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Numerical simulation of ice-ring formation in the jointed rock mass around underground LNG storage cavern using thermo-hydraulic model

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Numerical simulation of ice-ring formation in the jointed ro...

Change of joint aperture during formation of ice-ring around underground LNG storage cavern

Harmonising Rock Engineering and the Environment—12th ISRM International Congress on Rock Mechanics

作者： So-Keul Chung eui-seob park Joong-Ho Synn Woo-Cheol Jeong Taek-Kon Kim Korea Institute of Geoscience and Mineral Resources DaejeonKorea

＜正＞Experience on the underground storage for the crude oil and various types of hydrocarbons proved to be an economical means for the storage of *** the knowledge from our past experience,attempts were made to develop the LNG underground storage system but were not successful due to its failure in controlling the temperature and groundwater without *** the past trials,it was observed that the thermal stress and freezing of groundwater nearby to the cavern generated cracks in the host rock ***,these thermal cracks contributed to induce gas leakage leading to the increase in heat flux exchange between the stored LNG

关键词： fluid flow ground freezing rock joints cryo-suction

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Change of joint aperture during formation of ice-ring around...

Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

Harmonising Rock Engineering and the Environment—12th ISRM International Congress on Rock Mechanics

作者： eui-seob park So-Keul Chung Joong-Ho Synn Woo-Cheol Jeong Taek-Kon Kim Seong-Ho Bae Geologic Environment Division Korea Institute of Geoscience and Mineral ResourcesDaejeonKorea

＜正＞In general,either above-ground tanks or in-ground tanks been used worldwide to store *** types of tanks have a number of problems such as the need for a large site for storage tanks,ground settlement,high operating costs,an excessive boil-off ratio due to radiant heat from the sun,and so *** attempts have therefore been made in the past to store LNG underground in unlined containment,though without success. The new system for storing LNG in rock caverns had been developed and verified through the design,construction and operation of a LNG pilot plant in Daejeon,***

关键词： fluid flow ground freezing rock joints cryosuction

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Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun Lee Yong Nam Ahn Seongjoon So Chanwoo park Jong-Seong Bae Taehyun park Il Tae Kim Jaehyun Hur School of Chemical Biological and Battery Engineering Gachon University Seongnam Busan Center Korea Basic Science Institute

Aqueous Zn-ion batteries （AZIBs） have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction （HER） from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO3（CTO） protective layer on Zn（CTO@Zn） as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant （εr=180） and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn2+ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and HER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential （～68 m V） for 1500 h at 1 mA cm-2/0.5 mA h cm-2,excelling bare ***,when paired with the V2O5-C cathode,the CTO@Zn//V2O5-C full battery delivers 148.4 mA h g-1（based on the mass of the cathode） after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： Artificial layer Dielectric constant Zn metal anode Zinc aqueous battery

Ransomware Classification Framework Using the Behavioral Performance Visualization of Execution Objects

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Computers, Materials & Continua 2022年第8期72卷 3401-3424页

作者： Jun-seob Kim Ki-Woong park Department of Computer and Information Security and Convergence Engineering for Intelligent DroneSejong UniversitySeoul05006Korea

A ransomware attack that interrupted the operation of Colonial Pipeline(a large *** pipeline company),showed that security threats by malware have become serious enough to affect industries and social infrastructure rather than individuals *** agents and characteristics of attacks should be identified,and appropriate strategies should be established accordingly in order to respond to such *** this purpose,the first task that must be performed is malware *** creators are well aware of this and apply various concealment and avoidance techniques,making it difficult to classify *** study focuses on new features and classification techniques to overcome these *** propose a behavioral performance visualization method using utilization patterns of system resources,such as the central processing unit,memory,and input/output,that are commonly used in performance analysis or tuning of *** extracted the usage patterns of the system resources for ransomware to performbehavioral performance *** results of the classification performance evaluation using the visualization results indicate an accuracy of at least 98.94%with a 3.69%loss ***,we designed and implemented a framework to perform the entire process—from data extraction to behavioral performance visualization and classification performance measurement—that is expected to contribute to related studies in the future.

