• Title/Summary/Keyword: 통신장애

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Factors Influencing the Market Diffusion and Marketing Strategy of WCDMA Service (국내 WCDMA 서비스의 시장확산과 마케팅전략 영향요인)

  • Kim Moon-Koo;Park Jong-Hyun;Nam Changi
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.8B
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    • pp.569-580
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    • 2005
  • In case of one of the next generation mobile telecommunication; WCDMA service, the relevant market growth is delayed by market uncertainty, lack of effective demands, rapid evolution of technology, non-existence of business strategy, lack of distinction with competitive services and killer applications. In this study we intended to analyze the influence factors of market diffusion and marketing strategy of WCDMA. For doing so, we obtained both promotion and hindrance factors for diffusing the market of WCDMA through expert survey. Also we acquired such categories as factor for adoption, willingness to pay, killer application, preferred terminal and pronising customer, which becomes the reason ifluencing on the decision of WCDMA service marketing strategy. On the basis of such results, this paper suggests the direction of deployment for marketing focusing on the strategies as customer, price, sewice, terminal provision, and positioning of WCDMA.

Older Adults' Experience of Smart-home Healthcare System (노인의 스마트 홈 헬스케어 이용 경험)

  • Lee, Young-Joo;Lee, JuHee;Nah, Ji-Young
    • The Journal of the Korea Contents Association
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    • v.15 no.5
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    • pp.414-425
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    • 2015
  • Purpose: This study was conducted to explore the experience of smart-home healthcare among older adults who had participated in the smart-home technology development project. Methods: Data were collected by focus group interviews with 7 hypertension or diabetes participants(mean age 75 years). Qualitative contents analysis was used to analyze the verbal data. Results: The results were composed of 27 meanings units, 10 categories and 6 themes. The 6 themes are: 'improvement of health conditions through anytime anywhere self-monitoring', 'attractive experience to be counselling at home', 'frequent system and telecommunication problems', 'unfamiliar devices for elderly users', 'complementary strategies for activation', 'advancement of elderly-friendly devices and programs'. Conclusion: The smart-home healthcare system should be developed based on older adults' preferences. It is essential to make progress with professional resources and organizational supports in the future.

Distributed Server based Data Management and Device Control Scheme for Efficient IoT Service in Smart Building (스마트 빌딩에서의 효율적인 사물인터넷 서비스를 위한 분산 서버 기반 데이터 관리 및 제어 기법)

  • Choi, Sang-Il
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2017.05a
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    • pp.547-550
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    • 2017
  • With the deployment of Internet of Things (IoT) services, the interest of smart building management system is rapidly increased. However, existing smart building management system has some limitations such as single point of failure, scalability, processing delay by using the centralized service platform server. To overcome these limitations, in this paper, the distributed server based smart building management scheme is proposed. In the proposed scheme, it is possible to provide fast and efficient IoT services, regardless of the scale of smart building, by using the distributed server of each floor. From the numerical analysis, it is shown that the proposed scheme provides better performance than the existing centralized scheme in terms of stability of database and service processing delay.

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Design of a GCS System Supporting Vision Control of Quadrotor Drones (쿼드로터드론의 영상기반 자율비행연구를 위한 지상제어시스템 설계)

  • Ahn, Heejune;Hoang, C. Anh;Do, T. Tuan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.10
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    • pp.1247-1255
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    • 2016
  • The safety and autonomous flight function of micro UAV or drones is crucial to its commercial application. The requirement of own building stable drones is still a non-trivial obstacle for researchers that want to focus on the intelligence function, such vision and navigation algorithm. The paper present a GCS using commercial drone and hardware platforms, and open source software. The system follows modular architecture and now composed of the communication, UI, image processing. Especially, lane-keeping algorithm. are designed and verified through testing at a sports stadium. The designed lane-keeping algorithm estimates drone position and heading in the lane using Hough transform for line detection, RANSAC-vanishing point algorithm for selecting the desired lines, and tracking algorithm for stability of lines. The flight of drone is controlled by 'forward', 'stop', 'clock-rotate', and 'counter-clock rotate' commands. The present implemented system can fly straight and mild curve lane at 2-3 m/s.

A Study on the Sentence Generation using Lexical Information (어휘정보를 이용한 문장작성에 관한 연구)

  • 황인정;민홍기
    • Journal of the Institute of Convergence Signal Processing
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    • v.5 no.3
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    • pp.198-204
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    • 2004
  • This study suggests a sentence generating method to help those who have language impediment with their communication. The method suggested in this study was constructed into a system in order to be applied to AAC system. AAC system is a personal portable device that generates sentences. Those who have language impediment need another communication method, causes inconvenience when used in a conversation with those who don't have the same trouble. The method of inputting both consonants and vowels can be inconvenient and time consuming for a conversational communication because of the number of the key strokes. The lexical information for the sentence generating of this study defines the user's domain, collects the adequate words and sentences, and extracts and classifies the characteristics of the collected words. The comparison between the number of key strokes for sentence generating using the system and that of inputting consonants and vowels using a keyboard was made in order to evaluate the usefulness the sentence generating method.

