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Colored ultrathin hybrid photovoltaics with high quantum efficiency

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Light(Science & Applications) 2014年第1期3卷 36-42页

作者： kyu-tae Lee Jae Yong Lee Sungyong Seo L Jay Guo Department of Electrical Engineering and Computer Science The University of MichiganAnn ArborMichigan 48109USA

Most current solar panels are fabricated via complex processes using expensive semiconductor materials,and they are rigid and heavy with a dull,black *** a result of their non-aesthetic appearance and weight,they are primarily installed on rooftops to minimize their negative impact on building *** large surfaces and interiors of modern buildings are not efficiently utilized for potential electric power ***,we introduce dual-function solar cells based on ultrathin dopant-free amorphous silicon embedded in an optical cavity that not only efficiently extract the photogenerated carriers but also display distinctive colors with the desired angle-insensitive ***-energy-harvesting colored signage is ***,a cascaded photovoltaics scheme based on tunable spectrum splitting can be employed to increase power efficiency by absorbing a broader band of light *** study pioneers a new approach to architecturally compatible and decorative thin-film photovoltaics.

关键词： color filters nanocavities organic–inorganic nanostructures photovoltaics spectrum splitting

High-performance colorful semitransparent perovskite solar cells with phase-compensated microcavities

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Nano Research 2018年第5期11卷 2553-2561页

作者： kyu-tae Lee Ji-Yun Jang Na Young Ha Soonil Lee Hui Joon Park Department of Materials Science and Engineering University of Illinois Urbana Illinois 61801 USA Department of EnergySystems Research Ajou University Suwon 16499 Republic of Korea Department of Electrical and Computer Engineering Ajou University Suwon 16499 Republic of Korea

We demonstrate highly efficient multi-colored semitransparent perovskite solar cells that can create high angular tolerant controllable transmissive colors up to 60~, based on phase-compensated microcavities. The efficiency of the semitransparent colors was improved by impedance matching, which was enabled by placing a dielectric functional layer on top of traditional optical microcavities, with negligible influence on color pureness. The vast majority of the visible part of solar radiation is efficiently utilized for solar energy harvesting, achieving 10.47%, 10.66%, and 11.18% of efficiency for red, green, and blue （RGB） colored solar cells, respective136 while a very small proportion of the visible solar spectrum is used for structural coloration that can be readily tuned by altering the cavity medium thickness. The approach described herein can be suitable for a variety of applications such as display systems with ultra-low power consumption, highly efficient colorful solar panels, low-power wearable electronics, and energy-efficient optoelectronics.

关键词： perovskite solar cells semitransparency color filters optical cavities

Decorative near-infrared transmission filters featuring high-efficiency and angular-insensitivity employing ID photonic crystals

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Nano Research 2019年第3期12卷 543-548页

作者： Chengang Ji Chenying Yang Weidong Shen kyu-tae Lee Yueguang Zhang Xu Liu L.Jay Guo Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor Michigan 48109 USA State Key Laboratory of Modern Optical Instrumentation Department of Optical Engineering Zhejiang University Hangzhou 310027 China Department of Physics Inha University Incheon 22212 Republic of Korea

We present a new scheme for visibly-opaque but near-infrared-transmitting filters involving 7 layers based on one-dimensional ternary photonic crystals, with capabilities in reaching nearly 100% transmission efficiency in the near-infrared region. Different decorative reflection colors can be created by adding additional three layers while maintaining the near-infrared transmission performance. In addition, our proposed structural colors show great angular insensitivity up to ±60° for both transverse electric and transverse magnetic polarizations, which are highly desired in various fields. The facile strategy described here involves a simple deposit!on method for the fabrication, thereby having great potential in diverse applications such as image sensors, anti-counterfeit tag, and optical measurement systems.

关键词： near-infrared (NIR)-transmitting filters colored decorations photonic crystals multilayer structures

Spin Self-Assembled Clay Nanocomposite Passivation Layers Made from a Photocrosslinkable Poly（vinyl alcohol） and Na^-Montmorillonite Enhance the Environmental Stability of Organic Thin-Film Transistors

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Chinese Journal of Chemistry 2016年第11期34卷 1103-1108页

作者： Hayoung Jeon Seonuk Park Sooji Nam Kwonwoo Shin Sung-Ryong Kim Se Hyun Kim Jaeyoung Jang tae kyu an POSTECH Organic Electronics Laboratory Polymer Research Institute Department of Chemical Engineering Pohang University of Science and Technology Pohang 790-784 Republic of Korea Smart I/O Control Device Research Section Electronics and Telecommunications Research Institute Daejeon 305- 700 Republic of Korea Nano Materials & Components Research Center Korea Electronics Technology Institute (KET1) Seongsam-si Gyeonggi-do 13509 Republic of Korea Department of Polymer Science & Engineering Korea National University of Transportation 50 Daekak-Ro Chungju 27469 Republic of Korea School of Chemical Engineering Yeungnam University 280 Daehak-Ro Gyeongsan Gyeongbuk 38541 Republic of Korea Department of Energy Engineering Hanyang University Seoul 133-791 Republic of Korea

