[지역보도부문/뉴스_제57회 이달의 방송기자상] 교과서 표지 모델로 일본인을?

황정환 (사)방송기자연합회 2013 방송기자 Vol.13 No.-

Incidence and Risk Factors of Tuberculosis in Patients with Human Immunodeficiency Virus Infection

황정환,최평균,김낙현,방지환,송경호,박완범,김의석,박상원,김홍빈,김남중,오명돈,조강원 대한의학회 2013 Journal of Korean medical science Vol.28 No.3

Korea is a low prevalence country for human immunodeficiency virus (HIV) infection and has an intermediate tuberculosis (TB) burden. We previously reported that the incidence of TB in HIV-infected patients was 9.6 cases per 100 person-years (P-Y) between 1988 and 1997. The aims of the present study were to measure any change in incidence from the previous study, and to identify risk factors for TB in HIV-infected patients. We reviewed all medical records of HIV-infected patients who were followed-up in one tertiary hospital between 1998 and 2010. Over the total observation period of 5858.33 P-Y, TB developed in 70 patients (1.19 cases per 100 P-Y; 95% confidence interval [CI], 0.91-1.47 cases per 100 P-Y). Based on Poisson regression, one risk factor associated with TB was an initial CD4+ cell count below 200 cells/μL (relative risk, 2.34; 95% CI, 1.47-3.73). Mean CD4+cell counts of pulmonary, extrapulmonary, and both pulmonary and extrapulmonary TB were 179.8 cells/μL, 138.3 cells/μL, and 114.2 cells/μL, respectively (P = 0.55). In conclusion, the incidence of TB in HIV-infected patients has decreased since the previous study. An initial CD4+ cell count below 200 cells/μL is an independent risk factor for development of TB in HIV-infected patients.

우리나라 과수 신품종 육성현황과 전망

황정환 한국종자연구회 2005 종자과학과 산업 Vol.1 No.2

Quadrature-detection-error compensation in a sinusoidally modulated optical interferometer using digital signal processing

황정환,박창수 한국광학회 2019 Current Optics and Photonics Vol.3 No.3

In an optical interferometer that uses sinusoidal modulation and quadrature detection, the amplitude and offset of the interference signal vary with time, even without considering system noise. As a result, the circular Lissajous figure becomes elliptical, with wide lines. We propose and experimentally demonstrate a method for compensating quadrature detection error, based on digital signal processing to deal with scaling and fitting. In scaling, fluctuations in the amplitudes of in-phase and quadrature signals are compensated, and the scaled signals are fitted to a Lissajous unit circle. To do so, we scale the average fluctuation, remove the offset, and fit the ellipse to a unit circle. Our measurements of a target moving with uniform velocity show that we reduce quadrature detection error from 5 to 2 nanometers.

울릉군 천부리 해안 소공원 조성계획

황정환 경주대학교 지역개발연구소 2004 地域開發論叢 Vol.- No.6

This study was attempted to establish landscape beauty, artistry, sense of place, local color and pleasantness, to offer rest and culture places for natives and visitors, and to compose settlement environments of pleasant, toward improving livelihood conditions of fishing village for the heightening of Ulleung's image as a whole, the offer of benefit, the upturn planning of sightseeing effect and the creation image of Ulleung's symbol and pleasant at the small-park on the adjacent seashore in the Ulleung-gun Chunbu-li. This plan was composed with the sight analysis, the make up direction of development, the concept of circulation system, the concept of introduction programs, facilities and activities, and the others foundation plan. This plan be expected several kinds effect, the first is improving the image of Ulleung through with promotion environment quality on Ulleung's circular road, the second is offering standard to similar development on the other sites, the others are the effects of regional environmental improvement, the balanced development of tourist attractions, the creation of regional culture and the effects of tourist dispersion in Ulleung-gun.

축사

황정환 한국약용작물학회 2018 한국약용작물학회 학술대회논문집 Vol.2018 No.2

장애물을 제외한 가장 큰 공간을 찾는 기법

황정환,전흥석,Hwang, Jung-Hwan,Jeon, Heung-Seok 한국정보처리학회 2011 정보처리학회논문지 A Vol.18 No.2

최근 청소로봇을 위한 여러 가지 알고리즘들이 개발되면서 다양한 청소로봇들이 개발되고 있다. 그 중 청소로봇이 청소하는데 있어 청소시간의 제약이 있을 경우 효율적으로 청소할 수 있는 알고리즘인 DmaxCoverage 알고리즘이 있는데 이 알고리즘을 구현하는데 장애물이 존재하지 않는 비어있는 공간을 찾기 위해 Rectangle Tiling기법을 사용하고 있다. Map을 그리드 형태의 수많은 사각형으로 나타낼 경우 사각형을 찾는 기법 중 수학적 방법으로 Rectangle Tiling이 최적의 값을 찾아줄 수 있다. Rectangle Tiling 기법은 그리드 형식의 map에서 생성될 수 있는 사각형들의 모든 경우의 수를 찾는 것이다. 이때 그리드선의 간격이 촘촘하고 map의 크기가 클 경우 많은 사각형이 생성됨으로 많은 시간을 소모해야 하는 문제점이 있다. 본 논문에서는 Rectangle Tiling에 근접한 정확성과 보다 개선된 속도를 제공하는 Four Direction Rectangle Scanning(FDRS)기법을 제안한다. FDRS기법은 존재하는 모든 사각형을 찾는 것이 아니라 물체가 존재하는 셀의 상하좌우만을 검색하여 빈 공간을 찾는 기법이다. 이 두 알고리즘을 비교하여 FDRS의 효율이 뛰어남을 실험을 통해 보여준다. Recently, many cleaning robots have been made with various algorithms for efficient cleaning. One of them is a DmaxCoverage algorithm which efficiently clean for the situation when the robot has a time limit. This algorithm uses Rectangle Tiling method for finding the biggest rectangle that doesn't have any obstacle. When the robot uses grid map, Rectangle Tiling method can find the optimal value. Rectangle Tiling method is to find all of the rectangles in the grid map. But when the grid map is big, it has a problem that spends a lot of times because of the large numbers of rectangles. In this paper, we propose Four Direction Rectangle Scanning(FDRS) method that has similar accuracy but faster than Rectangle Tiling method. FDRS method is not to find all of the rectangle, but to search the obstacle's all directions. We will show the FDRS method's performance by comparing of FDRS and Rectangle Tiling methods.

