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基于机器视觉和随机方法的作物行提取算法 被引量:25
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作者 姜国权 柯杏 +1 位作者 杜尚丰 陈娇 《农业机械学报》 EI CAS CSCD 北大核心 2008年第11期85-88,93,共5页
根据农田作物图像特点,采用基于垂直投影的窗口移动方法,得到代表作物行的定位点,提出了基于机器视觉和随机方法的作物行提取算法。该算法从定位点中随机选取2个不同点,决定一条候选直线,再根据阈值规则,进一步判断候选直线的真实性。... 根据农田作物图像特点,采用基于垂直投影的窗口移动方法,得到代表作物行的定位点,提出了基于机器视觉和随机方法的作物行提取算法。该算法从定位点中随机选取2个不同点,决定一条候选直线,再根据阈值规则,进一步判断候选直线的真实性。实验结果表明,该算法可以提取不同作物的作物行,处理一幅640×480像素的彩色图像平均需要220ms,正确识别率达98%。 展开更多
关键词 作物行提取 机器视觉 随机方法 HOUGH变换
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主余震序列作用下非线性单自由度体系的增量损伤分析 被引量:17
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作者 于晓辉 乔雨蒙 +2 位作者 代旷宇 陶静 吕大刚 《工程力学》 EI CSCD 北大核心 2019年第3期121-130,共10页
同时采用真实主余震序列和人工构造主余震序列作为输入,开展了非线性单自由度体系在主余震序列作用下的增量损伤分析。挑选75组真实主余震序列,并基于相同的主震记录,分别采用重复法、随机法和衰减法构造不同的人工主余震序列作为输入... 同时采用真实主余震序列和人工构造主余震序列作为输入,开展了非线性单自由度体系在主余震序列作用下的增量损伤分析。挑选75组真实主余震序列,并基于相同的主震记录,分别采用重复法、随机法和衰减法构造不同的人工主余震序列作为输入。分别采用理想弹塑性模型、考虑屈服后刚度的双线型模型和三线型模型,开展主余震序列作用下非线性单自由度体系的反应分析。以修正的Park-Ang损伤指数作为结构损伤指标,对主余震序列作用下的结构增量损伤进行研究,并对强度折减系数、恢复力模型及主余震序列人工构造方法对增量损伤的影响进行研究。结果表明:余震造成的结构增量损伤不可忽视。基于重复法和随机法合成的人工主余震序列相比真实主余震序列的余震强度偏大,因此会高估余震对结构造成的增量损伤。基于衰减法合成的人工主余震序列的余震强度偏小,会低估余震对结构造成的增量损伤。结构特性对增量损伤的影响很小,体现为不同强度折减系数及不同恢复力模型对结构增量损伤的影响均不明显。 展开更多
关键词 主余震序列 增量损伤 单自由度体系 重复法 随机法 衰减法
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Effectiveness of Jinying capsule on pelvic inflammatory disease in patients with symptom pattern of damp and heat accumulation: a double-blinded, multicenter, randomized, placebo-controlled clinical trial 被引量:11
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作者 Yang Yan Lu Yao +7 位作者 Zhou Deping Pei Fenglan Li Qin Chen Shuqiong Wang Qiufeng Wang Yanting Jin Zhe Liu Yanxia 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2020年第3期432-439,共8页
OBJECTIVE: To evaluate the therapeutic effectiveness and safety of Jinying capsule on pelvic inflammatory disease(PID) in patients with symptoms identified as the pattern of damp and heat accumulation in terms of Trad... OBJECTIVE: To evaluate the therapeutic effectiveness and safety of Jinying capsule on pelvic inflammatory disease(PID) in patients with symptoms identified as the pattern of damp and heat accumulation in terms of Traditional Chinese Medicine(TCM).METHODS: We conducted a double-blinded, multicenter, randomized, placebo-controlled clinical trial which included 155 patients diagnosed with PID and identified as symptom pattern of damp and heat accumulation. They were randomly divided into experimental group(n = 78) and control group(n = 77) according to a random number table. The treatment lasted for a period of 28 d. The experimental group was given Jinying capsules and oral levofloxacin plus oral metronidazole for first 7 d.They continued with Jinying capsules and levofloxacin placebo and metronidazole placebo for another 7 d. For the remaining 14 d, they continued with Jinying capsules only. Whereas, the control group was treated with oral levofloxacin and metronidazole and Jinying capsule placebo for the first 14 d in the same way as the experimental group and then continued with Jinying capsule placebo only for the remaining 14 d. The clinical efficacy was assessed using McCormack scale, TCM symptom pattern scores, physicochemical indexes including white blood cell and erythrocyte sedimentation rate, C-reaction protein, smear of vaginal discharge,and pelvic ultrasound.RESULTS: Comparing McCormack scale between both groups after treatment, the difference in curative effect between both