optimization

优化
  • 文章类型: Journal Article
    开发了成功的绿色小扁豆废水(GLW)预处理方法来替代鸡蛋。发现水与小扁豆的比例和微波预处理会影响泡沫和乳液质量,而盐的添加对GLW的泡沫和乳液质量没有影响。在最佳前提条件下获得的GLW用于确定松饼质量的最佳配方。烤箱类型,青扁豆面粉比例,导致最大水分含量的GLW比,体积指数,总酚含量,空气细胞的百分比面积,确定了控制松饼硬度的最小ΔE值。具有5.71%绿扁豆面粉和18.15%GLW配方的常规烤箱烘烤产生了与小麦粉和鸡蛋配方相当的产品。这项研究证明,废弃的GLW可以用作鸡蛋的替代品,这在面包店是很贵的原料.
    Successful pretreatments for green lentil wastewater (GLW) were developed to substitute egg. Water to lentil ratio and microwave pretreatment were found to affect foam and emulsion quality, while the addition of salt had no effect on foam and emulsion quality of GLW. The GLW obtained at optimum preconditions was used in the determination of best formulation for muffin quality. Oven type, green lentil flour ratio, GLW ratio leading to the maximum moisture content, volume index, total phenolic content, percent area of air cells, and minimum ΔE values with a constraint of control muffin\'s hardness were determined. Conventional oven baking with the formulation of 5.71% green lentil flour and 18.15% GLW produced comparable product with wheat flour and egg formulation. This study proved that discarded GLW can be used as a substitute for egg, which is an expensive ingredient in bakery.
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  • 文章类型: Journal Article
    本文的目的是回顾有关肱骨远端骨折钢板(DHFPs)的研究,以了解系统地改变钢板或螺钉变量的生物力学影响。问题是DHFP通常用于手术,尽管并发症仍然可能发生,目前尚不清楚植入物配置是否总是使用生物力学标准进行优化。对PubMed数据库进行了系统搜索,以确定DHFP的英语生物力学优化研究,这些DHFP参数改变了板和/或螺钉变量,以分析其对工程性能的影响。关节内和关节外骨折(EAF)数据根据常用的生物力学结果指标进行分离和整理。结果确定了52项合格的DHFP研究,评估各种板和螺钉变量。评估的最常见的板变量是几何形状,孔类型,number,和位置。评估螺钉变量的研究较少,数字和角度是最常见的。然而,没有研究检查非金属材料的板或螺钉,这可能对未来的研究感兴趣。此外,文章使用了生物力学结果指标的各种组合,如碎片间骨折运动,骨头,板,或螺钉应力,失效的加载周期数,和总刚度(Os)或破坏强度(Fs)。然而,没有研究评估骨板下的骨应力来检查骨应力屏蔽,“这可能会影响临床骨骼健康。治疗肱骨远端关节内和关节外骨折的外科医生应认真考虑两种预轮廓,长,厚,锁定,和由长固定的平行板,厚,和板对板螺钉,这些螺钉位于沿着板的近端部分的交错水平处,还有一个额外的跨骨折钢板螺钉。此外,研究工程师可以通过在未来的工作中细读建议来改进新的研究(例如,研究替代非金属材料或“应力屏蔽”),临床后果(例如,锁定板的好处),和学习质量(例如,计算研究的实验验证)。
    The goal of this article was to review studies on distal humerus fracture plates (DHFPs) to understand the biomechanical influence of systematically changing the plate or screw variables. The problem is that DHFPs are commonly used surgically, although complications can still occur, and it is unclear if implant configurations are always optimized using biomechanical criteria. A systematic search of the PubMed database was conducted to identify English-language biomechanical optimization studies of DHFPs that parametrically altered plate and/or screw variables to analyze their influence on engineering performance. Intraarticular and extraarticular fracture (EAF) data were separated and organized under commonly used biomechanical outcome metrics. The results identified 52 eligible DHFP studies, which evaluated various plate and screw variables. The most common plate variables evaluated were geometry, hole type, number, and position. Fewer studies assessed screw variables, with number and angle being the most common. However, no studies examined nonmetallic materials for plates or screws, which may be of interest in future research. Also, articles used various combinations of biomechanical outcome metrics, such as interfragmentary fracture motion, bone, plate, or screw stress, number of loading cycles to failure, and overall stiffness (Os) or failure strength (Fs). However, no study evaluated the bone stress under the plate to examine bone \"stress shielding,\" which may impact bone health clinically. Surgeons treating intraarticular and extraarticular distal humerus fractures should seriously consider two precontoured, long, thick, locked, and parallel plates that are secured by long, thick, and plate-to-plate screws that are located at staggered levels along the proximal parts of the plates, as well as an extra transfracture plate screw. Also, research engineers could improve new studies by perusing recommendations in future work (e.g., studying alternative nonmetallic materials or \"stress shielding\"), clinical ramifications (e.g., benefits of locked plates), and study quality (e.g., experimental validation of computational studies).
