• Journal of Korea Society of Digital Industry and Information Management
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• v.6 no.3
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• pp.1-8
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• 2010

Recently, the missing due to the heinous crimes occurred in succession has been the focus of attention, so measures for these are urgently needed. So, it is necessary that we need to check and take care the weak like children, women, the elderly with dementia and insane person to prevent these social problems. This study is location-based service that suggests the tracking system and way to guard a family and property from the various risk factors which are possible in our life. To acquire the location of the user who is in motion, a communications network technologies were integrated and the system will be able to be monitoring in real time through the website. So, it is convenient and safe because it is possible to use anywhere. Concretely, it was described around location-based service, GPS system, tracking system, process of the service solution and composition for the system. Also, the way to activate the system will be suggested. The final suggested system was verified the possibility through the placement. With this, i will offer effective measures which is more convenient to use and reliable.

• Journal of Auto-vehicle Safety Association
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• v.12 no.2
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• pp.33-39
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• 2020

This paper presents an Around View Monitoring (AVM) stop-line detection based longitudinal position correction algorithm for automated driving on urban roads. Poor positioning accuracy of low-cost GPS has many problems for precise path tracking. Therefore, this study aims to improve the longitudinal positioning accuracy of low-cost GPS. The algorithm has three main processes. The first process is a stop-line detection. In this process, the stop-line is detected using Hough Transform from the AVM camera. The second process is a map matching. In the map matching process, to find the corrected vehicle position, the detected line is matched to the stop-line of the HD map using the Iterative Closest Point (ICP) method. Third, longitudinal position of low-cost GPS is updated using a corrected vehicle position with Kalman Filter. The proposed algorithm is implemented in the Robot Operating System (ROS) environment and verified on the actual urban road driving data. Compared to low-cost GPS only, Test results show the longitudinal localization performance was improved.

• KIPS Transactions on Computer and Communication Systems
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• v.2 no.12
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• pp.525-532
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• 2013

Recently smartphones, tablet, etc. Various types of smart terminal is due to the increased security in mobile devices are becoming an issue. How to enter the password in this environment is a very important issue. Difficult to have a secure password input device on various types of mobile devices. In addition you enter on the touch screen the password of character, uncomfortable and it is vulnerable to SSA attack. Therefore, in this paper provide for defense the SSA(Shoulder Surfing Attacks) and useful password input mechanism is proposed with Smartphone GPS uses a value generated via a graphical password techniques.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.12
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• pp.2737-2746
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• 2010

Recently, Logistics industry has emerged a new u-logistics paradigm combines USN / RFID technology. In this paper offers a vehicle history Web-based logistics management system based on the u-logistics paradigm. The design of this system is considered all events processes as a form of recycling and entire system is to modeling based UML of object oriented. Also It was undergone some process to make sure by logistics vehicles identified that RFID based was identified vehicle logistics. To identify logistics vehicle based RFID, identified the logistics vehicles is a process that will determine. The implementation method designed the interface based web which uses in the manager to C/S methods, consideration of the mobility of the system user implements the user GUI based PDA. As well as, In this paper was separated customer, manufacturer, distributor, administrator, drivers, respectively and focuses to raise a system reusability which is implementation by separately for each feature.

• Journal of Korean Society of Transportation
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• v.24 no.3 s.89
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• pp.17-27
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• 2006

Car following model is a theory that examines changes of condition and interrelationship of acceleration deceleration. headway, velocity and so on closely based on the hypothesis that the Posterior vehicle always follows the preceding vehicle. Car following mode) which is one of the research fields of microscopic traffic flow was first introduced in 1950s and was in active progress in 1960s. However, due to the limitation of data gathering the research depression was prominent for quite a while and then soon was able to tune back on track with development in global positioning system using satellite and generalization of computer use. Recently, there has been many research studies using reception materials of global Positioning system(GPS). Introducing GPS technology to traffic has made real time tracking of a vehicle position possible. Position information is sequential in terms of time and simultaneous measurement of several vehicles in continuous driving is also practicable. Above research was focused on judging whether it is feasible to overcome the following model research by adopting the GPS reception device that was restrictively proceeded due to the limitation of data gathering. For practical judgment, we measured the accuracy and confidence level of the GPS reception devices material by carrying out a practical experiment. Car following model is also being applied in simulations of traffic flow analysis, but due to the difficulty of estimating parameters the basis of the above result. it is our goal to produce an accurate calibration of car following model's parameters that is suitable in this domestic actuality.

