• Title, Summary, Keyword: Video Call

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The Design and Implementation of an Emergency Video Call Integrated Management System based on VoIP (VoIP기반 승강기 비상 화상통화 통합 관리 시스템 설계 및 구현)

  • Kim, Woon-Yong;Kim, SoonGohn
    • Journal of the Korea Convergence Society
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    • v.8 no.12
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    • pp.93-99
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    • 2017
  • The elevator system combines various convergence technologies with the development of ICT technology. Emergency call devices which are safety related devices is applied as an obligation of the elevator and those scope also varies. In this paper, we propose an integrated model that overcomes the limitations of existing voice emergency call devices and efficiently manages and manages video call based service structures in VoIP based on wired and wireless environments. This method effectively manages and operates various lift data and video records in the elevator between the manager, the server and the user. And also It is possible to secure the quality of video call in VoIP and cloud service environment and increase the reliability of safety management and enhance various service environment by creating an integrated structure utilizing various data and additional services in the elevator.

An efficient signaling protocol for point-to-point multi-connection call in B-ISDN (B-ISDN에서 점 대 점 다중연결 호를 위한 효율적인 신호프로토콜)

  • 배상재;조현철;주언경
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.12
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    • pp.1-9
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    • 1997
  • The signaling protocol for B-ISDN should support variety of services including point-to-pont single-connection call, point-to-point multi-connection call and point-to-multipoint connection call. an efficient signaling protocol for point-to-point multi-connection call based on ITU-T Recommendation Q.298X is presented in this paper. Sequential establishment of madatory and optional connections and common routing scheme for synchronization, along with separation of information elements for establishement of multi-connection call are included in the proposed signaling protocol. Limited network resources can be used more efficiently by proposed sequential establishement of mandartory and optional connection for point-to-point multi-connection call which can provide multimedia services. And common routing can be provided effectively by proposed common routing scheme for connectios requiring synchronization like as video-phone and video-conference.

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Extracting Graphics Information for Better Video Compression

  • Hong, Kang Woon;Ryu, Won;Choi, Jun Kyun;Lim, Choong-Gyoo
    • ETRI Journal
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    • v.37 no.4
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    • pp.743-751
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    • 2015
  • Cloud gaming services are heavily dependent on the efficiency of real-time video streaming technology owing to the limited bandwidths of wire or wireless networks through which consecutive frame images are delivered to gamers. Video compression algorithms typically take advantage of similarities among video frame images or in a single video frame image. This paper presents a method for computing and extracting both graphics information and an object's boundary from consecutive frame images of a game application. The method will allow video compression algorithms to determine the positions and sizes of similar image blocks, which in turn, will help achieve better video compression ratios. The proposed method can be easily implemented using function call interception, a programmable graphics pipeline, and off-screen rendering. It is implemented using the most widely used Direct3D API and applied to a well-known sample application to verify its feasibility and analyze its performance. The proposed method computes various kinds of graphics information with minimal overhead.

A new IP-based Multi-Channel Elevator Video Surveillance System (IP 기반의 다채널 엘리베이터 영상감시 시스템)

  • Shin, Jea-Hung;Kim, Hong-Ryul
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.62 no.4
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    • pp.164-168
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    • 2013
  • Recently, in the elevator of the buildings, such as apartment and office building, the visitor monitoring cameras for surveillance, advertising LCD to provide a variety of information, emergency call devices, and safe driving information sensors are installed. A variety of multimedia data from these devices to the central control office, management office, or to guard room are transmitted in real-time. Each sub-systems in the elevator are installed with a separate lines and operated independently and use different management principals, so integrated management for each sub-systems are very difficult. In this study, we develop a new IP-based multi-channel video surveillance system which is integrated surveillance camera, emergency call devices, communications devices, various sensors in the elevator, DVR, ODM, and can manage all devices by two-way communication and integrated interface. And we evaluated the performance of the developed system.

Call Admission Control using Soft QoS-based Borrowing Scheme in DVB-RCS Networks (DVB-RCS 망에서 Soft-QoS 기반의 Borrowing 기법을 사용한 호 수락 제어)

  • Lee, Hee-Bong;Jang, Yeong-Min;Lee, Ho-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.2A
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    • pp.61-65
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    • 2005
  • We propose a soft QoS-based borrowing scheme for call admission control(CAC) in DVB-RCS(Digital Video Broadcast-Return Channel via Satellite). Some of the ongoing calls temporarily and fairly release bandwidths that can be used to accommodate a new call in an overloaded satellite network. The amount of bandwidth borrowed from each call is proportional to each user's critical bandwidth ratio, one of parameters for soft QoS mechanism. Simulation results show that the proposed scheme improves the system performance in terms of call blocking probability and bandwidth utilization.

