셋-프루닝 이진 검색 트리를 이용한 계층적 패킷 분류 알고리즘

이수현(Soohyun Lee),임혜숙(Hyesook Lim) 한국정보과학회 2008 정보과학회논문지 : 정보통신 Vol.35 No.6

인터넷 라우터에서의 패킷 분류는 들어오는 모든 패킷에 대하여 패킷이 입력되는 속도와 같은 속도로 수행되어야 하는데, 여러 헤더 필드에 대해 다차원 검색을 수행하여야 하므로, 라우터 설계에 있어 가장 어려운 문제중의 하나이다. 계층적 패킷 분류 구조는 하나의 필드 검색이 끝날 때마다 검색 영역이 현저하게 줄어듦으로 매우 효율적이다. 그러나 계층적 구조들은 빈 노드와 역추적이라는 두가지 문제를 내재하고 있다. 본 논문에서는 두가지 문제를 동시에 해결하는 새로운 계층적 패킷분류 구조를 제안한다. 역추적 문제는 셋-프루닝 기법을 이용하여 해결하였으며, 이진 검색트리를 적용하여 빈노드를 제거하였다. 시뮬레이션 결과 제안된 알고리즘은 메모리 요구량의 증가 없이 검색 성능을 현저히 향상시킴을 확인하였다. 또한 셋-프루닝에 있어 제한된 룰의 복사를 적용하는 최적화 기법을 제안한다. Packet classification in the Internet routers requires multi-dimensional search for multiple header fields for every incoming packet in wire-speed, hence packet classification is one of the most important challenges in router design. Hierarchical packet classification is one of the most effective solutions since search space is remarkably reduced every time a field search is completed. However, hierarchical structures have two intrinsic issues; back-tracking and empty internal nodes. In this paper, we propose a new hierarchical packet classification algorithm which solves both problems. The back-tracking is avoided by using the set-pruning and the empty internal nodes are avoided by applying the binary search tree. Simulation result shows that the proposed algorithm provides significant improvement in search speed without increasing the amount of memory requirement. We also propose an optimization technique applying controlled rule copy in set-pruning.

청년 여성 1인 가구의 범죄두려움에 따른 시선 주목도 분석 - 다세대 · 다가구 주택의 출입공간을 대상으로 -

이수현(Lee, Soohyun),하미경(Ha, Mikoung),변기동(Byun, Gidong) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.1

Due to the change in family dynamics and modern lifestyles, single female house holds are expected to increase. That is to say, the proportion of the group of high anxiety toward crime will be increasing. Therefore, more effective and practical measures to better recognize, mitigate and manage the fear of crime is necessary to establish. This study examines the area around the entrance of a low-rise residential area where young female tenants are daily concerned for their safety. Surveys and eye-tracking experiments were conducted in identifying major physical environmental factors related to the fear of crime in this particular area. This research unveiled that the main physical factors associated with the fear of crime involved the level of attention given to CCTV signs, roads in front of buildings, entrance floors, lighting and windows. For CCTV signs, participants with higher ‘General fear of crime’ shows lower the attention to CCTV signs. This suggests that making single-person households more aware of the existence of CCTV’s by the size or design of the signs could help alleviate the fear of crime. For survey participants with high ‘Fear of property crimes’ were sensitive to their surrounding environment, therefore, enhancing the private image of an access space through proper lighting installation along with better visualizations of the boundaries for the entrance area and nearby roads were deemed important. it was also significant to develop a maintenance system. Lastly, although attention to windows varied per location, installing a crime preventative tool could be a possible approach to dissipate the fear of physical crime. As these suggested improvements are applied and additional factors discovered, further analysis is needed after each change to find more appropriate methods to mitigate the fear of physical crime.

