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Analytical Study on Piezoelectric Effects on Exciton Dissociation

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Communications in Computational Physics 2016年第6期20卷 179-187页

作者： SeongMin Kim Jaewook Ha Hyeok Kim Jin-baek Kim The Office of the Theory&Modeling Based Design of Energy Harvesting(private lab) Maetan 3-dongYeongtong-guSuwon-siGyeonggi-do 443-373Korea Department of Chemistry Korea Advanced Institute of Science and TechnologyDaejeon 305-701Korea Photo-Electronic Hybrids Research Center Korea Institute of Science and TechnologySeoul 136-791Korea CAE Platform Technology LabSamsung Advanced Institute of Technology

We analytically and numerically compute the Onsager dissociation rate(exciton dissociation)on an interface induced by a piezoelectric potential in an inorganicorganic hybrid p-n junction system(ZnO+(poly(p-phenylene vinylene));PPV).When a positive piezoelectric potential is created at the interface region owing to the deformation of the system,free electrons accumulate at the ***,screening effects are *** is assumed that the electron layer formed at the interface then attracts free holes from the p-type PPV region,which leads to exciton formation,possibly via the Langevin recombination *** increased exciton density can then contribute to the Onsager dissociation rate,which is maximum around the *** paper focuses on the role of piezoelectric effects in promoting exciton formation at the interface and its relation with the exciton dissociation rate.

关键词： Exciton dissociation Onsager rate piezoelectric p-n junction recombination

Transcription factor IRF8 controls Thl-like regulatory T-cell function

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Cellular & Molecular Immunology 2016年第6期13卷 785-794页

作者： Wonyong Lee Hyeong Su Kim Song Yi baek Gap Ryol Lee Department of Life Science Sogang University 35 Baekbeom-ro Mapo-gu Seou1121-742 Korea

Recent studies have suggested that regulatory T （Treg） cells comprise a heterogeneous population that regulates various aspects of the immune response, and that Treg cells use the factors that are expressed in their target cells to regulate them. We searched for factors that regulate Thl response in Treg cells using a meta-analysis. In the process, we discovered that transcription factor interferon regulatory factor 8 （I RF8） was selectively expressed in Treg and Th I cells. IRF8-deficient Treg cells showed defective expression of CXCR3 and aberrant expression of the 114 and 1117genes. Upon treatment with alpha galactosyI-C18-ceramide （aGaI-C18-Cer）, IRF8-deficient mice showed defective Treg cell recruitment in the liver. Eliciting Thl immune response by anti-CD40 antibody injection in mice induced IRF8 expression in Treg cells. The expression of IRF8 was induced by Foxp3 in Treg cells, IRF8 had no effect on T-bet expression in Treg and vice versa. Thus, our results strongly suggest that IRF8 controls Thl immune response in Treg cells independent of T-bet.

关键词： CXCR3 IRF8 regulatory T cell Thl-like

Virtual Mold Technique in Thermal Stress Analysis during Casting Process

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Journal of Materials Science & Technology 2008年第3期24卷 359-363页

作者： Si-Young Kwak Jae-Wook baek Jeong-Ho Nam Jeong-Kil Choi E-Design Center Korea Institute of Industrial Technology Department of Virtual Engineering Korea University of Science & Technology

It is important to analyse the casting product and the mold at the same time considering thermal contraction of the casting and thermal expansion of the mold. The analysis considering contact of the casting and the mold induces the precise prediction of stress distribution and the defect such as hot tearing. But it is difficult to generate FEM mesh for the interface of the casting and the mold. Moreover the mesh for the mold domain spends lots of computational time and memory for the analysis due to a number of meshes. Consequently we proposed the virtual mold technique which only uses mesh of the casting part for thermal stress analysis in casting process. The spring bar element in virtual mold technique is used to consider the contact of the casting and the mold. In general, a volume of the mold is much bigger than that of casting part, so the proposed technique decreases the number of mesh and saves the computational memory and time greatly. In this study, the proposed technique was verified by the comparison with the traditional contact technique on a specimen. And the proposed technique gave satisfactory results.

关键词： Casting process Thermal stress analysis Virtual mold

Enhancing the efficiency and scalability of perovskite solar cells through pseudo-halide salt addition

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Journal of Materials Science & Technology 2023年第34期165卷 161-169页

作者： Dohun baek Geon Yeong Park Jeongbeom Cha Hyemi Na Dong Seok Ham Min Kim School of Chemical Engineering Future Energy Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Graduate School of Integrated Energy-AI Jeonbuk National UniversityJeonju 54896Republic of Korea Chemical Materials Solutions Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea

Organic-inorganic halide perovskites have significant potential for application in next-generation solar ***,their applications are limited by challenges associated with large-area processability and long-term stability owing to the presence of pinholes and defect ***,we incorporated cesium formate in a perovskite active layer using a sequential perovskite fabrication process to eliminate the defect sites of perovskites and improve the film processability via roll-to-roll(R2R)*** addition of cesium formate salt to the PbI2 layer influences the perovskite crystal formation behavior as well as increases the perovskite crystallinity and decreases the defect ***,cesium formate addition eliminated small PbI2 grains and smoothed the perovskite surface,resulting in a large crystal grain *** formate ions interact with the PbI2 component and passivate halide vacancy defects,reducing nonradiative recombination and improving charge ***,the treated perovskite films were highly stable in air,exhibiting improved efficiency retention over time and achieving a power conversion efficiency(PCE)of>22%compared to the ***,the additive-treated perovskite film was processed using the R2R method,achieving a high PCE of>14%with minimal hysteresis.