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  • 文章类型: Journal Article
    这项研究调查了内生真菌产生紫杉醇(Taxol®)的潜力,广泛用于化疗的一种有效的抗癌化合物。这项研究旨在确定,确认,并表征能够产生紫杉醇(PTX)的内生真菌并评估其紫杉醇产量。此外,探讨紫杉醇生产的影响因素。从红蒿根中收集并鉴定了100株内生真菌。在分离的内生真菌中,烟曲霉的PTX产量最高(26.373μgL-1)。该菌株被鉴定为A.fumigatiaffinis(登录号。PP235788.1)。分子鉴定证实了它的新颖性,代表A.fumigatiaffinis的PTX生产的第一份报告,紫蒿的一种内生菌。通过全因子实验设计(DOE)和响应面法(RSM)进行优化,在pH8.0,150μgL-1的最佳条件下,从1g真菌培养物的干重将PTX产量显着提高到110.23μgL-1补充酶,在马铃薯葡萄糖肉汤中发酵18天。使用薄层色谱法确认紫杉醇的存在,高效液相色谱法,和气相色谱-质谱法。这些发现最大限度地发挥了内生真菌产生次级代谢产物的作用,该代谢产物可能能够替代化学产生的PTX,并提供了在高浓度下提供可持续的PTX生态友好来源的机会。关键词:•内生真菌,比如熏蒸,显示出环保紫杉醇生产的希望•优化策略显着提高紫杉醇产量,达到110.23μgL-1•分子鉴定证实了新颖性,提供可持续的PTX来源。
    This study investigated the potential of endophytic fungi to produce paclitaxel (Taxol®), a potent anticancer compound widely employed in chemotherapy. This research aimed to identify, confirm, and characterize endophytic fungi capable of paclitaxel (PTX) production and assess their paclitaxel yield. Additionally, it aimed to investigate factors influencing paclitaxel production. A total of 100 endophytic fungal isolates were collected and identified from the roots of Artemisia judaica. Aspergillus fumigatiaffinis exhibited the highest PTX production (26.373 μg L-1) among the isolated endophytic fungi. The strain was identified as A. fumigatiaffinis (Accession No. PP235788.1). Molecular identification confirmed its novelty, representing the first report of PTX production by A. fumigatiaffinis, an endophyte of Artemisia judaica. Optimization through full factorial design of experiments (DOE) and response surface methodology (RSM) significantly enhanced PTX production to 110.23 μg L-1 from 1 g of dry weight of the fungal culture under optimal conditions of pH 8.0, 150 μg L-1 becozyme supplementation, and 18 days of fermentation in potato dextrose broth. The presence of paclitaxel was confirmed using thin layer chromatography, high performance liquid chromatography, and gas chromatography-mass spectrometry. These findings maximize the role of endophytic fungus to produce a secondary metabolite that might be able to replace the chemically produced PTX and gives an opportunity to provide a sustainable source of PTX eco-friendly at high concentrations. KEY POINTS: • Endophytic fungi, like A. fumigatiaffinis, show promise for eco-friendly paclitaxel production • Optimization strategies boost paclitaxel yield significantly, reaching 110.23 μg L -1 • Molecular identification confirms novelty, offering a sustainable PTX source.
