情報技術의 發達과 都市에의 影響

任昌虎(Yim Chang-Ho) 대한국토·도시계획학회 1998 國土計劃 Vol.33 No.6

The tide of informatization has been moving fast. Nevertheless, our understanding of the informatization process and its impact on cities remains very much fragmented. The purpose of this study is to provide a starting point for the advanced discussion about informatization trend as well as its urban impact. To begin with, this paper critically reviews a broad range of relevant study results, which include investigating the meaning of informatization in historical context and probing the complex relationship between informatization and cities. And, for an in-depth discourse. the study tackles three major issues : first, a comparative review of the perspectives from which the nature and impacts of informatization are to be observed; second, the probable changes in both urban form and function through informatization process ; and third. emerging implications for planning and policy formulation. The paper stresses historical significance of the informatization phenomena facilitated through synergistic advancement of computer and telecommunications technologies In particular. a new term. coined in this study as ‘virtual urbanization’, is introduced to stand for a whole range of human interactions occurring in the domain of ‘electronic space’. Finally. based on the policy experiences of telecommunications in some advanced countries. the paper proposes some frameworks such as efficiency. equity, conviviality. and sustainability so as to serve as reference criteria for both evaluation and formulation of spatial policies and programmes.

공장이전적지의 토지이용특성 규명에 관한 연구

임창호(Yim Chang-Ho),장영일(Jang Young-Il) 대한국토·도시계획학회 1998 國土計劃 Vol.33 No.1

This study aims at : first, reviewing real conditions of the relocating manufacturing sites within the Seoul Metropolitan Area through investigation of administrative statistics as well as field survey data ; second, identifying land use characteristics of those sites ; and third, suggesting some guidelines for the management policies of industrial districts within metropolitan areas. The study classifies the relocating manufacturing sites according to both the site size and the industrial floor area ratio, and proves that the classified clusters are suited for the criteria, which are applicable to management policy of the reocating manufacturing sites. Major findings are as follows. First, the relocating manufacturing sites occupy about 29 percent of the entire manufacturing districts within the Seoul Metropolitan Area, and most of industrial areas have been redeveloped for apartment and multi-family housings. Second, it is revealed that appearance probability of residential use is closely related to area size and land price of relocating sites. And third, types of the development dictate the rise of urban land price. For instance, in the case of the redevelopment for residential use, the increase in land price is higher by 11 percent point than that for industrial use. In addition, the paper proposes several recommendations to redirect management policy of relocating manufacturing sites within metropolitan areas.

On the Measurement of Spatial Population Concentration

任昌虎(Chang-Ho Yim) 대한국토·도시계획학회 1986 國土計劃 Vol.21 No.3

서울시 도심상업활동의 지역ㆍ업종별 입지특성에 관한 비교연구

임창호(Yim Chang-Ho),이소영(Lee So-Young) 대한국토·도시계획학회 1997 國土計劃 Vol.32 No.3

The purpose of this paper is to set a micro - level land use model so as to analyze the characteristics of commercial location behavior in CBDs of Seoul. A commercial version of general location model is derived from traditional location choice model, which is translated to a multinomial legit form and estimated using a land use inventory data of CBDs in Seoul. This study clearly shows two facts about the commercial land use patterns in CBDs of Seoul. First. the commercial land use pattern in a new CBD(Kang - Nam District) of Seoul is different from that in the old CBD(Kang - Buk District). For example. offices in the new CBD tend to agglomerate densely but tend to be separated from other functional clusters. while those in old CBD display the opposite patterns. Second. there is a clear evidence of 3 - dimensional functional differentiation between uses in a commercial district. The findings of the study suggest that land use planning and regulations. to better serve their own goals and objectives. should reflect such micro - level characteristics of commercial location patterns that are place - and industry - specific in nature.

서울 주변지역의 이주 특성 분석

임창호(Yim Chang-Ho),이창무(Lee Chang-Moo),손정락(Sohn Jeong-Rak) 대한국토·도시계획학회 2002 國土計劃 Vol.37 No.4

After undergoing concentration in the 1960s, and polarization reversal in the late 1970s, population of Seoul started to be dispersed into the suburban areas. Outward migrations were accelerated by the construction of five new towns in the early 1990s and the subsequent large and small scale housing developments in the Seoul Metropolitan Area(SMA). The majority of migrants, however, still keep their jobs in Seoul, changing the relationship between Seoul and the surrounding localities. Also, consecutive unplanned housing constructions in the SMA brought out such chronic problems as traffic congestion and deterioration of residential environment. In this context, this study analyzes recent migration patterns in the SMA and seeks future housing policy implications. The study consists of : first, a literature survey of the past migration patterns in the SMA with a brief description of study areas, representing different ways of housing development ; and second, an in-depth analysis of who are the movers, why they moved, and how they moved in the SMA. In addition, it also tries to catch a glimpse of the future migration pattern in the SMA through analyzing the hopes of would-be migrants.

