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Blockchain-Based Certificateless Bidirectional Authenticated Searchable Encryption Scheme in Cloud Email System
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作者 Yanzhong Sun Xiaoni Du +1 位作者 Shufen Niu Xiaodong Yang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第6期3287-3310,共24页
Traditional email systems can only achieve one-way communication,which means only the receiver is allowed to search for emails on the email server.In this paper,we propose a blockchain-based certificateless bidirectio... Traditional email systems can only achieve one-way communication,which means only the receiver is allowed to search for emails on the email server.In this paper,we propose a blockchain-based certificateless bidirectional authenticated searchable encryption model for a cloud email system named certificateless authenticated bidirectional searchable encryption(CL-BSE)by combining the storage function of cloud server with the communication function of email server.In the new model,not only can the data receiver search for the relevant content by generating its own trapdoor,but the data owner also can retrieve the content in the same way.Meanwhile,there are dual authentication functions in our model.First,during encryption,the data owner uses the private key to authenticate their identity,ensuring that only legal owner can generate the keyword ciphertext.Second,the blockchain verifies the data owner’s identity by the received ciphertext,allowing only authorized members to store their data in the server and avoiding unnecessary storage space consumption.We obtain a formal definition of CL-BSE and formulate a specific scheme from the new system model.Then the security of the scheme is analyzed based on the formalized security model.The results demonstrate that the scheme achieves multikeyword ciphertext indistinguishability andmulti-keyword trapdoor privacy against any adversary simultaneously.In addition,performance evaluation shows that the new scheme has higher computational and communication efficiency by comparing it with some existing ones. 展开更多
关键词 Cloud email system authenticated searchable encryption blockchain-based designated server test multi-trapdoor privacy multi-ciphertext indistinguishability
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Mathematical model for abrasive suspension jet cutting based on orthogonal test design 被引量:5
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作者 胡贵华 朱文华 +5 位作者 蔡红霞 徐翀 柏余杰 程俊 苑进 俞涛 《Journal of Shanghai University(English Edition)》 CAS 2009年第1期37-44,共8页
This paper describes the application of orthogonal test design coupled with non-linear regression analysis to optimize abrasive suspension jet (AS J) cutting process and construct its cutting model. Orthogonal test ... This paper describes the application of orthogonal test design coupled with non-linear regression analysis to optimize abrasive suspension jet (AS J) cutting process and construct its cutting model. Orthogonal test design is applied to cutting stainless steel. Through range analysis on experiment results, the optimal process conditions for the cutting depth and the kerr ratio of the bottom width to the top width can be determined. In addition, the analysis of ranges and variances are all employed to identify various factors: traverse rate, working pressure, nozzle diameter, standoff distance which denote the importance order of the cutting parameters affecting cutting depth and the kerf ratio of the bottom width to the top width. ~rthermore, non-linear regression analysis is used to establish the mathematical models of the cutting parameters based on the cutting depth and the kerr ratio. Finally, the verification experiments of cutting parameters' effect on cutting performance, which show that optimized cutting parameters and cutting model can significantly improve the prediction of the cutting ability and quality of ASJ. 展开更多
关键词 abrasive suspension jet (AS J) orthogonal test design cutting depth the kerf ratio of the bottom width to the top width non-linear regression analysis verification experiment
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Hierarchial Strategy of Testable Design in VLSI System
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作者 Lei Xu Yihe Sun 《湖南大学学报(自然科学版)》 EI CAS CSCD 2000年第S2期129-132,共4页
With the development of VLSI technology, testing design method has been one indispensable fact of the research of VLSI design methodology. Technology of testing design can observably reduce the cost of the chip and he... With the development of VLSI technology, testing design method has been one indispensable fact of the research of VLSI design methodology. Technology of testing design can observably reduce the cost of the chip and help win in time- to-market. Conventional methods of design for test improve the testing performance of the system by modifing the gate-level architecture generally. Re-search in high-level test synthesis has been emphasized on fitting for the trend of high-level VLSI design. In this paper, based on the analysis of different types of testing design methods, a novel compound strategy of design for test in VLSI system is proposed. 展开更多
关键词 VLSI ASIC MCU Design for test Scan Register High-Level Synthesis High-Level test Synthesis
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To What Extent does the Nature of the Language Skill being Taught Influence Test Design
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作者 李维 《海外英语》 2020年第2期126-127,共2页