关键词： Behavioral performance visualization ransomware malware classification

Phenyl-triggered photophysical switching between normal fluorescence and delayed fluorescence in phthalonitrile-based luminophores

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Aggregate 2021年第1期2卷 145-150页

作者： In seob park Hyukgi Min Takuma Yasuda INAMORI Frontier Research Center(IFRC) Kyushu UniversityFukuokaJapan Department of Applied Chemistry Graduate School of EngineeringKyushu UniversityFukuokaJapan

Herein,a facile strategy for switching luminescent properties between normal fluorescence and thermally activated delayed fluorescence(TADF)is *** luminophoric molecules,VPN-Ph and VPN-H,combining phthalonitrile as an electron-accepting core and triphenylamines as electron-donating peripheries with and without two phenyl groups,are newly developed.A comparative study on their structural and photophysical properties is *** non-phenyl VPN-H does not exhibit TADF but normal fluorescence,phenyl-introduced VPNPh exhibits TADF with a high photoluminescence quantum yield as a consequence of the phenyl-triggered steric *** virtue of the TADF feature,an organic light-emitting diode(OLED)incorporating VPN-Ph as an emitter achieves a maximum external electroluminescence(EL)quantum efficiency as high as 28.0%,which is five times higher than that of the VPN-H-based ***,phenyl-triggered geometric modulation has a drastic impact on the resulting photophysical and EL properties,leading to TADF on/off switching.

关键词： intramolecular charge transfer molecular orientation organic light-emitting diodes photophysical switching phthalonitrile thermally activated delayed fluorescence

Effects of humic acid on phytodegradation of petroleum hydrocarbons in soil simultaneously contaminated with heavy metals

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Journal of Environmental Sciences 2011年第12期23卷 2034-2041页

作者： Soyoung park Ki seob Kim Jeong-Tae Kim Daeseok Kang Kijune Sung Department of Ocean Engineering Pukyong National University Busan 608-737 Korea Department of Ecological Engineering Pukyong National University Busan 608-737 Korea

The use of humic acid （HA） to enhance the efficiency of phytodegradation of petroleum hydrocarbons in soil contaminated with diesel fuel was evaluated in this study. A sample of soil was artificially contaminated with commercially available diesel fuel to an initial total petroleum hydrocarbons （TPH） concentration of 2300 mg/kg and four heavy metals with concentrations of 400 mg/kg for Pb, 200 mg/kg for Cu, 12 mg/kg for Cd, and 160 mg/kg for Ni. Three plant species, Brassica campestris, Festuca arundinacea, and Helianthus annuus, were selected for the phytodegradation experiment. Percentage degradation of TPH in the soil in a control pot supplemented with HA increased to 45% from 30% without HA. The addition of HA resulted in an increases in the removal of TPH from the soil in pots planted with B. campestris, F. arundinacea, and H. annuus, enhancing percentage degradation to 86%, 64%, and 85% from 45%, 54%, and 66%, respectively. The effect of HA was also observed in the degradation of n-alkanes within 30 days. The rates of removal of n-alkanes in soil planted with B. campestris and H. annuus were high for n-alkanes in the range of C11–C28. A dynamic increase in dehydrogenase activity was observed during the last 15 days of a 30-day experimental period in all the pots amended with HA. The enhanced biodegradation performance for TPHs observed might be due to an increase in microbial activities and bioavailable TPH in soils caused by combined effects of plants and HA. The results suggested that HA could act as an enhancing agent for phytodegradation of petroleum hydrocarbons in soil contaminated with diesel fuel and heavy metals.

