맞춤형 국토정보의 효과적 제공을 위한 빈발 패턴 탐사 기법을 활용한 오픈맵 API 기반 프로토타입

이동규,이경민,신동문,김재철,류근호,Lee, Dong-Gyu,Yi, Gyeong-Min,Shin, Dong-Mun,Kim, Jae-Chul,Ryu, Keun-Ho 한국공간정보학회 2010 한국공간정보시스템학회 논문지 Vol.12 No.1

유비쿼터스 도시 환경에서 사용자에게 맞춤형 국토정보를 제공하기 위한 공간 정보 시스템 개발이 대두되고 있다. 공간 정보 시스템은 사용자를 위해 언제 어디서든지 공간 정보를 탐사할 수 있다. 또한, 다른 사용자들에게도 데이터마이닝 기술을 통해 분석된 정보를 제공해 줄 수 있다. 따라서, 본 논문에서는 빈발 패턴 기법을 활용한 오픈맵 API 기반 프로토타입을 제안한다. 제안하는 프로토타입은 지오포토의 위치 데이터를 기반으로 사용자에게 흥미로운 여행 코스와 우리가 알지 못했던 명소를 탐사할 수 있다. 또한, 제안된 프로토타입은 20가지의 오픈맵 API 기반 지도 중 사용자에 의해 선택된 지도에 분석된 공간 패턴을 표현할 수 있는 최초의 시도이다. 우리의 프로토타입은 스마트폰 등의 모바일 단말기에서도 응용될 수 있다. Spatial information systems have developed in order to provide users with customized land information in u-City environments. The spatial information systems can detect spatial information for users anytime anywhere. Information which is analyzed by data mining techniques can be offered for other users. Therefore, we propose open map API-based prototype which utilizes frequent pattern mining technique. Proposed prototype can mine interesting trip routes and unknown attractions in location data of geophoto. Also, proposed prototype is the first attempt which analyzes spatial patterns can be represented on a map which is selected by users. Our prototype can be applied to the smart phone like mobile devices.

대용량 공간 데이터로 부터 빈발 패턴 마이닝

이동규,이경민,정석호,이성호,류근호,Lee, Dong-Gyu,Yi, Gyeong-Min,Jung, Suk-Ho,Lee, Seong-Ho,Ryu, Keun-Ho 한국공간정보학회 2010 한국공간정보시스템학회 논문지 Vol.12 No.1

공간 및 비 공간 데이터에서 알지 못했던 패턴을 탐사하는 빈발 패턴 탐사 기법은 마이닝 분야에서 가장 핵심적인 부분으로 많은 연구가 활발히 진행되고 있다. 기존의 자료구조들은 트리 구조 및 배열 구조로써 밀집 또는 희소 빈발 패턴에서 성능 저하를 보인다. 대용량의 공간 데이터는 밀집 및 희소 빈발 패턴을 둘 다 가지므로 단일 알고리즘으로 빠르게 탐사 하는 것은 중요하다. 본 논문에서는 단일 알고리즘을 사용하면서도 밀집 및 희소 빈발 패턴 모두에 대해 빠르게 빈발 패턴을 마이닝할 수 있는 압축된 패트리샤 빈발 패턴 트리라는 새로운 자료구조와 이를 사용한 빈발 패턴 마이닝 알고리즘을 제안한다. 실험 평가는 제안한 알고리즘이 대용량 희소 및 밀집 빈발 데이터에서 기존의 FP-Growth 알고리즘 보다 약 10배 정도 빠르게 빈발 패턴을 탐사하는 것을 보인다. Many researches of frequent pattern mining technique for detecting unknown patterns on spatial data have studied actively. Existing data structures have classified into tree-structure and array-structure, and those structures show the weakness of performance on dense or sparse data. Since spatial data have obtained the characteristics of dense and sparse patterns, it is important for us to mine quickly dense and sparse patterns using only single algorithm. In this paper, we propose novel data structure as compressed patricia frequent pattern tree and frequent pattern mining algorithm based on proposed data structure which can detect frequent patterns quickly in terms of both dense and sparse frequent patterns mining. In our experimental result, proposed algorithm proves about 10 times faster than existing FP-Growth algorithm on both dense and sparse data.

