화일 캐슁 시스템에서 순환 참조의 효과적인 처리

김종헌(Jong-Hun Kim),민상렬(Sang Lyol Min),노삼혁(Sam H. Noh) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.4

처리기의 속도가 고속화되면서 처리기와 디스크 사이의 속도 차이가 갈수록 커지고 있다. 이러한 속도 차이를 극복하기 위하여 컴퓨터 시스템의 다양한 부분에서 캐쉬를 사용한다. 특히 버퍼 캐쉬(buffer cache)는 참조될 가능성이 큰 디스크 블럭들을 주 기억장치에 보관하여 디스크 입출력 횟수를 줄이고 나아가 시스템의 성능을 향상한다. 이러한 버퍼 캐쉬의 블럭 교체 기법으로는 LRU (Least Recently Used) 블럭 교체 기법이 많이 사용되는데, 이 기법에서는 한 번만 참조된 블럭들도 캐쉬에 너무 오래 보관되는 단점이 있다. 이런 단점을 보완하기 위해 여러 기법들이 제안되었다. 그러나 이러한 기법들은 순환 참조(looping sequential reference)를 적절히 처리하지 못하는 단점이 있다. 이에 본 논문에서는 디스크 블럭에 대한 참조를 그 행태에 따라 모델링하고 순환 참조를 효과적으로 찾아내어 처리하는 기법을 제안한다. 또 제안하는 기법의 비용과 오프라인 최적 알고리즘의 비용을 비교하여 이 기법이 2-경쟁적(2-competitive)임을 보이며, 트레이스 기반 모의실험을 통하여 캐쉬 적중률이 6.62%까지 향상됨을 보인다. The gap between processor and disk speed is becoming wider as the speed of processors becomes much faster. To overcome the speed gap, caches of various forms have been used. One example is the buffer cache that is maintained in mam memory, where disk blocks that are likely to be accessed in the near future are kept. To manage the buffer cache, the LRU (Least Recently Used) block replacement policy is generally used but it has a drawback that a block may be kept long time even though it is referenced only once. Other techniques have been proposed to overcome such shortcomings. However, they largely ignore looping sequential references. So, in this paper we propose a technique which detects looping sequential references and efficiently handles them. And we show that the proposed technique is 2-comtetitive through the competitive analysis. In addition, we evaluate our proposed scheme using a trace-driven simulation. According to the simulation results our proposed technique improves hit ratio up to 6.62%.

한국주재 러시아 총영사 플란손의 착임과정에서 제기된 인가장 부여 문제에 관한 연구

김종헌 ( Jong Heon Kim ) 고려대학교 역사연구소 2011 사총 Vol.72 No.-

George de Planson was the Russian Consul-General in Seoul from 1906 to 1908 year. The name of the Korean Emperor was written on Plason`s patent. It means. that Russia has not recognized the right of Japan to a protectorate over Korea. Therefore, Japan could not accept such diplomatic action Russia. Japan used the occasion to resolve a question of Japanese right for protectorate over Korea. After the Russo-japanese war in 1904-1905 Portsmouth peace treaty was concluded between Russia and Japan. Russia believe that independence of Korea is not ignored by this treaty. And also believe the treaties, which signed in 1884 and 1888 years between Russia and Korea, still have the force. Therefore, by the insistence of russian government, the Russian Consul-General in Seoul would have to get his exequatur from the Foreign Office of korean government in Seoul. Japan could not accept that russian argument. Russo-japanese diplomatic war over Korea began. Especially, marquis Ito thought that Russia deliberately ignores the rights of Japan in Korea. And he did not want, that this case become a precedent for non-recognition of Japan`s right to protection on Korea. But this problem has been solved surprisingly. The new minister of foreign affairs of Russia, Izbolskii has pursued pro-English policy and on the extension of this policy he also pursued pro-Japan policy. He accepted all requests from Japan. So He agreed with issue of new patent for Planson and receipt of Plason`s exequatur from Japanese Government. However, the question of treaties between Korea and Russia had no resolution. Therefore, Japan had to sign another two new treaties with Russia in 1907 and 1910 year.

“거대한 게임”과 영국의 극동 탐사활동에 관한 연구

김종헌 ( Jong Hoen Kim ) 고려대학교 역사연구소 2009 사총 Vol.69 No.-

에너지 위기시대 한옥의 새로운 가능성

김종헌(Kim Jonghun) 대한건축학회 2008 建築 Vol.52 No.1

팔미도등대의 구조적 특성과 그 가치에 대한 연구

김종헌(Kim Jong-Hun),김태우(Kim Tae-Woo) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(계획계)

The purpose of this study was to analyze the value and structural characteristics of Yodolmi Island Lighthouse which is the one of the first lighthouse by the Department of Korean Customs Service. And also Yodolmi Island Lighthouse was the first concrete structure in 1903. But construction method for Yodolmi Island Lighthouse is different from contemporary technique. It looks like stone layering. So it is an structure in transition from stone to concrete in lighthouse. But Observation Island Lighthouse, North Watcher Rock Lighthouse and White Rock Island lighthouse, which were built by stone in same year. And Yodolmi Island Lighthouse is flanked by walls on either side to render it conspicuous as a day mark.

도면 분석을 통한 덕수궁미술관의 고전주의적 특성에 관한 연구

김종헌,Kim, Jong-Hun 한국건축역사학회 2015 건축역사연구 Vol.24 No.6

Deoksugung Palace Art Museum was built in 1938 as the first professional art museum in Korea. In 2015, National Research Institute of Cultural Heritage published a book on architectural drawings of this building. This book, called Architectural Drawings of the Deoksugung Palace Art Museum, consists of 646 sheets, 23 types of documents, as well as other historical letters. This paper focuses on the analysis of the characteristics of classicism in Architectural Drawings. It shows that every dimensions of drawings were controled by 3 partition composition through the analysis of architectural plan drawings, elevation drawings and even section drawings. Thus, Classicism for the museum is not about classical elements but the principle of composition of each elements for the construction. This paper further argues that Deoksugung Palace Art Museum exemplifies beautiful Classicism architecture which follows the principle of classical architectural composition.

