单站点传送带给料加工站(Conveyor-serviced production station,CSPS)系统中,可运用强化学习对状态–行动空间进行有效探索,以搜索近似最优的前视距离控制策略.但是多站点CSPS系统的协同控制问题中,系统状态空间的大小会随着站点个数...单站点传送带给料加工站(Conveyor-serviced production station,CSPS)系统中,可运用强化学习对状态–行动空间进行有效探索,以搜索近似最优的前视距离控制策略.但是多站点CSPS系统的协同控制问题中,系统状态空间的大小会随着站点个数的增加和缓存库容量的增加而成指数形式(或几何级数)增长,从而导致维数灾,影响学习算法的收敛速度和优化效果.为此,本文在站点局域信息交互机制的基础上引入状态聚类的方法,以减小每个站点学习空间的大小和复杂性.首先,将多个站点看作相对独立的学习主体,且各自仅考虑邻近下游站点的缓存库的状态并纳入其性能值学习过程;其次,将原状态空间划分成多个不相交的子集,每个子集用一个抽象状态表示,然后,建立基于状态聚类的多站点反馈式Q学习算法.通过该方法,可在抽象状态空间上对各站点的前视距离策略进行优化学习,以寻求整个系统的生产率最大.仿真实验结果说明,与一般的多站点反馈式Q学习方法相比,基于状态聚类的多站点反馈式Q学习方法不仅具有收敛速度快的优点,而且还在一定程度上提高了系统生产率.展开更多
The calculation method about infrared multi-sites passive system location is introduced based on the principle of the weighted least square method, and the variance matrix of estimated error is offered. Through deduct...The calculation method about infrared multi-sites passive system location is introduced based on the principle of the weighted least square method, and the variance matrix of estimated error is offered. Through deduction, it can be found out that treated appraise precision can be directly analyzed and deduced without carrying out real measure and reaching estimation value. The simulation result shows that the system performance based on the weighted least square method is much better than the traditional passive location method, and it can be also used for reference to the research of the location algorithm of similar system.展开更多
Hypersaline environments are colonized by communities of microorganisms, which developed adaptations from halotolerant to extreme halophilic lifestyles. Twenty-four halophilic archaeal strains were isolated from three...Hypersaline environments are colonized by communities of microorganisms, which developed adaptations from halotolerant to extreme halophilic lifestyles. Twenty-four halophilic archaeal strains were isolated from three Algerian hypersaline sites, including the solar salterns in Ichekaben and two natural salt lakes at Ouargla and Oran. Almost full-length 16S rRNA genes were amplified using archaeal-specific primers, sequenced and phylogenetically analyzed. Three isolates from the salt lake of Ouargla were affiliated to Halorubrum sp., while six isolates from Ichekaben were Natrinema sp.. The remaining strains belonged to the genus Haloarcula, which was identified in the three Algerian sites. A phylogenetic tree of Haloarcula sp. including the two copies of the 16S rRNA gene, showed that two strains group with Haloarcula hispanica, while the other 13 cluster with OHF-1/OHF-2 isolated from French commercial salt. Both Natrinema sp. and Haloarcula sp. were persistent at Ichekaben. For the six Natrinema sp. isolates, this observation correlates with their capacity to produce antimicrobial compounds, and a DNA fragment closely related to the halocin C8 gene was amplified for five strains.展开更多
Objective： To describe two cases of bilateral transumbilical laparoendoscopic single-site（LESS） surgeries in a single operative session and assess the safety, feasibility and efficacy. Methods： One patient underwe...Objective： To describe two cases of bilateral transumbilical laparoendoscopic single-site（LESS） surgeries in a single operative session and assess the safety, feasibility and efficacy. Methods： One patient underwent right ureterolithotomy and left varicocelectomy, and the patient was performed with right simple nephrectomy for nonfunctioning kidney due to ureteral calculus and left ureterolithotomy using a novel multichannel TriPortTM via a single 2-3 cm transumbilical incision Results： The right-side ureterolithotomy and left-side varicocelectomy were finished in 229 minutes, with a total estimated blood loss of 50 hal. The right-side simple nephrectomy and left-side ureterolithotomy in the other patient were finished in 340 minutes, with a total estimated blood loss of 100 ml. There were no major complications. At the latest follow-up, both patients remained symptom-free and there were no evidences of recurrence. Both of them were delighted for the single scarConclusion： Synchronous LESS urologic procedure via a single umbilical incision is technically feasible, safe and efficacious with a promising potential展开更多
