• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1827-1828
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• 2007

임베디드 시스템은 주로 처리된 정보를 관리하는 서버를 가지고 있다. 임베디드 시스템 대부분이 많은 양의 데이터를 적재 할 수 없기 때문에 별도로 처리된 정보들을 관리하는 서버가 필요하다. 이런 서버와 임베디드 시스템을 직접 연결하거나 요즘에는 USN을 이용하여 연결하기도 한다. 이런 임베디드 시스템에 다수의 사용자가 접근하여 제어가 가능하도록 하기 위해서 임베디드 미니 웹서버의 역할이 매우 중요하다. 임베디드 미니 웹서의 사용자 접근에는 여러 방법이 있다. 일반적인 웹서버 방법 중에 하나인 ID와 비밀번호를 이용한 로그인 방법이나 IP주소를 구분하는 방법 등이 있다. 하지만 이런 방법들은 완벽한 사용자의 고유성을 보장 할 수 없다. ID와 비밀번호를 도용할 수 있으며, IP주소를 구분하는 것도 아주 한정적인 사용자 관리에 불과하다. 이런 단점을 좀 더 보완하고자 접근 사용자가 RFID리더를 가지고 자신만의 RFID Tag를 읽힘으로써 사용자의 고유성을 높일 수 있다. RFID를 이용한 임베디드 미니 웹서버를 접근하는 시스템을 설계한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.4
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• pp.1-11
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• 2016

The purpose of this study is to analyze the effect of public transit accessibility on the Carsharing use demand. By utilizing the rental historical DB of Greencar which is operated in Suwon city and public transit GIS DB, the use demand models for Carsharing by rental offices are built and analyzed in accordance with public transit accessibility. The result indicates 73% of walking as a majority, 3% cycling, and 20% using buses and urban railways to access Carsharing rental offices. The goodness of fit of Carsharing use models reflecting accessibility to buses and railways is verified as 0.818 which proves that public transit accessibility is a significant variable. Therefore, it is verified that installing Carsharing rental offices where public transit transfer is convenient can possibly increase the use demand. Especially, while accessibility to buses is verified as a significant variable out of other public transit means, the accessibility to urban railways is verified as not significant. This suggests that a variety of complementary policies such as transfer discount policy and one-way transfer return policy are necessary in between urban railways and Carsharing in order to promote mutual use demand in accordance with the other public transit means. This study result is yet the basic research on Carsharing, however it is expected to contribute to improvement of transfer demand in between different public transit means.

• Journal of Korea Spatial Information System Society
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• v.9 no.3
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• pp.25-33
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• 2007

The local governments of major cities in Korea are giving focus on public transportation to reduce congestion and improve accessibility in city areas. In this regards, the proper measurement of accessibility is now a key policy requirement for reorganizing the public transport network. Public transport routing problems, however, are considered to be highly complicated since a multi-mode travel generates different combinations of accessibility. While most of the previous research efforts on measuring transport accessibility are found at zone-levels, an alternative approach at a finer scale such as bus links and stops is presented in this study. We proposes a method to compute the optimal route choice of origin-destination pairs and measure the accessibility of the chosen modes combination based on topological configuration. The genetic algorithm is used for the computation of the journey paths, whereas the space syntax theory is used for the accessibility. This study used node-link data in GIS instead of axial lines which are manually drawn in space syntax. The resulting accessibilities of bus stops are calibrated by O-D survey data and the proposed process is tested on a CBD of Seoul.

• Journal of the Korea Society for Simulation
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• v.27 no.4
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• pp.9-18
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• 2018

This paper proposes new algorithms of accessibility indices to analyze the connectivity of the Korean highway network. First of all, we find a transportation network that presents Korea's highway network in graphs in 2011 and 2017. And we analyze and compare the nation's highway network in 2011 and 2017 using concepts such as associated number, the relative distance, the accessibility, the degree of connectivity, the index of dispersion, the diameter of graph theory. To do this, an algorithm is presented which can easily obtain various accessibility indices from a given transportation network. Using the simulation results of this study, we can find city that is the center of traffic in the highway transportation network. In addition, cities that are included in the network but are relatively underdeveloped can be found and used as basic data for enhancing the connectivity of the nationwide traffic in the future. Moreover, the proposed algorithms of accessibility indices, which are modeled on highway transport networks, can help identify the accessibility space structure of each city and provide criteria for efficient and reasonable selection of alternatives in various regional planning processes, including transportation.

