• Environmental and Resource Economics Review
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• v.19 no.3
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• pp.547-569
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• 2010

The purpose of this study is to estimate the benefits associated with the opportunities of multiple destination trips using a mixed logit model. The opportunities that affect the destination choice can be one of the external environments of recreational sites. The data for this study were taken from a survey conducted to the multiple destination trip participants at Seorak National Park in Korea. The results of the research show the specific values of complementary opportunities in the study area.

• Annual Conference of KIPS
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• 2014.11a
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• pp.283-286
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• 2014

본 논문에서는 스마트폰의 GPS기능과 기본적으로 안드로이드에 탑재되어 있는 Google Map을 이용하여 내 주변 학교 위치와 정보를 쉽게 검색할 수 있도록 한다. 이러한 어플리케이션 개발을 통해서 공공장소 및 목적지를 찾는 용도로 활용하고자 한다. 학교 시설은 입학시험, 각종 자격시험, 재난 시 대피소 등으로 활용되는 경우가 많다. 스마트폰을 능숙하게 사용하는 젊은 층이 아니라도 누구나 어려운 조작 없이 최단경로를 이용한 학교의 위치를 쉽게 찾아갈 수 있도록 도와주는 어플리케이션을 설계 및 개발한다.

• Annual Conference of KIPS
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• 2018.05a
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• pp.549-552
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• 2018

현재 흔히 사용하는 길찾기 앱은 대부분 2D 로 이루어져있어 초행길인 사람들이 길을 찾는 데 어려움이 있다. 특히 외국인들의 경우 길을 물어봐도 복잡한 길을 정확하게 알려주는 것은 한계가 있다. 따라서 본 논문에서는 외국인들에게 서울의 명소들을 카테고리 별로 나눠서 소개하고, 도보 길찾기와 대중교통 길찾기를 통합하여 제공하는 애플리케이션을 개발한다. 본 논문에서 개발한 애플리케이션은 특히 증강현실에 기반한 길찾기 서비스를 제공함으로써 외국인들이 도보 길을 보다 쉽게 찾아갈 수 있도록 한다. 본 논문에서 개발한 애플리케이션을 통해 외국인들은 서울의 유명관광지들을 보다 쉽고 빠르게 찾아갈 수 있으며, 목적지 주변의 시설들도 쉽게 파악할 수 있다.

• Journal of Digital Convergence
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• v.12 no.1
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• pp.339-345
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• 2014

This study has a purpose that improves efficiency of energy management and adaptation followed by movement of node better than the various early studied routing techniques. The purpose of this paper is the technique that uses RSSI value and location of sensor that is received by each sensor node to routing. This sduty does not save node information of 1-hop distance. And it solves energy-inefficient traffic problem that happens during data exchange process for middle node selection in close range multi hop transmission technique. The routing protocol technique that is proposed in this study selects a node relevant to the range of transmission which is set for RSSI value that is received by each node and selects the closest node as a middle node followed by location data. Therefore, it is for not exhaustion of node's energy by managing energy efficiently and cutting data transmission consuming until the destination node.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.11
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• pp.2205-2217
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• 2015

Bio-inspired routing protocol uses a principle of swarm intelligence, which finds the optimal path to the destination in a distributed and autonomous way in dynamic environments, so that it can maximize routing performances, reduce control overhead, and recover a path failure quickly according to the change of network topology. In this paper, we propose a bio-inspired routing protocol for mobile ad hoc networks. The proposed scheme uses a function of overhearing via wireless media in order to obtain the routing information without additional overhead. Through overhearing, the pheromone is diffused around the shortest path between the source and destination. Based on this diffused pheromone, a probabilistic path exploration is executed and the useful alternative routes between the source and destination are collected. Therefore, the proposed routing protocol can ensure the up-to-date routing information while reducing the control overhead. The simulation results show that the proposed scheme outperforms the typical AODV and AntHocNet protocols in terms of routing performances and significantly decreases the routing overhead against the AntHocNet.

