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49th International Congress and Exposition on Noise Control engineering, INTER-NOISE 2020

作者： Choi, Kang-Hoon Choi, Jee Woong Kim, Sunhyo Dahl, Peter H. Department of Marine Science and Convergence Engineering Hanyang University 55 Hanyangdaehak-ro Sangnok-gu Ansan Gyeonggi-do Korea Republic of Maritime Security Research Center Korea Institute of Ocean Science and Technology 385 Haeyang-ro Yeongdo-gu Busan Korea Republic of Applied Physics Laboratory University of Washington Seattle 1013 NE 40th St. SeattleWA United States

ISBN: (纸本)9788994021362

Time reversal communication is a robust method to utilize spatial diversity gain and thus reduce delay spreads causing inter-symbol interference (ISI) by focusing the sound at a single position using the channel impulse response. However, it needs a large-size array consisting of spatially separated receivers. Acoustic vector sensor is more advantageous in spatial efficiency than pressure sensor because it can simultaneously measure three orthogonal vector quantities as well as acoustic pressure at a single point in space. In this paper, the time reversal communication results obtained by acoustic vector sensor are presented. Communication data collected during Korea Reverberation Experiment (KOREX-17) conducted in shallow water off the south coast of Korea on May 2017 using a single vector sensor. The communication results showed that the block-based time reversal technique with all the vector quantities and acoustic pressure gave better performances than the passive time reversal with those in time-varying channel, and the communication system including the only horizontal components performed better than the systems including all the horizontal and vertical components in this environment. © Proceedings of 2020 International Congress on Noise Control engineering, INTER-NOISE 2020. All rights reserved.

关键词： Impulse response

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High-frequency acoustic backscattering characteristics for acoustic detection of the red tide species Akashiwo sanguinea and Alexandrium affine

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Journal of Oceanology and Limnology 2019年第4期37卷 1268-1276页

作者： KIM Hansoo KANG Donhyug JUNG Seung Won KIM Mira Maritime Security and Safety Research Center Korea Institute of Ocean Science & Technology (KIOST) Busan 49111 Korea Department of Ocean System Engineering Jeju National University Jeju 63243 Korea Library of Marine Samples Korea Institute of Ocean Science & Technology (KIOST) Geoje 53201 Korea

Harmful algal blooms (HABs), caused by the overgrowth of certain phytoplankton species, have negative effects on marine environments and coastal fisheries. In addition to cell-counting methods using phytoplankton nets, a hydroacoustic technique based on acoustic backscattering has been proposed for the detection of phytoplankton blooms. However, little is known of the acoustic properties of HAB species. In this study, as essential data to support this technique, we measured the acoustic properties of two HAB species, Akashiwo sanguinea and Alexandrium affine, which occur in the South Sea off the coast of Korea. Due to the small size of the target, we used ultrasound for the measurements. Experiments were conducted under laboratory and field conditions. In the laboratory experiment, the acoustic signal received from each species was directly proportional to the cell abundance. We derived a relationship between the cell abundance and acoustic signal received for each species. The measured signals were compared to predictions of a fluid sphere scattering model. When A. sanguinea blooms appeared at an abundance greater than 3 500 cells/mL, the acoustic signals varied with cell abundance, showing a good correlation. These results confirm that acoustic measurements can be used to detect HAB species.

关键词： acoustic backscattering Akashiwo sanguinea Alexandrium affine fluid-sphere scattering model harmful algal blooms (HABs) red tide

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Evaluating the Adhesive Properties of Electroless Cu on Glass-reinforced Epoxy-based Build-up Dielectric Films via Nanoindentation

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IEEE Transactions on Components, Packaging and Manufacturing technology 2025年

