We propose genuine （k, m）-threshold controlling schemes for controlled teleportation via multi-particle entangled states, where the teleportation of a quantum state from a sender （Alice） to a receiver （Bob） is u...We propose genuine （k, m）-threshold controlling schemes for controlled teleportation via multi-particle entangled states, where the teleportation of a quantum state from a sender （Alice） to a receiver （Bob） is under the control of m supervisors such that k （k≤ m） or more of these supervisors can help Bob recover the transferred state. By construction, anyone of our quantum channels is a genuine multipartite entangled state of which any two parts are inseparable. Their properties are compared and contrasted with those of the well-known GHZ, W, and linear cluster states, and also several other genuine multipartite entangled states recently introduced in the literature.展开更多
Since Tian Jun proposed the difference expansion embedding technique,based on which,many reversible watermarking techniques were proposed.However,these methods do not perform well when the payload is high.In this pape...Since Tian Jun proposed the difference expansion embedding technique,based on which,many reversible watermarking techniques were proposed.However,these methods do not perform well when the payload is high.In this paper,we proposed an expandable difference threshold controlled scheme for these three methods.Experiments show that our scheme improves the performance of these three methods for heavy payload.展开更多
This paper investigates a multi-component repairable system with double threshold control policy.The system is composed of n identical and independent components which operate simultaneously at the beginning,and it is...This paper investigates a multi-component repairable system with double threshold control policy.The system is composed of n identical and independent components which operate simultaneously at the beginning,and it is down when the number of operating components decreases to k−1(k≤n).When the number of failed components is less than the value L,the repairman repairs them with a low repair rate.The high repair rate is activated as soon as L failed components present,and continues until the number of failed components drops to the value N−1.Applying the matrix analytical method,the Laplace transform technique and the properties of the phase type distribution,various performance measures including the availability,the rate of occurrence of failures,and the reliability are derived in transient and stationary regimes.Further,numerical examples are reported to show the behaviour of the system.展开更多
We present a （t, .n） threshold multiparty controlled quantum teleportation protocol of an arbitrary m-qubit quantum state between two remote parties. The unknown m-qubit quantum state can be recovered by the receive...We present a （t, .n） threshold multiparty controlled quantum teleportation protocol of an arbitrary m-qubit quantum state between two remote parties. The unknown m-qubit quantum state can be recovered by the receiver under control of a subset of the n controllers if the number of the subset is larger than or equal to a threshold, say, t, but not for any t - 1 or fewer controllers. Our scheme seems to be more practical and more flexible than other existing protocols. The quantum resource required is just m Einstein-Podolsky-Rosen （EPR） pairs plus some single photons. The techniques required are only Bell state measurement, single-qubit unitary operation and yon Neumann measurement. So our scheme is also feasible with present-day technique.展开更多
In this article, a model of a weed control threshold forecast system has been established, with related model solving, data checking, database setting up, and system engineering illustration. Moreover, it is tested by...In this article, a model of a weed control threshold forecast system has been established, with related model solving, data checking, database setting up, and system engineering illustration. Moreover, it is tested by a software with data from a sugar cane planting experimental field in Yunnan, China. The methodology behind the detailed system analysis, design, and engineering has been discussed. The issue of how to create a dynamic data-dependent forecast model of a threshold forecast system, whose threshold changes according to the change of planting environment has been solved. Hence an effective solution has been initiated for further development on an agricultural expert system.展开更多
With the simultaneous rise of energy costs and demand for cloud computing, efficient control of data centers becomes crucial. In the data center control problem, one needs to plan at every time step how many servers t...With the simultaneous rise of energy costs and demand for cloud computing, efficient control of data centers becomes crucial. In the data center control problem, one needs to plan at every time step how many servers to switch on or off in order to meet stochastic job arrivals while trying to minimize electricity consumption. This problem becomes particularly challenging when servers can be of various types and jobs from different classes can only be served by certain types of server, as it is often the case in real data centers. We model this problem as a robust Markov decision process(i.e., the transition function is not assumed to be known precisely). We give sufficient conditions(which seem to be reasonable and satisfied in practice) guaranteeing that an optimal threshold policy exists. This property can then be exploited in the design of an efficient solving method, which we provide.Finally, we present some experimental results demonstrating the practicability of our approach and compare with a previous related approach based on model predictive control.展开更多
