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Study on the removal of NO_x from simulated flue gas using acidic NaClO_2 solution

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Journal of Environmental Sciences 2008年第1期20卷 33-38页

作者： Bal Rai Deshwal Si Hyun Lee jong hyeon jung Byung Hyun Shon Hyung Keun Lee Department of Chemistry A.I.J.H.M College Rohtak 124001 (Haryana) India. Korea Institute of Energy Research Daejeon-305 343 Korea Department of Environmental Engineering Sorabol College Kyungbuk 780711 Korea Department of Environmental Engineering Hanseo University Chungnam 356820 Korea

The study on the removal of NOx from simulated flue gas has been carded out in a lab-scale bubbling reactor using acidic solutions of sodium chlorite. Experiments were performed at various pH values and inlet NO concentrations in the absence or presence of SO2 gas at 45℃. The effect of SO2 on NO oxidation and NO2 absorption was critically examined. The oxidative ability of sodium chlorite was investigated at different pH values and it was found to be a better oxidant at a pH less than 4. In acidic medium, sodium chlorite decomposed into C102 gas, which is believed to participate in NO oxidation as well as in NO2 absorption. A plausible NOx removal mechanism using acidic sodium chlorite solution has been postulated. A maximum NOx removal efficiency of about 81% has been achieved.

关键词： bubbling reactor acidic sodium chlorite flue gas NOx removal

Vaporization reduction characteristics of aqueous ammonia solutions by the addition of ethylene glycol, glycerol and glycine to the CO_2 absorption process

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Journal of Environmental Sciences 2012年第3期24卷 494-498页

作者： jong-Beom Seo Soo-Bin Jeon Je-Young Kim Gang-Woo Lee jong-hyeon jung Kwang-Joong Oh Department of Environmental Engineering Pusan National University Busan 609735 Korea. Research Institute of Industrial Science & Technology Pohang 790330 Korea Research & Development Institute of Yoosung Co. Ltd. Ulsan 680070 Korea Faculty of Health Science Daegu Haany University Daegu 712715 Korea

Aqueous ammonia （NH3） solution can be used as an alternative absorption for the control of CO2 emitted from flue gases due to its high absorption capacity, fast absorption rate and low corrosion problem. The emission of CO2 from iron and steel plants requires much attention, as they are higher than those emitted from power plants at a single point source. In the present work, low concentration ammonia liquor, 9 wt.%, was used with various additives to obtain the kinetic properties using the blast furnace gas model. Although a solution with a high ammonia concentration enables high CO2 absorption efficiency, ammonium ions are lost as ammonia vapor, resulting in reduced CO2 absorption due to the lower concentration of the ammonia absorbent. To decrease the vaporization of ammonia, ethylene glycol, glycerol and glycine, which contain more than one hydroxyl radical, were chosen. The experiments were conducted at 313 K similar to the CO2 absorption conditions for the blast furnace gas model.

关键词： ammonia vaporization blast furnace gas ethylene glycol glycerol glycine

Do you have what it takes for challenging endoscopic submucosal dissection cases?

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World Journal of Gastroenterology 2011年第31期17卷 3580-3584页

作者： Kyoung-Oh Kim Sung jung Kim Tae hyeon Kim jong-Jae Park Division of Gastroenterology and Hepatology Department of Internal MedicineHallym University Medical Center Division of Gastroenterology and Hepatology Department of Internal MedicineWonkwang University Hospital Division of Gastroenterology and Hepatology Department of Internal MedicineKorea University Guro Hospital Korea University College of Medicine

Endoscopic submucosal dissection(ESD) is a widely accepted treatment for early gastric cancer(EGC),especially in Korea and *** criteria for the therapeutic use of ESD for EGC have been expanded ***,attention should be drawn to the technical feasibility of the ESD treatment which depends on a lesion's location,size or fibrosis level,or operator's *** the case of a lesion with a high level of difficulty,a more experienced operator is ***,the treatment for a lesion with a high level of difficulty should be performed according to the degree of the operator's *** this paper,the authors describe the ESD procedure for lesions with a high level of difficulty.

关键词： Endoscopic submucosal dissection Anatomical location Technical feasibility

Naturalization of Landscaping Woody Plant, Magnolia obovata Potentially Invasive Species

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Journal of Mountain Science 2015年第1期12卷 30-38页

作者： KWON Oh jung OH Choong hyeon Graduate School Department of Biological and Environmental Science Dongguk University Department of Biological and Environmental Science Dongguk University

Magnolia obovata, a tree species native to Japan, is a traditional landscaping tree that has also been introduced to various countries. M. obovata individuals have recently emerged in non-planting areas in Korea, prompting us to investigate its distribution by establishing Dosolsan in an urban forest of Daejeon City as the target site. In order to determine its naturalization, the study explored the status of population growth by examining the diameter at breast height of the individuals, and diameter diminution quotient was calculated. Cores of the trees were collected, and the age distribution was estimated by regression analysis. Reproduction possibility was analyzed by verifying the flowerblooming and fruit-bearing. Spontaneous colonization was investigated in the other potential sites which have different location and environment, *** diameter distribution showed a reverse J-shaped curve, and the diminution quotient was ≥ 1.8. The population was composed of different generations,thus confirming the growth of the population. The distributed M. obovata grew and flowered normally,and followed a normal life cycle. The same phenomenon was observed in other planting areas,residual forests in urban or rural areas, alluvial islands, and mountain forests. The continuous spread of M. obovata in new ecosystems may be attributable to its long-term distribution by birds, relatively fast growth, and maturity time. Investigations on the naturalization and spread of M. obovata in Korea, as well as in various countries, are warranted.