关键词： phytodegradation TPHs humic acid n-alkanes DHA combined effects

Bioinspired magnetic cilia:from materials to applications

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Microsystems & Nanoengineering 2023年第6期9卷 107-128页

作者： Seongjin park Geonjun Choi Minsu Kang Woochan Kim Jangho Kim Hoon eui Jeong Department of Mechanical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Department of Convergence Biosystems Engineering Chonnam National UniversityGwangju61186Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju61186Republic of Korea

Microscale and nanoscale cilia are ubiquitous in natural systems where they serve diverse biological *** artificial magnetic cilia have emerged as a highly promising technology with vast potential applications,ranging from soft robotics to highly precise *** this review,we comprehensively discuss the roles of cilia in nature and the various types of magnetic particles utilized in magnetic cilia;additionally,we explore the top-down and bottom-up fabrication techniques employed for their ***,we examine the various applications of magnetic cilia,including their use in soft robotics,droplet and particle control systems,fluidics,optical devices,and ***,we present our conclusions and the future outlook for magnetic cilia research and development,including the challenges that need to be overcome and the potential for further integration with emerging technologies.

关键词： magnetic overcome precise

A fast and simple system performance emulator for enhanced solid state disks:a case study of long read operations

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第6期11卷 418-424页

作者： Do Yeun KIM Chanik park eui-Young CHUNG Sung Woo CHUNG Division of Computer and Communication Engineering Korea University Seoul 13-713 Korea Samsung Electronics Yongin-City Kyunggi-Do 446-701 Korea School of Electrical and Electronic Engineering Yonsei University Seoul 120-749 Korea

In this paper, we propose a fast and simple system emulator, called a system performance emulator(SPE), to evaluate long read *** SPE estimates how much system-wide performance is enhanced by using a faster solid state disk(SSD).By suspending a CPU for a certain time during direct memory access(DMA) transfer and subtracting this suspended time from the total DMA time, the SPE estimates the improvement in system performance expected from an enhanced SSD prior to its *** also examine the relation between storage performance and system performance using the SPE.

关键词： Solid state disk(SSD) Performance emulator System performance Direct memory access(DMA) Operating system

Scalable Ir-Doped NiFe₂O₄/TiO₂ Heterojunction Anode for Decentralized Saline Wastewater Treatment and H₂ Production

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NANO-MICRO LETTERS 2025年第1期17卷 1-18页

作者： Hong, Sukhwa Kim, Jiseon park, Jaebeom Im, Sunmi Hoffmann, Michael R. Cho, Kangwoo Pohang Univ Sci & Technol POSTECH Div Environm Sci & Engn Pohang 790784 South Korea CALTECH Linde Labs Pasadena CA 91125 USA Yonsei Univ Int Campus Inst Convergence Res & Educ Adv Technol I CREATE Incheon 21983 South Korea

Wastewater electrolysis cells (WECs) for decentralized wastewater treatment/reuse coupled with H-2 production can reduce the carbon footprint associated with transportation of water, waste, and energy carrier. This study reports Ir-doped NiFe2O4 (NFI, similar to 5 at% Ir) spinel layer with TiO2 overlayer (NFI/TiO2), as a scalable heterojunction anode for direct electrolysis of wastewater with circumneutral pH in a single-compartment cell. In dilute (0.1 M) NaCl solutions, the NFI/TiO2 marks superior activity and selectivity for chlorine evolution reaction, outperforming the benchmark IrO2. Robust operation in near-neutral pH was confirmed. Electroanalyses including operando X-ray absorption spectroscopy unveiled crucial roles of TiO2 which serves both as the primary site for Cl- chemisorption and a protective layer for NFI as an ohmic contact. Galvanostatic electrolysis of NH4+-laden synthetic wastewater demonstrated that NFI/TiO2 not only achieves quasi-stoichiometric NH4+-to-N-2 conversion, but also enhances H-2 generation efficiency with minimal competing reactions such as reduction of dissolved oxygen and reactive chlorine. The scaled-up WEC with NFI/TiO2 was demonstrated for electrolysis of toilet wastewater.

关键词： Wastewater electrolysis cell Ir-doped NiFe2O4 Reactive chlorine species Decentralized H-2 production On-site wastewater treatment