An apparatus for detecting a body part from a user image may include an image acquirer to acquire a depth image, an extractor to extract the user image from a foreground of the acquired depth image, and a body part detector to detect the body part from the user image, using a classifier trained based on at least one of a single-user image sample and a multi-user image sample. The single-user image may be an image representing non-overlapping users, and the multi-user image may be an image representing overlapping users.
Baoan Liu
Xin Yin
Xun Sun
Mingxia Xu
Shaohua Ji
Xinguang Xu and Jianfeng Zhang
A series of K(H1−xDx)2PO4 crystals were grown from deuterated aqueous solution by using a point-seed rapid-growth method. The elastic, piezoelectric and dielectric constants of these crystals were determined using the resonance technique and impedance analysis, respectively. The elastic compliance constant s11 measured in this experiment is larger than that in previous experiments, and the reliability of the results presented herein has been verified. These results show that, with increasing content of deuterium, s11, s44, s66, d36, e36 and k36 are gradually increased, whereas s12, s13, s33, d14, e14 and k14 have no demonstrable variation. The reasons for the composition dependence of these constants were analyzed based on the variation of the crystal structures resolved by single-crystal X-ray diffraction.
The complex space of cities exerted a profound and far-reaching influence on traditional Chinese fiction writing. Starting from the description of city spaces, particularly urban landmarks, as the backdrop for stories and ranging through the urban political culture of political struggles, power symbols, the selection of talent, and festivals and carnivals to the daily life of city dwellers with their dreams of prosperity, legendary love stories and inner yearning for justice, the cities of traditional Chinese fiction offer us a picture that goes far beyond the merely geographic to show political and cultural indicators and the content s of daily life. Such descriptions created vivid and distinct city images that in turn became the common life experience and cultural imagination of urban dwellers and offered a common cultural identity and standpoint for those living in the same city.
Dagang Liu
Xun Sun
Huafeng Tian
Sonakshi Maiti
Zhongshi Ma
A green method-joint mechanical grinding and high pressure homogenization-was used to defibrillate paper pulp into nanofibrils. The prepared cellulose nanofibrils (CNF) were then blended with PVA in an aqueous system to prepare transparent composite film. The size and morphology of the nanofibrils and their composites were observed, and the structure and properties were characterized. The results showed that CNFs are beneficial to improve the crystallinity, mechanical strength, Young's modulus, T (g) and thermal stability of the PVA matrix because of their high aspect ratio, crystallinity and good compatibility. Therefore, nano cellulosic fibrils were proven to be an effective reinforcing filler for the hydrophilic polymer matrix. Moreover, the green fabrication approaches will be helpful to build up biodegradable nanocomposites with wide applications in functional environmentally friendly materials.
An apparatus and method for parsing a human body image may be implemented by acquiring a depth image including a human body, and detecting a plurality of points in the acquired depth image by conducting a minimum energy skeleton scan on the depth image.
An identity-based verifiably committed signature scheme (IB-VCS) was proposed, which is proved secure in the standard model (i.e., without random oracles). It enjoys the setup-free property and stand-alone property, both of which make an exchange protocol more practical. The scheme is unconditionally secure against the cheating signer, its security against the cheating verifier is reduced to the computational Diffie-Hellman (CDH) problem in the underlying group, it is secure against the cheating trusted third party if the underlying Paterson Schuldt's identity based signature (IBS) scheme is secure, which is proven true based on the CDH assumption in the standard model.
A (t, n) threshold signature scheme distributes the secret key and hence the signing ability to n players in a way that any set of t+1 or more honest players can collaborate to sign, while any set of t players cannot. In this paper we propose an identity-based threshold signature (IBTHS) scheme from bilinear pairings. The signing phase of our scheme is non-interactive, meaning that the signing players do not need to talk to each other. We prove our scheme secure (i.e., unforgeable and robust) in the standard model (i.e., without random oracles). No earlier proposed IBTHS scheme achieved even one of the features of being non-interactive (in the signing phase) and secure in the standard model.
The nickel-catalyzed reaction for an unexpected 1,3-migration of tert-butyl from sulfur to carbon, upon treatment of functionalized N-tert-butanesulfinyl iminoacetate in the presence of organozinc reagent, was developed. The generality has been explored by considering the flexibility in the structure of each reactive component, organozinc halide and N-tert-butanesulfinyl iminoacetate.
