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3-Way Doherty 증폭기의 선형성 및 효율 개선에 관한 연구
홍용의,양승인,Hong Yong-Eui,Yang Seung-In 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.2
본 논문에서는 CMRC(Compact Microstrip Resonants Cell)를 이용한 직렬 구조의 3-Way 도허티 증폭기를 연구하였다. CMRC는 선형성과 효율의 개선뿐만 아니라 기존의 선형성 개선 방법보다 간단하며 크기가 작고 가격이 저렴하다는 장점이 있다. 또한 기존의 병렬 구조의 3-way 도허티 증폭기가 아닌 하나의 디바이더만을 사용하는 직렬 구조의 3-Way 도허티 증폭기를 통해 그 크기를 줄일 수 있었다. 그 결과 CMRC를 사용한 제안된 3-Way 도허티 증폭기는 IMD3를 약 4.5 dB, PAE는 약 $9.2\%$ 개선시킬 수 있었다. In this paper, Compact Microstrip Resonant Cell(CMRC)s have been employed to suppress IMD(Intermodulation Distortion) of the 3-Way Doherty amplifier. This method can not only improve the linearity and the efficiency but also be simpler, smaller and more inexpensive than existing linearity methods; (for example harmonic feedback, back off, feed-forward, predistortion and so on) Also, using only one divider reduces the size of the proposed 3-Way Doherty amplifier. As a result, the IMD3 and the PAE have been improved by 4.5 dB and by $9.2\%$, respectively, using the proposed Doherty amplifier with CMRC.
Taxonomic Review of the Family Lumbricidae (Oligochaeta) in Korea
홍용,Hong, Yong The Korean Society of Systematic Zoology 2000 Animal Systematics, Evolution and Diversity Vol.16 No.1
1996년부터 1998년까지 저자가 직접 채집한 표본과 송의 표본(1965-1971)을 동정 분류한 결과 낚시지렁이과의 한국미기록 1종, 혹낚시지렁이 Aporrectodea tuberculata을 포함한 7종을 확인하였다. 한국산 낚시지렁이는 3속 10종이 된다. Seven species of the Korean Lumbricidae, including a newly recorded species, Aporrectodea tuberculata, are reviewed, with illustrations, descriptions and key of the known species in Korea. Other 3 species of the previously known species of the family were not found in this study.
주기적인 대칭 슬롯을 가진 누설동축 케이블의 전파모드 해석
홍용인,맹명재,김정기 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.9
In indoor radio systems, vehicular communication systems, and land mobile systems, a very important problem is that of maintaining stable communications at all locations. Therefore solutions for the indoor propagation problem are important aspects of the mobile communication system. leaky coxial cables are finding increasing use in communications systesm involving mines, tunnels, tailroads, and highways, and in new obstacle detection, or guided radar, schemes for ground transportation and perimenter surveilance. In this paper a leaky coaxial cable having periodic slots in the outer conductor is described to obtain the propagation modes in the various environments. We use aneccentric cylindrical model to develop the theory for surface-wave propagation on the cable. Numerical Results are also included for the propagation constants, field distribution and current distribution. First, we derive the electromagnetic equation for leaky coaxial cable having symmetrical periodic slots using mode-matching method and Floquet's theorem, and then find various modes, propagation constants, field distribution, etc.
유한차분 시간영역 알고리듬을 이용한 누설 동축 케이블의 전자파 특성에 관한 연구
홍용인,김정기 한국통신학회 1996 韓國通信學會論文誌 Vol.21 No.11
In this paper, the electromagnetic field characteristics of leaky caxial cable are anlyzed by using the finite difference-time domain(FDTD) technique. Finite difference equations of Maxwell's equations are definedin cylindrical coordinate systems. To simulate the open boundary problem like a free space, the Mur's Absorbing Boundary condition(Mur-ABC) is also used. After modeling the leaky coaxial cable with the three dimensional grid structure, the transient response of the field distribution and the current distribution, the field pattern, the coupling effect are depicted in the time domain.
