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Crystallographically vacancy‐induced MOF nanosheet as rational single‐atom support for accelerating CO_(2)electroreduction to CO

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Carbon Energy 2024年第8期6卷 49-62页

作者： Jin Hyuk cho Joonhee Ma Chaehyeon Lee Jin Wook Lim Youngho Kim Ho Yeon Jang Jaehyun Kim Myung‐gi seo Youngheon choi Youn Jeong Jang Sang Hyun Ahn Ho won Jang seoin Back Jong‐Lam Lee Soo Young Kim Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea Lotte Chemical R&D Center DaejeonRepublic of Korea Department of Chemical Engineering Hanyang UniversitySeoulRepublic of Korea School of Chemical Engineering and Material Science Chung‐Ang UniversitySeoulRepublic of Korea

To attain a circular carbon economy and resolve CO_(2)electroreduction technology obstacles,single‐atom catalysts(SACs)have emerged as a logical option for electrocatalysis because of their extraordinary catalytic *** SACs,metal–organic frameworks(MOFs)have been recognized as promising support materials because of their exceptional ability to prevent metal *** study shows that atomically dispersed Ni single atoms on a precisely engineered MOF nanosheet display a high Faradaic efficiency of approximately 100%for CO formation in H‐cell and three‐compartment microfluidic flow‐cell reactors and an excellent turnover frequency of 23,699 h−1,validating their intrinsic catalytic *** results suggest that crystallographic variations affect the abundant vacancy sites on the MOF nanosheets,which are linked to the evaporation of Zn‐containing organic linkers during ***,using X‐ray absorption spectroscopy and density functional theory calculations,a comprehensive investigation of the unsaturated atomic coordination environments and the underlying mechanism involving CO^(*)preadsorbed sites as initial states was possible and provided valuable insights.

关键词： 2‐dimensional material carbon dioxide reduction metal-organic frameworks single‐atom catalysts vacancy sites

Realizing High Thermoelectric Performance in n-Type Se-Free Bi2Te3 Materials by Spontaneous Incorporation of FeTe2 Nanoinclusions

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Energy & Environmental Materials 2024年第4期7卷 344-354页

作者： Jamil Ur Rahman Woo Hyun Nam Yong-Jae Jung Jong Ho won Jong-Min Oh Nguyen Van Du Gul Rahman Víctor M.García-Suárez Ran He Kornelius Nielsch Jung Young cho won-seon seo Jong Wook Roh Sang-il Kim Soonil Lee Kyu Hyoung Lee Hyun Sik Kim Weon Ho Shin Leibniz Institute for Solid State and Materials Research Advanced Materials Convergence R&D Division Korea Institute of Ceramic Engineering & Technology Department of Electronic Materials Engineering Kwangwoon University Department of Energy Engineering Dankook University Faculty of Fundamental Science Phenikaa University Department of Physics Quaid-i-Azam University Departamento de Física Universidad de Oviedo Nanomaterials and Nanotechnology Research Center-CINN Department of Materials Science and Engineering Yonsei University School of Nano & Materials Science and Engineering Kyungpook National University Department of Materials Science and Engineering University of Seoul School of Materials Science and Engineering Changwon National University

Bi2Te3-based materials have drawn much attention from the thermoelectric community due to their excellent thermoelectric performance near room ***,the stability of existing n-type Bi2（Te,Se）3materials is still low due to the evaporation energy of Se (37.70 kJ mol-1) being much lower than that of Te (52.55 kJ mol-1).The evaporated Se from the material causes problems in interconnects of the module while degrading the efficiency.

关键词： Bi2Te3 energy harvesting FeTe2 nanoinclusion n-type materials thermoelectric

Changes in microorganisms and metabolites during long-term fermentation of commercially manufactured anchovy sauce

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Food Science and Human Wellness 2024年

作者： Daehyeon Kim seong-Eun Park Eun-Ju Kim Seung-Ho seo Kwang-Moon cho Sun Jae Kwon Hong-seok Son Department of Biotechnology， College of Life Sciences and Biotechnology， Korea University Sonlab Inc. 3. AccuGene Inc.

