With a profusion of network applications, traffic classification plays a crucial role in network management and policy-based security control. The widely used encryption transmission protocols, such ...as the secure socket layer/transport layer security (SSL/TLS) protocols, lead to the failure of traditional payload-based classification methods. Existing methods for encrypted traffic classification cannot achieve high discrimination accuracy for applications with similar fingerprints. In this paper, we propose an attribute-aware encrypted traffic classification method based on the second-order Markov Chains. We start by exploring approaches that can further improve the performance of existing methods in terms of discrimination accuracy, and make promising observations that the application attribute bigram, which consists of the certificate packet length and the first application data size in SSL/TLS sessions, contributes to application discrimination. To increase the diversity of application fingerprints, we develop a new method by incorporating the attribute bigrams into the second-order homogeneous Markov chains. Extensive evaluation results show that the proposed method can improve the classification accuracy by 29% on the average compared with the state-of-the-art Markov-based method.
Searching on remote encrypted data (commonly known as searchable encryption) has become an important issue in secure data outsourcing, since it allows users to outsource encrypted data to an ...untrusted third party while maintains the capability of keyword search on the data.
Searchable encryption can be achieved using the classical method called oblivious RAM, but the resultant schemes are too inefficient to be applied in the real-world scenarios (e.g., cloud computing). Recently, a number of efficient searchable encryption schemes have been proposed under weaker security guarantees. Such schemes, however, still leak statistical information about the users’ search pattern.
In this paper, we first present two concrete attack methods to show that the search pattern leakage will result in such a situation: an adversary who has some auxiliary knowledge can uncover the underlying keywords of user queries. To address this issue, we then develop a grouping-based construction (GBC) to transform an existing searchable encryption scheme to a new scheme hiding the search pattern. Finally, experiments based on the real-world dataset demonstrate the effectiveness of our attack methods and the feasibility of our construction.
Although researchers have examined the potential contribution of harsh parenting to child aggression, they have rarely explored how one parent’s harsh discipline could interact with warmth by another ...parent to affect child aggression. We sought to clarify whether the impact of harsh parenting by one parent on child effortful control could be buffered by warmth of the other parent, further reducing the likelihood of child aggression. 867 adolescents were chosen from two public middle schools situated in Jinan, the provincial city in Northern China. Data were gathered with adolescents reporting effortful control, their parents reporting harsh parenting, and their classmates nominating aggressive peers. A moderated mediation model was used to test the mediating and moderating hypotheses. Results indicated that adolescent effortful control partially mediated the relation of harsh fathering to adolescent aggression and completely mediated the relation of harsh mothering to adolescent aggression. Moreover, harsh fathering was only negatively associated with effortful control among adolescents with low maternal warmth and harsh mothering was only negatively associated with effortful control among adolescents with low paternal warmth, thus lowering the risk for aggression. The main conclusion is that harsh parenting by one parent could only indirectly impact on adolescent aggression via the mediator of effortful control only for adolescents with low warmth by the other parent. Our findings add to extant understandings on how different parenting practices by both parents may interact to influence children’s aggressive behaviors.
Abstract This study examined the mediating roles of three types of child aggression in the relation between harsh parenting and Chinese early adolescents’ peer acceptance as well as the moderating ...role of child gender on this indirect relation. 833 children (mean age = 13.58, 352 girls) with their parents were recruited as participants from two junior high schools in Shandong Province, People’s Republic of China. The results showed that paternal harsh parenting was only associated with boys’ aggressive behaviors and maternal harsh parenting was only associated with boys’ and girls’ verbal aggression. Adolescents’ verbal and relational aggressions were negatively associated with their peer acceptance. Verbal aggression was more strongly and negatively associated with girls’ peer acceptance. The results imply that in the Chinese cultural context, paternal harsh parenting may compromise boys’ peer acceptance through boys’ verbal and relational aggression as mediators, whereas maternal harsh parenting may impair children’s peer acceptance through children’s verbal aggression as a mediator, especially for girls. These results provide a theoretical basis for ameliorating the negative effect of harsh parenting on early adolescents’ peer acceptance by reducing their aggressive behaviors, with different strategies between boys and girls.
The purpose of this research was to investigate the chemical profile, nutritional quality, antioxidant and hypolipidemic effects of Mexican chia seed oil (CSO) in vitro. Chemical characterization of ...CSO indicated the content of α-linolenic acid (63.64% of total fatty acids) to be the highest, followed by linoleic acid (19.84%), and saturated fatty acid (less than 11%). Trilinolenin content (53.44% of total triacylglycerols (TAGs)) was found to be the highest among seven TAGs in CSO. The antioxidant capacity of CSO, evaluated with ABTS
and DPPH
methods, showed mild antioxidant capacity when compared with Tocopherol and Catechin. In addition, CSO was found to lower triglyceride (TG) and low-density lipoprotein-cholesterol (LDL-C) levels by 25.8% and 72.9%respectively in a HepG2 lipid accumulation model. As CSO exhibits these chemical and biological characteristics, it is a potential resource of essential fatty acids for human use.
The smart meta-superconductor MgB2 and Bi(Pb)SrCaCuO increase the superconducting transition temperature (TC), but the changes in the transport critical current density (JC) and Meissner effect are ...still unknown. Here, we investigated the JC and Meissner effect of smart meta-superconductor MgB2 and Bi(Pb)SrCaCuO. The use of the standard four-probe method shows that Y2O3:Eu3+ and Y2O3:Eu3++Ag inhomogeneous phase significantly increase the JC, and JC decreases to a minimum value at a higher temperature. The Meissner effect was measured by direct current magnetization. The doping of Y2O3:Eu3+ and Y2O3:Eu3++Ag luminescent inhomogeneous phase causes a Meissner effect of MgB2 and Bi(Pb)SrCaCuO at a higher temperature, while the non-luminescent dopant reduces the temperature at which samples have Meissner effect. The introduction of luminescent inhomogeneous phase in conventional MgB2 and copper oxide high-temperature Bi(Pb)SrCaCuO superconductor increases the TC and JC, and Meissner effect is exerted at higher temperature. Therefore, smart meta-superconductivity is suitable for conventional and copper oxide high-temperature superconductors.