Purpose: To test the concept of Statistical Process Control (SPC) as a Quality Assurance (QA) procedure for dose verifications in external beam radiation therapy in conventional and 3D Conformal Radiotherapy (3D-CRT) ...Purpose: To test the concept of Statistical Process Control (SPC) as a Quality Assurance (QA) procedure for dose verifications in external beam radiation therapy in conventional and 3D Conformal Radiotherapy (3D-CRT) treatment of cervical cancer. Materials and Methods: A study of QA verification of target doses of 198 cervical cancer patients undergoing External Beam Radiotherapy (EBRT) treatments at two different cancer treatment centers in Kenya was conducted. The target doses were determined from measured entrance doses by the diode in vivo dosimetry. Process Behavior Charts (PBC) developed by SPC were applied for setting Action Thresholds (AT) on the target doses. The AT set was then proposed as QA limits for acceptance or rejection of verified target doses overtime of the EBRT process. Result and Discussion: Target doses for the 198 patients were calculated and SPC applied to test whether the action limits set by the Process Behavior Charts could be applied as QA for verified doses in EBRT. Results for the two sub-groups of n = 3 and n = 4 that were tested produced action thresholds which are within clinical dose specifications for both conventional AP/PA and 3D-CRT EBRT treatment techniques for cervical cancer. Conclusion: Action thresholds set by SPC were within the clinical dose specification of ±5% uncertainty for both conventional AP/PA and 3D-CRT EBRT treatment techniques for cervical cancer. So the concept of SPC could be applied in setting QA action limits for dose verifications in EBRT.展开更多
目的:通过循证医学方法系统评价电针治疗突发性耳聋的临床疗效。方法:系统检索中国知网、万方、维普、Pubmed、Embase、Web of Science、Cochrane Library数据库中自建库至2024年10月7日以来电针治疗突发性耳聋的随机对照试验,由2名研...目的:通过循证医学方法系统评价电针治疗突发性耳聋的临床疗效。方法:系统检索中国知网、万方、维普、Pubmed、Embase、Web of Science、Cochrane Library数据库中自建库至2024年10月7日以来电针治疗突发性耳聋的随机对照试验,由2名研究者参考Cochrane协作网提供的偏倚风险评估工具,采用RevMan 5.3软件进行Meta分析。结果:共纳入8篇文献,样本量为638例,试验组321例,对照组317例。Meta分析结果显示,试验组电针治疗突发性耳聋的总有效率(RR=1.23,95%CI[1.07,1.41],P=0.003)、治愈率(RR=1.73,95%CI[1.28,2.34],P=0.0004)、眩晕总有效率(RR=1.25,95%CI[0.99,1.57],P=0.06)均高于对照组;试验组平均听阈值低于对照组(MD=-6.29,95%CI[-9.01,-3.56],P<0.00001),差异均有统计学意义(P<0.05)。结论:电针治疗突发性耳聋可以提高突发性耳聋总有效率、治愈率、眩晕总有效率,改善平均听阈值。展开更多
To carry out the deep space exploration tasks near Sun-Earth Libration point L2, the CRTBP dynamic model was built up and the numerical conditional quasi-periodic orbit （Lissajons orbit） was computed near L2. Then, ...To carry out the deep space exploration tasks near Sun-Earth Libration point L2, the CRTBP dynamic model was built up and the numerical conditional quasi-periodic orbit （Lissajons orbit） was computed near L2. Then, a formation controller was designed with linear matrix inequality to overcome the difficuhy of parameter tuning. To meet the demands of formation accuracy and present thruster＇s capability, a threshold scheme was adopted for formation control. Finally, some numerical simulations and analysis were completed to demonstrate the feasibility of the proposed control strategy.展开更多
为探明栽前土壤青枯菌含量与烟草发病情况的关系及云南省植烟土壤青枯菌定量分布特征,本研究应用青枯菌复合种(Ralstonia solanacearum species complex,RSSC)的qPCR检测体系对栽前土壤中的青枯菌进行定量检测,在烟草旺长期至成熟期调...为探明栽前土壤青枯菌含量与烟草发病情况的关系及云南省植烟土壤青枯菌定量分布特征,本研究应用青枯菌复合种(Ralstonia solanacearum species complex,RSSC)的qPCR检测体系对栽前土壤中的青枯菌进行定量检测,在烟草旺长期至成熟期调查青枯病发生情况。结果表明:(1)引起烟草青枯病发生的土壤病原群体阈值为10^(3)~10^(4)基因组/g;(2)青枯菌群体数量随土层加深呈下降趋势,主要集中于40 cm以内的土层;(3)检测716份土样发现青枯菌含量在10^(4)~10~5基因组/g的样品占比最多(37.43%),其中保山市、昆明市和临沧市占比较高,分别为58.33%、51.43%、45.25%;大理州、昭通市、文山州、楚雄州及玉溪市含菌量<10^(3)基因组/g的样品占比最多,分别为62.50%、61.54%、56.04%、48.48%和41.67%;(4)夏季轮作禾本科作物的土壤青枯菌含量极显著低于连作烟田;与冬闲相比,前茬种植茄科、蓼科、十字花科作物的土壤青枯菌含量较高,而种植豆科和菊科作物则较低,但只有豆科作物显著降低了青枯菌含量。按照10^(3)~10^(4)基因组/g的风险阈值,云南省昆明市、临沧市、普洱市、曲靖市、红河州、保山市发生青枯病的风险较高,需注意防治。展开更多
基金Supported by National Natural Science Foundation of China under Grant Nos.11004050 and 10874019Key Project of Chinese Ministry of Education under Grant No.211119+2 种基金Scientific Research Fund of Hunan Provincial Education Department of China under Grant Nos.10B013 and 09A013Excellent Talents Program of Hengyang Normal University of China under Grant No.2010YCJH01Science Foundation of Hengyang Normal University of China under Grant No.10B69
文摘We propose genuine （k, m）-threshold controlling schemes for controlled teleportation via multi-particle entangled states, where the teleportation of a quantum state from a sender （Alice） to a receiver （Bob） is under the control of m supervisors such that k （k≤ m） or more of these supervisors can help Bob recover the transferred state. By construction, anyone of our quantum channels is a genuine multipartite entangled state of which any two parts are inseparable. Their properties are compared and contrasted with those of the well-known GHZ, W, and linear cluster states, and also several other genuine multipartite entangled states recently introduced in the literature.