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  • 文章类型: Journal Article
    目标:由于与地面急救医疗服务(EMS)相比,直升机急救医疗服务(HEMS)在单价方面是一种昂贵的资源,重要的是进一步研究哪些方法可以优化这些服务。这项研究的目的是评估医生配备HEMS与地面EMS相比在开发场景中的成本效益,并改进分诊,航空性能,并纳入缺血性卒中患者。
    方法:通过比较HEMS与地面EMS在六种不同情况下的健康结果和成本来评估增量成本效益比(ICER)。使用估计的30天死亡率和质量调整生命年(QALYs)来衡量健康益处。使用EuroQoL仪器评估生活质量(QoL),并对不同患者组进行了单向敏感性分析.生存估计来自国家FinnHEMS数据库,根据最近的财务报告进行成本分析。
    结果:在方案3.1中取得了最好的结果,包括减少了过度警报,航空性能提升,和缺血性卒中患者的评估。这种情况产生了1077.07-1436.09额外的QALY,ICER为33,703-44,937€/QALY。与目前的做法相比,这表示额外的QALY增加了27.72%,ICER减少了21.05%。
    结论:通过将卒中患者纳入派遣标准,HEMS的成本效益可以大大提高,由于总成本是固定的,成本效益是根据产能利用率确定的。
    OBJECTIVE: Since Helicopter Emergency Medical Services (HEMS) is an expensive resource in terms of unit price compared to ground-based Emergency Medical Service (EMS), it is important to further investigate which methods would allow for the optimization of these services. The aim of this study was to evaluate the cost-effectiveness of physician-staffed HEMS compared to ground-based EMS in developed scenarios with improvements in triage, aviation performance, and the inclusion of ischemic stroke patients.
    METHODS: Incremental cost-effectiveness ratio (ICER) was assessed by comparing health outcomes and costs of HEMS versus ground-based EMS across six different scenarios. Estimated 30-day mortality and quality-adjusted life years (QALYs) were used to measure health benefits. Quality-of-Life (QoL) was assessed with EuroQoL instrument, and a one-way sensitivity analysis was carried out across different patient groups. Survival estimates were evaluated from the national FinnHEMS database, with cost analysis based on the most recent financial reports.
    RESULTS: The best outcome was achieved in Scenario 3.1 which included a reduction in over-alerts, aviation performance enhancement, and assessment of ischemic stroke patients. This scenario yielded 1077.07-1436.09 additional QALYs with an ICER of 33,703-44,937 €/QALY. This represented a 27.72% increase in the additional QALYs and a 21.05% reduction in the ICER compared to the current practice.
    CONCLUSIONS: The cost-effectiveness of HEMS can be highly improved by adding stroke patients into the dispatch criteria, as the overall costs are fixed, and the cost-effectiveness is determined based on the utilization rate of capacity.