물리적 환경요인이 스마트폰의 WiFi & 3G 통신의 전력소모량에 미치는 영향

이동규(Dong Kyu `Roy` Lee),정종택(Jongtack Jung),이웅희(Woonhee Lee),김황남(Hwangnam Kim) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.11

변이형 오토인코더를 이용한 탄도미사일 궤적 증강기법 개발

이동규,홍동욱,Dong Kyu Lee,Dong Wg Hong 한국시스템엔지니어링학회 2023 시스템엔지니어링학술지 Vol.19 No.2

Trajectory of ballistic missile is defined by inherent flight dynamics, which decided range and maneuvering characteristics. It is crucial to predict range and maneuvering characteristics of ballistic missile in KAMD (Korea Air and Missile Defense) to minimize damage due to ballistic missile attacks, Nowadays, needs for applying AI(Artificial Intelligence) technologies are increasing due to rapid developments of DNN(Deep Neural Networks) technologies. To apply these DNN technologies amount of data are required for superviesed learning, but trajectory data of ballistic missiles is limited because of security issues. Trajectory data could be considered as multivariate time series including many variables. And augmentation in time series data is a developing area of research. In this paper, we tried to augment trajectory data of ballistic missiles using recently developed methods. We used TimeVAE(Time Variational AutoEncoder) method and TimeGAN(Time Generative Adversarial Networks) to synthesize missile trajectory data. We also compare the results of two methods and analyse for future works.

Microwave 를 이용한 연소가스 처리시스템 개발

이동규,김동식,김재설 ( Dong Kyu Lee,Dong Sik Kim,Jae Surl Kim ) 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.10 No.2

Abstract_Roman Low temperature effluent gases from combustion systems are generally hard to recover economicaUy since the sour gases(Nox and Sox) contained in the flue gas are condensed during the cooling process and thus produce the sour solution which

귀인이론(歸因理論) 기반의 지역 공공인재학부 교육사업 성과평가에 관한 연구 - 동아대학교 석당인재학부 교육사업에 있어 집단별 의식차이 분석을 중심으로 -

이동규(Dong-Kyu Lee),민연경(Youn-Kyoung Min) 한국지방행정학회 2017 한국지방행정학보 (KLAR) Vol.14 No.1

The purpose of study is to identify influences of attribution of university headquarters, executive direction and management, student three groups - establishment･ establishment, management, entrance - to the performance evaluation index. This study offers development plan of the public sector honors college by analysing difference in group consciousness to the comparative significance of performance evaluation index for co-creation. The study attempt to investigate attribution theory and difference in group consciousness based on the 1st actions of 3 group results(establishment･ establishment, management, entrance) affect the performance evaluation indexes. For that, this study has developed 19 indicators, 5 Items for performance evaluation using program logic model and AHP method focusing on the seokdang honors college of Dong-A University. Analysis was pronounced differences between groups consciousness. University headquarters perceived the number of people passing exams, employment rates than other groups as important factors because university provides various benefits to attract talented student. On the other hand, executive direction and management perceived performance index of consultation program, training, attendance, the number of host because student motivation recognized as important. Student who demand for education services are recognized scholarship benefits(budget), the number of people passing exams of imput･initiative outcome item as major factors by opportunity costs for entrance to university located in Seoul. The study results suggest need for student･parents satisfaction as key performance indicator, good communication within the 3 groups of public sector honors college in order to improve the quality of operation since awareness about 17 of 19 performance indicators was a big gap. The study shows need for maintaining consistency･durability in government s policy to foster motivated talent in the community and joint venture creation.

