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Systems based on spread spectrum technique are inherently interference resistant. However, asynchronous transmission and multipath propagation causes manifestation of multiuser interference. Multiuser interference in a multiple access system limits the capacity of the system. Hence, it becomes imperative to mitigate the interference. This work presents the design and mathematical analysis of Hybrid Interference Cancellation (HIC) detector for direct-sequence code division multiple access (DS-CDMA). The detector is analysed for single path as well as multipath propagation over a Rayleigh fading channel. Simulation results are compared with the results of Successive Interference Canceller (SIC). Furthermore, the SIC and HIC detectors are tested for convergence. An HIC detector is proposed for MC-CDMA system. The interference canceller discussed in this paper dispenses with the RAKE receiver for diversity combining and data estimation, which averts the likelihood of errors because of incorrect data estimates. [ABSTRACT FROM AUTHOR]

Cyclists have the largest risk of severe injury when colliding with a motor vehicle. The difference in weight (mass) is huge and the collision energy is mainly absorbed by the lighter ‘object’. A cyclist simulation study captured kinematics and injuries to head, torso, pelvis and legs for one human body size, bicycle type and car model. We analysed the number of parameters, such as pelvic acceleration, Neck tension force, Neck shear force, Head injury criterion, forces acting on left and right tibia for the specific case of car-to-bicycle collision – bicyclist ride-out-residential driveway. Simulation showed that the windscreen is a frequent head and torso impact location. We found the gap in technical literature on injuries mitigated as well as on the documented effect of legislation, which until now has not been as impressive in different countries as hoped. Bridging the implementation gap between science and policy actions for the safer cycling would be a reasonable step towards decreasing the number of injured cyclists and road traffic death rates. [ABSTRACT FROM AUTHOR]

Existing helmet sensor technologies are cost prohibitive or limited in capability to comprehensively assess sports-related head injury. Therefore, development of an accurate, fully compatible low-cost pressure-sensitive sensor is warranted. The aim was to develop a piezo-resistive sensor platform for direct measurement of HIC. Using a programmable microcontroller and 30x35 mm sensor, fifty drop tests with a 5 kg mass were conducted using a Kistler force plate with maximum vertical force of 5000 N. The Power function correlation between force-plate-derived peak force and sensor-derived peak resistance was high (r 2 = 0.974) and used to calculate sensor-derived force-time data. Analysis of force-time curves yielded comparable peak forces (R = 0.982) and time to peak forces (R = 0.938), yet sensor-derived impact durations were elevated (R = 0.498). High linear correlation was found between force-plate- and sensor-derived HIC (r 2 = 0.974). The force plate-derived HIC can be directly estimated with sufficient accuracy from sensor-derived force (r 2 = 0.980) and a residual standard deviation of 11% at HIC >100. Overall, results substantiated the piezo-resistive sensor platform for direct HIC measurement and development of a full-scale helmet system. [ABSTRACT FROM AUTHOR]

The article discusses the prevalence of fall from playground equipment particularly the children in Japan. It states that the number of victims of accidents in daily life is greater than those caused by traffic accidents wherein the common cause is fall accidents. It examines the importance to children from fall accidents in playgrounds.

Highlights: [•] SEM observations were performed on the surface and the cross-sectional plane of the fracture to detect the failure mode. [•] The control valve body failed due to combination of SSC and HIC cracking in wet H2S environment. [•] According to HIC and SSC laboratory tests the best alternative for the valve body alloy is A217-WC9 steel. [•] Anodic polarization curves clearly shows a considerable improvement in pitting resistance. [ABSTRACT FROM AUTHOR]

An abstract of the article "Series: Footsteps of information retrieval service pioneers (6): The handicraft database which software house began - The HiNET & the HAPPINESS development secret story," by Naoaki Kustsuzawa and Kazuyuki Iida is presented.

The article discusses the study by M. Kato and colleagues on the simplification and transformation of standards organization American Society for Testing Materials' F1292 measurement procedure for criteria of fall accident injury. The study reportedly involved maximum acceleration and the head injury criterion as indicators of possible severity of head injury. The author comments that the study failed to present theory on accelerations related to blunt trauma.