作者： Kang, Yeojin Park, Wonjung Yoo, Dayoung Won, Kyung-Ah Lee, Seung-Gun Kim, Jong-Man Kim, Yangdo Lee, Dongyun Pusan National University Department of Nano Fusion Technology Busan46241 Korea Republic of Korea Institute of Science and Technology Institute of Advanced Composite Materials Jeollabuk-do 55324 Korea Republic of LG Innotek E1/E3 30 Magokjungang 10-ro Gangseo-gu Seoul07796 Korea Republic of Korea Institute of Materials Science Department of Hydrogen Materials Evaluation Gyeongsangnam-do 51508 Korea Republic of Pusan National University Department of Nanoenergy Engineering Research Center of Energy Convergence Technology Busan46241 Korea Republic of Pusan National University School of Materials Science and Engineering Busan46241 Korea Republic of

This study investigates the adhesion properties of electroless copper (Cu) plated on glass-reinforced epoxy-based build-up films (Ajinomoto Build-up Film, ABF) using nanoindentation techniques. The adhesion strength was quantified through critical load measurements in scratch tests, revealing critical loads of approximately 19.7 mN for chemical-U and 13.3 mN for chemical-A, corresponding to adhesion strengths of 0.46 kgf/cm and 0.16 kgf/cm, respectively. Microscopic analysis confirmed uniform copper distribution at the interface within the first minute of deposition, with notable differences in mechanical properties between the two plating chemicals. The study highlights the importance of epoxy exposure control via the desmear process, which significantly enhances ABF/Cu adhesion by expanding the contact area. Additionally, the role of the pegging effect and chemical bonding (C-O bond formation) in improving adhesion is emphasized. These findings provide valuable insights into optimizing the interfacial adhesion of ABF/Cu systems for advanced microelectronic applications. © 2011-2012 IEEE.

关键词： Bond strength (chemical)

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Federated learning for big data: A survey on opportunities, applications, and future directions

arXiv

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arXiv 2021年

作者： Gadekallu, Thippa Reddy Pham, Quoc-Viet Huynh-The, Thien Bhattacharya, Sweta Maddikunta, Praveen Kumar Reddy Liyanage, Madhusanka School of Information Technology and Engineering Vellore Institute of Technology India Korean Southeast Center for the 4th Industrial Revolution Leader Education Pusan National University Busan46241 Korea Republic of ICT Convergence Research Center Kumoh National Institute of Technology Korea Republic of School of Computer Science University Collage Dublin Ireland and Centre for Wireless Communications University of Oulu Finland

Big data has remarkably evolved over the last few years to realize an enormous volume of data generated from newly emerging services and applications and a massive number of Internet-of-Things (IoT) devices. The potential of big data can be realized via analytic and learning techniques, in which the data from various sources is transferred to a central cloud for central storage, processing, and training. However, this conventional approach faces critical issues in terms of data privacy as the data may include sensitive data such as personal information, governments, banking accounts. To overcome this challenge, federated learning (FL) appeared to be a promising learning technique. However, a gap exists in the literature that a comprehensive survey on FL for big data services and applications is yet to be conducted. In this article, we present a survey on the use of FL for big data services and applications, aiming to provide general readers with an overview of FL, big data, and the motivations behind the use of FL for big data. In particular, we extensively review the use of FL for key big data services, including big data acquisition, big data storage, big data analytics, and big data privacy preservation. Subsequently, we review the potential of FL for big data applications, such as smart city, smart healthcare, smart transportation, smart grid, and social media. Further, we summarize a number of important projects on FL-big data and discuss key challenges of this interesting topic along with several promising solutions and directions. © 2021, CC BY-NC-ND.

关键词： Big data

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Correction to: Al-12Si Alloy Fabricated Via Selective Laser Melting: Residual Stress and Microstructural Factors after Heat Treatment

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Journal of Materials engineering and Performance 2023年第5期33卷 2166-2166页

作者： Park, Seonghwan Kim, Sang Hoon Park, Jiyong Lee, Eunkyung Advanced Joining and Additive Manufacturing R&D Department Korea Institute of Industrial Technology Incheon Republic of Korea Department of Convergence Manufacturing System Engineering University of Science and Technology (UST) Daejeon Republic of Korea Additive Manufacturing Innovation Agency Korea Institute of Industrial Technology Siheung Republic of Korea Interdisciplinary Major of Maritime AI Convergence Department of Ocean Advanced Materials Convergence Engineering Korea Maritime and Ocean University Busan South Korea

