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2022 ◽  
Vol 123 ◽  
pp. 104299
Author(s):  
Megan O. Kelly ◽  
Tyler M. Ensor ◽  
Xinyi Lu ◽  
Colin M. MacLeod ◽  
Evan F. Risko

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Shaobo Wang ◽  
Yujia Liu

This exploration is aimed at quickly obtaining the spatial position information of microseismic focal points and increasing the accuracy of microseismic rapid positioning, to take timely corresponding measures. A microseismic focal point location system completely different from the traditional microseismic location method is proposed. The search engine technology is introduced into the system, which can locate the microseismic focal point quickly and accurately. First, the propagation characteristics of microseismic signals in coal and rock layers are analyzed, and the focal position information is obtained. However, the collected microseismic signal of the coal mine contains noise, so it is denoised at first. Then, a waveform database is established for the denoised waveform data and focal point position. The structure and mathematical model of the location-sensitive hash (LSH) based on P stable distribution are introduced and improved, and the optimized algorithm multiprobe LSH is obtained. The microseismic location model is established according to the characteristics of microseismic data. The values of three parameters, hash table number, hash function family dimension, and interval size, are determined. The experimental data of the parameters of the search engine algorithm are analyzed. The results show that when the number of hash tables is 6, the dimension k of the hash function family is 14, and the interval size W is 8000, the retrieval time reaches a relatively small value, the recall rate reaches a large value, and the proportion of retrieved candidates is large; the parameters of the search engine algorithm of the measured coal mine microseismic data are analyzed. It is obtained that when the number of hash tables is 4, the dimension k of the hash function family is 6, and the interval size W is 500, the retrieval time reaches a relatively small value, the recall rate obtains a large value, and the proportion of retrieved candidates is large. The contents studied are of great significance to the evaluation of destructive mine earthquakes and impact risk.


2021 ◽  
Vol 1201 (1) ◽  
pp. 012026
Author(s):  
Ø Karlsen ◽  
H G Lemu

Abstract A questionnaire-based survey has been performed among original equipment manufacturers (OEMs), sub-suppliers, engineering companies, end-users, service & maintenance, and “others”, as part of an investigation to clarify their relationship to expanding pin system, compared to standard, cylindrical pins. In addition, a short literature study on onshore cranes is conducted. The survey is based on 9 questions about safety for personnel and machine, breakage, and wear of pins and supports, and installation and retrieval easiness of pins. The analysis of the responses indicates that safety for personnel and machines/equipment is regarded mainly as either “Important” or “Crucial and decisive”, and that the expanding pin solution is regarded as “better” or “equal” compared to the standard, cylindrical pin, both for “safety level”, “risk for breakage of pin & support”, “tear & wear on pin & support” and “installation and retrieval time”.


2021 ◽  
Vol 506 (1-2) ◽  
Author(s):  
Ho Nguyen Anh Tuan ◽  
Pham Dang Dieu ◽  
Nguyen Dao Xuan Hai ◽  
Nguyen Truong Thinh ◽  
Le Gia Vinh

The operating of the anthropometric identification supported byConvolution Neural Network system is to locate precious anthropology spots and certaindistances between each feature area on a person's face. Identifies the anthropometricpoints from 2D captured pictures by 3 perspective views promised an implementation between medical diagnostics to solve the problem of data retrieval time and efficiency compared to other manual measures.


2021 ◽  
Vol 8 ◽  
Author(s):  
Tianjian Lu ◽  
Ruoxi Zhang ◽  
Kexin Jiang ◽  
Zihuai Wang ◽  
Xiaohu Hao ◽  
...  

Background: Electrocautery and staplers are regarded as the two most common surgical instruments for dissecting the intersegmental plane in segmentectomy. We performed a meta-analysis to compare electrocautery and staplers in terms of their safety and effects.Methods: A systematic search strategy was performed using PubMed, and the retrieval time was up to April 1, 2020. Odds ratio (OR) and mean differences (MDs) with 95% CI were applied to determine the effectiveness of dichotomous or continuous variables, respectively.Results: Six studies including 385 patients were included. The electrocautery had a higher incidence rate of postoperative complication [OR= 1.92, 95% CI (1.12, 3.28), P = 0.02)] and air leak [OR: 3.91, 95% CI (1.64, 9.35), P = 0.002)]. No significant difference was found in the comparison of surgery time, blood loss, and duration of tube days or hospitality days.Conclusions: Our study indicated that patients under segmentectomy were associated with better safety by using stapler than electrocautery in the reduction of postoperative complications.


Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4477
Author(s):  
Htet Htet Hlaing ◽  
Yuki Funamoto ◽  
Masahiro Mambo

NDN is one of the new emerging future internet architectures which brings up new solutions over today’s internet architecture, facilitating content distribution, in-network caching, mobility support, and multicast forwarding. NDNs ubiquitous in-network caching allows consumers to access data directly from the intermediate router’s cache. However, it opens content privacy problems since data packets replicated in the router are always accessible by every consumer. Sensitive contents in the routers should be protected and accessed only by authorized consumers. Although the content protection problem can be solved by applying an encryption-based access control policy, it still needs an efficient content distribution scheme with lower computational overhead and content retrieval time. We propose an efficient and secure content distribution (ES_CD), by combining symmetric encryption and identity-based proxy re-encryption. The analysis shows that our proposed scheme achieves content retrieval time reduction up to 20% for the cached contents in our network simulation environment and a slight computational overhead of less than 19 ms at the content producer and 9 ms at the consumer for 2 KB content. ES_CD provides content confidentiality and ensures only legitimate consumers can access the contents during a predefined time without requiring a trusted third party and keeping the content producer always online.


Author(s):  
Varisha Alam ◽  

The word biometrics is derived from the Greek words 'bios' and 'metric' which means living and calculation appropriately. Biometrics is the electronic identification of individuals based on their physiological and biological features. Biometric attributes are data take out from biometric test which can be used for contrast with a biometric testimonial. Biometrics composed methods for incomparable concede humans based upon one or more inherent material or behavioral characteristics. In Computer Science, bio-metrics is employed as a kind of recognition access management and access command. Biometrics has quickly seemed like an auspicious technology for attestation and has already found a place in the most sophisticated security areas. A systematic clustering technique has been there for partitioning huge biometric databases throughout recognition. As we tend to are still obtaining the higher bin-miss rate, so this work is predicated on conceiving an ordering strategy for recognition of huge biometric database and with larger precision. This technique is based on the modified B+ tree that decreases the disk accesses. It reduced the information retrieval time and feasible error rates. The ordering technique is employed to proclaims a person’s identity with a reduced rate of differentiation instead of searching the whole database. The response time degenerates, further-more because the accuracy of the system deteriorates as the size of the database increases. Hence, for vast applications, the requirement to reduce the database to a little fragment seems to attain higher speeds and improved accuracy.


2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Benxia Zheng ◽  
Zheng Mei ◽  
Liangyu Hou ◽  
Shuoli Qiu

Aiming at the problems of long retrieval time of sports tourism data, high integration error of sports tourism data, and high energy consumption of sports tourism service management in traditional methods, the application of Internet of Things and edge computing technology in sports tourism services is proposed. We established a sports tourism service application model based on Internet technology to realize the functions of sports tourism service internal management control, external collaboration, and information release. We calculated the similarity of sports tourism resources from the two levels of feature words and the environment where the sports tourism resources are located. According to the calculation results, the edge computing method is used to realize the integration of sports tourism service resources to improve the application effect of sports tourism service application models. The experimental results show that the minimum data retrieval time of the proposed method is only 2.35s. The sports tourism data fusion error is low. The management energy consumption is small, which significantly improves the existing problems and fully verifies the practical application value of the method.


Author(s):  
Shubhangi N. Ghate ◽  
Dr. Mangesh Nikose

To improve the repeatability of SIFT and SURF descriptors, we conducted research to find two methods: first, a method for pre-processing underwater images that does not require prior knowledge of the scene, and second, a method for computing distances that is less expensive in terms of execution time for finding corresponding points. SIFTs (Scale and Rotation Invariant Features) are new features that have been developed. SIFTs (Scale and Rotation Invariant Features) are newly developed features that are based on geometrical constraints between pairs of nearby points around a key point. SIFT is contrasted with cutting-edge local features. SIFT outperforms the state-of-the-art in terms of retrieval time and retrieval accuracy. We have discussed the time required to extract key point features of SIFT and SURF Descriptor.


2021 ◽  
pp. 112067212199890
Author(s):  
Ning Yang ◽  
Junxing Bai ◽  
Li Liu

Objective: To evaluate the effect of low concentration atropine combined with Orthokeratology (OK) lens compared with the OK lens on the changes of axial length in children with moderate and low myopia by meta-analysis. Methods: Databases such as PubMed, Web of Science, Embase, and Cochrane Library were comprehensively searched to collect related studies on atropine combined with the OK lens in the treatment of children with moderate and low myopia. The retrieval time was from the establishment of the database to December 2020. The standardized mean difference (SMD) and its 95% confidence interval (CI) were selected as the effect to analyze the changes of the axial length of the eye axis in children with low and moderate myopia treated with low concentration atropine combined with OK lens. Results: A total of eight articles were included in this study. Compared with OK lens treatment, low concentration atropine combined with the OK lens significantly slowed down the axial elongation of low and moderate myopia, SMD = −0.68(95% CI: −0.86–−0.50, p < 0.05). According to the subgroup analysis of treatment time, when the treatment time was less than or equal to 6 months, SMD = −0.63(95% CI: −0.88–−0.37, p < 0.05), when the treatment time was 1 year, SMD = −0.76(95% CI: −1.08–−0.43, p < 0.05), and when the treatment time was 2 years, SMD = −0.69(95% CI: −1.07–−0.31, p < 0.05). Conclusion: Low concentration atropine combined with the OK lens is more effective than the OK lens in the treatment of children with low to moderate myopia in reducing axial elongation.


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