1,018 research outputs found
Wi-attack: Cross-technology Impersonation Attack against iBeacon Services
iBeacon protocol is widely deployed to provide location-based services. By
receiving its BLE advertisements, nearby devices can estimate the proximity to
the iBeacon or calculate indoor positions. However, the open nature of these
advertisements brings vulnerability to impersonation attacks. Such attacks
could lead to spam, unreliable positioning, and even security breaches. In this
paper, we propose Wi-attack, revealing the feasibility of using WiFi devices to
conduct impersonation attacks on iBeacon services. Different from impersonation
attacks using BLE compatible hardware, Wi-attack is not restricted by
broadcasting intervals and is able to impersonate multiple iBeacons at the same
time. Effective attacks can be launched on iBeacon services without
modifications to WiFi hardware or firmware. To enable direct communication from
WiFi to BLE, we use the digital emulation technique of cross technology
communication. To enhance the packet reception along with its stability, we add
redundant packets to eliminate cyclic prefix error entirely. The emulation
provides an iBeacon packet reception rate up to 66.2%. We conduct attacks on
three iBeacon services scenarios, point deployment, multilateration, and
fingerprint-based localization. The evaluation results show that Wi-attack can
bring an average distance error of more than 20 meters on fingerprint-based
localization using only 3 APs.Comment: 9 pages; 26 figures; 2021 18th Annual IEEE International Conference
on Sensing, Communication, and Networking (SECON), 202
护理安全品管圈在血管外科护理中的应用效果
Objective: To study the effects of nursing safety quality control circle in the nursing in department of vascular surgery. Methods: Totally 230 patients in vascular surgery department from January 2015 to January 2016 were randomly divided into 2 groups. Assessment the risk factors of disease for each patient , 115 cases in the control group, the shift nurses nurse by traditional method; 115 cases in experimental group ,who were given quality control circle to improve the nursing quality., and the adverse event and compliance,satisfaction to nurses of the patients were compared. Results: The incidence of adverse events and complications (6%) in the experimental group were lower than those in the control group (15.5%). The patients' satisfaction with nurses' job (97.4%) was higher than that of the control group (87%). Conclusion: The implementation of nursing safety quality control circle activities in vascular surgery nursing, effectively reduce the incidence of adverse events and complications during hospitalization, improve the quality of nursing and help patients recover soon.目的 探讨护理安全品管圈在血管外科护理中的应用效果。方法 随机选取2015年1月—2016年1月在本科住院患者230例并随机将其分为两组,对每位患者进行疾病危险因素评估,对照组115例,各交接班护士采用传统护理方法;实验组115例,对患者实施护理安全品管圈活动提高护理质量,比较两组的不良事件和并发症的发生率、患者对护士工作的满意度、患者住院天数。结果 实验组不良事件和并发症的发生率(6%)均低于对照组(15.5%);患者对护士工作的满意度(97.4%)高于对照组(87%),住院天数较对照组也大大缩短。结论 在血管外科护理中实施护理安全品管圈活动,有效的降低了患者住院期间不良事件和并发症的发生率,提高了护理质量,有助于患者早日康复
Progress on two-dimensional ferrovalley materials
The electron's charge and spin degrees of freedom are at the core of modern
electronic devices. With the in-depth investigation of two-dimensional
materials, another degree of freedom, valley, has also attracted tremendous
research interest. The intrinsic spontaneous valley polarization in
two-dimensional magnetic systems, ferrovalley material, provides convenience
for detecting and modulating the valley. In this review, we first introduce the
development of valleytronics. Then, the valley polarization forms by the p, d,
and f-orbit that are discussed. Following, we discuss the investigation
progress of modulating the valley polarization of two-dimensional ferrovalley
materials by multiple physical fields, such as electric, stacking mode, strain,
and interface. Finally, we look forward to the future developments of
valleytronics.Comment: 13 pages, 12 figures Accepted Chinese Physics B (2023) [Invited
review
Purin-6-One Derivatives as Phosphodiesterase-2 Inhibitors
A series of purin-6-one derivatives were synthesized, and their in vitro inhibitory activity against phosphodiesterase-2 (PDE2) was evaluated by using a fluorescence polarization assay. Three compounds, that are, 2j, 2p, and 2q, showed significant inhibitory activity against PDE2 with IC50 values of 1.73, 0.18, and 3.43 μM, respectively. Structure-activity relationship (SAR) analysis was performed to explore the relationship between the chemical structures of these compounds and their inhibitory activity. Compounds 2j, 2p, and 2q were further selected for molecular docking study. The docking results suggested that these ligands bind with hydrophobic pockets of the catalytic active site of PDE2, where a Tyr655 residue was found to be important in binding with compound 2p, the most potent inhibitor identified in this study. Our present study provides useful information for the future design of novel PDE2 inhibitors
CP asymmetry from resonance effect of B meson decay process with and K final states
We introduce the new resonance of , which produces some new strong phase associated with vector meson
resonance and thus can cause relatively large CP asymmetry at the range of
interferences. There are the resonances of , and due to the mixing
of vector mesons , , . We calculate the CP asymmetry from
the decay modes of . Meanwhile, the localised CP
asymmetries are presented and some detailed analysis can be found. The CP
asymmetry from the decay mode of is also presented in our framework which is well consisted
with LHC experiment. The introduced CP asymmetry can provide a favorable
theoretical support for the experimental exploration in the future
- …