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Energy and AI 2024年第1期15卷 102-135页

作者： junghwan lee Huanli Sun Yongshan Liu Xue Li First Automobile Works Group Corporation Research and Development Center No.1 Xinhongqi StreetChangchun130013JilinChina

Accurate prediction of the remaining useful life(RUL)of lithium-ion batteries(LIBs)is pivotal for enhancing their operational efficiency and safety in diverse *** operational advantages,precise RUL predictions can also expedite advancements in cell design and fast-charging methodologies,thereby reducing cycle testing *** artificial neural networks(ANNs)showing promise in this domain,determining the best-fit architecture across varied datasets and optimization approaches remains *** study introduces a machine learning framework for systematically evaluating multiple ANN *** only 30%of a training dataset derived from 124 LIBs subjected to various charging regimes,an extensive evaluation is conducted across 7 ANN *** architecture is optimized in terms of hyperparameters using this framework,a process that spans 145 days on an NVIDIA GeForce RTX 4090 *** optimizing each model to its best configuration,a fair and standardized basis for comparing their RUL predictions is *** research also examines the impact of different cycling windows on predictive *** a stratified partitioning technique underscores the significance of consistent dataset representation across ***,using only the features derived from individual charge–discharge cycles,our top-performing model,based on data from just 40 cycles,achieves a mean absolute percentage error of 10.7%.

关键词： Remaining useful life Artificial neural networks Li-ion batteries Deep neural networks Machine learning Hyperparameter optimization

纯铜高压扭转压缩阶段塑性变形的实验及有限元分析(英文)

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稀有金属材料与工程 2013年第S2期42卷 301-304页

作者：王文珂宋月鹏高东升 junghwan lee EunYoo Yoon DongJun lee ChongSoo lee HyoungSeop Kim 山东农业大学山东泰安271018 韩国浦项工科大学(POSTECH) 韩国浦项790784 山东省园艺机械与装备重点实验室山东泰安271018 韩国材料科学研究所(KIMS) 韩国昌源641831

利用实验及有限元分析等手段,对纯铜高压扭转压缩阶段的塑性变形行为、硬度及显微组织分布进行了研究,结果表明,试样经压缩后,其硬度分布极为不均匀,边缘硬度高,轴心部位硬度低,而中间部位硬度变化较为平缓。模拟结果显示,试样在压缩过... 详细信息

利用实验及有限元分析等手段,对纯铜高压扭转压缩阶段的塑性变形行为、硬度及显微组织分布进行了研究,结果表明,试样经压缩后,其硬度分布极为不均匀,边缘硬度高,轴心部位硬度低,而中间部位硬度变化较为平缓。模拟结果显示,试样在压缩过程中的应力应变呈不均匀变化,由此引起试样各部位显微组织及晶粒变形不均匀。进一步研究表明,试样与模具间的摩擦对于压缩阶段试样变形具有重要影响。

关键词：塑性变形(SPD) 高压扭转(HPT) 压缩阶段塑性变形不均匀分布

Effect of molybdenum on interfacial properties of titanium carbide reinforced Fe composite

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Journal of Materials Science & Technology 2022年第12期107卷 252-258页

作者： Seungchan Cho junghwan Kim Ilguk Jo Jae Hyun Park Jaekwang lee Hyun-Uk Hong Bong Ho lee Wook Ryol Hwang Dong-Woo Suh Sang-Kwan lee Sang-Bok lee Composites Research Division Korea Institute of Materials Science(KIMS)Changwon 51508South Korea Advanced Materials Engineering Dong-Eui UniversityBusan 47340South Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityJinju 52828South Korea Department of Physics Pusan National UniversityBusan 46241South Korea Department of Materials Convergence and System Engineering Changwon National UniversityChangwon 51140South Korea Center for Core Research Facilities Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea School of Mechanical Engineering Gyeongsang National UniversityJinju 52828South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyGyeongbuk 37673South Korea

This study shows that the mechanical strength of the composite of Fe matrix and titanium carbide(Ti C)ceramic particles is significantly enhanced with addition of molybdenum(Mo) atoms. Ti C reinforced Fe(Fe-0.2C-7Mn) composites with and without Mo were fabricated by a liquid pressing infiltration(LPI)process and the effect of Mo on interfacial properties of TiC–Fe composite was investigated using atomic probe tomography(APT) analysis, molecular dynamics(MD) simulations, first-principle density functional theory(DFT), and thermodynamic calculations. First, DFT calculations showed that total energies of the Mo-doped Ti C–Fe superlattices strongly depend on the position of Mo defects, and are minimized when the Mo atom is located at the TiC/Fe interface, supporting the probable formation of MoC-like interphase at the TiC/Fe interface region. Then, APT analysis confirmed the DFT predictions by finding that about6.5 wt.% Mo is incorporated in the Ti C–Fe(Mo) composite and that sub-micrometer thick(Ti,Mo)C interphase is indeed formed near the interface. The MD simulations show that Mo atoms migrate to the Mo-free TiC–Fe interface at elevated temperatures and the mechanical strength of the interface is considerably enhanced, which is in good agreement with experimental observations.

