Recognizing the transportation modes of people's daily living is an important research issue in pervasive computing. Prior this field mainly uses Global Positioning System (GPS), for Mobile Communications (GSM) or their combination with accelerometer to recognize modes, such as walking, driving, etc. In paper, we will introduce mode recognition on mobile phones only using embedded accelerometer. order deal uncertainty position and orientation phone, acceleration synthesization based method...

Sink mobility has attracted much research interest in recent years because it can improve network performance such as energy efficiency and throughput. An energy-unconscious moving strategy is potentially harmful to the balance of consumption among sensor nodes so aggravate hotspot problem networks. In this paper, we propose an autonomous for mobile sinks data-gathering applications. our solution, a sink approaches with high residual force them forward data other tries avoid passing by low...

In this letter, an analytical model is proposed for 3-channel-based neighbor discovery in Bluetooth Low Energy (BLE) networks. The can be used to determine some important performance metrics, such as average latency or energy consumption during the course of discovering neighbors. Since intermittent connections are frequently encountered practical scenarios BLE, modeling results provide a beneficial guidance customize advertising scanning behavior towards user desired performance.

Bluetooth Low Energy (BLE) is drawing more and attention due to its recent appearance in consumer electronic products. As a low-power wireless solution, BLE provides attractive energy performance that makes it particularly suitable for portable, battery-driven devices. Although there are some prior arts focusing on performance, still lacks thorough study the important aspect of device discovery. Such cost, introduced by intermittent scanning or connection setup, could seriously affect...

Bluetooth Low Energy (BT LE) is a low power air interface technology recently released by the Special Interest Group SIG). As promising radio, BT LE realizes many designing features to fulfill foreseeable requirements of short range communication, such as fast device discovery, power-saving transmitting, encryption and authentication, etc. In this paper, we focus on modeling performance analyzing discovery process in networks. A general model for multi-channel proposed primarily, which then...

The resources especially energy in wireless sensor networks (WSNs) are quite limited. Since nodes usually much dense, data sampled by have redundancy, aggregation becomes an effective method to eliminate minimize the number of transmission, and then save energy. Many applications can be deployed WSNs various sensors embedded nodes, packets generated heterogenous or different attributes. from cannot aggregated. Otherwise, most schemes employ static routing protocols, which dynamically...

Bluetooth Low Energy (BLE) is a newly emerged technology targeting at low-power, low-cost wireless communications within medium or short range. Since BLE well designed in favor of Wireless Body Area Networks (WBANs) Personal (WPANs), fast network access has been considered an important issue for users. This paper studies the performance about device discovery particularly with multiple devices. An analytical model developed, based on classical ALOHA analysis, consideration three advertising...

Recently, the content-based publish/subscribe (pub/sub) paradigm has been gaining popularity in opportunistic mobile networks (OppNets) for its flexibility and adaptability. Since nodes OppNets are controlled by humans, they often behave selfishly. Therefore, stimulating selfish to collect, store, share contents efficiently is one of key challenges. Meanwhile, guaranteeing freshness also a big problem content dissemination OppNets. In this paper, order solve these problems, we propose an...

(2N+1) selective harmonic elimination pulse-width modulation (SHE-PWM) is an effective switching strategy of the modular multilevel converter in medium-voltage cases. In these cases, number sub-modules (SMs) not high. Compared to traditional (N+1) SHE-PWM, SHE-PWM has N more voltage levels, thus it can yield much better performance. However, task also becomes complicated since there are angles be determined. This paper proposes a differential harmony search algorithm (DHS) with novel...

This paper proposes a novel fault-tolerant strategy for the operation of modular multilevel converters after submodule (SM) faults, which combines dc injection, neutral shift (NS), and balanced zero-sequence voltage injection (BZVI). A new method to calculate injected is proposed, greatly simplifies calculation enables combination BZVI with NS. The resulted has stronger capability than previous ones: First, it increases maximum redundancy limit SM faults under unnecessary decrease line...

In this paper, we develop a smart phone-based driving behavior evaluation system, named Join Driving, which helps drivers notice how aggressive their behaviors are and be aware of the riding comfort level passengers. The proposed system is made two parts: events detection part part. part, first presents model to detect drivers' events, based on data collected from acceleration, orientation GPS sensors in phones. Then, detected Driving implements novel scoring mechanism quantitatively...

