基于多源异构数据融合的移动群智感知任务推荐算法

现有的移动群智感知任务推荐方法主要包括基于时空信息和社交关系两大类,分别受到时空信息时变性和数据稀疏性问题的限制。为了突破上述限制并综合多源工人行为数据对任务推荐准确度的影响,本文提出了一种基于多源异构数据融合的移动群智感知任务推荐算法。该算法综合考虑了工人地理位置、时间可用性以及社交网络关系等多方面的因素,利用隐语义模型、双向长短时记忆网络模型分别生成空间、时间维度的工人–任务匹配度矩阵实现对工人偏好时空变化的挖掘,并利用Node2Vec图嵌入模型生成社交维度的工人–任务匹配度矩阵,缓解数据稀疏性问题。最后利用BP神经网络将上述三个矩阵进行融合以实现工人行为的多源异构数据融合,并最终进行任务推荐。实验结果表明,本文方法比单一数据源的任务推荐方法具有更好的推荐准确度。

Clinical characteristics of flares in patients with rheumatoid arthritis after total hip and total knee arthroplasty

To the Editor:Introduction of conventional synthetic disease-modifying antirheumatic drugs(csDMARDs)has been highly efficacious in reducing the signs and symptoms of rheumatoid arthritis(RA)and in delaying or preventing structural joint damage.Furthermore,the development and clinical use of biological DMARDs(bDMARDs)and targeted synthetic DMARDs(tsDMARDs)have dramatically altered the prognosis of patients with RA,particularly when they are combined with a treat-to-target regimen(T2T).[1]Consequently,over the last two decades,the rates of total hip arthroplasty(THA)and total knee arthroplasty(TKA)remained stable or even decreased in these special patient populations.Nevertheless,compared to patients with osteoarthritis,patients with RA have a higher risk of having worse functional outcomes and higher rates of complications after arthroplasty.This may be attributed to the complexity of the rheumatic disease process,including high disease activity,comorbidities,and immunosuppressive medications.[2]A key to making perioperative medication management decisions is to balance the risk of periprosthetic infection with the risk of a disease flare.

Hierarchical macro-microporous WPU-ECM scaffolds combined with Microfracture Promote in Situ Articular Cartilage Regeneration in Rabbits

Tissue engineering provides a promising avenue for treating cartilage defects.However,great challenges remain in the development of structurally and functionally optimized scaffolds for cartilage repair and regeneration.In this study,decellularized cartilage extracellular matrix(ECM)and waterborne polyurethane(WPU)were employed to construct WPU and WPU-ECM scaffolds by water-based 3D printing using low-temperature deposition manufacturing(LDM)system,which combines rapid deposition manufacturing with phase separation techniques.The scaffolds successfully achieved hierarchical macro-microporous structures.After adding ECM,WPU scaffolds were markedly optimized in terms of porosity,hydrophilia and bioactive components.Moreover,the optimized WPU-ECM scaffolds were found to be more suitable for cell distribution,adhesion,and proliferation than the WPU scaffolds.Most importantly,the WPU-ECM scaffold could facilitate the production of glycosaminoglycan(GAG)and collagen and the upregulation of cartilage-specific genes.These results indicated that the WPU-ECM scaffold with hierarchical macro-microporous structures could recreate a favorable microenvironment for cell adhesion,proliferation,differentiation,and ECM production.In vivo studies further revealed that the hierarchical macro-microporous WPU-ECM scaffold combined with the microfracture procedure successfully regenerated hyaline cartilage in a rabbit model.Six months after implantation,the repaired cartilage showed a similar histological structure and mechanical performance to that of normal cartilage.In conclusion,the hierarchical macro-microporous WPU-ECM scaffold may be a promising candidate for cartilage tissue engineering applications in the future.

Self-powered macroscopic Brownian motion of spontaneously running liquid metal motors

We disclosed the interiorly driven macroscopic Brownian motion behavior of self-powered liquid metal motors. Such tiny motors in millimeter scale move randomly at a velocity magnitude of centimeters per second in aqueous alkaline solution, well resembling the classical Brownian motion. However, unlike the existing phenomena, where the particle motions were caused by collisions from the surrounding molecules, the current random liquid metal motions are internally enabled and self-powered, along with the colliding among neighboring motors, the substrate and the surrounding electrolyte molecules. Through uniformly dissolving only 1% （mass percentage） A1 into GaInl0, many tiny motors can be quickly fabricated and activated to take the Brownian-like random motions. Further, we introduced an experimental approach of using optical image contrast, which works just like the Wilson cloud chamber, to distinctively indicate the motor trajectory resulted from the generated hydrogen gas stream. A series of unusual complicated multi-phase fluid mechanics phenomena were observed. It was also identified that the main driving factor of the motors comes from the H2 bubbles generated at the bottom of these tiny motors, which is different from the large size self-fueled liquid metal machine. Several typical mechanisms for such unconventional Brownian-like motion phenomena were preliminarily interpreted.

