Responding to the increasing interest to connect wireless sensor networks (WSN) to the Internet, the IETF has proposed standards that enable IPv6-based sensor networks. Specifically, the IETF 6LoWPAN and RoLL working groups developed standards for encapsulating IPv6 datagrams in 802.15.4 frames, neighbor discovery, and routing that allow sensor networks to exchange IPv6 datagrams with Internet ...

Many wireless sensor networks (WSNs) for medical, military, and control applications require strong security protection of messages. Yet, the algorithms and protocols used must be efficient in space and time due to the constrained resources of sensor devices. Existing link-layer security solutions for WSNs, such as SPINS [3] and TinySec [2]), rely on software-level encryption and authentication...

Wireless sensor networks (WSNs) contain multiple nodes of the same configuration and type. The biggest challenge nowadays is to communicate with heterogeneous nodes of different WSNs. To communicate with distinct networks, an application requires generic middleware. This middleware should be able to translate the requests for contrary WSNs. Most of the wireless nodes use the TinyOS or Contiki o...

A popular model of asynchronous programming consists of a singlethreaded worker process interacting with a task queue. In each step of such a program, the worker takes a task from the queue and executes its code atomically to completion. Executing a task can call “normal” functions as well as post additional asynchronous tasks to the queue. Additionally, tasks can be posted to the queue by the ...

With the advent of latest sensing technologies, agricultural tasks can be performed so quickly andadequately and termed Smart agriculture. In this paper, a system based on sensor networks has been designed tomonitor parameters wirelessly. The proposed deployed in Wheat field. aim workis to increase quality productivity crops minimize extensive field visits farmers. Thissystem enables precision ...

آلیاژهای منیزیم معمولاً دارای عدم تقارن تسلیم در حالت کشش و فشار هستند که این عامل ناشی از سازوکارهای مختلف تغییر شکل پلاستیک فعال تحت بارگذاری‌های کششی فشاری است. مقاله بر روی شبیه‌سازی المان حجمی نماینده‌ی سه‌بعدی آلیاژ اکسترود شده تمرکز دارد تا با کمک روابط کریستال پلاستیسیته تأثیر شدت بافت پایه ـ را بررسی کند. پلاستیسته مبتنی‌بر لغزش به‌صورت یک زیربرنامه نرم‌افزار آباکوس (U‌M‌A‌T) برای آزمون...

There have been a number of recent proposals for link and network-layer protocols in the sensor networking literature, each of which claims to be superior to other approaches. However, a proposal for a networking protocol at a given layer in the stack is typically evaluated in the context of a single set of carefully selected protocols at other layers, as well as a particular network topology a...

One problem with existing store-and-query sensor networks is that they fail to take data and query rates or network topology information into account. This leads to expensive (and avoidable) communication overhead that reduces the lifespan of battery-powered sensor networks. Scoop reduces this overhead (up to a factor of four in our experiments) by dynamically creating and adapting an in-networ...

In the paper, we propose an energyefficient communication protocol, called Scheduling-based Low duty cycle Energy Efficient Protocol (SLEEP). The proposed protocol ensures that a node wakes up at specific times and transmits only when the receiving node is awake to receive a message, while ensuring that the channel capacity is fairly distributed among participating nodes. The protocol is simple...

In this paper, we present a static analysis by Abstract Interpretation of device drivers developed in the TinyOS operating system, which is considered as the de facto system in wireless sensor networks. We focus on verifying user-defined functional properties describing safety rules that programs should obey in order to interact correctly with the hardware. Our analysis is sound by construction...