• 한국조경학회지
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• 제32권5호
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• pp.35-42
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• 2004

This study examines the traffic noise reduction effects of the diverse efficiency features of a sunken square, and investigates the reduction effects and characteristics of noise alterations according to the construction conditions in order to verify its possibility as a new noise reduction facility. The measured data were analyzed. As a result, (1) the traffic noise from the roads around the sunken squares exceeded the regulatory standards; (2) the sunken squares were protected from noise; (3) the sunken spaces yielded a greater reduction by 6∼7dB than the flat ground thanks to the diffraction effect; and (4) there were fine changes to noise according to the conditions of space construction. In short, a sunken square has the potential to afford new applications as a noise reduction facility in a highly concentrated downtown with the existing defects solved. In addition, its use for effective noise control is evident based on the noise characteristics of a space. Future studies need to include efforts to provide clearer quantitative data, as well as research on shape, layout, and materials.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.926-931
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• 2004

In this paper, we proposed security management architecture that combines programmable network technology and policy based network management technology to manage efficiently heterogeneous security systems. By using proposed security management architecture, a security administrator can manage heterogeneous security systems using security policy, which is automatically translated into a programmable security policy and executed on programmable middleware of security system. In addition, programmable middleware that has the features of programmable network can reduce excessive management traffic. We showed that the programmable middleware could reduce the load of management traffic by comparing processing time between the proposed architecture and PBNM architecture.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권12호
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• pp.5669-5684
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• 2018

The new mobile edge network architecture has been required for an increasing amount of traffic, quality requirements, advanced driver assistance system for autonomous driving and new cloud computing demands on highway. This article proposes a hierarchical cloud computing architecture to enhance performance by using adaptive data load distribution for buses that play the role of edge computing server. A vehicular dynamic cloud is based on wireless architecture including Wireless Local Area Network and Long Term Evolution Advanced communication is used for data transmission between moving buses and cars. The main advantages of the proposed architecture include both a reduction of data loading for top layer cloud server and effective data distribution on traffic jam highway where moving vehicles require video on demand (VOD) services from server. Through the description of real environment based on NS-2 network simulation, we conducted experiments to validate the proposed new architecture. Moreover, we show the feasibility and effectiveness for the connected car media service on highway.

• 융합보안논문지
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• 제10권1호
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• pp.9-17
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• 2010

인트라넷의 네트워크는 악성트래픽의 확산과 분산을 차단하는 역할이 수행되는 영역이다. 네트워크 구조상에서는 트래픽 소통경로상에서 악성코드 침투와 보안차단기능이 수행된다. 네트워크보안 아키텍쳐란 침투와 보안차단기능이 수행되는 네트워크 구조상에서의 트래픽처리 영역과 그룹을 차별화하여 구분시키는 개념이다. 인트라넷 네트워크 아키텍쳐는 보안도메인은 영역과 가능을 기준으로 차별화가 가능하고 따라서 도메인별로 차별화된 보안 메커니즘이 개발되고 적용되어야한다. 본 논문는 네트워크 아키텍쳐의 보안 취약성을 진단하고 네트워크는 구조적으로 어떤 가준으로 보안 도메인이 설정되어야하는가에 대한 방법론 개발을 위해 네트워크 형상(Topology) 결정 요소, 보안 아키텍쳐 설정기준, 구조도 선택기준, 차단위치 결정, 경로 방역망 구성기준을 도출한다. 설계된 방법론을 적용할 경우 전통적인 네트워크 구조상에서보다 바이러스 차단 효율이 증대되고 있음이 실험을 통해 입증한다. 따라서 아키텍쳐 영역기준에 따라 차별화된 차단기능이 필요하며 보안 메커니즘 개발이 요구되고 있음을 본 연구를 통해 제시하고자한다.

• 한국조경학회지
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• 제25권3호
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• pp.143-154
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• 1997

The fundamental concept of shared street is integration of traffic and pedestrian activity as a positive principle for street planning. Shared streets have been very successful in several countries in terms of reductions in traffic accidents, increased social interaction and children's play, and a high degree of satisfaction by the residents. This paper proposes the concept of shared street to solve traffic problem without reorganizing traditional street structure and without disturbing traditional function of street as a living space for residents. And this study examines detail concepts and techniques of the shared street and applies them to a pedestrian oriented streetscape design of "Ducksugung-Gil," Seoul, which was one of the most important streets in Korean modernization history.n history.