groups was significant (P = 0.0269). The cure rate of the experimental group and control group is 76.32% and 59.46% respectively at week 4. Comparing TCM symptom pattern scores between both groups before and after treatment, the differences in total effective rate were both significant(P < 0.05). The curative effect rate of experimental group is 2.63% and 13.70% of the control group at week 1(P = 0.0131), and73.33% of the experimental group and 56.94% of the control group at week 4(P = 0.0369). No significant differences were found 展开更多
关键词 Pelvic inflammatory disease Dampness-heat Therapeutic uses Safety randomized controlled trial Double-blind method Jinying capsule
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随机算法的一般性原理 被引量:5
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作者 贺红 马绍汉 《计算机科学》 CSCD 北大核心 2002年第1期90-92,共3页
最近十几年来,国际上对随机算法(randomized algorithm)的研究有了巨大进展.在此期间,随机算法从一个计数理论的工具发展到今天在许多类型的算法中都得到了广泛应用,显示了随机算法本身强大的生命力.
关键词 随机算法 一般性原理 LasVegas算法 MonteCarlo算法 NP问题 计算机
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Efficacy of Zhenjingdingzhi decoction in treating insomnia with Qi-deficiency of heart and gallbladder:a randomized,double-blind,controlled trial 被引量:8
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作者 Ye Qing Zhou Jie +2 位作者 Yuan Xiaolei Yuan Canxing Yang Xuming 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2015年第4期381-388,共8页
OBJECTIVE: To evaluate the clinical efficacy of Zhenjingdingzhi decoction in treating insomnia with Qi-deficiency of heart and gallbladder.METHODS: We conducted a double-blind,randomized,controlled trial involving 100... OBJECTIVE: To evaluate the clinical efficacy of Zhenjingdingzhi decoction in treating insomnia with Qi-deficiency of heart and gallbladder.METHODS: We conducted a double-blind,randomized,controlled trial involving 100 patients with insomnia of Qi-deficiency of heart and gallbladder.Patients were randomly divided into the treatment group(n = 50) and the control group(n = 50) according to a random number table. The treatment group was given Zhenjingdingzhi decoction,while the control group was treated with Suanzaoren decoction. the pharmacological treatment lasted for 8weeks. The clinical efficacy was assessed by using Spiegel scale,Pittsburgh sleep quality index(PSQI)and Traditional Chinese Medicine(TCM) syndrome scores.RESULTS: Comparing Spiegel scores between the two groups at 4 and 8 weeks,the differences in curative effect between the two groups were both significant(both P < 0.05). The total effective rate was46% in the treatment group and 27.7% in the control group at 4 weeks,and 80% and 53.2% at 8weeks,respectively; After 8 weeks,PSQI scores showed that the total effective rates differed significantly between the two groups(P < 0.01): 84% in the treatment group and 59.6% in the control group; In improving sleep quality and sleep duration,the curative effect of the treatment group was better than that of the control group(P < 0.05).TCM syndrome,especially insomnia and palpitation,was improved better in the treatment group after 8 weeks as compared to that in the control group(P < 0.05). The total effective rate of the two groups was 84% and 66%,respectively.CONCLUSION: Zhenjingdingzhi decoction is effective and safe for the treatment of insomnia with Qi-deficiency of heart and gallbladder,especially for improving sleep quality and sleep duration. 展开更多
关键词 Sleep initiation and maintenance disorders Shyness Heart Qi deficiency Zhenjingdingzhi decoction randomized controlled trial Double-blind method
