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Leach： an automatic learning cache for inline primary deduplication system

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Frontiers of Computer Science 2014年第2期8卷 175-183页

作者： bin liN Shanshan li xiangke liAO Jing ZHANG Xiaodong liU School of Computer National University of Defense Technology Changsha 410073 China

Deduplication technology has been increasingly used to reduce storage costs. Though it has been successfully applied to backup and archival systems, existing techniques can hardly be deployed in primary storage systems due to the associated latency cost of detecting duplicated data, where every unit has to be checked against a substantially large fin- gerprint index before it is written. In this paper we introduce Leach, for inline primary storage, a self-learning in-memory fingerprints cache to reduce the writing cost in deduplica- tion system. Leach is motivated by the characteristics of real- world I/O workloads： highly data skew exist in the access patterns of duplicated data. Leach adopts a splay tree to or- ganize the on-disk fingerprint index, automatically learns the access patterns and maintains hot working sets in cache mem- ory, with a goal to service a majority of duplicated data de- tection. Leveraging the working set property, Leach provides optimization to reduce the cost of splay operations on the fin- gerprint index and cache updates. In comprehensive experi- ments on several real-world datasets, Leach outperforms con- ventional LRU （least recently used） cache policy by reducing the number of cache misses, and significantly improves write performance without great impact to cache hits.

关键词： deduplication duplicate detection splay tree,cache

Vibration suppression of a large flexible spacecraft for on-orbit operation

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Science China(Information Sciences) 2017年第5期60卷 36-50页

作者： Deshan MENG Houde liU Yanan li Wenfu XU bin liANG Shenzhen Graduate School Harbin Institute of Technology Department of Mechanical and Aerospace Engineering The Ohio State University Shenzhen Key Lab of Space Robotic Technology and Telescience Shenzhen Graduate SchoolTsinghua University

Flexible appendages, such as solar panels, communication antennas and other large structures, are mounted on the base of a space robot and target satellite. The vibration of the flexible structure is excited by operations of a space manipulator. It is very challenging to control the vibration of large flexible appendages for on-orbit operation and, especially when the manipulator operates a non-cooperative target with unknown structural parameters and vibration information. In this study, a hybrid control method is proposed based on wave-based control and PD control methods to control the motion of a manipulator while suppressing the vibration of appendages. First, the rigid-flexible coupled dynamic model of a compounded system is *** is followed by designing a hybrid control strategy combining wave-based control and PD control for restto-rest maneuvers based on the characteristics of the compounded system. Finally, the simulation of a 3D compounded system is provided to verify the effectiveness of the presented approach. The simulation results indicate that the space robot can successfully berth the target while suppressing the vibrations of the structure.

关键词： space robot large flexible spacecraft vibration suppression wave-based control on-orbit operation

鼠神经生长因子联合低剂量重组人促红细胞生成素对早产儿脑损伤后神经发育的影响

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中国合理用药探索 2024年第4期21卷 63-68页

作者：吴珺珺吴斌文艺田丽周口市中心医院儿童保健科周口466000 河南省中西医结合医院儿科郑州450000

目的:探讨鼠神经生长因子(mNGF)联合低剂量重组人促红细胞生成素(rh Epo)对早产儿脑损伤后神经发育的影响。方法:选取2021年3月~2022年3月期间某院收治的200例脑损伤早产儿作为研究对象,依据随机数字表法分为对照组和观察组,每组100例... 详细信息