• 한국통신학회논문지
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• 제29권5B호
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• pp.491-497
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• 2004

본 논문에서는, 인터넷 백본 네트워크상에서 악성의 네트워크 공격 트래픽을 고립시킴으로서 네트워크 인프라를 보호하기 위한 트래픽 제어 방법을 제안한다. 제안된 방법은 개별 플로우 또는 개별 패킷들에 기반을 둔 기존의 방법들과 달리 제안된 공격 탐지 및 제어 방법은 집합된 트래픽 수준에서 운영되므로 계산의 복잡성을 현저히 줄일 수 있으므로 네트워크 공격에 대한 전역 인프라 구축에 활용 가능하다. 실험 결과는 제안된 방법에 의한 트래픽 제어가 네트워크 공격이 이루어질 시 정상 트래픽과 네트워크 자원들을 적절히 보호할 수 있음을 보여준다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.1199-1200
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• 2008

In this paper, we suggest a system architecture for korean air traffic control system through investigating a korean ARTS (Automated radar terminal system) and ACC (Area control center) system. We focus on designing a network architecture for supporting both an approaching control and an area control. This paper will be a base for developing korean air traffic control system by ourselves.

• 전기전자학회논문지
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• 제5권1호
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• pp.35-42
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• 2001

This paper deals with an architecture of network-based control system using the CAN(Controller Area Network) protocol and its traffic analysis. It is difficult to determine an optimal network-based control architecture for a specific AGV(Autonomous Guided Vehicle) system with a manipulator arm. The fixed number of periodic messages to be occurred is pre-defined in the system. To determine whether the proposed system architecture is effective or not, we perform traffic analysis for the real-time communication of all messages. Through simulations, the range of transmission speed is found satisfying required conditions and the permissible number of additional sensors is investigated for improving the system performance, when the sampling periods of analog sensors are determined under fixed condition that the transmission speed is over 500Kbps.

• Wind and Structures
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• 제23권1호
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• pp.19-43
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• 2016

In the present study, a new methodology is presented to study the ride comfort and bridge responses of a long-span bridge-traffic-wind coupled vibration system considering stochastic characteristics of traffic flow and bridge surface progressive deterioration. A three-dimensional vehicle model with 24 degrees-of-freedoms (DOFs) including a three-dimensional non-linear suspension seat model and the longitudinal vibration of the vehicle is firstly presented to study the ride comfort. An improved cellular automaton (CA) model considering the influence of the next-nearest neighbor vehicles and a progressive deterioration model for bridge surface roughness are firstly introduced. Based on the equivalent dynamic vehicle model approach, the bridge-traffic-wind coupled equations are established by combining the equations of motion of both the bridge and vehicles in traffic using the displacement relationship and interaction force relationship at the patch contact. The numerical simulations show that the proposed method can simulate rationally the ride comfort and bridge responses of the bridge-traffic-wind coupled system; and the vertical, lateral, and longitudinal vibrations of the driver seat model can affect significantly the driver's comfort, as expected.

• Earthquakes and Structures
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• 제12권4호
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• pp.457-468
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• 2017

When studying the vibration of a suspension bridge based on the traffic-bridge coupled system, most researchers ignored the contribution of the pavement response. For example, the pavement was simplified as a rigid base and the deformation of pavement was ignored. However, the action of deck pavement on the vibration of vehicles or bridges should not be neglected. This study is mainly focused on establishing a new methodology fully considering the effects of bridge deck pavement, probabilistic traffic flows, and varied road roughness conditions. The bridge deck pavement was modeled as a boundless Euler-Bernoulli beam supported on the Kelvin model; the typical traffic flows were simulated by the improved Cellular Automaton (CA) traffic flow model; and the traffic-pavement-bridge coupled equations were established by combining the equations of motion of the vehicles, pavement, and bridge using the displacement and interaction force relationship at the contact locations. The numerical studies show that the proposed method can more rationally simulate the effect of the pavement on the vibrations of bridge and vehicles.