• Journal of the HCI Society of Korea
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• v.8 no.2
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• pp.1-8
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• 2013

In previous study, we developed a guidance system outdoors for person with visual impairment to be able to walk safely to the destination. The volunteers are exposed to dangerous situations since they are performed to the experiments in the outdoors. In order to solve the problem, we propose an interactive application that monitors the volunteer wearing guidance system and warns remotely the volunteer about dangerous situations. The application is used to remote wireless communication with guidance system through Bluetooth module that is built in a laptop computer, without additional device. Therefore, we can monitor in real time user's location and guided contents to user, and it is possible to check a path to the destination and POI (Point of Interest) coordinate values. As using a proposed monitoring application, it is possible to perform safe experiment with the rapid situation awareness and fast detection of dangerous.

• Journal of KIISE
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• v.42 no.3
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• pp.295-306
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• 2015

MOnCa2 is a framework for building intelligent smartphone applications based on smartphone sensors and ontology reasoning. In previous studies, MOnCa determined and inferred user situations based on sensor values represented by ontology instances. When this approach is applied, recognizing user space information or objects in user surroundings is possible, whereas determining the user's physical context (travel behavior, travel destination) is impossible. In this paper, MOnCa2 is used to build recognition models for travel behavior and routes using smartphone sensors to analyze the user's physical context, infer basic context regarding the user's travel behavior and routes by adapting these models, and generate high-level context by applying ontology reasoning to the basic context for creating intelligent applications. This paper is focused on approaches that are able to recognize the user's travel behavior using smartphone accelerometers, predict personal routes and destinations using GPS signals, and infer high-level context by applying realization.

• Journal of Korean Society of Transportation
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• v.23 no.7 s.85
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• pp.99-110
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• 2005

Total travel cost of route which connects origin with destination (O-D) is consist of the total sum of link travel cost and route perception cost. If the link perception cost is different according to the origin and destination, optimal route search has limitation to reflect the actual condition by route enumeration problem. The purpose of this study is to propose optimal route searching formulation and algorithm which is enable to reflect different link perception cost by each route, not only avoid the enumeration problem between origin and destination. This method defines minimum unit of route as a link and finally compares routes using link unit costs. The proposed method considers the perception travel cost at both origin and destination in optimal route searching process, while conventional models refect the perception cost only at origin. However this two-way searching algorithm is still not able to guarantee optimum solution. To overcome this problem, this study proposed an orign based optimal route searching method which was developed based on destination based optimal perception route tree. This study investigates whether proposed numerical formulas and algorithms are able to reflect route perception behavior reflected the feature of origin and destination in a real traffic network by the example research including the diversity of route information for the surrounding area and the perception cost for the road hierarchy.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.3
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• pp.160-173
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• 2013

In this paper, we propose a new visual odometry technique by combining a forward-looking stereo camera and a backward-looking monocular camera. The main goal of the proposed technique is to identify the location of a moving vehicle which travels long distance and comes back to the initial position in urban road environments. While the vehicle is moving to the destination, a global 3D map is updated continuously by a stereo visual odometry technique using a graph theorem. Once the vehicle reaches the destination and begins to come back to the initial position, a map-based monocular visual odometry technqieu is used. To estimate the position of the returning vehicle accurately, 2D features in the backward-looking camera image and the global map are matched. In addition, we utilize the previous matching nodes to limit the search ranges of the next vehicle position in the global map. Through two navigation paths, we analyze the accuracy of the proposed method.

• Journal of Korea Multimedia Society
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• v.15 no.2
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• pp.281-289
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• 2012

The goal of our research is to develop more effective bus information system using user generated information and social tagging. In this research, we have developed a smartphone-based bus guide system using social tagging and awareness of location. It will guide users to the nearby bus stops and provides users with information about the bus lines at the bus stops. Information around bus-stops can also be registered as tags into the system by users and can be utilized for bus information service. Simple keyword search utilizing tagging information can provide users with bus information about destinations.