한계 없는 무선통신 실현을 위한 기술 동향

김근영,김광선,명정호,윤찬호,신우람,김철순,고영조,문성현,김경표,김태중,Kim, Keunyoung,Kim, Kwang Seon,Myung, Jungho,Yoon, Chanho,Shin, Wooram,Kim, Cheulsoon,Ko, Young Jo,Moon, Sunghyun,Kim, Kyeongpyo,Kim, Tae Joong 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.1

The capacity of wireless communications has been considered to be restricted by their fundamental limits, which were first formulated by Shannon in 1948. These limits are for the communication environment that is composed of a transmitter and receiver pair. However, there are usually more than one simultaneously communicating pairs in the environment. In such cases, the capacity is not known. Moreover, performance requirements have been diversified with the development of technology. We believe that wireless communication technologies will eventually progress toward limitless connections. Various wireless transmission and access technologies are introduced in order to overcome their limitations.

법원 감정의 문제점 및 해소 방안

김근영,Kim, Geun-Yeong 한국건축구조기술사회 2008 건축구조 Vol.15 No.1

설립 초기의 수련 병원에서의 위암 수술 성적

김근영,유문원,한혜승,윤익진,이경영,Kim, Kun-Young,Yoo, Moon-Won,Han, Hye-Seung,Yun, Ik-Jin,Lee, Kyung-Yung 대한위암학회 2008 대한위암학회지 Vol.8 No.4

목적: 건국대학교병원은 2005년 9월에 개원하여 현재 2차 병원이며 설립 초기에 위암의 수술적 치료 과정에서 비교적 경험이 부족한 전공의와 간호사가 종사하였다. 따라서 건국대학교병원의 위암 수술 성적은 기존에 설립된 대형화된 3차 병원과 다를 수 있다. 이에 건국대학교병원에서 위암을 진단받고 수술을 받은 환자들의 임상병리학적 특성과 수술 후 이환율과 사망률을 기존의 보고된 자료와 비교하고 설립 초기 수련 병원에서 위암 수술 후 발생한 합병증에 영향을 미치는 인자들을 조사해 보고자 하였다. 대상 및 방법: 2005년 9월부터 2008년 4월까지 위암으로 진단받고 건국대학교병원에서 수술 받은 모든 환자를 대상으로 의무기록을 통해 임상병리학적 특징 및 수술 후 이환율과 사망률을 후향적으로 조사하였다. 결과: 건국대학교병원의 이환율과 사망률은 각각 10.4%와 0.5%로 기존에 보고된 자료와 비교해 볼 때 큰 차이는 없는 것으로 생각된다. 연령이 증가할수록 수술 후 이환율이 높아졌다. 그 외 통계적으로 유의하게 수술 후 합병증 발생에 영향을 주는 변수는 없었다. 결론: 설립 초기 수련 병원의 한계점을 가지고 있는 건국대학교병원의 위암 수술환자의 이환율과 사망률, 환자의 임상병리학적 특성은 기존의 보고된 자료와 비교해 볼 때 큰 차이가 없다고 생각된다. 그리고 높은 연령이 위암 수술 후 이환율에 영향을 미치는 인자로 나타났다. 추후 보다 정확한 수술 성적을 위해서 환자의 추적 관찰을 통해 위암으로 수술한 환자의 생존자료의 확보가 요망된다. Konkuk University Hospital (KUH), which opened in September 2005, is currently categorized as a secondary hospital. Early on after its establishment, the surgical residents and nurses were relatively inexperienced in the treatment of stomach cancer. Therefore, the quality of surgery for stomach cancer at KUH may be different from that of the existing large-scale tertiary hospitals. The purpose of this study is first to investigate the clinicopathological characteristics of the gastric cancer patients at the KUH, and second to compare our morbidity & mortality rates with those of previous studies, and we also analyzed the risk factors of morbidity at the early stage of a training hospital. Materials and Methods: This study retrospectively collected the clinicopathological characteristics and the post-operative morbidity rates and mortality rates with using the electronic medical records of all the patients who went under a gastric cancer operation at KUH from September 2005 to April 2008. Results: The total number of gastric cancer patients who underwent operation was 201. The morbidity rate and death rate at KUH were 10.4% and 0.5%, respectively. The morbidity has increased with an older age. The other variables had no influence on morbidity. Conclusion: The morbidity rate, death rate and the clinicopathological characteristics of gastric cancer patients at KUH were similar to those of the previous reports. We found that age is the main factor affecting the morbidity rate after stomach cancer surgery. For further surgical qualification of stomach cancer surgery at KUH, it is necessary to collect the survival data of patients who undergo stomach cancer surgery.

