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전체 선택해제
총 105건 검색
본문검색 결과만 보기
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Flexural, electrical, thermal and electromagnetic interference shielding properties of xGnP and carbon nanotube filled epoxy hybrid nanocomposites
Young Sil Lee, Yeon Ho Park, Kwan Han Yoon 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 6 41-46 (6 pages)
The microstructure, flexural properties, electrical conductivity, thermal conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of epoxy composites filled with multi-walled carbon nanotubes (CNTs), exfoliated graphite nanoplatelets (xGnPs) and CNT-xGnP hybrid filler were investigated. The EMI SE of the CNT-xGnP hybrid composite was higher than 25 dB at 100 MHz while that of the xGnP based composite was almost zero. The flexural modulus of the CNT-xGnP based epoxy... -
Electromagnetic Interference Reflectivity of Nanostructured Manganese Ferrite Reinforced Polypyrrole Composites
Chakraborty. Himel, Chabri. Sumit, Bhowmik. Nandagopal 한국전기전자재료학회 Transactions on electrical and electronic materials 4 Pages
한국전기전자재료학회 Transactions on electrical and electronic materials 2013, Vol.14 No.6 295-298 (4 pages)
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Electromagnetic Interference Shielding Effectiveness of Electroless Nickel-plated MWCNTs/CFs-reinforced HDPE Matrix Composites
Choi. Woong-Ki, Hong. Myung-Sun, Lee. Hae-Seong, An. Kay-Hyeok, Bang. Joon-Hyuk, Lee. Young Sil, Kim. Byung-Joo 대한화학회 Bulletin of the Korean Chemical Society 4 Pages
대한화학회 Bulletin of the Korean Chemical Society 2014, Vol.35 No.2 597-600 (4 pages)
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Analysis of Radio Interference through Ducting for 2.5 GHz WiMAX Service
Son. Ho-Kyung, Kim. Jong-Ho, Kim. Che-Young 한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 7 Pages
한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 2012, Vol.12 No.1 94-100 (7 pages)
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Interference Tolerant Based CR System with Imperfect Channel State Information at the CR-Transmitter
Asaduzzaman. Asaduzzaman, Kong. Hyung-Yun 한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 5 Pages
한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 2011, Vol.11 No.2 128-132 (5 pages)
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Boosting the Uplink Throughput of OFDM Systems by Creating Resolvable Interference
Mohaisen. Manar, Hui. Bing, Chang. Kyung-Hi 한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 9 Pages
한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 2011, Vol.11 No.2 113-121 (9 pages)
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An Interference Analysis Method with Site-Specific Path Loss Model for Wireless Personal Area Network
Moon. Hyun-Wook, Kwon. Se-Woong, Lee. Jong-Hyun, Yoon. Young-Joong 한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 6 Pages
한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 2010, Vol.10 No.4 290-295 (6 pages)
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Evaluation of Co-Frequency Interference with IMT System Caused by Mobile-Satellite Service System
Park. Jong-Min, Park. Dong-Chul 한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 5 Pages
한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 2009, Vol.9 No.3 141-145 (5 pages)
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Successive Interference Cancellation for the Uplink of MC-CDMA Systems with Multiple Receive Antennas
Kong. Hyung-Yun 한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 5 Pages
한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 2009, Vol.9 No.2 61-65 (5 pages)
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Study on Efficient Frequency Guard Band Decision Rule for Interference Avoidance
Park. Woo-Chul, Kim. Eun-Cheol, Kim. Jin-Young, Kim. Jae-Hyun 한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 6 Pages
한국전자파학회 Journal of the Korean Institute of Electromagnetic Engineering and Science 2009, Vol.9 No.4 182-187 (6 pages)
