检索结果-南通市图书馆

Fault area estimation using traveling wave for wide area protection

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2016年第3期4卷 478-486页

作者： Jae-won LEE won-ki kim Joon HAN won-Hyeok JANG Chul-Hwan kim Department of Electrical and Computer Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Daewoo Shipbuilding&Marine Engineering Co. Ltd.GeojeRepublic of Korea Electrical and Computer Engineering Department University of Illinois at Urbana-ChampaignChampaignILUSA

As the increasing number of Phasor Measurement Units(PMUs) are deployed, wide area protection in power systems has been gaining interest. In particular, fault detection, fault classification and fault area estimation are essential to reduce the damage of faults, and even prevent catastrophic cascades of failures. In this paper, we present a scheme for fault area estimation using PMUs and traveling wave theory. The purpose of this paper is to formulate a scheme for fault area estimation by calculating the approximate fault location based on traveling wave *** research has targeted at reliable operation of wide transmission system through the estimation of fault *** verify the suggested scheme, the various simulations are performed in practical Korean power transmission *** simulation results show that the proposed scheme has a good performance with high accuracy for estimating fault area.

关键词： Fault area estimation Phasor measurement unit(PMU) Transmission line system Traveling wave Wide area protection

Gas Sensing Characteristics of SnO_2 Whiskers Prepared from SNC_2O_4

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A03期35卷 100-103页

作者： ki-won kim Pyeong-Seok Cho Jong-Heun Lee Seong-Hyeon Hong Department of Materials Science & Engineering Korea UniversitySeoui 136-713Korea School of Materials Science and Engineering and Nano Systems Institute-National Core Research Center Seoul National UniversitySeoul 151-744Korea

SnO_2 whiskers were prepared from the decomposition of whisker-like SnC_2O_4,which was precipitated by a reaction between an aqueous SnCl_2 and oxalic acid solution at high solution temperatures (80℃).After the decomposition of SnC_2O_4 at 450℃,SnO_2 whiskers containing both of rutile and metastable orthorhombic phases were obtained with the content of the orthorhombic phase decreasing with increasing heat-treatment temperature and *** effect of orthorhombic phase upon CO gas sensitivity was investigated by measuring the evolution of the primary particle size and the CO sensitivity with repeating heat treatment at 450℃.The 50μg/g CO sensitivity increased with decreasing concentration of the orthorhombic phase despite particle coarsening,which suggests that the orthorhombic phase is detrimental to the CO gas sensitivity.

关键词： SnO2 whisker orthorhombic phase gas sensor SnC2O4

Segmental artery injury during transforaminal percutaneous endoscopic lumbar discectomy:Two case reports

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第33期10卷 12345-12351页

作者： Wan-Jae Cho ki-won kim Hyung-Youl Park Bo-Hyoung kim Jun-Seok Lee Department of Orthopedic Surgery Yeouido St.Mary’s HospitalCollege of MedicineCatholic University of KoreaSeoul 07345South Korea Department of Orthopedic Surgery Eunpyeong St.Mary’s HospitalCollege of MedicineCatholic University of KoreaSeoul 03312South Korea

BACKGROUND Since Kambin experimentally induced arthroscopy to treat herniated nucleus pulposus,percutaneous endoscopic lumbar discectomy(PELD)has been *** branch of the segmental artery around the neural foramen may be damaged during PELD using the transforaminal *** report 2 rare cases in which segmental artery injury that occurred during PELD was treated with emergency *** SUMMARY In case 1,a 31-year-old man was transferred to our emergency department with left lower quadrant abdominal pain after PELD at a local *** spine magnetic resonance imaging after the surgery showed a hematoma of the left retroperitoneal area and the psoas muscle *** suspicion of vascular injury,arteriography was *** and blood leakage from the left 4th lumbar segmental artery into the abdominal cavity were *** transarterial embolization was performed using fibered microcoils for bleeding of the segmental *** case 2,a 75-year-old woman was transferred to our emergency department with low blood pressure,right flank pain,and drowsy mental status after PELD at a local *** the patient arrived at the emergency room,the blood pressure decreased from 107/55 mmHg to 72/47 *** blood pressure *** suspicion of vessel injury,arteriography was performed,and the right 4th lumbar segmental artery rupture was *** transarterial embolization was performed for bleeding of segmental *** We were able to find the bleeding focus by angiography and treat the injury of the segmental artery successfully through emergency transarterial embolization.

