Peer-to-peer bichromatic reverse nearest neighbours in mobile ad-hoc networks

The increasing use of mobile communications has raised many issues of decision support and resource allocation. A crucial problem is how to solve queries of Reverse Nearest Neighbour (RNN). An RNN query returns all objects that consider the query object as their nearest neighbour. Existing methods mostly rely on a centralised base station. However, mobile P2P systems offer many benefits, including self-organisation, fault-tolerance and load-balancing. In this study, we propose and evaluate 3 distinct P2P algorithms focusing on bichromatic RNN queries, in which mobile query peers and static objects of interest are of two different categories, based on a time-out mechanism and a boundary polygon around the mobile query peers. The Brute-Force Search Algorithm provides a naive approach to exploit shared information among peers whereas two other Boundary Search Algorithms filter a number of peers involved in query processing. The algorithms are evaluated in the MiXiM simulation framework with both real and synthetic datasets. The results show the practical feasibility of the P2P approach for solving bichromatic RNN queries for mobile networks.     

完美需要一点点坚持

"is still designing……"(设计中……)每当Joost van Bleiwijk在MSN上线的时候,都能看到他这段闪烁的签名。荷兰与这里时差7个小时,你却几乎总能在线上找到他,他很忙,工作起来几乎夜以继日。     

Vocal interaction at 3 months and cognitive skills at 12 years.

Measured the differential vocal responsiveness (DVR) of 12 3-mo-old normal firstborn male infants to vocal–visual stimulation by the mother vs a stranger. There was a significant correlation between Ss' DVR at 3 mo of age and their performance at 12 yrs of age on the Verbal subscale of the WISC-R, the Peabody Picture Vocabulary Test, and the Reading and Arithmetic subtests of the Wide Range Achievement Test. (1 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Gamma irradiation of Aspergillus flavus strains associated with Indonesian nutmeg (Myristica fragrans)

Food Science and Biotechnology - The aims of this work were to investigate the effects of gamma irradiation on population, viability and aflatoxin B1 production of Aspergillus flavus strains...     

Sex differences in vocal interaction with mother and stranger in Greek infants: Some cognitive implications.

Studies in the US rarely find differences in the social–vocal behaviors of male and female infants, and when such differences are found, they favor females. The present study examined whether this pattern would hold true in Greece, where the parental preference for boys over girls could differentially affect rearing behavior. Ss were normal 3-mo-olds, 39 reared by their parents and 25 reared in an institution. Ss' vocal interaction pattern was assessed by differential vocal responsiveness (DVR) to mother/caretaker or a stranger during 3-min social–vocal interactions. Home-reared males had higher DVR scores than home-reared females, whereas no such sex difference was obtained for the institution-reared infants. Also, the affective voice quality rating of mothers talking to their sons was higher than that of mothers talking to their daughters, whereas no such difference existed in the way caretakers talked to the institution-reared infants. Results suggest that early differences in vocal-interactional patterns, and possibly cognitive processing, may be attributable to differences in parental behavior. (21 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

HSIR: hybrid architecture for sensor identification and registration for IoT applications

Internet of things is the backbone of the smart applications, which attracts many types of research on the state-of-the-art network applications. Enormous research on sensor networks left more devices that are sensible in the day-to-day life. Hence, implementing new sensor networks for smart applications is not necessary. Many researchers have accepted and utilized existing networks for their request. In this case, techniques for identifying and registering existing sensible things are on demand. This paper proposed a hybrid framework for sensor identification and registration (HSIR) for new IoT applications. This research proposing HSIR as a framework aimed for user-friendliness in the IoT as well as addressed toward the scalability requirement of IoT applications. This model uses content- and context-based multicast communication instead of broadcast to reduce energy and time consumption in sensor identification. HSIR also proposed a public key to register the new network for application requirements. The behaviour of the proposed model has been assayed in realistic with simulations and proved by comparing other models.

     

Kinetics of enthalpy relaxation of milk protein concentrate powder upon ageing and its effect on solubility

Kinetics of enthalpy relaxation of milk protein concentrate (MPC) powder upon short-term (up to 67 h) storage at 25 °C and a_w 0.85, and long-term (up to 48 days) storage at 25 °C and a range of a_w values (0–0.85) were studied by differential scanning calorimetry (DSC). The short-term study showed a rapid recovery of enthalpy for the first 48 h, followed by a slower steady increase with time. The non-exponential β parameter was calculated using the Kohlrausch–Williams–Watts function and found to be 0.39. Long-term storage showed that enthalpy relaxation depends on both storage period and water activity. The enthalpy value was much less for lower moisture content (mc) (a_w ? 0.23, mc ? 5.5%) than for higher mc (a_w ? 0.45, mc ? 8%) samples for a particular storage period. The results suggest that the presence of more water molecules, in close proximity to the protein surface facilitates kinetic unfreezing and subsequent motion of molecular segments of protein molecules towards thermodynamic equilibrium. Although de-ageing of stored samples did not reverse storage-induced solubility losses, the timescale of enthalpy relaxation was similar to that of solubility loss. It is suggested that enthalpy relaxation within stored samples allows structural rearrangements that are responsible for subsequent solubility decreases.     

Enhanced electrochemical performance of graphitic carbon-wrapped spherical FeOF nanoparticles using maleopimaric acid as a cathode material for sodium-ion batteries

Sodium-ion batteries(SIBs)are considered one of the most promising energy storage systems for replac-ing lithium-ion batteries because of the high abundance and low cost of sodium.Iron oxyfluoride(FeOF)is a promising conversion-based cathode material for SIBs because of its high theoretical capacity of about 855 mA h g-1,low-cost chemical compositions,and its lower sensitivity to the size of charged carrier ions.However,the poor electrical conductivity and ionic diffusion of FeOF result in a low rate capability and cyclability.In this work,FeOF nanoparticles wrapped by graphitic carbon layers were synthesized using abietic or maleopimaric acid as both the carbon source and organic ligand.In addition,the mor-phology of the FeOF particles was gradually controlled from rod to spherical shapes,simply depending on the rosin acids.The FeOF nanoparticles prepared with maleopimaric acid showed a large reversible discharge capacity of 356.7 mA h g-1 with a fading rate of 0.21％per cycle after 100 cycles at a current density of 100 mA g-1 and an excellent rate capability.     

采用有限元法设计电磁成形的非均匀线圈(英文)

电磁成形是一种使用脉冲电磁力快速成形的工艺。线圈是电磁成形系统中的一个重要组成部分,需要根据实际应用情况来设计。均匀螺旋线圈通常用在金属板材零件成形中。然而,对于这类非均匀线圈,工件中心部位的电磁力弱,从而导致变形不充分并且还有其它问题出现,如滞留气泡。因此,提出一个设计非均匀线圈的概念,以便电磁力的分布更均匀。采用有限元法对提出的非均匀线圈与传统的均匀螺旋线圈就电磁力的分布、磁场和电流密度进行比较。结果表明,非均匀线圈的电磁力分布更均匀。还计算了线圈的感应强度并进行了比较。