6,396 research outputs found
English language teaching in Taiwan : a study of the effects of teaching culture on motivation and identity.
SIGLEAvailable from British Library Document Supply Centre-DSC:DXN015199 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Capacity Analysis of Linear Operator Channels over Finite Fields
Motivated by communication through a network employing linear network coding,
capacities of linear operator channels (LOCs) with arbitrarily distributed
transfer matrices over finite fields are studied. Both the Shannon capacity
and the subspace coding capacity are analyzed. By establishing
and comparing lower bounds on and upper bounds on , various
necessary conditions and sufficient conditions such that are
obtained. A new class of LOCs such that is identified, which
includes LOCs with uniform-given-rank transfer matrices as special cases. It is
also demonstrated that is strictly less than for a broad
class of LOCs. In general, an optimal subspace coding scheme is difficult to
find because it requires to solve the maximization of a non-concave function.
However, for a LOC with a unique subspace degradation, can be
obtained by solving a convex optimization problem over rank distribution.
Classes of LOCs with a unique subspace degradation are characterized. Since
LOCs with uniform-given-rank transfer matrices have unique subspace
degradations, some existing results on LOCs with uniform-given-rank transfer
matrices are explained from a more general way.Comment: To appear in IEEE Transactions on Information Theor
Currency Board Versus Central Bank in a Currency Crisis
From June 1997 till presently had been a period of economic turmoil for many
parts of the Asian region. There has been experiences of economic overheating, inflation, deficit balance of payments, rising interest rate s coupled with the
downward spiral of the stock market s and currency devaluations.
This has brought about numerous debates on the causes and remedies of this
crisis. Among them are the usefulness of the currency board regime in regulating
the exchange rate s of the countries involved. This is an alternative system to the
present regime of central bank s in managing the countries' money supply.
The currency board basically is a monetary regime whereby the exchange rate of
the country as fixed with a chosen anchor currency whereby all its money supply
must be 100% backed by its foreign reserves.
The central bank system employs the floating exchange rate which has been
unsuccessful in warding off speculations on the currency. Further many other
disadvantages will be discussed in this thesis.
This thesis discuss the comparative characteristics between the currency board
and the central bank monetary regime in all its advantages and disadvantages.
An attempt i s made to define the currency board and the central bank and the
many versions associated with them. (Le., classical, modern and AEL-Argentina,
Lithuania, Estonia -model)
A closely related concept to the currency board, namely dollarization is also
discussed
On Linear Operator Channels over Finite Fields
Motivated by linear network coding, communication channels perform linear
operation over finite fields, namely linear operator channels (LOCs), are
studied in this paper. For such a channel, its output vector is a linear
transform of its input vector, and the transformation matrix is randomly and
independently generated. The transformation matrix is assumed to remain
constant for every T input vectors and to be unknown to both the transmitter
and the receiver. There are NO constraints on the distribution of the
transformation matrix and the field size.
Specifically, the optimality of subspace coding over LOCs is investigated. A
lower bound on the maximum achievable rate of subspace coding is obtained and
it is shown to be tight for some cases. The maximum achievable rate of
constant-dimensional subspace coding is characterized and the loss of rate
incurred by using constant-dimensional subspace coding is insignificant.
The maximum achievable rate of channel training is close to the lower bound
on the maximum achievable rate of subspace coding. Two coding approaches based
on channel training are proposed and their performances are evaluated. Our
first approach makes use of rank-metric codes and its optimality depends on the
existence of maximum rank distance codes. Our second approach applies linear
coding and it can achieve the maximum achievable rate of channel training. Our
code designs require only the knowledge of the expectation of the rank of the
transformation matrix. The second scheme can also be realized ratelessly
without a priori knowledge of the channel statistics.Comment: 53 pages, 3 figures, submitted to IEEE Transaction on Information
Theor
Potential for well-being in peer-to-peer sharing economy: a systematic review and modeling
Humans pursue well-being in their lives. Well-being encompasses positive emotions, life satisfaction, healthy functioning, meaning of life, and self-growth. In ancient times, sharing was an intimate behavior that consolidated communities and led to an ideal life, which refers to well-being in the present. Sharing economy sheds light on a novel business model in which people can develop their well-being while sharing resources/goods and services among strangers. However, prior research shows that users participate in the sharing economy because of self-interest rather than social interaction or sustainability. Sustainable well-being is important not only for us but also for our communities and our planet. This study investigates how the components of well-being can be built into a sharing economy and foster users to pursue it in the long-term. It reviews and synthesizes prior studies to (1) elucidate the components of well-being in the peer-to-peer (P2P) sharing economy, (2) model the sharing ecosystem with components of well-being from a global perspective, and (3) discuss the design solutions for a P2P sharing platform to facilitate well-being. Furthermore, it provides examples of practices to illustrate the proposed model. We believe this study not only motivates platformers to consider users’ well-being but also promotes sustainable functioning of the sharing ecosystem
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