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Comparison of 2 Different Paclitaxel-Coated Balloons in Coronary In-Stent Restenosis: A Randomized Controlled Trial

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JACC: Asia 2022年第2期2卷 170-179页

作者： Jun, Eun Jung Shin, Eun-Seok Yuan, Song Lin Bhak, Youngjune Garg, Scot Kang, Woong Chol Kim, Je Sang Kim, June-Hong Bae, Jang-Whan Rha, Seung-Woon Chae, In-Ho Division of Cardiology Department of Internal Medicine Ulsan University Hospital University of Ulsan College of Medicine Ulsan South Korea Division of Cardiology Department of Internal Medicine Ulsan Medical Center Ulsan South Korea Department of Cardiology Dong-A University Hospital Busan South Korea Department of Biomedical Engineering College of Information-Bio Convergence Engineering Ulsan National Institute of Science and Technology Ulsan South Korea Department of Cardiology East Lancashire Hospitals NHS Trust Blackburn United Kingdom Cardiology Division Department of Internal Medicine Gil Medical Center Gachon University College of Medicine Incheon South Korea Department of Cardiology Dongguk University Ilsan Hospital Goyang South Korea Cardiovascular Center Pusan National University Yangsan Hospital Yangsan South Korea Division of Cardiology Department of Internal Medicine College of Medicine Chungbuk National University Cheongju South Korea Cardiovascular Center Korea University Guro Hospital Seoul South Korea Division of Cardiology Department of Internal Medicine Seoul National University Bundang Hospital Seongnam South Korea

Background: Drug-coated balloons (DCBs) offer an effective treatment for in-stent restenosis (ISR). The Genoss DCB is a novel paclitaxel-coated balloon with a shellac plus vitamin E excipient that enhances drug delivery to the target lesion, minimizing restenosis. Objectives: This study aimed to investigate the angiographic efficacy, clinical safety, and effectiveness of the novel shellac plus vitamin E–based DCB in a randomized controlled trial designed to enable regulatory approval of this new device in South Korea. Methods: This noninferiority trial randomized patients experiencing their first ISR to the novel shellac plus vitamin E–based DCB or the reference SeQuent Please iopromide-based DCB in a 1:1 ratio. All patients underwent planned angiographic and clinical follow-up at 6 months. The study was powered for the primary endpoint of 6 months in-segment late lumen loss (LLL). Results: A total of 82 patients from 7 centers were randomized to either the novel shellac plus vitamin E–based DCB group (n = 41) or the reference iopromide-based DCB group (n = 41). The 6-month in-segment LLL was 0.15 ± 0.43 mm with the novel DCB compared with 0.24 ± 0.39 mm with the reference device. The 1-sided 97.5% upper confidence limit of the difference was 0.13 mm, lower than the noninferiority limit of 0.29 mm, achieving noninferiority (P for noninferiority = 0.001). Major cardiovascular events were comparable between 2 groups at 6 months (7.7% for the novel DCB vs 10.3% for the reference DCB;P = 0.692). Conclusions: In this multicenter, head-to-head comparison randomized trial, the novel shellac plus vitamin E–based DCB showed a comparable result to the reference iopromide-based device for the primary endpoint of 6-month in-segment LLL for the treatment of coronary ISR. (Compare the Safety and Efficacy of Genoss® DCB and SeQuent® Please in Korean Patient With Coronary In-stent Restenosis;NCT04405063) © 2022 The Authors

关键词： cardiovascular events drug-coated balloon in-segment late lumen loss major adverse

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Corrigendum to `High-energy density ultra-thick drying-free Ni-rich cathode electrodes for application in lithium-ion batteries’ [Energy Storage Materials 71 (2024) Start page(1)–End page(13)/103542]

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Energy Storage Materials 2024年 71卷

