• Information and Communications Magazine
• /
• 제34권6호
• /
• pp.11-19
• /
• 2017

V2X(Vehicle to Everything)는 차량 간 통신(Vehicle-to-Vehicle), 차량과 인프라 간 통신(Vehicle-to-Infrastructure), 차량과 보행자 간의 통신(Vehicle-to-Pedestrians) 등 운전 중 도로 인프라 및 다른 차량과 통신하면서 교통상황 등의 정보를 교환하거나 공유하는 기술을 말한다. V2X는 IT 기술의 발달과 여러 연구기관들의 연구개발 강화로 인해 'Connected/Smart car' 나아가 완전한 자율주행차를 구현하기 위해 빠르게 진화하고 있다. 이러한 V2X 시장이 향후 10년 간 급속한 확대가 전망되면서, 국내외 통신업체와 제조업 및 산학연은 자동차와 정보통신, 에너지, 서비스 산업을 융합한 스마트자동차 산업을 신성장 동력으로 하여 기술개발에 노력을 가속화하고 있다. 이에 본고에서는 V2X 차량 통신 기술의 주요선진국 기술개발 동향과 현 수준을 알아본다.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• 제10권5호
• /
• pp.167-172
• /
• 2010

This paper is to implement HSDPA-CPE that can provides WiFi terminal with wireless Internet service through the connection to HSDPA wireless network. This system aims to support HSDPA interface in upstream, and WiFi and 100Mbps Ethernet interface in downstream. So, this system can provide multiple Internet customers with wireless Internet service by using WiFi terminal in subway, car, ship, and so on, and WiFi terminals that be registered in HSDPA service can be connected to Internet.

• Proceedings of the KIEE Conference
• /
• 대한전기학회 1989년도 하계종합학술대회 논문집
• /
• pp.211-215
• /
• 1989

The structure of A matrix of one machine connected to the infinite bus is described for a full model. The A matrix can be partitioned to submatrices which depend on the initial operating point and do not depend on it. When the dynamic properties for several different operating points are desired, those submatrices can be obtained through simple column operations. Furthermore, the elements of A matrix car be directly calculated from the manufacturer's data. RMS quantities of the state variables for the initial operating point are used. This approach can save the labor for calculating the elements of A matrix for the dynamic stability analysis.

• Proceedings of the KSR Conference
• /
• 한국철도학회 2007년도 추계학술대회 논문집
• /
• pp.843-851
• /
• 2007

It is known that bogie frame must have sufficient stiffness for car body and passenger weight and transfer traction and braking force, and as of today most studies and verifications are restricted to static and fatigue analysis for force acted on bogie frame. Bogie frame is mounted with equipments to control the signal, traction and so on, this equipment's behavior is subjected to vibration mode occurs on running condition. If the resonance occurs on this equipment, the possibility of crack occurrence on bracket connected with equipment and bogie frame will be increased. In this paper, the method of vibration strength verification for bracket attached on bogie frame will be introduced by using frequency response method.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 한국소음진동공학회 2014년도 추계학술대회 논문집
• /
• pp.622-624
• /
• 2014

A maglev train records a host of physical variables such as gaps, voltages and currents for suspension control and monitoring purposes. These data available from a maglev contains wealth of information that can be explored for various uses. One possible of such application is to use the gap data to estimate the shape of the rail, especially at the joints where rails are connected. The eddy current sensors that measure the gap between the rail and the car body produce large peaks around the joints. The suspension controller discards these peaks. Since the shape of the peaks is related to the joint, however, these peaks can be utilized to estimate the shape of the joints. In this paper, we present preliminary results on estimating the joint shape using the peak data. The results show that the approach is promising, albeit several technical difficulties to overcome.

• Proceedings of the KSR Conference
• /
• 한국철도학회 2008년도 춘계학술대회 논문집
• /
• pp.122-127
• /
• 2008

General bus stop is very simple and have some problem to protect the passengers and don't have any proper information messenger for the convenience of bus riding in spite of present initiative bus information system. However, this paper have introduced new conceptual modular-smart station avaliable to both public bus and bimodal tram. It can secure the passenger's safety from other danger attributes like running car or unexpected natural disaster and supply the passengers the variable information from display which is connected to the control center. Therefore, modular-smart station is both shelter and information messenger for passenger's safey and convenience.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• 제16권6호
• /
• pp.29-34
• /
• 2017

This study analyzed automobile lower arm assembly structure and fatigue to identify configuration changes to enhance structural safety. Parts connected to the car body were fixed and 500 N load was applied at the lower arm head. Maximum equivalent stress and maximum total deformation were minimized for model 1 ( MPa and 0.10315 mm, respectively). Fatigue analysis using extreme SAE bracket history fatigue loads showed model 1 also improved fatigue life ($3.3693{\times}10^5cycles$). This study provides important inputs to improve lower arm durability by modifying the arm configuration.

• Journal of the Korean Society of Mechanical Technology
• /
• 제13권4호
• /
• pp.137-141
• /
• 2011

Driving mechanism, the central part of a robot, was designed in this study. Power for the motive drive was acquired by directly connecting the motor shaft in worm shape of the low-end DC motor, car window motor, to a decelerator. The decelerator consists of a worm gear to receive power from the motor shaft, a pinion gear to be connected in line with the worm gear, and an output shaft to be engaged to the pinion gear. Motion driving is achieved by the power from the motor shaft with the designed gears, transferred to the deceleration mechanism and to the output gear.

• Journal of the Korea Society of Computer and Information
• /
• 제18권9호
• /
• pp.21-31
• /
• 2013

ECU(Electric Control Unit) on the important features of the vehicle is equipped, ECU between sending and receiving messages is connected to one of the internal network(CAN BUS), but this network easily accessible from the outside and not intended to be able to receive attacks from an attacker, In this regard, the development of tools that can be used in order to verify the possibility of attacks on attacks from outside, However, the time costs incurred for developing tools and time to analyze from actual car for CAN messages to be used in the attack to find. In this paper, we want to solve it, propose a method to generate test cases required for the attack is publicly available tool called Sulley and it explains how to find the CAN messages to be used in the attack. Sulley add the CAN messages data generated library files in provided library file and than Sulley execute that make define and execute file conform to the CAN communication preferences and create message rules. Experiments performed by the proposed methodology is applied to the actual car and result, test cases generated by the CAN messages fuzzing through Sulley send in the car and as a result without a separate tool developed was operating the car.

• Journal of the Institute of Electronics and Information Engineers
• /
• 제53권4호
• /
• pp.27-34
• /
• 2016

In the train system, railway vehicles are connected in a line. Therefore, this feature should be considered in composing network topology in a train system. Besides, inter-car communication should be distinguished from in-car communication. As for the inter-car communication, the hybrid topology was proposed to use rather than the conventional ring, star, daisy-chain, and bus topologies. In the hybrid topology, a number of cars are bound to be a group. Then star topology is used for the communication in a group and daisy-chain topology is used for the communication between groups. Hybrid topology takes the virtue of both star and daisy-chain topologies. Hence it maintains communication speed with reducing the number of connecting cables between cars. Therefore, it is important to choose the number of cars in a group to obtain higher performance. In this paper, we focus on the optimization of hybrid topology for railway cars. We first assume that the size of data and the frequency of data production for each car is identical. We also assume that the importance for the maximum number of cables to connect cars is variable as well as the importance of the communication speed. Separated weights are granted to both importance and we derive the optimum number of cars in a group for various number of cars and weights.