• Proceedings of the Korea Information Processing Society Conference
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• 2003.05c
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• pp.1575-1578
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• 2003

이동통신 기술의 발달로 인하여 무선 이동 기기의 사용이 보편화되면서 LBS(Location Based System)의 요구가 나날이 증대되고 있다. 이와 같은 위치 기반 서비스에서 클라이언트인 이동체들은 일정한 보고 주기를 가지고 서버에 위치 데이터를 보고하게 되는데, 빈번한 보고 데이터를 실시간으로 처리하기 위해서 서버에서는 메인 메모리 DBMS를 유지하는 것이 필요하다. 기존에 제시된 메인 메모리 색인으로는 T-tree 가 있는데, 이는 1차원 데이터를 위한 것이므로 이동체 데이터베이스 환경에 적합하지 못하다. 그리고, 디스크 기반의 다차원 색인으로는 R-tree 계열이 있는데, 이는 메인 메모리에서 효율적인 사용을 보장하지 못한다. 이 논문에서는 이동체 데이터베이스 환경에 적합한 메인 메모리 색인을 고려함에 있어서, 기존의 디스크 기반의 다차원 색인으로 가장 널리 알려진 R-tree 계열의 색인을 메인 메모리에 적재 후 메인 메모리 환경에서 성능에 영향을 주는 요소를 실험을 통하여 제시한다. 실험은 메인 메모리에서는 간단한 알고리즘을 사용하는 것이 성능에 좋고, 삽입 시에는 삽입할 노드를 찾기 위해서 비교하는 엔트리의 수가, 검색 시에는 노드간의 중첩으로 인하여 비교하는 노드의 수와 엔트리의 수가 성능에 영향을 주는 요소임을 보여준다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.753-756
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• 2014

기존의 웹 지도 서비스는 방문 횟수가 많은 장소를 알기 어렵고, 사용자에게 여행 경로를 추천하는 기능 또한 찾기 어려웠다. 따라서 본 논문에서는 사진 촬영 분포를 기반으로 한 여행 경로 추천 시스템을 제안한다. 사진이 많이 촬영된 곳이 여행객이 많이 방문한 곳이며, 유명한 장소일 것이라고 가정하여 사진 촬영 분포를 기반으로 여행 경로를 추천하고자 한다. 여행 경로를 추천하기 위해 사진 데이터의 위치 값을 수집하고, 사진 데이터의 위치 값을 기반으로 사진 촬영 분포를 시각화하여 지도 위에 나타낸다. 또한, 여행 지역 내 사진이 많이 촬영된 장소를 유명한 장소로 선정하여 이를 경유하는 여행 경로를 추천한다. 사용자는 시스템을 통해 유명한 장소를 쉽게 인식할 수 있고, 편리하게 여행 경로를 계획할 수 있다.

• Journal of the Korea Society of Computer and Information
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• v.14 no.8
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• pp.43-50
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• 2009

Text information in a digital video provides crucial information to acquire semantic information of the video. In the proposed method. text candidate regions are extracted from input sequence by using characteristics of stroke and text candidate regions are localized by using projection to produce text bounding boxes. Bounding boxes containing text regions are verified geometrically and each bounding box existing same location is tracked by calculating matching measure. which is defined as the mean of absolute difference between bounding boxes in the current frame and previous frames. Finally. text regions are enhanced using temporal redundancy of bounding boxes to produce final results. Experimental results for various videos show the validity of the proposed method.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.258-259
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• 2021

Forest lodge are divided into forest resources, auxiliary facilities, and users, and are constantly being used along with well-being culture. In addition, attention to the safety of users is also required, and this study aims to study how users evacuate within a short time (golden time) in situations of natural disasters that may occur in forests. In order to search for the current location of the user and find the best evacuation route, 3D scans of the entire forest lodge(forest resources, auxiliary facilities, etc.) are performed, and the optimal trajectory to the evacuation site is found through recognition of the current location. It is believed that it is possible to provide a quick evacuation guide through a mobile device with gps.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.5D
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• pp.619-625
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• 2009

Test constructions were performed at 3 sites to investigate ways for maximizing performance of geogrid-reinforced asphalt pavements known to reduce reflection cracking and rutting. Problems during construction operation which can affect bonding shear strength of the geogrid-reinforced asphalt pavements were defined and the construction conditions were intentionally made during the test constructions. Both immediately and 1year after the test constructions, cores were obtained from positions with good and bad construction conditions and then bonding shear strength tests were performed to be compared each other. Rules to be kept at construction sites were suggested to improve performance of the geogrid-reinforced asphalt pavements.

