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Enhanced photocatalytic degradation of lindane using metal–semiconductor Zn@ZnO and ZnO/Ag nanostructures

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Journal of Environmental Sciences 2018年第12期30卷 107-115页

作者： hyeon Jin jung Ravindranadh Koutavarapu Seulki Lee Ju Hyun Kim Hyun Chul choi Myong Yong choi Department of Chemistry (BK21+) and Research Institute of Natural Science Gyeongsang National University Department of Chemistry Chonnam National University

To achieve enhanced photocatalytic activity for the degradation of lindane, we prepared metal–semiconductor composite nanoparticles（NPs）. Zn@ZnO core–shell（CS） nanocomposites, calcined ZnO, and Ag-doped ZnO（ZnO/Ag） nanostructures were prepared using pulsed laser ablation in liquid, calcination, and photodeposition methods, respectively, without using surfactants or catalysts. The as-prepared catalysts were characterized by using X-ray diffraction（XRD）, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, ultraviolet–visible（UV–vis） spectroscopy, and photoluminescence spectroscopy. In addition, elemental analysis was performed by energy dispersive X-ray spectroscopy. The obtained XRD and morphology results indicated good dispersion of Zn and Ag NPs on the surface of the ZnO nanostructures. Investigation of the photocatalytic degradation of lindane under UV–vis irradiation showed that Zn@ZnO CS nanocomposites exhibit higher photocatalytic activity than the other prepared samples. The maximum degradation rate of lindane was 99.5% in 40 min using Zn@ZnO CS nanocomposites. The radical trapping experiments verified that the hydroxyl radical（·OH） was the main reactive species for the degradation of lindane.

关键词： Zn@ZnO ZnO/Ag Lindane Pulsed laser ablation in liquid Photocatalysis

Supercooling phenomena in protein based food matrix composed of various fat,salt,and water contents

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Food Bioscience 2023年第1期51卷 447-454页

作者： Dong hyeon Park Eun Jeong Kim Mi-jung choi Department of Food Science and Biotechnology of Animal Resources Konkuk UniversitySeoul05029Republic of Korea Refrigerator Research of Engineering Division Home Appliance and Air Solution CompanyLG ElectronicsChangwon51533Republic of Korea

Supercooling is recognized as a novel preservation method because it maintains the freshness of food without tissue damage caused by ice *** is a complicated matrix composed of several components with varying freezing points depending on the food *** this study,effects of food compositions on stability of supercooling preservation were investigated using a model food to define the interaction between supercooling maintenance and the factor of food ***,chicken meat(leg and wing)was used to confirm food freshness during extended *** higher the fat and salt content of the model food,better was the maintenance of the supercooled state;however,higher the moisture content,worse was the maintenance of supercooled *** presence of the fat layer affected the supercooling maintenance *** experiments with real food,the chicken leg and wing samples were 80%and 90%supercooled,*** samples conserved at superooling presented significantly lower drip loss,total volatile basic nitrogen,and total aerobic count than those of the *** addition,water holding capacity of supercooled samples were not significant differences compared to frozen samples.

关键词： Food composition Supercooling Freshness Chicken meats

Removal characteristics of CO_2 using aqueous MEA/AMP solutions in the absorption and regeneration process

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Journal of Environmental Sciences 2009年第7期21卷 907-913页

作者： Won-Joon choi Jong-Beom Seo Sang-Yong Jang Jong-hyeon jung Kwang-Joong Oh Greenhouse Gas Research Center Korea Institute of Energy Research Daejeon 305343 Korea Department of Environmental Engineering Pusan National University Busan 609735 Korea Department of Health Administration Sorabol College Gyeongju 780711 Korea

The carbon dioxide （CO2） removal efficiency, reaction rate, and CO2 loading into aqueous blended monoethanolamine （MEA）＋ 2-amino-2-methyl-l-propanol （AMP） solutions to enhance absorption characteristics of MEA and AMP were carried out by the absorption/regeneration process. As a result, compared to aqueous MEA and AMP solutions, aqueous blended MEA ＋ AMP solutions have a higher CO2 loading than MEA and a higher reaction rate than AMP. The CO2 loading of rich amine of aqueous 18 wt.% MEA ＋ 12 wt.% AMP solution was 0.62 mol CO2/mol amine, which is 51.2% more than 30 wt.% MEA （0.41 mol CO2/mol amine）. Consequently, blending MEA and AMP could be an effective way to design considering economical efficiency and used to operate absorber for a long time.

