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- 저자 : 김도형(Dohyung Kim) (검색결과 161 건)
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동적 저궤도 위성 네트워크를 위한 Dueling DQN 기반 라우팅 기법
김도형,이상현,이헌철,원동식,Dohyung Kim,Sanghyeon Lee,Heoncheol Lee,Dongshik Won 대한임베디드공학회 2023 대한임베디드공학회논문지 Vol.18 No.4
This paper deals with a routing algorithm which can find the best communication route to a desired point considering disconnected links in the LEO (low earth orbit) satellite networks. If the LEO satellite networks are dynamic, the number and distribution of the disconnected links are varying, which makes the routing problem challenging. To solve the problem, in this paper, we propose a routing method based on Dueling DQN which is one of the reinforcement learning algorithms. The proposed method was successfully conducted and verified by showing improved performance by reducing convergence times and converging more stably compared to other existing reinforcement learning-based routing algorithms.
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김도형(Kim, Dohyung) 연세대학교 강진다산실학연구원 2016 다산과현대 Vol.9 No.-
Modern history of Korea was a development process of nationalism. Nationalism formed in the forced order of Japanese imperialism was the driving force which prevented invasions from foreign nations and tried to reform Korea into a modern society. Formation of nationalism was aprocess of securing the homogeneity of Korean ethnicity. Nationalism could be easily formed in Korea as Korea has maintained ethnic and cultural homogeneity in its history for a long time. Especially, Silhak (實學, Practical and Realist School of Confucianism) which appeared in late Chosun dynasty criticized Sinocentric Huayilun or Hwayiron in Korean pronunciation (華夷論, Theory of the Civilized and the Barbarians) while elucidating excellence of Korean culture, and the historical studies by Silhak became the very foundation of nationalism. Those who paid attention to social reform theory and history of Silhak under the invasion of imperialism were Eun Sik Park, Ji Yeon Jang and Chae Ho Shin, who planned reforms by compounding New Studies of the West and traditional Old Studies in Korea and established nationalism by succeeding to historical studies of Silkhak School. Spirit for Motherland and patriotism for the nation state to save it from the crisis of colonization was the very core of nationalism and they sought out them in the history. Nationalist history was succeeded to by In Bo Jung in 1930s, who defined traditional academic studies of Korea as ‘Heohak (虛學, Void Studies)’ while emphasizing ‘Silhak (實學)’ and taking note of Yangmingxue (陽明學) as its academic study. He designated ‘spirit of Chosun’ as the spirit of Korean people which had been succeeded in Korean history and consider it as the very essence of history. In Bo Jung tried to solve the problems of Korean people through academic movements to recreate Silhak. While Eun Sik Park and Chae Ho Shin paid major attention to historical theories of Silhak and established them into theory of nationalism, In Bo jung also took additional note of the nature of social reforms of Silhak and developed it into popular academic movements, orienting toward a new theory of nationalism.
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조선해양 CAD 에서 배관 라이브러리 정보의 국제 표준 기반 변환
김도형(Dohyung Kim),한순흥(Soonhung Han) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
Due to the fast increase of offshore project, the need for design model exchange is growing. Owners frequently designate preferred CAD system to be used during the design and production phase in the contract. Shipyards have to use the designated CAD system even though they are not familiar with. Furthermore, the introduction of new CAD system and the design data migration from the legacy CAD system increase the needs of model data exchange. In order to correctly exchange model data, it is essential to build a consistent library before exchanging design models, and this can be achieved by establishing the neutral library which refers to the international standard. In this paper, we propose a method to translate piping library data from AVEVA Marine to the library of Intergraph SM3D through a neutral library which refers to the international standard based on material classification code. Library translation with reference to the international standard can be the basis of independent library which is independent from commercial CAD systems.
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Do social security contributions subsidies reduce undeclared work?Evidence from korea
김도형(Dohyung Kim) 한국재정학회 2017 한국재정학회 학술대회 논문집 Vol.2017 No.-
Using an administrative panel data on over 300,000 …rms in Korea, we examine the e¤ects of the subsidy program for social security contributions on the number of workers covered by the social security. Exploiting variations in location and size of …rms which a¤ected eligibility for the program, we implement a di¤erence-in-di¤erences (DD) and a di¤erence-in-di¤erence-in-di¤erences (DDD) estimation in order to identify the e¤ect of subsidies. Our DD estimates show that the subsidy program increased the number of covered workers by 1.34 percentage point while the DDD estimates indicate an increase in the number of covered workers by 0.71%. These estimates are smaller in size than those reported in previous studies implying massive deadweight losses from the subsidy program. The minimal e¤ects and large deadweight losses of the subsidy scheme may be explained by the design features of the subsidy program in Korea.
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