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Analysis on the Effects of Interference Mitigation for Ultra-wideband Coexistence with BWA
Yoon. Young-Keun, Jin. Hong-Heon, Choi. Ik-Guen 한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 6 Pages
한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 2006, Vol.6 No.2 117-122 (6 pages)
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The Interference Measurement Analysis between 3.412 GHz Band Broadcasting System and UWB Wireless Communication System
Song. Hong-Jong, Kim. Dong-Ku 한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 6 Pages
한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 2006, Vol.6 No.1 76-81 (6 pages)
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Analysis of Interference Impacts by UWB System to WiBro Systems
Yoon. Young-Keun, Jin. Rong-Reon, Kim. Kyung-Seok, Choi. Ik-Guen 한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 7 Pages
한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 2005, Vol.5 No.4 197-203 (7 pages)
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Measured Return Loss and Predicted Interference Level of PCB Integrated Filtering Antenna at Millimeter-Wave
Lee. Jae-Wook, Kim. Bong-Soo, Song. Myung-Sun 한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 6 Pages
한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 2005, Vol.5 No.3 140-145 (6 pages)
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Performance Improvement of a STTD Receiver without the Mutual Interference of Antenna
Woo. Byung-Hoon, Baek. Seung-Sun, Kang. Heau-Jo 한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 5 Pages
한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 2003, Vol.3 No.2 99-103 (5 pages)
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Electromagnetic Topology를 이용한 능동소자가 포함된 회로의 동작 특성 해석
권오욱, 박윤미, 정용식, 천창율, 정현교, Kwon. Oh-Wook, Park. Yoon-Mi, Chung. Young-Seek, Cheon. Chang-Yul, Jung. Hyun-Kyo 대한전기학회 전기학회논문지= The Transactions of the Korean Institute of Electrical Engineers 6 Pages
대한전기학회 전기학회논문지= The Transactions of the Korean Institute of Electrical Engineers 2008, Vol.57 No.5 821-826 (6 pages)
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The Analysis of Protection Ratio and Its Effect of Interference-to-Noise Ratio for Digital Microwave System with Diversity
Suh. Kyoung-Whoan, Jang. Won-Gyu 한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 7 Pages
한국전자파학회 Journal of the Korea Electromagnetic Engineering Society 2006, Vol.6 No.3 189-195 (7 pages)
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LTE-Advanced 네트워크에서 자원관리 기법 성능 분석
문지훈, 임유진 인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 10 Pages
인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 2016, 제 6권 제 1호 2 9-18 (10 pages)
최근 들어 LTE-Advanced 네트워크 환경에서 D2D (Device-to-Device) 통신과 MTC (Machine-Type Communication) 통신에 대한 연구가 활발히 이루어지고 있다. D2D 통신은 사용자 QoS (Quality-of-Service)를 보장하면서도 단말 간의 간섭 또는 셀의 간섭을 최소화시킬 수 있어야 한다. MTC 통신은 기존 셀룰러 사용자들의 QoS를 보장하면서도 많은 수의 MTC 단말들이 동시에 통신망 에 접속함으로서 발생하는 혼잡을 제어할 수 있어야 한다. 본 논문에서는 이 두 가지 통신 환경에서 제안된 자원 관리 기법들의 연구 동향을 소개하고, 특히... -
EMI shielding effectiveness and mechanical properties of MWCNTs-reinforced biodegradable epoxy matrix composites
Yoon-Ji Yim, Dong Chul Chung, Soo-Jin Park 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 4 36-41 (6 pages)
employing dynamic mechanical analysis, critical stress intensity factor (KIC) tests, and impact strength tests. The electromagnetic interference shielding effectiveness (EMI-SE) of the composites was evaluated using reflection and absorption methods. Mechanical properties of MWCNTs/B-epoxy were enhanced with an increase in the MWCNT content, whereas they deteriorated when the MWCNT content was >5 parts per hundred resin (phr). This can likely be attributed to the entanglement of MWCNTs with each... -
The effects of carbon coating onto graphite filler on the structure and properties of carbon foams
