• Journal of the Korean Society of Safety
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• v.24 no.4
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• pp.104-110
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• 2009

In this driving simulation study, the impairing effects of various types of electronic devices usage(i. e., destination search by using in-vehicle navigation system, TV watching and dialing cellular phone) during driving on front-to-rear-end collision avoidance were investigated. Percentage of collisions, driving speeds when the drivers collided, and initial reaction time for collision avoidance were analyzed and compared as the dependent measures. The results indicated that (1) any types of electronic devices usage during driving induced more serious collision-related impairment than control condition where no additional task was required, and (2) in general, destination search task appeared to impair drivers collision avoidance performance more than the other task requirements in terms of percentage of collisions and initial reaction time for collision avoidance, but TV watching induced most serious collision impact. These results suggested that any types of electronic device usage could distract drivers attention from the primary task of driving, and be resulted in serious outcome in potentially risky situation of front-to-rear-end collision. In particular, mandatory use of eye-hand coordination and receiving feedback seemed to one of essential factor leading the drivers visual attentional distraction.

• Annual Conference of KIPS
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• 2012.11a
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• pp.818-821
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• 2012

M2M 서비스 지원을 위한 이동통신 인프라 기술은 3GPP에서 MTC(Machine Typer Communications)라 부른다. 최근 3GPP SA1, SA2 에서는 MTC 디바이스와 MTC 서버 통신 모델 기반의 서비스 모델 및 지원에 관한 네트워크 구조 기술표준이 추진되었다. 이 후 후속 작업으로 3GPP SA1에서는 TR 22.888(MTCe: Study on Enhancements for MTC) 문서를 통해 MTC 디바이스 간 통신 시나리오 및 use case 개발이 추진 중이다. TR 22.888 문서에는 MTC 디바이스 간 통신 접속 시나리오 및 use case를 정의하고 이에 대한 3GPP 네트워크 요구사항을 개발하고 있다. 현재 TR 22.888v0.7 에서는 5가지의 MTC 디바이스 간 통신 시나리오가 개발되었다. 각 시나리오는 MTC 디바이스가 접속을 원하는 원격 MTC 디바이스와 연결 설정 과정에서 직접연결, MTC 서버를 통한 연결, 네트워크/MTC 서버 내에 이름 분석 기능(name resolution function) 지원을 통한 연결, 그룹 통신 내 MTC 디바이스 간 연결, 네트워크 코디네이션(network Coordination) 지원을 통한 연결 등으로 구분된다. 본 논문에서는 이와 같은 M2M에서 디바이스간 직접 통신에 관한 시나리오 및 usecase를 분석한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.12
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• pp.1091-1101
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• 2012

Device-to-device (D2D) communication is expected to offer local area services with low transmit power and short link distance, even not via any infrastructures. These advantages will lead to the deployment of D2D systems in a massive scale, where the order of magnitude of D2D user density is higher than that of cellular user density. Network-assisted D2D systems, where D2D resources are managed by cellular networks, are unable to support the large number of D2D devices, due to the signaling overhead for control signals. In this case, no coordination can be an answer. This paper considers uncoordinated D2D systems, which is implemented with a number of D2D devices in a large scale. By analyzing the transmission capacity of D2D systems, we found a feasibility condition under which the uncoordinated D2D communications possibly coexist within cellular networks, sharing the uplink spectrum. In addition, we provide guidelines for the operational points of massive D2D communications, giving some knowledge about proper transmit power level and link distance of uncoordinated D2D.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.711-716
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• 2003

This study considers the implementation issues of the inter-vehicle communication system for the vehicle platoon experiments via a testbed. The testbed, which consists of three scale vehicles and one RCS(remote control station), is developed as a tool for functions evaluation between simulation studies and full-sized vehicle researches in the previous study. The cooperative communication of the vehicle-to-vehicle or the vehicle-to-roadside plays a key role for keeping the relative spacing of vehicles small in a vehicle platoon. The static platoon control, where the number of vehicles remains constant, is sufficient for the information to be transmitted in the suitably fixed interval, while the dynamic platoon control such as merge or split requires more flexible network architecture for the dynamical coordination of the communication sequence. In this study, the wireless communication device and the reliable protocol of the flexible network architecture are implemented for our testbed, using the low-cost, ISM band transceiver and the 8-bit microcontroller.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.406-407
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• 2011

The closed-loop distribution system is more flexible and more reliable than radial system. If any type fault occurs, the reliability of system can be better by providing electrical energy through another distribution line. However, it needs protection device coordination of different type. Typically, it is available by using directional overcurrent relay (67). This paper gives a solution about loop protection relay modeling which can be used by the simulation tools.