21세기 皇城市民公園 造成方案

황정환 경주대학교 지역개발연구소 1998 地域開發論叢 Vol.- No.1

The purpose of this study is to present a new direction fer the construction of the Hwangsung Park in the ancient city Kyongju for the 21st century. And the results of this study are as follow: 1. According to the world-wide trend, the urban development for the 21st century should be based upon the development plan for the sustainable cities or eco-cities. 2. The preservation and restoration plan for the marred traditional fordwt in this park should be made in consideration of nature. 3. The future Hwangsung Park should be constructed in consideration of nature, our culture and history, and ecology, and should be accessible and friendly to the citizens. 4. This park will be located in the heart of this ancient city and will continue to play most important role even in the 21st century. 5. The quantity of oxygen emitted from the forest of the park amounts to about 480 tons, conducive to about 1,730 citizens a year. 6. For the successful construction of the park, civilian participation, reappraisal and revaluation of the existing plan for the construction of the park, introduction of the non-government development system, a study of the internal-external space fuction in the park, and ecological consideration will be required. 7. 10 fundamentals for the gymnasium construction in gthe compound of the park are suggested with both microscopical and macroscopical care. And the modification fundamentals from the viewpoint of history-culture and environment are analyzed.

올림픽 公園의 意味 分析

黃正煥 경주대학교 1993 論文集 Vol.4 No.-

We perceive landscape and formulate the image of the landscape through a series of cognition process. In the relationship between object and observe, and object elicits information about it's uniqueness as well as it's relationship to other objects. An observe gives meaning to the object that he or she perceives by way of choosing and composing certain object according to the current purpose within the limitation of his or her environmental adaptability. This study tries to have meaning through content interpretation suggesting in terms that image of each piece of landscape is cognized to a certain meaning. The Olympic Park contructed in national level in size and facility as well as historically known is selected as the study site. The main body discusses development potentiality, invited function, and site planning. The followings are the results for analysis and synthesis through content interpretation for 6 areas planning. * Composition Composition of the Olympic Park shows the landscape of transposition, distortion and chaos, like surrealistic painting. Floors such as large lawn ground, large pavement area and water surface of pond intend to embrace everything and to play the role of contrast and moving earth surface. The orthogonal patterns are skewed and begin to writhe under the comparatively weightless objects. Pond water surface comes in green space and water edge plaza. On the contrary, water edge plaza naturally intrudes into water by skewing of the perpendicular elements crossing at right angles. The function of pond surface and green area operates more strongly and actively by the treatment of gentleslope. * Form Form of the Olympic Park appears in a variety of configuration whether it has natural meaning or not. This is physical form shaped by contrast effect of natural curve line and man-made straight line, as well as areal and linear element. Those are the areal form of earth fort curve line, edge line of plaza and green space, edge line of these forms exist in our imagination. This can be specified through the term "image" * image Recently the range of image expression is expanding. Landscape value about what we cannot understand are being recognized as a new dimension. "Here" and "There" represent relatively different images in large environmental sculpture, small environmental sculpture in large plaza, and a group of buildings at the end of large green area in the Olympic Park. Here and there relate to individuality or sympathy in terms of place aspect. This and that relate to color, texture, scale, style, character and personality in terms of content aspect. Areas of presentation are being expanded in introduction of traditional culture aspects. In particular, fork performance area of traditional "Madang" concept is shaped for showing signs of incipient life and gives Yin concept, and we feel the power receiving and controlling everything as symbolic center of the park. The power sweeps the center space along landform of earth fort which is Yin, and water, Tan, operates in the shape that embraces the outer wall. As mentioned above, landscape architects present three basic goals in common ; to make landscape architecture as art ; to make visually strong works ; and to make meaningful works. Therefore, the holistic meaning of the Olympic Park through the analysis of composition, form a d image is presented as "large revolution" pr "wonderment". It is possible to promote large revolution of design by way of violating the culturally permissible boundary of form and composition choice. Within this context, the Olympic Park is a "new creation".

경주 황성공원의 식물군집 구조 분석

황정환,강기호 경주대학교 건설환경연구소 1999 建設環境論叢 Vol.- No.2

To investigate the plant vegetation structure of the Hwangsung park(a traditional forest of about 257 acres) in the center of Kyongju city, eighteen plots were set up and surveyed. As a result, Quercus spp. were much distributed and dominated in this research. In recent, increasing of park users and public buildings are disturbed the growth and the generation of plant. Shannon's diversity was 0.54 in surveyed area. It was lower value not to be compared with the natural vegetation. Moreover, it was 0.8∼0.9(similar value to natural vegetation) in the area that the lower layer of vegetations are well preserved. Finally, index of Similarity was very lower value because of artificial forest.