Ji-Hyun Kim, Do Young Kim, Young-Seak Lee 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 16 111-115 (5 pages)
Carbon foams (CFms) are of crucial importance in electrical and mechanical devices due to their high thermal conductivity used for eliminating high heat flow and maintaining low temperatures [1]. The most common CFms are types of aluminum alloys, copper and diamond. However, the mechanical properties of metal-based heat sink materials are difficult to control at temperatures over 550°C [2,3]. Thus, CFms are actively investigated as heat sink materials because of their good properties, such as... -
A facile green reduction of graphene oxide using Annona squamosa leaf extract
Basavaiah Chandu, Venkata Sai Sriram Mosali, Bhanu Mullamuri, Hari Babu Bollikolla 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 9 74-80 (7 pages)
A highly facile and eco-friendly green synthesis of Annona squamosa (custard apple) leaf extract reduced graphene oxide (CRG) nanosheets was achieved by the reduction of graphene oxide (GO). The as-prepared CRG was characterized with X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier-transform infrared spectroscopy (FT-IR), ultraviolet-visible (UV-Vis), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopic techniques. Removal of oxygen containing moieties from the... -
Mechanical properties of epoxy composites reinforced with ammonia-treated graphene oxides
Mi-Seon Park, Sangmin Lee, Young-Seak Lee 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 1 1-7 (7 pages)
The effects of ammonia-treated graphene oxide (GO) on composites based on epoxy resin were investigated. Ammonia solutions of different concentrations (14?28%) were used to modify GO. Nitrogen functional groups were introduced on the GO surfaces without significant structural changes. The ammonia-treated GO-based epoxy composites exhibited interesting changes in their mechanical properties related to the presence of nitrogen functional groups, particularly amine (C-NH2) groups on the GO... -
Flexural properties, interlaminar shear strength and morphology of phenolic matrix composites reinforced with xGnP-coated carbon fibers
Jong Kyoo Park, Jae Yeol Lee, Lawrence T. Drzal, Donghwan Cho 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.17 No.1 5 33-38 (6 pages)
In the present study, exfoliated graphite nanoplatelets (xGnP) with different particle sizes were coated onto polyacrylonitrile-based carbon fibers by a direct coating method. The flexural properties, interlaminar shear strength, and the morphology of the xGnP-coated carbon fiber/phenolic matrix composites were investigated in terms of their longitudinal flexural strength and modulus, interlaminar shear strength, and by optical and scanning electron microscopic observations. The results were... -
Characterization and influence of shear flow on the surface resistivity and mixing condition on the dispersion quality of multi-walled carbon nanotube/polycarbonate nanocomposites
Young Sil Lee, Kwan Han Yoon 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 3 86-92 (7 pages)
Multi-walled carbon nanotube (MWCNT)/polycarbonate (PC) nanocomposite was prepared by direct melt mixing to investigate the effect of the shear rate on the surface resistivity of the nanocomposites. In this study, an experiment was carried out to observe the shear induced orientation of the MWCNT in the polymer matrix using a very simple melt flow indexer with various loads. The compression-molded, should be eliminated. MWCNT/PC nanocomposite sample exhibited lower percolation thresholds (at 0.8... -
Preparation and characterization of carbon fiber-reinforced thermosetting composites: a review
Fan-Long Jin, Soo-Jin Park 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 1 67-77 (11 pages)
Carbon fibers (CFs) have a unique combination of properties which allow them to be widely used as reinforcing materials in advanced polymer composites. The mechanical properties of CF-reinforced polymer composites are governed mainly by the quality of interfacial adhesion between the CFs and the polymer matrix. Surface treatments of CFs are generally carried out to introduce chemical functional groups on the fiber surfaces, which provide the ability to control the surface characteristics of CFs.... -