• Proceedings of the KAIS Fall Conference
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• 2012.05b
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• pp.554-558
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• 2012

최근 이산화탄소 배출권 문제 등 에너지와 환경문제가 대두됨에 따라 신재생에너지의 도입이 증가하고 있다. 신재생에너지전원은 전력 수급 측면에서 부하 증가에 따른 공급을 가능하여 신뢰성 확보할 수 있다. 그러나 고장 전류 측면에서 고장전류가 증가하여 기존의 보호협조 및 차단기 동작에 악영향을 미칠 수 있다. 특히, 신재생에너지전원의 연계용 변압기 결선방식으로 인해 보호기기가 오동작이 발생 할 수 있다. 따라서 본 논문에서는 보호기기의 오동작을 해결하기 위하여 신재생에너지전원이 연계된 스마트 그리드 수용가 설비의 양방향 보호협조 제어장치(영상지락전류(NGR) 제어장치) 설계하고자 시뮬레이션 분석을 수행하였다.

• Journal of the Korean Professional Engineers Association
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• v.13 no.3
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• pp.60-64
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• 1980

Top manager and factory manager in the small-medium industrial factory in Korea was conscious of industrial education training requirement more than past, it began the Saemaul movement in factory from 1974, and the 1st nation wide meeting of industrial Standardization & Quality control Movement from 1975, etc. It is that industrial education training through the influence of pan-industrial nation with program. Because it is non-system and unplanned that are a short period introduction of industrial education training operation. Now then they are received better apprecation through the information of the program ecommendation and consultancy of industrial education training from coordination with related professional agencies and goverment agency for small-medium industry promotion.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2771-2773
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• 2005

In network human-robot interaction, human can access services of a robot system through the network The communication is done by interacting with the distributed sensors via voice, gestures or by using user network access device such as computer, PDA. The service organization and exploration is very important for this distributed system. In this paper we propose a new agent-based framework to integrate partners of this distributed system together and help users to explore the service effectively without complicated configuration. Our system consists of several robots. users and distributed sensors. These partners are connected in a decentralized but centralized control system using agent-based technology. Several experiments are conducted successfully using our framework The experiments show that this framework is good in term of increasing the availability of the system, reducing the time users and robots needs to connect to the network at the same time. The framework also provides some coordination methods for the human robot interaction system.

• Journal of the Optical Society of Korea
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• v.20 no.2
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• pp.321-324
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• 2016

Transformation optics methodology provides a new pathway for designing novel devices. It is based on changing a material’s permittivity and permeability. A design for changing the appearance of an object by transformation optics methodology is proposed here. Through a certain transformation, the relations of the metric spaces and the calculation of the material parameters are derived, and the aim of changing the apparent size of an object can be realized. Full wave simulations are performed to validate the proposed device’s performance. It is possible to think that the methodology will improve the flexibility of designing interesting applications in microwave and optical regimes.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2009.04a
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• pp.236-239
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• 2009

Since 1990s, we have achieved a certain level of success in standardization of design, construction, and material on housing and public buildings with the national-level promotion. A practical connecting device that can synthesize all the serial processes is required to maximize the effect of construction material standardization. However, desired outcome of the standardization is not achieved yet because these serial standards and notification practices are decided by each part of the process and some are congested. In this study, we aim to improve a general organizational system of Korean Industrial Standard (KS) which is the most fundamental tool for the standardization of construction materials moving from a conventional idea that the standard is only for the material and components producers to a concept that can also be shared by the designers and construction workers. To achieve this, we propose an improvement plan for the Korean Industrial Standard in the perspective of three-tier classification system.