作者： Tom James Embleton Jae Hong Choi Sung-Jae Won Jahanzaib Ali Kashif Saleem Saqib Kyungmok Ko Mina Jo Junhyeok Hwang Joohyuk Park Jin Hong Lee Jinsoo Kim Min Kyung Kim Ji-Won Jung Minjoon Park Pilgun Oh Department of Smart Green Technology Engineering and Department of Nanotechnology Engineering Pukyong National University Busan 48547 Republic of Korea Department of Advanced Materials Engineering Keimyung University 1095 Dalgubeol-daero Dalseo-gu Daegu 42601 Republic of Korea School of Chemical Engineering Pusan National University Busan 46421 Republic of Korea Ulsan Advanced Energy Technology R&D Center Korea Institute of Energy Research (KIER) Ulsan 44776 Republic of Korea School of Materials Science and Engineering University of Ulsan (UOU) Ulsan 44776 Republic of Korea Division of Chemical Engineering Konkuk University Seoul 05029 Republic of Korea Department of Nanoenergy Engineering Department of Nano Fusion Technology Research Center of Energy Convergence Technology Pusan National University 50 Busan daehak-ro 63 beon-gil 2 Geumjeong-gu Busan 46241 Republic of Korea

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Effect of thermal and alkaline pretreatments on polyhydroxybutyrate solubilization and subsequent anaerobic digestion: Solubilization efficiency, methane production and microbial community

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Energy Conversion and Management: X 2024年

作者： Minjae Kim Trang Thi Nhu Le Minsu Song Sungyun Jung Mi Na Rhie Thien Truc Thanh Ngo Seonmin Kang Chaeyoung Rhee Seung Gu Shin Joonyeob Lee Division of Earth Environmental System Science (Major of Environmental Engineering) Pukyong National University Busan 48513 Republic of Korea Institute of Sustainable Earth and Environmental Dynamics (SEED) Pukyong National University Busan 48547 Republic of Korea National Fishery Products Quality Management Service Busan 49111 Republic of Korea Department of Energy Engineering Future Convergence Technology Research Institute Gyeongsang National University Jinju Gyeongnam 52828 Republic of Korea

The effects of temperature T (37–91 °C), pH (7–13) and reaction time t (24–120 h) of thermal-alkaline pretreatment on polyhydroxybutyrate (PHB) solubilization and anaerobic methane production were investigated using a 3 2  × 4 mixed-level full factorial experiment. Nearly complete solubilization (99.6 %) of PHB was achieved under thermal-alkaline pretreatment conditions of 91 °C, pH 13, and 120 h. The anaerobic digestion (AD) of pretreated PHB resulted in a substantial improvement in methane production, with a 15.6-times increase in methane production rate (56.3 mL-CH 4 /g-VSS/d), a 86 % reduction in the time required for complete AD of PHB, yielding 362.8 mL-CH 4 /g-COD PHB , compared to AD of unpretreated PHB. All three pretreatment factors significantly affected PHB solubilization and anaerobic methane production, and a synergistic effect was observed between pH and temperature. The quantitative relationships between T , pH, and t of the thermal-alkaline pretreatment on solubilization efficiency and methane production were successfully expressed using partial cubic models. Positive correlations were found between these responses. Distinct microbial communities were enriched during AD of unpretreated and pretreated PHBs. Spirochaetaceae, Christensenellaceae R-7 group , Mesotoga , Syntrophomonas , Sedimentibacter , candidatus Methanofastidiosum , and Methanosaeta were identified as active microbial communities involved in the AD of PHB. These results demonstrate that optimized thermal-alkaline pretreatment can effectively improve the AD of PHB, highlighting the potential of PHB waste as a promising feedstock for AD

关键词： Biogas production Anaerobic digestion Polyhydroxybutyrate Thermal-alkaline pretreatment Microbial communities

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Transfer learning for future wireless networks: A comprehensive survey

arXiv

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arXiv 2021年

作者： Nguyen, Cong T. Van Huynh, Nguyen Chu, Nam H. Saputra, Yuris Mulya Hoang, Dinh Thai Nguyen, Diep N. Pham, Quoc-Viet Niyato, Dusit Dutkiewicz, Eryk Hwang, Won-Joo School of Electrical and Data Engineering University of Technology Sydney SydneyNSW2007 Australia Research Institute of Computer Information and Communication Pusan National University Busan46241 Korea Republic of School of Computer Science and Engineering Nanyang Technological University Singapore639798 Singapore Department of Biomedical Convergence Engineering Pusan National University Yangsan50612 Korea Republic of