Cognitive Radio 시스템 환경에서의 다중 홉 릴레이 전송 기법

이동규,신정채,임은택,이현우,조호신,Lee, Dong-Kyu,Shin, Jung-Chae,Lim, Eun-Taek,Lee, Hyun-Woo,Cho, Ho-Shin 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.9a

본 논문에서는 IEEE 802.22 기반의 인지라디오 시스템에서 다중 홉 릴레이 방식의 적용 방안을 제안한다. 먼저, 중계기를 통한 전송 시나리오를 가정하고 이를 지원하기 위한 물리 채널 프레임 구조를 예시한다. 다음으로, 분산 감지 (distributed sensing) 방식을 이용한 가용 채널 결정 방식을 제안하고 이를 토대로, 기지국 중심의 중앙집중형 (centralized) 채널 할당 기법 및 릴레이 전송을 위한 중계기 선택 알고리즘을 개발하였다. 그리고 수학적 해석과 시뮬레이션을 통한 성능 분석 결과는 제안한 다중 홉 릴레이 방식이 중계기를 사용하지 않은 기존의 인지 라디오 시스템에 비해 스펙트럼 이용효율과 시스템 수율 측면에서 성능 향상이 있음을 보여준다. In this paper, a multi-hop relaying transmission scheme is analyzed regarding its feasibility and potentiality in the IEEE 802.22-based cognitive radio (CR) environment. Shortly, basic design issues are addressed such as relay station (RS) deployment and a frame structure of physical channel to escape inter-hop interference. This paper mainly develops a radio resource management scheme based on spectrum sensing results aggregated from CR secondary nodes and improves the opportunistic spectrum sharing efficiency. In particular, a decision rule about a channel availability is made using a distributed sensing method. Subsequently, spectrum allocation and routing path decision procedures are proposed to establish a link from source to destination with a hop-by-hop manner. Simulation results show that the proposed multi-hop relaying scheme is substantially profitable in CR environments if the number of hops and RS deployment are designed in such a way that the spectrum sharing gain is larger than spectrum division loss which is inherently induced in multi-hop relaying systems.

건설재료의 안전적 제어를 위한 표준물질 (Standard Reference Materials) 도출

이동규,이건우,최명성,Lee, Dong Kyu,Lee, Keon Woo,Choi, Myoung Sung 한국안전학회 2017 한국안전학회지 Vol.32 No.5

The purpose of this study is to develop standard reference materials for safety control of construction materials considering the required performance of standard materials including flow performance incorporating particles. The flow characteristics of concrete are very complicated depending on mixing proportions of constituent materials, admixtures, amount of mixing, type of mixer, time of mixing, temperature and so forth. Uncertainties and multidimensional properties of concrete have been evaluated through various studies but there are few researches for the development of standard reference material. In this study, based on the rheological concept, the flow performance of construction materials was evaluated to understand the properties of standard reference materials and was finally obtained representing materials which simulate the standard reference materials.

EEPROM을 이용한 전하센서

이동규,김해봉,양병도,김영석,이형규,Lee, Dong-Kyu,Jin, Hai-Feng,Yang, Byung-Do,Kim, Young-Suk,Lee, Hyung-Gyoo 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.8

The devices based on electrically erasable programmable read-only memory (EEPROM) structure are proposed for the detection of external electric charges. A large size charge contact window (CCW) extended from the floating gate is employed to immobilize external charges, and a control gate with stacked metal-insulator-metal (MIM) capacitor is adapted for a standard single polysilicon CMOS process. When positive voltage is applied to the capacitor of CCW of an n-channel EEPROM, the drain current increases due to the negative shift of its threshold voltage. Also when a pre-charged external capacitor is directly connected to the floating gate metal of CCW, the positive charges of the external capacitor make the drain current increase for n-channel, whereas the negative charges cause it to decrease. For an p-channel, however, the opposite behaviors are observed by the external voltage and charges. With the attachment of external charges to the CCW of EEPROM inverter, the characteristic inverter voltage behavior shifts from the reference curve dependent on external charge polarity. Therefore, we have demonstrated that the EEPROM inverter is capable of detecting external immobilized charges on the floating gate. and these devices are applicable to sensing the pH's or biomolecular reactions.

이미지 조도조절 및 감지를 활용한 특징점 검출기

이동규(Dong Kyu ‘Roy’ Lee),김황남(Hwangnam Kim) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.6