We investigated the effects of the multilayer polymer-clay nanohybrid passivation films on the stability of pentacene organic thin-film transistors （OTFTs） exposed to air and UV irradiation. Well-ordered multilayer films were deposited by the spin-assisted layer-by-layer assembly method using photocrosslinkable poly（vinyl alcohol） with the N-methyl-4（4＇-formylstyryl）pyridinium methosulfate acetal group （SbQ-PVA） and Na＋-montmorillonite in a water-based solution process. When photocrosslinked, these SbQ-PVA/clay multilayers were found to serve as excellent barriers to 02 and UV-light. Moreover, when used as passivation layers, they enhanced the stability of pen- tacene OTFT devices exposed to air and UV radiation.

关键词： polymer-clay passivation layer-by-layer montmorillonite long-term stability

Communication Architecture for AUV Test-Bed Using ACE/TAO Real-Time Event Channel

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Communication Architecture for AUV Test-Bed Using ACE/TAO Re...

Gene Expression Profiling of Human Myeloid Leukemic MV4-11 Cells Treated with 5-Aza-2’-deoxycytidine

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作者： Binugroho Eko Henfri Ha tae kyu Seo Young Bong Choi Jae Weon Department of Intelligent Mechanical Engineering Pusan National University Innovation Center for Engineering Education Pusan National University School of Mechanical Engineering Pusan National University

ISBN: (纸本)9787900719706

This paper presents ACE/TAO Real-time Event Channel(RTEC) as a middleware platform for enabling control and communication in the AUV test bed *** paper focuses on the communication architecture in order to provide real-time data transfer among components at AUV test-bed within even channel *** combining several services at RTEC like event scheduling and event filtering,data transfer can be threaded at different Quality of Services(QoS) to meet with system requirements.

关键词： Real-time event channel Event scheduling event filtering QoS

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Journal of Cancer Therapy 2012年第3期3卷 177-182页

作者： kyu-tae Kim David Mossman Donald Small Rodney J. Scott Division of Genetics Hunter Area Pathology Service John Hunter Hospital New Lambton Australia School of Biomedical Sciences and Pharmacy Faculty of Health University of Newcastle Callaghan Australia School of Medicine Johns Hopkins University Baltimore USA

The pyrimidine analog, 5-aza-2’-deoxycytidine (5-aza-dC) is a DNA methyltransferase inhibitor that triggers DNA demethylation leading to the reactivation of epigenetically silenced tumor suppressor genes. To understand the shift in gene expression which mediates the beneficial 5-aza-dC effects in leukemia, we have treated human myeloid derived leukemic cells with 5-aza-dC. Target genes were identified first in MV4-11 cells using a genome-wide gene expression profiling assay to detect differences in treated and untreated cells. From this analysis six genes were identified (HOXA4, HOXD4, HOXA8, HOXD12, CD9 and RGS2) as being significantly different expressed after treatment. To validate microarray data, we performed quantitative PCR on these genes from multiple leukemic cells. The results suggest that these genes are epigenetically regulated indicating that dysregulation of HOXA4, HOXD4, HOXA8, HOXD12, CD9 and RGS2 expression may play an important role in establishing the malignant phenotype in AML.

关键词： 5-Aza-2’-deoxycytidine Gene Expression Profile HOX CD9 RGS2

Development of Advanced Radiation Resistant ODS Steel for Fast Reactor System Applications

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World Journal of Engineering and Technology 2015年第3期3卷 125-128页

作者： tae kyu Kim Sanghoon Noh Suk Hoon Kang Hyun Ju Jin Ga Eon Kim Nuclear Materials Development Division Korea Atomic Energy Research Institute Daejeon Republic of Korea

A sodium-cooled fast reactor (SFR) is being developed at the Korea Atomic Energy Research Institute (KAERI). As in-core structural material for a SFR, advanced radiation resistant ODS steel (ARROS) has been developed. This paper summarizes the current status of ARROS development regarding an ODS steel composition, fabrication technology of ODS steel structural components and key joining technologies of ODS steel structural components.

