• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.11
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• pp.2374-2380
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• 2011

Many people is preferred to mVoIP which offers call telephone-quality and convenient UI as well as free of charge. On the other hand, security of mVoIP is becoming an issue as it using Internet network may have danger about wiretapping. Although traditionally encryption algorithm of symmetric key for security of voice data has been used, ECC algorithm of public key type has been preferring for encryption because it is stronger in part the strength of encryption than others. However, the existing way is restricted by lots of operations in poor mobile environment. Thus this paper proposes the efficiency of resource consumption way by reducing cryptographic operations.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.4
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• pp.758-763
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• 2005

Currently, the communication between land and sea using Inmarsat terminal can communicate telephone, telex, fax, e-mail, data transmission. The exist e-mail program between land and sea has developed to reduce communication fee because of high satellite communication coast and low speed. In case of fax service has defect of paper, out-time, high cost. In this paper, we describes the design of fax service system based on Internet for land and sea. This fax system has been integrate e-mail system function and existing fax system function. For this purpose, the hardware module has connect e-mail system and PSTN.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.6
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• pp.1454-1461
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• 2014

This study analyzes the influence of the logistics quality of Chinese internet shopping mall on the customer satisfaction. This study also analyzes the influence of the customer satisfaction on the word-of-mouth intention. Then this study examines whether there is a difference among the influences of the logistics quality on the customer satisfaction depending on the types of shopping mall and the users' traits. As a result, when it comes to the logistics quality, carriage, after service and kindness influence customer satisfaction and the customer satisfaction influences word-of-mouth intention similarly. And this research reveals that the logistics quality can not differently influence on the customer satisfaction depending on the types of shopping mall and the users' gender and ages.

• Journal of the Korea Society of Computer and Information
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• v.16 no.7
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• pp.165-172
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• 2011

This study was to investigate which factors promote the usage of WiBro service, and to propose a few of research propositions on the relationships between these factor and characteristics of mobile Internet usage. To accomplish these research purposes, the study defined research variables such as factors promoting the usage of WiBro service, characteristic of mobile Internet usage, and types of user based on the review of mobile Internet service related studies. The study performed various statistical analyses using survey questionnaires on mobile Internet users, and finally proposed some research propositions, based on the analysis results, that could be used in the future studies.

• 한국정보통신설비학회:학술대회논문집
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• 2005.08a
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• pp.124-127
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• 2005

국내에서는 언제 어디서나 휴대용 단말을 이용하여 저렴한 요금으로 고속의 무선인터넷을 사용할 수 있는 휴대인터넷 서비스를 2006년부터 서비스 할 계획이다. 앞으로 서비스 될 WiBro 휴대인터넷 서비스 방식은 기존 이동통신 방식과 달리 RF 송신 주파수와 수신 주파수가 동일한 TDD (time division duplexing) 방식을 사용한다. WiBro 무선통신 기지국 장비에 있어서도 기존 CDMA 이동통신 기지국 장비에서와 마찬가지로 RF Power Amplifier (PA)가 매우 고가의 핵심 부품이라 할 수 있다. 물론, 기존 FDD (frequency division duplexing) 방식의 CDMA 기지국 PA와 달리 WiBro용 기지국 PA는 TDD 신호를 처리할 수 있는 새로운 기술을 필요로 한다. TDD 방식인 WiBro 기지국용으로 사용할 수 있는 새로운 2.3 GHz 42 W PA를 설계, 제작한 결과를 본 논문에서는 발표하고자 한다.

• Journal of KIISE:Software and Applications
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• v.35 no.3
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• pp.197-206
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• 2008

In the mobile Internet environment, frequent communications between a mobile device and a content server are required for searching or downloading learning materials. In this paper, we propose an efficient prefetching technique to reduce the network cost and to improve the communication efficiency in the mobile dictionary. Our prefetching-based approach can be explained as follows. First, we propose an overall framework for the prefetching-based mobile dictionary. Second, we present a systematic way of determining the amount of prefetching data for each of packet-based and flat-rate billing cases. Third, by focusing on the English-Korean mobile dictionary for middle or high school students, we propose an intuitive method of determining the words to be prefetched in advance. Fourth, based on these determination methods, we propose an efficient prefetching algorithm. Fifth, through experiments, we show the superiority of our prefetching-based method. From this approach, we can summarize major contributions as follows. First, to our best knowledge, this is the first attempt to exploit prefetching techniques in mobile applications. Second, we propose a systematic way of applying prefetching techniques to a mobile dictionary. Third, using prefetching techniques we improve the overall performance of a network-based mobile dictionary. Experimental results show that, compared with the traditional on-demand approach, our prefetching based approach improves the average performance by $9.8%{\sim}33.2%$. These results indicate that our framework can be widely used not only in the mobile dictionary but also in other mobile Internet applications that require the prefetching technique.

