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| 1 | Direct bandgap germanium-on-silicon inferred from 5.7% <100> uniaxial tensile strain [Invited]显示文摘We report uniaxial tensile strains up to 5.7%along h100i in suspended germanium(Ge)wires on a silicon substrate,measured using Raman spectroscopy.This strain is sufficient to make Ge a direct bandgap semiconductor.Theoretical calculations show that a significant fraction of electrons remain in the indirect conduction valley despite the direct bandgap due to the much larger density of states;however,recombination can nevertheless be dominated by radiative direct bandgap transitions if defects are minimized.We then calculate the theoretical efficiency of direct bandgap Ge LEDs and lasers.These strained Ge wires represent a direct bandgap Group IV semiconductor integrated directly on a silicon platform. | David S.Sukhdeo Donguk Nam Ju-Hyung Kang Mark L.Brongersma Krishna C.Saraswat | 2014 | Photonics Research2014，2，3： | 5 |
| 2 | A High Dielectric N-Type Small Molecular Acceptor Containing Oligoethyleneglycol Side-Chains for Organic Solar Cellst显示文摘 | Bomee Jang Changyeon Lee Young Woong Lee Donguk Kim Mohammad Afsar Uddin Felix Sunjoo Kim Bumjoon J. Kim Han Young Woo | 2018 | Chinese Journal of Chemistry2018，36，3： | 3 |
| 3 | Clinical Outcomes of Patients with Microsatellite-Unstable Colorectal Carcinomas Depend on L1 Methylation Level显示文摘 | Ye-Young Rhee Mi Kim Jeong Bae Jae Koh Nam-Yun Cho Yong-Sung Juhnn Donguk Kim Gyeong Kang | 2012 | Annals of Surgical Oncology2012，，11： | 2 |
| 4 | The Effects of the Handset Cases,Battery and Human Head on the Performance of a Triple-band Internal Antenna显示文摘 | Sim Donguk Park Seongook | 2004 | IEEE Antennas and Propagation Society Symposium2004，，11： | 1 |
| 5 | A sweepline algorilhm for euclidean Voronoi diagram of circles显示文摘 | LI J DONGUK K LISEN M | 2006 | Computer-Aided De sign2006，38，3： | 1 |
| 6 | 再生粗骨料混凝土干燥收缩特性理论模型显示文摘为研究再生粗骨料混凝土的干燥收缩特性,收集了现有12项研究与32组收缩数据并进行了比较,试验时间跨度为41~480 d,分析参数包括水灰比(0.36~0.68)、普通混凝土抗压强度(27~60 MPa)、再生粗骨料替换率(20%~100%)、相对湿度(43%~65%)、湿养护时间(1~28 d)和测量收缩的时间(41~480 d);通过比较试验数据和理论预测结果,利用基于天然骨料混凝土干燥收缩试验数据的多个统计指标,评估了现有ACI 209R-92模型、Bazant-Baweja B3模型以及FIB MC2010模型;采用基于Fathifazl等研究的方法来评估混凝土的干燥收缩增量;通过上述选定模型来评估再生粗骨料混凝土的干燥收缩率的增量,并使用评价残差、欧洲国际混凝土委员会(CEB)变异系数、CEB均方差与CEB偏差等统计指标评价了试验数据。研究结果表明:当将已知收缩行为的天然骨料混凝土的部分或全部粗骨料替换为已知残留砂浆含量的再生粗骨料,可以最准确地预测总收缩的演变;通过将残余砂浆系数应用于天然骨料混凝土的实测收缩量,可以相对准确地预测再生骨料混凝土的收缩;当再生粗骨料混凝土的替代率为20%~33%时,残余砂浆系数为1.03~1.08,当再生粗骨料混凝土的替代率为50%时,残余砂浆系数为1.07~1.16,即再生骨料混凝土的干燥收缩率比天然骨料混凝土的干燥收缩率增加了约16%或更小;当再生粗骨料混凝土的替代率为100%时,残余砂浆系数为1.18~1.76;当天然骨料混凝土的替代率大于50%时,再生粗骨料混凝土的干燥收缩率的增加相比天然骨料混凝土的干燥收缩率的增加更明显。由此可见,当前的研究方法可用于利用扩展的数据库进一步改进再生粗骨料混凝土干燥收缩行为的理论预测。 | CHOI Donguk ENKBOLD Odontuya YANG Sungchul | 2022 | 交通运输工程学报2022，22，5： | 1 |
| 7 | Factors predicting the response to biofeedback-assisted pelvic floor muscle training for urinary incontinence 显示文摘 | Eun-Hee Yon Young-Mi Kim Donguk Kim | 2011 | International Juornal of Gynecology and Obstetrics2011，112，2： | 1 |
| 8 | Predictors of leiomyoma recurrence after laparoscopic myomectomy显示文摘 | Eun-Hee Yoo Paul I. Lee Chu-Yeop Huh Dong-Ho Kim Byung-Seok Lee Jae-Kwan Lee Donguk Kim | 2007 | The Journal of Minimally Invasive Gynecology2007，，6： | 1 |