Efficient gas extraction technology is an important topic for low permeability and high gas outburst coal seam. Based on the engineering background of Hudi Coal Mine with the soft and hard coal seams ...and the existing hydraulic permeability enhancement technology, a new construction process to improve coal seam permeability was proposed to effectively reduce coal seam gas content and the risk of coal and gas outburst. In this measure, the roadway in floor was replaced with a directional main borehole, directional branch boreholes were used to replace crossing holes, and soft coal was mined along soft sub layers
via
the directional drilling machine and directional hydraulic jet. Main boreholes are drilled parallel to the seam in the coal seam floor, and branch boreholes are drilled through the floor and coal seam. The numerical simulation was used to study the permeability improvement effect of different mining diameters by the proposed measure. The result showed that, as the mining diameter increased from 2 m to 4 m, the average influence diameter of coal seam porosity increased from 15.44 m to 19.65 m, and the average influence diameter of the permeability increased from 15.75 m to 20.07 m, which is three times the influence range of the ordinary borehole. The application of the proposed measure and its supporting equipment was carried out under the special coal seam and gas conditions of Hudi Coal Mine. Results show that the soft coal was mined efficiently along the soft sub layer using the main borehole, branch boreholes, and directional hydraulic jet. Compared the traditional hydraulic flushing in the borehole with the ordinary drilling machine, the average speed of mining soft sub layers increased from 0.5 t/h to 3.6 t/h, the equivalent mining diameter of soft sub layers increased from 1.2 m to 7.6 m, and the average flow of gas extraction increased from 0.41 m
3
/d to 6.25 m
3
/d. The conclusions obtained in this study can provide a reference for coal mine gas extraction with similar coal seam conditions.
A series of benzimidazole carboxamide derivatives have been synthesized and characterized by 1H-NMR, 13C-NMR and HRMS. PARP inhibition assays and cellular proliferation assays have also been carried ...out. Compounds 5cj and 5cp exhibited potential anticancer activities with IC50 values of about 4 nM against both PARP-1 and PARP-2, similar to the reference drug veliparib. The two compounds also displayed slightly better in vitro cytotoxicities against MDA-MB-436 and CAPAN-1 cell lines than veliparib and olaparib, with values of 17.4 µM and 11.4 µM, 19.8 µM and 15.5 µM, respectively. The structure-activity relationship based on molecular docking was discussed as well.
Efficient and economic parcel delivery becomes a key factor in the success of online shopping. Addressing this challenge, this paper proposes to crowdsource the parcel delivery task to urban vehicles ...to utilize their spare capacities, thus improving the efficiency while reducing traffic congestions. The delivery is planned as a multi-hop process, and participating vehicles will carry parcels from one shipping point to the next until they arrive at the destination, following the routes learned from the historical traffic statistics. The major contributions include an incentive framework to motivate the vehicles to participate in the delivery tasks by preserving the interests of the platform, the sender, and the crowd vehicles. Two incentive models are designed from platform-centric and user-centric perspectives, respectively. The platform-centric model first assesses an optimal reward <inline-formula> <tex-math notation="LaTeX">R </tex-math></inline-formula> for parcel delivery with the principle of Stackelberg game, which enables the platform to maximize its profit. The user-centric model then applies a reverse auction mechanism to select the winning bids of vehicles while minimizing the sender cost, with truthfulness guarantee. Theoretical analysis and extensive experiments on a real urban vehicle trace dataset are provided to validate the efficacy of the proposed framework.
Previous studies have reported that recombinant tumor necrosis factor (TNF)-α has powerful antiviral activity but severe systematic side effects. Jasminin is a common bioactive component found in ...Chinese herbal medicine beverage "Jasmine Tea". Here, we report that jasminin-induced endogenous TNF-α showed antiviral activity in vitro. The underlying TNF-α-inducing action of jasminin was also investigated in RAW264.7 cells. The level of endogenous TNF-α stimulated by jasminin was first analyzed by an enzyme-linked immunosorbent assay (ELISA) from the cell culture supernatant of RAW264.7 cells. The supernatants were then collected to investigate the potential antiviral effect against herpes simplex virus 1 (HSV-1). The antiviral effects of jasminin alone or its supernatants were evaluated by a plaque reduction assay. The potential activation of the PI3K-Akt pathway, three main mitogen-activated protein kinases (MAPKs), and nuclear factor (NF)-κB signaling pathways that induce TNF-α production were also investigated. Jasminin induces TNF-α protein expression in RAW264.7 cells without additional stimuli 10-fold more than the control. No significant up-expression of type I, II, and III interferons; interleukins 2 and 10; nor TNF-β were observed by the jasminin stimuli. The supernatants, containing jasminin-induced-TNF-α, showed antiviral activity against HSV-1. The jasminin-stimulated cells caused the simultaneous activation of the Akt, MAPKs, and NF-κB signal pathways. Furthermore, the pretreatment of the cells with the Akt, MAPKs, and NF-κB inhibitors effectively suppressed jasminin-induced TNF-α production. Our research provides evidence that endogenous TNF-α can be used as a strategy to encounter viral infections. Additionally, the Akt, MAPKs, and NF-κB signaling pathways are involved in the TNF-α synthesis that induced by jasminin.
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