• 한국정보통신학회논문지
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• 제6권3호
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• pp.416-420
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• 2002

네트워크 트래픽의 연구 동향은 LAN, WAN 및 VBR 비디오 트래픽이 통계학적으로 자기 유사과정에 의해 더욱 더 잘 모델링화 된다는 사실을 입증하고 있다. 이것은 기존의 단기간 의존성만을 고려한 포아손 과정에 비해 다른 이론적 특성을 가진다. 즉 광범위한 시계열상에서 aggregation의 정도가 변하더라도 통계학적으로 동일한 특성을 지니게 된다는 것이다. 본 논문에서는 이러한 자기유사과정을 갖는 데이터를 실시간 운영중인 네트워크로부터 측정하여 트래픽을 모델링하고, 비교분석하므로서 다양한 데이터를 지원하는 초고속 네트워크의 성능분석에 적용할 수 있으리라 여겨진다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2002년도 춘계종합학술대회
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• pp.104-107
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• 2002

네트워크 트래픽의 연구 동향은 LAN, WAN 및 VBR 비디오 트래픽이 통계학적으로 자기유사과 정에 의해 더욱 더 잘 모델링화 된다는 사실을 입증하고 있다. 이것은 기존의 단기간 의존성만을 고려한 포아손 과정에 비해 다른 이론적 특성을 가진다. 즉 광범위한 시계열상에서 aggregation의 정도가 변하더라도 통계학적으로 동일한 특성을 지니게 된다는 것이 다. 본 논문에서는 이러한 자기유사과정을 갖는 데이터를 실시간 운영중인 네트워크로부터 측정하여 트래픽을 모델링하고, 비교분석하므로서 다양한 데이터를 지원하는 초고속 네트워크의 성능분석에 적용할 수 있으리라 여겨진다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권4호
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• pp.1307-1323
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• 2014

With the exhaustion of global IPv4 addresses, IPv6 technologies have attracted increasing attentions, and have been deployed widely. Meanwhile, new applications running over IPv6 networks will change the traditional traffic characteristics obtained from IPv4 networks. Traditional models obtained from IPv4 cannot be used for IPv6 network monitoring directly and there is a need to investigate those changes. In this paper, we explore the flow features of IPv6 traffic and compare its difference with that of IPv4 traffic from flow level. Firstly, we analyze the differences of the general flow statistical characteristics and users' behavior between IPv4 and IPv6 networks. We find that there are more elephant flows in IPv6, which is critical for traffic engineering. Secondly, we find that there exist many one-way flows both in the IPv4 and IPv6 traffic, which are important information sources for abnormal behavior detection. Finally, in light of the challenges of analyzing massive data of large-scale network monitoring, we propose a group flow model which can greatly reduce the number of flows while capturing the primary traffic features, and perform a comparative measurement analysis of group users' behavior dynamic characteristics. We find there are less sharp changes caused by abnormity compared with IPv4, which shows there are less large-scale malicious activities in IPv6 currently. All the evaluation experiments are carried out based on the traffic traces collected from the Northwest Regional Center of CERNET (China Education and Research Network), and the results reveal the detailed flow characteristics of IPv6, which are useful for traffic management and anomaly detection in IPv6.

• 경영과학
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• 제26권1호
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• pp.161-169
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• 2009

A traffic analysis on the Internet has an advantage for obtaining the characteristics of transferred packets. There were many studies to understand the characteristics of the Internet traffic with mathematical statistical approach. The approach of this study is different from previous studies. We first introduced a virtual network concept to present the Internet as a simplified mathematical model. It also represents each traffic flowing on the Internet as a parallel Gaussian channel on the virtual network. We suggest the optimal capacity of each parallel Gaussian channel using some related studies on the Gaussian channel model.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.1328-1332
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• 2010

The enlargement of existing tunnels is required to cope with problems related to traffic congestion. Sometimes, the tunnel traffic must be maintained through existing tunnels during their reconstruction due to non-availability of detours. And excavation by drill and blasting is desired for widening a hard rock tunnel. In this case, the road must be closed for some period for blasting through analyzing of traffic volume. In this paper, a case study on some traffic countermeasures for tunnel enlargement by blasting was performed. And the traffic flow characteristics of some tunnels in domestic main city were analyzed.