关键词： Metal matrix composites(MMCs) Titanium carbide Fe matrix composite Infiltration Molybdenum Interfacial property

Endoscopic and clinicopathologic characteristics of early gastric cancer with high microsatellite instability

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World Journal of Gastroenterology 2012年第27期18卷 3571-3577页

作者： Jaehoon Jahng Young Hoon Youn Kwang Hyun Kim junghwan Yu Yong Chan lee Woo Jin Hyung Sung Hoon Noh Hyunki Kim Hoguen Kim Hyojin Park Sang In lee Department of Internal Medicine Gangnam Severance HospitalYonsei University College of MedicineSeoul 135-720South Korea Department of Internal Medicine Institute of GastroenterologyYonsei University College of MedicineSeoul 100-753South Korea Department of Surgery Yonsei University College of MedicineSeoul 100-753South Korea Department of Pathology Yonsei University College of MedicineSeoul 100-753South Korea

AIM： To investigate endoscopic and clinicopathologic characteristics of early gastric cancer （EGC） according to microsatellite instability phenotype. METHODS： Data were retrospectively collected from a single tertiary referral center. Of 981 EGC patients surgically treated between December 2003 and October 2007, 73 consecutive EGC patients with two or more microsatellite instability （MSI） mutation [high MSI （MSI-H）] and 146 consecutive EGC patients with one or no MSI mutation （non-MSI-H） were selected. The endoscopic and clinicopathologic features were compared between the MSI-H and non-MSI-H EGC ***： In terms of endoscopic characteristics, MSI-H EGCs more frequently presented with elevated pattern （OR 4.38, 95% Cl： 2.40-8.01, P 〈 0.001）, moderate- to-severe atrophy in the surrounding mucosa （OR 1.91, 95% CI： 1.05-3.47, P = 0.033）, antral location （OR 3.99, 95% CI： 2.12-7.52, P 〈 0.001） and synchronous le- sions, compared to non-MSI-H EGCs （OR 2.65, 95% CI： 1.16-6.07, P = 0.021）. Other significant clinicopatholog- ic characteristics of MSI-H EGC included predominance of female sex （OR 2.77, 95% CI： 1.53-4.99, P 〈 0.001）, older age （〉 70 years）（OR 3.30, 95% CI： 1.57-6.92, P = 0.002）, better histologic differentiation （OR 2.35, 95% Cl： 1.27-4.34, P = 0.007）, intestinal type by Lau- ren classification （OR 2.34, 95% CI： 1.15-4.76, P = 0.019）, absence of a signet ring cell component （OR 2.44, 95% CI： 1.02-5.86, P = 0.046）, presence of mu- cinous component （OR 5.06, 95% Cl： 1.27-20.17, P = 0.022）, moderate-to-severe lymphoid stromal reaction （OR 3.95, 95% CI： 1.59-9.80, P = 0.003）, and co-exist- ing underlying adenoma （OR 2.66, 95% CI： 1.43-4.95, P = 0.002）. CONCLUSION： MSI-H EGC is associated with unique endoscopic and clinicopathologic characteristics includ- ing frequent presentation in protruded type, co-exist- ing underlying adenoma, and synchronous lesions.

关键词： Microsatellite instability Early gastric can-cer Endoscopic characteristic Advanced gastric cancer

Dietary sophorolipid accelerates growth by modulation of gut microbiota population and intestinal environments in broiler chickens

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Journal of Animal Science and Biotechnology 2022年第1期13卷 256-264页

作者： Min-Jin Kwak Min-Young Park Yong-Soon Choi junghwan Cho Duleepa Pathiraja Jonggun Kim Hanbae lee In-Geol Choi Kwang-Youn Whang Department of Biotechnology Korea University145 Anam-roSeoul 02841Republic of Korea Pathway Intermediates Seoul 02841Republic of Korea

