We introduce Mosaic, a mobile sensor network system for city scale sensing. Currently, we focus on accurate PM2.5 measurements. design and implement low-cost smart sensors this purpose. Those are specifically designed moving vehicles such as buses taxies. The sensing capability of our enables wide coverage with modest number sensors. incorporate three-layer architecture in Mosaic. Mosaic faces many practical challenges which need to be properly addressed, e.g., reliable node hardware...

In wireless sensor networks, nodes are usually self-organized, delivering data to a central sink in multi-hop manner. Reconstructing the per-packet routing path enables fine-grained diagnostic analysis and performance optimizations of network. The performances existing reconstruction approaches, however, degrade rapidly large scale networks with lossy links. this paper, we propose Pathfinder, robust method against packet losses as well dynamics. At node side, Pathfinder exploits temporal...

Wireless link correlation can greatly affect the performance of wireless protocols such as flooding, and opportunistic routing. Researchers have proposed a variety approaches to optimize existing exploiting correlation. Most works directly measure using packet-level transmissions receptions. Measurement alone is insufficient because it lacks predictive power scalability. In this paper, we present CorModel, model for predicting in low-power networks. Based on underlying causes correlation,...

Rapid development is essential for IoT (Internet of Things) application developers to obtain first-mover advantages and reduce the cost. In this paper, we present TinyLink, a holistic system rapid applications. The key idea TinyLink use top-down approach designing both hardware software Developers write code in C-like language specify logic their applications, without dealing with details specific components. Taking as input, automatically generates configuration well binary program...

Developing and experimenting IoT applications are still difficult time-consuming, mainly due to their heterogeneous hardware diverse software. Testbeds useful for developers test the performance of before deploying them fields. In this paper, we present LinkLab (http://linklab.emnets.org), a scalable testbed devices. Compared with existing testbeds, not only supports running experiments but also remote development via web-based IDE compiling. Therefore, is able improve efficiency...

The recent years have witnessed the rapid growth of IoT (Internet Things) applications. A typical application usually consists three essential parts: device side, cloud and client side. development a complete is very difficult for non-expert developers because it involves drastically different technologies complex interactions between sides. Unlike traditional platforms which use separate approaches these sides, we present TinyLink 2.0, an integrated approach with single coherent language....

Many IoT applications have the requirements of conducting complex events processing (e.g., speech recognition) which are hardly supported by low-end devices due to limited resources. Most existing approaches enable event on statically allocating tasks edge or cloud. In this paper, we present Queec, a QoE-aware computing system for under dynamic workloads. With that relative computation-intensive can be transparently offloaded nearby nodes at runtime. We formulate problem scheduling...

Rapid development is essential for IoT (Internet of Things) application developers to obtain first-mover advantages and reduce the cost. In this article, we present TinyLink, a holistic system rapid applications. The key idea TinyLink use top-down approach designing both hardware software Developers write code in C-like language specify logic their applications, without dealing with details specific components. Taking as input, automatically generates configuration well binary program...

Many IoT applications have the requirements of conducting complex events processing (e.g., speech recognition) that are hardly supported by low-end devices due to limited resources. Most existing approaches enable event on statically allocating tasks edge or cloud. In this article, we present Queec, a QoE-aware computing system for under dynamic workloads. With relatively computation-intensive can be transparently offloaded nearby nodes at runtime. We formulate problem scheduling multi-user...

Rapid prototyping of IoT platforms is essential for developers to obtain first-mover advantage, validate feasibility innovative ideas and the key technologies. In this paper, we present TinyLink, an approach rapid cost-effective platforms. With can specify platform functionalities let TinyLink deal with details hardware components. Then creates user constraints from functionalities, as well inherent constraints. The high level goal automatically select components so that they satisfy...

Mosaic is a low-cost sensing system for city scale air quality monitoring. able to monitor with low costs by deploying customized sensors on moving vehicles. Objectives of this demo are show how our work and present the three-layer monitoring system. Details about node design can be found in [1] which will presented INFOCOM technical sessions.

TinyLink is a holistic system for rapid development of IoT applications. It adopts top down approach both hardware and software designs Taking the application code as input, automatically generates configuration well binary executable on targeted platform. Objective this demo to present how are generated, assemble components, burn validate functionalities.

The thermal compression test of the nanocrystalline, as-extrusion and as-cast pure Mg was carried out by AGX-XD universal testing machine. results demonstrated that flow stress with different grain sizes decreased increasing temperature decreasing strain rate. Accurate prediction deformation behavior achieved through establishing constitutive equations. In comparison, nanocrystalline represents stronger hardening rate weaker sensitivity to Based on processing map, optimal area for is at...

Recent years, the rapid development of Internet Things (IoT) technologies and applications have been witnessed. Three important features are characterized in modern IoT applications: 1) device heterogeneity; 2) long-range communication; 3) cloud/edge-device integration. Difficulties raised by above toward application developers, e.g., predicting evaluating performance entire system. To deal with difficulties, we design implement an simulator, TinySim, which satisfies requirements high...

Grain size of GW103K Mg alloy powder were markedly refined to about 45 nm from 20 μm by an optimized hydrogenation-disproportionation-desorption-recombination (HDDR) process. By changing temperature, hydrogen pressure and time, the optimum hydrogenation conditions are explored orthogonal design. Then complete dehydrogenation process was determined using single factor control variables. Furtherly, HDDRed spark plasma sintering (SPS) sintered hot extruded prepare bulk. XRD, OM, scanning...

Modern IoT applications are characterized by three important features, i.e., the device heterogeneity, long-range communication and cloud-device integration. The above features cause difficulties for application developers in predicting evaluating performance of entire system. To tackle difficulties, we design implement an simulator, TinySim, which satisfies requirements high fidelity, scalability, interactivity. Many virtual devices can be simulated TinySim at PC end. These send or receive...

Wireless personal area networks (WPANs) are drawing more and attention recently, specially with the proposal of high rate technologies for its physical (PHY) layer. Multiband orthogonal frequency division multiplexing (MB-OFDM) ultra wideband (UWB) direct-sequence (DS) UWB two proposed PHY-layer in WPANs. Coexistence issue aforementioned while operating simultaneously collocated WPANs, is a matter concern, as they may induce mutual interference. In this paper, we address channel estimation...

The recent years have witnessed the rapid growth of IoT (Internet Things) applications. A typical application usually consists three essential elements: device side, cloud side and client side. development a complete is very difficult because it involves drastically different technologies complex interactions between sides. In this demo, we present OneLink, which integrates device, in single piece code. OneLink provides coherent C-like programming language for developers model that separates...