This study was performed to investigate the changes in microbial communities and metabolites during the long-term fermentation of commercially manufactured anchovy sauce. Samples of commercial anchovy sauce were collected from large-scale fermentation tanks with fermentation periods of up to 7.87 years. The complex bacterial community was simplified to two genera， Tetragenococcus and Halanaerobium， after approximately 0.55 years of fermentation. Although genera， such as Saccharomyces， Cladosporium， Candida， and Aspergillus， were relatively dominant， no clear pattern was identified in fungal community analysis. The longitudinal metabolite profile demonstrated that approximately half (55.8%) of the metabolites present in anchovy sauce were produced within a year of fermentation due to rapid fermentation. Despite the static microbial community， the contents of several metabolites including amino acids and biogenic amines changed continuously during the long-term fermentation of anchovy sauce. This study provides novel insights into the changes in microbiota and metabolites in fish sauce produced without any starter inoculation.

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Development of Preliminary Design Program for Combustor of Regenerative Cooled Liquid Rocket Engine

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Journal of Thermal Science 2011年第5期20卷 467-473页

作者： won Kook cho Woo seok seol Min Son Min Kyo seo Jaye Koo Korea Aerospace Research Institute DaejoenRepublic of Korea Graduate Student Korea Aerospace UniversityGoyangRepublic of Korea School of Aerospace and Mechanical Engineering Korea Aerospace UniversityGoyangRepublic of Korea

An integrated program was established to design a combustor for a liquid rocket engine and to analyze regenerative cooling results on a preliminary design *** of burnt gas from a kerosene-LOx mixture in the combustor and rocket performance were calculated from CEA which is the code for the calculation of chemical *** heat transfer of regenerative cooling was analyzed by using SUPERTRAPP code for coolant properties and by one-dimensional correlations of the heat transfer coefficient from the combustor liner to the *** of the combustors of F-1 and RS-27A engines were designed from similar input data and the present results were compared to actual data for ***,the combustors of 30 tonf class,75 tonf class and 150 tonf class were designed from the required thrust,combustion chamber,exit pressure and mixture ratio of *** wall temperature,heat flux and pressure drop were calculated for heat transfer analysis of regenerative cooling using the profiles.

关键词： Liquid rocket engine Preliminary design of Combustor Regenerative cooling

Reinforced CNN Forensic Discriminator to Detect Document Forgery by DCGAN

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Computers, Materials & Continua 2022年第6期71卷 6039-6051页

作者： seo-young Lim Jeongho cho Department of Electrical Engineering Soonchunhyang UniversityAsan31538Korea

Recently,the technology of digital image forgery based on a generative adversarial network(GAN)has considerably improved to the extent that it is difficult to distinguish it from the original image with the naked eye by compositing and editing a person’s face or a specific part with the original ***,much attention has been paid to digital image forgery as a social ***,document forgery through GANs can completely change the meaning and context in a document,and it is difficult to identify whether the document is forged or not,which is ***,few studies have been conducted on document forgery and new forgery-related attacks have emerged ***,in this study,we propose a novel convolutional neural network(CNN)forensic discriminator that can detect forged text or numeric images by GANs using CNNs,which have been widely used in image classification for many *** strengthen the detection performance of the proposed CNN forensic discriminator,CNN was trained after image preprocessing,including salt and pepper as well asGaussian ***,we performed CNN optimization to make existing CNN more suitable for forged text or numeric image detection,which have mainly focused on the discrimination of forged faces to *** test evaluation results using Hangul texts and numbers showed that the accuracy of forgery discrimination of the proposed method was significantly improved by 20%in Hangul texts and 5%in numbers compared with that of existing state-of-the-art methods,which proved the proposed model performance superiority and verified that it could be a useful tool in reducing crime potential.

关键词： Digital forensics CNN GAN discriminator image processing

Efficient L-band ASE Generation Using a C/L-Band Coupler, an Optical Mirror and a FBG

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光学学报 2003年第S1期23卷 495-496页

作者： Seungtaek Kim Heuiseok Kang Kang-won Lee Yong-Gon seo Youngjune cho Korea Institute of Industrial Technology 35-3 IbJang HongCheon CheonAn ChungNam ROKKorea Institute of Industrial Technology 35-3 IbJang HongCheon CheonAn ChungNam ROKKorea Institute of Industrial Technology 35-3 IbJang HongCheon CheonAn ChungNam ROKKorea Electronics Technology Institute Pyungtaek KyungGi ROKKorea Institute of Industrial Technology 35-3 IbJang HongCheon CheonAn ChungNam ROK

A new structure for efficient and cost-effective L-band amplified spontaneous emission (ASE) generation was experimentally investigated and demonstrated using a C/L-band coupler, an optical mirror, and a fiber Bragg grating (FBG). The proposed structure has about 1.5 dB increase of the power around 1570 nm compared with conventional one. Various structures for power enhancement were also considered.