지리산 고도에 따른 토양서식성 앉은뱅이(거미강)의 월별 개체군 밀도 변화
홍용,김태흥,김창환,Hong, Yong,Kim, Tae-Heung,Kim, Chang-Hwan 한국생태학회 1997 Journal of Ecology and Environment Vol.20 No.5
Seasonal fluctuations in density of soil-inhabiting Pseudoscorpions at the Piagol, Mt. Chiri were assessed on the basis of 4,984 individuals collected from March 1993 to February 1995. They encompassed 2 families, 6 genera and 11 species. Species composition and abundance were as follows: Allochthonius buanensis 47.0%, Microcreagris sp. 2. 20.7%, Microcreagris pygmaea 12.9%, Microcreagris japonica 9.8%, Pararoncus japonicus 3.7%, Mundochthonius minusculus 3.2%, Parobisium longipalpus 1.2%, Microbisium pygmaeum 1.0%, Allochthonius coreanus 0.2%, Microcreagris sp. 1 0.2%, and Parobisium robustiella 0.1%. Diversity index (H') decreased and dominance index (C) increased at the height of 1,200 m. The heights of 500 m. The heights of 500 m and 600 m were dominated heavily by A. buanensis and abundance of M. japonical and Microcreagris sp. 2 was also comparatively high and H' was high in March and April, low in August and September. in case of May, Jun., Jul., Oct., Nov., Dec., Jan. 1993, and Feb. 1994, H' stayed at a relatively constant level. A total of 4,984 individuals including 1,170 protonymphs (23.5%), 1,251 deutonymphs (25.1%), 533 tritonymphs (10.7%), and 2,030 adults (40.7%) was collected from the study sites. Sex ratio of the Pseudoscorpions was approximately 1 female : 1.1 male.
홍용 한국환경생물학회 2014 환경생물 : 환경생물학회지 Vol.32 No.3
농생태계의 뽕나무 경작지에서 서식하고 있는 지렁이 상을 확인하기 위하여, 2013년 4월부터 2014년 3월까지 조사를 하였다. 분류된 남방계지렁이는 총 5속 9종으로 다음과 같다. Aporrectodea caliginosa (Savigny, 1826), Bimastos parvus (Eisen, 1874), Eisenia fetida (Savigny, 18 26), Drawida japonica (Michaelsen, 1892), Amynthas heteropodus (Goto & Hatai, 1898), Amynthas agrestis (Goto & Hatai, 1899), Amynthas corticis (Kinberg, 1867), Amynthas hilgendorfi (Michaelsen, 1895), Amynthas sp. 등이다. 장미 줄지렁이 (Ap. caliginosa) 개체군 밀도 소장은 10월에 정 점을 보이고 다음해 2월까지 감소하고, 성체와 미성체는 동시에 출현하며, 그들의 조성 비율은 성체 11.4%, 준성 체 12.6 11%, 미성체 76% 이었다. In this study, I investigated the species composition in the Mulberry tree cultivation area from April 2013 to March 2014 at Busan. Five genera and nine species found are as follows: Aporrectodea caliginosa (Savigny, 1826), Bimastos parvus (Eisen, 1874), Eisenia fetida (Savigny, 1826), Drawida japonica (Michaelsen, 1892), Amynthas heteropodus (Goto&Hatai, 1898), Amynthas agrestis (Goto & Hatai, 1899), Amynthas corticis (Kinberg, 1867), Amynthas hilgendorfi (Michaelsen, 1895), and Amynthas sp. A total of 317 individuals of Aporrectodea caliginosa (Savigny, 1826) was collected. Ap. caligionosa and A. heteropodus were found to be the most dominant species during the study period. Interestingly, the maximum population density of Ap. caligionosa was recorded to be in the month of October. Further details analysis indicated that, its population increased rapidly during the breeding season between summer and autumn and thereafter gradually decreased through winter toward the following February. Three growth stages of Ap. caligionosa occurred almost simultaneously with abundance composition of 76% in aclitellum, 12.6% in semiclitellum, and 11.4% in clitellum. Based on my study results, I suggest that this data could be useful for the scientific community to analyze the distribution of southern earthworm species in mulberry tree cultivation area.