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Multiple Devices (multiple + device)

Distribution by Scientific Domains

Information Science and Computing	40%

Selected Abstracts

Shrinkability Maps for Content-Aware Video Resizing

COMPUTER GRAPHICS FORUM, Issue 7 2008
Yi-Fei Zhang
Abstract A novel method is given for content-aware video resizing, i.e. targeting video to a new resolution (which may involve aspect ratio change) from the original. We precompute a per-pixel cumulative shrinkability map which takes into account both the importance of each pixel and the need for continuity in the resized result. (If both x and y resizing are required, two separate shrinkability maps are used, otherwise one suffices). A random walk model is used for efficient offline computation of the shrinkability maps. The latter are stored with the video to create a multi-sized video, which permits arbitrary-sized new versions of the video to be later very efficiently created in real-time, e.g. by a video-on-demand server supplying video streams to multiple devices with different resolutions. These shrinkability maps are highly compressible, so the resulting multi-sized videos are typically less than three times the size of the original compressed video. A scaling function operates on the multi-sized video, to give the new pixel locations in the result, giving a high-quality content-aware resized video. Despite the great efficiency and low storage requirements for our method, we produce results of comparable quality to state-of-the-art methods for content-aware image and video resizing. [source]

Comparisons between impulse voltage calibrators and digitizers

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, Issue 3 2006
Takayuki Wakimoto Member
Abstract Comparisons between impulse calibrators and digitizers are useful in determining the uncertainties of the instruments, especially when multiple devices are being cross compared. In this paper, comparisons between calibrators and digitizers from NIT, Japan and NMI, Australia are reported. Comparisons of full lightning impulse and switching impulse waveforms were performed. The results of the comparisons are reported with an analysis of the sources of the uncertainties. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [source]

Advanced IMS client supporting secure signaling

BELL LABS TECHNICAL JOURNAL, Issue 4 2008
Ramana Isukapalli
With recent advances in core and access networks and the availability of increased bandwidth and sophisticated devices for end users, there is an increased demand for client applications running on mobile devices, such as laptops and handheld devices, to support real time applications like Voice over Internet Protocol (VoIP) and streaming video, apart from traditional applications like web browsing. This paper presents a prototype IP Multimedia Subsystem (IMS) client, which serves as a VoIP client to set up calls between Internet Protocol (IP) devices and interworks with circuit-switched networks to deliver calls to public switched telephone network (PSTN) phones. It implements supplementary services (including call waiting, call transfer, and call forwarding); supports multimedia ringing, short message service/multimedia messaging service (SMS/MMS), audio/video conferencing, and peer-to-peer video; and it can deliver a call to a user (as opposed to a device) by simultaneously ringing multiple devices registered by the user. Further, to address various security concerns, the client supports Hypertext Transfer Protocol (HTTP) digest authentication using Message Digest 5 (MD5) cryptographic function authentication and key agreement (AKA) and can create secure tunnels to the core network using IP security (IPsec). © 2008 Alcatel-Lucent. [source]

Transcatheter closure of high-risk muscular ventricular septal defects with the CardioSEAL occluder: Initial report from the CardioSEAL VSD Registry

CATHETERIZATION AND CARDIOVASCULAR INTERVENTIONS, Issue 5 2007
D. Scott Lim MD
Abstract Objectives: The CardioSEAL VSD registry was created to track safety of the device to close high-risk Ventricular Septal Defect (VSD). Background: This is the first report from the multi-centered CardioSEAL VSD registry reviewing demographics and initial results. Methods: Centers recruited patients with VSD who were high-risk for surgery due to medical condition or anatomic features. Results: 18 centers contributed data on 55 high-risk patients who had 61 VSD-occlusion procedures, with age of range of 5 days to 65 years and using one to six devices. Implantation approach was transvenous in 48, perventricular in five, and by combined approach in two patients. Ninety-two percent of intended VSD device implants were judged successful. Twenty-two patients had single VSD closed by single device in 18 and by two devices in four patients. All patients <8 kg underwent perventricular device implantation. Thirty-three patients had multiple VSDs which were closed by a single device in 23, and multiple devices in 10. At discharge echocardiography showed total residual flow through all VSDs in which devices were used was classified as "Small" or less in 74%, "More than small" in 11%, and "Uncertain" in 15%. Eight major adverse events occurred in 5/61 cases (8% event rate), with 3/81 devices embolized (4% embolization rate), 5/81 devices surgically explanted (6% explant rate), and no deaths judged to be procedure-related. Conclusion: This initial report from the multi-centered CardioSEAL VSD registry demonstrates the safety of the device to close high-risk VSDs. © 2007 Wiley-Liss, Inc. [source]

Transcatheter closure of coronary artery fistulae using the Amplatzer duct occluder

CATHETERIZATION AND CARDIOVASCULAR INTERVENTIONS, Issue 2 2006
Sarina K. Behera MD
Abstract Objective: The aim of this study is to report our experience using the Amplatzer Duct Occluder (ADO) for occlusion of significant coronary artery fistulae (CAF). Background: Transcatheter closure of CAF with coils is well described. Use of newer devices may offer advantages such as improved control of device placement, use of a single instead of multiple devices, and high rates of occlusion. Methods: A retrospective review of all patients catheterized for CAF from July 2002 through August 2005 was performed. Results: Thirteen patients with CAF underwent cardiac catheterization, of which a total of 6 patients had ADO placement in CAF (age, 21 days to 56 years; median age, 4.3 years and weight, 3.8 kg to 74.6 kg; median weight, 13.3 kg). An arteriovenous wire loop was used to advance a long sheath antegrade to deploy the ADO in the CAF. Immediate and short-term outcomes (follow-up, 3 months to 14 months; median follow-up, 8.5 months) demonstrated complete CAF occlusion in 5 patients and minimal residual shunt in 1 patient (who had resolution of right atrial and right ventricular enlargement). On follow-up clinical evaluation, all 6 patients had absence of fistula-related murmurs, and 2 previously symptomatic patients had resolution of congestive heart failure symptoms. Early complications included transient palpitations and atrial arrhythmia in the 2 oldest patients (52 and 56 years old). Conclusions: Use of the ADO is applicable for transcatheter closure of significant CAF. Advantages of using the ADO include the antegrade approach, use of a single device, and effective CAF occlusion. © 2006 Wiley-Liss, Inc. [source]