目的:探讨鼠神经生长因子(mNGF)联合低剂量重组人促红细胞生成素(rh Epo)对早产儿脑损伤后神经发育的影响。方法:选取2021年3月~2022年3月期间某院收治的200例脑损伤早产儿作为研究对象,依据随机数字表法分为对照组和观察组,每组100例。两组患儿均给予营养支持、水电解质纠正、血糖、血压维持等常规治疗,对照组在常规治疗基础上给予注射用鼠神经生长因子,观察组在对照组治疗基础上静脉注射低剂量重组人促红素注射液(CHO细胞)。比较两组患儿脑损伤相关因子[神经元特异性烯醇化酶(NSE)、S100钙结合蛋白β(S100β)、8-羟基脱氧鸟苷(8-OHdG)、8-异前列腺素F2α(8-iso-PGF2α)]、炎症因子[肿瘤坏死因子-α(TNF-α)、白介素-18(IL-18)、Toll样受体4(TLR4)]水平、神经发育异常情况、智能等级及不良反应发生情况。结果:治疗后,两组患儿NSE、S100β、8-OHdG、8-iso-PGF2α水平均降低(P0.05)。结论:在常规治疗基础上联用m NGF、低剂量rhEpo可有效降低患儿脑损伤相关因子水平及神经发育异常率,提高智能等级,且未增加不良反应的发生风险。

关键词：早产儿脑损伤神经发育鼠神经生长因子重组人促红细胞生成素脑损伤相关因子智能等级安全性

Locomotion Performance of the Amphibious Robot on Various Terrains and Underwater with Flexible Flipper Legs

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Journal of Bionic Engineering 2016年第4期13卷 525-536页

作者： bin Zhong Youcheng Zhou Xiaoxiang li Min Xu Shiwu Zhang Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei 230026 China

Amphibious robots are attracting more and more attentions from researchers worldwide tbr their broad appllcanons m resource exploration, disaster rescue, and reconnaissance. Amphibious robot with transformable flipper-leg composite propul- sion mechanisms can adapt various terrestrial and water environments. In this paper, we explored the locomotion performance of a amphibious robot with flexible flipper legs on various terrains and underwater through dynamical simulation. The influence of the stiffness of the flipper legs on the locomotion performance in various environments was investigated comprehensively. The results indicate that the locomotion with flexible flipper legs is very stable, and the stiffness of the flipper legs has a great impact on the locomotion performance. The verification experiments demonstrate the accuracy of the simulation results. The study facilitates the design of the amphibious robot and indicates that the passively transformable flipper-leg mechanisms also enable amphibious robot to conquer various complex terrestrial environments.

关键词： amphibious robots flexible flipper legs various terrains locomotion performance

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刺梨叶茶的品质分析及功能研究

中国酿造 2024年第6期43卷 225-232页

作者：穆先涂青陈秋慧卢红梅杨双全陈莉贵州大学酿酒与食品工程学院贵州省发酵工程与生物制药重点实验室贵州贵阳550025 贵州大学化学与化工学院贵州贵阳550025 不详

以刺梨树春季嫩叶为原料,采用3种传统工艺分别制备得到刺梨叶绿茶、红茶、白茶,并对其进行品质分析及功能研究。采用感官评价结合模糊数学评价,通过层次分析(AHP)法确定多酚、黄酮、感官评分权重,计算刺梨叶茶的综合评分,并对刺梨叶茶... 详细信息

以刺梨树春季嫩叶为原料,采用3种传统工艺分别制备得到刺梨叶绿茶、红茶、白茶,并对其进行品质分析及功能研究。采用感官评价结合模糊数学评价,通过层次分析(AHP)法确定多酚、黄酮、感官评分权重,计算刺梨叶茶的综合评分,并对刺梨叶茶的抗氧化能力和体外降血糖能力进行分析。结果表明,3种刺梨叶茶的综合评价为刺梨叶绿茶(19.26)>刺梨叶白茶(16.96)>刺梨叶红茶(12.57)。以市售荷叶茶为对照,抗氧化能力的测试中,3种刺梨叶茶及荷叶茶的1,1-二苯基-2-三硝基苯肼(DPPH)、2,2’-联氮-双(3-乙基苯并噻唑啉-6-磺酸)(ABTS)、羟基自由基清除率及铁还原能力分别为刺梨叶绿茶89.84%、97.96%、76.24%、0.910;刺梨叶红茶87.35%、67.63%、62.32%、0.573;刺梨叶白茶83.60%、75.89%、60.05%、0.531;荷叶茶66.94%、56.31%、98.35%、0.180。降血糖功能研究中,3种刺梨叶茶及荷叶茶的α-葡萄糖苷酶、α-淀粉酶活性抑制率分别为刺梨叶绿茶96.57%、21.75%;刺梨叶红茶89.90%、23.11%;刺梨叶白茶92.52%、22.97%;荷叶茶92.05%、18.82%。综上,3种刺梨叶茶的相关指标基本都优于市售荷叶茶,表明其具有较好的抗氧化能力和降血糖能力,其中刺梨叶绿茶的效果最好。