건축 공간 분야의 국내 시선추적 연구 경향 분석

이수현(Lee, Soohyun),하미경(Ha, Mikyoung),변기동(Byun, Gidong) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.1

This study attempted to understand the eye tracking experiments, which are gradually expanding in scope of application, and to grasp the trend and flow of eye research conducted in the fields of architecture and space. The results of this study are as follows. First, the trend of research has been confirmed from analysis methods and gaze characteristics to studies to examine users" spatial perception. Although some research to establish a specific analysis method will continue in the future, research for the purpose of confirming user perception is expected to become more active. Second, so far, eye tracking experiments have been mainly conducted on indoor spaces, 20 to 30 participants mainly participated using fixed devices. As a criterion for analysis, the index related to fixation was the most. Therefore, the most appropriate to apply a method of analyzing attention to internal space, and when conducting an experiment on an external environment that is difficult to control, it is necessary to designate an area of interest and check recognition based on this. Third, it is necessary to grasp the user"s intuitive perception of environmental factors by analyzing the results of the eye tracking experiment, which is quantitative data, and the results of the survey, which is qualitative data. If the two methods are combined, eye tracking experiments can be used in a more objective and useful way. The results of this study are meaningful as basic studies that can identify specific fields that can be used for future gaze tracking experiments and refer to the framework and research method of the study. In the future, it is necessary to continuously analyze research trends based on steady interest in related research.

기초 한국학 교육의 개념 설정과 내용 구성에 관한 연구

이수현 ( Soohyun Lee ),이선중 ( Sunjoong Lee ) 사단법인 아시아문화학술원 2020 인문사회 21 Vol.11 No.6

본 연구는 점차 다양해지는 한국어 학습자들의 요구에 맞춘 새로운 교육 영역에 대한 개념을 설정하고 나아가 해당 교육을 구성하면서 획득한 경험적 지식에 대해 성문화하는 데 목적을 가진다. 본고는 일본 대학에서 한국어를 전공하는 고급 학습자들을 대상으로 ‘기초 한국학’이라는 교육 영역의 개념을 설정하고 해당 영역의 교육과정과 교육 내용을 구축해 가는 과정을 서술하는 것을 통해 해당 교육이 가지는 개념적 특징과 실행적 특징을 밝히고자 하였다. 본고는 높은 한국어 숙달도를 가진 학습자들이 한국 사정에 대해서도 해박하길 바라는 사회의 기대와 요구에 부응하기 위해 실행되어야 하는 교육 내용이 무엇인지에 대해 고찰하고 실행한 과정을 상술했다. 외국인 유학생으로 하여금 한국에서 유학한 경험이 본인의 세계에서 메리트로 작용하는 데 본 연구의 내용이 밑거름이 되기를 기대한다. This study codified the empirical knowledge gained by setting up the concept of a new educational area and building its contents. This study sought to reveal the conceptual and practical characteristics of the educational field called ‘Basic Korean Studies.’ To that end, the study sequentially described the process of setting up the concept of “Basic Korean Studies” for advanced learners majoring in Korean at Japanese universities and establishing curricula and educational contents in that area. Society hopes that learners with high proficiency in Korean will also be able to understand the Korean affairs. In this study, we examined and detailed the training content that should be implemented to implement a talent image that can meet the expectations and needs of these societies. The content of this research will be the foundation for foreign students’ experience in studying in Korea to serve as a merit in their own world.

공간구문론을 이용한 서울과 평양의 도시구조 분석

이수현(Lee, Soohyun),변기동(Byun, Gidong) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2

The purpose of this study is to analyze the differences in urban spatial configuration between Seoul and Pyongyang. Each city was quantitatively analyzed by Space syntax methodology. For the analysis, local and general integration, intelligibility, and synergy indicators were used which were calculated by the Depthsmap Program. As a result, firstly, Seoul has a shallow urban spatial configuration on a local scale, but Pyongyang is forming a shallow spatial structure only in the entire city. Secondly, Seoul shows higher spatial awareness than Pyongyang. Thirdly, Seoul forms a polycentric structure and Pyongyang has shown a monocentric structure. It is meaningful that the urban configuration of Seoul and Pyongyang, which have been studied qualitatively, was quantitatively compared and analyzed. Nevertheless, there are limitations that the spatial boundary of Seoul was limited to the past, and that there were inherent difficulties in accessing Pyongyang-related data.