대도시권 시대의 도시정책을 위한 기초지자체 유형 구분

김근영,Kim, Geunyoung 인천대학교 도시과학연구원 2020 도시과학 Vol.9 No.2

The purpose of this study is to present a plan to distinguish 229 local governments nationwide by taking into account various characteristics such as population, employment, housing, and industry of the region for customized urban policies in the era of metropolitan areas. The National Statistical Portal (KOSIS) collected and standardized data related to population, housing, industry, and finance by region from 2000 to 2015 for the classification of regional types necessary for customized urban policies, and this was used to classify them into regional types that considered population, employment, housing and industry. The summary of the analysis results is as follows. First, as a result of the regional type classification, 10 key employment sites (4.4%), 5 employment centers (2.2%), 38 residential centers (16.6%), 20 growth areas (8.7%), 26 industrial cities (11.4%), 35 low-fertile farming and fishing villages (15.3%) and 95 stagnant areas (41.5%). Second, the Seoul metropolitan area is the most diverse type of metropolitan area in the country, with most of its core employment sites inside Seoul, residential centers inside and outside Seoul, and growth areas in the southeastern part of the country (Busan, Ulsan, and Gyeongsangnam-do) are mixed with industrial and growth areas centered around Busan, Ulsan and surrounding areas, while the rest of the local governments are found to be low-fertile farming villages or stagnant areas. Daegu (Daegu, Gyeongbuk) is an industrial city in Daegu, and the rest of the local governments are either low-density farming and fishing villages or stagnant areas. The Honam region (Gwangju and Jeolla) was found to be a low-mill farming and fishing village or stagnant area except for Gwangju, while the Chungcheong region (Daejeon, Sejong, and Chungcheong) was seen as a growth area with areas adjacent to Daejeon, Sejong, and the Seoul metropolitan area, and some industrial cities were included. Finally, the Gangwon area was mostly classified as low-density farming and fishing villages and stagnant areas.

Developing the Estimation Method of the Economic Impacts of 2002 Typhoon Rusa Disruption

김근영,Kim. Geun-Young 한국방재학회 2003 한국방재학회논문집 Vol.3 No.1

본 연구의 목적은 자연재해나 인위재해로 인한 시설물 피해가 초래하는 경제적 영향을 분석할 수 있는 재해영향평가모형을 개발하고, 2002년도에 발생한 태풍 루사를 연구사례로 하여 본 연구에서 개발한 평가모형의 적용가능성을 살펴보는 것이다. 본 연구에서는 태풍 루사로 인한 시설물 피해가 초래하는 경제적 영향을 평가하기 위해서 경제분석모형인 다지역 투입산출모형(MRIO model)을 적용하여 서울시, 인천시, 경기도와 수도원외지역의 수해피해 영향을 분석하였다. 본 연구방법을 적용하여 지역별 산업별 경제피해영향을 분석한 결과 직간접 수해피해는 총 15조 4천 5백 2십 4억원이고, 고용손실영향은 총 265,476인으로 나타났으며 수도권외지역의 비중이 각각 88,8%와 88.1%를 차지하여 지방경제의 피해가 상당한 것으로 나타났다. 또한 복구비를 투자하였을 경우 총 21조 5천 9백 5십 7억원의 경제파급효과와 412,110인의 고용창출효과가 발생하고, 특히 수도권외지역에서 투자파급효과의 89.3%와 고용창출효과의 89.5%를 차지하여 지방경제 활성화에 크게 기여하는 것으로 분석되었다.

Vflo^TM를 이용한 홍수유출수문곡선의 반응해석

김근영,추연문,여운기,지홍기,Kim. Keun Yeong,Choo. Yean Moon,Yeo. Won Ki,Jee. Hong Kee 한국방재학회 2012 한국방재학회논문집 Vol.12 No.3