关键词： Magnolia obovata Diameterdistribution Diminution quotient Invasive plant Naturalized plant

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

Solar Power Plant Network Packet-Based Anomaly Detection System for Cybersecurity

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Computers, Materials & Continua 2023年第10期77卷 757-779页

作者： Ju hyeon Lee Jiho Shin jung Taek Seo Department of Information Security Gachon UniversitySeongnam13120Korea Police Science Institute Korean National Police UniversityAsan31539Korea Department of Computer Engineering Gachon UniversitySeongnam13120Korea

As energy-related problems continue to emerge,the need for stable energy supplies and issues regarding both environmental and safety require urgent *** energy is becoming increasingly important,with solar power accounting for the most significant proportion of *** the scale and importance of solar energy have increased,cyber threats against solar power plants have also ***,we need an anomaly detection system that effectively detects cyber threats to solar power ***,as mentioned earlier,the existing solar power plant anomaly detection system monitors only operating information such as power generation,making it difficult to detect *** address this issue,in this paper,we propose a network packet-based anomaly detection system for the Programmable Logic Controller(PLC)of the inverter,an essential system of photovoltaic plants,to detect cyber *** and vulnerabilities in solar power plants were analyzed to identify cyber threats in solar power *** analysis shows that Denial of Service(DoS)and Manin-the-Middle(MitM)attacks are primarily carried out on inverters,aiming to disrupt solar plant *** develop an anomaly detection system,we performed preprocessing,such as correlation analysis and normalization for PLC network packets data and trained various machine learning-based classification models on such *** Random Forest model showed the best performance with an accuracy of 97.36%.The proposed system can detect anomalies based on network packets,identify potential cyber threats that cannot be identified by the anomaly detection system currently in use in solar power plants,and enhance the security of solar plants.

关键词： Renewable energy solar power plant cyber threat cybersecurity anomaly detection machine learning network packet

Preparation and characterization of Li_(4)Ti_(5)O_(12) synthesized using hydrogen titanate nanowire for hybrid super capacitor

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Journal of Advanced Ceramics 2013年第3期2卷 285-290页

作者： jong Hyun KIM jung Rag YOON R&D Center Samwha Capacitor Co.Ltd.YonginGyeonggi 449-884R.O.Korea

The electrical characteristics of hybrid super capacitor were evaluated by synthesizing LTO(Li_(4)Ti_(5)O_(12))using TiO_(2) having a hydrogen titanate nanowire *** of the hydrogen titanate nanowire was implemented by using TiO_(2) having size of 60 nm and NaOH,and performing synthesis at 70℃for 6 h with a sonochemical *** compound was synthesized at 150℃for 36 h and at 180℃for 36 h respectively by using the hydrogen titanate nanowire and LiOH·H2O as starting materials with a hydrothermal *** final LTO compound was synthesized at 700℃for 6 h using a solid-state *** a result of manufacturing the hybrid super capacitor using LTO synthesized at 180℃for 36 h with the hydrothermal method,a capacity of 198 mA·h/g has been achieved compared to a theoretical capacity of 172 mA·h/g of existing LTO,and thus,the capacity has been increased by about 13%.Further,such excellent cycle performance has ensured its possibility as a high-capacity capacitor.

关键词： LTO(Li4Ti5O12) lithium titanate oxide hydrogen titanate nanowire hybrid super capacitor

High-accuracy thermodynamic properties to the melting point from ab initio calculations aided by machine-learning potentials

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npj Computational Materials 2023年第1期9卷 2310-2321页

作者： jong Hyun jung Prashanth Srinivasan Axel Forslund Blazej Grabowski Institute for Materials Science University of StuttgartPfaffenwaldring 5570569 StuttgartGermany

Accurate prediction of thermodynamic properties requires an extremely accurate representation of the free-energy *** are twofold—first,the inclusion of the relevant finite-temperature mechanisms,and second,a dense volume–temperature grid on which the calculations are performed.A systematic workflow for such calculations requires computational efficiency and reliability,and has not been available within an ab initio framework so ***,we elucidate such a framework involving direct upsampling,thermodynamic integration and machine-learning potentials,allowing us to incorporate,in particular,the full effect of anharmonic *** improved methodology has a five-times speed-up compared to state-of-the-art *** calculate equilibrium thermodynamic properties up to the melting point for bcc Nb,magnetic fcc Ni,fcc Al,and hcp Mg,and find remarkable agreement with experimental data.A strong impact of anharmonicity is observed specifically for *** introduced procedure paves the way for the development of ab initio thermodynamic databases.

关键词： harmonic point prediction

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