Enhanced electrocapacitive performance and high power density of polypyrrole/graphene oxide nanocomposites prepared at reduced temperature
Harish Mudila, Varsha Joshi, Sweta Rana, Mohmd. Ghulam Haider Zaidi, Sarfaraz Alam 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.3 3 171-179 (9 pages)
An attempt was made to investigate the effect of the preparation temperature on the electrocapacitive performance of polypyrrole (PPY)/graphene oxide (GO) nanocomposites (PNCs). For this purpose, a series of PNCs were prepared at various temperatures by the cetyltrimethylammonium bromide-assisted dilute-solution polymerization of pyrrole in presence of GO (wt%) ranging from 1.0 to 4.0 with ferric chloride as an oxidant. The formation of the PNCs was ascertained through Fourier-transform infrared... -
Study on lowering the percolation threshold of carbon nanotube-filled conductive polypropylene composites
Seung Bin Park, Moo Sung Lee, Min Park 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.2 8 117-124 (8 pages)
Conductive polymer composites (CPCs) consist of a polymeric matrix and a conductive filler, for example, carbon black, carbon fibers, graphite or carbon nanotubes (CNTs). The critical amount of the electrically conductive filler necessary to build up a continuous conductive network, and accordingly, to make the material conductive; is referred to as the percolation threshold. From technical and economical viewpoints, it is desirable to decrease the conductive- filler percolation-threshold as... -
Microwave heating of carbon-based solid materials
Teawon Kim, Jaegeun Lee, Kun Hong Lee 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.1 2 15-24 (10 pages)
of the electromagnetic spectrum, microwaves heat materials fast and efficiently via direct energy transfer, while conventional heating methods rely on conduction and convection. To date, the use of microwave heating in the research of carbon-based materials has been mainly limited to liquid solutions. However, more rapid and efficient heating is possible in electron-rich solid materials, because the target materials absorb the energy of microwaves effectively and exclusively. Carbon-based solid... -
Preparation of Carbon Nanofibers by Catalytic CVD and Their Purification
Jae-Seok Lim, Seong-Young Lee, Sei-Min Park, Myung-Soo Kim 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2005, Vol.6 No.1 5 31-40 (10 pages)
Hughes 등은 철 도가니 안에서 수소와 메탄의 혼합물로부터 모발형상의 기상성장 탄소섬유가 생성한 것을 발견하였고, 섬유는 화학기상증착법에 의해 형성된 직경이 약 20m의 탄소 필라멘트형태임을 보고하였다. 이후에 Davis 등이 전자 현미경을 사용하여 나노 크기의 직경을 가진 탄소 필라멘드를 처음으로 관찰하였고, 현재까지 많은 연구자들이 Ni,Fe,Co 및 이러한 금속들의 합금을 촉매로 이용하여 탄소나노섬유를 성장 시키는 기술을 확립하였다. -
해저케이블의 지연 현상과 전기장 개념이 영국 물리교과서에 도입된 과정에 대한 역사적 탐색
강유진 이화여자대학교 교과교육연구소 교과교육학연구 10 Pages
이화여자대학교 교과교육연구소 교과교육학연구 2019, 제 23권 2호 5 118-127 (10 pages)
본 연구는 학생들의 전기장 관련 오개념을 과학적 개념으로 바꾸는데 필요한 경험적 사건으로써 19세기 후반 해저케이블 건설 도중 문제가 되었던 지연 현상을 제시하려는 연구이다. 장 개념은 고등학교와 대학에서 배우는 것으로 힘 개념이나 유체 개념과 다르지만, 학생들은 구별하지 못하고 혼용하여 오개념을 가지고 있다. 장개념만으로 설명할 수 있는 경험적 사건은 학생들이 장에 대한 과학적 개념을 형성하는데 도움이 될 것이다. 역사적으로 전기장 개념은 19세기 후반기에 기존의 전류 개념 및 원격작용 개념과 맞서거나... -
The History of the Korean Science Curriculum and the Introduction of the Present 2015 Science Curriculum
Ha Minsu 이화여자대학교 교과교육연구소 교과교육학연구 14 Pages
이화여자대학교 교과교육연구소 교과교육학연구 2017, 제 21권 3호 1 171-184 (14 pages)
The purpose of this study is to identify the history of the science curriculum in Korea and to review the science curriculum launched in 2015. Science has become an independent subject from the secondary curriculum for the purposes of developing Korean industry. The third curriculum was published by revising the second curriculum and adding an academic focus. The third curriculum was revised to create the fourth curriculum by introducing the notion of a human-centered curriculum, which is mainly...
