• 환경영향평가
• /
• 제15권3호
• /
• pp.179-191
• /
• 2006

The authors argue that the current Government Information System for asthmatics appears to be non-user friendly due to lack of the cartographic representation for the text based statistical data. Acknowledging these constraints, an operational, user-friendly map for asthmatic prevalence has been generated by combining existing statistical data with the administrative Dong boundary map under GIS environment. The Geographical User Interface, in particular, were ideally suited to deriving the major distribution patterns that more asthmatic prevalence tends to be occurred on conventional commercial district and industrial complex. A visual map using spatial modelling technology were generated to show the fact that some degree of increasing or decreasing trends of asthmatic prevalence already exists in the experimental sites. It could be used as an evidence to restrict initiation of development activities causing negative influence to asthma such as road construction. The result of this study would play a crucial role in improving the quality of environmental health information service if it is operationally introduced into the Government since the highly user-friendly interface provides a completely new means for disseminating information for asthmatics in a visual and interactive manner to the general public.

• 한국자동차공학회논문집
• /
• 제20권3호
• /
• pp.141-147
• /
• 2012

A direct injection diesel engine with large amount of exhaust gas recirculation was used to investigate low temperature diesel combustion. Pilot injection strategy was adopted in low temperature diesel combustion to reduce high carbon monoxide and hydrocarbon emissions. Combustion characteristics and exhaust emissions of low temperature diesel combustion under different pilot injection timings, pilot injection quantities and injection pressures were analyzed. Retarding pilot injection timing, increasing pilot injection quantity and higher injection pressure advanced main combustion timing and increased peak heat release rate of main combustion. As a result of these strategies, carbon monoxide and hydrocarbon emissions were reduced. Soot emission was slightly increased with retarded pilot injection timing while the effect of pilot injection on nitrogen oxides emission was negligible under low combustion temperature condition. Spatial distribution of fuel from the spray targeting visualization was also investigated to provide more insight into the reason for the reduction in carbon monoxide and hydrocarbon emissions.

• International Journal of Automotive Technology
• /
• 제2권4호
• /
• pp.165-170
• /
• 2001

This study is focussed on the investigation of spray characteristics from the high pressure gasoline injector for the application of gasoline direct injection engine. For the analysis of spray structure of high pressure gasoline injector; the laser scattering method with a Nd-Yag laser and the Phase Doppler particle analyzer system were applied to observe the spray development and the measurement of the droplet size and velocity of the spray, respectively. Also spatial velocity distribution of the spray droplet was measured by use of the particle image velocity system. Experimental results show that high pressure gasoline injector shapes the hollow-cone spray, and produce the upward ring shaped vortex on the spray surface region. This upward ring shaped vortex promotes the secondary atomization of fuel droplets and contributes to a uniform distribution of fuel droplets. Most of fuel droplets are distributed under 31$\mu m$ of the mean droplet size (SMD) and the frequency distribution of the droplet size under 25$\mu m$ is over 95% at 7 MPa of injection pressure. According to the experimental results of PIV system, the flow patterns of the droplets velocity distribution in spray region are in good agreement with the spray macroscopic behaviors obtained from the visualization investigation.

• 한국실내디자인학회논문집
• /
• 제16권2호
• /
• pp.155-162
• /
• 2007

The purpose of this comparative study is to analyze the characteristics of art museums of Louis I. Kahn. Kahn's main architectural thoughts of 'what it wants to be' and 'how it was done' act as a basis for this research. 'What it wants to be' means the existence of architecture and relates to the concept of 'room'. 'How it was done' shows the tectonic aspects of architecture and construction process to enhance its presence. Detailed items from these two thoughts applied to clarify the order in dynamics, the visualization of construction process, and the relationship between structure and light in the space of Kahn's art museums. Yale university art gallery was the first major project of Kahn and he showed tectonic characters through tetrahedral concrete slab. The unity of structure, space and light can be found in the Kimbell art museum through the vaulted structural unit. Yale center for British art is the best example of the concept of 'room' and 'tectonic' because it clearly shows the unity of spatial and structural system, and their relation to light. As a result, this study tries to find out that Kahn had consistently developed his thoughts of'room' and 'tectonic', and tried to keep them in his art museum designs.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
• /
• 제16권5호
• /
• pp.616-620
• /
• 2010

일반적으로 대부분의 사람들은 많은 수의 디지털 사진을 관리하기 위해서, 이벤트 혹은 날짜에 따라 각 사진들을 폴더별로 분류하는 방법을 사용한다. 그러나 관리해야할 사진의 개수가 수백에서 수천 장으로 증가함에 따라, 사진 관리에 많은 시간과 비용이 소모된다. 본 논문에서는 촬영 시각과 사진의 색상 차이를 이용하여, 유사한 사진들을 서로 가깝게 배치하는 2D 격자 공간 기반의 사진 관리 시스템을 제안한다. 그리고 2차원 격자 공간에 배치된 각 사진들을 계층적으로 클러스터링 함으로써, 사용자가 원하는 수준의 세부 단계별 분류 기능을 지원한다. 제안한 시스템의 성능을 평가하기 위해서, 배치된 사진들에 대한 시간 일관성과 사용 공간 효율성을 측정하였다.

• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1997년도 춘계학술대회
• /
• pp.72-74
• /
• 1997

We have developed a 3-D image processing and display technique that include image resampling, modification of MIP, and fusion of MIP image and volumetric rendered image. This technique facilitates the visualization of the three-dimensional spatial relationship between vasculature and surrounding organs by overlapping the MIP image on the volumetric rendered image of the organ. We applied this technique to a MR brain image data to produce an MRI angiogram that is overlapped with 3-D volume rendered image of brain. MIP technique was used to visualize the vasculature of brain, and volume rendering was used to visualize the other structures of brain. The two images are fused after adjustment of contrast and brightness levels of each image in such a way that both the vasculature and brain structure are well visualized either by selecting the maximum value of each image or by assigning different color table to each image. The resultant image with this technique visualizes both the brain structure and vasculature simultaneously, allowing the physicians to inspect their relationship more easily. The presented technique will be useful for surgical planning for neurosurgery.

• 한국HCI학회:학술대회논문집
• /
• 한국HCI학회 2008년도 학술대회 2부
• /
• pp.227-232
• /
• 2008

Since 2000, there have been many changes in the residential types, such as an intelligent apartment which integrates both resting space and production space with comfort able, pleasant and safe environments based on internet systems. As the result of the rapid decrease in the birth rate and the prolonged lifespan around the world, it is expected that we will enter into an aging society by 2026. With such the expected change in the living patterns, many issues concerning the increased number of the elderly people have emerged as major social problems such as changes of family formation, its function and values, responsibility of caring for the aged, health and medical care, habitation policies and so on, and it is required to reconsider the social awareness on the living qualities of each old person. However, we have not yet satisfied such requirements with appropriate policies for the improvement of the living environment for them. It is considered, therefore, that we need to develop a new tool that, according to our goals, can give us a broad understanding on several considerations in designing the future homes for the elder people, making it possible to check the process changed by residents' needs in real time and apply it immediately to the space. As we have seen, it is required that spatial design process and design methodology should be considered in designing the homes for the aged for the pre-occupancy design evaluation.

• 한국가시화정보학회:학술대회논문집
• /
• 한국가시화정보학회 2007년도 추계학술대회
• /
• pp.105-108
• /
• 2007

To diagnose the vascular diseases from the viewpoint of hemodynamics, we need detailed quantitative hemodynamic information of related blood flows with a high spatial resolution of tens micrometer and a high temporal resolution in the order of millisecond. For investigating in-vivo hemodynamic phenomena of vascular circulatory diseases, a new diagnosing technique combining a medical radiography and PIV method was newly developed. This technique called 'Angiographic PIV system' consists of a medical X-ray tube, an X-ray CCD camera, a shutter module for generating double pulse-type X-ray, and a synchronizer. Through several preliminary tests, the feasibility of the Angiographic PIV technique was verified. For in-vivo applications to real blood flows, we developed tracer microcapsules, which were optimized to this system, made of a contrast material of iodine and a matrix material of PVA (polyvinylpyrrolidone). In near future, the Angiographic PIV technique will be used for understanding hemodynamic phenomena of vascular diseases and for their early detection.

• 지구물리와물리탐사
• /
• 제4권4호
• /
• pp.101-109
• /
• 2001

다양한 지하 정보를 효율적으로 관리하고 사용자가 필요로 하는 형태의 정보를 쉽게 가공할 수 있는 공간 정보 시스템을 구축하기 위하여 시추 정보를 데이타베이스화 하였고 시추공, 광체, 터널, 채굴 공동 등의 지하 개체를 3차원으로 시각화하였다. 또한 여기서 만들어진 3차원 광체에 이용할 수 있는 분석 도구, 즉 수직 단면 생성 도구, 매장량 계산 도구 등을 제작하였다. 이 정보 시스템은 상응 GIS 소프트웨어인 ArcView의 스크립트 언어인 Avenue를 사용하여 개발하였으며, 사용자들이 실시간 질의와 개체의 다양한 조합 및 3차원 조망을 통해 지하 구조에 대한 정확한 분석 및 해석을 쉽게 그리고 신속히 할 수 있도록 하였다.

• 전기전자학회논문지
• /
• 제7권1호
• /
• pp.119-126
• /
• 2003

CT 영상을 이용하여 인공 무릎관절 모의 치환 시술 환경 구축에 관한 방법을 제시한다. 관절의 3차원 형상의 재구성에 필요한 정보는 영상처리 기법을 이용하여 연속된 CT 영상으로부터 노이즈 제거와 포인트 데이터를 추출하며, 추출된 포인트 데이터는 영상의 해상도와 함께 생역학에서 제시한 역학적 축을 기준으로 실측의 3차원 형상으로 재구성된다. 재구성된 형상은 PC 기반에서 구현된 모의시술 프로그램을 통하여 관절 운동의 해석과 접촉면 해석을 지원하며, 조이스틱과 마우스등을 이용하여 인공관절의 치환과 절단을 가상으로 실행할 수 있도록 하였다. 또한 인공 관절의 접합부에 대한 접촉면 해석을 통하여 시술에 대한 정합성과 연골 부위의 마모성 예측을 시각화하였다.