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Design and Implementation of large Beacon Monitoring System (대형등명기 모니터링 시스템 설계 및 구현)

  • Kim, Ji-Hoon;Ye, Seong-Hyeon;Han, Soonhee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.10
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    • pp.2516-2522
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    • 2014
  • Our country has a convoluted coastline and the marine weather fluctuates locally, so it needs effective AtoN operation for the safe navigation of vessels and fishing boats sailing the coast. Especially, large beacon must ensure the safety of the vessels and always lit at night. If large beacons installed in the lighthouse are not lit, vessels can not assure their location. Thus the accidents is likely to occur, which can cause great economic damage. In this paper, we developed a monitoring system of large beacon to monitor and control the status of information. This system was designed for a special purpose of taking precautions against possible accidents on the sea.

Sign Language Recognition Using ART2 Algorithm (ART2 알고리즘을 이용한 수화 인식)

  • Kim, Kwang-Baek;Woo, Young-Woon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.5
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    • pp.937-941
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    • 2008
  • People who have hearing difficulties use sign language as the most important communication method, and they can broaden personal relations and manage their everyday lives without inconvenience through sign language. But they suffer from absence of interpolation between normal people and people who have hearing difficulties in increasing video chatting or video communication services by recent growth of internet communication. In this paper, we proposed a sign language recognition method in order to solve such a problem. In the proposed method, regions of two hands are extracted by tracking of two hands using RGB, YUV and HSI color information from a sign language image acquired from a video camera and by removing noise in the segmented images. The extracted regions of two hands are teamed and recognized by ART2 algorithm that is robust for noise and damage. In the experiment by the proposed method and images of finger number from 1 to 10, we verified the proposed method recognize the numbers efficiently.

A Repository Utilization System to optimize maintenance of IIoT-based main point Utilities (IIoT 기반한 핵심유틸리티의 유지보수 최적화를 위한 공동 활용 시스템)

  • Lee, Byung-Ok;Lee, Kun-Woo;Kim, Young-Gon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.21 no.5
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    • pp.89-94
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    • 2021
  • Recently, manufacturing companies are introducing many intelligent production processes that apply IIoT/ICT to improve competitiveness, and a system that maintains availability, improves productivity, and optimizes management costs is needed as a preventive measure using environmental data generated from air ejectors. Therefore, in this study, a dedicated control board was developed and LoRa communication module was applied to remotely control it to collect and manage information about compressors from cloud servers and to ensure that all operators and administrators utilize common data in real time. This dramatically reduced M/S steps, increased system operational availability, and reduced local server operational burden. It dramatically reduced maintenance latency by sharing system failure conditions and dramatically improved cost and space problems by providing real-time status detection through wired and mobile utilization by maintenance personnel.

A Convergence Technology of IPTV-RFID against Clone Attack (Clone 공격에 강한 IPTV-RFID 융합 기술)

  • Jeong, Yoon-Su;Kim, Yong-Tae;Park, Gil-Cheol;Lee, Sang-Ho
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.20 no.2
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    • pp.145-156
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    • 2010
  • Now a days, the development of TV and internet like communicational technique makes IPTV service which combines internet with multimedia contents increase. But when a user gets service in specific place, the certification process and user's ID check in IPTV service is complicate so that there occurs communicational difficulty like increasing illegal users and service delay etc. This paper proposes communication security mechanism to prevent Clone attack which happens in wireless section by efficiently extracting illegal user. The proposed mechanism performs key distribution procedure, inter certification procedure, and key initiation procedure by putting security agent in RFID-USB for RFID tags users use to perform plug-and-plug function. Also, the proposed mechanism updates the hased token value by its ID and the random number which RFID-USB creates whenever a user accesses in the area of RFID-USB so that it protects reply attack and man-in-the-middle attack which happen often in the area of wireless section.

A Development of Telephone for the Hearing Impaired to Improve Listening Ability of Telephone Speech (난청인의 통화 청취도 향상을 위한 전화기 개발)

  • 이상민;송철규;이영묵;김원기
    • Journal of Biomedical Engineering Research
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    • v.18 no.4
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    • pp.457-466
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    • 1997
  • We developed a new hearing aid telephone which helps the hearing impaired person to improve the listening ability of telephone speech. Recently, the hearing impaired person and the elderly who has hearing loss have been continuously increased and their desire for participating society as a producer has been increased also. So they strong1y want the hearing aid devices which make compensation fortheir handicap. The hearing aid telephone is one of the basic aid devices that helps the hearing impaired to communicate well with other poeple and to acquire easily useful information through the phone. We analyze the hearing ability of the hearing impaired, design the new model of the hearing aid telephone and test the telephone in three fields-electrical, word perception, user test. Our new tolephone has lour band pass filter channels and the center frequencies of these filters are 500, 1000, 2000, 3000Hz which are considered psychoacoustic factors and telephone line characteristics. The hearing impaired can adjust the total gain characteristics of receiving sound to his hearing ability by setting four volumes in the telelphone. This procedure is called fitting which is a very important factor for the hearing impaired to take meaning of speech. The total gain of this telephone is over 20dB from 250Hz to 3200Hz range. From the results of the tests we certify that our new model is better for the hearing impaired to understand the meaning or telephone speech than the old general models. The next step of developing the hearing aid telephone is to study about compressing sidetone and noise, dividing frequency bands, selecting hearing aid pattern and compensating psychoacoustic loudness. we expect that the advanced hearing aid telephone can be developed by the research about speech perception characteristics of the hearing impaired in engineering and clinical side.

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