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黄选玮针刺治疗肩周炎临床观察 被引量:8
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作者 李博文 李琳 +2 位作者 张招娣 黄选玮 陈久毅 《上海针灸杂志》 2009年第1期42-43,共2页
目的客观评价首批国家百名老中医学术经验继承人、贵阳中医学院黄选玮教授的针刺技法及选穴对肩周炎患者肩部疼痛症状及功能的改善。方法将肩周炎患者78例随机分为治疗组39例和对照组39例。两组分别于治疗前、治疗后对患者的疼痛及功能... 目的客观评价首批国家百名老中医学术经验继承人、贵阳中医学院黄选玮教授的针刺技法及选穴对肩周炎患者肩部疼痛症状及功能的改善。方法将肩周炎患者78例随机分为治疗组39例和对照组39例。两组分别于治疗前、治疗后对患者的疼痛及功能指标作详细比较。结果治疗组、对照组患者疼痛程度及功能比较差异具有统计学意义(P<0.05)。结论研究表明黄选玮教授的针刺技法及选穴对肩周炎患者肩部疼痛症状及功能的改善与对照组相比具有明显差异。 展开更多
关键词 肩周炎 随机对照 临床研究 刺法 五腧穴
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Effectiveness and safety of Jiawei Xiaoyao pill(加味逍遥丸)in the treatment of premenstrual syndrome(liver depression,spleen deficiency,and blood-heat syndrome):a multi-center,randomized,placebo-controlled trial
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作者 LI Xiyu YANG Yanhong +8 位作者 SUN Jian NIE Quanfang LIU Lifen LI Guifen YU Junping ZHANG Zhuangjin XU Yi ZOU Ting SHI Yun() 《Journal of Traditional Chinese Medicine》 SCIE CSCD 2024年第2期373-380,共8页
OBJECTIVE:To investigate the effectiveness and safety of Jiawei Xiaoyao pill(加味逍遥丸,JXP)in the treatment of symptoms associated with premenstrual syndrome(PMS).METHODS:A total of 144 regularly menstruating women w... OBJECTIVE:To investigate the effectiveness and safety of Jiawei Xiaoyao pill(加味逍遥丸,JXP)in the treatment of symptoms associated with premenstrual syndrome(PMS).METHODS:A total of 144 regularly menstruating women with PMS were recruited at 8 sites in China from August 2017 to December 2018,and randomized to receive either a JXP or a matching placebo(12 g/d,6 g twice a day)for 3 menstrual cycles.The primary indicator was the reduced Daily Record of Severity of Problems(DRSP)scores in the luteal phase after 3 months of treatment.The safety outcomes included clinical adverse events(AEs),adverse reactions(ARs),changes in vital signs,and laboratory tests.RESULTS:JXP surpassed the placebo in reducing DRSP scores(psychological/somatic dysfunction)in the luteal phase over 3 menstrual cycles of treatment(PFAS=0.002,PPPS=0.001).Additionally,there were no significant differences in the incidence of AEs,severe AEs,withdrawal due to AEs and ARs between the two groups(all P>0.05),and no clinically significant adverse medical events related to the test drug observed.CONCLUSIONS:JXP was superior to the placebo in relieving the symptoms associated with PMS,which signified that JXP may be effective,safe,and welltolerated as an alternative therapy. 展开更多
关键词 premenstrual syndrome randomized controlled trial double-blind method Jiawei Xiaoyao pill
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关于降低针灸临床试验主观因素对结局指标影响的方法探讨 被引量:4
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作者 朱可蓥 许卫华 《浙江中医药大学学报》 CAS 2013年第3期332-334,共3页
[目的]探讨在针灸临床试验中降低主观因素的方法,以减少对结局指标的影响。[方法]分析针灸临床试验中可能产生主观因素的环节,对这些环节进行一定控制,减少主观因素产生的可能。[结果]主观因素可以来自于参与针灸试验的受试者及试验实... [目的]探讨在针灸临床试验中降低主观因素的方法,以减少对结局指标的影响。[方法]分析针灸临床试验中可能产生主观因素的环节,对这些环节进行一定控制,减少主观因素产生的可能。[结果]主观因素可以来自于参与针灸试验的受试者及试验实施者等方面。[结论]控制受试者的主观感受,优化试验设计,在试验设计中采取随机、对照、多环节设盲等方法,能够有效地降低来自受试者和试验者两方面的主观因素对结局指标的影响。 展开更多
关键词 针灸 干预措施 临床试验 主观影响 随机对照 盲法
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Efficacy of Huadananshen mistura on insomnia: a randomized, double-blind, placebo-controlled, and multi-center clinical trial 被引量:4
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作者 Huafang Li Xiaoli Yan +3 位作者 Ting Li Jian Xu Qiaochu Wang Yifeng Xu 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2013年第4期423-427,共5页