Introducing heterogeneous mobile devices, such as phones into the large scale sparse wireless sensor networks is a promising research direction. These devices acting sinks offer many benefits to network. For instance, they help improve scalability, maintain load balance, conserve energy, prolong network lifetime and implement commercially. The paper investigates impacts of different features behavior on hybrid networks. Analysis simulation results show that, instead deploying much possible,...

Considering sensor nodes deployed densely and uniformly in the sensing field, we focus on a scenario that mobile sink moving through field queries specific area or point of interest for data collection. A Query packet is injected by routed to area, then corresponding Response returned via multi-hop communication. Due mobility sink, should have different routes. We analyze such network model address problem efficient collection wireless networks propose an Query-Based Data Collection Scheme...

Digital ecosystems (DEs) are based on a large amount of distributed data, and these data gathered from physical devices, particularly wireless sensor networks (WSNs). Due to the inherent stringent bandwidth energy constraints, energy-efficient mechanisms performance measurement key proper operation WSNs thereby important for reliability DEs. This paper presents novel algorithm, i.e., Loss Inference Passive Measurement (LIPM), infer WSN link loss performance. The LIPM algorithm passively...

Capacitor voltage balancing is one of the most important issues for safe, reliable, and economical operation modular multilevel converter (MMC). This article proposes a modified individual capacitor method MMCs with phase-shifted carrier pulsewidth modulation (PWM) (CPS-PWM) to solve problem poor dynamic performance that conventional methods suffer at low output power. In proposed method, information arm current incorporated into algorithm cancel out coupling effect power on control....

Wireless Sensor Networks (WSNs) are embracing an increasing number of real-time applications subject to strict delay constraints. Utilizing the methodology potential field in physics, this article we effectively address challenges routing WSNs. In particular, based on a virtual composite field, propose Potential-based Real-Time Routing (PRTR) protocol that supports using multipath transmission. PRTR minimizes for traffic and alleviates possible congestions simultaneously. Since bounds flows...

Pole-to-pole dc short circuit fault blocking capability is a major concern when modular multilevel converters (MMCs) are applied in high voltage direct current (HVDC) transmission systems. Traditional MMCs based on half-bridge submodules (HBSMs) cannot block the current, thus needing expensive breakers (DCCBs). There improved submodule topologies that can faults, but usually with significantly increased device cost. This paper proposes an HBSM-based MMC (HB-MMC) which needs fewer extra...

In this paper, we exploit the geographic opportunistic routing (GOR) for QoS provisioning with both end-to-end reliability and delay constraints in wireless sensor networks (WSNs). Recent work exploits multipath to guarantee WSNs. However, approach suffers from a significant energy cost. We also find that existing GOR protocol may not be suitable WSNs, due large computation at each hop. To improve efficiency of study problem efficient multiconstrained which can formulated as multiobjective...

SUMMARY In asynchronous duty‐cycled wireless sensor networks , it is desirable that the data forwarding scheme adaptive to dynamics caused by uncertainty of nodes’ working schedules. Contention‐based designed adapt dynamic environments. this work, we are interested in contention‐based geographic (CGF) for two duty‐cycling (ADC) models, which refer as uninterruptible ADC (U‐ADC) and interruptible (I‐ADC). We propose a new residual time‐aware routing metric CGF I‐ADC model present using...

Mobility has been incorporated into wireless sensor networks in recent years order to improve energy efficiency and network coverage. In particular, at the cost of increased message delivery delay, conservation can be achieved by limiting hop count between communicating sensor-sink pair. this paper we allow multihop routing one mobile sinks, consider delay*energy metric, which is a compound metric evaluate performance diverse data collection schemes. Through extensive simulation experiments...

Energy efficient multicast routing is one of the fundamental problems in wireless sensor networks (WSNs). Previous work has shown that when goal to find trees with minimum transmission cost, problem becomes NP-complete. In this work, we present a heuristic distributed protocol (MTMRP) for WSNs. By introducing biased backoff scheme and taking advantage broadcast nature communication, MTMRP chooses forwarding routes which can connect more receivers. Moreover, introduces path handover scheme,...