关键词： Percutaneous endoscopic lumbar discectomy Segmental artery injury Transarterial embolization Angiography Case report

Performance and genetic diversity of 23 provenances of northern red oak(Quercus rubra L.)after 25 years of growth in South Korea

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2021年第5期32卷 2181-2188页

作者： ki-won kim Kyoung-Mi Lee Soon-Ho Kwon Ji-Min Park Yang-Gil kim Hye-In Kang Da-Bin Yum Kyu-Suk Kang Department of Agriculture Forestry and BioresourcesSeoul National UniversitySeoul 08826Republic of Korea Department of Forest Bioresources National Institute of Forest ScienceSuwon 16631Republic of Korea Department of Plant Resource Research Korea National ArboretumPocheon 11186Republic of Korea Research Institute of Agriculture and Life Sciences CALS_SNUSeoul 08826Republic of Korea

Growth traits and genetic diversity of 23 provenances of Quercus rubra introduced from North America were analyzed in a provenance trial established with a randomized block design in Hwaseong,Gyeonggi,South Korea in *** variables and survival at age 25 were compared with results from early ***,DBH,volume and stem straightness of *** was better than those of the domestic oak(Quercus accutissima).Growth of the Dunham Island provenance from New York was the best among the 23 provenances that of the Eagle River provenance from Wisconsin was *** rate at age25 was on average 52%.The longitude of seed origin and growth of provenance were consistently significantly negatively correlated at all *** of coastal provenances was superior to that of the inland provenances,which were separated by the Appalachian *** diversity and genetic distance among the provenances were evaluated using micro satellite *** allelic frequencies showed high polymorphism in 10 microsatellite loci,and 292 alleles were *** 10 loci,two were commonly found in the 23 *** mean allelic diversity and heterozygosity observed among the provenances were similar to those from the native populations of *** in North ***’s genetic distance among the 23 was estimated and showed that a clear trend between geographic and genetic distances,indicating that some provenances have high genetic diversity with superior growth performance.

关键词： Introduction breeding Provenance test Adaptation Microsatellite marker Genetic distance

Improved Cycle Properties of FeS_2 Cathode Material with Metallic Additives

在线全文

学校读者我要写书评

暂无评论

材料科学与工程学报 2007年第6期25卷 910-913页

作者： Jae-won Choi Jae-Kwang kim Gouri Cheruvally Jou-Hyeon Ahn ki-won kim Hyo-Jun Ahn Dong-Kyu Park Department of Chemical & Biological Engineering and Engineering Research Institute Gyeongsang National University900 Gajwa-dongJinju660-701Korea School of Nano and Advanced Materials Engineering and Engineering Research Institute Gyeongsang National University900 Gajwa-dongJinju660-701Korea Kaya Advanced Material Art Inc. Baekrok-Ri 1010-1Yangsan 626-862Korea

Iron disulfide(FeS_2)cathode active material was prepared from iron and sulfur at room temperature by high energy mechanical *** FeS_2 composites containing Co or Ni transition metal powders as additives were also prepared by the same *** cells with these FeS_2 cathodes were studied for charge-discharge properties at room temperature using 0.5M LiTFSI in tetra(ethylene glycol)dimethyl ether(TEGDME)*** voltammetry showed two anodic oxidation peaks at 1.8 and 2.5V and two cathodic reduction peaks at 2.0 and 1.3 V for FeS_2 with metal *** addition of 5wt% Co and 3wt% Ni resulted in an enhancement of the first discharge capacity giving 571 and 844mAh/g respectively at *** cycle performance was also enhanced remarkably by the addition of these electrically conductive transition metals in the active ***_2 with 5wt% Co exhibited a stable cycle performance delivering a reversible capacity of 338mAh/g(37.8% of theoretical capacity)after 20 cycles.

关键词：阴极材料二硫化铁锂离子电池循环性能

Electrochemical Intercalation of Sodium into Silicon Thin Film

在线全文

学校读者我要写书评

暂无评论

材料科学与工程学报 2008年第1期26卷 141-144页

作者： Dong-Yeon kim Hyo-Jun Ahn Gyu-Bong Cho Jong-Seon kim Ho-Suk Ryu ki-won kim Jou-Hyeon Ahn won-Cheol Shin I-cube center nano advanced materials Engineering Gyeongsang National Uhiversity Jinju 660-701 Korea Department of Chemical ＆ Biological Engineering Gyeongsang National University J inju 660-701 Korea INOSTEK Inc Gyeonggi Technopark 1271-11 Sal-dong Sangnok-gu Ansan-si Gyeonggi-do 426-901 Korea

In order to investigate the possibility of Si thin film as an anode for Na battery,we studied the electrochemical intercalation of sodium into the Si *** Si thin film electrode was prepared using DC magnetron *** ion could intercalate into Si thin film upto Na0.52Si,i.e.530mAh·*** first discharge capacity was 80mAh·g-1-Si,which meant reversible amount of sodium *** discharge capacity slightly decreased to 70mAh·g-1-Si after 10 cycles.