基金the National High Technology Research and Development Program (863) of China (No.2007AA02Z452) the National Natural Science Foundation of China (Nos.30570511 and 30770589)
文摘Since Tian Jun proposed the difference expansion embedding technique,based on which,many reversible watermarking techniques were proposed.However,these methods do not perform well when the payload is high.In this paper,we proposed an expandable difference threshold controlled scheme for these three methods.Experiments show that our scheme improves the performance of these three methods for heavy payload.
基金This research was supported by the National Natural Science Foundation of China(No.71571127)the funding of V.C.&V.R.Key Lab of Sichuan Province(SCVCVR2019.05VS)the Sichuan Science and Technology Program(Nos.2020YFS0318,2019YFS0155,2019YFS0146,2020YFG0430,2020YFS0307).
文摘This paper investigates a multi-component repairable system with double threshold control policy.The system is composed of n identical and independent components which operate simultaneously at the beginning,and it is down when the number of operating components decreases to k−1(k≤n).When the number of failed components is less than the value L,the repairman repairs them with a low repair rate.The high repair rate is activated as soon as L failed components present,and continues until the number of failed components drops to the value N−1.Applying the matrix analytical method,the Laplace transform technique and the properties of the phase type distribution,various performance measures including the availability,the rate of occurrence of failures,and the reliability are derived in transient and stationary regimes.Further,numerical examples are reported to show the behaviour of the system.
基金Supported by the National Basic Research Program of China (973 Program) under Grant No.2007CB311100the National Natural Science Foundation of China under Grant No.60873191+3 种基金the National High Technology Research and Development Program of China under Grant No.2006AA01Z419the Major Research plan of the National Natural Science Foundation of China under Grant No.90604023the Scientific Research Common Program of Beijing Municipal Commission of Education under Grant No.KM200810005004the Scientific Research Foundation for the Youth of Beijing University of Technology under Grant No.97007016200701
文摘We present a （t, .n） threshold multiparty controlled quantum teleportation protocol of an arbitrary m-qubit quantum state between two remote parties. The unknown m-qubit quantum state can be recovered by the receiver under control of a subset of the n controllers if the number of the subset is larger than or equal to a threshold, say, t, but not for any t - 1 or fewer controllers. Our scheme seems to be more practical and more flexible than other existing protocols. The quantum resource required is just m Einstein-Podolsky-Rosen （EPR） pairs plus some single photons. The techniques required are only Bell state measurement, single-qubit unitary operation and yon Neumann measurement. So our scheme is also feasible with present-day technique.
文摘In this article, a model of a weed control threshold forecast system has been established, with related model solving, data checking, database setting up, and system engineering illustration. Moreover, it is tested by a software with data from a sugar cane planting experimental field in Yunnan, China. The methodology behind the detailed system analysis, design, and engineering has been discussed. The issue of how to create a dynamic data-dependent forecast model of a threshold forecast system, whose threshold changes according to the change of planting environment has been solved. Hence an effective solution has been initiated for further development on an agricultural expert system.
文摘With the simultaneous rise of energy costs and demand for cloud computing, efficient control of data centers becomes crucial. In the data center control problem, one needs to plan at every time step how many servers to switch on or off in order to meet stochastic job arrivals while trying to minimize electricity consumption. This problem becomes particularly challenging when servers can be of various types and jobs from different classes can only be served by certain types of server, as it is often the case in real data centers. We model this problem as a robust Markov decision process(i.e., the transition function is not assumed to be known precisely). We give sufficient conditions(which seem to be reasonable and satisfied in practice) guaranteeing that an optimal threshold policy exists. This property can then be exploited in the design of an efficient solving method, which we provide.Finally, we present some experimental results demonstrating the practicability of our approach and compare with a previous related approach based on model predictive control.