With outstanding features, Machine Learning (ML) has become the backbone of numerous applications in wireless networks. However, the conventional ML approaches face many challenges in practical implementation, such as the lack of labeled data, the constantly changing wireless environments, the long training process, and the limited capacity of wireless devices. These challenges, if not addressed, can impede the effectiveness and applicability of ML in wireless networks. To address these problems, Transfer Learning (TL) has recently emerged to be a promising solution. The core idea of TL is to leverage and synthesize distilled knowledge from similar tasks as well as from valuable experiences accumulated from the past to facilitate the learning of new problems. Doing so, TL techniques can reduce the dependence on labeled data, improve the learning speed, and enhance the ML methods' robustness to different wireless environments. This article aims to provide a comprehensive survey on applications of TL in wireless networks. Particularly, we first provide an overview of TL including formal definitions, classification, and various types of TL techniques. We then discuss diverse TL approaches proposed to address emerging issues in wireless networks. The issues include spectrum management, localization, signal recognition, security, human activity recognition and caching, which are all important to next-generation networks such as 5G and beyond. Finally, we highlight important challenges, open issues, and future research directions of TL in future wireless networks. © 2021, CC BY-NC-SA.

关键词： Wireless networks

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A Trinuclear Cobalt Complex Containing Pyridine-Based Pincer Ligand: Synthesis, Structural, and Electrocatalytic Oxygen Reduction Studies

SSRN

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SSRN 2024年

作者： Manohar, Ezhava Manu Bukhvalov, Danil W. Kan, Dong-Won Han, HyukSu Choi, Hyosung Gaur, Ashish Tothadi, Srinu Roy, Soumalya Joshi, Ankit kumar Bandyopadhyay, Sujoy Das, Sourav Department of Basic Sciences Chemistry Discipline Institute of Infrastructure Technology Research And Management Near Khokhra Circle Maninagar East Gujarat Ahmedabad380026 India Department of Energy Science Sungkyunkwan University Suwon16419 Korea Republic of Department of Chemistry Chonnam National University Hospital 77 Yongbong-ro Buk-gu Gwangju61186 Korea Republic of Analytical and Environmental Sciences Division and Centralized Instrumentation Facility CSIR-Central Salt and Marine Chemicals Research Institute Gijubhai Badheka Marg Bhavnagar364002 India College of Science Institute of Materials Physics and Chemistry Nanjing Forestry University Nanjing210037 China Institute of Physics and Technology Ural Federal University Yekaterinburg620002 Russia School of Energy Systems Engineering Chung-Ang University Seoul06974 Korea Republic of Department of Chemistry Research Institute for Convergence of Basic Science Research Institute for Natural Sciences Hanyang University Seoul04763 Korea Republic of Department of Chemistry Indrashil University Kadi Mehsana Gujarat Rajpur382740 India

The reaction between pentadentate multistage coordinating organic ligands such as 2,2′-[{(1E,1′E)-pyridine-2,6-diyl-bis(methaneylylidene)bis(azaneylylidene)} diphenol] (LH2) with Co(ClO4)***2O in the presence of acetonitrile (MeCN) forms a trinuclear coordination complex, [Co3(L)2(CH3CN)5]∙2ClO4 (1). Single crystal X-ray analysis revealed that complex 1 crystallized in a monoclinic system with space group P2/n (Z = 2). Complex 1 consisted of three CoII metal ions with two deprotonated ligands and two perchlorates as counter-anions. SHAPE analysis studies have shown that CoII has distorted trigonal bipyramidal geometry. Complex 1 demonstrated an electrocatalytic oxygen reduction reaction is 0.52 V at a limiting current density of 1.17 mA cm -2. Furthermore, the Tafel slope was calculated for the catalyst and the obtained Tafel slope was 136 mV dec. The electrocatalytic oxygen reduction was rationalized by DFT studies. © 2024, The Authors. All rights reserved.

关键词： Pyridine

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