• Journal of Internet Computing and Services
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• v.21 no.5
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• pp.9-20
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• 2020

This study redefines the networks' connection behaviors and the terms confusion over the settlement in Netflix-SK Broadband's dispute through domestic and foreign legal references. Conflict parties, academics and the media use the terms "interconnection fee" or "Access fee" without uniformity, and in some cases mixes for strategic purposes. The use of different terms for the same phenomenon (or vice versa) has a high need for research in that it makes it difficult to reach a unified approach to the problem, to discuss it productively and rationally, and, moreover, to resolve disputes. Therefore, this study cross-referenced/analyzed terms related to network utilization and connectivity, namely "Use", "Access", "Interconnection" and thus cost-related terms as a counter-pay. In addition, it suggests that interconnection fees and access fees should be used separately, and allows them to function as a starting point in resolving future ICT sector issues. As a result of this study, the price against the network access/use between Netflix and SK Broadband is access fee or retail price, and proposes to be used uniformly in the term "interconnection fee" only for fees incurred in interconnection between ISPs that possess or operate networks.

• 한국공간정보시스템학회:학술대회논문집
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• 2001.11a
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• pp.287-303
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• 2001

지리정보의 중요성이 널리 인식되고 사회 각 분야에서 지리정보에 대한 수요가 날로 증가되고 다양해지고 있지만 GIS의 개발, 설치, 유지, 보수의 어려움에 따른 고가의 비용과 시장에 대한 적응력부족으로 GIS의 광범위한 활용이 저해 받고 있는 실정이다. 또한, 개인을 위한 GIS 서비스나 응용프로그램의 하나의 기능 컴포넌트로서의 GIS 서비스가 GIS의 주류로 발전할 것으로 예측되고 있지만 이를 지원하기 위한 GIS 개발, 배포 모델과 기반기술이 결여되어 있다. 그러나, 사용자가 월 정액요금을 지불하고 인터넷 또는 인트라넷을 통하여 ASP (Application Service Provider)에 의해 원격 중앙 서버에 설치, 관리되고 있는 소프트웨어 응용프로그램을 사용하는 형식은 혁신적인 소프트웨어 개발과 배포 모델로서 차세대 컴퓨터 환경의 기초로 각광 받고 있으며 이를 GIS에 적용할 때 GIS의 광범위한 응용과 원활한 유통을 크게 추진할 것으로 기대된다. 그러므로, 현시점에서 GIS ASP를 위한 합리적인 모델과 이에 근거한 소프트웨어 플랫폼에 대한 연구와 개발이 절실히 필요하다. 본 논문에서는 ASP 환경 하에서 더욱 신속하고 편리한 GIS 개발, 통합, 배포를 가능하게 하고 보다 나은 질의 GIS ASP 서비스를 제공하기 위하여 마이크로소프트의 ASP 플랫폼인 .NET 기반의 3 계층 GIS ASP 모델을 중심으로 하는 GIS ASP 소프트웨어 플랫폼의 설계를 제시하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.441-444
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• 2006

통신기술의 급격한 발전, 유비쿼터스에 대한 시장수요 증가, 신규 시장창출을 위한 비즈니스 전략이 결집되어 유무선 융합의 패러다임이 전개되고 있으며 유선의 전송속도와 무선의 이동성을 결합한 와이브로는 유무선 융합을 주도할 서비스로 부각되고 있다. 2006년 상반기에 상용화 될 예정인 와이브로가 안정적인 가입자 기반으로 조기에 시장확산을 이루기 위해서는 동시기에 출시될 HSDPA에 비하여 차별적 지위를 확보하고 기존 서비스와의 관계를 정립하기 위한 포지셔닝 전략이 요구된다. 이에 본 연구에서는 소비자 설문조사를 통해 와이브로의 시장수요를 HSDPA와의 관계 분석을 바탕으로 전망하며 기존 서비스와의 대체 또는 보완 관계를 파악하여 와이브로의 시장위상을 예측하였다. 분석결과 첫째, 잠재적 이용자가 인식하는 와이브로의 서비스 역량은 HSDPA에 비하여 전송속도와 이용요금에서 차별적 우위를 나타냈으며 둘째, 와이브로는 HSDPA에 비하여 가입자 규모에서 상대적인 우위를 보였으며 두 서비스의 가입 영향요인은 상이하였다. 마지막으로 와이브로는 초고속인터넷과는 보완 관계를, 이동전화 무선인터넷과 공중 무선랜과는 대체 관계를 형성하는 것으로 나타났다.

• Journal of Korea Game Society
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• v.6 no.1
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• pp.21-28
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• 2006

This study focused on design and implementation of Mobile 3D Bluetooth Engine based on OpenGL-ES. In Mobile 3D network game so far, there is a form the mainstream of wireless internet game using WAP and VM. But, VM game are popular because of an excessive communication expense problem for this mobile network game that occur when connect to wireless internet as point out to problem by it, that is, stand-alone game are very popular. This study introduce a mobile 3D Bluetooth Engine which is based on mobile 3D standard using OpenGL-ES to solve a mobile network game generally that occurs when connect to take pleasure a wireless internet from some people into a short distance.