SIP Devices Research Articles

Strategies for avoiding delamination in system-in-packaging devices

Approaches such as the modification of substrate design and the use of different types of underfill/epoxy mold compound were proposed to solve the delamination problem in system-in-packaging devices (SiP). Energy dispersive spectroscopy, scanning electronic and acoustic microscopy were employed to evaluate the proposed changes in device structure. The effects of dispensing and curing temperature as well as of viscosity on the underfill penetration ability under the component region were investigated. It was found that besides the excess of flux residue, the root cause of the delamination/expansion problem in SiP devices submitted to high temperatures is the presence of a large size of voids under the component. The use of a substrate design with cavity under the component region containing two entrances and the application of underfill was considered as a solution of the delamination problem. The reliability of this strategy was confirmed by a large sample size of fabricated devices.

A failure location technology for SiP devices based on TDR nondestructive testing method

PurposeTraditional nondestructive failure localization techniques are increasingly difficult to meet the requirements of high density and integration of system in package (SIP) devices in terms of resolution and accuracy. Time domain reflection (TDR) is recognized as a novel positioning analysis technology gradually being used in the electronics industry because of the good compatibility, high accuracy and high efficiency. However, there are limited reports focus on the application of TDR technology to SiP devices.Design/methodology/approachIn this study, the authors used the TDR technique to locate the failure of SiP devices, and the results showed that the TDR technique can accurately locate the cracking of internal solder joints of SiP devices.FindingsThe measured transmission rate of electromagnetic wave signal was 9.56 × 107 m/s in the experimental SiP devices. In addition, the TDR technique successfully located the failure point, which was mainly caused by the cracking of the solder joint at the edge of the SiP device after 1,500 thermal cycles.Originality/valueTDR technology is creatively applied to SiP device failure location, and quantitative analysis is realized.

Videoconference in education: “Mconf” and “Multipresence” Systems

Abstract: The objective of this paper is to present two low cost videoconference applications being developed in Brazil that can be used also in education: Mconf and Multipresence. Mconf is an open source, distributed, scalable and federated global web conferencing system, interoperable with SIP and mobile devices. The Multipresence system allow interoperation of many technologies to comply with a multitude of devices and communication standards, such as the following: Telepresence room in high definition (Full HD); Ultra-telepresence room in ultra-high definition (UHD 4K); Content sharing among the participants (simultaneous upload, rearrangement and visualization of images, texts and applications); Legacy videoconferencing systems; High definition videoconferencing through a personal computer application program; Web conferencing (web browser); Mobile devices and SIP phones.

Laser-based Package Singulation and Trenching for SiP

Pulsed lasers are solving some packaging challenges for SiP applications. SiP devices designed for mobile devices with communication capability often have a need for EMI shielding. Nanosecond UV and picosecond green lasers are finding use in cutting these multi-compound packages as well as trench for exposing board contacts used for grounding. Mechanical cutting may not be an option if the perimeter of the package is not a simple rectangle. Water jet cutting may bear the risk of the package to fail to to water seeping in between the package layers during cutting. We will demonstrate how laser-based SiP package cutting and trenching can ameliorate both of those concerns and point toward limitations of laser-based processes. Today's high power nanosecond UV lasers are capable of cutting 1mm thick packages at an effective cutting speed of more than 10mm/s. The resulting cut surface shows no charring or melting. The surface roughness allows for excellent adhesion of EMI shielding paint on the cut conformal compound. Since the laser beam can be controlled with a programmable scanner, arbitrary shapes can be cut just as easily as simple rectangles. Difference ablation rates between polymer and copper allow the laser to trench the conformal coating and stop automatically when a metal layer is exposed. This self-terminating process leads to a precise exposure even when the conformal coating thickness differs from part to part. For the utmost in surface quality picosecond lasers can be employed. Their shorter pulse duration allows for an even lower surface roughness and less thermal impact on the package. Using an ultrafast laser, such as a 10ps laser, has the additional advantage that the process scales in speed with increased laser power. The excellent edge quality and possibility to cut random shapes allow laser-based processes to complement mechanical processes in high-end applications. We will present a full cost of ownership model that allows the designer to predict the exact singulation and trenching cost for a given package size.

임베디드 기반의 IMS 코아 SIP 게이트웨이 구현

Abstract IMS(IP Multi-Media Subsystem) is in the limelight as the Integrated wire and wireless Systems because of a sudden increase of smart mobile devices and growth of multimedia additional services such as IPTV. The structure of IMS is designed as a session control layer to provide various multimedia summative service using SIP based on IP communication network in order to carry out set-up, change and release by NGN of course, the existing voice services. But now It is broadly substituting in the IPTV, wire phone company and it is substituted in internet platform base on the soft-switch in currently. Especially, in currently, 4G LTE in a mobile communication company is rapidly growing in market. Therefore, in this study, we had designed and developed to the main prosser that can admit to 1000 user over and SIP gateway which can link the IMS Core that can link SIP Device which adopt the standard protocol on the SIP and to provide variable multimedia services. Key Words : IMS Core, 3GPP, PSTN, CSCF, SIP