文摘单站点传送带给料加工站(Conveyor-serviced production station,CSPS)系统中,可运用强化学习对状态–行动空间进行有效探索,以搜索近似最优的前视距离控制策略.但是多站点CSPS系统的协同控制问题中,系统状态空间的大小会随着站点个数的增加和缓存库容量的增加而成指数形式(或几何级数)增长,从而导致维数灾,影响学习算法的收敛速度和优化效果.为此,本文在站点局域信息交互机制的基础上引入状态聚类的方法,以减小每个站点学习空间的大小和复杂性.首先,将多个站点看作相对独立的学习主体,且各自仅考虑邻近下游站点的缓存库的状态并纳入其性能值学习过程;其次,将原状态空间划分成多个不相交的子集,每个子集用一个抽象状态表示,然后,建立基于状态聚类的多站点反馈式Q学习算法.通过该方法,可在抽象状态空间上对各站点的前视距离策略进行优化学习,以寻求整个系统的生产率最大.仿真实验结果说明,与一般的多站点反馈式Q学习方法相比,基于状态聚类的多站点反馈式Q学习方法不仅具有收敛速度快的优点,而且还在一定程度上提高了系统生产率.
基金Supported by the Research Fund for the Department of Science and Technology of Xi'an (No.GG9907)
文摘The calculation method about infrared multi-sites passive system location is introduced based on the principle of the weighted least square method, and the variance matrix of estimated error is offered. Through deduction, it can be found out that treated appraise precision can be directly analyzed and deduced without carrying out real measure and reaching estimation value. The simulation result shows that the system performance based on the weighted least square method is much better than the traditional passive location method, and it can be also used for reference to the research of the location algorithm of similar system.
文摘Hypersaline environments are colonized by communities of microorganisms, which developed adaptations from halotolerant to extreme halophilic lifestyles. Twenty-four halophilic archaeal strains were isolated from three Algerian hypersaline sites, including the solar salterns in Ichekaben and two natural salt lakes at Ouargla and Oran. Almost full-length 16S rRNA genes were amplified using archaeal-specific primers, sequenced and phylogenetically analyzed. Three isolates from the salt lake of Ouargla were affiliated to Halorubrum sp., while six isolates from Ichekaben were Natrinema sp.. The remaining strains belonged to the genus Haloarcula, which was identified in the three Algerian sites. A phylogenetic tree of Haloarcula sp. including the two copies of the 16S rRNA gene, showed that two strains group with Haloarcula hispanica, while the other 13 cluster with OHF-1/OHF-2 isolated from French commercial salt. Both Natrinema sp. and Haloarcula sp. were persistent at Ichekaben. For the six Natrinema sp. isolates, this observation correlates with their capacity to produce antimicrobial compounds, and a DNA fragment closely related to the halocin C8 gene was amplified for five strains.
基金Supported by the Municipal Hospitals' Project for Emerging and Frontier Technology of Shanghai(NO.SHDC12010115)Project for the Key Discipline of Shanghai
文摘Objective： To describe two cases of bilateral transumbilical laparoendoscopic single-site（LESS） surgeries in a single operative session and assess the safety, feasibility and efficacy. Methods： One patient underwent right ureterolithotomy and left varicocelectomy, and the patient was performed with right simple nephrectomy for nonfunctioning kidney due to ureteral calculus and left ureterolithotomy using a novel multichannel TriPortTM via a single 2-3 cm transumbilical incision Results： The right-side ureterolithotomy and left-side varicocelectomy were finished in 229 minutes, with a total estimated blood loss of 50 hal. The right-side simple nephrectomy and left-side ureterolithotomy in the other patient were finished in 340 minutes, with a total estimated blood loss of 100 ml. There were no major complications. At the latest follow-up, both patients remained symptom-free and there were no evidences of recurrence. Both of them were delighted for the single scarConclusion： Synchronous LESS urologic procedure via a single umbilical incision is technically feasible, safe and efficacious with a promising potential
