화재는 2021년 5월 현재까지 총 31건으로 보고되고 있어, 중대형 이차전지의 안전성 검증을 강화하기 위한 체계적인 연구의 필요성이 대두되고 있다. 따라서, 본 논문에서는 국내 중대형 이차전지에 사용되는 배터리 셀 중 범용으로 활용되는 NMC계열 각형 및 파우치형 전지를 대상으로 대표적인 안전성 시험 중 하나인 외부단락 시험을 수행하기 위한 사고모의 장치를 구현한다. 여기서, 외부단락시험용 사고모의장치는 단락저항, 계측장치부, 제어장치부 등으로 구성되며, 다양한 운용환경 시험조건에 따른 외부단락 특성을 분석할 수 있도록 구현한다. 이를 바탕으로 리튬이온전지의 형태, 단락저항 및 SOC에 따른 외부단락 시험을 수행하여, 단락저항과 SOC에 따른 전류 및 온도 특성을 제시한다. 또한, 전처리 온도와 전지 모듈 내 보호소자별 외부단락을 수행한 결과, 보호소자에 따른 전류 및 차단시간, 전처리 온도에 따른 외부단락 특성을 확인할 수 있어, 본 논문의 유효성을 확인하였다. In this paper, we utilize an accident simulation device to perform an external short-circuit test, one of the typical safety tests of IEC62619 for NMC prismatic and pouch-type batteries, which are widely used in battery cells of medium and large secondary batteries. The device consists of a short-circuit resistance, measurement device section, control device section, etc., to analyze external short-circuit characteristics according to various optional test conditions. Based on the output of the proposed test device, this paper presents the characteristics of current and temperature according to the short-circuit resistance and SOC by performing an external short-circuit test of a lithium-ion (Li-ion) battery. In addition, as a result of performing an external short-circuit for each protection element in the battery module and pre-processing temperature, the effectiveness of the characteristics of these elements can be evaluated.
중대형 배터리의 재사용을 위한 내부저항 평가에 관한 연구
정재범(Jae-Beom Jung),임민규(Min-Gyu Lim),김남현(Nam-Hyun Kim),김현재(Hyun-Jae Kim),노대석(Dae-Seok Rho) 대한전기학회 2023 전기학회논문지 Vol.72 No.6
Recently, used batteries are expected to dramatically increase according to the expansion of the EV(electric vehicle) market. Accordingly, Korean government has improved the supporting systems for the recycling of used batteries, and in particular, in the field of repurposing, various studies are being conducted for effective evaluation methods that can secure the performance and safety of batteries after use. Repurposing of used batteries is mostly adapted in the field of ESS(energy storage system) for normally used EV batteries and a total inspection before repurposing is required due to battery characteristics. Therefore, this paper investigates the operating mechanisms of the IR(internal resistance) test method, and implements a test device for middle and large sized cell and pack. Based on the proposed method, the IR of NMC-type commercial batteries is analyzed with various conditions, and it is confirmed that the proposed method is effective in IR measurement and safety evaluation for the repurposing battery.
Park, Jun-Beom,Rho, Hokyun,Bae, Hyojung,Chung, Tae Hun,Jeong, Tak,Ha, Jun-Seok The Electrochemical Society 2018 ECS journal of solid state science and technology Vol.7 No.12
<P>The transparent conductive electrodes (TCEs) that have high-transmittance in the ultra-violet region are reported. The TCEs in this paper consist of combination of single-walled carbon nanotubes (SWCNTs) and nanoscale Ni particles (Ni NPs). TCEs can form low-resistance by directly contacting to p-AlGaN without ohimic contact layer of p-GaN that absorbed light energy in the UV region. Ni NPs are combined on the surface of the SWCNTs to enhance the work function, resulting in the low contact resistance between TCEs and p-Al<SUB>0.3</SUB>Ga<SUB>0.7</SUB>N. And, the specific contact resistance of TCEs and p-Al<SUB>0.3</SUB>Ga<SUB>0.7</SUB>N is 8.97 × 10<SUP>−2</SUP> Ωcm,<SUP>2</SUP> which means that it is possible to improve the output power of light emitting diodes by directly forming TCEs on p-AlGaN without inserting p-GaN layer.</P>