• The KIPS Transactions:PartD
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• v.15D no.1
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• pp.131-138
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• 2008

This paper describes the implementations of the first application service based on embedded Linux; Mobile Teller which uses WiBro network for data communications and CDMA network for voice communications. Currently, with the appearance of WiBro service, dual-mode terminals which support two heterogeneous networks are available. But, the development of applications which effectively use these networks for providing better service to user is rarely prepared. At Mobile Teller, when a sender on a dual-mode terminal types texts, the texts are transmitted to a TTS server located in the Internet through WiBro network. Subsequently, the TTS server converts the texts into voices and transmits the voice data to the dual-mode terminal. At last the dual-mode terminal sends the voice to the receiver through the CDMA network. In case of noisy environment or when a user has difficulty in speaking, Mobile Teller makes voice communication possible

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.7
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• pp.1332-1340
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• 2007

This paper describes an efficient hardware design of key wrap/unwrap algorithm for security layer of WiBro system. The key wrap/unwrap core (WB_KeyWuW) is based on AES (Advanced Encryption Standard) algorithm, and performs encryption/decryption of 128bit TEK (Traffic Encryption Key) with 128bit KEK (Key Encryption Key). In order to achieve m area-efficient implementation, two design techniques are considered; First, round transformation block within AES core is designed using a shared structure for encryption/decryption. Secondly, SubByte/InvSubByte blocks that require the largest hardware in AES core are implemented by using field transformation technique. As a result, the gate count of the WB_KeyWuW core is reduced by about 25% compared with conventional LUT (Lookup Table)-based design. The WB_KeyWuW con designed in Verilog-HDL has about 14,300 gates, and the estimated throughput is about $16{\sim}22-Mbps$ at 100-MHz@3.3V, thus the designed core can be used as an IP for the hardware design of WiBro security system.

• Asia Marketing Journal
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• v.7 no.2
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• pp.71-92
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• 2005

Given the rapid changes in consumer tastes, technology, and competition, companies must develop a steady stream of new products and services. To be a successful product or service and explore the available market, the target market consumers need to be fully acknowledged a new product or service's value or benefit. And at the same time, the presented benefit should satisfy the customer's needs and wants. Therefore, a firm must investigate the target consumers' needs and wants before launching the new product or service. In this paper, we suggest the marketing strategy for newly developed WiBro service in telecommunication industry. We focus on consumer-oriented marketing strategy as well as the technology development process. To explore the customer's value scheme, we employ a self-explicated approach for estimating the customer's part-worth of the different target market in the process of market development stage. And we present the marketing strategy for each market development stages as well.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.7 s.361
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• pp.71-80
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• 2007

This paper describes an efficient hardware design of WiBro security processor (WBSec) supporting for the security sub-layer of WiBro wireless internet system. The WBSec processor, which is based on AES (Advanced Encryption Standard) block cipher algorithm, performs data oncryption/decryption, authentication/integrity, and key encryption/decryption for packet data protection of wireless network. It carries out the modes of ECB, CTR, CBC, CCM and key wrap/unwrap with two AES cores working in parallel. In order to achieve an area-efficient implementation, two design techniques are considered; First, round transformation block within AES core is designed using a shared structure for encryption/decryption. Secondly, SubByte/InvSubByte blocks that require the largest hardware in AES core are implemented using field transformation technique. It results that the gate count of WBSec is reduced by about 25% compared with conventional LUT (Look-Up Table)-based design. The WBSec processor designed in Verilog-HDL has about 22,350 gates, and the estimated throughput is about 16-Mbps at key wrap mode and maximum 213-Mbps at CCM mode, thus it can be used for hardware design of WiBro security system.

• 정보화사회
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• s.182
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• pp.44-46
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• 2006

국내 업체들의 해외시장이 활발해지고 있다. 그동안 해외시장 진출이 없었던 것은 아니지만 최근 이들은 통신업계 심장부에 직접 진출하는 개가를 올리고 있다. 삼성전자가 와이브로로 스프린트와 손잡은 것이 대표적이라면, SK텔테콤이 차세대 통신 중심지인 중국 시장에서 차이나유니콤과 협력하기로 한 것도 빼놓을 수 없다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.204-204
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• 2006

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.653-653
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• 2006

• Digital Contents
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• no.8 s.159
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• pp.37-47
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• 2006

올여름 통신 서비스시장이 그 어느때보다 뜨겁게 달아 오르고 있다. KT, SKT 등유∙무선통신사업자들이 앞다퉈 신규 서비스들을 선보이기 시작했기 때문이다. 지난 5월 SK텔레콤의 HSDPA 서비스인<3G 플러스>를 필두로, 와이브로, TV포털 등 차세대통신 서비스들이 잇달아 상용화에 들어갔다. 무더위와 지긋지긋한 장마로 지칠대로 지친 이번여름, 차세대통신서비스가 가져다 주는 색다른 즐거움에 빠져 더위를 식혀보자.

• Digital Contents
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• no.11 s.162
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• pp.60-63
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• 2006

CDMA2000ㆍW-CDMAㆍ와이브로ㆍ와이맥스ㆍFTTHㆍBcNㆍHSDPAㆍDMBㆍRFIDㆍZigBeeㆍ블루투스 등등 우리는 숱한 통신 관련 용어 속에서 살고 있다. 정보통신 세상은 신기술을 함축해 표현하는 용어의 탑으로 이루어진 것처럼 느껴지고, 한순간 간과하고 지내다 보면 어느새 쫓아 올라갈 수 없을 만큼 높아짐을 새삼 느끼게 한다. 이번 호에서는 정보통신 환경에 대한 이야기를 하려고 한다. 디지털콘텐츠 및 서비스를 제공하기 위해서는 통신인프라가 반드시 필요하다. 통신인프라의 발전상을 훑어보면서 앞으로 접근할 서비스와 콘텐츠에 대해 생각해 볼 기회를 가져보려 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.7A
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• pp.686-693
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• 2007

In this paper, we describe how to set up/down step-size in open loop power control for WiBro reverse link. Since open loop power control does not use feedback information, it is difficult to efficiently use wireless resource with accurate power control. We also provides a method of estimating levels of noise and interference. With numerical investigation, asymmetric up/down power-control step-size is shown to be promising to achieve high sector throughput as well as low error rate.