Wi-Fi networks are widely deployed for provision of Internet-centric data services. Since the inception network in 1997 with its technical specification rooted IEEE 802.11 standard, much progress higher throughput has been made. Currently popular 802.11n 2.4/5 GHz can deliver 600 Mb/s over a 40 MHz channel, which works well most types services, and later version based on 802.11ac is able to transmit at about 7 Gb/s. A simple configuration consisting an AP multiple stations bidirectional...

Devices used in Internet of Things (IoT) networks continue to perform sensing, gathering, modifying, and forwarding data. Since IoT have a lot participants, mitigating reducing collisions among the participants becomes an essential requirement for Medium Access Control (MAC) protocols increase system performance. A collision occurs wireless channel when two or more nodes try access at same time. In this paper, reinforcement learning-based MAC protocol was proposed provide high throughput...

In Underwater Wireless Sensor Network(UWSN), there are nodes moving by themselves like AUVs(Autonomous Vehicles), or passively currents and other environmental affects. For the passive nodes, normally exists difficulties in estimating nodes' locations. Herein, handover technologies for necessary but researches UWSN barely being processed. Because of characteristics, it is difficult to realize underwater handover. This paper presents model which predicts ocean current specific timelines...

Task-execution times are one of the most important parameters in scheduling tasks. Most algorithms based on assumption that either worst-case task-execution known to scheduler or no information execution is available at all. While tasks can guarantee meet their timing requirements, it may lead severe under-utilization CPUs because could be two orders magnitude larger than corresponding actual values. Scheduling time distribution (instead times) improve system utilization significantly. In...

Lithium-ion batteries are widely used in many applications due to their high energy density, efficiency, and excellent cycle ability. Once an unknown Li-ion battery is reusable, it important measure its lifetime state of health. The most favorable measurement method the test, which accurate but time- capacity-consuming. In this study, instead a we present empirical model based on C-rate test understand health short time. As result, show that partially accelerated charge/discharge condition...

This paper presents an open architecture controller (OAC) for machining systems and describes the OAC testbed at University of Michigan. Because our is designed fully systems, it does not depend on any specific hardware or software components. openness includes reusability which enables integration a wide range monitoring control features. In addition to openness, system provides guaranteed real-time performance, important requirement advanced manufacturing.

Proliferation of all forms low-cost smart devices have boosted the dense deployment wireless local area networks, which causes a number interference to occur. To mitigate effects among users in single cell network, we consider service based on antennae using non-orthogonal multiple access, two can be served simultaneously, and non-overlapping beam pattern enables reuse spatial resources. However, joint optimization access scheme smart-antenna-based allocation system has high computational...

Proliferation of smart internet things (IOTs) devices has boosted the improvement multiple networking functions which have a different capability in terms capacity and access delay. Herein, function IoT should be properly selected to fully utilise capabilities types technologies. In this Letter, reinforcement learning-based self-organising scheme is proposed for IOTs. A node selects an adequate network adapts its topology by learning channel circumstance. To verify performance scheme,...

This paper proposes a multi-channel MAC protocol that provides QoS for ad-hoc networks based on the IEEE 802.11 DCF mode. The standard gives methodologies and examples contention-based distributed coordination systems only single channel. To overcome this limited channel usage, many studies how it works in environment have been performed. 802.11e has proposed priority schemes operate However, we combine concept supporting with protocol. Thus, can achieve advantage of provide real-time users.

Wireless multi-hop sensor networks consist of a wired backbone network, gateway nodes and wireless nodes. To resolve the bottleneck problems in neighborhood node, we propose an effective carrier sensing multiple access algorithm based on distributed alleviation (DiBA) scheme. Using concept relay token, utilize linear distribution as probability density functions for selection backoff counter value, rather than using uniform distribution. From simulation results, show that system throughput...

In any distributed system, messages must be ordered according to their cause-and-effect relation ensure correct behavior of the system. Causal ordering is also essential for services like atomic multicast and replication. real-time systems, not only proper causal ensured, but message deadlines met as well. Previous algorithms which such include /spl Delta/-protocol family MARS approach. However, both these give large response times by delaying all a fixed period time. this paper we show that...

Given the ever-increasing interest in Internet of Underwater Things (IoUT), various studies are ongoing to solve some practical problems affecting development underwater wireless communication. The main related use acoustic waves a water medium, which extremely high propagation loss and drastic channel fluctuation common. On basis hands-on experience measurements made real environments, conventional Adaptive Modulation Coding (AMC), uses correlation between SNR (Signal Noise Ratio) BER (Bit...

Recent research has focused on the optimal current-collector design of a large Mg anode for large-scale Mg-air primary batteries. The study investigated effects different contact points (CCPs) electrochemical discharge performance and degradation anodes. results revealed that selection CCPs plays critical role in improving capacity power characteristics. current values measured at several surface locations varied significantly depending CCP position anode. This nonuniform distribution is...

Inter-cell interference in dense cellular networks causes severe network performance degradation because the base stations (BSs) and devices cannot fully utilize all status information practice. Reinforcement learning enables wireless to find an effective transmission strategy with limited entities operate a distributed manner. We herein propose medium access algorithm based on multi-agent reinforcement by exchanging knowledge of transmissions from other cells. Specifically, state mapping...

Cluster-based wireless sensor network is considered in this paper. In network, every node wants to send data a certain gateway node, or command case of military network. communication enables effective power control, while the budget nodes limited. conventional clustering algorithm, there cluster header which has comparatively large capacity. However, most cases, same and all behave symmetrically. It necessary design based on equivalent condition. paper, we optimal size outage probability...

This paper describes an iterative learning framework consisting of multi-layer prediction processes for underwater link adaptation. To obtain a dataset in real environments, we implemented OFDM (Orthogonal Frequency Division Multiplexing)-based acoustic communications testbeds the first time. Actual data measured Yellow Sea, South Korea, were used training model. Remarkably, model achieves up to 25% performance improvement over conventional benchmark

Several structured peer-to-peer networks have been created to solve the scalability problem of previous systems such as Gnutella and Napster. These which support distributed hash table functionality construct a sort overlay network, can cause topology mismatch between underlying physical network. To this problem, we propose topology-aware hierarchical framework for DHTs. The approach is based on concept that global Internet also architecture, is, network networks. This puts forth two...

기존 자연어처리 분야의 다른 구조를 갖는 심층 신경망들은 같은 말뭉치를 학습했음에도 말뭉치의 특성에 따라 성능을 보여주었다. 학습했을 때 일반적으로 준수한 내는 모델을 찾기 위하여, 본 논문에서는 구성이 자연어 심층신경망에 학습시켜 말뭉치별 심층신경망의 정확도를 다양한 측면에서 비교한다. 실험에 사용한 심층신경망은 CNN과 RNN 그리고 RNN을 합친 모델까지 총 3가지 신경망을 사용했다. 실험에서 말뭉치는 3개이며 각기 구성을 하고 있다. 구성언어에 따른 모델의 정확도 비교실험과 학습말뭉치 크기에 비교실험, 단어 임베딩 방법에 비교 실험을 진행하여 말뭉치에 효율적인 심층신경망 선택을 위한 지침을 제공한다.

The proliferation of smart devices has boosted the improvement wireless network technologies. Herein, networking functions should be properly guaranteed even in highly dense environments terms service quality and data rate. In this paper, we present an efficient power allocation algorithm using non-orthogonal multiple access array antennas to increase capacity overlapped multi-cell environments. We evaluate proposed compare with conventional orthogonal scheme antennas. Through intensive...