• Safety and Health at Work
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• 제7권1호
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• pp.38-42
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• 2016

Background: Truck driving is known as one of the occupations with the highest accident rate. This study investigates the characteristics of traffic collisions according to road types (expressway and rural road). Methods: Classifying 267 accidents into expressway and rural road, we analyzed them based on driver characteristics (age, working experience, size of employment), time characteristics (day of accident, time, weather), and accident characteristics (accident causes, accident locations, accident types, driving conditions). Results: When we compared the accidents by road conditions, no differences were found between the driver characteristics. However, from the accident characteristics, the injured person distributions were different by the road conditions. In particular, driving while drowsy is shown to be highly related with the accident characteristics. Conclusion: This study can be used as a guideline and a base line to develop a plan of action to prevent traffic accidents. It can also help to prepare formal regulations about a truck driver's vehicle maintenance and driving attitude for a precaution on road accidents.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2000년도 추계종합학술대회
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• pp.267-271
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• 2000

최근 인터넷 사용의 급증은 전체적인 망 이용율의 증가를 야기시켜 트래픽의 증가 원인이 된다. 이러한 트래픽 분석을 통해 통계적인 특성을 갖는 장치의 설계와 배치가 요구된다. 따라서, 이러한 인터넷 트래픽의 자기유사성을 분석하고, Simulation 과정을 통해 최적화된 설계요소를 찾아서 실제 네트워크의 성능향상을 연구하고자 한다.

• 한국통신학회논문지
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• 제21권6호
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• pp.1470-1479
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• 1996

It was already proved that ATM has stability and flexibility of service applications, but because of the various characteristics of traffic and the QoS on user demandcaused by them, there are so many researches for traffic control method. In this paper, in order to give the more similar properties of the real traffic to the existing input traffic source, dividing them into four classes with different characteristics, and We proposed the integrated dynamic priority method, IDP which has advantages of the DMLT and the DQLT for time dynamic priority. Thus, it makes input queues about each of traffic classes and thresholds, and then use modified DMLT and DQLT methods. It has goal that proposed method to get more reliability and stability with advantage low loss of the DMLT, low delay of DQLT.

• 한국도로학회논문집
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• 제19권6호
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• pp.201-212
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• 2017

PURPOSES : The objective of this study is to identify the characteristics affecting traffic accidents that have occurred in 564 industrial complexes nationwide from 2011 to 2015. METHODS : The traffic accidents were specified using various factors such as industrial complex type (national VS. general), industrial complex degradation (old VS. non-old), location of complex (capital VS. non-capital), and traffic law violation (speeding, signal violation, and median invasion). The average number of crashes and accident ratio (fatal, severe, and both) in terms of characteristics of industrial complexes were calculated. With a sample of crashes of the industrial complexes for 5 years, statistical significances were tested to analyze and compare the differences based on industrial complex and traffic law characteristics using parametric and non-parametric methods. RESULTS : From statistical results, it is observed that the crash frequency occurring in old industrial complexes is three times higher than that in non-old industrial complexes. Old industrial complexes located in a capital area, old national industrial complexes, and old general industrial complexes are considerably related to higher crash frequency, but the fatal accident ratio appeared to have no statistical difference across industrial complex characteristics. Severe crashes are more likely to occur in non-old industrial complexes on an average. CONCLUSIONS : It is necessary to eliminate potential threats to roads and traffic in the same manner as illegal parking in industrial complexes through the restoration of old industrial complexes. To improve the efficiency of road infrastructure, efforts should be made to improve traffic safety in accordance with industrial characteristics such as planning and operation of relevant local government programs.

• 한국항해항만학회지
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• 제29권10호
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• pp.821-826
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• 2005

2006년 영일만 신항이 개장될 경우 포항항 진입 수역은 선박 통항량이 증가하고 중대형 선박들의 입출항이 가속화될 것이다. 그러나 포항항 일부 진입 수역에는 여전히 항행 위험 요소가 존재하고 있다 즉, 호미곶 인근 해역에서의 무질서한 항행 및 교통이 폭주하고 있어 통항 안전성을 고찰하기 위하여 해상교통조사를 실시하였다. 또한 해상교통조사 결과를 선종별 및 톤수별로 통계 처리하고 통항 선박의 항적 분포 등을 토대로 통항 선박의 주요 통항로 및 통항 특성을 분석하였으며, 향후 포항항 진입 수역의 항로지정에 활용하고자 한다.