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Corrosion characteristics of steel in seawater containing various chloride concentrations generated by electrochemical method

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中国有色金属学会会刊：英文版 2009年第B09期19卷 50-55页

作者： Seong-Jong KIM Seok-Ki jang Division of Marine Engineering Mokpo Maritime University

The electro-clean system (ECS), a ballast water management system that eliminates harmful aquatic organisms in ship ballast water via electrochemically produced chloride, was developed. The current density for potentiostatic experiments subjected to seawater with an applied potential (-0.1 V) at various TRC concentrations (2×10-6, 6×10-6, 10×10-6, and 15×10-6) have similar results. The current density at -0.1 V has the highest value compared with that at -0.7 V and -0.4 V. For all concentrations, the current density increases with increasing applied potential.

关键词：含氯化物电化学方法腐蚀特性浓度海水船舶压载水钢铁电流密度

Application of the ground cooling system for rural houses air conditioning in northeastern China

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International Journal of Agricultural and Biological Engineering 2022年第2期15卷 230-235页

作者： Moon Ki jang College of Information&Electric Engineering Shenyang Agricultural UniversityShenyang 110161China

This study developed an appropriate ground cooling system that can be used for indoor cooling during summers in rural houses in northeastern *** apply this system,a traditional rural house was selected and a heat exchanger was designed(PE pipe,32 m in length),manufactured,and installed according to the cooling load(2206 kJ/h)of one room of the experimental *** to the experiment,the temperature of Room 1 equipped with the cooling system was 3℃ lower than that of Room 2 without the ground cooling system during the same time *** temperature reduction effect of this system was confirmed through this *** the ground cooling system was used in rural houses in Northeast China,it was found that a burial depth of 1.5-2.0 m for the ground heat exchanger is appropriate for considering workability and frost *** use of the ground cooling system for indoor cooling during summers for rural houses in the northeastern region of China would reduce not only environmental pollution and the use of fossil fuels but also ease farmers off a certain amount of financial burden.

关键词： ground cooling system ground heat exchanger air conditioning system rural houses

A Hybrid Instance Selection Using Nearest-Neighbor for Cross-Project Defect Prediction

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Journal of Computer Science & Technology 2015年第5期30卷 969-980页

作者： Duksan Ryu Jong-In jang Jongmoon Baik School of Computinq Korea Advanced Institute of Science and Technology Yuseong-gu Daejeon 305-701 Korea

Software defect prediction （SDP） is an active research field in software engineering to identify defect-prone modules. Thanks to SDP, limited testing resources can be effectively allocated to defect-prone modules. Although SDP requires sufficient local data within a company, there are cases where local data are not available, e.g., pilot projects. Companies without local data can employ cross-project defect prediction （CPDP） using external data to build classifiers. The major challenge of CPDP is different distributions between training and test data. To tackle this, instances of source data similar to target data are selected to build classifiers. Software datasets have a class imbalance problem meaning the ratio of defective class to clean class is far low. It usually lowers the performance of classifiers. We propose a Hybrid Instance Selection Using Nearest-Neighbor （HISNN） method that performs a hybrid classification selectively learning local knowledge （via k-nearest neighbor） and global knowledge （via na/ve Bayes）. Instances having strong local knowledge are identified via nearest-neighbors with the same class label. Previous studies showed low PD （probability of detection） or high PF （probability of false alarm） which is impractical to overall performance as well as high PD and low PF. use. The experimental results show that HISNN produces high overall performance as well as high PD and low PF.

关键词： software defect analysis instance-based learning nearest-neighbor algorithm data cleaning

Applications of numerical optimization techniques to design of axial compressor blades

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航空动力学报 2007年第4期22卷 645-652页

作者： Choon-Man jang Kwang-Yong Kim Fire and Engineering Services Research Department KICT Department of Mechanical Engineering Inha University

This paper describes the shape optimization of NASA rotor 37 and rotor and stator blades in a single-stage transonic axial *** optimization of the blades operating at the design flow condition has been performed using the response surface method and three-dimensional Navier-Stokes ***-layer approximation is introduced to the Navier-Stokes equations,and an explicit Runge-Kutta scheme is used to solve the governing *** three design variables,blade sweep,lean and skew,are introduced to optimize the three-dimensional stacking line of the *** objective function of the shape optimization is an adiabatic *** the optimization of rotor and stator blades, optimal blade shape can be *** is noted the increase of adiabatic efficiency by optimization of the blade shape with the stacking line in the single-stage transonic axial compressor is more effective in a rotor blade rather than a stator blade because of the large deformation of blade shape in the stator blade.

