신호산성 과립세포종에 관한 고찰

이영중,윤종섭,전완기,양거영,박영의 한림대학교의료원 1986 人間科學 Vol.10 No.2

대장 및 직장암의 대장조영 소견

이영중 대한영상의학회 1984 대한영상의학회지 Vol.20 No.2

The incidence of colorectal cancer of Korea is much lower than that of Western countries, but has shown a tendency to a slight increase recently. Barium enema is the most valuable, noninvasive and inexpensive method available to evaluate the size, shape and site of colorectal cancer. The authors reviewed and radiologically classified barium enema studies of 232 cases of colorectal cancer from Aug. 1967 to July 1982 at Presbyterian Medical Center, jeon-ju, Confirmed clinically, operatively and pathologically. The results were as follows; 1. The ratio of male and female was 1.3:1, and youngest was 13 year-old and the oldest 86 year-old. 2. The peak incidence occured from 5th to 7th decades, accounting for 78% of all cases (181/232), and there was a relatively high incidence of the disease in patients below 30 years of age at 7.8% (18/232) 5. The radiologic findings were classified into 4 groups, and they were annular encircling 62.9%(146/232), polypoid fungating 26.8% (62/232), infiltrating 8.6% (20/232), and primary ulcerating 1.7% (4/232) in order of frequency. 6. The linear length of the cancer ranged from 1.5cm to 15cm and the average length was 5.5cm. 7. There was no statistical correlation between the length of lesion, the site, and the radiologic findings, and stages of the lesion (p:0.750-0.250) 8. The majority of colorectal cancers was adenocarcinoma (217/232:93.6%)

W-CU 복합재료의 전도도에 미치는 미세조직의 영향

이영중,박광현,이병훈,김덕수,김영도,Lee Young Jung,Park Kwang Hyun,Lee Byung Hoon,Kim Deok-Soo,Kim Young Do 한국재료학회 2005 한국재료학회지 Vol.15 No.2

[ $W-15wt.\%$ ] Cu nanocomposite powders are fabricated by ball-milling and subsequent hydrogen-reduction. The compacted parts of $W-15wt.\%Cu$ nanocomposite powders were sintered at $1200^{\circ}C$ for 1 h with various heating rates of 5 and $20^{\circ}C/min$. The homogeneity of the sintered microstructures was evaluated through homogeneity index by the standard deviation of Victor's hardness test. The W-W contiguities were calculated by using Voronoi diagrams. The sintered microstructure with the heating rate of $20^{\circ}C/min$ was more homogeneous and had lower W-W contiguity than that of $5^{\circ}C/min$. The microstructural homogeneity was directly related to the W-W contiguity. Thermal conductivity of the sintered parts with the heating rate of $20^{\circ}C/min$ was higher than that with heating rate of $5^{\circ}C/min$. This phenomenon indicates that the thermal conductivity is affected by the W-W contiguity resulting from the homogeneity of the sintered microstructure.

VHF 데이터통신 통달거리 요소 분석

이영중,김인선,박주래 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3

An Estimation of VHF data link range for EW(Electronic Warfare) equipment in the sea environment was studied to predict the data link range between transmitting and receiving station. The theoretical estimation predicts within 3% error with actual measurement of VHF data link range at sea. Data link range factors including refraction and reflection are added in the basic wave propagation equation. The effect of refraction and reflection to the range is analysed with quantity level.

Complementary Pass-Transistor Logic 회로의 모델링 및 최적 사이징 ( The Modeling and Optimal Sizing of Complementary Pass-Transistor Logic Circuits )

이영중,정항근 한국통신학회 1997 한국통신학회 학술대회논문집 Vol.16 No.3

항공용 전자전장비의 방향탐지 정확도 분석기법

이영중,김인선,박주래,Lee, Young-Joong,Kim, In-Seon,Park, Joo-Rae 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.6

The helicopter position, heading data and the direction finding data of ESM are essentially required to compensate the parallax and analyze the direction finding accuracy of heliborne ESM in flight test phase. In the case of the long test range compared with small platform like as LYNX helicopter and Jisim Island test site, the parallax compensation for direction finding accuracy calculation and GPS position error can be neglected. In this paper, the direction finding accuracy on the basis of helicopter propeller was calculated by coordinate changing between helicopter and transmitting antenna from WGS84 coordinate to navigation coordinate using helicopter position and direction finding data.

ErAs 나노입자가 첨가된 InGaAlAs 박막의 평면정렬방향으로의 열전특성

이영중,Lee, Yong-Joong 한국재료학회 2011 한국재료학회지 Vol.21 No.8

Microelectromechanical systems (MEMS)-fabricated suspended devices were used to measure the in-plane electrical conductivity, Seebeck coefficient, and thermal conductivity of 304 nm and 516 nm thick InGaAlAs films with 0.3% ErAs nanoparticle inclusions by volume. The suspended device allows comprehensive thermoelectric property measurements from a single thin film or nanowire sample. Both thin film samples have identical material compositions and the sole difference is in the sample thickness. The measured Seebeck coefficient, electrical conductivity, and thermal conductivity were all larger in magnitude for the thicker sample. While the relative change in values was dependent on the temperature, the thermal conductivity demonstrated the largest decrease for the thinner sample in the measurement temperature range of 325 K to 425 K. This could be a result of the increased phonon scattering due to the surface defects and included ErAs nanoparticles. Similar to the results from other material systems, the combination of the measured data resulted in higher values of the thermoelectric figure of merit (ZT) for the thinner sample; this result supports the theory that the reduced dimensionality, such as in twodimensional thin films or one-dimensional nanowires, can enhance the thermoelectric figure of merit compared with bulk threedimensional materials. The results strengthen and provide a possible direction in locating and optimizing thermoelectric materials for energy applications.

