• Journal of the Korea Society for Simulation
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• v.11 no.1
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• pp.1-10
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• 2002

IETF proposed Fast Handover mechanism tn reduce the latency during which the mobile node is effectively dusconnected from the Internet. In this paper, we propose three buffering strategies and a bicasting strategy to resolve packet loss and packet disordering problems in Fast Hangover mechanism. Through Java-based simulation we show thats, packet loss and disordering problems have been resolved by our proposal. As the result the buffering and bicasting strategies can reduce the handover delay caused by packet loss and packet disordering, in addition.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.5
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• pp.2305-2310
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• 2011

Recently, communication industry based on data and voice and broadcasting industry centering around images have been rapidly blended. Thereupon, this article aims to suggest a multi-approach method which minimizes the use of network bandwidth allowing multimedia streaming transmission to secure IP-based continuity and let users get multimedia services of one channel or several simultaneously. Also, this study intends to design a buffering strategy that can absorb network delay and an object model to assign and maintain stable channel bandwidth.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.34S no.1
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• pp.36-42
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• 1997

This paper proposes a high-speed contention resolution scheme featuring high flexibility to the bursty traffic for an input buffering ATM switching architecture and its hardware strategy. The scheme is based on the threshold on the occupancy of the input buffer. As the proposed scheme utilizes the threshold, it has high flexibility to the fluctuations of the input traffic. The hardware strategy for the proposed policy is provided with the aim of the simple structure that achieves the reduction of the signal path and the power consumption. The performance on the average buffer size of the proposed policy is performed and compared with the conventional schame under the bursty traffic through both the analysis based on the markov hain and the simulation. The relations among the parameters on the proposed policy is analyzed to improve the performance.

• Journal of Contemporary Eastern Asia
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• v.13 no.1
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• pp.57-68
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• 2014

This paper positions the triple-Helix as a meso-level notion, an epicycle in a grander circle of technological change, institutional change, and psychological change. Because of the differing speeds of these several kinds of change, speed is proposed as a high-level system metric. This implies that what we commonly call bridging agencies or facilitators - lawyers, venture capitalists, incubators, etc. - are better called buffering agencies, as they help to engage entities changing at different speeds. They use human judgment as well as information technologies to choose feasible timing for these engagements. The paper highlights implications for thinking about innovation diffusion: The grand cycle of socio-technical change means we should, rather, think in terms of innovation reinforcement, or a circle of innovation.

• International Commerce and Information Review
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• v.9 no.2
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• pp.399-422
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• 2007

Like in other trade negotiations covering comprehensive sectors, it is reported that KOREA-US FTA tried so-called 'package deal' at the last minutes, when telecom services sector was positioned at the forefront and expected to partly play a role in buffering US' market-opening pressure on other sectors. Before everything else, Korean negotiators had to enhance the value of foreign ownership deregulation in telecom services sector as a leverage in the course of KOREA-US FTA negotiations. In addition, since foreign ownership change, if any, is highly sensitive issue either politically or policy-wise, it seems very difficult to find a breakthrough. Focusing on foreign ownership regulation in telecom services sector, this paper seeks how Korea has developed its strategic reasoning for negotiations and evaluates the outcomes of KOREA-US FTA negotiations.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06c
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• pp.124-126
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• 2006

휴대전화, PDA, GPS 등 모바일 기기들의 발전과 보급으로 인하여 위치 기반 서비스에 대한 관심이 크게 증가하고 있다. 휴대폰 사용자 위치 추적과 같은 대용량의 객체를 처리하기 위해서 기존의 단일 노드 기반 시스템으로는 어려움이 있어, 클러스터 기반 분산 컴퓨팅 구조로 GALIS 아키텍처가 제안되었다. 본 논문에서 제안하는 질의 처리 성능 개선을 위한 버퍼링 기법은 GALIS의 질의 처리 서브 시스템 성능 향상을 위해 질의 처리 결과를 버퍼링하고 연속된 질의 처리시 발생할 수 있는 중첩된 질의 영역을 관리하게 설계 하였다. 버퍼링 기법을 통해 수행되는 질의는 중첩된 질의 영역을 제외한 부분만을 수행하기 때문에 결과 셋의 크기를 줄여주는 역할을 하고, 질의 처리 시간 감소에 큰 영향을 미친다.

