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주거환경개션지구 立地와 空間特性에 관한 연구 : 6個地區 中心으로 Focused on the six sections
안영복 영남이공대학 2001 論文集 Vol.30 No.-
This study analyzed the humane elements and the physical environments for the location and the space character of the residential area for the environmental improvements. The population characters of the objective area were grasped for the humane elements and the physical environments (the size of site, the condition of house occupancy, the actual condition of building, building area building's age) were analyzed. The result of analysis, the level of the residential environment in the residential area for the environmental improvement was lower than that of the residential area It was known that the needs of the inferior housing area development. is smite.
2차 샘플링을 이용한 초음파 도플러 시스템에서 샘플링 주파수 펄스 대역폭이 평균 주파수 측정에 미치는 영향
안영복,박송배,Ahn, Young-Bok,Park, Song-Bai 한국음향학회 1990 韓國音響學會誌 Vol.9 No.3
2차 샘플링이 도플러 신호의 평균 주파수 측정에 미치는 영향에 대해서 분석을 하였다. 아나로그/디지탈 변환기(analogue-to-digital converter)의 샘플링 주파수를 낮추기 위해 수신 신호를 $4f_0$ 대신에 $4f_0$/5나 $4f_0$/9의 낮은 주파수로 샘플링에서 도플러 신호를 얻을 수 있다. ($f_0$는 송신 신호의 중심 주파수이다.) 일반적인 도플러 시스템에서처럼 수신 신호가 협 대역이면 낮은 샘플링 주파수로 인해 발생되는 평균 주파수의 측정에 대한 오차는 무시할 정도로 작다는 것을 컴퓨터 시뮬레이션과 실험을 통해 증명하였다. We analyze the effect of second-order sampling on estimating the mean frequency of the Doppler signal. In order to reduce the sampling frequency of analogue-to-digital converter, it is possible to obtain the Doppler signal by sampling the radio frequency echo signal with the low frequence of $4f_0$/5 or $4f_0$/9 instead of $4f_0$, where $f_0$ is the center frequency of the transmitted signal. The computer simulation and experiments show that if the narrowband signal is transmitted as is usual in the Doppler system, the error of the mean frequency estimates due to the low sampling frequency is negligible.
초음파 영상 시스템에서 합성 집속을 위한 새로운 구면파 발생 방법
안영복 대한의용생체공학회 2007 의공학회지 Vol.28 No.6
The synthetic focusing in the ultrasonic imaging systems has been formed in the way that one element transmits a circular wave and receives an echo signal. The amplitude of the signal transmitted from one element is too small to propagate a long distance so that the SNR(Signal to Noise Ratio) is very low in an image obtained by the synthetic focusing. To solve this problem, a defocusing method which uses several elements has been proposed. In this method, the SNRis improved due to using several elements to transmit the circular wave. But if the number of transmitting elements increases, the phase distortion is severe in the defocusing method. In this paper, we propose a new method that can generate a circular wave using a lot of elements without phase distortion. At first, we generate limited plane waves with different propagation angles and then superpose them to make a circular wave. We show that the circular wave can be used to improve SNR in the real-time 3D ultrasonic imaging as well as the synthetic focusing through computer simulation and experiments.
都市成長에 따른 住居地 變遷過程에 關한 硏究 : 대구시를 중심으로 In case TaeGu city
안영복 영남이공대학 산업기술연구소 2001 産業技術硏究 Vol.13 No.-
The living action for the persons is one of important municipal functions. The residential district is an important factor in space structure of city. Citizen habitatation, itself is central problem of study for city and area. In this artide, I would like to analyze the change of the system in the pubric policy for transition course and devolpment of residential district by the growth of the city. This paper is intented as an investigation of the formation and distribution of residential district. Since 1960 the town planning and zoning act was enacted and housing demand has increased by rapid urbanization, the conversion of farmland for residential district security in the development course of residential district played its important role. We could know that the aspect of residential area formation show great difference according to the pubric policy.
주거환경개선지구 개량주택 평면유형에 관한 연구 : 대구시를 중심으로 In case DaeGu city
안영복 영남이공대학 2004 論文集 Vol.33 No.-
The purpose of research is to find out problems in scale of development and plane shapes of reformed housing in residence environment improvement area. Also this research will show way to improvement. The data were collected by 116 buildings which are with in 8 developing area. Plot plan and floor plan which can analyze site condition, scale of house, plane shape and density of building was used for research contents. Those are physical factor of residence environment elements. In residence environment improvement area, most of land is small, land shape is narrow and long square, nonstandard polygon, triangle. Which are irregular. Also sideways is narrow and complicated. Average site size is 111.25m², 61~90m² (24.14%) is the biggest group if sort by site size. However, it's too small for plan to build. Average size of total reformed housing is 83.75m', the largest building, which has 31.40m², 15.47m² of site space and two story building. The average floor of reformed housing is 2.8 story, 3 story is 46.55%, and 4 story is 15.52% that is 62.07% in total. In research, 46.56% of developed housing has over 201% floor plan ratio. Which is high density. It grow worse of traffic, parking, sunlight, and airing As result of analysis for plan form, plane type cannot be classified by building plan viewpoint. Most of reformed housing's plane form was planned as land shape. It can classify into 6 groups. Square pentagon triangle and irregular square and so on. Currently using reform method contains worse residence environment problem as beginning. Due to ease up the "data analysis result" related law. In order to develope superior quality of reform housing in residence environment improvement area, the law has to be strengthen and establish standard of building plan in developing area has to be enforce.
적응성 가중 메디안 필터와 새로운 잡음 모델을 이용한 초음파 영상의 스펙클 잡음 제거
안영복 건국대학교 1995 學術誌 Vol.39 No.2
A technical method of noise modeling and adaptive filtering for reducing of speckle noise in medical ultrasonic Images is presented. By adjusting the characteristics of the filer according to local statistics around each pixel of the image as moving windowing, it is possible to suppress noise sufficiently while preserve edge and other significant information required in diagnosis. Homogeneous factor(HF) from the noise models that enables the filter to recognize the local structures of the image is introduced, and an algorithm for determining the HF fitted to the diagnostic systems with various inner statistical properties is proposed. The result of proposed method is superior to that of other filters and models in preserving small details and suppressing the noise at homogeneous region.