关键词： Perovskite Solar Cells Pseudo-halide ion Stability Roll-to-roll process

Memristive Devices Based on Two-Dimensional Transition Metal Chalcogenides for Neuromorphic Computing

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Nano-Micro Letters 2022年第4期14卷 29-58页

作者： Ki chang Kwon Ji Hyun baek Kootak Hong Soo Young Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and Science(KRISS)Daejeon 34133Republic of Korea Department of Materials Science and Engineering Institute of Green Manufacturing TechnologyKorea UniversitySeoul 02841Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Korea

Two-dimensional(2D)transition metal chalcogenides(TMC)and their heterostructures are appealing as building blocks in a wide range of electronic and optoelectronic devices,particularly futuristic memristive and synaptic devices for brain-inspired neuromorphic computing *** distinct properties such as high durability,electrical and optical tunability,clean surface,flexibility,and LEGO-staking capability enable simple fabrication with high integration density,energy-efficient operation,and high *** review provides a thorough examination of high-performance memristors based on 2D TMCs for neuromorphic computing applications,including the promise of 2D TMC materials and heterostructures,as well as the state-of-the-art demonstration of memristive *** challenges and future prospects for the development of these emerging materials and devices are also *** purpose of this review is to provide an outlook on the fabrication and characterization of neuromorphic memristors based on 2D TMCs.

关键词： Two-dimensional materials Memristors Neuromorphic computing Artificial synapses Transition metal chalcogenides

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采用轻压下技术减少板坯中心偏析

钢铁 2004年第Z1期39卷 286-288页

作者： Jemin Park Hong-gu Ryu seung-kwan baek Shin-Eon Kang Steel Making Department Gwangyang Works POSCO Steel Making Department Gwangyang Works POSCO Steel Making Department Gwangyang Works POSCO POSCO Research Laboratory

近来,为提高竞争力,提高API钢市场占有率,必须增加高质量API钢的产量,尽最大努力去满足消费者对产品质量的严格要求,尤其是生产耐酸钢.不仅要最大限度地控制钢中残留元素和夹杂物的含量,而且还要避免中心偏析.因此,POSCO正致力于开发生... 详细信息

近来,为提高竞争力,提高API钢市场占有率,必须增加高质量API钢的产量,尽最大努力去满足消费者对产品质量的严格要求,尤其是生产耐酸钢.不仅要最大限度地控制钢中残留元素和夹杂物的含量,而且还要避免中心偏析.因此,POSCO正致力于开发生产工艺,更新基础设备,以满足消费者的要求.在POSCO的Gwangyang工厂,由于受铸机条件限制,控制板坯中心偏析有一定难度.为了克服这一困难,Gwangyang工厂在1-3铸机上安装了动态轻压下设备.动态轻压下系统的操作条件处于优化阶段.轻压下设备上采用了动态二次冷却系统和热示踪模型,板坯中心偏析系数有了明显降低.

关键词：连铸轻压下二次冷却中心偏析

BRAF mutation in multiple primary cancer with colorectal cancer and stomach cancer

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Gastroenterology Report 2013年第1期1卷 70-74页

作者： seung-Hyun Lee Byung-Kwon Ahn Sung-Uhn baek Hee-Kyung chang Department of Surgery and Pathology Kosin University College of MedicineBusanKorea

Aims:Recently,BRAF mutation testing has been introduced as a marker in differentiating Lynch syndrome from sporadic colorectal cancers or in predicting colorectal cancers with worse *** with hereditary predisposition to cancer development are at an increased risk of developing multiple primary *** purpose of this study is to identify mutation in the BRAF gene in multiple primary cancers with colorectal cancer and stomach ***:BRAF mutation was analysed in 45 patients with colorectal cancer and stomach cancer,synchronously or ***:Mean age was 64.07 years(range:47–83 years).For the colorectal cancer,tumors were located at the sigmoid colon in eight patients(17.8%)and at the rectum in 22 patients(48.9%).Twenty-three patients(51.1%)had synchronous *** patients(8.9%)had family members with *** mutation was identified in three patients(6.7%).All three of these patients had metachronous *** colorectal cancers were located in the sigmoid colon(1 patient)and the rectum(2 patients).Conclusions:BRAF mutation rate was low in the multiple primary cancer with colorectal cancer and stomach *** only BRAF gene study,it was not possible to identify any correlation with family history of colorectal *** study means considering other genes–MSI,MSH2,MLH1,MSH6.

