An Efficient Approach to Privacy Preserving Association Rule Mining

The vulnerabilities associated with large databases is increasing with the passage of time and sharing of data over a network becomes a critical issue for every organization. When we talk about data mining approaches,there has been a tremendous success. But when we see the other side of the coin, it has put the databases and its sensitive information on the verge of being modified or altered by unwanted sources. The major problem is still out in there in the middle and we need to create a balance between the data mining results with the appropriate time management to hide the data. The main focus should be on how we can keep our sensitive data private and the sensitive information could not be revealed through data mining techniques with ease. In this thesis, we focus on hiding the sensitive data with a much faster pace as compared to hiding counter algorithm

Integrated Thermal Energy Storage System For Air-conditioners With Phase-Change Composites

Thermal energy storage (TES) is a promising solution to store and dispatch energy and shave peak electric load, reducing the operational cost of HVAC systems. We present results of a TES system using phase-change materials (PCM) integrated with an air conditioner. The proposed system uses an organic PCM (tetradecane) encapsulated within compressed expanded natural graphite foams referred to as phase-change composite. The graphite foam encapsulates the PCM eliminating the need for expensive storage vessels, reduces installation costs, and provides higher thermal conductivity that can lead to faster charge/discharge rates. Two serpentines, multi-pass circuits, operating as a heat source and a sink, exchange heat to and from the phase-change composite. These two circuits are embedded in multiple slabs of this material. The “charge” circuit contains the refrigerant that is directly coupled to a vapor compression system, and the “discharge” circuit removes heat from an airstream and releases it into the PCM composite through a water-glycol liquid coupling. This configuration allows for multiple modes of operation depending on the state of charge of the thermal energy storage module, the building air-conditioning load, and the current electricity and demand charges. This flexible operation allows variable air volume capacity control without the need to have a variable capacity refrigeration system. We developed a 21 kW-hr (6 RT-hr) prototype TES system coupled with a commercial air-conditioner to characterize the component-and system-level performance

A stochastic control approach for scheduling multimedia transmissions over a polled multiaccess fading channel

We develop scheduling strategies for carrying multimedia traffic over a polled multiple access wireless network with fading. We consider a slotted system with three classes of traffic (voice, streaming media and file transfers). A Markov model is used for the fading and also for modeling voice packet arrivals and streaming arrivals. The performance objectives are a loss probability for voice, mean network delay for streaming media, and time average throughput for file transfers. A central scheduler (e.g., the access point in a single cell IEEE 802.11 wireless local area network (WLAN)) is assumed to be able to keep track of all the available state information and make the scheduling decision in each slot (e.g., as would be the case for PCF mode operation of the IEEE 802.11 WLAN). The problem is modeled as a constrained Markov decision problem. By using constraint relaxations (a linear relaxation and Whittle type relaxations) an index based policy is obtained. For the file transfers the decision problem turns out to be one with partial state information. Numerical comparisons are provided with the performance obtained from some simple policies

Chordal graphs, higher independence and vertex decomposable complexes

Given a simple undirected graph $G$ there is a simplicial complex $\mathrm{Ind}(G)$, called the independence complex, whose faces correspond to the independent sets of $G$. This is a well studied concept because it provides a fertile ground for interactions between commutative algebra, graph theory and algebraic topology. One of the line of research pursued by many authors is to determine the graph classes for which the associated independence complex is Cohen-Macaulay. For example, it is known that when $G$ is a chordal graph the complex $\mathrm{Ind}(G)$ is in fact vertex decomposable, the strongest condition in the Cohen-Macaulay ladder. In this article we consider a generalization of independence complex. Given $r\geq 1$, a subset of the vertex set is called $r$-independent if the connected components of the induced subgraph have cardinality at most $r$. The collection of all $r$-independent subsets of $G$ form a simplicial complex called the $r$-independence complex and is denoted by $\mathrm{Ind}_r(G)$. It is known that when $G$ is a chordal graph the complex $\mathrm{Ind}_r(G)$ has the homotopy type of a wedge of spheres. It is natural to ask which of the Cohen-Macaulay conditions is satisfied by these complexes. We prove, using Woodroofe's chordal hypergraph notion, that these complexes are always shellable. Further, using the notion of vertex splittable ideals we identify certain sub-classes of chordal graphs for which the associated complex is vertex decomposable.Comment: 15 pages, 4 figures. Comments are welcom

The Borsuk-Ulam theorem for planar polygon spaces

The moduli space of planar polygons with generic side lengths is a closed, smooth manifold. Mapping a polygon to its reflected image across the $X$-axis defines a fixed-point-free involution on these moduli spaces, making them into free $\mathbb{Z}_2$-spaces. There are some important numerical parameters associated with free $\mathbb{Z}_2$-spaces, like index and coindex. In this paper, we compute these parameters for some moduli spaces of polygons. We also determine for which of these spaces a generalized version of the Borsuk-Ulam theorem hold. Moreover, we obtain a formula for the Stiefel-Whitney height in terms of the the genetic code, a combinatorial data associated with side lengths.Comment: To appear in Topology and its Application

Lymphoblasts with Auer rod – like inclusions in a case of paediatric B lymphoblastic leukemia

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137281/1/pbc26392.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/137281/2/pbc26392_am.pd

Use and inappropriate use of proton pump inhibitors in hospitalized patients

Background: The discovery of Helicobacter pylori infection in etiology of peptic ulcer disease and proton pump inhibitors (PPI) in management of upper gastrointestinal diseases had been the milestones in medical science. PPI are currently being both overused and misused. In countries like India, where over 500 branded formulations of PPI are available, probability of misuse and abuse increases exponentially. The aim of the study was to find out inappropriate use of PPI, among hospitalized patients.Methods: In order to find answer to the research question a cross sectional study was conducted in indoor patient of a tertiary care private hospital at Jaipur, Rajasthan. Patients of either sex, aged 18 years or above belonging to rural and urban communities were participating in study. The sample size was 500.Results: It was noted that Inappropriate PPI use was observed in most of the hospital admitted patients (78%). Most common diagnosis among inappropriate PPI use was dengue fever (due to increased number of dengue cases during study period), followed by cerebrovascular accidents and urinary tract infection. Most common indication for appropriate PPI use was stress ulcer prophylaxis, again in dengue case (due to cardinal manifestation of thrombocytopenia).Conclusions: Almost all patients were once prescribed PPI after admission and discharged on PPI (99.2%). Thus, we recommend evidence-based prescription of PPI, to reduce side effects and excess cost