• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.1B
• /
• pp.101-108
• /
• 2004

SIP(Session Initiation Protocol) is a suitable protocol for supporting Internet telephony services and currently market requirements fur developing supplementary telephony services such as unconditional call forwarding, call forwarding on busy or no answer, call filtering services have recently grown. CPL(Call Processing Language) is a standard technology that can be used to describe and control internet telephony services. In this paper, we describe the CPL system for supplementary Internet telephony services using SIP as an application level call signaling protocol. Those supplementary services are composed of CPL client which is a SIP UA, SIP Proxy server, Registrar and CPL server In this paper, we describe the design and implementation of the CPL server system in detail which is developed in Linux 7.2 using C and C++ programming languages.

• The KIPS Transactions:PartC
• /
• v.11C no.7 s.96
• /
• pp.1023-1032
• /
• 2004

It is generally known that handoff delay degrades the QoS by packet drop, packet delay and jitter. Moreover. handoff highly effects on QoS in beyond 3G system because not only micro cells for achieving high capacity and fast moving nodes induce the frequent handoff but also hard handoff must be carried out in OFDM system. Therefore, study on a handoff algorithm for guaranteeing QoS is required. Related works on handoff for beyond 3G system mainly focused on reducing the L3 handoff delay or packet loss. That is, these schemes try to compensate L2 delay rather directly eliminate it. However, remained 1.2 delay degrades QoS, especially delay-sensitive realtime traffic. Therefore, we proposed the seamless handoff algorithmwhich can minimize the L2 handoff delay.

• Journal of the Korean Institute of Rural Architecture
• /
• v.17 no.3
• /
• pp.27-36
• /
• 2015

This research studies the adequate size standard of Seogwipo cruise terminal CIQ facility that is scheduled to be built around Gangjeong harbor area in Seogwipo-city. In order to respond to the highly increasing number of passenger cruise ships compared to Seogwipo cruise terminal design in 2010, the adequate size standard of Seogwipo cruise terminal CIQ facility was examined for passenger service level grade. Based on size computation elements such as the number of passengers of cruise ships with the largest size of port entry, ship landing rate, passenger processing ratio, and surge factor, the CIQ facility size for each service level grade was reviewed. As a result, the area of 2,971m2 (A grade), 2,409 m2 (B grade), and 2,088 m2 (C grade) were computed. This showed that the area of B grade was about 82% and C grade 70% compared to the area of A grade. The CIQ facility size computed for each service level grade in this research was analyzed that its area needed to be increased by 322% at least and 458% at most, compared to the CIQ facility area of 649m2 of the existing design (2010). In order to respond to the increasing number of cruise passengers, provide high-level passenger service, and improve the international image of Jeju, Seogwipo cruise terminal should secure the size that is equal to or higher than the B grade of service level.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.33 no.12C
• /
• pp.997-1005
• /
• 2008

In this paper, we proposed advanced T-DMB system which is based on Eureka-147 using UEP coding methods and hiererchical modulation for providing additional services while maintaining BER performance. We simulated the proposed advanced T-DMB system using unequal l6QAM modulation scheme combined with various bit split methods and coding methods such as double binary turbo code of DVB-RCS standard and LDPC code of DVB-S2 standard. In the simulation results, double binary turbo code and LDPC code of proposed advanced T-DMB system have coding gain of 2dB and 3.5dB compared to conventional T-DMB system respectively.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2018.10a
• /
• pp.72-75
• /
• 2018

Internet of Things (IOT) technology is rapidly becoming a reality in many parts of our lives through various products and services. Currently, the perception of Internet services for things is becoming common, and the B2C (Business to Consumer) market is explosively increasing as consumers are increasingly willing to purchase Internet devices. In particular, the economic effects of the Internet based smart home sector are known to be very large, and global manufacturers are launching various consumer oriented products based on smart home services.However, current smart home service products are closed systems because they provide independent devices for each manufacturer and provide only specific devices and services linked to them. There is a need for an environment that can provide intelligent smart home service through linkage between objects or services, and a controller that can provide smart control is needed. Therefore, this paper proposes a smart home remote control that can control the Internet devices and services of objects. The proposed smart home remote control provides an environment in which users can directly rescue services through the IFTTT automated service platform, which is an independent platform for each manufacturer.

