• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2007.04a
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• pp.283-287
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• 2007

Pine Wilt Disease (Bursaphelenchus Xylophilus) has been attacked since 1988, then it becomes very serious problem of the all over the country. Government has been invested a lot of money to prevent but it is hard to survey the damaged area and ineffectively control the process of prevention. Therefore, this study is focused on development of Pine Wilt Disease (Bursaphelenchus Xylophilus) Prevention System using GIS and GPS through constructiong database of digital map, satellite imagery and attribute data and development component for desktop PC, internet and mobile system to realtime data transmission between project manager and field worker. Especially, we developed the mobile system that can transmit field conditions in realtime using GPS, GIS and CCD camera, the telecommunication control server that transmit received field condition data to web connecting module and system manager, the web system for end user to notify prevention details, the control system lot manager to recognize filed conditions and to control field workers and the wireless telecommunication module to connect in realtime between field and control center.

• Journal of Advanced Navigation Technology
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• v.12 no.4
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• pp.317-323
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• 2008

The technical progress of wireless communication in an information-oriented society is heading for the wireless internet service. Handphone is limited in a low capacity memory, size of screen, wireless internet. But it can do service in mobile, nontheless of the time, space. This paper says that online studying in wire internet is capable of servicing in mobile environment. The way of SMS transmission in the agency is linked in the SMS agency, but the way of SMS exclusive modem does service in linking with personal computer. This paper says that the SMS service is possible with SMS exclusive modem, mirroring of the client demand in database.

• Journal of Korea Spatial Information System Society
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• v.6 no.1 s.11
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• pp.59-71
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• 2004

Nearest neighbor query retrieves nearest located target objects, and is very frequently used in mobile environment. In this paper we propose a novel neatest neighbor query processing technique that is able to retrieve nearest located target object from the user who is continuously moving with a direction. The proposed method retrieves objects using the direction property of moving object as well as euclidean distance to target object. The proposed method is applicable to traffic information system, travel information system, and location-based recommendation system which require retrieving nearest located object.

• Proceedings of the Korea Database Society Conference
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• 2010.06a
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• pp.267-275
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• 2010

최근 모바일 기술이 지속적으로 발전해 감에 따라 모바일 통신 네트워크를 통한 방송서비스인 모바일 TV가 급속한 확산을 보이고 있다. 기존 모바일 TV 서비스를 대상으로 수행한 선행연구는 주로 모바일 TV 서비스 관련 기술 탐색, 최신 시장동향 분석, 서비스 수용 영향요인 등을 중심으로 연구가 활발히 진행되어 온 반면 서비스 수용 후 행동에 관하여 체계적인 분석을 수행한 연구는 부족한 것이 현실이다. 이러한 배경 하에서, 본 연구는 모바일 TV 서비스 이용자를 대상으로 해당 서비스에 대한 지속적 이용의도 형성에 중요한 영향을 미칠 것으로 예상되는 요인을 파악해 보는 것을 주목적으로 하였다. 연구목적을 효과적으로 달성하기 위하여 본 연구에서는 관련 문헌에 관한 종합적 고찰을 통해 모바일 TV 서비스의 채택 후 행동을 체계적으로 파악해 보기 위하여 지각된 놀이성, 기대 일치, 지각된 사용용이성, 지각된 유용성, 만족, 지속 이용 의도 등 여섯 가지 차원을 포함한 연구모델을 제안하였다. 그리고 제안된 연구모델에 포함된 각 요인들 간의 영향관계에 관한 연구가설을 수립하였다. 향후 모바일 TV 이용자를 대상으로 설문조사를 수행하고, 제안된 모델 및 가설에 대한 실증적 분석을 실시해 보고자 한다. 본 연구의 결과를 토대로 최근 사용자 수가 급증하고 있으며, 높은 관심의 대상이 되고 있는 모바일 TV 분야의 연구자 및 실무자들에게 서비스 이용자를 장기적으로 유지하고, 이를 토대로 지속적인 수익을 창출하는데 도움을 줄 수 있는 시사점을 제공해 보고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.2
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• pp.77-85
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• 2015

This paper presents our performance evaluation after the way of minimizing waiting times between channel switching for eMBMS(evolved Multimedia Broadcast/Multicast Services) technique in LTE-Advanced systems. Existing composition of MBMS using IGMP(Internet Group Management Protocol) transfers the data with Multicast from BM-SC(Broadcast Multicast Service Center) to eNB(evolevd Node B) and with Broadcast from eNB to UE(User Equipment). Therefore, in case of channel switching, IGMP Join report should be transferred to BM-SC and then wait user's contents to be retransferred from eNB. To achieve this, Subscriber Channel technique of priorities is used for minimizing waiting times between channel switching as UE broadcasts favorite channels in advance.