There are many various kinds of English language tests in the world,ranging from IELTS(International English Lan⁃guage Testing System)to TOEFL(Test of English as a Foreign Language).All these tests are designed for di... There are many various kinds of English language tests in the world,ranging from IELTS(International English Lan⁃guage Testing System)to TOEFL(Test of English as a Foreign Language).All these tests are designed for different purposes relat⁃ing to various groups of testees.Usually the English language test covers the testing of the four language skills of reading,writing,listening and speaking.The essay will discuss the relationship between the nature of four skills and the test design respectively. 展开更多
关键词 language skill test design English teaching
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Exponential System Reliability Test Design Based on Information Fusion
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作者 刘琦 张安扬 《Journal of Donghua University(English Edition)》 EI CAS 2016年第2期323-326,共4页
By analyzing the shortage of reliability test design and thinking over the producer's risk and consumer's risk, the information fusion technology is used to set up a reliability test design model( RTDM). By an... By analyzing the shortage of reliability test design and thinking over the producer's risk and consumer's risk, the information fusion technology is used to set up a reliability test design model( RTDM). By analyzing the demands and constraint conditions of the RTDM and with applications of Bayesian approach and Monte Carlo method( MCM),this paper puts forward the exponential distributed subsystems and the information fusion technology among them. According to the posteriori risk criteria,formulas of producer's risk and consumer's risk were also inferred,and with the help of Matlab software,selection of the optimum test plan was solved. Finally,validity of the model had been proved by a test of series parallel system. 展开更多
关键词 reliability test design information fusion reliability test design model(RTDM) Bayesian approach Monte Carlo method(MCM)
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Design and Test of Multibus Adapter System on a Chip for Fault Tolerant Computer Systems
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作者 Yang Yinghua, Huang Chang, Meng Biao, Zhang Xing, Yu Shan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1992年第4期5-6,2,共3页
In order to improve the system reliability and performance and to reduce the system cost, volume and weight, we have designed, fabricated and tested the multibus adapter system of a trimodular redundant fault tolerant... In order to improve the system reliability and performance and to reduce the system cost, volume and weight, we have designed, fabricated and tested the multibus adapter system of a trimodular redundant fault tolerant computer system on a single chip of 5000 gate CMOS gate array. The design, fabrication and test of this single chip system will be discussed.. 展开更多
关键词 BUS Design and test of Multibus Adapter System on a Chip for Fault Tolerant Computer Systems CHIP test
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Accelerating Life Test Scheme and Modeling Method for Machinegun
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作者 Yong-Hai SHAN Xian-Ming GAO Shi-Qi SHAN Zheng-Gang NIE 《Journal of Mathematics and System Science》 2015年第6期262-268,共7页
There is a pressing need for improving the current whole life shooting method in order to reduce ammunition consumption in the firearms lifetime test. The influencing factors, the characterization parameters and the c... There is a pressing need for improving the current whole life shooting method in order to reduce ammunition consumption in the firearms lifetime test. The influencing factors, the characterization parameters and the correlation analysis result of lifetime were considered. Accelerating life test and measuring scheme for machinegun were designed systematically by applying such theoretical methods as accelerating test, uniform design and lifetime model. As result, it provides a more scientific and reasonable accelerating life test scheme and proposes methods on modeling lifetime, optimizing model and characterizing lifetime. The conclusion can be used in preparing accelerating life test scheme and lifetime model for machinegun. 展开更多
关键词 Machinegun BARREL LIFETIME design test MODEL
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On the Analysis Method of the Triple Test Cross Design
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作者 Jin Yi(Northeast Agricultural University, Harbin 1 50030, P R C) 《Journal of Northeast Agricultural University(English Edition)》 CAS 1995年第1期66-74,共9页
The analysis method of the triple test cross design has been discussed carefully from the two factor experiment design and the genetic models of additive dominant effect and of epistasis effect.Two points different f... The analysis method of the triple test cross design has been discussed carefully from the two factor experiment design and the genetic models of additive dominant effect and of epistasis effect.Two points different from the previous reports have been concluded: (1)both the degrees of freedom of the orthogonal terms C2 and C3 are m, (2)the denominator in the F test to C2 and C3 is the error mean of square between plots. 展开更多
关键词 Triple test cross design Additive-dominant model Epistasis model Genetic parameter estimate.
