• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.5
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• pp.18-34
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• 2021

Pedestrian deaths in Korea due to traffic accidents are 40 percent of the fatalities in traffic accidents, which is about twice the average of OECD member countries. To reduce severe pedestrian accidents, it is necessary to apply the accident reduction measures to high-risk drivers (novice, elderly, and commercial vehicle drivers) who are more likely to cause traffic accidents than general drivers. Therefore, this study analyzed the effect of safe driving education on high-risk drivers' behavior. Here, the safe driving education is chosen as the measure to reduce traffic accidents. As part of the study, sudden pedestrian crossing situations were implemented in the driving simulator, and the vehicle trajectory data were collected to compare the driving behavior before and after the education. Most surrogate safety measures showed no improvement in the driving behavior of novice and elderly drivers, and the effect of safe driving education was found to be significant only in the group of commercial vehicle drivers. The results implied that additional measures such as pedestrian safety infrastructure and driver assistance systems, apart from the safe driving education, may be needed for novice and elderly drivers to reduce pedestrian accidents caused by them. With the findings mentioned above, this study is expected to provide a foundation to establish a plan to reduce pedestrian accidents caused by high-risk drivers.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.8 no.6
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• pp.493-503
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• 2018

The present study is a conceptual replication of O'Grady, Lee, and Choo's (2003) earlier study designed to investigate two hypotheses (linear distance hypothesis vs. structural distance hypothesis) in relation to L2 Korean learners' processing of Korean subject and object relative clauses (RCs) in a scholarly attempt to explicate Keenan and Comrie's (1977) Noun Phrase Accessibility Hierarchy (NPAH). In addition, the current study is intended to explore any potential role of working memory capacity (WMC) in the processing of Korean subject and/or object RCs. Chinese-speaking learners of Korean taking a language course offered at a local university in Korea participated in this experimental study. Among those recruited, only 23 learners completed the experimental tasks appropriately according to the specific instructions provided on each task, and thus, subsequent statistical analyses were conducted on their data. Fifteen Korean NSs were also recruited for the control group. Two experimental tasks were administerd to the participants: one picture selection task containing the same test items used in O'Grady et al.'s study to measure their processing of subject-object RCs and an operation span (OSPAN) task to measure their WMC. Somewhat differently from O'Grady et al.'s findings, the participating Chinese learners of Korean performed significantly better on object RCs than on subject RCs, seemingly lending support to the linear distance hypothesis. Further analyses, however, suggested that the results in favor of, or relative ease of processing, object relative clauses were due, most likely, to the learners' excessive use of the canonical sentence strategy, which also led to nonsignificant correlations between WMC and learner performance on the picture selection task.

• Journal of Korean Tunnelling and Underground Space Association
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• v.24 no.6
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• pp.629-636
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• 2022

Domestic eco-friendly vehicles currently account for 5.8% of the total registered vehicles in Korea. Hydrogen vehicles, one of the representative eco-friendly vehicles, have grown rapidly as they have been expanded to the market based on the government's policy to boost the hydrogen industry. Therefore, it is time to expand the safety review of hydrogen vehicles in various directions according to the increase in supply. In this study, the effect of internal heat damage was analyzed when a jet flame was generated by a hydrogen car in a road tunnel. It was simulated using Fluent, and the amount of jet flame injection was selected in consideration of the hydrogen tank capacity of commercial hydrogen vehicles for road tunnels. In addition, the study was conducted with the direction of the jet flame and the nozzle distance from the tunnel wall as variables. From the results, when the jet flame erupted in the road tunnel, high radiant heat emission of more than 20 kW/m² was generated in most areas within ±5 m in the longitudinal direction based on the vehicle (spray nozzle) and 5 to 7 m in the lateral direction based on the adjacent tunnel wall.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.12
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• pp.417-425
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• 2020

Recently, the development of weapons systems in conjunction with the Fourth Industrial Revolution has increased the number of weapon systems that integrate individual commercial systems by actively incorporating the superior fields of private commercial technologies. In the case of such commercial product-based weapons systems, however, the development of ILS elements across all areas, such as technical manual, military field maintenance support equipment, interactive electronic technical manual (IETM), and Computer Based Training (CBT) development, and weapons system Reliability, Availability, Maintainability(RAM) target values, and logistics support analysis (LSA) was requested to expand the level of development by developers. The commercial product-based System Integration (SI) weapon system will be able to complete the comprehensive military balance for complementing and effective maintenance of the military and developers only when the ILS development, which is limited to the essential elements of the required group, Request For Proposal (RFP) and Post-Logistics Support (PLS) directions were applied in the framework of outsourcing maintenance implementation. As a result, by checking the operation status of current weapons systems, the logistics support of commercial product-based weapon systems selected outsourcing as the basic policy that is decided based on the development requirements, focusing on maintaining operation through a rational decision-making process, and presented a plan for applying the development plan to the RFP for the determined core elements and PLS.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.11
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• pp.4100-4107
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• 2010