中国人胫骨干相对于胫骨平台的偏心距

背景：带延长杆的胫骨假体已经应用于复杂的初次膝关节置换和膝关节翻修手术。多数这些假体的设计基于西方人群的解剖数据。我们进行了膝关节的形态学研究来了解中国人胫骨干和胫骨平台的位置关系。方法：本研究包含50位研究对象（25位男性和25位女性）。用MRI扫描膝关节和胫骨干近端。测量胫骨干轴线和胫骨平台中心的距离并将其定义为胫骨干相对于胫骨平台的偏心距。分别在3个截骨面上测量偏心距，由上而下分别为通过内侧胫骨平台软骨面下、软骨面下5mm和软骨面下10mm。同时测量胫骨平台的直径。结果：在由上而下的3个截骨面上，胫骨干的偏心距分别为（7．23±2．44）mm[内外方向为（3．40±1．94）mrn，前后方向为（6．22±2．05）mm]、（6．33±2．26）mm[内外方向为（3．14±2．04）mm，前后方向为（5．24±1．96）mm]和（4．75±2．07）mm[内外方向为（2．68±1．91）mm，前后方向为（3．46±2．03）mm]。在每一个截骨面上，男性的平均胫骨干偏心距均明显大于女性。结论：中国人胫骨干相对于胫骨平台的偏心距存在较大变异。胫骨干轴线位于胫骨平台中心的前外侧。

Protrusio acetabuli in ankylosing spondylitis patients with end-stage hip involvement

Protrusio acetabuli(PA)is_a complication of a wide spectrum_of pathological disorders involving the hip joint,[1] The underlying.causes can be infammatory[2,3] traumatic,genetic,metabolic,infectious,and idiopathic.Inflammatory causes lead todestruction and weakening of the bone surrounding the hip with resultant migration along the joint-reaction vector.

Harvesting biomechanical energy in the walking by shoe based on liquid metal magnetohydrodynamics

A liquid metal magnetohydrodynamics generation system （LMMGS） was proposed and demonstrated in this paper for collecting parasitic power in shoe while walking. Unlike the conventional shoe-mounted human power harvesters that use solid coil and gear mechanism, the proposed system employs liquid metal （Ga62In25Sn13） as energy carrier, where no moving part is requested in magnetohydrodynamics generators （MHGs）. While walk- ing with the LMMGS, the foot alternately presses the two liquid metal pumps （LMPs） which are respectively placed in the front and rear of the sole. As a result, the liquid metal in the LMPs （LMP I and II） is extruded and flows through the MHGs （MHG I and II） in which electricity is produced. For a comparison, three types ofLMMGSs （LMMGS A, B and C） were built where all the parts are the same except for the LMPs. Furthermore, performances of these LMMGSs with different volume of injected liquid metal were tested respectively. Experimental results reveal that both the output voltage and power of the LMMGS increase with the volume of injected liquid metal and the size of the LMPs. In addition, a maximum output power of 80 mW is obtained by the LMMGS C with an efficiency of approximately 1.3%. Given its advantages of no side effect, light weight, small size and reliability, The LMMGS is well-suited for powering the wearable and implantable micro/nano device, such as wearable sensors, drug pumps and so on.

Wearable thermal energy harvester powered by human foot

With explosive applications of many advanced mobile electronic devices, a pervasive energy system with long term sustainability becomes increasingly important. Among the many efforts ever tried, human power is rather unique due to its independence of weather or geographical conditions and is therefore becoming a research focus. This paper is dedicated to demonstrate the possibility and feasibility of harvesting thermal energy from human body by sandwiching a thermoelectric generator （TEG） between human shoe bottom and ground, aiming to power a portable electronic device. Through the conceptual experiments conducted on adults, a maximum 3.99 mW steady state power output at a ground temperature with 273 K is obtained, which is sufficient enough to drive a lot of micro-electronic devices. Also, parametric simulations are performed to systematically clarify the factors influencing the TEG working performance. To further reveal the mechanism of this power generation modality, analytical solutions to the coupled temperature distributions for human foot and TEG module are obtained and the correlation between TEG characteristics and the output power are studied. It was demonstrated that, the TEG working as a wearable power resource by utilizing thermal energy of human foot shows enormous potential and practical values either under normal or extreme conditions.

罪犯“新知新行”文化心理建构与传统文化

在心理文化特征层面上,罪犯文化心理是在特定历史及文化背景下生成的,中国传统文化中对人的主体性和道德性的追求构成文化改造的天然助缘。传统文化作为文化改造的滥觞,在经济全球化带来的新自由主义思潮冲击下,处于一种自我维持并不断弱化的状态。只有加强社会主义核心价值观的教育,通过对传统文化进行扬弃,发展出符合时代精神的价值标准与判断,才能具有对异质性文化和思想的判断力与适应多元文化竞争的态势。通过重塑罪犯文化心理,能够让罪犯在做人的文化自觉中重新认识和评价自我,构建出具有中国文化特点的理论体系和方法论,文化改造才能由对传统文化的审美发展成为真正的社会科学。

大数据与狱政管理科学化

利用大数据技术促进狱政管理科学化,是利用大数据技术对狱政管理的各种数据进行加工、应用和反馈的过程,该过程在逻辑上是个封闭数字生态体系,最终体现在对罪犯的行为进行描述、断因和预测,并给出决策建议。只有对狱政管理中各维度进行相关性关系分析,才能突破因果关系律的束缚,狱政管理的各个因子也便具有更为广阔的理论解释空间,基于此的狱政管理决策便算是具有了真正的意义上的科学要素。