공간구조에 따른 대학캠퍼스 유형화 연구

이수현(Lee, Soohyun),변기동(Byun, Gidong),하미경(Ha, Mikyoung) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.8

Due to a sharp drop in the school-age population, universities are facing the need for changes to secure competitiveness. The overall evaluation of universities is highly correlated with the satisfaction of campus facilities. Therefore, when each university seeks spatial change, it shall formulate an appropriate plan in consideration of the improvement of students’ satisfaction. Based on the current spatial structure of the campus, the study examines the characteristics of each type by dividing major universities into four classifications. First, the ‘Grid campus’ had sufficient support facilities, but lacked a subordinate facilities. Second, the ‘Radial-Disperse campus’ was mainly located in the provinces. They were relatively lacking in basic facilities compared to other groups, but had sufficient subordinate facilities. Third, the ‘Dispersed core Campus’ consists of a number of small public universities. They have a looped or central road circulation, and buildings take an circular or decentralized layout. ‘Dispersed core Campus’ functionally value academic facilities and are characterized by creating open spaces in the center of the campus. Fourth, the ‘Concentrated core Campus’ includes a number of large public universities. They have circulation form of a central road or a looped road and buildings are arranged in a distributed or circular layout. Also, the center of the campus tends to be open-space. It is hoped that the morphological and functional characteristics derived from this study will help understanding the campus spatial and will be used as basic data for campus planning and detailed research in the future.

0.18㎛ CMOS 공정을 이용한 레티나 뉴런 모델

이수현(Soohyun Lee),응우웬반하(Nguyen Van Ha),김부강(Bookang Kim),이자경(Jakyeong Lee),박용수(Yongsu Park),송한정(Hanjung Song) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6

한일 기계번역을 위한 보문의 수식 Scope 해석

이수현(SooHyun Lee) 한국정보과학회 언어공학연구회 1996 한국정보과학회 언어공학연구회 학술발표 논문집 Vol.1996 No.10

한글 인터넷 정보검색 시스템의 기술방향

이수현(SooHyun Lee),박동인(DongIn Park) 한국정보과학회 언어공학연구회 1996 한국정보과학회 언어공학연구회 학술발표 논문집 Vol.1996 No.10

경력관리시스템과 조직몰입

이수현(Lee, Soohyun),석진홍(Seok, Jinhong),박우성(Park, Woosung) 한국노동연구원 2013 노동정책연구 Vol.13 No.3

본 연구는 경력관리시스템이 종업원의 조직몰입에 미치는 영향을 확인하는 한편, 다른 인적자원관리제도와의 상호작용 효과를 검증하는 것을 목적으로 하고 있다. 이를 위해 한국직업능력개발원에서 실시한「제3차 인적자원 기업패널」자료를 사용해 실제 기업에서 경력관리의 일환으로 실행되고 있는 제도들을 조합하여 이것이 조직몰입에 미치는 영향을 분석하였고, 이와함께 고성과 HRM이 미치는 조절효과를 검증하였다. 또한 분석 과정에서 일어나는 레벨 이슈를 해결하기 위해 HLM(Hierarchial Linear Modeling : HLM)을 이용한 다수준 분석을 실시하였으며, 그 결과 경력관리시스템은 조직몰입에 긍정적인 영향을 미치는 것으로 나타났고, 고성과 HRM과 경력관리시스템의 상호작용 효과 역시 확인되었다. 이러한 시도는 경력관리시스템에 대한 이해를 넓히고 실제 기업 현장에서도 경력관리시스템의 효과를 제고할 수 있는 중요한 시사점을 제공할 수 있을 것으로 기대된다. This study attempts to identify the effects of Career Management Practice on organizational commitment and interactive effects on relations between other human resource practices. The data from KRIVET was used to examine the relations of variables. Also, Hierarchical Linear Modeling method was used to solve the level issue between Organizational variable and personal variable. The result of this study suggests that Career development practice have a positive effects on organizational commitment and the interactive effect with HPWS(High Performance Work System) is statistically significant. Also, The implications, future directions and limitation of this study is discussed.