关键词： SFR ODS ARROS Cladding Tube Joining

Middle cerebral artery occlusion methods in rat versus mouse model of transient focal cerebral ischemic stroke

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Neural Regeneration Research 2014年第7期9卷 757-758页

作者： Seunghoon Lee Minkyung Lee Yunkyung Hong Jinyoung Won Youngjeon Lee Sung-Goo Kang kyu-tae Chang Yonggeun Hong Department of Rehabilitation Science Graduate School of Inje University Ubiquitous Healthcare & Anti-aging Research Center Inje University Cardiovascular & Metabolic Disease Center Inje University National Primate Research Center (NPRC) Korea Research Institute of Bioscience and Biotechnology (KRIBB) Ochang School of Biological Sciences College of Biomedical Science & Engineering Inje University Department of Physical Therapy Graduate School of Inje University

Experimental stroke research commonly employs focal cerebral ischemic rat models （Bederson et al., 1986a; Longa et al., 1989）. In human patients, ischemic stroke typically results from thrombotic or embolic occlusion of a major cerebral artery, usually the mid- dle cerebral artery （MCA）. Experimental focal cerebral ischemia models have been employed to mimic human stroke （Durukan and Tatlisumak, 2007）. Rodent models of focal cerebral ischemia that do not require craniotomy have been developed using intraluminal suture occlusion of the MCA （MCA occlusion, MCAO）（Rosamond et al., 2008）. Furthermore, mouse MCAO models have been wide- ly used and extended to genetic studies of cell death or recovery mechanisms （Liu and McCullough, 2011）. Genetically engineered mouse stroke models are particularly useful for evaluation of isch- emic pathophysiology and the design of new prophylactic, neuro- protective, and therapeutic agents and interventions （Armstead et al., 2010）. During the past two decades, MCAO surgical techniques have been developed that do not reveal surgical techniques for mouse MCAO model engineering. Therefore, we compared MCAO surgical methods in rats and mice.

关键词： MCAO CCA Middle cerebral artery occlusion methods in rat versus mouse model of transient focal cerebral ischemic stroke

Melatonin combined with exercise cannot alleviate cerebral injury in a rat model of focal cerebral ischemia/reperfusion injury

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Neural Regeneration Research 2012年第13期7卷 993-999页

作者： Seunghoon Lee Jinhee Shin Minkyung Lee Yunkyung Hong Sang-Kil Lee Youngjeon Lee Tserentogtokh Lkhagvasuren Dong-Wook Kim Young-Ae Yang kyu-tae Chang Yonggeun Hong Department of Rehabilitation Science in Interdisciplinary Ph.D.Program Inje UniversityGimhae 621-749Republic of Korea Cardiovascular & Metabolic Disease Center College of Biomedical Science & EngineeringGimhae 621-749Republic of Korea Department of Smart Foods & Drugs School of Food & Life SciencesInje UniversityGimhae 621-749Republic of Korea Department of Pharmaceutical Engineering College of EngineeringInje UniversityGimhae 621-749Republic of Korea National Primate Research Center Korea Research Institute of BiotechnologyOchang 363-883Republic of Korea

Previous studies have demonstrated that melatonin combined with exercise can alleviate secondary damage after spinal cord injury in rats. Therefore, it is hypothesized that melatonin combined with exercise can also alleviate ischemic brain damage. In this study, adult rats were subjected to right middle cerebral artery occlusion after receiving 10 mg/kg melatonin or vehicle subcutaneously twice daily for 14 days. Forced exercise using an animal treadmill was performed at 20 m/min for 30 minutes per day for 6 days prior to middle cerebral artery occlusion. After middle cerebral artery occlusion, each rat received melatonin combined with exercise, melatonin or exercise alone equally for 7 days until sacrifice. Interestingly, rats receiving melatonin combined with exercise exhibited more severe neurological deficits than those receiving melatonin or exercise alone. Hypoxia-inducible factor la mRNA in the brain tissue was upregulated in rats receiving melatonin combined with exercise. Similarly, microtubule associated protein-2 mRNA expression was significantly upregulated in rats receiving melatonin alone. Chondroitin sulfate proteoglycan 4 （NG2） mRNA expression was significantly decreased in rats receiving melatonin combined with exercise as well as in rats receiving exercise alone. Furthermore, neural cell loss in the primary motor cortex was significantly reduced in rats receiving melatonin or exercise alone, but the change was not observed in rats receiving melatonin combined with exercise. These findings suggest that excessive intervention with melatonin, exercise or their combination may lead to negative effects on ischemia/reperfusion-induced brain damage.

关键词： wfocal cerebral ischemiaJreperfusion melatonin exercise neurological function brain tissue loss microtubule associated protein-2 chondroitin sulfate proteoglycan 4 NG2 hypoxia-inducible factor1 alpha neural regeneration