An investigation of the usability of image-based CAPTCHAs using PROMETHEE-GAIA method

Multimedia Tools and Applications - Today, it is difficult to find an adequate Web site with a registration form that is not protected with some automated human proof test. One of the oldest...     

Performance of PSK signal transmitted over satellite channel

The authors determine the bit error rate of a digital satellite system with phase modulation when at the input of the satellite only Gaussian noise is added, while at the input of the earth station they assume both Gaussian noise and an interference approximated by the sum of n sinusoidal signals     

Cotton Yarn Sizing by Acrylamide Grafted Starch Copolymer

Synthesis and characterization of copolymer obtained by grafting acrylamide onto hydrolyzed potato starch and its application in cotton yarn sizing were presented in this work. Some process parameters of starch hydrolysis and grafting, like as hydrolysis yield, grafting yield, grafting percentage, graft efficiency, and monomer to polymer conversion were determinated. Molar mass values of hydrolyzed starch and copolymer samples are located in a narrow range of 1 × 10⁵ to 1 × 10⁷ and 1 × 10² to 1 × 10⁴. Grafted hydrolyzed starch, as a sizing agent, gives better results than nongrafted, particularly in terms of sizing uniformity, yarn mechanical parameters, and easier removal in subsequent desizing process.     

Adaptive self-reconfigurable interference suppression schemes forCDMA

In this paper we present a new approach to interference suppression in code-division multiple-access (CDMA) wireless networks. Depending on the interfering signal, these schemes adaptively change not only their parameters but their structures as well. For the relevant types of the interfering signal, suppression is also possible for the wideband interference occupying the same frequency band as the CDMA signal. Probability of error in these schemes is for several orders of magnitude better than in the existing solutions described in the open literature so far. The main applications are the CDMA overlay type wireless network collocated in the same frequency band with a high bit rate microwave communication system, and the multimedia CDMA network where high bit rate signal due to lower processing gain must use a higher level in order to provide the required quality of transmission     

Time to dP/dtmax reflects both inotropic and chronotropic properties of cardiac contraction: a conscious dog study

The value of protective gloves in the health care environment is well known. However, these gloves are not perfect. Some are permeable to microorganisms and various chemicals, and/or result in side effects for health care professionals. Gloves that offer the greatest protection and least side effects are highly desirable. Protection against microorganisms and protection against chemicals used in health care are described in Part II of this three-part series.