5,033 research outputs found
Smart Meter Privacy with Renewable Energy and a Finite Capacity Battery
We address the smart meter (SM) privacy problem by considering the
availability of a renewable energy source (RES) and a battery which can be
exploited by a consumer to partially hide the consumption pattern from the
utility provider (UP). Privacy is measured by the mutual information rate
between the consumer's energy consumption and the renewable energy generation
process, and the energy received from the grid, where the latter is known by
the UP through the SM readings, and the former two are to be kept private. By
expressing the information leakage as an additive quantity, we cast the problem
as a stochastic control problem, and formulate the corresponding Bellman
equations.Comment: To appear in IEEE SPAWC 201
An assessment of supply chain and innovation management practices in the manufacturing industries in Turkey
This paper aims at assessing the supply chain and innovation management in the manufacturing industries in Turkey on an empirical basis. The assessments presented are based on parts of the data and information collected through the execution of the Competitive Strategies and Best Practices Benchmarking Questionnaire in 82 companies from four sectors of the manufacturing industries in Turkey. Results of these sectoral benchmarking studies reported elsewhere indicate the need of adopting product differentiation particularly through more knowledge intensive products as the dominant competitive strategy and also the need for improvement in various areas of supply chain as well as innovation management. In this paper, these issues are analysed through the survey results and some conclusions are drawn. Several policy measures applicable in near future are suggested for improving the areas found in need of improvement
Learning-Based Optimization of Cache Content in a Small Cell Base Station
Optimal cache content placement in a wireless small cell base station (sBS)
with limited backhaul capacity is studied. The sBS has a large cache memory and
provides content-level selective offloading by delivering high data rate
contents to users in its coverage area. The goal of the sBS content controller
(CC) is to store the most popular contents in the sBS cache memory such that
the maximum amount of data can be fetched directly form the sBS, not relying on
the limited backhaul resources during peak traffic periods. If the popularity
profile is known in advance, the problem reduces to a knapsack problem.
However, it is assumed in this work that, the popularity profile of the files
is not known by the CC, and it can only observe the instantaneous demand for
the cached content. Hence, the cache content placement is optimised based on
the demand history. By refreshing the cache content at regular time intervals,
the CC tries to learn the popularity profile, while exploiting the limited
cache capacity in the best way possible. Three algorithms are studied for this
cache content placement problem, leading to different exploitation-exploration
trade-offs. We provide extensive numerical simulations in order to study the
time-evolution of these algorithms, and the impact of the system parameters,
such as the number of files, the number of users, the cache size, and the
skewness of the popularity profile, on the performance. It is shown that the
proposed algorithms quickly learn the popularity profile for a wide range of
system parameters.Comment: Accepted to IEEE ICC 2014, Sydney, Australia. Minor typos corrected.
Algorithm MCUCB correcte
Uncoded Caching and Cross-level Coded Delivery for Non-uniform File Popularity
Proactive content caching at user devices and coded delivery is studied
considering a non-uniform file popularity distribution. A novel centralized
uncoded caching and coded delivery scheme, which can be applied to large file
libraries, is proposed. The proposed cross-level coded delivery (CLCD) scheme
is shown to achieve a lower average delivery rate than the state of art. In the
proposed CLCD scheme, the same subpacketization is used for all the files in
the library in order to prevent additional zero-padding in the delivery phase,
and unlike the existing schemes in the literature, two users requesting files
from different popularity groups can be served by the same multicast message in
order to reduce the delivery rate. Simulation results indicate significant
reduction in the average delivery rate for typical Zipf distribution parameter
values.Comment: A shorter version of this paper has been presented at IEEE
International Conference on Communications (ICC) 201
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