핵심역량 평가 기반 수업에 대한 과학영재학생들의 정서적 반응

김종헌(Kim Jongheo),이희복(Lee Heebok) 학습자중심교과교육학회 2018 학습자중심교과교육연구 Vol.18 No.4

본 연구에서는 과학영재학교 학생 47명을 대상으로 핵심역량 평가 기반 수업에 대한 정서적 반응을 살펴보아 교육과정, 수업, 평가의 일관성 유지에 대한 시사점을 얻고자 하였다. 2015 개정교육과정의 핵심역량을 바탕으로 평가 루브릭을 작성하고 미래와 관련된 창의적인 아이디어를 중심으로 모둠별 프로젝트 학습과 토론대회를 실시하여 창의적 사고역량, 공동체 역량, 의사소통 역량의 신장을 도모하였다. 수업 전 후 설문으로 학생들의 정서적 반응을 조사하여 분석한 결과 가장 많은 학생들이 토론 중심으로 이루어지는 수업에 대해서는 긍정적이었지만 평가에 대해서는 부정적이었다. 상대적으로 교사의 관찰평가를 가장 싫어하고, 특히 기존의 평가 방식에서 높은 학업성취도를 나타내는 학생들일수록 핵심역량 평가 기반의 수업에 대해 부 정적이었지만 동료평가는 선호하는 것으로 나타났다. 또한, 핵심역량 중심의 수업과 평가가 일치할 때 학생들은 핵심역량의 함양을 위해 노력하는 것으로 나타났고 여러 명의 평가자가 공동 평가할 때 평가 결과에 대해 항의하지 않았다. 핵심역량 기반 수업에 대한 동기유발이 학생들의 긍정적인 정서와 뚜렷한 양적 상관관계를 보였으며, 학생들이 자가 평가한 의사소통 역량은 다른 핵심역량과 뚜렷한 양적 상관관계를 보였다. In this study, 47 students from science gifted students were asked to evaluate the emotional response to the core competency evaluation class and to obtain implications for the consistency of the curriculum, teaching and evaluation. Based on the core competencies of the 2015 revised curriculum, we created evaluation rubrics and promoted creative thinking, communicative competence, and communication competence by conducting group project learning and discussion competitions centering on creative ideas related to the future. As a result of analyzing the students emotional responses by pre and post-class questionnaire, the most students were positive about the discussion-based lesson but negative about the evaluation. In particular, students who disliked teacher observations the most, and especially those who showed high academic achievement in the existing evaluation method, were negative about class based on core competency evaluation, but peer evaluation was preferred. In addition, when core competency-centered instruction and core competency evaluation were in agreement, it was found that students tried to cultivate their core competencies. When multiple evaluators jointly assessed, the students did not protest the evaluation results. The motivation for core competency-based instruction was positively correlated with the positive emotions of the students, and self-evaluated communication capacity of students showed a significant positive correlation with other core competencies.

무선 이동통신망을 이용한 IoT 통신의 혼잡 문제로 인한 접속 지연시간 모델링과 예측 기법에 관한 연구

김종헌(Jonghun Kim),류석(Seok Ryu),송승범(Seungbeom Song),이재용(Jaiyong Lee) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1

이동성 지원 메쉬 네트워크를 위한 클러스터 기반의 멀티 채널 MAC

김종헌(Jonghum Kim),전한얼(HahnEarl Jeon),이재용(Jaiyong Lee),박수범(Soo Bum Park),유영빈(Young Bin You) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.2B

전술 네트워크는 통신 인프라의 부족과, 산악 지형 등의 지형적 특성에 의하여 원활한 통신이 이루어지지 않는 경우가 생긴다. 무선 메쉬 네트워크 (WMN)는 메쉬 포인트들의 멀티-홉 통신을 통하여 별도의 통신 인프라 없이 넓은 지역에 대하여 무선 통신을 공급한다. 따라서, 전술 네트워크에서 무선 메쉬 네트워크의 활용 가능성은 매우 크다. 그러나 기존에 연구되었던 무선 메쉬 네트워크는 메쉬 네트워크를 구성하는 메쉬 포인트들의 이동성을 고려하지 않는다. 본 논문에서는 전술 상황을 고려하여 메쉬 포인트들이 그룹 이동성을 갖을 때 예상되는 MAC의 collision 문제와 PHY의 채널 사용 문제를 해결한다. Wireless mesh network (WMN) has recently emerged as a promising technology for tactical operation. If a platoon is organized with MPs, this system is suitable for tactical coverage is given for battle field where there is a shortage of wired infrastructure. However, MPs of typical WMN are generally fixed. This condition does not apply to diverse tactical scenarios. In this paper, it is considered that MPs have group mobility for flexible tactical networks. We propose cluster based multi-channel MAC scheme for mobilie WMN with single antenna condition. We have reduced the collision problems and message storming problems occur by mobility, so the reliability of WMN has been improved. Consequently, reliable communication is guaranteed by our framework in mobile WMN.

슬관절 전치환술 실패 양상 분석

김종헌 ( Jong Heon Kim ),최충혁 ( Choong Hyeok Choi ),강석근 ( Suk Keun Kang ),이봉근 ( Bong Keun Lee ),손기훈 ( Kee Hoon Shon ),정현기 ( Hyun Kee Chung ) 대한슬관절학회 2003 대한슬관절학회지 Vol.15 No.2