공간적 상호작용에 의한 종주도 측정방법 연구

임창호(Chang ho Yim) 한국지역학회 1987 지역연구 Vol.3 No.-

Following M. Jefferson`s opening discussion on the primate city in a national urban system, there have been long lasting concerns and debates on the pros and cons regarding the primacy phenomenon. From both theoretical and policy making perspectives studies have been conducted in many nations, in particular, of less developed world, where the high degree of primacy is prominent and often considered problematic. Among others, interest was centered on the relationship between the degree of primacy and the national economic efficiency. Despite the wide-ranging analyses of the primacy, however, there seems to remain a fundamental problem of measuring the degree of primacy in a national urban system. In this paper it is pointed out that often used primacy measures have flaws with them. Noting the deficiencies, a new primacy measurement scheme, based on both the population size distribution of cities and the locational interrelationships among them in a national urban system, is proposed and empirically tested. It is hoped that the use of the proposed approach with reference to spatial interactions among cities within an urban system can shed a light on the relationship between the degree of primacy and various forms of socio-economic changes in many countries.

수도권 대학정원정책의 수도권 인구분산효과에 관한 연구

임창호(Chang Ho Yim),구자훈(Ja Hoon Koo),안근원(Keun Won Ahn) 한국지역학회 1993 지역연구 Vol.9 No.1

University enrollment has long been regarded as one of the major factors inducing population concentration in Seoul and the Capital Region of Korea. Consequently, since early 1980`s increases in enrollment and new establishments of extention universities beyond the boundary of Seoul, has been promoted, while university enrollment quota in Seoul has been strictly controlled. The degree of actual population dispersal, however, resulting from such a university enrollment policy has not been empirically tested. This paper aims at: First, identifying the trend of population growth and evolution process of the university enrollment policy in the Capital Region; Second, comparing the degree of influence of university enrollment on population concetration in the Capital Region relative to other factors; Third, measuring actual effect of the enrollment. control on population dispersal out of Seoul and the Capital Region. Major findings are as follows: First, only a week correlation between population and university enrollment growth trends was found; Second, the relative degree of influence on population concentration in the Capital Region,, were ordered, in the order of magnitude, the physical amenity factor, the socio--cultural amenity factor, the employment climate factor and the educational factor. Third, and most improtant, based on the comparison of spatial distributions of graduated high schools and current residence of the selected university students, the gap between the two distributions was revealed and the inter-regional student population movement was estimated. The result shows that in Seoul`s case about one-half of and in Kyunggi Province`s case about one-fifth of university enrollment size, contributes to population concentration into Seoul. Fourth, as to the universities outside of the Capital Region, little effect in the case of universities located within the commuting distance, and a little effect on population dispersal in the case of universities located beyond commuting distance, were found. In sum, it seems clear that university enrollment policy in the Capital Region, especially in Inchon/Kyunggi Province has not been effective on student population dispersal out of Seoul and the Capital Region. Therefore, it is strongly recommended that university enrollment policy be throughly re-examined from its goal to the implementation means.

간세포암 환자의 종양병기 평가에 대한 Up-to-Seven Score의 임상적 유용성

정창호 ( Chang Ho Jung ),서연석 ( Yeon Seok Seo ),이재민 ( Jae Min Lee ),윤석배 ( Seok Bae Yoon ),윤태정 ( Tae Jung Yun ),임선영 ( Sun Young Yim ),안형진 ( Hyonggin An ),엄순호 ( Soon Ho Um ),김창덕 ( Chang Duck Kim ),류호상 ( Ho 대한간암학회 2014 대한간암학회지 Vol.14 No.1

Background/Aims: Up-to-seven criteria was proven to be useful for predicting prognosis after liver transplantation in patients with hepatocellular carcinoma (HCC). The aim of this study was to evaluate that up-to-seven score could be useful method for prediction of prognosis in patients with HCC who did not undergo liver transplantation. Methods: Between January 2006 and December 2008, 216 HCC patients without vascular invasion, lymph node and distant metastasis were analyzed retrospectively. We investigated the prognostic impact of laboratory findings, clinical characteristics, modified UICC T stage, and up-to-seven score in HCC. The survival analyses were performed using Kaplan-Meier Results: Two-hundred sixteen patients with HCC were included. Age was 60.1±11.3 years and 74.5% were male. Chronic hepatitis B was the most common cause of liver disease (60.6%). T stage was T1, T2, and T3 in 36 (16.7%), 118 (54.6%), and 62 (28.7%) patients, respectively. Up-to-even score was 5.5±4.0 and it was <3 (UTS 1), ≥3 and ≤7 (UTS 2), and >7 (UTS 3) in 36 (16.7%), 133 (61.6%), and 47 (21.8%) patients, respectively. The 10 (8.5%) patients of T2 stage were classified into UTS 3 and 25 (40.3%) patients of T3 stage were classified into UTS 2. The prognosis was significantly different in patients with T2 or T3 according to their UTS. Multivariate analysis showed that Child-Pugh score and UTS were significantly associated Conclusions: Up-to-seven score was useful to predict prognosis and to evaluate tumor stage in patients without vascular invasion, lymph node and distant metastasis.

