• Journal of KIISE
• /
• v.43 no.8
• /
• pp.848-856
• /
• 2016

Seeking and recognizing maritime targets are very important tasks for maritime safety. While searching for maritime targets using radar is possible, recognition is conducted without automatic identification system, radio communicator or visibility. If this recognition is not feasible, radar operator must tediously recognize maritime targets using movement features on radar base on know-how and experience. In this paper, to support the radar operator's mission of continuous observation, we propose an algorithm for automatic recognition of an unknown ship using movement features on radar and a method of detecting potential ship related accidents. We extract features from contact range, course and speed of four types of vessels and evaluate the recognition accuracy using SVM and suggest a method of detecting potential ship related accidents through the algorithm. Experimentally, the resulting recognition accuracy is found to be more than 90% and presents the possibility of detecting potential ship related accidents through the algorithm using information of MV Sewol. This method is an effective way to support operator's know-how and experience in various circumstances and assist in detecting potential ship related accidents.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2023.05a
• /
• pp.349-350
• /
• 2023

우리나라는 지속적인 저출산과 고령화로 인해 지방 소멸 위험지역이 점차 늘어나고 있다. 본 연구는 지방 소멸과 관련된 다양한 요인을 '인구 소멸'이라는 키워드를 포함하는 신문 기사에 대한 토픽모델링을 통해 발견하고, 추출된 토픽과 관련된 공공 데이터를 수집하여 비슷한 특징을 가지는 지역을 묶는 군집분석을 수행한다. 그리고 지방소멸위험지수로 분류된 소멸 위험지역과 군집분석 결과를 비교한다.

• Journal of the Korea Convergence Society
• /
• v.8 no.5
• /
• pp.201-211
• /
• 2017

Social scientists have studied interaction between human beings, while computer scientists have expanded the research domain from human-human to human-machine, human-agent, or machine-machine. The reason why an adoption of Smart Work is failed is an anxiety about ICT usage which middle managers have. It is important to explore the concept both to reduce an anxiety on an application and to increase continuance to use it. Therefore this study takes "empathy" as a key factor to play a leading role both to relieve the anxiety about the application and to improve the intention to use it. The data is gathered from a survey of undergraduate who have experience to use MS-Access. The findings show that application empathy decrease the application anxiety, but the empathy increase the continuance mediated by cognitive and affective attitude.

• 한국IT서비스학회:학술대회논문집
• /
• 2002.11a
• /
• pp.106-113
• /
• 2002

아웃소싱 시장의 지속적인 성장에도 불구하고 국내 아웃소싱 시장은 대규모의 계약이 이루어 지지 않고 있다. 아웃소싱의 위험요인이 아웃소싱의 활성화에 장애요인이 될 수 있다. 정보시스템 아웃소싱의 위험요인에 대한 연구는 아웃소싱 수준 및 성과에 영향을 미치는 요소를 중심으로 연구가 진행되어 왔다. 즉, 전략적 효과, 경제적 효과, 기술적 효과와 같은 이익에 대한 연구가 주류를 이루고 있다. 그러나 아웃소싱 위험요인에 대한 연구는 사례가 거의 없고, 성과에 미치는 영향에 대한 실증적인 연구는 진행되지 않고 있다. 또한 아웃소싱 위험요소의 경우 대체로 발주자 입장에서 연구를 수행하고 있어, 실제 수주하고 있는 수주자의 입장에서 위험요소를 분석한 연구는 없는 상황이다. 본 연구는 기존 연구에서 제시된 아웃소싱 위험요소와 국내 정보기술 아웃소싱 상황에 맞는 위험요소를 도출하고, 이들 위험요소가 유발되는 정도가 정보기술 아웃소싱 성과와 어떠한 관계를 가지는지에 대해 실증적으로 연구를 수행하였다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.10
• /
• pp.541-546
• /
• 2020

The surveillance radar for naval ships is an essential equipment of a battle system that executes the detection and tracking of targets, and the shooting support function; it calculates the three-dimensional track of the target range, azimuth, and altitude to carry out its duty. The surveillance radar consists of an antenna, a transceiver, a processing unit, and an air dryer section. The radar radiates the transmission signal on the antenna section, receives the reflected signal from the target, and amplifies the signals on the transceiver section. The signal received from the antenna is used to provide the operator with target information in various ways. This study identified the display problems when the information about the target is displayed through the radar. The causes of the problems were analyzed and improved. The tracking disappearance phenomenon caused by the altered-course of the ship was improved on the TWS tracking algorithm. The validity of the improved TWS tracking algorithm was confirmed by the normal condition of the target status on the B-scope.

