• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.7
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• pp.980-988
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• 1993

In this paper, performance of 8-ISDN traffic for the buffer size which is requested of important parameters in switch/multiplexer of B-ISDN with multimedia traffic is analyzed. Multimedia traffic is modeled as a traffic, which is composed of poisson distribution traffic and burst traffic with exponential/geometric ON time duration(Burst duration) Performance of traffic which is modeled as a multimedia traffic is analysed and buffer size, can provide the high quality service, is presented for the cell loss probability. It is simulated using event scheduling approach method which is provided by simulation package, PC SIMSCRIPT II.5. Simulation program is composed of PREAMBLE, MAIN, INITIAL, ARRIVAL, DEPARTURE and STOP·SIM modules. Specially, in case of mixed traffic simulation, ARRIVAL module is composed of ARRIVAL I and ARRIVAL II, and cells are generated independently by each module.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.5
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• pp.41-46
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• 2011

Mobile Ad-Hoc networks (MANET) has been getting the spotlight in the area of the wireless networks because of its flexibility and salability, and developing of many applications with it. As a consequence, MANETs are required to process not only simple data traffics, but also multimedia traffics, which has some constraints on the performances. However, unlike wired-networks, the wireless networks have frequent route-disconnections due to some reasons such as channel errors and mobility. Such frequent link disconnections makes the delivery of multimedia traffics difficult. Even though there many researches on multimedia transmissions on various environments, the performances of multimedia transmissions over fading channel and mobility even using various routing protocols have not been evaluated. Therefore, this paper extensively simulates the MPEG-4 video transmission over fading channel environment with node's mobility. In addition, the performances with two routing protocols such as AODV and DSR are compared. Finally, the simulation results shows that DSR protocol has the better performances to deliver MPEG-4 traffic.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.470-473
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• 2002

기존 차량 트래픽 시스템 관련 연구들은 신호등체계 보다 차선변경을 중요시하고, 차량의 목적지 없이 랜덤으로 주행함으로 사실성이 저하된다. 본 논문에서는 차량 트래픽의 사실성을 높이기 위해 신호등체계를 도입하고 출발지와 목적지 등을 부여한다. 또한 출발지점과 목적지점의 차량 트래픽률을 제어하고, 출발지점에서 목적지점까지의 최적경로를 찾아 주행하는 방법에 대해 설계하고 구현한다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.47 no.6
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• pp.103-112
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• 2010

A study on network traffic analysis and modeling has been exclusively done due to its importance. However, conventional studies on network traffic analysis and modeling only focus on transmitting simple packet stream or traffic features of specific application, such as HTTP. In this paper, we propose a network traffic generator, which reflects the characteristics of multimedia data. To analyze the traffics of online game, which is one of the most popular multimedia contents, we modeled the distribution according to the time between packets and packet size random variable and designed the traffic generator which has the model for input. We generated the traffics of L4D(Left4Dead), WoW(World of Warcraft) with proposed network traffic generator and we found that the generated traffics have similar distributions with real data.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.428-433
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• 2000

IMT-2000에서는 음성 트래픽뿐만 아니라 데이타, 화상, 비디오와 같은 멀티미디어 트래픽을 지원함으로서 더 많은 무선 대역폭이 요구된다. 특히 멀티미디어 데이타의 전송 중에 핸드오프가 발생한다면, 기지국은 멀티미디어 데이타의 QoS를 유지하기 위하여 효율적인 대역 할당 및 핸드오프 방안이 필요하다. 본 논문에서는 IMT-2000 환경에서 이동체의 이동 방향을 추정하여 이를 근거로 대역폭을 예약하고, 멀티미디어 트래픽을 전송하는 핸드오프 기법을 제안한다. 이 기법은 섹터 추정과 존 추정으로 구성된 2 단계 추정에 근거하여 이동체의 위치와 이동 방향을 결정하고 이를 이용하여 대역폭을 예약한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.2
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• pp.193-204
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• 2010

Since Wireless Multimedia Sensor Network(WMSN) needs to process various multimedia data such as audio, image and video data as well as scalar data, it requires a mechanism that can support Quality of Service(QoS) to handle efficiently. This paper classifies traffic in WMSN as periodic monitoring traffic, event traffic, multimedia traffic and query-based traffic, proposes marking algorithm and queue management mechanism that guarantee differentiated QoS in terms of delay, energy efficiency and credibility on each traffic and conduct performance analysis with simulation.