关键词： carbon dioxide monoethanolamine 2-amino-2-methyl-1-propanol absorption regeneration

Effect of supercooling storage applied with stepwise algorithm for fishes(salmon and olive flounder)and its freshness during extended storage

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Food Bioscience 2022年第5期49卷 774-782页

作者： Dong hyeon Park SangYoon Lee Yeong Mi Byeon Eun Jeong Kim Mi-jung choi Department of Food Science and Biotechnology of Animal Resources Konkuk UniversitySeoul05029South Korea Refrigerator Research of Engineering Division Home Appliance and Air Solution CompanyLG ElectronicsChangwon51533South Korea

Supercooling storage reduces the temperature of a product by lowering its freezing point without phase transition and may extend its shelf ***,it is difficult to maintain the supercooled state of food as it is thermodynamically metastable.A slow cooling rate and minimal fluctuation are essential for achieving stable supercooling ***,a stepwise algorithm was adopted for supercooling storage in this *** and olive flounder were stored at 3℃(refrigeration),􀀀18℃(freezing),and􀀀2℃(supercooling)for 12 *** were maintained in a supercooled state and unfrozen during the storage *** stored after the supercooling treatment were superior with respect to drip loss and water holding capacity(WHC)compared to frozen samples,regardless of the type of *** and total volatile basic nitrogen values of olive flounder was higher than those in salmon owing to the higher water and protein content in olive flounder than in ***,the supercooled samples inhibited the increase in trimethylamine and volatile basic nitrogen *** growth was ***,a stepwise algorithm for stable supercooled storage was achieved,which effectively preserved fish quality better than freezing and refrigeration storage.

关键词： Salmon Olive flounder Supercooling Stepwise algorithm Freshness

Influence of a UV-ozone treatment on amorphous SnO_(2) electron selective layers for highly efficient planar MAPbI3 perovskite solar cells

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Journal of Materials Science & Technology 2020年第24期59卷 195-202页

作者： Kyungeun jung Du hyeon Kim Jaemin Kim Sunglim Ko Jae Won choi Ki Chul Kim Sang-Geul Lee Man-Jong Lee Department of Advanced Technology Fusion Konkuk UniversitySeoul05029Republic of Korea a Department of Chemistry Konkuk UniversitySeoul05029Republic of Korea Department of Mechanical Design and Production Engineering Konkuk UniversitySeoul05029Republic of Korea Division of Chemical Engineering Konkuk UniversitySeoul05029Republic of Korea Daegu Center Korea Basic Science InstituteDaegu41566Republic of Korea

The effect of ultraviolet-ozone(UVO)irradiation on amorphous(am)SnO_(2) and its impact on the photoconversion efficiency of MAPbI3-based perovskite solar cells were investigated in *** treatment was found to increase the amount of chemisorbed oxygen on the am-SnO_(2) surface,reducing the surface energy and contact *** changes in the am-SnO_(2) surface lowered the Gibbs free energy for the densification of perovskite films and facilitated the formation of homogeneous perovskite *** addition,the Fermi energy of the UVO-treated am-SnO_(2) shifted upwards to achieve an ideal band offset for MAPbI3,which was verified by theoretical calculations based on the density functional *** achieved a champion efficiency of 19.01% with a statistical reproducibility of 17.01±1.34% owing to improved perovskite film densification and enhanced charge transport/extraction,which is considerably higher than the 13.78±2.15% of the ***,UVO-treated,am-SnO_(2)-based devices showed improved stability and less hysteresis,which is encouraging for the future application of up-scaled perovskite solar cells.

