Type

Database

Creator

Date

Thumbnail

Search results

1,353 records were found.

We present two local approaches that yield polynomial-time approximation schemes (PTAS) for the Maximum Independent Set and Minimum Dominating Set problem in unit disk graphs. The algorithms run locally in each node and compute a (1+ε)-approximation to the problems at hand for any given ε > 0. The time complexity of both algorithms is O(TMIS + log*! n/εO(1)), where TMIS is the time required to compute a maximal independent set in the graph, and n denotes the number of nodes. We then extend these results to a more general class of graphs in which the maximum number of pair-wise independent nodes in every r-neighborhood is at most polynomial in r. Such graphs of polynomially bounded growth are introduced as a more realistic model for wireless networks and they generalize existing models, such as unit disk graphs or coverage area graphs.
Ratio Analysis Technique (RAT) is not new to librarians. Ratios are at times, better than raw statistical data about libraries. Ratios not only help assessing the health of a library but also come handy for comparing performance of two libraries and enable one to project the growth trend of a library. Explains the complementary relation of ratios with standards for libraries and RAT as propounded in Financial Management. Points out that ratios are not totally free from flaws and enumerates their limitations. Explains how RAT can be applied to libraries by choosing seven variables of a library. Demonstrates 16 ratios from seven variables for ISRO Satellite Centre (ISAC) Library based on data for the last 13 years. The budget, space, staff, users, collection, annual addition and use / loan ratios of ISAC Library are interpreted to assess...
Taxoid is a member of a class of anticancer drugs derived from Yew (Taxus species) trees. This includes paclitaxel and docetaxel, which have found wide commercial exploitation. Currently taxoids are extracted from the taxus species through chemical extraction from needles, barks and through cell culture. These are chemical intensive processes and destroy the tree in the process of extraction too. The concentration of taxoids in the trees is also very low. Thus to treat one patient (2 g of paclitaxel), six 60-100 year old trees are required. This has led the species to the verge of extinction. Also the cost of the drug is sky high at 36.5€ per mg. Cheaper alternative to the natural paclitaxel do exist in the market but they have a much lower spectrum of curing ability. Hence doctors prefer to use the natural drug. Two researchers, Mar...
Comment: 17 pages, 1 figure, Typos fixed
A study is presented which shows that the growth of the plastic zone and the constraint in a compact tension specimen depends significantly on specimen width. The analysis permits the estimation of the contribution of the growth of plastic zone to the deviation from linearity. The contribution of the crack growth to the deviation from linearity is evaluated from the analysis of a typical R-curve data. A combination of these two analyses enables one to define a very simple procedure for the determination of fracture toughness. The fracture toughness is defined as the stress intensity value at which the crack extension starts. The good agreement between analytical results and experimental KQ and KIC values determined over a wide range of thicknesses, widths, and materials justifies the proposed procedures. The KIC determined according to...
Cutaneous involvement in renal disease is due to a host of factors ranging from metabolic disturbances to immunosuppressive drugs. Herein we report a series of six cases of renal failure with varied cutaneous manifestations ranging from infections to neoplasms due to prolonged immunosuppression. Our first case had cutaneous cryptococcosis where skin lesions gave a clue to the diagnosis of altered sensorium and underlying meningitis. The second case initially presented with florid warts and was treated successfully but later presented with an explosive recurrence of skin lesions due to malignant transformation. Our third case had basal cell carcinoma over the presternal region that was successfully treated with liquid nitrogen cryotherapy. Our fourth case had diabetic nephropathy that presented with septicemia and purpura fulminans. The...
This thesis has explored the possibility of using carbon nanotubes (CNT) as a novel material for through-silicon vias (TSV) in 3D-integrated circuits. With the steady downscaling trend of the semiconductor industry, a major limiting factor to the overall performance of the device is the delay from interconnects; a trend that is worsening over successive technology nodes. As a remedy to this, the industry has been exploring the possibility of fabricating three dimensional integrated circuits, with shorter interconnect lengths (hence delay). Even then, the standard interconnect (or via) material, which is copper, poses a host of physical and technological challenges that constrain the development of this technology. The carbon nanotube is considered to be a promising alternative to copper, which can alleviate most of these problems. Th...
Cutaneous involvement in renal disease is due to a host of factors ranging from metabolic disturbances to immunosuppressive drugs. Herein we report a series of six cases of renal failure with varied cutaneous manifestations ranging from infections to neoplasms due to prolonged immunosuppression. Our first case had cutaneous cryptococcosis where skin lesions gave a clue to the diagnosis of altered sensorium and underlying meningitis. The second case initially presented with florid warts and was treated successfully but later presented with an explosive recurrence of skin lesions due to malignant transformation. Our third case had basal cell carcinoma over the presternal region that was successfully treated with liquid nitrogen cryotherapy. Our fourth case had diabetic nephropathy that presented with septicemia and purpura fulminans. The...
Want to know more?If you want to know more about this cutting edge product, or schedule a demonstration on your own organisation, please feel free to contact us or read the available documentation at http://www.keep.pt/produtos/retrievo/?lang=en