• Journal of the Korean Geographical Society
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• v.40 no.5 s.110
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• pp.514-532
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• 2005

The purpose of this study is to critically examine conventional spatial measures of individual accessibility, which are based on the notion of spatial proximity, the single reference location, and the unlinked travel model. Using space-time accessibility measures with the travel-activity diary data set of Portland Metro, US, three expectations from spatial measures on spatial patterns of individual accessibility were empirically examined: (1) does individual accessibility decrease with an increase of distance from the CBD?; (2) does the spatial pattern of accessibility resemble that of urban opportunity density pattern?; and (3) are spatial patterns of individual accessibility of different socio- demographic population groups basically similar as people in the same area share the same geographic characteristics regardless of gender, race, age, and so on? First of all, the results showed that spatial variations in individual accessibility were not directly determined by spatial proximity and opportunity density as suggested by previous accessibility measures. The spatial pattern of individual accessibility was dramatically different from that of urban opportunity density High peaks of accessibility level were found far away from the CBD and regional centers. This finding might be associated with the importance of multi-reference locations and linked travels in shaping accessibility in reality. Furthermore, this study found that spatial patterns of accessibility clearly differ between men and women. These findings suggest that access requires more than proximity, and that the interaction between person-specific space-time constraints and the consequential availability of urban opportunities in space-time renders different accessibility experiences to people even in the same region, which would be one of the key ingredients missing from conventional spatial measures of accessibility.

• Information and Communications Magazine
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• v.31 no.12
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• pp.89-96
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• 2014

본고에서는 사용자의 콘텐츠 이용 방법 및 선호 요소를 능동적으로 수용하고 반영하는 접근성 메타데이터 서술 및 그들의 정합을 실현하는 접근성 플랫폼 구성 개요와 모형을 제시하고 그것의 개발과 서비스에 적용될 표준화 가능 항목과 범위를 제안한다. 본 제안은 사용자 개인화 및 접근성이 제공되는 전자책, 사이버 가정학습, 디지털 교과서의 표준에 따른 제작에 기여할 것으로 생각한다.

• Journal of Korea Society of Industrial Information Systems
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• v.11 no.1
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• pp.38-48
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• 2006

Several software programs such as Bobby and A-Prompt developed based on the W3C's WCAG 1.0 guidelines have been employed to evaluate the accessibility of web sites. Although these programs make an evaluation of web accessibility easy and objective, many researchers pointed out that the results of web accessibility are lack of reliability. Therefore, this study is intended to suggest the modified algorithms for evaluating web accessibility focused on the 'images' and 'tables'. To verify them, we compared the accessibility of the Korean governmental web sites with new and current algorithms, respectively. The results show that the suggested algorithms are more accurate than the existent one.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.1
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• pp.149-156
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• 2015

In this paper, the web accessibility of institutions and organizations that are related to disaster response we evaluate analysis. Along with the legal enforcement of Web accessibility, It is because shall comply with web accessibility. we have applied the K-WAH4.4 as an evaluation tool for web accessibility compliance of actual conditions. Look at the degree of compliance with the six detailed procedure of the web site, we request to the improvement of Web accessibility. Based on the guidelines 2.0, looked to the insufficient compliance rate at 61.8%. Then, we propose the need for improvement to enhance Web accessibility.

• Journal of Cadastre & Land InformatiX
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• v.47 no.1
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• pp.127-142
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• 2017

The purpose of this study is to examine the status of urbanization of Namyangju-Si from 2001 till 2008, analyze the correlation of the change of surrounding land use according to the change of accessibility and analyze the correlation of the change of land use. Based on the result from correlation analysis, I simulated from the view point of interactions between agents of land use and transportation accessibility by using MAS. I tried to forecast, based on space, the change of surrounding land use caused by the change of accessibility. I conducted landscape analysis by using a land registration map. Also, I conducted GIS analysis statistical analysis simulation analysis of traffic data, land use data in order to analyze the correlation of the change of surrounding land use according to the change of accessibility. I could find out a certain pattern that new roads and railroads causes the within 500m adjacent land to change into urban land use, which led me to construct a system through which land use changing phenomenon can be expected according to the change of accessibility. It is expected that it can make the best use of selecting the location where new transportation facilities are constructed.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.39-41
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• 2011

웹 접근성이란 '어떠한 사용자(장애인, 노인 등)'가 어떠한 기술 환경에서도 사용자가 전문적인 능력 없이 웹 사이트에서 제공하는 모든 정보에 접근할 수 있도록 보장하는 것이다. 그러나 홈페이지 구축 비용 등의 문제로 장애인 관련 단체나 학교 등 가장 필요한 사이트 조차 접근성을 준수하고 있지 못하다. 따라서, 저비용으로 쉽게 웹 접근성 준수 학교 홈페이지를 구축할 수 있는 ASP(Application Service Provider) 서비스 모델을 제안한다. 제안된 서비스는 HTML/XHTML 표준에 맞게 올바른 마크업 언어를 사용하고, CSS를 통해 구조와 표현을 완전 분리하여 개발하여 웹 접근성의 기본이 되는 웹 표준을 준수하였으며, 표준 지원 브라우저들과 모바일 웹 환경의 종류와 특성을 이해하고 이를 바탕으로 브라우저 간 상호 운용성을 보장하기 위해 자바 스크립트를 표준 문법과 구조에 맞게 사용하고, W3C의 표준 DOM을 이용하여 홈페이지에 필요한 기능들을 설계하였다.