关键词： multiple primary cancer colorectal cancer stomach cancer BRAF mutation

Electroacupuncture for abdominal pain relief in patients with acute pancreatitis:A three-arm randomized controlled trial

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Journal of Integrative Medicine 2023年第6期21卷 537-542页

作者： Dong Kee Jang Jun Kyu Lee chan Yung Jung Kyung Ho Kim Ha Ra Kang Yeon Sun Lee Jong Hwa Yoon Kwang Ro Joo Min Kyu Chae Yong Hyeon baek Byung-Kwan Seo Sang Hyub Lee Chiyeon Lim Department of Internal Medicine Seoul Metropolitan Government Boramae Medical CenterSeoul National University College of MedicineSeoul 07061Republic of Korea Department of Internal Medicine Dongguk University Ilsan HospitalDongguk University College of MedicineGoyang 10326Republic of Korea Department of Acupuncture and Moxibustion Dongguk University Ilsan Oriental HospitalCollege of Korean MedicineDongguk UniversityGoyang 10326Republic of Korea Department of Korean Medicine Dongguk UniversityGoyang 10326Republic of Korea Department of Acupuncture and Moxibustion College of Korean MedicineDongguk UniversityGyeongju 38067Republic of Korea Department of Gastroenterology Kyung Hee University Hospital at GangdongSeoul 05278Republic of Korea Department of Acupuncture and Moxibustion Kyung Hee University Korean Medicine Hospital at GangdongSeoul 05278Republic of Korea Department of Internal Medicine and Liver Research Institute Seoul National University HospitalSeoul National University College of MedicineSeoul 03080Republic of Korea Department of Biostatistics College of MedicineDongguk UniversityGoyang 10326Republic of Korea

Background: Electroacupuncture(EA) may reduce the severity of acute pancreatitis(AP) and provide additional pain relief in patients with chronic pancreatitis. However, the ability of EA to relieve pain in patients with AP has not been well ***: This study was undertaken to compare the pain-relieving effects of EA and conventional treatment in patients with ***, setting, participants and interventions: This study was conducted using a randomized, controlled,three-arm, parallel-group and multi-center design. Patients diagnosed with AP were randomly and equally assigned to EA1, EA2 or control groups. All participants received conventional standard-of-care therapy for AP. Local EA alone was administered in EA1, and local plus distal EA was given in *** EA included two abdominal acupoints, while distal EA included twelve peripheral acupoints. EA groups underwent one session of EA daily for 4 days(days 1–4), or until pain was resolved or *** outcome measures: The primary outcome measure was the change in the visual analogue scale(VAS;0–100) pain score between baseline and day ***: Eighty-nine participants were randomized into EA1, EA2 and control groups, and 88(EA1, 30;EA2, 29;control, 29) were included in the full-analysis set. VAS score change(median [interquartile range]) on day 5 was(12.3 ± 22.5) in the EA1 group,(10.3 ± 21.5) in the EA2 group, and(8.9 ± 15.2) in the control group. There were not significant differences in the change in VAS score among treatments(P = 0.983). However, time to food intake was significantly shorter in the EA group(EA1 + EA2) than in the control group(median 2.0 days vs 3.0 days), with a hazard ratio of 0.581(P = 0.022;95% CI,0.366–0.924). No significant adverse events ***: EA treatment did not significantly reduce pain after 4 days of treatment in patients with AP-associated abdominal pain but significantly reduced time to first food intake.

关键词： Acute pancreatitis Electroacupuncture Pain management Abdominal pain Randomized controlled trial

Real-time multiaxial strain mapping using computer vision integrated optical sensors

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npj Flexible Electronics 2023年第1期7卷 253-264页

作者： Sunguk Hong Vega Pradana Rachim Jin-Hyeok baek Sung-Min Park Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea Department of Convergence IT Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea School of Interdisciplinary Bioscience and Bioengineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea Department of Electrical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673South Korea Institute of Convergence Science Yonsei UniversitySeoul 120-749South Korea

Soft strain sensors pose great potential for emerging human–machine ***,their real-world applications have been limited due to challenges such as low reproducibility,susceptibility to environmental noise,and short lifetimes,which are attributed to nanotechnologies,including microfabrication *** this study,we present a computer vision-based optical strain(CVOS)sensor system that integrates computer vision with streamlined microfabrication techniques to overcome these challenges and facilitate real-time multiaxial strain *** proposed CVOS sensor consists of an easily fabricated soft silicone substrate with micro-markers and a tiny camera for highly sensitive marker ***-time multiaxial strain mapping allows for measuring and distinguishing complex multi-directional strain patterns,providing the proposed CVOS sensor with higher *** results indicate that the proposed CVOS sensor is a promising approach for the development of highly sensitive and versatile human–machine interfaces that can operate long-term under real-world conditions.

关键词： computer mapping strain