• Journal of the Korea Society of Computer and Information
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• v.21 no.7
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• pp.23-30
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• 2016

In this paper, we propose a portable art therapy content. The proposed content makes counseling clients get a psychical cure at least cost regardless of time and place Counseling clients express their psychological state as pictures through the proposed content. And Counselors analyze and interpret the figures based on the database which is built into the server system. Due to the development of advanced technologies, various adjustment disorders and addictions have increased in the rapidly changing modern society. This causes the increase of counseling clients who want a psychical cure. And also counseling time, counseling place and counseling cost are emerging as a social issues. Psychotherapy specialists use the proposed content at the stage of the psychoanalysis which needs a lot of time and effort. The proposed content exploits the sever system to make the right decisions quickly and accurately. Counseling clients who are the medical underprivileged get visit consultation and online consultation can detect a psychological high-risk in an early stage and prevent this psychological high-risk. Preventive treatment service using the proposed content will make the social and medical cost savings.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.366-372
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• 2007

In this research, a ubiquitous-based strategy for managing waterworks facilities is proposed to increase the usability of the existing related databases and to ensure the systematic way of distributing information. The current status of the existing waterworks GIS and GIS database were analyzed to achieve the goal. By studying the state-of-the-art technology, we found that importing the LBS(Location Based Service) technology to the databases is necessary. The results of these efforts are exclusive waterworks-mobile-terminals and LBS system supporting them. Furthermore, the applicability of the ubiquitous technology to waterworks has been examined to realize the real-time waterworks management.

• Journal of Information Processing Systems
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• v.4 no.1
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• pp.9-16
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• 2008

This paper describes the design and implementation of a two-tier DBMS for handling massive data and providing faster response time. In the present day, the main requirements of DBMS are figured out using two aspects. The first is handling large amounts of data. And the second is providing fast response time. But in fact, Traditional DBMS cannot fulfill both the requirements. The disk-oriented DBMS can handle massive data but the response time is relatively slower than the memory-resident DBMS. On the other hand, the memory-resident DBMS can provide fast response time but they have original restrictions of database size. In this paper, to meet the requirements of handling large volumes of data and providing fast response time, a two-tier DBMS is proposed. The cold-data which does not require fast response times are managed by disk storage manager, and the hot-data which require fast response time among the large volumes of data are handled by memory storage manager as snapshots. As a result, the proposed system performs significantly better than disk-oriented DBMS with an added advantage to manage massive data at the same time.

• Journal of Positioning, Navigation, and Timing
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• v.11 no.4
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• pp.361-368
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• 2022

An indoor navigation system that utilizes long-term evolution (LTE) signals has the benefit of no additional infrastructure installation expenses and low base station database management costs. Among the LTE signal measurements, received signal strength (RSS) is particularly appealing because it can be easily obtained with mobile devices. Propagation channel models can be used to estimate the position of mobile devices with RSS. However, conventional channel models have a shortcoming in that they do not discriminate between line-of-sight (LOS) and non-line-of-sight (NLOS) conditions of the received signal. Accordingly, a previous study has suggested separated LOS and NLOS channel models. However, a method for determining LOS and NLOS conditions was not devised. In this study, a machine learning-based LOS/NLOS classification method using RSS measurements is developed. We suggest several machine-learning features and evaluate various machine-learning algorithms. As an indoor experimental result, up to 87.5% classification accuracy was achieved with an ensemble algorithm. Furthermore, the range estimation accuracy with an average error of 13.54 m was demonstrated, which is a 25.3% improvement over the conventional channel model.

• International conference on construction engineering and project management
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• 2011.02a
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• pp.221-228
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• 2011

As construction works have become larger and more complex, improving productivity by introducing Information Technology (IT) is pursued and more effective construction management is needed in construction industry. In this circumstance, many different kinds of project management system is being introduced, and various IT technologies are applied such as Personal Digital Assistant (PDA), Bar Code, Radio Frequency Identification (RFID), Web Camera, and so on. However, these kinds of technologies might cause re-processing of information and ineffectiveness of project because of lack of real time information processing technology or separation between construction sites and management offices. Meanwhile, these technologies rather decrease the construction productivity except for the data saving and database function. Therefore, this research aims to develop Application that can be applied efficiently for construction material management, by understanding problems of former management system with questionnaires and extracting functions with analysis of requirements. In virtue of the construction material management Application which will be developed in this study, it will be possible to input information automatically, to process and check material information in real time, and to identify the location of necessary material. Then, the problem of separation between construction sites and management offices are solved, and as a result, more efficient management of materials in construction sites will become possible. At the same time, this study will investigate the possibility and applicability of new IT device, Smart Phone to construction sites.