• ETRI Journal
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• v.19 no.3
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• pp.169-185
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• 1997

This paper presents the design concepts and the system architecture of a mobile exchange for CDMA Mobile System. The paper also discusses complex subsystems in this system and design concepts of these subsystems. To evaluate the performance of the CDMA Mobile System, we have performed a computer simulation based on the framework of the mobile exchange. Simulation results are presented in terms of network traffic load (call attempts per second) and database performance requirements (transactions per second.)

• Electronics and Telecommunications Trends
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• v.33 no.5
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• pp.42-50
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• 2018

UDN is expected to be a type of network capable of satisfying the requirements various 5G services, such as the peak data rate, connection density, and area traffic capacity. Technical challenges for 5G UDN, such as interference management, resource management, mobility management, load balancing, and energy efficiency are discussed. In addition, candidate technologies for solving these challenges, and their related standardization trends, are summarized in this article.

• Proceedings of the IEEK Conference
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• 2003.11c
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• pp.129-132
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• 2003

This paper proposes a performance analysis model of security sowers. Performance analysis of security server reflects both the session and data traffic load. The proposed model is the bases of estimating the maximum response time and minimum queue size of a security server comprising a session association processor whose throughput is 1000 connection/s.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.174-174
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• 2004

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.4
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• pp.305-313
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• 2013

This paper presents a simulation system for air traffic control (ATC) training. The structure of the ATC is analyzed to define simulation components to be developed. Requirements that must be satisfied by a training simulator are also identified. The results were reflected in the design of the simulator. The training simulator is composed of three modules same as in real life : air traffic controller, aircraft, radar. Each developed module performs the strict unit tests and combine test based on the scalability, ease, real-time, the operating range of the algorithm derived from the requirements. The simulation system can be connected to an actual ATC, and used to validate the ATC system. At peak load, 1200 aircraft and 30 radars can be operated simultaneously.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.10
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• pp.2237-2246
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• 2010

In this paper, the performance of a RCO-MAC protocol is evaluated using a different traffic model. Data frames are assumed to generate based on an exponential distribution from one source node and then directly to be stored into the input buffer in the source node. System throughput, average access delay and average system delay are used as a performance measure. Performance evaluation is carried out by the computer simulation. Numerical results show that the RCO-MAC scheme offers 18% higher system throughput than the rDCF scheme. In addition, the numerical results show that the RCO-MAC protocol also offers the better average system delay under any traffic load than that by the rDCF scheme, which was not obtained in the previous research due to the saturated traffic model.

• Journal of KIISE:Information Networking
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• v.27 no.2
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• pp.197-205
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• 2000

This paper proposes and evaluates a scheme which enhances real-time performance on the Ethernet-based residential network where cable length is very short and most of traffic passes through a specific device. The scheme aims at enhancing deadline meet ratio of the real-time traffic, for example, video stream by means of applying the functionalities such as queue discrimination and early packet discard as well as maintaining network load properly. The design includes the description on hardware interfaces along with the software modules such as scheduler, device driver and connection manager. The simulation results via SMPL suggest that the proposed network can be used as a cost-effective residential network. We also measure the permissible bandwidth for non-real-time traffic without degrading the performance of real-time traffic.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.11B
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• pp.956-966
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• 2004

Nowadays, NGN(Next Generation Network) is evolving into network with packet based QoS.\ulcorner This paper presents the recovery method as a selecting way of more efficient path in MPLS network that reduces the service interruption time. In order to increase the efficiency of usage of recovering resource which is one of major functions of disorder recovering, it opens the state information of each Node both to fault detector and bandwidth broker so that it reduces message transmission time for recovery when functional disorder occurs. in addition, by effective management and adjustment of required bandwidth of entire network depending on the changes of traffic load, it improves the efficiency of bandwidth usage. and in MPLS network supporting priority selection function, it allocates domains depending on the traffic relating to priority order to the entire network so that\ulcorner it efficiently allocates proper resources to the restoring process between the entry and the end for the traffic of high priority and for low priority traffic, it restores path oかy inside disordered domain. by doing this, it reduces resetting time and unnecessary massage transmission.

• Journal of IKEEE
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• v.6 no.2 s.11
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• pp.161-168
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• 2002

Network of these days, A transmission medium of information is replaced from electric signal to optical signal to accept various and increased network traffic. In this paper, we develop simulation program using AweSim and simulate EPON system as a high-speed optical subscriber network with various conditions. The effects of number of ONUs, effects of network load and effects of slot assignment schemes have been evaluated. The simulation results show that slot assignment schemes and number of ONUs is major factor of network performance. The variable-number slot scheme is more efficient than fixed-length slot scheme in the traffic processing.

• Journal of the Korean GEO-environmental Society
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• v.5 no.1
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• pp.65-73
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• 2004

The analysis of corrugated steel pipes is depending on a second dimension frame analysis or compressed ring model. This is the analysis not to consider the behavior of soil-structure interaction. The behavior of load resistance system is varied according to the depth of cover and the spacing of corrugated steel pipes structure. Therefore, the behavior characteristic of corrugated steel pipes was confirmed through finite element analysis to consider the activity of soil-structure interaction. If soil cover is filled up to the more of optimal depth, behavior of corrugated steel pipes are similar to those of ductile steel pipes according to the earth pressure distribution and effects of traffic loads are decreased. But, If soil cover is filled up to the less of optimal depth, corrugated steel pipes can't behave completely as ductile steel pipes because the passive earth pressure acting on side of corrugated steel pipes is decreased according to the decrement of vertical earth pressure, and the traffic loads influence on the section forces is increased, so that the traffic loads dominated the behavior of corrugated steel pipes.