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마이크로파 대역에서 실내 환경의 경로손실인자를 사용한 통계적 모델링
이권익,홍석욱,강부식,김흥수 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.1
In this paper, indoor propagation characteristics are analyzed for various environments such as corridors, walls and corners at microwave band. In order to present the statistical model for indoor environments the loss factors of each case are obtained by linear regression analysis method with the function of logarithmic distance between transmitter and receiver. Comparisons of our predicted results to measurements indicate that improvements in accuracy over conventional statistical models are achieved.
권익호(權益湖),송숙정(宋淑正) 중앙대학교 일본연구소 2013 日本 硏究 Vol.0 No.34
This study verified through the used sentences whether the word ‘日本", employed in the catchphrases in Japanese newspaper advertisements, plays the role of a linguistic sign with connotations. As a result, it is known that the connotation of the word ‘日本" serves as an ideological subject to be protected, saved and safeguarded, identified with the world as the supreme value, getting beyond Japan and the image based on the national value. The research further shows that ‘日本’ implies a stronger connotation when pronounced as ‘にっぽん’ than when pronounced as ‘にほん’, and in a sentence in which the state ideology of nationalism is strongly expressed, ‘日本 is pronounced as ‘にっぽん". The study also shows that the word ‘日本’ as a linguistic sign has developed into a myth through the interaction with the signs connected with each other.
무선 LAN용 개구결합 마이크로스트립 원통형 유전체 공진 안테나 설계 및 제작
이권익,김흥수 한국전자파학회 2001 한국전자파학회논문지 Vol.12 No.3
비유전율 ${\epsilon}_{r}$=36인 유전체를 이용한 무선 LAN용 개구 결합 마이크로스트립 원통형 유전체 공진 안테나(DRA)를 설계하고 제작하였다. 우선 급전 소자는 마이크로스트립 전송선로 이론을 이용하여 급전 선로 길이, 선로 폭, 슬롯 길이, 슬롯 폿과 스터브 길이을 계산하였다. 방사 소자는 원통형 유전체 cavity 이론을 이용하여 설계하였다. 제작된 원통형 DRA의 공진주파수는 2.449 GHz이고 VSWR, 반사 손실과 대역폭은 각각 1.009, -47dB 와 70MHz이다. 방사 패턴의 전후방비는 13dB이고 E면과 H 면의 3dB 빔폭은 각각 1$10^{\circ}$과 90$^{\circ}$이다. In this paper, on aperture-coupled microstrip cylindrical dielectric resonant antenna(DRA) consisting of dielectric material with permittivity ${\epsilon}_{r}$ = 36 is designed and fabricated fir wireless LAN. First of all, the feedline length, width, slot length and width of the feeding element were calculated using the theory of microstrip transmission line. Radiation element is designed using the theory of cylindrical dielectric cavity, Resonant frequency of the fabricated cylindrical DRA is 2.449 GHz and VSWR, return loss and bandwidth is 1.009, -47 dB and 70 MHz, respectively. Front-to-back radiation ratio is about 12 dB and 3 dB beamwidth of E-plane and H-plane is 110$^{\circ}$ and 90$^{\circ}$ , respectively.
이권익,김흥수 濟州大學校 情報通信硏究所 1999 情報通信硏究所論文集 Vol.2 No.-
In this paper. finite-difference time-domain(FDTD) method is employed to analyze a probe-fed cylindrical dielectric resonator antenna. The effect of various parameters on the characteristics of the DR antenna are studied. The impedance matching of the antenna can be accomplished by adjusting the position b and the length l of the coaxial probe. As ε_(r) is increased. the resonanat frequency decreases and the value of the input impedance increases.
이권익,김흥수 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2
In this paper, the printed dipole array antenna is designed and fabricated for an access point of wireless local area network(2.4-2.5 ㎓). After designing a half-wavelength end-fed microstrip patch, this patch is transformed to a center fed dipole antenna. The balun is designed to connect between a microstrip feed line and a radiation element and to obtain sufficient frequency bandwidth. In order to obtain the directivity characteristics and high gain, dipole element is arrayed vertically and attached a conductor reflector. Measuring result, the center frequency is 2.46㎓ and the bandwidth is 19.5%. The 3 ㏈ beamwidth of E-plane and H-plane are 24 and 60 degree, respectively.
이권익,유재준,류승훈 慶熙大學校 材料科學技術硏究所 1996 材料科學技術硏究論集 Vol.9 No.-
Dynamic crystallization and melting behavior of LLDPEs with butene-1 copolymer was studied. Crystallization and melting temperature was decreased with increasing cooling rate for low comonomer concentration LLDPEs. However, no significant variation of crystallization and melting temperature was observed for high comonomer concenration LLDPEs. It was observed that crystallization and melting behavior were strongly dependent on the concentration of comonomer rather than a molecular weight. From the thermal behaviors and WAXS study, it was found that high comonomer concentration LLDPE experience the different crystal formation process.