OBJECTIVE: To evaluate the effect of Huadananshen mistura in clinical treatment of Chinese patients with insomnia. METHODS: In this randomized, double-blind, placebo-controlled, multi-center study, 244 patients with i... OBJECTIVE: To evaluate the effect of Huadananshen mistura in clinical treatment of Chinese patients with insomnia. METHODS: In this randomized, double-blind, placebo-controlled, multi-center study, 244 patients with insomnia were randomly assigned to a placebo group, a low-dose (10 mL/day), or a high-dose (20 mL/day) mistura group. Efficacy was assessed by using the sleep dysfunction rating scale (SDRS) and Clinical Global Impression-Improvement (CGI-I) scores. Safety and tolerability assessments included emergent adverse events, laboratory tests, and electrocardiograms. RESULTS: Total SDRS scores decreased in all three groups, and there were significant differences between the placebo group and the lowand high-dose mistura groups (P=0.000). CGI-I ratings in the lowand high-dose mistura groups were sig-nificantly better than that of the placebo group (P= 0.000). Incidences of rebound insomnia were similar in all three groups (placebo group: 6.94% , low-dose mistura group: 12.99% , and high-dose mistura group: 10.96% ; P=0.475). The efficacy of Huadananshen mistura in the lowor high-dose group was significantly better than that of the placebo group (P=0.000), but with no significant difference found between the lowand high-dose mistura groups (P=0.887). The rates of adverse events were similar in the three groups (placebo 2.44% , low-dose mistura 0%, and high-dose mistura 5%; P=0.088). CONCLUSION: Huadananshen mistura is an effective and generally well-tolerated hypnotic medicine for the treatment of Chinese patients with insomnia. 展开更多
关键词 Sleep initiation and maintenance disorders Medicine Chinese traditional randomized controlled trials Double-blind method Huadananshen mistura
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Randomized MILP framework for Securing Virtual Machines from Malware Attacks
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作者 R.Mangalagowri Revathi Venkataraman 《Intelligent Automation & Soft Computing》 SCIE 2023年第2期1565-1580,共16页
Cloud computing involves remote server deployments with public net-work infrastructures that allow clients to access computational resources.Virtual Machines(VMs)are supplied on requests and launched without interacti... Cloud computing involves remote server deployments with public net-work infrastructures that allow clients to access computational resources.Virtual Machines(VMs)are supplied on requests and launched without interactions from service providers.Intruders can target these servers and establish malicious con-nections on VMs for carrying out attacks on other clustered VMs.The existing system has issues with execution time and false-positive rates.Hence,the overall system performance is degraded considerably.The proposed approach is designed to eliminate Cross-VM side attacks and VM escape and hide the server’s position so that the opponent cannot track the target server beyond a certain point.Every request is passed from source to destination via one broadcast domain to confuse the opponent and avoid them from tracking the server’s position.Allocation of SECURITY Resources accepts a safety game in a simple format as input andfinds the best coverage vector for the opponent using a Stackelberg Equilibrium(SSE)technique.A Mixed Integer Linear Programming(MILP)framework is used in the algorithm.The VM challenge is reduced by afirewall-based controlling mechanism combining behavior-based detection and signature-based virus detection.The pro-posed method is focused on detecting malware attacks effectively and providing better security for the VMs.Finally,the experimental results indicate that the pro-posed security method is efficient.It consumes minimum execution time,better false positive rate,accuracy,and memory usage than the conventional approach. 展开更多