• Journal of Internet Computing and Services
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• v.12 no.4
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• pp.173-180
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• 2011

Various smart-phone applications for location-based service are enabled through mobile communications such as 3G and WiFi. We have developed MARS, an advanced location-based route-search application based on the Android platform. It provides three functions: route-registration, route-search, and route-evaluation. These functions are dynamically maintained by a web server, a database server, and user mobile terminals. As users can update location information using their smart-phone devices, servers provide the information and allow users to add, modify, and remove their own information as well as adding comments to others, while existing map services do not support direct inputs from users. We show our implementation process and demonstration of its operations. We also show the comparison results with existing services. Through these results, we can confirm that MARS can achieve better performance.

• The KIPS Transactions:PartD
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• v.8D no.2
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• pp.125-131
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• 2001

Various kind of disasters happens in our society. Most of them require immediate treatment to save life or to protect valuable products. When an accident happens in a place, it is reported to the headquarter of emergency measures system. According to the nature of accident several treatments orders are transmitted to the related authorities. In this paper, we introduce an intelligent emergency measures system that uses trigger mechanism of active databases. The system responds to various events spontaneously without intervention of mankind by triggering proper rules. The most important part of an action in the system is the capability of searching places to apply adequate treatments quickly. We have developed a new method for range queries and nearest neighbor queries which utilize the z-ordering technique to get fast responses. Those new methods are further extended to handle more realistic actual distance of road among positions.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.655-656
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• 2018

In the 21st century, smart phones have become indispensable items in everyday life. Users get various information from smartphone, and location information such as map is one of them. It is a matter of course that there is a high need for an app that displays information about the user in detail on a smartphone that always carried around wherever it goes. However, in many cases, the current map or navigation is not suitable for selecting only the desired information group. In this project, I want to develop it with Android studio so that make users to get the information of the area easily and quickly in daily life. And it is designed to make it more convenient for users by creating a server with raspberry pie.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.39 no.1
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• pp.24-32
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• 2002

This paper is concerned with the fault diagnosis for stuck-at faults of a multistage interconnection network(MIM) which is a kind of interconnection networks in multicomputer systems. Up to the present, a fault diagnosis scheme has dealt with a fault model of all types, which results in complicated algorithms. In the literature, it is shown that a number of steps and computation are required for the fault detection and isolation algorithms for a class of MINs. In this paper, we propose a simple and easily implementable algorithm for the detection and isolation of the stuck-at fault in MIM. specifically, we develope an at algorithm for the isolation of the source fault in switching elements whenever tile stuck-at fault is detected in MINs. After all, the proposed algorithm is illustrated by an example of 16$\times$16 baseline networks of MINs.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.42 no.4
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• pp.750-757
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• 2017

Recently, mobile internet traffic has rapidly increased as the huge increase of the smart phone and mobile devices. D2D get attention, because D2D is known that it reduce the traffic load of the base station and also improves the reliability of the network performance. However, D2D has a problem that the efficiency decreases as interference is increased. In this paper, we propose a resource allocation scheme to use the resources efficiently when the D2D link share the cellular resources in the cellular network based the uplink. D2D communication utilizes the location information for allocating resources when the eNB know the location of all devices. The proposed scheme select some cellular user using location informations in order to ensure performance of the D2D communication. and D2D link choose cellular user that performs resource allocation using only selected cellular user. Simulation results show optimal value of resource selection in order to ensure most performance of the D2D communication.