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Self‑Powered Airflow Sensor Based on Energy Harvesting of Ventilation Air in Buildings

Advanced Fiber Materials 2023年第5期5卷 1788-1798页

作者： Moon Hyun Chung seunghwan yoo Woo‑Nam Jung Hakgeun Jeong Kyung‑Hwa yoo Department of Physics Yonsei University50 Yonsei‑RoSeodaemun‑GuSeoul 03722Republic of Korea Energy ICT Convergence Research Department Energy Efficiency Research DivisionKorea Institute of Energy Research152 Gajeong‑RoYuseong‑GuDaejeon 34129Republic of Korea Advanced Combustion Power Lab Energy Efficiency Research DivisionKorea Institute of Energy Research152Gajeong‑RoYuseong‑GuDaejeon 34129Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak‑RoYuseongDaejeon 34141Republic of Korea

Heating,ventilation,and air conditioning(HVAC)systems account for one-third of the total energy consumption in office *** use of airflow measurements to control the operation of HVAC systems can reduce energy consumption;thus,a sensor capable of monitoring airflow in a duct system is *** nanogenerators(TENGs)can be utilized as self-powered sensors in airflow-driven TENGs(ATENGs)as self-powered *** employing ferroelectric materials and surface modifications,the surface charges of TENGs can be *** this study,fibrous-mat TENGs were prepared using ferroelectric materials consisting of poly(vinylidene fluoride-co-trifluoroethylene)(PVDF-TrFE)and polyamide 11(nylon-11).And these materials were subsequently ***(3,4-ethylenedioxythiophene):poly(styrenesulfonate)was added to PVDF-TrFE to enhance the ferroelectric crystalline phase.X-ray diffraction analysis revealed that this incorporation affects theβ*** addition,the surface of nylon-11 was modified using the electrospray technique for post-treatment,thereby improving the interfacial adhesion between the *** materials were then utilized in fibrous-mat ATENGs(FM-ATENGs)to demonstrate their practical *** FM-ATENGs can be effectively used in an Arduino airflowcheck sensor,showcasing their potential for application in HVAC systems,to enhance airflow control and energy efficiency.

关键词： HVAC Airflow-driven triboelectric nanogenerator Building energy harvesting Fibrous mat Airflow sensor

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Self-Organized Cluster Based Multi-Hop Routing for Wireless Sensor Networks

Self-Organized Cluster Based Multi-Hop Routing for Wireless ...

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The 11th Asia-Pacific Network Operations and Management Symposium

作者： Hongjoong Sin Sungju Lee Jangsu Lee seunghwan yoo Sanghyuc Lee Jaesik Lee Sungchun Kim Department of Computer Science and Engineering Sogang Univ. CPO Box 1142SeoulKorea

It is difficult to apply other criteria techniques into wireless sensor networks. Since, sensor nodes are generally very small and have scarce resources. The energy efficient routing to prolong the life time is the major research issue in wireless sensor networks. Many researches proposed cluster- based schemes to reduce energy dissipation. These schemes have to maintain the information of overall nodes or create an imbalanced cluster formation. To solve these problems, we propose a self-organized clustering based on the multi-hop routing. In our proposed scheme, clusters are organized efficiently through the extension of clusters in distributed way without any location data. According to performance evaluation using NS-2, the proposed scheme increase the network lifetime longer than the previous schemes.

关键词： Wireless Sensor Networks Multi-hop Routing Clustering

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Multifunctional MXene/Carbon Nanotube Janus Film for Electromagnetic Shielding and Infrared Shielding/Detection in Harsh Environments

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Nano-Micro Letters 2024年第10期16卷 543-560页

作者： Tufail Hassan Aamir Iqbal Byungkwon yoo Jun Young Jo Nilufer Cakmakci Shabbir Madad Naqvi Hyerim Kim Sungmin Jung Noushad Hussain Ujala Zafar Soo Yeong Cho seunghwan Jeong Jaewoo Kim Jung Min Oh Sangwoon Park Youngjin Jeong Chong Min Koo School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySeobu-ro 2066Jangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of Materials Science and Engineering Soongsil UniversitySeoul 06978Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and Technology92 Chudong-roBongdong-eupWanju-gunJeollabuk-do 55324Republic of Korea R&D Center INNOMXENE Co. Ltd.Daejeon 34365Republic of Korea School of Chemical Engineering Sungkyunkwan UniversitySeobu-ro 2066Jangan-guSuwon-siGyeonggi-do 16419Republic of Korea