关键词 Virtualization technology security cross-VM channel attack VM-escape R-VM-MILP algorithm(randomized VM allocation of security resources) Mixed Integer Linear Programming(MILP) SSE strategy firewall-based monitoring method
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图的最大二等分问题的低秩可行方向算法 被引量:3
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作者 穆学文 刘红卫 刘三阳 《系统科学与数学》 CSCD 北大核心 2007年第5期780-790,共11页
基于图的最大二等分问题的半定规划松弛模型,利用矩阵的低秩分解技巧,给出了该问题的半定规划松弛的一种低秩可行方向算法.在一定的条件下,证明了算法的收敛性.结合0.699随机扰动方法得到原问题的近似最优解.数值实验表明该方法能有效... 基于图的最大二等分问题的半定规划松弛模型,利用矩阵的低秩分解技巧,给出了该问题的半定规划松弛的一种低秩可行方向算法.在一定的条件下,证明了算法的收敛性.结合0.699随机扰动方法得到原问题的近似最优解.数值实验表明该方法能有效地求解图的最大二等分问题. 展开更多
关键词 图的最大二等分问题 半定规划松弛 可行方向算法 随机扰动
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On Unknown Small Subsets and Implicit Measures: New Techniques for Parameterized Algorithms 被引量:1
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作者 陈建二 冯启龙 《Journal of Computer Science & Technology》 SCIE EI CSCD 2014年第5期870-878,共9页
Parameterized computation is a recently proposed alternative approach to dealing with NP-hard problems.Developing efficient parameterized algorithms has become a very active research area in the current research in th... Parameterized computation is a recently proposed alternative approach to dealing with NP-hard problems.Developing efficient parameterized algorithms has become a very active research area in the current research in theoretical computer science. In this paper, we investigate a number of new algorithmic techniques that were proposed and initiated by ourselves in our research in parameterized computation. The techniques have proved to be very useful and promising,and have led to improved parameterized algorithms for many well-known NP-hard problems. 展开更多
关键词 parameterized computation randomized method implicit branching
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随机响应机制效用优化研究 被引量:2
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作者 周异辉 鲁来凤 吴振强 《通信学报》 EI CSCD 北大核心 2019年第6期74-81,共8页
针对本地化差分隐私中的隐私-效用均衡问题,对差分隐私和近似差分隐私情形下的二元广义随机响应机制建立效用优化模型,并采用图解法、最优性证明、软件求解和极值点等方法求解,得到了效用最优值与隐私预算、输入数据分布的精确表达式,... 针对本地化差分隐私中的隐私-效用均衡问题,对差分隐私和近似差分隐私情形下的二元广义随机响应机制建立效用优化模型,并采用图解法、最优性证明、软件求解和极值点等方法求解,得到了效用最优值与隐私预算、输入数据分布的精确表达式,给出了相应的效用最优机制。研究结果表明效用最优值和效用最优机制均与隐私预算和输入数据分布相关。另外,多元随机响应机制效用优化模型可通过本地化差分隐私极值点来求解。 展开更多
关键词 本地化差分隐私 随机响应 效用优化 极值点 单纯形法
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Simmons模型的贝叶斯观点 被引量:2
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作者 吕端会 傅珏生 《苏州大学学报(自然科学版)》 CAS 2009年第1期11-15,共5页
针对属性特征的敏感性问题的Simmons模型引进贝叶斯观点,讨论了已知无关问题的概率在取什么值时,在Simmons模型下可以得到敏感性问题的估计.由于敏感性问题的未知性,用分层的方法提高精度.最后给出了一种任给一个无关问题的概率而得到... 针对属性特征的敏感性问题的Simmons模型引进贝叶斯观点,讨论了已知无关问题的概率在取什么值时,在Simmons模型下可以得到敏感性问题的估计.由于敏感性问题的未知性,用分层的方法提高精度.最后给出了一种任给一个无关问题的概率而得到精确估计的方法. 展开更多
关键词 敏感性问题 Simmons模型 贝叶斯方法 最大似然估计 分层抽样
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关于秩和检验的一点讨论 被引量:2
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作者 孙国强 冯长焕 《太原师范学院学报(自然科学版)》 2013年第2期9-12,共4页
首先引入U统计量与秩和统计量的线性关系,并对Wilcoxon两样本秩和检验临界值的确定进行说明,然后介绍了处理样本中结的两种方法,并对随机化法在运用中可能出现的问题进行讨论,目的在于能够指导实际运用.