关键词：轴挤压叶片机航空推进系统最优化倾斜

Hepatitis B virus reactivation in patients with hepatocellular carcinoma undergoing anti-cancer therapy

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World Journal of Gastroenterology 2014年第24期20卷 7675-7685页

作者： Jeong Won jang Division of Hepatology Department of Internal MedicineCollege of MedicineThe Catholic University of KoreaSeoul 137-701South Korea

Patients with hepatocellular carcinoma (HCC) often experience hepatic morbidity. Hepatitis B virus (HBV) reactivation is well documented as a serious hepatic morbidity during anti-cancer therapy. Reported rates of HBV reactivation in chronic carriers with HCC undergoing chemotherapy range from 4%-67%. Apart from chemotherapy, HBV reactivation has been increasingly identified in settings of hepatectomy and local ablation therapies. The rates of HBV reactivation vary with different levels of immunosuppression and depend on treatment, viral factors, and patient characteristics. The principal concern relating to reactivation is that a substantial proportion of patients with reactivation suffer from liver dysfunction during therapy, which often leads to disruption of planned, potentially life-prolonging treatments, adversely affecting the patients’ final outcome. The first step in the management of HBV reactivation is identification of patients at risk of reactivation by testing for HBV serology prior to commencing anti-cancer therapy. Although it is a serious complication, HBV reactivation is preventable with prophylactic anti-HBV drugs. Multiple publications have shown the benefit of prophylactic or preemptive antiviral therapy in this setting and justified such an approach before the start of therapy. Given the tumors and underlying cirrhosis, long-term use of antivirals with high potency and low risk of resistance is recommended in patients with HCC. This topic review will summarize the epidemiology, pathogenesis, and clinical issues related to HBV reactivation in HCC patients, and will discuss proper management against HBV reactivation during anti-cancer therapy for HCC.

关键词： Hepatitis B virus Virus activation Hepatic morbidity Hepatocellular carcinoma Immunosuppression

Association between MDM2-SNP309 and hepatocellular carcinoma in Taiwan Residents population

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World Journal of Gastroenterology 2009年第44期15卷 5592-5597页

作者： Jyh-Der Leu I-Feng kin Ying-Fang sun su-Mei Chen Chih-Chao Liu Yi-jang Lee Division of Radiation Oncology Taipei City Hospital Ran Ai Branch 10629 Taipei Taiwan China Department of Public Health National Yang-Ming University 112 Taipei Taiwan China Department of Biomedical Imaging and Radiological Sciences National Yang-Ming University 112 Taipei Taiwan China Division of Nuclear Medicine Taipei City Hospital Ren Ai Branch 10629 Taipei Taiwan China Institute of Environmental and Occupational Healthy Sciences National Yang-Ming University 112 Taipei Taiwan China

AIM:To investigate the risk association and compare the onset age of hepatocellular carcinoma(HCC) patients in Taiwan with different genotypes of MDM2- SNP309. METHODS:We analyzed MDM2-SNP309 genotypes from 58 patients with HCC and 138 cancer-free healthy controls *** of MDM2-SNP309 was conducted by restriction fragment length polymor- phism assay. REsuLTS:The proportion of homozygous MDM2- SNP309 genotype(G/G)in cases and cancer-free healthy controls was similar(17.2%vs 16.7%).Multi-variate analysis showed that the risk of G/G genotypeof MDM2-SNP309 vs wild-type T/T genotype in patients with HCC was not significant(OR=1.265,95% CI=0.074-21.77)after adjustment for sex,hepatitis B or C virus infection,age,and cardiovascular disease/ ***,there was a trend that GG genotype of MDM2-SNP309 might increase the risk in HCC patients infected with hepatitis virus(OR=2.568, 95%CI=0.054-121.69).Besides,the homozygous MDM2-SNP309 genotype did not exhibit a significantly earlier age of onset for HCC. CONCLUSION:Current data suggest that the asso- ciation between MDM2-SNP309 GG genotype and HCC is not significant,while the risk may be enhanced in patients infected by hepatitis virus in Taiwan.