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  • 文章类型: Journal Article
    背景:在这项研究中,我们分离出一种产纤维素酶的细菌,解淀粉芽孢杆菌菌株elh,从米皮。我们采用了两种优化方法来提高纤维素酶的产量。首先,我们采用了一次单变量(OVAT)方法来评估单个物理和化学参数的影响.随后,我们采用响应面方法(RSM)来研究这些因素之间的相互作用。我们使用克隆载体大肠杆菌DH5α异源表达纤维素酶编码基因。此外,我们进行了硅分子对接分析,以分析纤维素酶和羧甲基纤维素作为底物之间的相互作用。
    结果:当在特定培养基中培养时,细菌分离物eh1表现出0.141±0.077U/ml的初始纤维素酶活性,即碱性液体介质(BLM),以米皮为基质。通过16SrRNA测序鉴定该菌株为解淀粉芽孢杆菌菌株elh1,在GenBank中分配了登录号OR920278。发现最佳孵育时间为发酵72h。尿素被确定为最合适的氮源,和葡萄糖作为最佳糖,导致产量增加到5.04±0.120U/ml。使用响应面方法(RSM)进行统计优化,纤维素酶的峰值活性达到14.04±0.42U/ml。该过程包括利用Plackett-Burman设计的初始筛选和利用BOX-Behnken设计的进一步改进。负责纤维素酶生产的基因,egl,在大肠杆菌DH5α中有效克隆和表达。转化的细胞表现出22.3±0.24U/ml的纤维素酶活性。egl基因序列保存在GenBank中,登录号为PP194445。计算机分子对接揭示了羧甲基纤维素的两个羟基与CMCase的结合袋内的Glu169的残基结合。这种相互作用形成两个氢键,亲和力得分为-5.71。
    结论:与未优化的培养条件相比,培养条件的优化显著提高了纤维素酶的产量。此外,egl基因的异源表达表明,纤维素酶的重组形式具有活性,并且有效的表达系统可以有助于提高酶的产量。
    BACKGROUND: In this study, we isolated a cellulase-producing bacterium, Bacillus amyloliquefaciens strain elh, from rice peel. We employed two optimization methods to enhance the yield of cellulase. Firstly, we utilized a one-variable-at-a-time (OVAT) approach to evaluate the impact of individual physical and chemical parameters. Subsequently, we employed response surface methodology (RSM) to investigate the interactions among these factors. We heterologously expressed the cellulase encoding gene using a cloning vectorin E. coli DH5α. Moreover, we conducted in silico molecular docking analysis to analyze the interaction between cellulase and carboxymethyl cellulose as a substrate.
    RESULTS: The bacterial isolate eh1 exhibited an initial cellulase activity of 0.141 ± 0.077 U/ml when cultured in a specific medium, namely Basic Liquid Media (BLM), with rice peel as a substrate. This strain was identified as Bacillus amyloliquefaciens strain elh1 through 16S rRNA sequencing, assigned the accession number OR920278 in GenBank. The optimal incubation time was found to be 72 h of fermentation. Urea was identified as the most suitable nitrogen source, and dextrose as the optimal sugar, resulting in a production increase to 5.04 ± 0.120 U/ml. The peak activity of cellulase reached 14.04 ± 0.42 U/ml utilizing statistical optimization using Response Surface Methodology (RSM). This process comprised an initial screening utilizing the Plackett-Burman design and further refinement employing the BOX -Behnken Design. The gene responsible for cellulase production, egl, was effectively cloned and expressed in E. coli DH5α. The transformed cells exhibited a cellulase activity of 22.3 ± 0.24 U/ml. The egl gene sequence was deposited in GenBank with the accession number PP194445. In silico molecular docking revealed that the two hydroxyl groups of carboxymethyl cellulose bind to the residues of Glu169 inside the binding pocket of the CMCase. This interaction forms two hydrogen bonds, with an affinity score of -5.71.
    CONCLUSIONS: Optimization of cultural conditions significantly enhances the yield of cellulase enzyme when compared to unoptimized culturing conditions. Additionally, heterologous expression of egl gene showed that the recombinant form of the cellulase is active and that a valid expression system can contribute to a better yield of the enzyme.