Implementation of a Video Conference Server with Additive Video-Stream (부가 영상 삽입기능을 갖는 화상회의 서버 구현)

  • 권성환;성영락;오하령
    • Proceedings of the IEEK Conference
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    • pp.101-104
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    • 2000
  • In this paper, we implement a video conference system, which connects remote PCs. Each system receives video and audio data from devices attached to a PC and compresses them by using CODECs. It sends the compressed data to the opponent. Compared to the existing ones, the proposed system can combine two video streams into a new one. Thus, additional video data can be transferred to the opponent during a call.

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User Experience Research about Mobile Video Call in Four Countries (4 개국 사용자들의 모바일 화상전화 사용 경험 조사)

  • Yi, Sun-Young;Hwang, Byeong-Cheol
    • 한국HCI학회:학술대회논문집
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    • pp.85-90
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    • 2007
  • 세계 이동 통신 시장은 점차 3G(세대)~3.5G(세대)로 전환되면서 세대 교체하고 있다. 3G 이동 통신의 대표 서비스인 화상전화는 음성통화와는 다른 새로운 커뮤니케이션이나 여러 가지 원인으로 일반화되지 않고 있는데, 그 원인 중 하나가 새로운 사용 경험과 사용 환경이 충분히 고려되지 않은 UI 라고 생각된다. 따라서, 본 조사에서는 한국, 일본, 영국, 이탈리아 등 4 개국을 대상으로 현재 출시된 화상전화 제품에 대하여 실사용자 FGI 와 설문, In-depth interview 등을 통해 사용자들의 화상전화 사용 경험을 조사하고, 조사를 통한 발견점을 통해 UI 설계 전문가 관점에서 향후 UI 에 대한 제안점을 찾아 보다 나은 화상전화 경험을 제공하기 위한 바탕으로 삼고자 한다.

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Smart Mobile Blackbox DVR in Car Environment (자동차 환경에서 스마트 모바일 블랙박스 DVR)

  • Choi, Sun-O;Kim, Young-Po;Im, Yong-Soon;Kim, Young-Ja;Kang, Eun-Young
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.13 no.5
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    • pp.9-15
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    • 2013
  • In this paper, automatic recognition of an accident and whether service delivery and risk driving through the giving of the driver to correct driving habits before and after the accident to reproduce highly scalable video Smart Mobile Blackbox DVR (SMBD, Smart Mobile Blackbox DVR) Computer of the model was designed. SMBD on embedded systems equipped with wireless capabilities to sleep in the car accident point and the image information by wireless communications, by notification in the control center, 24-hour emergency rescue service and traffic information can be provided. The vehicle ECU (Electronic Control Unit) of the vehicle information and sensor data in conjunction with wireless eCall (Emergency Call) services can be realized.

Preconsent Video-Assisted Instruction Improves the Comprehension and Satisfaction in Elderly Patient Visiting Pain Clinic

  • Kim, Sung-Hoon;Koh, Won-Uk;Rhim, Jin-Ho;Karm, Myong-Hwan;Yu, Hye-Suk;Lee, Bo-Yoeng;Shin, Jin-Woo;Leem, Jeong-Gill
    • The Korean Journal of Pain
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    • v.25 no.4
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    • pp.254-257
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    • 2012
  • Background: Elderly patients visiting pain clinic may be at greater risk of misunderstanding the explanation because of age-related cognitive decline. Video instruction may provide a consistent from of teaching in a visual and realistic manner. We evaluated the effect of educational video on the patient understanding and satisfaction in a group of geriatric patients visiting pain clinic. Methods: Ninety two patients aged more than 60 years old who were scheduled for transforaminal epidural block were recruited. After exposure to either video or paper instruction process, each patient was asked 5-item comprehension questions, overall satisfaction and preference question. During follow-up period, number of outpatient referral-line call for further explanation was counted. Results: We observed significantly better comprehension in the video education compared with paper instruction (P < 0.001). Patient satisfaction was also higher in the video group (P = 0.015), and patients visiting pain clinic were more preferred video instruction (P < 0.001). Proportion of referral-line call for further explanation were similar (P = 0.302). Conclusions: Video approach to instruction process before consent improves treatment comprehension in geriatric patient visiting pain clinic.

A Dynamic Bandwidth Allocation and Call Admission Control Method for Quality of Service Control of VBR Video Traffic

  • Yoo, Sang-Jo;Kim, Seong-Dae
    • Proceedings of the IEEK Conference
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    • pp.27-30
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    • 2000
  • In this paper, we propose a new dynamic bandwidth allocation and call admission control method for the VBR video sources with QoS constraints to provide user's quality of service requirements and at the same time to achieve an efficient resource management in networks. The proposed mechanism dynamically adjusts the necessary bandwidth by the networks based on the provided quality of service satisfaction degree of each connection in respect to the user's requirements in terms of loss ratio and average delay Simulation results show that our proposed dynamic method is able to provide the desired level of quality of service and high utilization.

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