关键词：刺梨叶茶层次分析法品质分析抗氧化能力降血糖能力

Application and efficacy of reconstructing forked corpus spongiosum in distal/midshaft hypospadias repair

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Asian Journal of Andrology 2021年第1期23卷 47-51页

作者： bin Zhang Yun-li Bi Shuang-Sui Ruan Department of Pediatric Urology Children's Hospital of Fudan UniversityShanghai 201102China

We reviewed our experience in reconstructing forked corpus spongiosum(FCS)in distal/midshaft hypospadias repair and analyzed the efficacy of this surgical *** August 2013 to December 2018,137 consecutive cases of distal/midshaft hypospadias operated by the same surgeon in Urology Department,Children’s Hospital of Fudan University(Shanghai,China),were retrospectively ***-four patients who underwent routine tubularized incised plate(TIP)or onlay island flap(ONLAY)surgery were included in the nonreconstructing group,and 73 patients who underwent reconstructing FCS during TIP or ONLAY surgery were included as the reconstructing ***-eight cases underwent TIP,and 26 underwent ONLAY in the nonreconstructing group,with a median follow-up of 44(range:30-70)***-seven cases underwent TIP,and 46 underwent ONLAY in the reconstructing group,with a median follow-up of 15(range:6-27)*** the nonreconstructing/reconstructing groups,the mean age at the time of surgery was 37.55(standard deviation[s.d.]:29.65)/35.23(s.d.:31.27)months,the mean operation duration was 91.95(s.d.:12.17)/93.84(s.d.:14.91)min,the mean neourethral length was 1.88(s.d.:0.53)/1.94(s.d.:0.53)cm,and the mean glans width was 11.83(s.d.:1.32)/11.56(s.d.:1.83)***(18.8%)/5(6.8%)postoperative complications occurred in the nonreconstructing/reconstructing *** included fistula(5/2),glans dehiscence(3/0),diverticulum(1/2),residual chordee(3/0),and meatus stenosis(0/1)in each *** was a significant difference in the overall rate of complications(P=0.035).These results indicate that the technique of reconstructing FCS provides excellent outcomes with fewer complications in distal/midshaft hypospadias repair.

关键词： complications distal/midshaft hypospadias forked corpus spongiosum glans tilt

Model tests on interaction between soil and geosynthetics subjected to localized subsidence in landfills

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第6期13卷 433-444页

作者： bin ZHU Deng GAO Jun-chao li Yun-min CHEN MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Department of Civil EngineeringZhejiang UniversityHangzhou 310058China

In a landfill, excessive tensile strains or failure of the liner system due to localized subsidence underneath the geosynthetic liner, is a concern in design and operation of the landfill. The localized subsidence can be commonly withstood by reinforcements such as geogrids. A total of nine model tests were carried out to study the influence of soil arching in overburden sandy soil on the geosynthetics and the interaction between the soil and the geosynthetics. The localized subsidence was modeled by a strip trapdoor under the geosynthetic reinforcements. The reinforcement includes several layers of polyvinylchlorid （PVC） membrane or both PVC membrane and a compacted clay layer. Test results show that the vertical soil pressure acting on the geosynthetics within the subsidence zone is strongly related to the deflection of the geosynthefics. The soil pressure acting on the deflected geosynthetics will decrease to a minimum value with respect to its deflection if the final deflection is large enough, and this minimum value is almost independent of the overburden height. Otherwise, the deflection of geosynthetics cannot result in a full degree of soil arching, and the soil pressure within the subsidence zone increases with the increase of overburden height. Deflections and strains of the geosynthetics obviously decrease with the increase of their tensile stiffness. The presence of a compacted clay layer buffer can therefore reduce both deflections and strains of the geosynthetics. Finally, a composite liner structure is recommended for landfills to withstand the localized subsidences.