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Function and Design Idea of UHVDC Test Base
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作者 Yu Yongqing, Li Guangfan, Sun Lin, Su Zhiyi and Lu Jiayu China Electric Power Research Institute Zhao Fang 《Electricity》 2009年第1期38-43,共6页
The function of the UHVDC test base of the State Grid Corporation of China (SGCC) is oriented to serve UHVDC power transmission and substation projects, especially power transmission from West China to East China, and... The function of the UHVDC test base of the State Grid Corporation of China (SGCC) is oriented to serve UHVDC power transmission and substation projects, especially power transmission from West China to East China, and to promote localization of UHVDC transmission and substation equipment. In essentials, this test base consists of UHVDC test transmission line, corona cage, outdoor test site, UHV test hall, pollution and environment laboratory, electromagnetic environment simulation test site, insulator laboratory, arrester laboratory and live equipment test field. This paper introduces the function and design idea of the test base, presents the main performance parameters of the above-mentioned test facilities, and summarizes the matters of concern when siting and planning. 展开更多
关键词 UHVDC test Function and Design Idea of UHVDC test Base DESIGN test
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Empirical Approach for Planning and Designing Constant Stress Accelerated Life Tests
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作者 蒋仁言 龙旭 《Journal of Donghua University(English Edition)》 EI CAS 2015年第6期1025-1028,共4页
Accelerated life testing(ALT)has been widely used to obtain information about the product's life characteristics at normal conditions in a relatively short period of time.Two key issues with ALT are test design an... Accelerated life testing(ALT)has been widely used to obtain information about the product's life characteristics at normal conditions in a relatively short period of time.Two key issues with ALT are test design and data analysis.The test design of constant stress ALT was studied in this paper.The test design usually combines engineering experiences with optimization models.Such approaches are hard to be implemented by practitioners.A"pure"empirical approach was presented to address this issue.With the proposed approach,some of the decision variables are determined based on the results from the literature,some of the other variables are determined based on engineering analysis and /or judgment,and the remaining variables are determined based on the empirical relations developed in this paper.A real-world example is included to illustrate the appropriateness of the proposed approach. 展开更多
关键词 accelerated life testing(ALT)design constant stress stress levels test units allocation censoring type
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Design and Evaluation of a Differential Accelerometer for Drop-Tower Equivalence Principle Test with Rotating Masses
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作者 Feng-Tian Han Tian-Yi Liu +1 位作者 Xiao-Xia He Qiu-Ping Wu 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第10期13-17,共5页
A differential accelerometer comprising of two rotating masses made of the same material is proposed for drop tower-based free-fall testing of the spin-spin force between the rotating mass and the Earth. The measureme... A differential accelerometer comprising of two rotating masses made of the same material is proposed for drop tower-based free-fall testing of the spin-spin force between the rotating mass and the Earth. The measurement is performed by placing the two concentric masses of very different momenta in a vacuum drop capsule which is falling freely in the Earth's gravitational field. A nonzero output of the differential aeeelerometer is an indication of possible violation of new equivalence principle (NEP). We present the conceptual design of a modified free-fall NEP experiment which can be performed at the Belting drop tower. Design and evaluation of the differential accelerometer with a hybrid electrostatic/magnetic suspension system are presented to accommodate for operation on ground and drop-tower tests. Details specific to the measurement uncertainty are discussed to yield an NEP test accuracy of 7.2×10^-9. 展开更多
关键词 TM Design and Evaluation of a Differential Accelerometer for Drop-Tower Equivalence Principle test with Rotating Masses NEP
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Ministries Design Exchange Rate Stress Test for Labor-Intensive Industries
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《China Textile》 2010年第3期19-19,共1页
China’s Ministry of Commerce(MOFCOM)and the Ministry of Industry and Information Technology(MIIT)have designed a stress-test for China’s labor-intensive industries,
关键词 DESIGN Ministries Design Exchange Rate Stress test for Labor-Intensive Industries RATE test