임베디드 기반의 IMS 솔루션 설계

Abstract IMS(IP Multi-Media Subsystem) base on the IP service platform which can offer multimedia as the voice, audio, video, and data is service platform. In 3G mobile communication in the early day, IMS had a suggestion for supporting to multimedia service in the 3GPP. But now It is broadly substituting in the IPTV, wire phone company and it is substituted in internet platform base on the soft-switch in currently. Especially nowadays, 4G LTE in a mobile communication company is rapidly growing in market. Therefore, in this study, we had designed to the main prosser that can admit to 1,000 user over and SIP gateway which can link the IMS 코어 that can link SIP Device which adopt the standard protocol on the SIP. Key Words : IMS Core, SIP, CSCF, 3GPP, PSTN * 정회원, 우송대학교 컴퓨터정보학과접수일자 : 2014년 7월 2일, 수정완료 : 2014년 7월 31일게재확정일자 : 2014년 8월 8일Received: 2 July, 2014 / Revised: 31 July, 2014 Accepted: 8 August, 2014 * Corresponding Author: stkim@wsu.ac.krDept. of Information Science & Engineering, Woosong University,Korea

Research on Standard Domain and Non Standard Domain Based on SIP Protocol

SIP protocol is a for the establishment, change and terminate multimedia session control protocol of application layer, based on the analysis of SIP protocol stack, in view of the non SIP video communication field has designed a communication strategy, achieved with the standard SIP domain as well as the standard SIP device and the existing non SIP domain communication, makes SIP protocol is compatible with existing video scheduling system, enhances the use range, avoid re design of non SIP domain, and the validation and application in the bus company project.

SecSIP : un environnement de protection pour la voix sur IP

SecSIP is a framework dedicated to the protection of SIP-based services against attacks emerging from the exploitation of implementation or specification vulnerabilities. SecSIP relies on a stateful model to track advanced protocol event sequences in vulnerability exploitation and describes the counter-measures to prevent exploitation. SecSIP offers a domain-specific language, called VeTo, to specify the protection rules. The language also allows to associate a context to each protection rule against the exploitation of a vulnerability targeting a specific SIP device.

VoIP secure session assistance and call monitoring via building security gateway

AbstractA secure architecture is proposed in the home/office networking environment with a special appliance, called Building Security Gateway (BSG), for cheap SIP devices and unsupported soft user agents (UAs) performing security functions successfully, such as construction of secure sessions and encrypting/decrypting media. Therefore, we apply BSG procedure to VoIP for getting secure session. Furthermore, VoIP call monitoring and intercepting functions are also implemented in BSG. Secure session monitoring is supported in this architecture. A prototype BSG is built in a home/office network, and BSG‐based session mobility cases between UAs are examined and the protocol primitives for security and call intercepting are verified. Copyright © 2010 John Wiley & Sons, Ltd.

Information leak vulnerabilities in SIP implementations

The use of VoIP as a cheaper communications alternative is growing at an astronomical rate. However, potential abuse of the technology may hinder its deployment. One key security concern is the exploitation of implementation vulnerabilities in the form of unauthorized access, worms, viruses, and denial of service attacks, particularly when combined with explicit targeting of implementations that are known to be vulnerable. One way to protect from exploitations of implementation-specific vulnerabilities is security-by-obscurity where a SIP device does not reveal its specific software version. For the same reason, the SIP standard does not encourage announcing the software version in SIP messages. In this article we show that even when SIP messages do not explicitly contain software version information, there is sufficient information leak to determine it. To demonstrate this, we introduce techniques to fingerprint SIP devices and develop a fingerprinting tool called SIPProbe that collects fingerprints and identifies SIP implementations. This type of information leak presents a new security concern as it can be used by malicious users as a building block to scan SIP devices and launch attacks

라이브 비디오 스트리밍을 지원하는 RTC 기반 홈 게이트웨이의 설계 및 구현

본 논문은 흠 내부의 Non-SIP 기반 비디오 카메라로부터 홈 외부의 SIP 기반 단말기로 비디오 스트림을 전송할 수 있는 흠 게이트웨이의 설계 구현에 목적이 있다. 홈 게이트웨이는 OSGi 프레임워크를 기반으로 하였으며 흠 내부의 기기로부터 흠 외부의 이동 중인 모바일 사용자를 연결하기 위해 SIP 스택을 내포하는 마이크로소프트 사의 RTC 기술을 이용하였다. 홈 게이트웨이 상에, SIP 세션의 연결 등을 관리하는 RTC 번들을 개발하였으며, 홈 내부의 Non-SIP 기반 비디오 카메라로부터 비디오 스트림을 읽기 위해 가상 비디오 캡쳐 드라이버를 개발하였다. 최종적으로 설계 구현된 홈 게이트웨이를 테스트하기 위해 SIP 프로토콜을 탑재한 윈도우 메신저를 흠 외부의 단말기로 설정하고 AXIS 2100 UPnP 비디오 카메라를 홈 네트워크에 연결하여 비디오 카메라로부터 이동중인 윈도우 메신저로의 세션 연결과 라이브 비디오의 스트리밍을 실험하고 확인하였다. The objective of this paper lies in the design and implementation of a home gateway supporting live video streaming which flows from the Non-SIP video camera in home to the mobile SIP device outside. We developed the home gateway on the OSGi framework and employed the RTC technology which embeds an SIP stack so that the multimedia session can be established from the home device to the mobile user outside. And also we developed an RTC bundle to manage the session and a virtual capture device driver to read the video stream from the Non-SIP video camera in the home network, and installed them on the home gateway. Finally, we constructed the experimental environment that has the windows messenger as the SIP mobile device and an AXIS 2100 UPnP video camera as a video source, and then tested if the session establishment to the mobile user from the camera and live video streaming work well between them.