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  • 文章类型: Journal Article
    数学优化是许多科学和工业应用的核心。许多当前优化策略的一个重要问题是函数评估的数量与找到全局的概率之间的众所周知的权衡,或至少足够高质量的局部最优。在机器学习(ML)中,通过在主动学习中的扩展-例如用于自主实验-数学优化通常用于找到潜在的不确定代理模型,从中做出后续决策,因此ML依赖于高质量的优化来获得最准确的模型。主动学习通常会增加缺少离线训练数据的复杂性;因此,训练必须在数据收集期间进行,如果使用标准方法,这可能会阻碍采集。在这项工作中,我们强调了最近创建高性能混合优化算法(HGDL)的努力,将无导数全局优化策略与局部,基于导数的优化,最终产生唯一局部最优的有序列表。通过在较早遇到的最优值周围放空目标函数来避免冗余。HGDL旨在通过具有计算成本最高的过程来充分利用并行性,基于局部一阶和二阶导数的优化,在不同进程中的不同计算节点上并行运行。此外,该算法异步运行;一旦找到第一个解决方案,它可以使用,而算法继续寻找更多的解决方案。我们将提出的优化和训练策略应用于高斯过程驱动的随机函数逼近和主动学习。
    Mathematical optimization lies at the core of many science and industry applications. One important issue with many current optimization strategies is a well-known trade-off between the number of function evaluations and the probability to find the global, or at least sufficiently high-quality local optima. In machine learning (ML), and by extension in active learning - for instance for autonomous experimentation - mathematical optimization is often used to find the underlying uncertain surrogate model from which subsequent decisions are made and therefore ML relies on high-quality optima to obtain the most accurate models. Active learning often has the added complexity of missing offline training data; therefore, the training has to be conducted during the data collection which can stall the acquisition if standard methods are used. In this work, we highlight recent efforts to create a high-performance hybrid optimization algorithm (HGDL), combining derivative-free global optimization strategies with local, derivative-based optimization, ultimately yielding an ordered list of unique local optima. Redundancies are avoided by deflating the objective function around earlier encountered optima. HGDL is designed to take full advantage of parallelism by having the most computationally expensive process, the local first and second-order-derivative-based optimizations, run in parallel on separate compute nodes in separate processes. In addition, the algorithm runs asynchronously; as soon as the first solution is found, it can be used while the algorithm continues to find more solutions. We apply the proposed optimization and training strategy to Gaussian-Process-driven stochastic function approximation and active learning.
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  • 文章类型: Journal Article
    在大都市,由于废物产生率高和人口密集,管理垃圾收集车的最佳路线非常复杂。此外,错误设计的路线是浪费时间的来源,城市垃圾收集过程中的燃料和其他资源。系统分析了2011年至2023年发布的车辆路径问题(VRP)。大多数接受调查的研究都使用元启发式方法计算废物收集问题。这份手稿有两个目的:第一,对废物收集领域的VRP及其变体进行分类;第二,研究大多数元启发式方法在解决废物收集的VRP问题中所起的作用。对亚洲大陆的三个案例进行了分析,结果表明,元启发式算法能够为大规模数据提供良好的结果。最后,从强调研究差距到未来范围,提出了一些有希望的路径,以鼓励研究人员在废物管理路线问题领域开展研究工作。
    In metropolitan cities, it is very complicated to govern the optimum routes for garbage collection vehicles due to high waste production and very dense population. Furthermore, wrongly designed routes are the source of wasting time, fuel and other resources in the collection of municipal trash procedure. The Vehicle Routing Problem (VRP) published between 2011 and 2023 was systematically analysed. The majority of the surveyed research compute the waste collecting problems using metaheuristic approaches. This manuscript serves two purposes: first, categorising the VRP and its variants in the field of waste collection; second, examining the role played by most of the metaheuristics in the solution of the VRP problems for a waste collection. Three case study of Asia continent has been analysed and the results show that the metaheuristic algorithms have the capability in providing good results for large-scale data. Lastly, some promising paths ranging from highlighting research gap to future scope are drawn to encourage researchers to conduct their research work in the field of waste management route problems.