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Preliminary Design of ITER Test Blanket Module HC-SB Structure
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作者 YUAN Tao FENG Kaiming 《Southwestern Institute of Physics Annual Report》 2005年第1期95-97,共3页
The helium cooled solid breeder blanket that represents the main stream in relevant blanket concepts. It is considered as one of the main options for the fusion reactor. This concept have advantage as follows: ( 1 ... The helium cooled solid breeder blanket that represents the main stream in relevant blanket concepts. It is considered as one of the main options for the fusion reactor. This concept have advantage as follows: ( 1 ) structure simpleness and stability, ( 2 ) no effect of MHD, ( 3 ) a good compatibility in different materials. 展开更多
关键词 test blanket Conceptual design
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An Analysis of a Writing Test in a Chinese Senior High School
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作者 倪庆荣 《疯狂英语(教师版)》 2013年第2期89-95,共7页
This paper analyzes the design and implementation of a normal writing test in a senior high school. In line with theories of test evaluation, an effective writing test should try to meet the balance of the six usefuln... This paper analyzes the design and implementation of a normal writing test in a senior high school. In line with theories of test evaluation, an effective writing test should try to meet the balance of the six usefulness, which will be discussed in this paper; thereafter, pedagogical implications will be mentioned with an emphasis on how a test affects the teachers in changing their teaching approaches and motivates the learners in achieving higher goals in their writing proficiency. 展开更多
关键词 evaluation of the writing test English writing proficiency design and development of a test
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Parameters Sensitivity Characteristics of Highly Integrated Valve-Controlled Cylinder Force Control System 被引量:8
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作者 Kai-Xian Ba Bin Yu +4 位作者 Xiang-Dong Kong Chun-He Li Qi-Xin Zhu Hua-Long Zhao Ling-Jian Kong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2018年第2期159-175,共17页
Nowadays, a highly integrated valve?controlled cylinder(HIVC) is applied to drive the joints of legged robots. Although the adoption of HIVC has resulted in high?performance robot control, the hydraulic force system s... Nowadays, a highly integrated valve?controlled cylinder(HIVC) is applied to drive the joints of legged robots. Although the adoption of HIVC has resulted in high?performance robot control, the hydraulic force system still has problems, such as strong nonlinearity, and time?varying parameters. This makes HIVC force control very diffcult and complex. How to improve the control performance of the HIVC force control system and find the influence rule of the system parameters on the control performance is very significant. Firstly, the mathematical model of HIVC force control system is established. Then the mathematical expression for parameter sensitivity matrix is obtained by applying matrix sensitivity analysis(PSM). Then, aimed at the sinusoidal response under(three factors and three levels) working conditions, the simulation and the experiment are conducted. While the error between the simulation and experiment can’t be avoided. Therefore, combined with the range analysis, the error in the two performance indexes of sinusoidal response under the whole working condition is analyzed. Besides, the sensitivity variation pattern for each system parameter under the whole working condition is figured out. Then the two sensitivity indexes for the three system parameters, which are supply pressure, proportional gain and initial displacement of piston, are proved experimentally. The proposed method significantly reveals the sensitivity characteristics of HIVC force control system, which can make the contribution to improve the control performance. 展开更多
关键词 Highly integrated valve?controlled cylinder system Force control system Matrix sensitivity analysis Orthogonal test design Sensitivity index
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Study on l uidity of squeeze cast AZ91D magnesium alloy with dif erent wall thicknesses 被引量:1
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作者 Chen Yun Luo Jixiang +1 位作者 Du Juan Chen Dingfang 《China Foundry》 SCIE CAS 2014年第2期115-118,共4页