본 논문에서는 보다 정확한 강우의 특성을 파악하기 위하여 레이더 강우를 적용하여 비선형성을 내포하는 강우-유출관계를 연구고찰하였다. 레이더 추정강우량과 지상의 관측강우량의 비율관계를 이용하여 레이더 추정강우를 보정하는 G/R기법을 적용하여 레이더 추정강우의 정확도를 향상시켰다. 레이더 추정강우로부터 분포형 강우 유출모델의 적용성을 검증하기 위하여 대표적인 분포형 강우-유출모델인 <TEX>$Vflo^{TM}$</TEX>분석체계를 구축하고 격자의 크기를 변화시켜가면서 유출양상을 분석하였다. 이 논문에서는 레이더 강우의 추정 및 보정과 분포형 강우-유출모델의 격자크기(Sell Size)를 제안하였다. This research examined a rainfall-runoff relationship containing linearity by applying radar rainfall to grasp more accurate properties of rainfall. In addition, this research improved accuracy of estimated radar rainfall by applying a G/R(Gauge to Radar) technique compensating estimated radar rainfall through using a ratio relationship between estimated radar rainfall and observed ground rainfall. In order to verify applicability of distributed rainfall-runoff model from radar estimated rainfall, this research constructs a <TEX>$Vflo^{TM}$</TEX> analysis system which is typical distributed rainfall-runoff model and analyzed a discharge aspect while changing the size of a lattice. This research proposed estimation and compensation of radar rainfall as well as the lattice size of distributed rainfall-runoff model.

재해의료와 재해의료시스템

김근영,송철호,원준연,Kim, Geun-Yeong,Song, Cheol-Ho,Won, Jun-Yeon 한국방재학회 2002 한국도시방재학회지 Vol.2 No.3

상온 진공 분말 분사공정에 의해 제조된 TiO₂ 광촉매 막의 두께변화에 따른 광촉매 특성

김근영,류정호,한병동,최종진,윤운하,이병국,박동수,박찬,Kim, Kun-Young,Ryu, Jung-Ho,Hahn, Byung-Dong,Choi, Jong-Jin,Yoon, Woon-Ha,Lee, Byoung-Kuk,Park, Dong-Soo,Park, Chan 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12

$TiO_2$ is an environment-friendly semiconducting material, and it has photocatalytic and hydrophilic effect. There are a lot of reports on the photocatalytic characteristics of $TiO_2$, such as organic pollutants resolving, anti-bacterial, and self-purification material. In this paper, $TiO_2$ micron-sized powders were deposited on the glass by room temperature powder spray in vacuum process, so called aerosol deposition (AD), and nano-grained $TiO_2$ photocatalytic thin films were fabricated. The thickness of the films were controlled by changing the number of deposition cycle. Morphologies and characteristics of the AD-$TiO_2$ thin films were examined by SEM, TEM, XRD, and UV-Visible Spectrophotometer. As the thickness of $TiO_2$ films increased, surface roughness increased. By this increment, the reaction area between film and pollutant was enlarged, resulting in better photocatalytic property.

동무소론(東武所論) 사가체질(四象體質)의 표리한열개요(表裏寒熱槪要)

김근영,Kim, Geun-Yeong 대한한의학회 1995 대한한의학회지 Vol.16 No.2

스펙트럼 영역 빛간섭단층촬영을 이용한 시신경유두 모양에 따른 시신경 유두주위위축 분석

김근영,이유경,문정일,박명희.Geun Yeong Kim. MD. You Kyung Lee. MD. Jung Il Moon. MD. PhD. Myoung Hee Park. MD. PhD 대한안과학회 2013 대한안과학회지 Vol.54 No.11

Purpose: To analyze the structural changes in the β-zone of peripapillary atrophy (PPA-β) using cross-sectional image of the optic disc head from spectral-domain optical coherence tomography (SD-OCT) according to the optic disc shape. Methods: One hundred thirty-seven eyes in 137 patients with glaucoma having PPA-β and 31 normal eyes (control group) were evaluated retrospectively. Cross-sectional images of the optic disc were taken using the Cirrus HD-OCT. We classified optic disc patterns into normal, focal, myopic, generalized enlargement and senile sclerotic appearance types and analyzed the shape of Bruch’s membrane (BM), composition of retinal layer and retinal slope according to the optic disc shape. Results: Among the 137 eyes with glaucoma, 54 eyes were focal disc type, 34 eyes were myopic disc type, 28 eyes were generalized enlargement disc type and 21 eyes were senile sclerotic disc type. The myopic disc group showed a noticeable difference compared to the other groups in terms of a higher percentage of BM defect type, the lowest retinal slope (70.6 ± 12.0°) and the earlier termination of retinal layers. The generalized enlargement disc group showed the highest percentage of curved BM type. Retinal slope angle increased with age and decreased with axial length. Conclusions: In the β-zone of peripapillary atrophy, there were several differences in the shape of Bruch’s membrane, composition of retinal layers and the retinal slope according to the optic disc shape. J Korean Ophthalmol Soc 2013;54(11):1748-1756