To support bursty traffic on the Internet (and especially WWW) efficiently, optical burst switching (OBS) is proposed as a way to streamline both protocols and hardware in building the future generation Optical Internet. By leveraging the attractive properties of optical communications and at the same time, taking into account its limitations, OBS combines the best of optical circuit-switching and packet/cell switching. In this paper, the general concept of OBS protocols and in particular, those based on Just-Enough-Time (JET), is described, along with the applicability of OBS protocols to IP over WDM. Specific issues such as the use of fiber delay-lines (FDLs) for accommodating processing delay and/or resolving conflicts are also discussed. In addition, the performance of JET-based OBS protocols which use an offset time along with delayed reservation to achieve efficient utilization of both bandwidth and FDLs as well as to support priority-based routing is evaluated.

Optical burst switching (OBS) - a new paradigm for an optical Internet

Multicast stream authentication and signing is an important and challenging problem. Applications include the continuous authentication of radio and TV Internet broadcasts, and authenticated data distribution by satellite. The main challenges are fourfold. First, authenticity must be guaranteed even when only the sender of the data is trusted. Second, the scheme needs to scale to potentially millions of receivers. Third, streamed media distribution can have high packet loss. Finally the system needs to be efficient to support fast packet rates. We propose two efficient schemes, TESLA and EMSS, for secure lossy multicast streams. TESLA (Timed Efficient Stream Loss-tolerant Authentication), offers sender authentication, strong loss robustness, high scalability and minimal overhead at the cost of loose initial time synchronization and slightly delayed authentication. EMSS (Efficient Multi-chained Stream Signature), provides nonrepudiation of origin, high loss resistance, and low overhead, at the cost of slightly delayed verification.

/pdf/efficient-authentication-and-signing-of-multicast-streams-lqwph0d614.pdf

Efficient authentication and signing of multicast streams over lossy channels

Most perceptions of interactivity are that it is an inherently good thing, that it will change marketing and advertising as we know it. However, though there are obvious and intuitive advantages to interactivity, it may pose a disadvantage for marketing and advertising in some conditions. In this article, we explore the nature of interactivity and its underlying processes to determine the conditions in which interactivity may be both useful and detrimental in an advertising context. We first discuss the multidimensional nature of the interactivity construct as it has appeared in the literature. We then provide a concrete conceptualization and definition of interactivity that encompasses these various dimensions. We argue that inconsistencies between the definitions and operationalizations found in previous studies make it difficult to draw firm conclusions about the role of interactivity but that these inconsistencies can be at least partly explained by a focus on the different dimensions of inte...

https://www.jstor.org/stable/pdfplus/4189237.pdf

What Is Interactivity and Is It Always Such a Good Thing? Implications of Definition, Person, and Situation for the Influence of Interactivity on Advertising Effectiveness

Recommendation agents (RAs) are software agents that elicit the interests or preferences of individual consumers for products, either explicitly or implicitly, and make recommendations accordingly RAs have the potential to support and improve the quality of the decisions consumers make when searching for and selecting products online They can reduce the information overload facing consumers, as well as the complexity of online searches Prior research on RAs has focused mostly on developing and evaluating different underlying algorithms that generate recommendations This paper instead identifies other important aspects of RAs, namely RA use, RA characteristics, provider credi'r, and user-RA interaction, which influence users' decision-making processes and outcomes, as well as their evaluation of RAs It goes beyond generalized models, such as TAM, and identifies the RA-specific features, such as RA input, process, and output design characteristics, that affect users' evaluations, including their assessments of the usefulness and ease-of-use of RA applications

Based on a review of existing literature on e-commerce RAs, this paper develops a conceptual model with 28 propositions derived from five theoretical perspectives The propositions help answer the two research questions: (1) How do RA use, RA characteristics, and other factors influence consumer decision making processes and outcomes? (2) How do RA use, RA characteristics, and other factors influence users' evaluations of RAs? By identifying the critical gaps between what we know and what we need to know, this paper identifies potential areas of future research for scholars It also provides advice to information systems practitioners concerning the effective design and development of RAs

E-commerce product recommendation agents: use, characteristics, and impact

Map-matching is the process of aligning a sequence of observed user positions with the road network on a digital map. It is a fundamental pre-processing step for many applications, such as moving object management, traffic flow analysis, and driving directions. In practice there exists huge amount of low-sampling-rate (e.g., one point every 2--5 minutes) GPS trajectories. Unfortunately, most current map-matching approaches only deal with high-sampling-rate (typically one point every 10--30s) GPS data, and become less effective for low-sampling-rate points as the uncertainty in data increases. In this paper, we propose a novel global map-matching algorithm called ST-Matching for low-sampling-rate GPS trajectories. ST-Matching considers (1) the spatial geometric and topological structures of the road network and (2) the temporal/speed constraints of the trajectories. Based on spatio-temporal analysis, a candidate graph is constructed from which the best matching path sequence is identified. We compare ST-Matching with the incremental algorithm and Average-Frechet-Distance (AFD) based global map-matching algorithm. The experiments are performed both on synthetic and real dataset. The results show that our ST-matching algorithm significantly outperform incremental algorithm in terms of matching accuracy for low-sampling trajectories. Meanwhile, when compared with AFD-based global algorithm, ST-Matching also improves accuracy as well as running time.

