• LP가스
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• s.76
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• pp.62-68
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• 2001

저공해 LPG청소차의 개발이 성공을 거둔데 이어 화물차와 마을버스, 소형 상용차량의 LPG화가 추진되고 있어 관심을 모으고 있다. SK가스에서 계획중인 소형 상용차량의 LPLi화 사업에 대해 알아본다.

• Aerospace Industry
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• v.80
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• pp.8-11
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• 2003

세계 상업용 항공기 생산의 양대 산맥을 이루는 보잉과 에어버스는 해마다 세계 항공여행 수요를 분석하고 이를 바탕으로 향후 20년을 전망하는 여객기와 화물기의 수요분석 자료를 발간하고 있다. 다음은 보잉의 Current Market Outlook 2002와 에어버스의 Global Market Forecast 2001~2002를 통해 양사의 항공기 수요전망과 시장전략을 비교해 본다.

• Transactions of the Korean Society of Automotive Engineers
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• v.12 no.3
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• pp.91-100
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• 2004

This study presents the development of a new aluminum seat frame for the commercial bus. Back moment and seat belt anchorage analysis of the conventional steel seat frame was conducted as a base model. Effective aluminum section dimensions for aluminum pipe were calculated from equivalent stiffness and equivalent weight study. Back moment and seat belt anchorage strength with the developed aluminum seat frame were compared to those of the base model. Additionally, to pass the fatigue test, shape modification of side frame assembly was conducted. From this study we could reduce the weight of seat frame more than 5 kg. And the current analysis model and procedure can provide useful informations in designing a new commercial car seat and can reduce the overall design cost and time.

• Satellite Communications and Space Industry
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• v.8 no.1 s.18
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• pp.69-75
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• 2000

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.634-635
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• 2022

COVID-19의 확산과 급속한 디지털 전환으로 인해 비대면으로 소통하고 정보를 교류하는 메타버스 플랫폼이 최근 많은 주목을 받고 있다. 하지만 새로운 플랫폼의 등장에도 불구하고 대부분 게임이나 상용 시스템 위주로 적용되고 있으며 학술정보서비스 영역에서의 적용은 요원한 현실이다. 본 연구에서는 기술의 적용 형태와 지향범위에 따른 메타버스의 '증강현실, 일상기록, 미러월드, 가상세계' 등의 4가지 유형과 메타버스 플랫폼 주요 현황을 살펴보고, KISTI에서 제공하고 있는 과학기술지식인프라 통합서비스 ScienceON과 연계하여 디지털 연구환경 조성과 개방형 협업연구 활동을 지원하는 메타버스 플랫폼 키온버스의 제공서비스 유형과 주요 기능 등 학술정보서비스 영역에서의 메타버스 적용방안을 제시하였다. 본 연구는 학술정보서비스에 적용된 메타버스 플랫폼의 사례로서 향후 메타버스 활성화에 기여할 것으로 기대한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.345-347
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• 2015

인공위성은 다양한 센서장치, 구동장치, 전자장치들로 구성되어 있으며, 위성을 제어하는 컴퓨터 장치는 이들 장치들과 다양한 종류의 통신 버스로 연결되어있다. 정의된 프로토콜에 따라 명령을 전송하고 장치들의 상태 정보를 수집하여 위성을 운영한다. 위성에서 많이 사용되는 대부분의 상용 센서나 구동장치들은 표준화된 버스 (ex, 1553B, CAN, UART, etc ...) 인터페이스를 지원한다. 그러나 위성의 임무나 설계에 맞게 특수하게 제작된 장치의 경우는 범용의 버스보다는 용도에 적합한 프로토콜이 설계되고 제작된다. 본 논문에서는 2018년 발사 예정인 정지궤도복합위성 컴퓨터 장치 (GMU) 내의 프로세스 모듈과 시스템의 이상상태를 감지하여 GMU의 운용 모드 및 형상의 변경을 담당하는 MRE 모듈사이의 통신을 담당하는 IMGL 설계를 소개하고 IMGL 운영을 담당하는 소프트웨어 설계 및 구현 내용을 기술한다.

• Journal of Korean Society of Transportation
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• v.32 no.1
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• pp.63-72
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• 2014

In this paper, characteristics and types of vehicle accidents involving buses that differ from common passenger cars are analyzed. When heavy vehicles are involved in collision accidents, the external impulse conveyed through bus tire from road surface cannot be ignored, so the conventional rigid-body impact model cannot be applied. As a solution, an analysis model which directly considers the tire impulse or considers the bus as moving barrier has been proposed. Also, as there are many instances in which the location of contact point or coefficients related to rotational motion cannot be estimated, utilization of point-mass collision model has been sought. By applying the proposed analysis model to an actual accident case and comparing with the result of the conventional analysis which does not consider the tire impulse, it is shown that the velocity of bus and other values close to the actual amount can be obtained.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.12
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• pp.1170-1178
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• 2013

Thanks to various benefits, low-cost real-time communication networks so called fieldbus have been widely used in many industrial applications including military systems, such as aircrafts, submarines, and robots. This paper presents a reliability analysis of dual-channel CAN(Controller Area Network) fieldbus which is used for controlling various equipment of submarine combat system. A submarine combat system playing a critical role to the success of missions and survivability consists of various devices including sensors/actuators and computers. Since a communication network for submarine combat system must satisfy an extremely high level of reliability, a dual channel technique is commonly adopted. In this paper, a Petri Net based reliability model for dual-channel CAN is discussed. A reliability model called generalized stochastic Petri Nets (GSPN) is built by utilizing the information on physical faults with CAN. The effectiveness of the proposed model is analyzed in terms of unreliability with respect to failure rate and repair rate.

• Journal of Internet Computing and Services
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• v.24 no.1
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• pp.87-97
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• 2023

Charger infrastructure facilities are designed and installed based on a constant power supply. Initially designed charging facilities support charging of rapidly growing electric vehicles on a limited power supply basis. In addition, current commercial vehicles can only be fully charged, and are supported by the rapid equalization charging method. However, commercial vehicles operate according to a set schedule, so flexible charging is essential. In this paper, we propose a power operation method with more than 20% efficiency improvement by using a fixed schedule-based charging scheduling and power distribution technique of a commercial bus based on the same amount of power in accordance with the rapid growth and increase of electric vehicles.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.6
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• pp.1023-1030
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• 2020

Wearable devices, such as a smart watch and a wrist band, store owner's private information in the devices so that security in a high level is required. Applications developed by third parties in Tizen request for an access to designated services through the desktop bus (D-Bus). The D-Bus verifies application's privileges to grant the request for an access. We developed a fuzzing tool, so-called DAN (the D-bus ANalyzer), to detect errors in implementations for privilege verifications and access controls within Tizen's system services. The DAN has found a number of vulnerable services which granted accesses to unauthorized applications. We built a proof-of-concept application based on those findings to demonstrate a bypass in the privilege examination.