• 한국컴퓨터정보학회논문지
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• 제14권12호
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• pp.41-53
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• 2009

본 논문에서는 유비쿼터스 기술 기반의 지능형교통시설물 관리 서비스를 위한 비즈니스 모델과 이의 구현을 위한 시스템 구성방안 및 기술 요소들에 대하여 제안한다. 먼저 비즈니스 모델에서는 지능형교통시설물 관리의 서비스 기능과 구성, 그리고 비즈니스 프로세스 및 이해관계자들 간의 수요/공급 관계를 제시한다. 이와 함께, 비즈니스 모델 구현을 위한 시스템 구성방안을 제안한다 시스템 구성을 위해 필요한 네트워크, 인프라, 플랫폼의 관점에서 기술요소들을 살펴보고. 주요 기술들에 대한 비교 분석을 통해 교통시설물관리에 적절한 기술 구성방안을 함께 제시한다. 결론적으로, 본 연구를 통해 제안된 비즈니스 모델 및 기술 구현 방안은 지능형 교통시설물 관리를 위한 가이드라인을 제시한다.

• Journal of Communications and Networks
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• 제5권1호
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• pp.73-81
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• 2003

The controlled load service defined within the IETF's Integrated Services architecture for quality-of-service (QoS) in the Internet requires source nodes to regulate their traffic while the network, in combination with an admission control strategy, provides a guarantee of performance equivalent to that achieved in a lightly loaded network. Packets sent in violation of the traffic contract are marked so that the network may assign them a lower priority in the use of bandwidth and buffer resources. In this paper, we define the requirements of a scheduler serving packets belonging to the controlled load service and present a novel scheduler that exactly achieves these requirements. In this set of requirements, besides efficiency and throughput, we include an additional important requirement to bound the additional delay of unmarked packets caused due to the transmission of marked packets while dropping as few marked packets as possible. Without such a bound, unmarked packets that are in compliance with the traffic contract are not likely to experience delays consistent with that in al lightly loaded network. For any given desired bound ${\alpha}$ on this additional delay, we present the CL(${\alpha}$) scheduler which achieves the bound while also achieving a per-packet work complexity of O(1) with respect to the number of flows. We provide an analytical proof of these properties of the CL(${\alpha}$) scheduler, and we also verify this with simulation using real traces of video traffic. The scheduler presented here may be readily adapted for use in scheduling flows with multi-level priorities such as in some real-time video streams, as well as in other emerging service models of the Internet that mark packets to identify drop precedences.

• 한국IT서비스학회지
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• 제14권4호
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• pp.257-267
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• 2015

We propose a vehicle-mounted, location-aware mobile digital signage system that can be used for public transportation through mobile communication. This paper proposes the installations of the LED display panels at the backside of the bus., which display traffic information to cars behind the bus. Information to be displayed would include, but is not limited to, road information, public commercials and private commercials. We propose the system architecture and further implement the prototype of mobile digital signage system for demonstration. The system is based on the Client-Server system. Each bus has a client terminal which detects the current location by a GPS receiver and sends its location information to the server using mobile communication function. The terminal device receives advertisements and traffic information from the server and displays it to the large LCD or LED panel installed at the inside and outside of the bus. We use the Android smartphone as a client system, which inherently equipped with GPS and mobile communication function. GPS detects the location of bus and reports its geo-location data to the traffic information center server via a wireless communication network. On the server side, we developed a specially designed control server, where it communicates with the other traffic information center and updates and manages the databases contents being displayed by each position. The server contains location dependent variable information and returns selected information back to the vehicle in real time. Spatial database is used to process location based data. Server system periodically receives the real time traffic information from the road information center database. And it process the information by bus location and bus line number. In this paper, we propose a mobile digital signage service and explain the system implementation of this service.

• 환경영향평가
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• 제20권2호
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• pp.217-226
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• 2011

This paper was inspired by the fact that Real-time Traffic Information Service could play a key role in reducing incomplete combustion time remarkably since it can provide traffic jam information in real-time basis. Emission characteristics of experimental engines were studied with variable travel distances and speed of car in terms of traffic information provided. 12 Km distance road of Susung district in Daegu is taken as an experimental area to examine this new approach. The emission was tested while the driving was done at 8 AM, 3 PM, 6 PM which represents various traffic conditions. The reduced emission has been measured for a travel distance running at different loads (conventional shortest route and Real-time Traffic Information) and various loads (CO, VOC and NOx) are all inventoried and calculated in terms of existing emission factors. The emission has been shown to reduce linearly with travel distance : carbon monoxide (20.56%), VOC (29.21%), NOx(8.86%).

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.162-164
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• 2022

Efforts are being made to prevent traffic accidents within the child protection zone. Efforts are being made to prevent accidents by enacting safety facilities and laws to prevent traffic accidents in the school zone. However, traffic accidents in school zones continue to occur. If the driver can know the situation in the child protection zone in advance, accidents can be reduced. In this paper, we design a camera that eliminates blind spots in school zones and a number recognition camera system that can collect pre-traffic information. Design a LIDAR system that recognizes vehicle speed and pedestrians. Design an LED guidance system that delivers information to drivers without smart devices. We study time series analysis and artificial intelligence algorithms that collect and process pedestrian and vehicle information recognized by cameras and LIDAR. In the artificial intelligence traffic accident prevention system learned by deep learning, before entering the school zone, the school zone information is sent to the driver through the Force Push Service and the school zone information is delivered to the driver on the LED sign. try to reduce accidents.

