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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.
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.
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.