• Journal of the Korea Institute of Military Science and Technology
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• v.16 no.4
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• pp.422-429
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• 2013

MIL-STD-1553B communication is globally used in the area of aerospace and defense which require safety and reliability in spite of its low communication speed. As recently increased requirements for high precision and robust guidance ability of missiles, missile sensor equipment needs more data to satisfy those requirements. Therefore, missile systems to adopt MIL-STD-1553B requires higher data transfer and processing capability than those of the current systems. In this paper, we describe the result of analysis and implementation of the existing methods that applied multi-message chain and double buffers to improve the current missile system.

• International Journal of Contents
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• v.13 no.2
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• pp.50-56
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• 2017

The number of accidents in school zone is decreasing than before with the introduction of strengthening traffic safety policy since January 2011, but the danger still exists. The School zone sign is widely known to have much effect in protecting children from risks of traffic accidents, but design improvement is being demanded to improve a sense of safety and legibility of safety signs in School zone due to the lack of understanding on the safety signs in crosswalk and School zone. This study analyzed differences in shape and color of existing safety signs through a case analysis of traffic developed countries as America, England, Japan, and Germany and suggested improvement plans for drivers to clearly perceive the school zone. For improvement methods, this study suggested the importance of delivering definite and unified warning message for school zone to drivers by using indication sign and caution sign together, and to use yellow, a safety color, and to unify the safety sign into triangle shape that symbolizes warning and caution to conform the international standards. Actual design production and experiment through improvement plans are needed in the future, and it is expected to secure safety of children and to provide international standardization of safety signs in school zone.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.17 no.1
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• pp.89-99
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• 2018

The number of traffic accidents in Korea has been increasing since 2014. In most school zones, safety signs are installed to prevent children's traffic accidents. However, it has been known that the effects of those signs are not significant. A variable message sign(VMS), one of the components of Intelligent Transport System(ITS), has emerged as an alternative method. Therefore, this study examines relative effects of two different VMS messages(Timely vs. Continuous) on vehicle speed. Experiments were conducted in two school zones. 6,676 vehicles were measured for speed limit compliance. A counterbalanced multiple baseline design was adopted. The results showed that both types of message are effective in reducing the speed of vehicle. Specifically, A timely message was more effective in slowing down vehicle speed and improving speed limit compliance than a continuous message. The present study suggested that a VMS with human factors can be effective.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.6
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• pp.284-298
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• 2022

It is necessary to acquire information on traffic safety facilities installed on the roadways specifically for the operation of autonomous vehicles. The purpose of this study is to prepare a Korean version of an integrated message-set design as a way to provide to autonomous vehicles standardized information on traffic safety facilities. In this study, necessary facilities are classified according to four criteria (no legal basis; not providing information to autonomous vehicles; providing duplicate information; not standardized, and too difficult to generalize) based on information that must be provided to operate autonomous vehicles. The priority of information delivery (gross negligence followed by behavior change) was classified according to the importance of the information to be provided during autonomous driving, and the form was defined for the classification code in the information delivered. Finally, the information location and delivery method of traffic facilities for compliance with SAE J2735 were identified. This study is meaningful in that it provides a plan for roadway operations by suggesting a method for providing information to autonomously driven vehicles.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.717-720
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• 2000

Event-driven communication protocols such as CAN(Controller Area Network) have inherent packet delays due to the contention process for the use of network medium. These delays are stochastic in nature because most packets arrive at random time instants. The stochastic property of the delay adversely influences the control system's performance in terms of stability, responsiveness and steady-state error. Another problem for safety-critical application such as brake-by-wire systems is the reliability of the communication modules that can fail abruptly. This paper deals with two methods to overcome the above problems : (i) scheduling method that can maintain packet delays under some acceptable level, and (ii) redundancy management of communication modules that prescribes dual-redundancy modules' behavior when one of them fails.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.428-431
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• 2012