• Journal of Information Processing Systems
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• 제10권4호
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• pp.568-580
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• 2014

To enhance the utilization of the traffic channels of a network (instead of allocating radio channel to an individual user), a channel or a group of channels are allocated to a user group. The idea behind this is the statistical distribution of traffic arrival rates and the service time for an individual user or a group of users. In this paper, we derive the blocking probability and throughput of a subscriber station of Worldwide Interoperability for Microwave Access (WiMAX) by considering both the connection level and packet-level traffic under a complete partition scheme. The main contribution of the paper is to incorporate the traffic shaping scheme onto the incoming turbulent traffic. Hence, we have also analyzed the impact of the drain rate of the buffer on the blocking probability and throughput.

• 한국통신학회논문지
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• 제30권6C호
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• pp.457-464
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• 2005

현재 표준화 작업이 한창인 휴대인터넷은 무선랜 보다 서비스 범위가 넓으면서 빠른 이동성을 제공하고 있다. 휴대인터넷 환경이 상용화 되면 많은 사용자들이 휴대인터넷을 사용할 것이며 무선 통신량 또한 급증할 것이다. 휴대인터넷에서 핸드오버가 발생했을 때 사용자에게 원활한 서비스를 제공하기위해 핸드오버 지연을 줄이는 것이 중요하다. IEEE 802.16e에서는 핸드오버 지연을 줄이기 위해 이동할 한 개의 기지국에게 단말기가 자신의 인증정보를 전송한다. 그러나 이것은 어느 기지국으로 이동할지 모르는 상황에서 적합하지 않다. 핸드오버 지연을 줄이기 위해 미리 인접한 기지국에 단말기의 인증정보를 보내는 proactive caching 기법은 [4]에 의해서 제안되었고 이 논문에서는 proactive caching 기법에 의해 발생되는 중복되는 네트워크 트래픽을 줄이기 위해 효과적인 트래픽 관리 알고리즘을 제안한다.

• 방송공학회논문지
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• 제12권3호
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• pp.203-213
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• 2007

지상파 DMB(Digital Multimedia Broadcasting)에서 비디오 서비스에 이어, 본격적인 데이터 서비스가 시작되고 있는데, 교통여행정보 서비스는 그 중에서도 핵심적인 데이터 서비스로 간주되고 있다. 본 논문은 교통여행정보 서비스를 제공하기 위한 방송시스템의 설계와 구현방안을 제안하기 위한 것이며, 전체 시스템은 저작 시스템, DB 시스템, 송출 시스템 및 모니터링 시스템으로 구성되어 있다. 구현한 시스템은 국내 지상파 DMB 교통여행정보 서비스 표준인 TPEG(Transfer Protocol Expert Group) 프레임을 따른다. 본 시스템은 실시간 혼잡교통정보(CTT), 혼잡교통정보(CTT SUM)를 비롯하여 다양한 비실시간 관심지점정보(POI), 안전운전정보(SDI) 등을 저작 및 자동 송출할 수 있도록 설계하였으며, 양질의 콘텐츠를 효율적으로 제작하고 제작한 콘텐츠를 비디오 및 오디오와 함께 안정적으로 송출하는데 중점을 두어 구현하였다. 구현한 시스템은 다양한 수신기와의 실내외 정합실험을 통하여 그 성능을 검증하였으며, 지속적인 업그레이드를 거쳐 현재 방송 서비스에 활용하고 있다.

• Journal of Information Processing Systems
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• 제17권5호
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• pp.989-1003
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• 2021

With the recent increase in the types of services provided by Internet companies, collection of various types of data has become a necessity. Data collectors corresponding to web services profit by collecting users' data indiscriminately and providing it to the associated services. However, the data provider remains unaware of the manner in which the data are collected and used. Furthermore, the data collector of a web service consumes web resources by generating a large amount of web traffic. This traffic can damage servers by causing service outages. In this study, we propose a website search engine that employs a system that controls user information using blockchains and builds its database based on the recorded information. The system is divided into three parts: a collection section that uses proxy, a management section that uses blockchains, and a search engine that uses a built-in database. This structure allows data sovereigns to manage their data more transparently. Search engines that use blockchains do not use internet bots, and instead use the data generated by user behavior. This avoids generation of traffic from internet bots and can, thereby, contribute to creating a better web ecosystem.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2022년도 춘계학술대회
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• pp.313-314
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• 2022

지능형 해상교통정보서비스(바다내비)는 선박에 설치한 LTE-Maritime 송수신기 및 AIS 등의 선박 장비로부터 육상 센터에 주기적으로 수집한 선박들의 위치 정보 기반으로 선박의 충돌·좌초 등을 예방할 수 있도록 실시간 예방 정보를 선박에 제공한다. 그러나 위 서비스는 선박의 위치를 측정하는 GPS 위치 정보가 LTE-Maritime 또는 AIS 망을 통해 전송되는 과정 중에 끊기거나 위치 튐 및 지연 등의 현상이 발생할 수 있어 선박 위치 정보의 신뢰성을 떨어드릴 수 있다. 본 연구는 확률에 기반한 최적 추정 필터인 칼만필터를 이용하여 기존 수신 위치정보를 기반으로 선박 위치 예측을 통해 비정상 구간에서도 어느 정도 신뢰성 있는 위치 정보를 추정하는 것을 목표로 한다.