文摘Purpose: To test the concept of Statistical Process Control (SPC) as a Quality Assurance (QA) procedure for dose verifications in external beam radiation therapy in conventional and 3D Conformal Radiotherapy (3D-CRT) treatment of cervical cancer. Materials and Methods: A study of QA verification of target doses of 198 cervical cancer patients undergoing External Beam Radiotherapy (EBRT) treatments at two different cancer treatment centers in Kenya was conducted. The target doses were determined from measured entrance doses by the diode in vivo dosimetry. Process Behavior Charts (PBC) developed by SPC were applied for setting Action Thresholds (AT) on the target doses. The AT set was then proposed as QA limits for acceptance or rejection of verified target doses overtime of the EBRT process. Result and Discussion: Target doses for the 198 patients were calculated and SPC applied to test whether the action limits set by the Process Behavior Charts could be applied as QA for verified doses in EBRT. Results for the two sub-groups of n = 3 and n = 4 that were tested produced action thresholds which are within clinical dose specifications for both conventional AP/PA and 3D-CRT EBRT treatment techniques for cervical cancer. Conclusion: Action thresholds set by SPC were within the clinical dose specification of ±5% uncertainty for both conventional AP/PA and 3D-CRT EBRT treatment techniques for cervical cancer. So the concept of SPC could be applied in setting QA action limits for dose verifications in EBRT.
文摘目的:通过循证医学方法系统评价电针治疗突发性耳聋的临床疗效。方法:系统检索中国知网、万方、维普、Pubmed、Embase、Web of Science、Cochrane Library数据库中自建库至2024年10月7日以来电针治疗突发性耳聋的随机对照试验,由2名研究者参考Cochrane协作网提供的偏倚风险评估工具,采用RevMan 5.3软件进行Meta分析。结果:共纳入8篇文献,样本量为638例,试验组321例,对照组317例。Meta分析结果显示,试验组电针治疗突发性耳聋的总有效率(RR=1.23,95%CI[1.07,1.41],P=0.003)、治愈率(RR=1.73,95%CI[1.28,2.34],P=0.0004)、眩晕总有效率(RR=1.25,95%CI[0.99,1.57],P=0.06)均高于对照组;试验组平均听阈值低于对照组(MD=-6.29,95%CI[-9.01,-3.56],P<0.00001),差异均有统计学意义(P<0.05)。结论:电针治疗突发性耳聋可以提高突发性耳聋总有效率、治愈率、眩晕总有效率,改善平均听阈值。
文摘To carry out the deep space exploration tasks near Sun-Earth Libration point L2, the CRTBP dynamic model was built up and the numerical conditional quasi-periodic orbit （Lissajons orbit） was computed near L2. Then, a formation controller was designed with linear matrix inequality to overcome the difficuhy of parameter tuning. To meet the demands of formation accuracy and present thruster＇s capability, a threshold scheme was adopted for formation control. Finally, some numerical simulations and analysis were completed to demonstrate the feasibility of the proposed control strategy.
文摘为探明栽前土壤青枯菌含量与烟草发病情况的关系及云南省植烟土壤青枯菌定量分布特征,本研究应用青枯菌复合种(Ralstonia solanacearum species complex,RSSC)的qPCR检测体系对栽前土壤中的青枯菌进行定量检测,在烟草旺长期至成熟期调查青枯病发生情况。结果表明:(1)引起烟草青枯病发生的土壤病原群体阈值为10^(3)~10^(4)基因组/g;(2)青枯菌群体数量随土层加深呈下降趋势,主要集中于40 cm以内的土层;(3)检测716份土样发现青枯菌含量在10^(4)~10~5基因组/g的样品占比最多(37.43%),其中保山市、昆明市和临沧市占比较高,分别为58.33%、51.43%、45.25%;大理州、昭通市、文山州、楚雄州及玉溪市含菌量<10^(3)基因组/g的样品占比最多,分别为62.50%、61.54%、56.04%、48.48%和41.67%;(4)夏季轮作禾本科作物的土壤青枯菌含量极显著低于连作烟田;与冬闲相比,前茬种植茄科、蓼科、十字花科作物的土壤青枯菌含量较高,而种植豆科和菊科作物则较低,但只有豆科作物显著降低了青枯菌含量。按照10^(3)~10^(4)基因组/g的风险阈值,云南省昆明市、临沧市、普洱市、曲靖市、红河州、保山市发生青枯病的风险较高,需注意防治。