关键词 U统计量 Wilcoxon秩和检验 随机化法
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宽带网中基于随机策略的QoS路由算法
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作者 王建新 陈松乔 陈建二 《计算机工程》 CAS CSCD 北大核心 2001年第10期26-28,共3页
:主要研究在网络节点和链路上均有限制条件的网络模型,并提出了一种多限制条件下的QoS路由算法。在该算法中,文章采用了预先处理链路信息和随机策略等新的方法。该算法具有良好的性能,并能够有效解决多限制条件下的QoS路由问题。
关键词 宽带网 随机策略 服务质量 路由算法 计算机网络
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Shexian Bupleurum Alleviates Insomnia and Improves Symptoms of Anxiety and Depression:A Randomized Double-Blind Placebo-Controlled Clinical Trial
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作者 Kai Zhang Xianling Zheng +4 位作者 Hongfeng Zhang Xueqiang Zhang Yanmin Xu Shiying Jin Shuang Huo 《Journal of Clinical and Nursing Research》 2022年第4期1-11,共11页
Objective:To observe the clinical efficacy of Shexian bupleurum on insomnia based on evaluation scales and polysomnogram(PSG).Methods:A total of 260 patients suffering from insomnia admitted to the outpatient departme... Objective:To observe the clinical efficacy of Shexian bupleurum on insomnia based on evaluation scales and polysomnogram(PSG).Methods:A total of 260 patients suffering from insomnia admitted to the outpatient department of Handan Central Hospital were included in a randomized,double blind,placebo-controlled trial.The patients were randomly divided into two groups:a control group(receiving placebo,n=150),and an intervention group(receiving Shexian bupleurum treatment,n=110).The clinical trial lasted for 4 weeks.The Pittsburgh Sleep Quality Index(PSQI),Insomnia Severity Index(ISI),Patient Health Questionnaire(PHQ)-9,Generalized Anxiety Disorder(GAD)-7,17 items of Hamilton Depression Scale(HAMD-17),and Hamilton Anxiety Scale(HAMA)were used to evaluate the patients at baseline as well as two weeks and four weeks after treatment;the Treatment Emergent Symptom Scale(TESS)was used to evaluate adverse reactions;polysomnography(PSG)was used to monitor and analyze their sleep characteristics at baseline and four weeks after treatment.Results:The PSQI,ISI,PHQ-9,HAMD-17,and HAMA scores of the intervention group significantly decreased compared to the control group,while the total sleep time,rapid eye movement sleep latency,stage 2 sleep,deep sleep,rapid eye movement sleep,and sleep efficiency of the intervention group significantly increased compared to the control group.The PHQ-9 score of the control group only decreased two weeks after treatment(p<0.05)compared to the intervention group.In addition,there were no obvious adverse events in both the intervention group and the control group.Conclusion:Shexian bupleurum not only improves sleep quality,but also relieves depression and anxiety in patients who suffer from insomnia. 展开更多
关键词 Clinical trial randomized double-blind method INSOMNIA Shexian bupleurum POLYSOMNOGRAPHY
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水面无人艇冗余路径点约减方法研究——基于最优路径代价估计 被引量:1
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作者 温乃峰 刘冠群 +1 位作者 于海洋 张汝波 《大连民族大学学报》 2017年第5期461-465,共5页
针对复杂海洋环境下USV在线路径规划问题,提出一种顺序-随机两模式的冗余路径点约减方法。利用估计通过路径点的最优路径来制定其被约减的概率,并通过概率值的自适应变化考虑更多路径点的组合方案。采用顺序方法控制随机约减范围,快速... 针对复杂海洋环境下USV在线路径规划问题,提出一种顺序-随机两模式的冗余路径点约减方法。利用估计通过路径点的最优路径来制定其被约减的概率,并通过概率值的自适应变化考虑更多路径点的组合方案。采用顺序方法控制随机约减范围,快速发现潜在的优化路径。在约减过程中考虑海流等复杂海况对USV运动的影响,从而降低USV的碰撞概率。实验结果表明,本文方法可有效地简化并优化USV路径。 展开更多
关键词 水面无人艇 路径简化 冗余路径点约减 海流信息处理 随机化方法
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带预处理的半定规划多用户检测器 被引量:1
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作者 穆学文 刘三阳 张亚玲 《西安电子科技大学学报》 EI CAS CSCD 北大核心 2006年第1期89-92,共4页
基于多用户检测问题的二次整数规划模型,提出了一种带预处理的半定规划多用户检测方法.该方法利用预处理方法把多用户检测问题的模型等价为一个规模较小的二次整数规划模型,给出简化模型的半定规划松弛,结合随机扰动方法得到多用户检测... 基于多用户检测问题的二次整数规划模型,提出了一种带预处理的半定规划多用户检测方法.该方法利用预处理方法把多用户检测问题的模型等价为一个规模较小的二次整数规划模型,给出简化模型的半定规划松弛,结合随机扰动方法得到多用户检测问题的次优解.这种方法改善了用户多时半定规划方法误码率高的状况,同时也缩短了直接利用半定规划方法的检测时间. 展开更多
关键词 多用户检测 半定规划松弛 二次整数规划 随机扰动方法 误码率
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连续型利率期限结构的随机化方法
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作者 陈耀辉 胡洁 《长江大学学报(社会科学版)》 2003年第5期1-4,共4页
在三个假设的前提下,用随机化方法得到了连续型利率期限结构模型,并给出了模型的解及解的经济学解释。
关键词 利率 期限结构 随机化方法
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