关键词： ASE EDF of into as In Efficient L-band ASE Generation Using a C/L-Band Coupler an Optical Mirror and a FBG

Three-dimensional free view reconstruction in axially distributed image sensing

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Chinese Optics Letters 2017年第8期15卷 40-43页

作者： chang-taek seo shin-won kang myungjin cho 3d display components support center gumi electronics and information technology research instituteGumi-siGyeongsangbuk-do 730-853Korea school of electronics engineering college of it engineeringkyungpook national universityDaegu 702-701Korea department of electrical electronicand control engineeringiitchankyong national university327 Chungang-roAnseong-siGyonggi-do 456-749Korea

Three-dimensional （3D） acquisition has been the most important technique for augmented reality or virtual reality industries. Stereo vision can obtain 3D infor- mation of objects using disparity between two images captured by a stereo camera. However, due to lack of per- spectives for 3D objects in this technique, accurate 3D information may not be generated and the number of viewing points is limited. By contrast, multi-view or super multi-view imaging techniques can obtain more accurate 3D information because they use multiple cameras for pickup of 3D objects so that more perspec- tives and viewing points of 3D objects can be recorded.

关键词： view free Three-dimensional free view reconstruction in axially distributed image sensing

Effect of barley straw biochar application on greenhouse gas emissions from upland soil for Chinese cabbage cultivation in short-term laboratory experiments

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Journal of Mountain Science 2016年第4期13卷 693-702页

作者： Se-won KANG Dong-Cheol seo Yong-Hwa CHEONG Ju-Wang PARK Jong-Hwan PARK Hang-won KANG Ki-Do PARK Yong Sik OK Ju-Sik cho Department of Medicinal & Industrial Crops Korea National College of Agriculture and Fisheries Division of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Sciences Gyeongsang National University Department of Bio-environmental Sciences Sunchon National University National Institute of Crop Science Rural Development Association Korea Biochar Research Center & Department of Biological Environment Kangwon National University

Chinese cabbage was cultivated in upland soil with the addition of biochar in order to investigate the potential for reduction of greenhouse gas emissions. Barley straw biochar(BSB) was introduced in a Wagner pot(1/5000a) in amounts of 0(BSB0, control), 100(BSB100), 300(BSB300), and 500(BSB500) kg 10a^(-1). After the addition of BSB into the upland soil, carbon dioxide(CO_2) emission increased while methane(CH_4) and nitrous oxide(N_2O) emissions decreased. The highest CO2 flux was measured for the BSB500 sample,(84.6 g m^(-2)) followed by BSB300, BSB100, and BSB0 in decreasing order. Relative to those of control, the total CH_4 flux and N_2O flux for the BSB500 treatment were lower by 31.6% and 26.1%, respectively. The global warming potential(GWP) of the treatment without biochar was 281.4 g CO_2 m-2 and those for treatments with biochar were in the range from 194.1 to 224.9 g CO_2 m^(-2). Therefore, introducing BSB into upland soil to cultivate Chinese cabbages can reduce the global warming potential.

关键词： Biochar Carbon dioxide Methane Nitrous oxide Global warming

Kinematic Analysis and Experimental Verification on the Locomotion of Gecko

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Journal of Bionic Engineering 2009年第3期6卷 246-254页

作者： Woochul Nam Taewon seo Byungwook Kim DongsuJeon Kyu-Jin cho Jongwon Kim School of Mechanical and Aerospace Engineering Seoul National University Mechanical Engineering Carnegie Mellon University

This paper presents a kinematic analysis of the locomotion of a gecko,and experimental verification of the kinematic *** analysis is important for parameter design,dynamic analysis,and optimization in biomimetic robot research. The proposed kinematic analysis can simulate,without iteration,the locomotion of gecko satisfying the constraint conditions that maintain the position of the contacted feet on the *** the method has an advantage for analyzing the climbing motion of the quadruped mechanism in a real time *** kinematic model of a gecko consists of four legs based on 7-degrees of freedom spherical-revolute-spherical joints and two revolute joints in the *** motion of the kinematic model is simulated based on measurement data of each *** motion of the kinematic model simulates the investigated real gecko's motion by using the experimental *** analysis solves the forward kinematics by considering the model as a combination of closed and open serial mechanisms under the condition that maintains the contact positions of the attached feet on the ground. The motions of each joint are validated by comparing with the experimental *** addition to the measured gait,three other gaits are simulated based on the kinematic *** maximum strides of each gait are calculated by workspace *** result can be used in biomimetic robot design and motion planning.

关键词： kinematic analysis locomotlon of gecko lizard gait simulation various gaits workspace analysis