• Electronics and Telecommunications Trends
• /
• v.20 no.2 s.92
• /
• pp.93-102
• /
• 2005

유비쿼터스 코리아(u-Korea) 기본전략에 따르면 우리나라는 정치. 사회. 문화. 의료. 복지. 교육. 노동. 외교 등 사회 전반에 걸친 생활문화 혁명이 실현될 것으로 전망된다. 이러한 시점에서 정보보호는 u-Korea 실현의 중요한 핵심 엔진 기술로써u-Korea 전략 추진의 주요한 장애 요인으로 예상되는 사생활 문제와 지역 간. 계층간 정보격차 문제 등의 정보화 역기능을 해소하는 역할을 수행해야 한다. 본 고에서는 정통부가 추진하고자 하는 u-Korea 기본 전략에 대해서 살펴보고, 안전한 u-Korea 실현을 위해서 구체적인 정보화 역기능 방지 대책을 제안한다. 특히, BcN 인프라 보호 기술, RFID/USN 개인 프라이버시 보호 기술, WiBro 및 DMB 등에서 사용되는 복합단말기용 통합 인증. 인가 기술, 안전한 사용자 서비스 제공을 위한 서비스 사용의 익명성과 서비스 관리의 실명성이 제공되는 보안위임서비스 기술 등으로 형성되는 “Security Belt” 정보화 역기능 방지 대책에 대해서 소개한다.

• Electronics and Telecommunications Trends
• /
• v.23 no.5
• /
• pp.99-110
• /
• 2008

3차원 입체 영상은 기존의 2차원 평면 영상과는 달리 사람이 보고 느끼는 실제 영상과 유사하여 시각정보의 질적 수준을 몇 차원 향상시키는 새로운 개념의 실감 영상 미디어이다. 3차원 영상단말기 기술은 멀티미디어의 기술발전을 기반으로 하여 통신, 방송, 신호처리 등 다른 분야의 기술들이 모두 집약되어 있다. 방송의 경우 현재 DMB, DVB-H 및 FLO와 같은 모바일 방송 시스템을 통해서 3차원 TV 서비스가 가능하고 기존 이동 통신망이나 와이브로 또는 와이맥스 망을 통해서도 3차원 서비스의 제공이 가능하다. 본 고에서는 3차원 서비스의 제공이 가능한 모바일 방송 및 통신 시스템과 관련된 국내.국제 기술 동향을 소개하고자 한다.

• Journal of Korean Society for Quality Management
• /
• v.29 no.4
• /
• pp.116-132
• /
• 2001

The world wide web has been growing rapidly. Due to the development, many companies are using the e-commerce through the web as an another tool for the their deal with customers. The internet is utilized as the new distribution business and channel for the most companies. This innovative changes made many people to purchase products through the web. However, there are a lot of problems during the process of supply chain channels. This research is about the impact of service quality on the customer satisfaction in the business-to-consumer(B2C) e-commerce. It was performed by utilizing the methodology for measuring the degree of service quality which has been adopted in the service quality research area. The quality of service is made up of six dimensions(factors): reliability, responsiveness, assurance, empathy, tangible, and convenience. Therefore, we studied the influence of these six factors upon the customer satisfaction, and the results will be summarized.

• Electronics and Telecommunications Trends
• /
• v.30 no.5
• /
• pp.49-58
• /
• 2015

최근 사물인터넷 장치 증가와 관련 서비스의 급속한 확산, 기존의 수직적인 사물인터넷 서비스 구조로부터 수평적인 개방형 생태계로의 변화 추세에 따라 oneM2M, AllSeen, Open Interconnect Consortium(OIC)과 같은 표준협의체 및 산업체 컨소시엄을 중심으로 개방형 사물인터넷 플랫폼 규격 제정 및 오픈 소스 생태계 구축을 위한 노력이 지속되고 있다. 특히 다양한 사물인터넷 장치로부터 데이터를 수집하여 정보를 생성하고, 이종 장치 간의 정보 공유, 분산협업 및 실행제어 기술을 제공하는 사물인터넷 플랫폼은 사물인터넷 서비스 확산을 위한 핵심기술이라 할 수 있다. 본고에서는 오픈 생태계를 지향하는 AllSeen/AllJoyn, OIC/IoTivity, oneM2M 사물인터넷 소프트웨어 플랫폼의 표준화 동향을 살펴보고, 플랫폼의 핵심 기술에 대한 비교 분석을 통해 주요 기술개발 동향를 살펴보고자 한다.

• Journal of Information Technology Services
• /
• v.1 no.1
• /
• pp.67-80
• /
• 2002

This study aims to explore the ways of reinforcing the competitive edge and substance of company through e-business in furniture industry by presenting the e-business model of furniture industry which faces the opportunity of challenge in the course of industrial restructuring. e-business model can take various types depending on the environment, feature and competitive edge that each company faces. For example, it is general in the fields of manufacturing company to study the model by dividing into Sell Side for sales to the customers, and Buy Side for purchase of raw materials, Integrating both sides. In furniture industry, Sell Side has the feature of giving a priority in the quality and price rather than brand image in the purchase type of consumer. Especially, it shall not be overlooked that majority of furniture is delivered to the consumer indirectly through the construction company. As such, e-business should be promoted in a way to expand the point of contact for consumers, rather than to construct its own point of contact for consumers. The percentage of importation of raw lumber is high and the standardization was insufficient in Buy Side.