• Journal of Internet Computing and Services
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• v.11 no.4
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• pp.1-10
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• 2010

As recent fusion industry and ubiquitous technology have grown fast, network contents, which require high load, are provided in various infrastructures and facilities such as u-city and smart phones. Therefore, it is anticipated that the playback quality of multimedia compared to network loads degrades dramatically due to the drastic increment of real-time reference of conventional high load contents (eg. multimedia data). In this paper, we improved the method of the traffic assignment based on MPP which elevated the playback quality of multimedia by assigning discriminately the possible traffic of MMS with TP coefficients. When the TP coefficient which combines content preference with media preference was applied to a real-time traffic assignment scheduler, the simulation results showed that the multimedia playback stream was assigned within the possible traffic of a server. The real-time scheduling algorithm was improved by using the TP coefficient that combines the time-dependent image contents and the weighted value of media preference. It was observed from the experiment that the loss of the possible traffic decreases to 3.91% and 3.88% for three and four clients respectively.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1997.11a
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• pp.155-159
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• 1997

ATM(Asynchronous Transfer Mode)은 광대역망에서 여러 형태의 멀티미디어 서비스를 지원하는 수단을 제공한다. 요즘 통신망으로 ATM의 채택이 증가하고, 이 망들이 멀티미디어 통신을 하기 위해 많은 데이터들이 오고 갈 때, 영상을 효율적으로 트래픽 제어함으로써 통신망에 끼치는 영향을 최소화 할 수 있다. 본 연구에서는 장면 전환 검출에 관해 State(상태) 알고리즘, Standard deviation(표준편차) 알고리즘, Percentage(가중치) 알고리즘 등을 이용한 장면 전환 검출의 성능 시험을 했다. Stage 알고리즘은 n상태로 나누어서 이루어지고, Standard deviation 알고리즘은 통계적 측면을 다룬 것이고, Percentage 알고리즘은 비례에 의해 이루어진다. 그 중에 Percentage를 이용한 장면 전환 검출 알고리즘은 다른 알고리즘에 비해 능동적이고 효율적임을 보여 이를 제안한다. GCRA(Generic Cell Rate Algorithm)를 통해 트래픽 관련 파라미터의 지정에 관련한 Nonconforming 셀률에 의한 CDVT와 PCR의 분석을 시도한다. 이 때에도 마찬가지로 Percentage 알고리즘과 GCRA를 장면 전환 검출 데이터와의 상관관계를 통해 파라미터를 정하여 트래픽 관련 GCRA 알고리즘에 적용할 수 있다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.1
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• pp.95-101
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• 2005

In this paper, some performance characteristics of multimedia traffic for mobile ad-hoc networks is studied with simulations. Synthetic streaming video is considered as the multimedia traffic for MPEG-coded video in the simulation. The synthetic video stream is generated with a video stream generation algorithm. The algorithm generate VBR traffics for MPEG video streams with special predefined GOP(group of pictures) patterns that is consisted of a sequence of I(intra-coded), P(predicted-coded) and B(bidirectional-coded) frames. The synthetic VBR streams is transmitted through UDP protocol with on-demand mobile ad-hoc network routing protocols like as AODV and DSR. And performances for video streams through mobile ad-hoc networks is evaluated, the throughputs is compared between data and video traffics.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.12a
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• pp.37-40
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• 2000

This paper deal with a movable boundary multiple access scheme and frame format for ATM over satellite. By mathematical modeling and simulation, we can see that suggested frame format is suitable for non-realtime traffic users.