关键词： Landfill Soil arching Trapdoor Model test Geosynthetics

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烹饪熟度对牛排挥发性风味物质的影响研究

中国调味品 2024年第9期49卷 47-53页

作者：姚力为邓静易宇文刘阳朱开宪吴华昌成都大学食品与生物工程学院成都610106 四川旅游学院烹饪科学四川省高等学校重点实验室成都610100

为探究烹饪熟度对牛排挥发性化合物的影响,文章采用感官分析、电子鼻和GC-IMS分析不同烹饪熟度(生肉、一分熟、三分熟、五分熟、七分熟和九分熟)牛排中挥发性化合物的差异。感官结果表明,随着烹饪熟度的增加,牛排在嫩度、多汁性和外观... 详细信息

为探究烹饪熟度对牛排挥发性化合物的影响,文章采用感官分析、电子鼻和GC-IMS分析不同烹饪熟度(生肉、一分熟、三分熟、五分熟、七分熟和九分熟)牛排中挥发性化合物的差异。感官结果表明,随着烹饪熟度的增加,牛排在嫩度、多汁性和外观上的分数先升高后降低,而在整体风味和整体接受度上其值一直增加,当牛排熟度为九分熟时,整体感官最佳;电子鼻结果表明,样品在T、P传感器上具有较高的值,并且随着烹饪熟度的增加,传感器上的值也在不断增加,说明烹饪熟度会增加样品中挥发性化合物的浓度;GC-IMS结果表明,在样品中共鉴定出88种挥发性化合物,主要是醇类、醛类、酮类和酯类,并且随着熟度的增加,样品中化合物的浓度增加,通过ROAV共计算出12种特征性风味物质(ROAV>1),对样品整体风味具有较高的贡献作用,并且1-辛烯-3-酮的贡献作用最突出;通过Pearson相关性发现,异戊醇(单体、二聚体)、正己醇(单体、二聚体)和2-乙基-3-甲基吡嗪与传感器T、P具有较高的相关性。文章着重分析了不同熟度下牛排挥发性风味物质的变化,为西餐牛排煎制的烹饪工艺优化和品质控制提供了参考依据。

关键词：烹饪熟度牛排挥发性风味物质电子鼻 GC-IMS

Controlling the key by choosing the detection bits in quantum cryptographic protocols

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Science China(Information Sciences) 2015年第11期58卷 200-210页

作者： liU bin GAO Fei HUANG Wei li Dan WEN QiaoYan State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications College of Computer Science Chongqing University

Eavesdropping detection is an indispensable process of most quantum cryptographic protocols. By publishing and comparing part of the shared bits, called as detection bits, the participants can check whether there exists an eavesdropper. Generally, the detection bits are chosen randomly. Consequently, the secret bits, i.e., the rest bits, are also random. Then, what if the detection bits are chosen non-randomly? Can the participant who chooses the detection bits make the secret bits to be a predetermined string he expected?This paper focuses on the participants’ key control capability when they choose the detection bits selectively in two-party quantum communication protocols. Concretely, we analyze the participants’ key control capability in different situations of different proportions of the detection bits. And we prove that the participants can predetermine, with high probability, any part of the secret bits of which the length is smaller than that of the detection bits. The above result has various potential applications in quantum cryptographic ***, utilizing this non-random selection of the detection bits, one can realize the function of a deterministic quantum key distribution protocol through a random one if the number of the detection bits is not smaller than that of the secret bits. What is more, we find that quite a few quantum key agreement protocols cannot guarantee the fairness of the key in the sense that the participant who chooses the detection bits can control the key somewhat.

关键词： eavesdropping detection deterministic quantum key distribution quantum key agreement quantum information quantum cryptography