Rectangular cross-section specimens with different section thicknesses were prepared to study the influences of pouring temperature, mould temperature and squeeze velocity on the fluidity of squeeze cast AZ91D magnesi... Rectangular cross-section specimens with different section thicknesses were prepared to study the influences of pouring temperature, mould temperature and squeeze velocity on the fluidity of squeeze cast AZ91D magnesium alloy by means of orthogonal test design method. The results show that pouring temperature, mould temperature and squeeze velocity can significantly affect the fluidity of magnesium alloy specimens with wall thickness no more than 4 ram, and the pouring temperature is the most influential factor on the fluidity of specimens with wall thickness of 1, 2 and 3 mm, while mould temperature is the one for specimens with wall thickness of 4 mm. Increasing pouring temperature between 700 ℃ and 750 ℃ is beneficial to the fluidity of AZ91D magnesium alloy, and increasing mould temperature significantly enhances the filling ability of thick (3 and 4 mm) section castings. The fluidity of squeeze cast magnesium alloy increases with the increase of wall thickness. It is not recommended to produce magnesium alloy casting with wall thickness of smaller than 3 mm by squeeze cast process due to the poor fluidity. The software DPS was used to generate the regression model, and linear regression equations of the fluidity of squeeze cast AZ91D with different wall thicknesses are obtained using the test results. 展开更多
关键词 FLUIDITY magnesium alloy squeeze casting orthogonal test design
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Seismic performances of dyke on liquefiable soils 被引量:1
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作者 Mingwu Wang Guangyi Chen Susumu Iai 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2013年第4期294-305,共12页
Various field investigations of earthquake disaster cases have confirmed that earthquake-induced liquefaction is a main factor causing significant damage to dyke,research on seismic performances of dyke is thus of gre... Various field investigations of earthquake disaster cases have confirmed that earthquake-induced liquefaction is a main factor causing significant damage to dyke,research on seismic performances of dyke is thus of great importance.In this paper,seismic responses of dyke on liquefiable soils were investigated by means of dynamic centrifuge model tests and three-dimensional(3D) effective stress analysis method which is based on a multiple shear mechanism model and a liquefaction front.For the prototype scale centrifuge tests,sine wave input motions with peak accelerations 0.806 m/s2,1.790 m/s2 and 3.133 m/s2 of varied amplitudes were adopted to study the seismic performances of dyke on the saturated soil layer foundation with relative density of approximately 30%.Then,corresponding numerical simulations were conducted to investigate the distribution and variations of deformation,acceleration,excess pore-water pressure(EPWP),and behaviors of shear dilatancy in the dyke and the liquefiable soil foundation.Moreover,detailed discussions and comparisons between numerical simulations and centrifuge tests were also presented.It is concluded that the computed results have a good agreement with the measured results by centrifuge tests.The physical and numerical models both indicate that the dyke hosted on liquefiable soils subjected to earthquake motions has exhibited larger settlement and lateral spread:the stronger the motion is,the larger the dyke deformation is.Compared to soils in the deep ground under the dyke and the free field,the EPWP ratio is much smaller in the shallow liquefiable soil beneath the dyke in spite of large deformation produced.For the same overburden depth soil from free site and the liquefiable foundation beneath dyke,the characteristics of effective stress path and stress-strain relations are different.All these results may be of theoretical and practical significance for seismic design of the dyke on liquefiable soils. 展开更多
关键词 Dyke Dynamic centrifuge test Effective stress analysis Liquefaction Seismic design Seismic responses
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Chinese Herbs as an Example for a New Class of Feed Ingredients in Aquatic Animal Diets
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作者 Yan CHEN Jingru CHEN +3 位作者 Bing CHEN Jun MA Hai HUANG Qilin LI 《Agricultural Biotechnology》 CAS 2021年第6期73-78,共6页
Chinese herbal flavonoids play a role in improving the health of aquatic animals and optimizing the quality of aquatic products.The efficient extraction of flavonoids is beneficial to deepening the application of flav... Chinese herbal flavonoids play a role in improving the health of aquatic animals and optimizing the quality of aquatic products.The efficient extraction of flavonoids is beneficial to deepening the application of flavonoids in aquatic products.To explore the optimal way of flavonoid extraction has become a hot research topic.In this study,based on temperature,ultrasonic power and extraction time,the best ways to extract flavonoids from four Chinese herbal medicines,purslane,Verbena,Fructus Amomi and Alpinia oxyphylla,were explored.Through single-factor and multi-factor optimization extraction,the most appropriate conditions for flavonoid extraction were obtained.The results showed that the best way of ultrasonic assisted extraction of flavonoids was purslane at 40℃,300 W(400 W),Verbena at 70℃,400W,Fructus Amomi at 50℃,200 W,and A.oxyphylla at 40℃,400W,and 40 min.The results of orthogonal design showed that purslane could get 13.20 mg/g at 40℃,400 W and 50 min,Verbena could get 10.23 mg/g at 60℃,300 W and 30 min,Fructus Amomi could get 8.18 mg/g at 50℃,300 W and 60 min,and A.oxyphylla could get 7.31 mg/g at 30℃,300 W and 50 min. 展开更多
