|
Showing 1 - 13 of
13 matches in All Departments
In sensor network applications, measured data are often meaningful
only when the location is accurately known. In this booklet, we
study research problems associated with node localization in
wireless sensor networks. We describe sensor network localization
problems in terms of a detection and estimation framework and we
emphasize specifically a cooperative process where sensors with
known locations are used to localize nodes at unknown locations. In
this class of problems, even if the location of a node is known,
the wireless links and transmission modalities between two nodes
may be unknown. In this case, sensor nodes are used to detect the
location and estimate pertinent data transmission activities
between nodes. In addition to the broader problem of sensor
localization, this booklet studies also specific localization
measurements such as time of arrival (TOA), received signal
strength (RSS), and direction of arrival (DOA). The sequential
localization algorithm, which uses a subset of sensor nodes to
estimate nearby sensor nodes' locations is discussed in detail.
Extensive bibliography is given for those readers who want to delve
further into specific topics.
Autonomous vehicles use global navigation satellite systems (GNSS)
to provide a position within a few centimeters of truth. Centimeter
positioning requires accurate measurement of each satellite's
direct path propagation time. Multipath corrupts the propagation
time estimate by creating a time-varying bias. A GNSS receiver
model is developed and the effects of multipath are investigated.
MATLABtm code is provided to enable readers to run simple GNSS
receiver simulations. More specifically, GNSS signal models are
presented and multipath mitigation techniques are described for
various multipath conditions. Appendices are included in the
booklet to derive some of the basics on early minus late code
synchronization methods. Details on the numerically controlled
oscillator and its properties are also given in the appendix.
This monograph introduces some current developments in the
modelling of the spread of tick-borne diseases. Effective modelling
requires the integration of multiple frameworks. Here, particular
attention is given to the previously neglected issues of tick
developmental and behavioral diapause, tick-borne pathogen
co-feeding transmission, and their interactions. An introduction to
the required basics of structured population formulations and delay
differential equations is given, and topics for future study are
suggested. The described techniques will also be useful in the
study of other vector-borne diseases. The ultimate aim of this
project is to develop a general qualitative framework leading to
tick-borne disease risk predictive tools and a decision support
system. The target audience is mathematical biologists interested
in modelling tick population dynamics and tick-borne disease
transmission, and developing computational tools for disease
prevention and control.
Complexity, Analysis and Control of Singular Biological Systems
follows the control of real-world biological systems at both
ecological and phyisological levels concentrating on the
application of now-extensively-investigated singular system theory.
Much effort has recently been dedicated to the modelling and
analysis of developing bioeconomic systems and the text establishes
singular examples of these, showing how proper control can help to
maintain sustainable economic development of biological resources.
The book begins from the essentials of singular systems theory and
bifurcations before tackling the use of various forms of control in
singular biological systems using examples including predator-prey
relationships and viral vaccination and quarantine control.
Researchers and graduate students studying the control of complex
biological systems are shown how a variety of methods can be
brought to bear and practitioners working with the economics of
biological systems and their control will also find the monograph
illuminating.
Increased Cu levels in blood, saliva and brain are found in
Mn-exposed animals and humans; the underlying mechanism is unknown.
Dyshomeostasis of Cu in the central nervous system is known to
contribute to the pathogeneses of several neurodegenerative
diseases. Regulation of cellular Cu homeostasis involves
Cu-transporting ATPases (Cu-ATPases), i.e., ATP7A and ATP7b. Both
transporters play an important role in removing excess Cu ions from
the cytosol. However, the questions as to whether and how
Cu-ATPases in the brain barrier systems transport Cu, i.e., toward
brain parenchyma, cerebrospinal fluid, or blood, and whether and
how Mn exposure affects the transport function of both Cu-ATPases,
remained unanswered. This study was designed to characterize the
role of Cu-ATPases in regulating Cu transport at the blood-brain
and blood-cerebrospinal fluid barriers and to investigate how
exposure to Mn may alter the function of ATP7A and ATP7B, thereby
contributing to the etiology of Mn-induced Parkinsonian disorder.
Due to intense competition and rapid changes happening in the
marketplace, business environment is increasingly becoming volatile
and uncertain. As a result, the ability to conduct effective
environmental scanning is becoming critical for organizations to
survive and succeed. This study investigates environmental scanning
and information sharing practices of Small and Medium Enterprises
(SMEs) in Singapore. A pre-tested questionnaire was sent out, and
45 SMEs from 4 industries participated. It was found that a
majority of the companies perceived environmental information as
critical, and conduct systematic environmental scanning activities.
The management level of SMEs had become aware of the importance of
information sharing, and efforts had been made to avoid information
hoarding. Moreover, SMEs from various industry domains seemed to
have different scanning strategies and manners, in terms of
preferences over information sources and distribution channels.
Suggestions are also provided to increase the effectiveness of
environmental scanning, as the collected information may not be
disseminated to the end-users in a timely manner.
|
You may like...
Catan
(16)
R1,150
R889
Discovery Miles 8 890
|