| 9 | A sweepline algorithm for Euclidean Voronoi diagram of circles显示文摘 | HU S M JIN L DONGUK K | 2002 | Computer Aided Design2002，38，3： | 1 |
| 10 | Bile-Based Detection of Extrahepatic Cholangiocarcinoma with Quantitative DNA Methylation Markers and Its High Sensitivity显示文摘 | So-Hyun Shin Kyoungbun Lee Baek-Hui Kim Nam-Yun Cho Jin-Young Jang Yong-Tae Kim Donguk Kim Ja June Jang Gyeong Hoon Kang | 2012 | The Journal of Molecular Diagnostics2012，，3： | 1 |
| 11 | A sweepline algorithm for Euclidean Voronoi diagram of circles显示文摘 | Li Jin Donguk Kim Lisen Mu | 2006 | Comp Aided Design2006，38，： | 1 |
| 12 | Interface engineering of an electrospun nanofiber-based composite cathode for intermediate-temperature solid oxide fuel cells显示文摘Sluggish oxygen reduction reaction(ORR)kinetics are a major obstacle to developing intermediate-temperature solid-oxide fuel cells(IT-SOFCs).In particular,engineering the anion defect concentration at an interface between the cathode and electrolyte is important for facilitating ORR kinetics and hence improving the electrochemical performance.We developed the yttria-stabilized zirconia(YSZ)nanofiber(NF)-based composite cathode,where the oxygen vacancy concentration is controlled by varying the dopant cation(Y2O3)ratio in the YSZ NFs.The composite cathode with the optimized oxygen vacancy concentration exhibits maximum power densities of 2.66 and 1.51 W cm^(−2)at 700 and 600℃,respectively,with excellent thermal stability at 700℃ over 500 h under 1.0 A cm^(−2).Electrochemical impedance spectroscopy and distribution of relaxation time analysis revealed that the high oxygen vacancy concentration in the NF-based scaffold facilitates the charge transfer and incorporation reaction occurred at the interfaces between the cathode and electrolyte.Our results demonstrate the high feasibility and potential of interface engineering for achieving IT-SOFCs with higher performance and stability. | Seo Ju Kim Deokyoon Woo Donguk Kim Tae Kyeong Lee Jaeyeob Lee Wonyoung Lee | 2023 | International Journal of Extreme Manufacturing2023，5，1： | 0 |
| 13 | Optically pumped low-threshold microdisk lasers on a GeSn-on-insulator substrate with reduced defect density显示文摘Despite the recent success of GeSn infrared lasers,the high lasing threshold currently limits their integration into practical applications.While structural defects in epitaxial GeSn layers have been identified as one of the major bottlenecks towards low-threshold GeSn lasers,the effect of defects on the lasing threshold has not been well studied yet.Herein,we experimentally demonstrate that the reduced defect density in a GeSn-on-insulator substrate improves the lasing threshold significantly.We first present a method of obtaining high-quality GeSn-oninsulator layers using low-temperature direct bonding and chemical–mechanical polishing.Low-temperature photoluminescence measurements reveal that the reduced defect density in GeSn-on-insulator leads to enhanced spontaneous emission and a reduced lasing threshold by0 times andtimes,respectively.Our result presents a new path towards pushing the performance of GeSn lasers to the limit. | YONGDUCK JUNG DANIEL BURT LIN ZHANG YOUNGMIN KIM HYO-JUN JOO MELVINA CHEN SIMONE ASSALI OUSSAMA MOUTANABBIR CHUAN SENG TAN DONGUK NAM | 2022 | Photonics Research2022，10，6： | 0 |
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