关键词 Chinese herbal medicine FLAVONOIDS Ultrasonic assisted extraction Orthogonal test design
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Study on influencing factors of Baosteel’s swirl-jet sintering FGD technology
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作者 LIU Daoqing SHEN Xiaolin SHI Lei 《Baosteel Technical Research》 CAS 2013年第1期39-43,共5页
This paper introduced the research background and technical features of Baosteel' s sintering flue gas desulfurization (FGD). It was also named swirl-jet-absorbing wet limestone-gypsum sintering FGD technology. By ... This paper introduced the research background and technical features of Baosteel' s sintering flue gas desulfurization (FGD). It was also named swirl-jet-absorbing wet limestone-gypsum sintering FGD technology. By means of industrial online pilot plants, through continuous running and orthogonal tests, the effects of various influencing factors on SO2 removal efficiency of Baosteel sintering flue gas desulgurization (BSFGD) were studied carefully. The results indicate that the slurry pH value,temperature (T) and flow rate (Q) of inlet flue gas,liquid level (H) in the absorber and flue gas jet velocity (V) are the main influencing factors. Furthermore, when pH is between 5.0 and 5.5, H is between 4.2 m and 4.3 m, Q is 43 000 m3/h, T is below 65℃ and V is between 20 m/s and 28 m/s, the best desulfurization efficiency can be available. 展开更多
关键词 sintering flue gas desulfiarization efficiency (SO2 removal efficiency) orthogonal test design
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Usability and Effectiveness of Mobile Learning Course Content Application as a Revision Tool
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作者 Ahmad Sobri Hashim Wan Fatimah Wan Ahmad Rohiza Ahmad 《Computer Technology and Application》 2011年第2期148-157,共10页
The use of mobile phone technologies in the education sector is getting more attention nowadays. This is due to the advancement of technologies equipped in majority of the mobile phones which makes the devices become ... The use of mobile phone technologies in the education sector is getting more attention nowadays. This is due to the advancement of technologies equipped in majority of the mobile phones which makes the devices become more capable of supporting the learning and teaching activities. Mobile learning (m-learning) is a learning tool which can be run on mobile devices. It can be considered as an enhancement to the electronic learning (e-learning). M-learning overcomes several limitations of e-learning especially in term of mobility. It provides more independent way of learning whereby learners can use the application to do the learning activities at anytime and any place. However, as with other learning and teaching applications, applications to be developed for mobile learning must also be developed based on certain learning theories and guidelines in order for them to be effective as well as usable. Therefore, in this paper, the development process of a mobile learning course content application called Mobile System Analysis and Design (MOSAD) as a revision tool will be shared and its testing's conduct and results will also be presented and discussed. MOSAD was developed with the content of a topic from the System Analysis and Design (SAD) course conducted at Universiti Teknologi PETRONAS (UTP). A heuristic test involving 5 experts in the area of Human Computer Interaction (HCI) were conducted after the first version of MOSAD was completed to strengthen its functionality and usability, followed by a Post Test Quasi Experimental Design which was conducted to 116 UTP second year students who took the SAD course to test the effectiveness and usability of MOSAD after it was revised. As a result from the post test, the students who had used MOSAD (66 out of the 116 students) as their revision tool for answering ten quiz questions obtained a mean score of 7.7576 as compared to 5.160 obtained by the other group of students (50 out of the 116 students) who used traditional methods of revision. Besides, usability test which tested on consistency, leamability, flexibility, minimal action and minimal memory load of MOSAD gave results above 3.5 for each metric based on the rating of 1 to 5. Thus, both results indicate that MOSAD is effective and usable as a revision tool for the higher education students. 展开更多
关键词 Mobile learning electronic learning HEURISTIC post test quasi experimental design usability.
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