• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.10a
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• pp.355-359
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• 2000

This paper presents design of an advertising E-commerce (electronic commerce) serve. using push technology which provides clients with multimedia information such as text, audio and video according to their setting information. In the most of existing E-commerce system, users visit the web site in person, see and buy goods. In this paper we show the new E-commerce format: Clients select a field of advertisement of what they want to see on the browser, then EC server sends the clients moving advertisements at regular intervals. Subsequently, the users see advertisements and buy goods. The server of this system was designed using push server that saves moving advertisements in the database and sends the user-specific advertisements to users. The system designed in this study is very an active system contrary to existing passive E-commerce systems.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.2 no.2
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• pp.103-119
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• 2008

Traditional web-based services that require users to browse via documents and fill out forms, are difficult to use with mobile devices. Moreover, as the web paradigm assumes active clients, further complications are introduced in cases where the server is the active entity, instead of the client. This paper presents a Server-Centric Interaction Architecture (SCIA) for wireless applications. The architecture enables servers to initiate communication with clients as well as push secure targeted data to them, in a piecemeal fashion. It further enables the development of highly collaborative wireless services with interactive user interfaces.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.36-39
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• 2000

멀티미디어 통신 시스템은 멀티미디어의 특성상 대용량 데이터를 처리하기 위한 버퍼 관리기법이 요구된다. 버퍼에 있는 데이터를 전달하는 방식에는 데이터를 제공하는 서버가 데이터 흐름을 제어하는 Push 방식과 데이터를 제공받는 클라이언트가 데이터 흐름을 제어하는 Pull 방식이 있다. 그러나 RTP를 사용하는 기존의 멀티미디어 통신 시스템의 경우 서버와 클라이언트 사이에 Push 방식과 Pull 방식 중의 하나만을 제공하기 때문에 다양한 미디어의 재생을 지원하기에는 한계가 있고, 인터렉티브한 통신이 불가능하다. 더욱이, Push/Pull 두 가지 방식을 모두 지원한다하더라도 단일화된 버퍼 구조를 제공하지 않아 메모리 사용의 낭비가 있다는 단점이 있다. 이를 해결하기 위하여 , 본 논문에서는 RTP를 사용하는 멀티미디어 통신환경에서 각각 단일화된 버퍼구조 구조를 가지고 있는 서버와 클라이언트 사이에 Push 방식과 Pull 방식의 전송방식을 모두를 지원할 수 있는 통합된 Push/Pull 전송 모델을 제안한다. 이 기법은 서버와 클라이언트 사이에서 Peer-to-Peer 개념으로 인터랙티브한 Push/Pull 전송을 지원할 뿐만 아니라 일관된 인터페이스를 지원하는 단일 버퍼 구조를가짐으로써 시스템의 메모리 효율을 향상시킬 수 있다.

• Journal of KIISE
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• v.45 no.2
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• pp.175-186
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• 2018

Recently, HAS (HTTP Adaptive Streaming) has been the subject of much attention to improve the QoE (Quality of Experience). In a high latency network, HAS degrades the QoE due to the lost RTT cycle since it replies with a response of one segment to the request of one segment. The server-push based HAS schemes of downloading multiple segments in one request cause QoE degradation due to the buffer underflow. In this paper, we propose a VSSDS (Video Streaming Scheme based on Dynamic Server-push) scheme to improve the QoE in a high latency network. The proposed scheme adjust video quality by estimating available bandwidth and determine the number of segments to be downloaded for each segment request cycle. Through the simulation, the proposed scheme not only improves the average video bitrate but also alleviates the buffer underflow.

• Journal of the Korea Society of Computer and Information
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• v.25 no.12
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• pp.119-126
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• 2020

In this paper, we design and implement a product information guidance system Based on BLE beacons. This system is designed to provide various functions such as contactless entrance service through mobile ticket, seat guidance service, event push service, content push service, and public service. This system consists of three modules: a beacon recognition module, a server linkage module, and a content transmission module. The beacon recognition module implements a function of transmitting a specific ID of a nearby beacon when a customer with a smartphone approaches the available service area. The server linkage module recognizes the beacon ID value, transfers it to the server, and implements the function to check the location of the server having the ID. The content transmission module implements a function of transmitting event or service information set at a corresponding location to a smartphone. The beacon-based product information guidance system implemented in this paper has the advantage of being able to quickly and easily implement various product information guidance systems.

• The Transactions of the Korea Information Processing Society
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• v.7 no.6
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• pp.1766-1777
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• 2000

In multimedia new service on the internet, there are problems such as server overload, network congestion and initial latency. To overcome these problems, we propose a proxy push-caching scheme that stores a portion of continuous media stream or entire stream, and a transmission scheme of NOD continuous media, RTP-RR and RTP-nR to exploit push-caching scheme. With the proposed push-caching scheme, NOD server pushes fixed portion of stream to a proxy when new data is generated, and the cached size of each stream changes dynamically according to the caching utility value of each stream. As a result, the initial latency of client side could be reduced and the amount of data transmitted fro ma proxy server to client could be increased. Moreover, we estimate a caching utility value of each stream using correlation between disk space occupied by the stream and the amount of data stream requested by client. And we applied the caching utility value ot replacement policies. The performance of the proxy push-caching and continuous media transmission schemes proposed were compared with other schemes using simulations. In the simulation, these schemes show better results than other schemes in terms of BHR (Byte Hit Rate), initial latency, the number of replacement and packet loss rate.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.340-343
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• 1999

In this paper, we developed the cyber campus which is a internet based virtual education system. This system is designed by using the client/server architecture and server push mechanism. The basic design tool is mini SQL and PERL for design and implementation. Developed system is tested on the site of Honam university(cybercam.honam.ac.kr) and confirmed its performance. This tool will be very useful as a distance education method for every school and educational agency under the internet environment.

• Journal of Digital Convergence
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• v.10 no.11
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• pp.419-425
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• 2012

In these days, the trends of home networking system is implementation of easily configured system with home security of emergency alarm and visitor verification services. In this paper, we implemented push server system based on Arduino of open source physical computation platform to verify visitors for the homes without home networking services. In the suggested system, visitor verification is performed in and out of home, and home access security of the system could be constructed with low-cost price by use of windows push server system and smart devices with alarm operation in corresponding to not allowed access trying.

• 소프트웨어공모대전
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• s.2
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• pp.95-97
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• 1997

• Journal of KIISE:Databases
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• v.31 no.4
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• pp.422-431
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• 2004

In recent years, different models in data delivery have been explored in mobile computing systems. Particularly, there were a lot of research efforts in the periodic push model where the server repetitively disseminates information without explicit request. However, average waiting time per data operation highly depends on the length of a broadcast cycle and different access pattern among clients may deteriorate the response time considerably. In this case, clients are preferably willing to send a data request to the server explicitly through backchannel in order to obtain optimal response time. We call the broadcast model supporting backchannel as hybrid broadcast. In this paper, we devise a new transaction processing algorithm(O-PreH) in hybrid broadcast environments. The data objects which the server maintains are divided into Push_Data for periodic broadcasting and Pull_Data for on-demand processing. Clients tune in broadcast channel or demand the data of interests according to the data type. Periodic invalidation reports from the server support maintaining transactional consistency. If one or more conflicts are found, conflict orders are determined not to violate the consistency(pre-reordering) and then the remaining operations have to be executed pessimistically. Through extensive simulations, we demonstrate the improved throughput of the proposed algorithm.