Background:Gut is a crucial organ for the host’s defense system due to its filtering action of the intestinal membrane from hazardous foreign *** strategy to strengthen the gut epithelial barrier function is to upregulate beneficial microflora populations and their ***(SPL),which is a glycolipid biosurfactant,could increase beneficial microflora and decrease pathogenic bacteria in the gastrointestinal ***,herein,we conducted an experiment with broiler chickens to investigate the fortifying effects of SPL on the host’s gut defense system by modulating the microbiota ***:A total of 5401-day-old chicks(Ross 308)were used,and they were immediately allotted into three treatment groups(6 replications with 30 chicks/pen)according to their initial body *** dietary treatments consisted of CON(basal diet),BAM(10 mg/kg bambermycin),and SPL(10 mg/kg SPL).During the experiment,birds freely accessed feed and water,and body weight and feed intake were measured at the end of each *** d 35,birds(one bird/pen)were sacrificed to collect jejunum and cecum ***:Dietary SPL and BAM supplementation significantly accelerated birds’growth and also significantly improved feed efficiency compared to *** microbial community was significantly separated by dietary SPL supplementation from that of CON,and dietary SPL supplementation significantly increased Lactobacillus *** Akkermansia ***,birds fed with dietary SPL also showed the highest concentration of cecal butyrate among all treatment *** morphological analysis showed that dietary SPL significantly increased villus height,ratio of villus height to crypt depth,goblet cell numbers,and the gene expression levels of claudin-1 and mucin ***,dietary SPL significantly decreased the mRNA expression level of pro-inflammatory cytokine,interleukin-6,and increased that of anti-inflammatory cytokine,interleukin-10,compared

关键词： Broilers Gut microbiota Gut morphology Local inflammation Mucus barrier Sophorolipids

Analysis of occupational noise for the healthy life according to the job characteristics

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Health 2012年第10期4卷 897-903页

作者： Lim-Kyu lee Ju-Hyun Kim Bokyung Kim junghwan Kim Department of Physical Therapy College of Public Health & Welfare Yongin University Yongin Korea Department of Physical Therapy Graduate Scool Yongin University Yongin Korea Department of Physiology Institute of Functional Genomics School of Medicine Konkuk University Seoul Korea

Noise is known that the physical risk factors defined as any unwanted sound. It can induce the health problems such as hearing loss or annoyance. The objective of this study was to assess the occupational noise exposure of nine groups for twenty peoples according to job characteristics and to compare the noise level by different variables. Personal noise levels were measured for three times using by dosimeters for each participant in Korea. The mean time weighted average noise level (TWA) of total was 73.2 ± 11.5 dBA by American conference of governmental industrial hygienists (ACGIH) standard. Especially, Korean classical music students were highly exposed to 93.2 ± 6.2 dBA but, office workers were 63.2 ± 6.6 dBA. In case of peak sound pressure level (Lpeak), Korean classical music students and firefighters were exposed to the highest level of 151.8 dBC and 145.8 dBC during playing and dispatching, respectively. The analysis of noise level showed that Leq had positive correlations between TWA by ministry of employment and labour (MOEL) (r = 0.98, p < 0.01) and TWA by ACGIH (r = 0.98, p < 0.01). Unlikely other groups, the noise exposure level of the Korean classical music students were exceeded the ACGIH standard. These results suggest that Korean classical music students were exposed high noise level and some solutions are need to reduce the noise exposure level such as using hearing protect device.

关键词： Occupational Noise Exposure Job Characteristics Dosimeters Noise Level

The Effects of Hippotherapy on Standing Balance in Patients with Incomplete Cervical Spinal Cord Injuries: A Pilot Study

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Neuroscience & Medicine 2013年第1期4卷 7-15页

作者： Bo-Ra Choi Ju-Hyun Kim Jeong-Uk lee junghwan Kim Department of Physical Therapy College of Public Health & Welfare Yongin University Yongin Korea. Laboratory of Health Science & Nanophysiotherapy Department of Physical Therapy Graduate School Yongin University Yongin Korea

The present study was designed to evaluate the effects of hippotherapy on standing balance in patients with incomplete cervical spinal cord injuries. Ten patients (8 men and 2 women) who were diagnosed with cervical levels of injury between 3 and 6, and D according to the ASIA Impairment Scale. All patients were tested by the physiotherapists prior to and after hippotherapy treatment. Standing balance was measured using the Interactive Balance System (IBS). The weight distribution index was significantly increased in application of hippotherapy compared with control groups in patients with a neurologic level of cervical 3 and 4, and with Brown-Sequard syndrome, respectively. However, most of the patients exhibited no significant changes in the standing balance index, such as F1, F2-4, F5-6, F7-8, and SI scores, after hippotherapy. These results suggest that hippotherapy did not have a significant effect on the standing balance of patients with incomplete cervical spinal cord injuries.