/pdf/map-matching-for-low-sampling-rate-gps-trajectories-4hstm6zk4l.pdf

Map-matching for low-sampling-rate GPS trajectories

Methods and system for locating network services with distributed network address translation. Digital certificates are created that allow an external network device on an external network, such as the Internet, to request a service from an internal network device on an internal distributed network address translation network, such as a stub local area network. The digital certificates include information obtained with a Port Allocation Protocol used for distributed network address translation. The digital certificates are published on the internal network so they are accessible to external network devices. An external network device retrieves a digital certificate, extracts appropriate information, and sends a service request packet to an internal network device on an internal distributed network address translation network. The external network device is able to locate and request a service from an internal network device. An external network device can also request a security service, such as an Internet Protocol security ("IPsec") service from an internal network device. The external network device and the internal network device can establish a security service (e.g., Internet Key Exchange protocol service). The internal network device and external network device can then establish a Security Association using Security Parameter Indexes ("SPI") obtained using a distributed network address translation protocol. External network devices can request services, and security services on internal network devices on an internal distribute network address translation network that were previously unknown and unavailable to the external network devices.

Method and system for locating network services with distributed network address translation

A method and apparatus for providing prepaid billing on a data network for wireless prepaid services, which includes a network-access device, such as a network access server or PDSN, that requests from a network-access-control device, such as a AAA server, network access for one or more wireless communication sessions. In response to the request for network access, the network-access device receives from the network-access-control device a block of credits and at least one measurement-method parameter. After being granted network access, the network-access device establishes session activity for the wireless communication sessions. The network-access device periodically measures usage of the session activity for the wireless communication session and then debits the usage of the session activity from the block of credits. When the remain credits in the block of credits reach a predetermined threshold, the network-access device requests from the network-access-control device an additional block of credits. In responsive to this request, the network-access device receives from the network-access-control device the additional block of credits, if available credits remain in a cache of available credits from which the blocks are withdrawn. The network-access-control device may also receive the measurement-method parameters. The network-access device then debits the usage of the session activity for the wireless communication session from the additional block of credits. At some predetermined threshold and responsive to an authorization to purchase credits, credits may be added to the cache of available credits. During this process, the ongoing wireless communication session may be redirected to a redirect device.

Prepaid billing system for wireless data networks

We discuss the architecture and technical viability of transporting real-time voice over packet-switched networks such as the Internet. The value of integrating voice and data networks onto a common platform is well known. The telephony industry has proposed the ATM standard as a means of upgrading the Internet to provide both real-time and data services. In contrast, voice services may be added to traditional IP networks that were originally designed for data transmission alone. We consider the feasibility and expected quality of service of audio applications over IP networks such as the Internet. In particular, we examine possible architectures for voice over IP and discuss measured Internet delay and loss characteristics.

Real-time voice over packet-switched networks

A protocol and methods for peer network device discovery is presented. The peer discovery protocol includes a peer discovery marker than can be used with an existing networking protocol such as Transmission Control Protocol (“TCP”) to discover peer network devices. The peer discovery protocol also includes a peer discovery table to record network addresses of peer network devices and their associated host network devices. The peer discovery method allows a first peer network device such as an edge router, to send out a peer discovery request with the peer discovery protocol to other peer network devices as the peer network device is sending data packets for a host network device. Once a second peer network device receives a peer discovery request, the second peer network device attempts to establish a two-way, peer-to-peer data-flow to the first peer network device that sent the peer discovery requests. The peer discovery protocol and methods allow error correction, encryption, compression and other “intelligent” services to be added to peer network devices such as edge routers. The peer discovery protocol and peer discovery methods may enhance performance, reliability and security of data transmitted over the Internet to and from Autonomous Systems, subnets, or other computer networks.

Protocol and method for peer network device discovery

A method and system for distributed network address translation with security features. The method and system allow Internet Protocol security protocol (“IPsec”) to be used with distributed network address translation. The distributed network address translation is accomplished with IPsec by mapping a local Internet Protocol (“IP”) address of a given local network device and a IPsec Security Parameter Index (“SPI”) associated with an inbound IPsec Security Association (“SA”) that terminates at the local network device. A router allocates locally unique security values that are used as the IPsec SPIs. A router used for distributed network address translation is used as a local certificate authority that may vouch for identities of local network devices, allowing local network devices to bind a public key to a security name space that combines a global IP address for the router with a set of locally unique port numbers used for distributed network address translation. The router issues security certificates and may itself be authenticated by a higher certificate authority. Using a security certificate, a local network device may initiate and be a termination point of an IPsec security association to virtually any other network device on an IP network like the Internet or an intranet. The method and system may also allow distributed network address translation with security features to be used with Mobile IP or other protocols in the Internet Protocol suite.

Michael S. Borella

Papers

Method and system for locating network services with distributed network address translation

Prepaid billing system for wireless data networks

Real-time voice over packet-switched networks

Protocol and method for peer network device discovery

Method and system for distributed network address translation with network security features