• International Journal of Computer Science & Network Security
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• v.23 no.3
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• pp.81-93
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• 2023

The popularity of short-form video platforms like TikTok has increased recently. Short-form videos are significantly shorter than traditional videos, and viewers regularly switch between different types of content to watch. Therefore, a successful prefetching strategy is essential for this novel type of video. This study provides a resource-effective prefetching technique for streaming short-form videos. The suggested solution dynamically adjusts the quantity of prefetched video data based on user viewing habits and network traffic conditions. The results of the experiments demonstrate that, in comparison to baseline approaches, our method may reduce data waste by 21% to 83%, start-up latency by 50% to 99%, and the total time of Re-buffering by 90% to 99%.

• Journal of Information Processing Systems
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• v.18 no.6
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• pp.729-740
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• 2022

Netflix, Amazon Prime, and YouTube are the most popular and fastest-growing streaming services globally. It is a matter of great interest for the streaming service providers to preview their service infrastructure and streaming strategy in order to provide new streaming services. Hence, the first part of the paper presents a detailed survey of the Content Distribution Network (CDN) and cloud infrastructure of these service providers. To understand the streaming strategy of these service providers, the second part of the paper deduces a common quality-of-service (QoS) model based on rebuffering time, bitrate, progressive download ratio, and standard deviation of the On-Off cycle. This model is then used to analyze and compare the streaming behaviors of these services. This study concluded that the streaming behaviors of all these services are similar as they all use Dynamic Adaptive Streaming over HTTP (DASH) on top of TCP. However, the amount of data that they download in the buffering state and steady-state vary, resulting in different progressive download ratios, rebuffering levels, and bitrates. The characteristics of their On-Off cycle are also different resulting in different QoS. Hence a thorough adaptive bit rate (ABR) analysis is presented in this paper. The streaming behaviors of these services are tested on different access network bandwidths, ranging from 75 kbps to 30 Mbps. The survey results indicate that Netflix QoS and streaming behavior are significantly consistent followed by Amazon Prime and YouTube. Our approach can be used to compare and contrast the streaming services' strategies and finetune their ABR and flow control mechanisms.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.36S no.2
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• pp.19-27
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• 1999

This paper propose a contention resolution policy featuring dynamic change of the threshold for the occupancy of the input buffer for an input buffering ATM switching architecture and its hardware implementation strategy. The strategy is provided with the aim of the simple structure that achieves the reduction of the signal path and the power consumption. The threshold is changed dynamically every time slot based both the arrived of cells and the cell service resulting from the contention resolution. The performance on the cell loss of the proposed policy is performed and compared with the conventional policy under the diverse traffic conditions through both the analysis based ont the Markov chain and the simulation.

• Journal of the Korean Operations Research and Management Science Society
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• v.37 no.4
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• pp.211-223
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• 2012

This study purposed to evaluate the influences of rival hospitals on the number of patients who visited the a study territory hospital. Spatial analysis technique was used to measure the impact of rival hospitals in study region. Selected hospitals were all medical school affiliated hospitals which were located in Daejeon metropolitan city and Chungchungnamdo. Patient data was collected from the claims data of the study hospital, and the number of inpatient and outpatients who visited the study hospital between January and June in 2008 were calculated on the smallest administrative district, Eup, Myeon, and Dong, in study region. To control the differences of regional characteristics among Eup, Myeon, Dong, socio-economic variables (total population, number of people aged over 65, number of basic livelihood security recipients, distance from the study hospital to the centroid point of each Eup, Myeon, Dong, number of business, and number of employees) were included in analysis model. These variables were collected from the annual year book of city as well as county located in study region. Cluster analysis classified the study region into three groups by using the difference of between th actual number of inpatient/outpatient and the predicted number of inpatient/outpatient in Eup, Myeon, and Dong. Most areas around the rivalry hospitals were categorized into same group. Multiple regression analysis indicated that areas around rivalry hospitals had statistically significantly negative relationship with the number of inpatients and outpatients who visited the study hospital. As the buffer size was increased from 5Km to 10Km, the standardized regression coefficients were decreased. These study results confirmed that rivalry hospitals in region had negative impacts on the performance of hospitals. It suggests that hospitals will require not only to select their location to minimize the effects of rivalry hospitals, but also to establish their strategy to cope with the rivalry's threats in their region.