Multifunctional,flexible,and robust thin films capable of operating in demanding harsh temperature environments are crucial for various cutting-edge *** study presents a multifunctional Janus film integrating highly-crystalline Ti_(3)C_(2)T_(x) MXene and mechanically-robust carbon nanotube(CNT)film through strong hydrogen *** hybrid film not only exhibits high electrical conductivity(4250 S cm^(-1)),but also demonstrates robust mechanical strength and durability in both extremely low and high temperature environments,showing exceptional resistance to thermal *** hybrid Janus film of 15μm thickness reveals remarkable multifunctionality,including efficient electromagnetic shielding effectiveness of 72 dB in X band frequency range,excellent infrared(IR)shielding capability with an average emissivity of 0.09(a minimal value of 0.02),superior thermal camouflage performance over a wide temperature range(−1 to 300℃)achieving a notable reduction in the radiated temperature by 243℃ against a background temperature of 300℃,and outstanding IR detection capability characterized by a 44%increase in resistance when exposed to 250 W IR *** multifunctional MXene/CNT Janus film offers a feasible solution for electromagnetic shielding and IR shielding/detection under challenging conditions.

关键词： MXene/carbon nanotube Janus film Electromagnetic interference shielding Infrared shielding Thermal camouflage Infrared detection

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Ultra-thin light-weight laser-induced-graphene (LIG) diffractive optics

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Light(Science & Applications) 2023年第7期12卷 1268-1300页

作者： Younggeun Lee Mun Ji Low Dongwook Yang Han Ku Nam Truong-Son Dinh Le Seung Eon Lee Hyogeun Han seunghwan Kim Quang Huy Vu Hongki yoo Hyosang yoon Joohyung Lee Suchand Sandeep Keunwoo Lee Seung-Woo Kim Young-Jin Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daehak-roYuseong-guDaejeon 34141Republic of Korea School of Mechanical and Aerospace Engineering Nanyang Technological University(NTU)50 Nanyang Avenue639798 SingaporeSingapore Panasonic Factory Solutions Asia Pacific(PFSAP) 285 Jalan Ahmad Ibrahim639931 SingaporeSingapore Department of Aerospace Engineering Korea Advanced Institute of Science and Technology(KAlST)Daehak-roYuseong-guDaejeon 34141Republic of Korea Department of Mechanical System Design Engineering Seoul National University of Science and Technology(Seuoltech)232 Gongneung-roNowon-guSeoul 01811Republic of Korea LASER N GRAPN INC 193 Munj-roYuseong-guDaejeon 34051Republicof Korea

The realization of hybrid optics could be one of the best ways to fulfll the technological requirements of compact,light-weight,and multi-functional optical systems for modern *** diffractive lens(PDL)such as diffractive lenses,photonsieves,and metasurfaces can be patterned on ultra-thin flexible and stretchable substrates and be conformally attached on top of arbitrarily shaped *** this review,we introduce recent research works addressed to the design and manufacturing of ultra-thin graphene optics,which will open new markets in compact and light-weight optics for next-generation endoscopic brain imaging,space internet,real-time surface proflometry,and multi-functional mobile *** provide higher design flexibility,lower process complexity,and chemical-free process with reasonable investment cost,direct laser writing(DLW)of laser-induced-graphene(LIG)is actively being applied to the patterning of *** realizing the best optical performances in DLW,photon-material interactions have been studied in detail with respect to different laser parameters;the resulting optical characteristics have been evaluated in terms of amplitude and phase.A series of exemplary laser-written 1D and 2D PDL structures have been actively demonstrated with different base materials,and then,the cases are being expanded to plasmonic and holographic *** combination of these ultra-thin and light-weight PDL with conventional bulk refractive or reflective optical elements could bring together the advantages of each optical *** integrating these suggestions,we suggest a way to realize the hybrid PDL to be used in the future micro-electronics surface inspection,biomedical,outer space,and extended reality(XR)industries.

关键词： optics weight holographic

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