关键词： UV-ozone Amorphous SnO_(2) Electron selective layers Planar perovskite solar cells Hysteresis

Loose-fit graphitic encapsulation of silicon nanowire for one-dimensional Si anode design

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Journal of Materials Science & Technology 2017年第10期33卷 1120-1127页

作者： Seh-Yoon Lim Sudong Chae Su-Ho jung Yuhwan hyeon Wonseok Jang Won-Sub Yoon Jae-Young choi Dongmok Whang School of Advanced Materials Science and Engineering SKKU Advanced Institute of Nanotechnology Sungkyunkwan University Suwon 440-746 South Korea Department of Energy Sdence Sungkyunkwan University Suwon 440-746 South Korea

Silicon nanowires（SiNWs） encapsulated with graphene-like carbon sheath（GS） having a void space in between（SiNW@V@GS） are demonstrated for the improved electrochemical performance of Si anode in lithium ion battery. The Si NW@V@GS structure was synthesized by a scalable fabrication method including four successive reactions： metal-catalyzed CVD growth of Si NWs, controlled thermal oxidation, and deposition of the graphitic layer, to form Si NW@SiO2@GS and additional chemical etching of sacrificial SiO2 layer between Si NWs and carbon sheath. During the synthetic process, the thickness of the void spacing was controlled by adjusting the oxidation-dependent process. The well-controlled void space and crystalline graphitic carbon sheath of the SiNW@V@GS structure enable good reversible capacity of1444 m Ahg^（-1） and cycling stability of 85% over 150 cycles.

关键词： Lithium ion battery Silicon nanowire Graphene Void spacing Anode

Single-cell RNA sequencing of mitoticarrested prospermatogonia with DAZL::GFP chickens and revealing unique epigenetic reprogramming of chickens

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Journal of Animal Science and Biotechnology 2022年第5期13卷 1305-1325页

作者： hyeon Jeong choi Kyung Min jung Deivendran Rengaraj Kyung Youn Lee Eunhui Yoo Tae Hyun Kim Jae Yong Han Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences Seoul National UniversitySeoul 08826South Korea Department of Animal Science Pennsylvania State UniversityState CollegePA 16801USA

Background:Germ cell mitotic arrest is conserved in many vertebrates,including birds,although the time of entry or exit into quiescence phase *** arrest is essential for the normal differentiation of male germ cells into spermatogonia and accompanies epigenetic reprogramming and meiosis inhibition from embryonic development to ***,mitotic arrest was not well studied in chickens because of the difficulty in obtaining pure germ cells from relevant developmental ***:We performed single-cell RNA sequencing to investigate transcriptional dynamics of male germ cells during mitotic arrest in DAZL::GFP *** differentially expressed gene analysis and K-means clustering to analyze cells at different developmental stages(E12,E16,and hatch),we found that metabolic and signaling pathways were regulated,and that the epigenome was reprogrammed during mitotic *** particular,we found that histone H3K9 and H3K14 acetylation(by HDAC2)and DNA demethylation(by DNMT3B and HELLS)led to a transcriptionally permissive chromatin ***,we found that global DNA demethylation occurred gradually after the onset of mitotic arrest,indicating that the epigenetic-reprogramming schedule of the chicken genome differs from that of the mammalian *** hypomethylation persisted after hatching,and methylation was slowly re-established 3 weeks ***:We found a unique epigenetic-reprogramming schedule of mitotic-arrested chicken prospermatogonia and prolonged hypomethylation after *** will provide a foundation for understanding the process of germ-cell epigenetic regulation in several species for which this process is not clearly *** findings on the biological processes related to sex-specific differentiation of prospermatogonia could help studying germline development in vitro more elaborately.