关键词：钠插层反应电池硅薄膜电极直流电磁控溅射

Effect of Oxide Assisted Metal Nanoparticles on Microstructure and Morphology of Gallium oxide Nanowires

在线全文

学校读者我要写书评

暂无评论

材料科学与工程学报 2007年第6期25卷 886-891页

作者： Kyo-Hong CHOI Kwon-Koo CHO Gyu-Bong CHO Hyo-Jun AHN ki-won kim Yoo-Young kim School of Nano & Advanced Materials Engineering ERI & i-cube centerGyeongsang National University900 GazwadongJinjuGyeongnam 660-701Korea Dept.of Mechanical Engineering Jinju National UniversityJinjuKorea

Several researches have been reported about the characteristic of β-Ga_2O_3 nanowires which was synthesized on nickel oxide *** indeed,recent researches about synthesis of β-Ga_2O_3 nanowires on oxide-assisted transition metal are limited to nickel or cobalt oxide *** this work,Gallium oxide(β-Ga_2O_3)nanowires were synthesized by a simple thermal evaporation method from gallium powder in the range of 700-1000℃ using the iron,nickel,copper,cobalt and zinc oxide as a catalyst,*** β-Ga_2O_3 nanowires with single crystalline without defects were successfully synthesized at the reaction temperature of 850,900 and 950℃ in all the *** optimum experimental condition in synthesis of nanowires varied with the kind of *** increasing synthesis temperature,the morphology of gallium oxide nanowires changed from nanowires to nanorods,and its diameter *** these results,we could be proposed that the growth mechanism of β-Ga_2O_3 nanowires was changed with synthesis temperature of *** and morphology of Synthesized nanowire was characterized by HR-TEM,FE-SEM,EDX and XRD.

关键词：金属纳米粒子显微结构镓氧化物形态学

Apolipoprotein A-I binding protein-mediated neuroprotection in glaucomatous neuroinflammation and neurodegeneration

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1414-1415页

作者： Sinwoo Hwang Seunghwan Choi Soo-Ho Choi Keun-Young kim Yury I.Miller won-Kyu Ju Hamilton Glaucoma Center and Shiley Eye Institute The Viterbi Family Department of OphthalmologyUniversity of California San DiegoLa JollaCAUSA Department of Medicine University of California San DiegoLa JollaCAUSA National Center for Microscopy and Imaging Research Department of NeurosciencesUniversity of California San DiegoLa JollaCAUSA

Glaucoma is a multifactorial eye disorder that can cause vision loss and irreversible blindness,affecting individ uals aged 40 to 80 yea rs *** to the aging population,it is expected that the number of people affected by glaucoma will surpass 111 million by 2040 as the disease becomes more *** primarily contributes to optic nerve axon loss and the progressive degeneration of retinal ganglion cells (RGCs),subsequently leading to vision impairment.

关键词： irreversible pass primarily

A Flexible Smart Healthcare Platform Conjugated with Artificial Epidermis Assembled by Three‑Dimensionally Conductive MOF Network for Gas and Pressure Sensing

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 601-620页

作者： Qingqing Zhou Qihang Ding Zixun Geng Chencheng Hu Long Yang Zitong Kan Biao Dong Miae won Hongwei Song Lin Xu Jong Seung kim State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry Korea UniversitySeoul 02841Republic of Korea TheranoChem Incorporation Seoul 02856Republic of Korea

The rising flexible and intelligent electronics greatly facilitate the noninvasive and timely tracking of physiological information in telemedicine *** building bionic-sensitive moieties is vital for designing efficient electronic skin with advanced cognitive functionalities to pluralistically capture external ***,realistic mimesis,both in the skin’s three-dimensional interlocked hierarchical structures and synchronous encoding multistimuli information capacities,remains a challenging yet vital need for simplifying the design of flexible logic ***,we construct an artificial epidermal device by in situ growing Cu_(3)(HHTP)_(2) particles onto the hollow spherical Ti_(3)C_(2)T_(x) surface,aiming to concurrently emulate the spinous and granular layers of the skin’s *** bionic Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2) exhibits independent NO_(2) and pressure response,as well as novel functionalities such as acoustic signature perception and Morse code-encrypted message ***,a wearable alarming system with a mobile application terminal is self-developed by integrating the bimodular senor into flexible printed *** system can assess risk factors related with asthmatic,such as stimulation of external NO_(2) gas,abnormal expiratory behavior and exertion degrees of fingers,achieving a recognition accuracy of 97.6%as assisted by a machine learning *** work provides a feasible routine to develop intelligent multifunctional healthcare equipment for burgeoning transformative telemedicine diagnosis.

关键词： Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2)composites NO_(2)/pressure flexible sensors Health-monitoring Machine learning