The wrecker truck of lift type is used to move damaged car in accident spot or to move illegal vehicle in towaway zone toward pound.. This special vehicle drives by lifting front or rear side of car with the driving type of towed car. Each car is modelled with CATIA and is simulated with FEM analysis program ANSYS. This study analyzes how dangerous is the triple collision among the wrecker-towed car-driving car as comparing with the usual collision accident with cars. It is studied how responsible is the towed car in case of crashing its back side by driving car. The influence on the driving angle of towed car by lifting wrecker is also considered.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2000.06a
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• pp.219-226
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• 2000

Frictional performance of ring pack in internal engine is investigated by varying spatial dimensions of ring pack and operating speed. This investigation is performed with commercial software by Ricardo Consultant Engineers, Inc. which is now in wofdwide use in automobile industries. Among the ring performances, blow-by rate, axial ring motions and frictional behaviors of top and second rings are studies in our work.

• Broadcasting and Media Magazine
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• v.19 no.2
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• pp.69-79
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• 2014

본 고에서는 차세대 UHDTV(Ultra High Definition TV) 방송 서비스의 핵심으로 주목 받고 있는 HEVC(High Efficiency Video Coding) 기술을 활용하는 비디오 인코더의 핵심 기술 요소와 향후 발전 전망에 대해 살펴보고자 한다. 더불어, 현재까지 전 세계적으로 개발이 진행되고 있는 UHD용 상용 인코더의 출시 현황 및 향후 발전 전망도 함께 조망해 봄으로써 이 분야에 연구, 개발을 진행하고 있거나 관련되는 사업을 추진하고 있는 독자들에게 미력하나마 도움이 되기를 바란다.

• 정보화사회
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• s.174
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• pp.12-13
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• 2005

최근 정보통신 산업의 발전은 통신.방송이 융합된 다양한 서비스를 언제 어디서나 이용할 수 있도록 하는데 반드시 필요한 전송용량의 광대역화, 고속의 이동성, 그리고 단말의 개인화로 압축된다. 이같은 예로는 현재 국내에서 상용서비스가 제공되고 있는 이동멀티미디어방송(DMB)과 작년말 국내기술로 개발한 와이브로를 들 수 있다. 와이브로는 전송속도, 이동성, 셀반경 등의 측면에서 현재의 이동전화와 무선 LAN의 중간영역에 위치하며, 도심지 내에서 1Mbps 이상의 무선인터넷 서비스를 이동 중에도 끊김 없이 사용할 수 있는 대표적인 차세대 이동통신 기술이다.

• Defense and Technology
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• no.4 s.254
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• pp.54-65
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• 2000

셀룰라망을 이용한 위치보고체계는 전파통달거리를 고려한 셀 단위로 구축하였기 때문에 지휘망을 이용하는 방안에 비해 신뢰성 있는 보고를 기대할 수 있으며, 동일한 정보를 1, 2차 상급부대에 중복 보고할 필요가 없고, 일정거리 이상의 다른 셀에서 같은 대역의 주파수를 사용해도 무방하므로 주파수 재사용의 효과도 거둘 수 있다. 아울러 인터넷과 데이터 베이스 관리 시스템을 소프트웨어로 효과적으로 연동시킴으로써 현재 상용에서 각광 받고 있는 Web-Server 개념을 군 무선 데이터 통신에 도입하고 하드웨어도 대용량의 지능망으로 발전한다면 위치보고 뿐만 아니라 늘어나는 정보를 효과적으로 처리하기에 충분하리라 판단된다.

• Electronics and Telecommunications Trends
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• v.21 no.5 s.101
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• pp.163-170
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• 2006

IPv6는 국내외로 2008년부터 본격적으로 도입되기 시작하여 2010년에는 상용망 구축이 활발해질 것으로 예상되며, 기존 IPv4와의 연동에 대한 요구는 2020년까지는 지속적으로 유지될 것으로 보인다. 이때 반드시 연구가 선행되어야 할 것 중의 하나는 보안문제로 현재 표준화 관점과 망 운영 관점에서 이를 해결하기 위한 연구가 진행중이다. 본 고에서는 IPv4/IPv6 연동 환경에서 고려해야 할 차세대 보안 기술들에 대해 기술한다. 이를 IPv6 프로토콜 보안 문제와 IPv4/IPv6 연동 보안 문제로 나누어 분석하고, 실제 방화벽 등에서 이러한 보안 문제를 해결하기 위한 방법 등을 기술한다.