关键词： MDM2 protein Hepatocellular carcinoma Taiwan Tumor suppressor protein p53

Fully rubbery synaptic transistors made out of all-organic materials for elastic neurological electronic skin

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Nano Research 2022年第2期15卷 758-764页

作者： Hyunseok Shim Seonmin jang Jae Gyu jang Zhoulyu Rao Jong-ln Hong Kyoseung Sim Cunjiang Yu Materials Science and Engineering Program University of HoustonHoustonTX 77204 USA Department of Chemistry Seoul National UniversitySeoul 08826Republic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Department of Mechanical Engineering University of HoustonHoustonTX 77204 USA Department of Biomedical Engineering University of HoustonHoustonTX 77204USA Department of Electrical and Computer Engineering University of HoustonHoustonTX 77204 USA Texas Center for superconductivity University of HoustonHoustonTX 77204USA

Neurologic function implemented soft organic electronic skin holds promise for wide range of applications,such as skin prosthetics,neurorobot,bioelectronics,human-robotic interaction(HRI),***,we report the development of a fully rubbery synaptic transistor which consists of all-organic materials,which shows unique synaptic characteristics existing in biological *** synaptic characteristics retained even under mechanical stretch by 30%.We further developed a neurological electronic skin in a fully rubbery format based on two mechanoreceptors(for synaptic potentiation or depression)of pressure-sensitive rubber and an all-organic synaptic *** converting tactile signals into Morse Code,potentiation and depression of excitatory postsynaptic current(EPSC)signals allow the neurological electronic skin on a human forearm to communicate with a robotic *** collective studies on the materials,devices,and their characteristics revealed the fundamental aspects and applicability of the all-organic synaptic transistor and the neurological electronic skin.

关键词： synaptic transistor stretchable electronic skin all-organic

孤岛微电网的虚拟同步发电机分布式协同二次调频控制

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电气工程学报 2024年第1期19卷 334-343页

作者：李斌龚祥祥胡丹丹曾志辉王浩河南理工大学电气工程与自动化学院焦作454003 河南理工大学河南省智能装备直驱技术与控制国际联合实验室焦作454003 国网河南省电力公司焦作供电公司焦作454003

基于孤岛微电网中虚拟同步发电机一次控制存在的频率偏差问题,提出一种基于预定时系统的分布式二次频率控制策略。该策略通过预定时系统对一致性进行改进并适配虚拟同步发电机本体算法,使各逆变器仅依靠相邻单元的通信,即可实现系统有... 详细信息

基于孤岛微电网中虚拟同步发电机一次控制存在的频率偏差问题,提出一种基于预定时系统的分布式二次频率控制策略。该策略通过预定时系统对一致性进行改进并适配虚拟同步发电机本体算法,使各逆变器仅依靠相邻单元的通信,即可实现系统有功缺额按容量分配与频率的无差控制。同时,预定时系统通过提前设定一致性的收敛时间,进一步提高频率的恢复速度,并且无需考虑初始容量与协议参数的影响,有利于分布式电源的即插即用,提高运行效率。最后通过仿真验证了所提控制策略的可行性和有效性。

关键词：孤岛微电网虚拟同步发电机一致性算法二次频率控制频率定时恢复

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Optimum traveling and rotation speeds in friction stir welding for dissimilar Al alloys

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Transactions of Nonferrous Metals Society of China 2011年第7期21卷 1486-1490页

作者： Jae-Cheul PARK Min-su HAN Seok-Ki jang Seong-Jong KIM Division of Marine System Engineering Mokpo Maritime UniversityMokpo CityJeonnam530-729Korea

Aluminum alloys are subjected to large deformation and decreased strength due to the high expansion modulus caused by heat effects during friction stir welding （FSW）.The optimum conditions for friction stir welding of 5052-O and 6061-T6 Al alloys were *** optimum traveling and rotation speeds were identified to be 61mm/min and 1600r/min using various mechanical characteristic evaluation methods.

关键词： Al alloy friction stir welding (FSW) traveling speed rotation speed mechanical property