关键词： Spinal Cord Injury Standing Balance Hippotherapy

Design of Image Signal Processor for Hardware Size

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Journal of Measurement Science and Instrumentation 2010年第4期1卷 391-394页

作者： junghwan PARK Jong-sik PARK Jaekyung WEE Boo-gyoun KIM Seok lee Seong-soo lee School of Electronics Engineering Soongsil University Seoul 156-743 Korea Intelligent System Research Division Korea Institute of Science and Technology Seoul Korea

The Image sensor needs various image processing by Image Signal Processor （ISP） to improve image quality. Conventional cameras have their own software ISP functions to perform in PC instead of using commercial ISP chips. However these methods have problems such as large computation for image processing. In this paper, th authors proposed ISP that significantly reduced chip area by efficiently sharing of hardware and software. Large operation blocks are designed to hardware for high performances, and hardware is imployed simultaneously with software considering the size of the hardware. The implemented ISP can process Video Graphics Array （VGA）（640 ＊ 480） images and has 91 450 gates size in 0. 35 μm process.

关键词： Image Signal Processing vision camera low area image process

The Effect of Low Frequency Repetitive Transcranial Magnetic Stimulation Combined with Range of Motion Exercise on Paretic Hand Function in Female Patients after Stroke

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Neuroscience & Medicine 2013年第2期4卷 77-83页

作者： Mee-Young Kim Ju-Hyun Kim Jeong-Uk lee Byong-Yong Hwang junghwan Kim Department of Physical Therapy College of Public Health & Welfare Yongin University Yongin South Korea. Laboratory of Health Science & Nanophysiotherapy Department of Physical Therapy Graduate School Yongin University Yongin South Korea Laboratory of Health Science & Nanophysiotherapy Department of Physical Therapy Graduate School Yongin University Yongin South Korea

Repetitive transcranial magnetic stimulation (rTMS) has recently been demonstrated to improve motor function after stroke. However, no study has yet tested the synergetic effects of physical exercise on rTMS in clinical settings. We investigated the effect of a 6-session course of low frequency rTMS on contralesional primary motor cortex combined with range-of motion (ROM) exercise on paretic hand function in female stroke patients. This was a single-blind study of the effects of rTMS with or without ROM exercise in female hemiplegic patients after stroke. All patients underwent rTMS on the contralesional primary motor cortex for 15 minutes and ROM exercise on the paretic hand. The cortical excitability determined by the amplitude and latency of the motor evoked potential (MEP) was measured in both first dorsal interosseous (FDI) muscles. We also evaluated arm function using Box and Block, arm reach, 9-hole pegboard, power grip, and pinch grip force tests. The rTMS-induced MEP amplitude of the paretic side significantly increased whereas the non-paretic side showed a decrease through every session. However, the MEP latency significantly increased on the non-paretic hand at post-rTMS with exercise, but a tendency of decrement on paretic hand at same application. Motor function showed improvement in the 9-hole pegboard and arm reach tests at post-rTMS with exercise on the paretic side compared with the non-paretic side. A significant correlation was especially noted between motor function and MEP on the paretic side of stroke patients. Low frequency rTMS with ROM exercise improved hand function after stroke. This may, in part, result in additional rehabilitation in stroke patients.

关键词： Repetitive Transcranial Magnetic Stimulation Range of Motion Exercise Stroke Motor Recover

Differences in body components and electrical characteristics between youth soccer players and non-athletes

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Health 2013年第6期5卷 1010-1015页

作者： Seung-Min Yang Won-Deok lee Ju-Hyun Kim Mee-Young Kim junghwan Kim Department of Physical Therapy College of Public Health & Welfare Yongin University Yongin South Korea Laboratory of Health Science & Nanophysiotherapy Department of Physical Therapy Graduate Scool Yongin University Yongin South Korea

Many previous studies have focused on youth soccer player injuries without body component analysis compared to non-athletes. Only a few studies which have investigated body components of youth soccer players, and studies that look at electrical characteristics used by rheobase and chronaxie as well as body components are even scarcer. Therefore, we feel that there is a need for a study investigating objective clinical analysis of the body components (body structure and body composition) and electrical characteristics of both youth soccer players and non-athletes. Sixty subjects participated in our study, comprising of thirty youth soccer players and thirty non-athletes. The Inbody 520 was used to measure and analyze body composition and the Duo 500 was employed to measure electrical characteristics. It was observed that the soccer players showed markedly lower total impedance compared to the non-athletes. In both legs, it was particularly noted that there were significant differences between the right and left sides. The soccer players showed a higher skeletal muscle mass and lean/ideal lean × 100% compared to the non-athletes. Furthermore, the soccer players had a lower rheobase and higher chronaxie. A comparison of the genders showed a similar pattern. In this study, we were able to separate the differences in body components and electrical characteristics between the subject groups using a systemic approach. Future studies on diverse types of athletes would contribute further to the development of clinical physiotherapy and sports rehabilitation.

关键词： Body Components Electrical Characteristics Youth Soccer Players