본 연구에서는 터널 화재 시 보다나은 대피 안전성확보를 위해 2차적 사고예방에 목적을 둔 정보표지판(Variable Message Sign)을 제연막으로 활용함으로써 터널 대피자의 안전성을 확보하고 대피취약자로 하여금 충분한 대피시간의 확보를 위한 최적의 조건을 제시하고자 하였다. 정보표지판의 다양한 설치 조건에 따라 화재연기가 전파되어지는 거리를 화재 시뮬레이션인 FLUENT와 피난 시뮬레이션인 SIMULEX를 이용하여 통근자와 고령자의 안전거리를 비교하고 대피 안전성을 검토하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.177-178
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• 2018

키보드 정보가 노출되는 취약점이 발견되면서 키보드를 통하여 아이디 및 비밀번호를 입력하는 인증의 보안성 결여 문제가 대두되었다. 이를 대응하기 위하여 마우스를 통하여 비밀번호를 입력하는 이미지 기반 인증이 등장하였으며, 이 인증방식은 인터넷 뱅킹 및 결제 서비스와 같이 중요도가 높은 서비스에 도입되어 사용자가 입력하는 비밀번호를 안전하게 보호한다. 하지만 키보드와 동일하게 사용자가 입력하는 마우스 데이터가 노출되는 취약점이 발견되고 있으며, 본 논문에서는 WM_INPUT 메시지를 활용하여 노출되는 마우스 데이터를 보호하는 방안을 제시한다. 제시하는 방안은 WM_INPUT 메시지를 활용하는 공격을 효과적으로 방지하며, 이를 통하여 이미지 기반 인증방식의 안전성을 강화할 수 있을 것으로 사료된다.

• International Journal of Railway
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• v.3 no.3
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• pp.106-112
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• 2010

Accidents at level crossing have large portion on train accidents, and causes economical loss by train delay and operational interruption. Various safety equipments are employed to reduce the accident at level crossing, but existing warning device, and crossing barrier are simple train-oriented protection equipments. In this paper, intelligent railway level crossing system is proposed to prevent and reduce accidents. For train driver's prompt action, image of level crossing and obstacle warning message are continuously provided to train driver through wireless communication in level crossing control zone. Obstacle warning messages, which are extracted by computer vision processing of captured image at level crossing, are recognized by train driver through message color, flickering and warning sound. It helps train driver to decide how to take an action. Meanwhile, for vehicle driver's attention, location and speed of approaching train are given to roadside equipments. We identified the effect of proposed system through test installation at Sea train and Airport level crossing of Yeong-dong line.

• Journal of the Semiconductor & Display Technology
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• v.19 no.4
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• pp.34-38
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• 2020

In this paper, we implement a Dashcam system capable of shooting 360 degrees using a Raspberry Pi, shock sensors, distance sensors, and rotating camera with a servo motor. If there is an object approaching the vehicle by the distance sensor, the camera rotates to take a video. In the event of an external shock, videos and images are stored in the server to analyze the cause of the vehicle's accident and prevent the user from forging or tampering with videos or images. We also implement functions that transmit the message with the location and the intensity of the impact when the accident occurs and send the vehicle information to an insurance authority with by linking the system with a smart device. It is advantage that the authority analyzes the transmitted message and provides the accident handling information giving the user's safety and convenience.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.9 no.5
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• pp.439-444
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• 2016

This paper proposes the technique to protect the privacy of those who uses Smart Tourism Service based on location. The proposed privacy protection technique (1) generates a shared private key, OTK(One Time Key) without information exchanging Users with a Tourism Server and provides Users and a Tourism Server with message confidentiality by encrypting data with the key, (2) concatenates users' ID, login time(timestamp), and randomly-generated nonce, generates OTK by hashing with a hash function, encrypts users' location information and query by using the operation of OTK and XOR and provides Users and a Tourism Server with message confidentiality by sending the encrypted result. (3) protects a message replay attack by adding OTK and timestamp. Therefore, this paper not only provides data confidentiality and users' privacy protection but also guarantees the safety of location information and behavior pattern data.