알루미늄칩과 타공판을 이용한 방음벽 충진재의 흡음특성

이영중,김대건,박경화,김영도,Lee, Young-Jung,Kim, Dae-Gun,Park, Kyung-Hwa,Kim, Young-Do 한국재료학회 2009 한국재료학회지 Vol.19 No.7

Efforts to reduce noise in industrial application fields, such as automobiles, aircrafts, and plants have been gaining considerable attention while a sound proof wall to protect people from the noise has been intensively investigated by many researchers. In this study, our research group suggested creating a new sound proof wall composed of scrap aluminum chips and perforated plates in a commercial polyester sound proof wall, which was then successfully fabricated. This wall's sound absorption characteristics were measured by an impedance tube method. The sound absorption property was evaluated by measuring the Noise Reduction Coefficient (NRC) to the standard, ASTM C 423-90a. The noise reduction coefficient of the sound proof wall composed of 3.5 vol.% and 7.5 vol.% of scrap aluminum chips relatively increased to 5% and 8% compared to the commercial polyester sound proof wall. The scrap aluminum perforated plate also relatively increased to 13% compared to the commercial polyester sound proof wall.

SAR 위성에 대한 재밍 효과 분석

이영중,김인선,박주래,곽현규,신욱현,Lee, Young-Joong,Kim, In-Seon,Park, Joo-Rae,Kwak, Hyun-Kyu,Shin, Wook-Hyun 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.2

SAR has pulse compression gain through the process including range and azimuth. Efficient jammers against the SAR with simulated elements are evaluated in the view of power and SAR image. In this paper, J/S is analysed for SAR with RF propagation equation firstly. Several jamming signals on SAR signal are made into SAR image through pulse compression process. Objective jamming performance is evaluated using euclidean distance.

다중 대역 이동 통신 단말기용 내장형 루프 안테나 설계

이영중,이진성,정병운,박면주,이병제,Lee Young-Joong,Lee Jin-Sung,Jung Byungwoon,Park Myun-Joo,Lee Byungje 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.9

본 논문에서는 4중 대역 이동 통신 단말기에서 사용할 수 있는 내장형 안테나를 설계, 제작하였다. 안테나의 동작 주파수 대역은 GSM(880 MHz${\~}$960 MHz), GPS(1,575 MHz$\pm$10 MHz), DCS(1,710 MHz${\~}$l,880 MHz) 그리고 US-PCS(1,850 MHz${\~}$l,990 MHz) 등을 포함한다. 제안된 안테나는 하나의 급전과 단락 그리고 접혀진 루프 형태의 방사체로 구성되어 있으며 루프형 방사체에 형성되는 기본 모드와 고차 모드들을 이용하여 다중 대역 특성을 만들었다. 안테나에서는 모드별 공진 주파수 조절을 위해 방사체의 특정 부분에 전류 분포 분석을 바탕으로 각기 다른 크기의 슬롯을 삽입하였고, 전방향성 방사 패턴 특성을 위해 방사체의 구조를 좌우 대칭형의 접혀진 루프 형태로 설계하여 방사체에 대칭적인 에너지 분포를 가지게 하였다. 제안된 안테나는 대역폭 향상을 위해 안테나의 아랫부분의 접지면을 제거하였으며 제작된 안테나의 측정된 임피던스 대역폭은 GSM 대역에서 정재파비 2.5 : 1 기준으로 $10.1\%$이고, GPS 대역 및 DCS/US-PCS 대역에서 정재파비 2.5 : 1 기준으로 $26.8\%$이다. 안테나의 수평면 방사 패턴 최대 이득은 전 대역에서 -0.37 dBi${\~}$2.55 dBi로 측정되었다. In this paper, the quad-band antenna for mobile handsets is proposed and developed. The operating frequency bands include GSM(880 MHz${\~}$960 MHz), GPS(1,575 MHz$\pm$10 MHz), DCS(1,710 MHz${\~}$l,880MHz), and PCS(1,850 MHz${\~}$l,990 MHz). The proposed antenna consists of a feed line, a shorting post, and a radiating element of the feed loop. The multi-band operation is achieved by using the fundamental and higher resonant modes of the radiating element. Based on analysis of the current distribution on the radiator, the resonant frequency of each mode can be adjusted by adding the different sizes of slots on the radiator. The radiator of the feed loop is designed to be symmetrical so that the energy is symmetrically distributed on the radiator, which results in omni-directional radiation pattern. The ground plane under the radiator is removed in order to improve the bandwidth. The measured impedance bandwidths are $10.1\%$ in GSM band(VSWR<2.5), $26.8\%$ in GPS band, and DCS/US-PCS bands(VSWR<2.5), respectively. The maximum gains on the H-plane of the fabricated antenna are measured about -0.37 dBi${\~}$2.55 dBi for all operating frequency bands.