The delivery of the discharge note to the general practitioners following discharge of elderly patients from a geriatric medical unit was studied over a two-month period. Handwritten discharge notes were received by the general practitioners in 75% of cases, and the delay was reduced to a median of two days by the use of a pre-printed envelope. Postal communications were also received by 89% of...

This paper addresses the problem of the evaluation of the packet delay delivery distribution via analytical means in a multihop wireless network. We assume that the wireless network operates with the IEEE 802.11 MAC protocol and implements the Optimal Link State Routing (OLSR) protocol [4]. The routing protocol is a table driven protocol that updates topology information via periodic broacast c...

We present an efficient message delivery framework, called MeDeHa, which enables communication in an internet connecting heterogeneous networks that is prone to disruptions in connectivity. MeDeHa is complementary to the IRTF’s Bundle Architecture: besides its ability to store messages for unavailable destinations, MeDeHa can bridge the connectivity gap between infrastructure-based and multi-ho...

Macro-programming is the new generation advanced method of using Wireless Sensor Network (WSNs), where application developers can extract data from sensor nodes through a high level abstraction of the system. Instead of developing the entire application, task graph representation of the WSN model presents simplified approach of data collection. However, mapping of tasks onto sensor nodes highli...

Recent work shows sink mobility can improve the energy efficiency in wireless sensor networks (WSNs). However, data delivery latency often increases due to the speed limit of mobile sink. In practice, some application has strict requirements on delay. This paper focuses on the path selection problem in delay-guaranteed sensor networks with a path-constrained mobile sink. The optimal path is cho...

In this paper, initial simulations are presented showing that the upcoming IEEE 802.11p standard is not suitable for traffic safety applications requiring reliable, low-delay communication between vehicles. The medium access control procedure is one of the most important parts in the design of delay-constrained communication systems, and emerging vehicle safety applications put new stringent de...

Low density of network nodes in Vehicular Ad Hoc Networks (VANETs) outside the rush hours and in peripheral areas limits usability of traditional ad hoc networking, which requires end-to-end connectivity between communicating parties. In this article, we survey how usability of vehicular networks could be escalated with delay-tolerant networking, in which vehicles store and carry network data w...

Since the packet is transmitted to a set of relaying nodes in opportunistic routing strategy, so the transmission delay and the duplication transmission are serious. For reducing the transmission delay and the duplicate transmission, in this paper, we propose the delay based duplication transmission avoid (DDA) coordination scheme for opportunistic routing. In this coordination scheme, the cand...

Vehicular ad hoc networks (VANET) aims to enhance vehicle navigation safety by providing an early warning system: any chance of accidents is informed through the wireless communication between vehicles. For the warning system to work, it is crucial that safety messages be reliably delivered to the target vehicles in a timely manner and thus reliable and timely data dissemination service is the ...

In underwater acoustic sensor networks (UASNs), energy awareness, best path selection, reliability, and scalability are among the key factors that decide information delivery to sea surface. Existing protocols usually do not combine such performance-affecting in routing. As a result, performance of deteriorates if multiple taken into account. To cope with deterioration, this article proposes tw...