The Change in Metropolitan Settlement Patterns and Its Implications for Planning Concepts & Policies

임창호(Yim Chang-Ho) 대한국토·도시계획학회 1997 國土計劃 Vol.32 No.5

급격한 기술의 발달과 함께 사회ㆍ경제적 변화로 인하여 대도시권의 공간구조 및 정주패턴은 변화를 거듭하고 있으며, 이러한 추세는 앞으로 더욱 가속화될 전망이다. 대부분의 선진국에서는 제2차 세계대전 이후 지속적인 인구분산과 교외화가 진행되어 왔으며, 일부 도시에서는 도시교외 화단계를 넘어서 상당한 규모의 도시인구가 도시를 탈출하는 현상, 즉 탈도시화(exurbanizaiton)현상이 목격되고 있다. 그러나 이러한 변화에 대한 체계적인 이해가 부족하며, 대응방안도 마련되지 않고 있다. 본 논문은 대도시권 정주패턴변화의 특징을 분석하고, 변화에 대응하는 도시계획 개념, 전략 그리고 정책의 새로운 방향을 제시하는데 그 목적이 있다. 우선 국내외의 관련 문헌연구를 바탕으로 정주패턴변화에 영향을 미치는 요인들을 규명하고, 사례연구지역으로 수도권 내의 준농림지역을 대상으로 실제 공간에 투영되고 있는 현상을 분석하였다. 연구 결과 수도권에서도 탈도시화현상과 유사한 징후가 포착되었다. 이러한 새로운 정주패턴의 출현으로 기존 도시형태모형의 수정뿐만 아니라, 도시계획 전략 및 방법론의 수정이 불가피하며 따라서 계획개념의 전환이 요구된다. 이 글에서는 이러한 변화를 수용할 수 있는 대안으로 ‘다핵집합형 도시구조’를 제안하고 있다. 현재는 새로운 정주패턴 및 도시형태에 대한 종합적이고 다각적인 연구가 요구되는 시점이다. 계획가들이 이러한 변화를 간과할 경우 우리는 시장실패에 이은 또 하나의 실패를 감수해야 할 지 모른다.

혼돈계의 단방향 동기화를 이용한 보안 프로토콜 설계

조창호,임거수,Cho, Chang-Ho,Yim, Geo-Su 한국전자통신학회 2014 한국전자통신학회 논문지 Vol.9 No.10

네트워크의 속도가 향상 되면서 정보를 담고 있는 콘텐츠의 양과 질이 급격히 증가 하고 있다. 이런 정보의 급격한 변화에 맞추어 콘텐츠를 통신상에서 보호할 수 있는 혼돈신호를 이용한 새로운 통신 프로토콜을 다음과 같이 제안한다. 혼돈시스템은 초기치 민감성과 발생된 신호가 잡음과 유사하여 예측이 불가능한 특성을 가지고 있다. 우리는 이런 특성을 갖고 있는 두 개의 혼돈시스템 $F(X_n,Y_n)$와 $G(A_n,B_n)$를 구성하고 F 혼돈시스템의 신호로 G 혼돈시스템을 동기화시켜 발생되는 동일한 혼돈신호를 대칭키로 사용하고, 이렇게 구성된 암호 채널로 데이터를 송수신 하는 방법을 설계 하였다. 제안된 방법을 검증하기 위해 이미지의 암호화 및 복호화로 그 결과를 보였다. 우리가 제안한 방법은 기존의 암호화 통신과 다른 방법으로 추후 관련 분야의 연구에 초석이 될 것으로 생각된다. The quantity and quality of contents containing information are sharply increasing with the rising network speed. In line with this rapid growth of information volume, a new communication protocol using the chaotic signal that can protect contents in communication is proposed as follows. The chaos system has the characteristic of unpredictability due to the sensitive initial values and the similarity of the signals with noise. We configured two chaos systems $F(X_n,Y_n)$ and $G(A_n,B_n)$ that have such characteristics and designed a data communication method using as encryption channel the same chaos signals generated by synchronizing the chaos system G with the F signals. The proposed method was verified with the encryption and decryption of images. The proposed method is different from the existing encrypted communication methods and is expected to lay the foundation for future studies in related areas.is an example of ABSTRACT format.