关键词： DAZL::GFP chickens DNA methylation Epigenetic reprogramming Histone acetylation Male germ cell Mitotic arrest Prospermatogonia Single-cell RNA sequencing

CoolVox:Advanced 3D convolutional neural network models for predicting solar radiation on building facades

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Building Simulation 2022年第5期15卷 755-768页

作者： jung Min Han Eun Seuk choi Ali Malkawi Harvard University Graduate School of Design CambridgeUSA Harvard Center for Green Buildings and Cities CambridgeUSA Harvard John A.Paulson School of Engineering and Applied Sciences CambridgeUSA

Data-driven models have become increasingly prominent in the building,architecture,and construction *** area ideally suited to exploit this powerful new technology is building performance ***-based models have traditionally been used to estimate the energy flow,air movement,and heat balance of ***,physics-based models require many assumptions,significant computational power,and a considerable amount of time to output *** neural networks(ANNs)with prefabricated or simulated data are likely to be a more feasible option for environmental analysis conducted by designers during the early design *** ANNs require fewer inputs and shorter computation times and offer superior performance and potential for data augmentation,they have received increased attention for predicting the surface solar radiation on ***,ANNs can provide innovative and quick design solutions,enabling designers to receive instantaneous feedback on the effects of a proposed change to a building's *** research introduces deep learning methods as a means of simulating the annual radiation intensities and exposure level of buildings without the need for physics-based *** propose the CoolVox model to demonstrate the feasibility of using 3D convolutional neural networks to predict the surface radiation on building *** CoolVox model accurately predicted the radiation intensities of building facades under different boundary conditions and performed better than ARINet(with average mean square errors of 0.01 and 0.036,respectively)in predicting the radiation intensity both with(validation error=0.0165)and without(validation error=0.0066)the presence of boundary buildings.

关键词： artificial neural networks 3D convolutional neural networks solar radiation simulation building performance simulation

Effect of serum testosterone and percent tumor volume on extra-prostatic extension and biochemical recurrence after laparoscopic radical prostatectomy

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Asian Journal of Andrology 2016年第1期18卷 54-59页

作者： Eu Chang Hwang Seong hyeon Yu Yang Hyun Jo Seung I1 jung Taek Won Kang Dong Deuk Kwon Chan choi Suk Hee Heo Jun Eul Hwang Sung-Hoon jung Tae-Young jung Department of Urology Chonnam National University Medical School Gwangju Republic of Korea Department of Pathology Chonnam National University Medical School Gwangju Republic of Korea Department of Radiology Chonnam National University Medical School Gwangju Republic of Korea Department of Hemato-oncology Chonnam National University Medical School Gwangju Republic of Korea Department of Neurosurgery Chonnam National University Medical Schoo Gwangju Republic of Korea

Several studies have revealed that the preoperative serum testosterone and percent tumor volume （PTV） predict extra-prostatic extension （EPE） and biochemical recurrence （BCR） after radical prostatectomy. This study investigated the prognostic significance of serum testosterone and PTV in relation to EPE and BCR after laparoscopic radical prostatectomy （LRP）. We reviewed 520 patients who underwent LRP between 2004 and 2012. PTV was determined as the sum of all visually estimated tumor foci in every section. BCR was defined as two consecutive increases in the postoperative prostate-specific antigen （PSA）〉0.2 ng ml^-1. The threshold for serum total testosterone was 3.0 ng ml^-1, Multivariate logistic regression was used to define the effect of variables on the risk of EPE and BCR. A low serum testosterone （〈3.0 ng ml^-1） was associated with a high serum PSA, Gleason score, positive core percentage of the prostate biopsy, PTV, and all pathological variables. On multivariate analysis, similar to previous studies, the serum PSA, biopsy positive core percentage, Gleason score, and pathological variables predicted EPE and BCR. In addition, low serum testosterone （〈3.0 ng ml^-1, adjusted OR, 8.52; 95% CI, 5.04-14.4, P = 0.001） predicted EPE and PTV （adjusted OR, 1.02; 95% CI, 1.01-1.05, P = 0.046） predicted BCR. In addition to previous predictors of EPE and BCR, low serum testosterone and PTV are valuable predictors of EPE and BCR after LRP.

关键词： biochemical recurrence extra-prostatic extension prostate neoplasms prostatectomy testosterone tumor burden