• Journal of Korea Society of Industrial Information Systems
• /
• v.20 no.5
• /
• pp.95-105
• /
• 2015

Prior studies have reported equivocal patterns of the results about the relationships between family involvement and firm performance, particularly financial performance. In line with this research trend, this study focuses on non-financial performance that agency costs may marginally influence. tries to identify the relationship between nepotism and the three types of innovation performance, namely corporate entrepreneurship, radical innovation performance, and incremental innovation performance. The results has shown that family involvement is positively correlated with the three types of innovation performance.

• Journal of the Korea Society of Computer and Information
• /
• v.15 no.9
• /
• pp.35-46
• /
• 2010

Sequential pattern mining is one of the essential data mining tasks, and it is widely used to analyze data generated in various application fields such as web-based applications, E-commerce, bioinformatics, and USN environments. Recently data generated in the application fields has been taking the form of continuous data streams rather than finite stored data sets. Considering the changes in the form of data, many researches have been actively performed to efficiently find sequential patterns over data streams. However, conventional researches focus on reducing processing time and memory usage in mining sequential patterns over a target data stream, so that a research on mining more interesting and useful sequential patterns that efficiently reflect the characteristics of the data stream has been attracting no attention. This paper proposes a mining method of sequential patterns over data streams with a gap constraint, which can help to find more interesting sequential patterns over the data streams. First, meanings of the gap for a sequential pattern and gap-constrained sequential patterns are defined, and subsequently a mining method for finding gap-constrained sequential patterns over a data stream is proposed.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2006.11a
• /
• pp.393-396
• /
• 2006

웹의 급속한 성장으로 정보의 양이 많아졌지만 디자인의 비중이 커지면서 웹 문서에 대한 구조를 추출하는데 어려움이 있다. 웹은 사용자가 원하는 정보를 쉽고 정확하게 검색할 수 있도록 웹 문서의 내용을 구조화하여 지속적으로 개선하면서 사용자의 특성과 행동 패턴에 따라 개인화 하여야한다. 이러한 문제를 해결하기 위해서는 웹 문서들 간의 정확한 구조를 추출하는 것이 선행되어야 한다. 본 논문에서는 보다 웹 사이트의 정확한 구조를 추출하기 위한 방법을 제안한다. 제안 방법은 기본적으로 웹문서 태그의 하이퍼링크와 플래시 파일을 2진 형태의 문서로 불러 하이퍼링크를 추출하고 이를 깊이 우선 탐색 알고리즘을 사용하여 방향그래프로 만든다. 하지만 이러한 웹 문서 태그 탐색 시 애플릿이나 스크립트 등에 숨어 있는 하이퍼링크를 찾는 문제와 '뒤로' 버튼 사용 시 웹 접근로그에 기록되지 않는 문제점이 보완되어야 한다. 이를 위해 클릭 스트림을 스택에 저장하여 이미 만들어진 방향그래프와 비교하여 새롭게 찾은 정점과 간선을 추가 삭제함으로써 보다 신뢰성 높은 방향 그래프를 만든다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.10 no.9
• /
• pp.1679-1684
• /
• 2006

DVB-H(Digital Video Broadcasting for Handhold) is a new standard, currently being developed, which defines mobile enhancements for the DVB-T (DVB-Terrestrial) standard. For the reception of service via mobile handheld devices, seamless mobility and power saving are essential requirements of DVB-H. For seamless handover, the receiver should monitor neighboring cells and it increases the power consumption. And so, power efficient handover scheme to support both mobility and power saving is required. In this paper, we propose power efficient handover scheme to reduce power consumption by reducing the number of frequency scanning during the handover. Through the numerical evaluation, we analyze the performance of handover schemes.

• Journal of the Korean Society for information Management
• /
• v.27 no.2
• /
• pp.37-60
• /
• 2010

The purpose of this study is to investigate image search query reformulation patterns in relation to image attribute categories. A total of 592 sessions and 2,445 queries from the Excite Web search engine log data were analyzed by utilizing Batley's visual information types and two facets and seven sub-facets of query reformulation patterns. The results of this study are organized with two folds: query reformulation and categorical transition. As the most dominant categories of queries are specific and general/nameable, this tendency stays over various search stages. From the perspective of reformulation patterns, while the Parallel movement is the most dominant, there are slight differences depending on initial or preceding query categories. In examining categorical transitions, it was found that 60-80% of search queries were reformulated within the same categories of image attributes. These findings may be applied to practice and implementation of image retrieval systems in terms of assisting users' query term selection and effective thesauri development.