Search results for "link"

Energy Efficient Optimization for Solar-Powered UAV Communications System

2021

In this work, we explore the energy efficiency optimization for a solar-powered unmanned aerial vehicle (UAV) communications system. We consider a scenario where a number of ground users (GUs) connect with a solar-powered multi-antenna UAV over a wireless link. First, we are able to derive the relations between the uplink data rate and heading angle of UAV and transmission power of GUs. In addition, the harvested energy from solar light is also affected by UAV’s angle. Accordingly, with the objective to maximize the energy efficiency that is related to uplink data rate and energy consumption, we propose to dynamically adjust the UAV trajectory and gesture, by optimizing its velocity, accele…

HSDPA Link Adaptation Improvement Based on Node-B CQI Processing

2007

In this paper HSDPA link adaptation (LA) based on Channel Quality Indicator (CQI) reports is optimised. A pre-processing of the last received CQI reports is done before the execution of the LA algorithm in the Node-B in order to obtain more profitable channel quality estimations and hence improve the LA performance. Different types of processing techniques are presented and assessed, considering from the simplest sample averaging to some more elaborated predictive algorithms. Results demonstrate that a non negligible enhancement in the LA performance can be obtained if medium and high speed users are considered.

PROMOTING THE REGIONAL COMPETITIVENESS THROUGH CLUSTERS‘ APPROACH: CASE OF THE LATVIAN INFORMATION TECHNOLOGY CLUSTER

2018

The purpose of this research is to contribute to the debate on regional competitiveness concept by evaluating genesis of the studies of concept development, and the impact assessment. This paper also presents the impact of clusters on regional competitiveness through the experience of the Latvian Information Technology (IT) cluster. The methods used in the research are literature analysis, correlation and statistical analysis. The main tasks include: (i) the usage of competitiveness concept to describe main factors of regional competitiveness, (ii) identification of the role of clusters for regional competitiveness by testing the linkage between regional competitiveness and state of cluster…

An interaction orientation approach to SME-Intermediaries relationships

2021

Abstract Small and medium-sized enterprises (SMEs) engaging in foreign operations have drawn significant research attention in recent years. One of the aspects linked to such operations is SMEs’ expansion to foreign markets, often relying on local intermediaries. These intermediaries provide the firms with valuable resources such as market knowledge and recognition and reduce foreign operations’ costs. Hence, they are often considered as strategic partners. The current study aims to expand the existing knowledge regarding the relationships between business to business SMEs and their intermediaries by exploring interaction orientation as an organizational cultural aspect and its linkage to t…

Distance-related energy consumption analysis for mobile/relay stations in heterogeneous wireless networks

2010

While the availability of more than one mobile or wireless technologies is enhancing the ubiquity of the Internet access, the corresponding energy consumption effects on mobile station battery for connection selection has not been investigated in depth yet. In this paper, a heterogeneous wireless network, which consists of three constituent networks, is studied with respect to the amount of data communicated and the battery operation time. Four alternative hybrid paths for separate uplink and downlink traffic, each involving more than one network, are analyzed with respect to energy consumption aspects of the mobile (and relay) station. The energy in these paths is analyzed mainly by consid…

Real-time data processing in the ALICE High Level Trigger at the LHC

2019

At the Large Hadron Collider at CERN in Geneva, Switzerland, atomic nuclei are collided at ultra-relativistic energies. Many final-state particles are produced in each collision and their properties are measured by the ALICE detector. The detector signals induced by the produced particles are digitized leading to data rates that are in excess of 48 GB/$s$. The ALICE High Level Trigger (HLT) system pioneered the use of FPGA- and GPU-based algorithms to reconstruct charged-particle trajectories and reduce the data size in real time. The results of the reconstruction of the collision events, available online, are used for high level data quality and detector-performance monitoring and real-tim…

Generalization of Linked Canonical Polyadic Tensor Decomposition for Group Analysis

2019

Real-world data are often linked with each other since they share some common characteristics. The mutual linking can be seen as a core driving force of group analysis. This study proposes a generalized linked canonical polyadic tensor decomposition (GLCPTD) model that is well suited to exploiting the linking nature in multi-block tensor analysis. To address GLCPTD model, an efficient algorithm based on hierarchical alternating least squa res (HALS) method is proposed, termed as GLCPTD-HALS algorithm. The proposed algorithm enables the simultaneous extraction of common components, individual components and core tensors from tensor blocks. Simulation experiments of synthetic EEG data analysi…

Korpusu lietojums klasifikācijas un salīdzinājuma rindkopu rakstītmācīšanā

2018

Nesenie panākumi korpusa lingvistikā liecina par to, ka korpusa lietojums rakstītmācīšanā var nodrošināt svešvalodas ar īpašu datubāzi, sastāvošu no autentiskiem valodas datiem, kas savukārt var uzlabot mācību procesu. Šī pētījuma mērķis bija noskaidrot, vai korpusos balstītu aktivitāšu lietojums var uzlabot saistošo vārdu izmantošanu klasifikācijas un salīdzinājuma/kontrasta rindkopu rakstītmācīšanā. Pētniecības metode, kas tika izmantota šī maģistra darba tapšanā bija gadījuma izpēte, kas ietvēra pirmstestu, pēctestu un aptaujas anketu. Pētījuma rezultāti liecina, ka korpusos balstītu aktivitāšu izmantošana ievērojami uzlabo saistošo vārdu kopskaitu, palielina pareizi izmantoto saistošo v…

Cover Feature: The Missing Link in the Magnetism of Hybrid Cobalt Layered Hydroxides: The Odd–Even Effect of the Organic Spacer (Chem. Eur. J. 3/2021)

2020

Comparison of an indirect format ELISA on modified graphite and polystyrene surfaces against triazines.

2006

An indirect format enzyme-linked immuno-sorbent assay (ELISA) on graphite rods (Ø 0.8 mm x 20 mm) and, for comparison, on microtiter plates has been developed against terbuthylazine. For this purpose, a series of 2-aminoalkyl-4-chloro-6-terbuthyl-s-triazine-2,6- diamine ELISA haptens with alkyl spacer lengths of 2, 4, 6, and 8 CH2 groups has been synthesized. The graphite rods or the microtiter plates were covered by a polymerized glutaraldehyde network, and the ELISA haptens have been coupled by imino coupling to the free aldehyde groups of that network. ε-Aminocaproic acid has been used as an agent to block unspecific binding sites. The ELISA was run in a competitive mode, where the immob…