• Journal of Energy Engineering
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• v.20 no.4
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• pp.353-357
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• 2011

An embedded two-axis solar tracking system was developed by using AVR micro controller for enhancing solar energy utilization. The system consists of an Atmega128 micro controller, two step motors, two step drive modules, CdS sensors, GPS module and other accessories needed for functional stability. This system is controlled by both an astronomical method and an optical method. Initial operation is performed by the result from the astronomical method, which is followed by the fine controlled operation using the signals from Cds sensors. The GPS sensor generates UTC, longitude and latitude data where the solar tracker is installed. A database of solar altitude, azimuth, and sunrise and sunset times is provided by UART (Universal Asynchronous Receiver/Transmitter).

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.422-424
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• 2010

Recently the car attached many ECUs and entertainment devices to provide the easiness maintenance and driver's convenience. CAN and MOST networks have been used to manage and control those devices in the car. Wireless network also has been established to receive information from external. These days a car navigation system with GPS is being integrated with CAN, MOST and Wireless network. In these circumstances, the car navigation system can have HMI function to integrate and control the car networks' devices. To solve the GPS problems such as positioning errors or losing signals from satellites in the tunnels and urban canyons, this paper designs and implements a method for positioning vehicle by using the sensing data of sensors and Wi-Fi devices based on this integrated environment.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.5
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• pp.483-489
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• 2015

In this paper, we propose monocular visual simultaneous localization and mapping (SLAM) in the large-scale environment. The proposed method continuously computes the current 6-DoF camera pose and 3D landmarks position from video input. The proposed method successfully builds consistent maps from challenging outdoor sequences using a monocular camera as the only sensor. By using a binary descriptor and metric-topological mapping, the system demonstrates real-time performance on a large-scale outdoor dataset without utilizing GPUs or reducing input image size. The effectiveness of the proposed method is demonstrated on various challenging video sequences.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.6
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• pp.133-138
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• 2019

Recently, SNS is one of the most prominent areas and AR is a technology in the spotlight. In this paper, AR technology is applied to SNS to provide community functions and we develop the related technologies. The system developed in this paper provides differentiated communication among users by providing community functions applying location information and AR such as displaying AR message and finding a path using AR in current location. In addition, this paper presents a method of using the existing map APIs considering their characteristics as a method to obtain map information essential for the implementation of location-based AR.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.137-140
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• 2004

최근 모바일 기기의 보급이 증가되고, 고급 어플리케이션의 동작이 가능해지는 등 모바일 장비의 사용 편이성이 급속도로 증가되고 있다. 또한 GPS 기술의 발전으로 인해 위치 기반 서비스가 여러 분야에서 널리 사용되고 있다. 본 논문에서는 고정된 노선을 이동하는 버스를 대상으로 목적지까지의 최단 시간 경로를 제공하는 교통 정보 시스템을 제안한다. 이를 위해 우선, 이동 객체인 버스와 관련된 정보를 효율적으로 저장, 관리, 검색할 수 있는 스키마와 질의 모델을 제안한다. 또한, 제안된 시스템에서는 최단 시간 경로를 위해 버스의 노선 정보 및 위치 정보, 정류장간 소요 시간 정보, 사용자의 근접 정류장까지의 이동 시간, 사용자의 도보 이동 시간 등의 정보를 활용한다. 대부분의 위치기반 서비스를 위한 시공간데이터베이스 기술에서는 이동 객체가 시간의 흐름에 따라 속도와 방향의 변화로 인한 임의의 동선으로 움직인다고 가정하고 있으며, 버스와 같이 고정된 노선을 이동하는 이동 객체의 관리 기법은 다루어지지 않고 있다. 따라서 본 논문의 연구 결과는 고정된 노선을 이동하는 이동 객체의 저장 및 이동 객체의 미래 위치 예측 기법에 활용될 수 있다.