Ping Wang
Xun Sun
Chao Li
Zhiwei Wei
Dong Liang and Fengwang Ma
To examine the potential roles of melatonin in drought tolerance, we tested the effects of its long-term exogenous application on ‘Hanfu’ apple (Malus domestica Borkh.). When 100 μm melatonin was added to soils under drought conditions, the resultant oxidative stress was eased and leaf senescence was delayed. This molecule significantly reduced chlorophyll degradation and suppressed the up-regulation of senescence-associated gene 12 (SAG12) and pheophorbide a oxygenase (PAO). Such treatment also alleviated the inhibition of photosynthesis brought on by drought stress. We also investigated quenching and the efficiency of Photosystem II (PSII) photochemistry under dark and light conditions and found that melatonin helped to maintain better function of PSII under drought. The addition of melatonin also controlled the burst of hydrogen peroxide, possibly through direct scavenging and by enhancing the activities of antioxidative enzymes and the capacity of the ascorbate–glutathione cycle. Thus, understanding this effect of melatonin on drought tolerance introduces new possibilities to use this compound for agricultural purposes.
Automated truck lanes (ATL) is a future technology for alleviating high proportion of truck usage. This paper proposes a hybrid microscopic-mesoscopic traffic simulator that can be used to precisely estimate the changes in traffic flows that would result from introduction of ATL on large-scale road networks. An integration framework is designed to ensure consistency of route choice and synchronization between mesoscopic and microscopic simulators. Microscopic car-following and lane-changing models are extended to reflect detailed interactions between cars and trucks. Three cases are simulated to evaluate the impact of ATL on traffic flows, proportion of trucks, travel time, and performance in total travel time saving. Finally, an analysis of safety and the effect of road incidents on travel time are also conducted using the hybrid simulator. Simulation results indicate that ATL can change traffic volumes not only on the expressway itself (New Tomei-Meishin Expressway) but also on the other expressways in the network, leading to shorter travel times and improved safety. For a more precise evaluation, the ATL system should be analyzed as part of a large-scale road network.
Xun Sun
Xin-Guang Xu
Da-Liang Sun
Zheng-Ping Wang
Sheng-Lai Wang
You-Jun Fu
Hong Zeng
Yi-Ping Li
Xi-Ling Yu
Zhang-Shou Gao
We describe the formation of a liquid inclusion induced light scatter in a potassium dihydrogen phosphate crystal. The measurements were made by ultra-microscopy, TEM and AFM. The dimension of the scatter and the composition have been measured and a mechanism formation of the liquid inclusion induced scatter is proposed and discussed
Xun Sun
Xinguang Xu
Youjun Fu
Shenglai Wang
Hong Zeng
Yiping Li
Zhangshou Gao
Pyrophosphate doped potassium dihydrogen phosphate (KDP) crystal was grown from aqueous solution by the temperature lowering method. Light scatter in KDP crystal was detected with the ultramicroscopic method. The light scatter in KDP crystal was aggravated when pyrophosphate was doped into the growth solution, which was distributed ununiformly in prism and pyramidal sectors of KDP crystal. Different effects of pyrophosphate on prism and pyramidal sectors of KDP crystal can explain this case. The transmission in this crystal was measured, showing that pyrophosphate affects the transmission evidently
Xun Sun
Xinguang Xu
Zhangshou Gao
Youjun Fu
Shenglai Wang
Hong Zeng
Yiping Li
KDP crystals with different concentrations of EDTA in solution were grown. Light scatter was detected with ultramicroscopic method. It has been proven that light scatter in KDP crystal aggravates with the increasing concentration of EDTA in the growth solution. The increase with light scatter occurs since EDTA inhibits the growth of KDP crystal at high concentration, which results in the formation of mother liquid inclusions, which in turn causes light scatter. The density, size and shape of light scatter are varied within different sectors of the KDP crystal. The mechanism of the effect is discussed
Xun SUN
Jun ZHU
Chen ZHONG
Ken-Ji IZUMI
Chen ZHANG
Abstract A new and convenient synthetic method has been developed for the construction of stilbenes bearing electron-withdrawing group(s) by using benzils and arylmethyldiphenylphosphine oxides via sequences involving Wittig-Horner reaction and a rearrangement in the presence of t-BuOK in toluene under mild conditions. This approach could be readily applied to a facile synthesis of biologically important natural products, resveratrol and its derivatives, such as trimethoxystilbenes 1 (Z) and 2 (E).
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