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  • 文章类型: Journal Article
    本研究的目的包括:(1)通过调查植物材料:培养基比例,优化从越橘叶废物中提取。提取介质,和提取期,在室温和高温下进行提取,或使用超声波和微波(M,HAE,阿联酋,MAE,分别),(2)物理化学表征,(3)提取物生物学潜力的调查。统计分析表明,最大多酚产量的最佳参数水平为1:30g/mL,乙醇50%(v/v)在2分钟的微波辐射。通过LC-MS分析,检测到29种酚类成分;HAE显示出几乎所有测定的多酚的最高丰富度,绿原酸和槲皮素3-O-葡糖苷酸占主导地位。所有提取物均显示出对金黄色葡萄球菌生长的高抑制作用。不同参数对提取物抗氧化能力的影响取决于所使用的测试。提取物还显示出对角质形成细胞活力和抗炎活性的刺激影响(在基于细胞的ELISA和红细胞稳定化测定中证实)。提取程序显着影响提取率(MAE≥浸渍≥UAE≥HAE),而电导率,密度,表面张力,和粘度在一个狭窄的范围内变化。本文的研究为最佳提取条件和技术提供了证据,化学成分,和抗氧化剂,抗菌,抗炎,越橘提取物的角质形成细胞活力特性在制药和化妆品中的潜在应用。
    The aims of the present research include (1) optimization of extraction from Vaccinium myrtillus leaf waste via investigation of plant material:medium ratio, extraction medium, and extraction period, employing extractions at room and high temperatures, or using ultrasound and microwaves (M, HAE, UAE, and MAE, respectively), (2) physicochemical characterization, and (3) investigation of extract biological potential. The statistical analysis revealed that optimal levels of parameters for the greatest polyphenolic yield were a proportion of 1:30 g/mL, ethyl alcohol 50% (v/v) during 2 min of microwave irradiation. By LC-MS analysis, 29 phenolic components were detected; HAE showed the highest richness of almost all determined polyphenols, while chlorogenic acid and quercetin 3-O-glucuronide were dominant. All extracts showed a high inhibition of Staphylococcus aureus growth. The effect of different parameters on extracts\' antioxidant capacity depended on the used tests. The extracts also showed a stimulative influence on keratinocyte viability and anti-inflammatory activity (proven in cell-based ELISA and erythrocyte stabilization assays). The extraction procedure significantly affected the extraction yield (MAE ≥ maceration ≥ UAE ≥ HAE), whereas conductivity, density, surface tension, and viscosity varied in a narrow range. The presented research provides evidence on the optimal extraction conditions and technique, chemical composition, and antioxidant, antimicrobial, anti-inflammatory, and keratinocyte viability properties of bilberry extracts for potential applications in pharmacy and cosmetics.
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  • 文章类型: Journal Article
    对基于II-VI半导体的电导式气体传感器的开发研究状况进行了综述。结果表明,II-VI化合物确实具有开发高效气体传感器所必需的特性。在这种情况下,为了达到所需的参数,可以使用为金属氧化物开发的所有方法。同时,在详细审查期间,结论是,基于II-VI化合物的传感器没有出现在气体传感器市场上的前景。主要障碍是表面状态的不稳定性,这导致操作期间参数的再现性差和传感器特性的漂移。
    A review of the state of research in the development of conductometric gas sensors based on II-VI semiconductors is given. It was shown that II-VI compounds indeed have properties that are necessary for the development of highly efficient gas sensors. In this case, to achieve the required parameters, all approaches developed for metal oxides can be used. At the same time, during a detailed review, it was concluded that sensors based on II-VI compounds have no prospects for appearing on the gas sensor market. The main obstacle is the instability of the surface state, which leads to poor reproducibility of parameters and drift of sensor characteristics during operation.
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  • 文章类型: Journal Article
    人体姿态估计(HPE)是计算机视觉和人工智能中使用的一种技术,用于使用图像或视频检测和跟踪人体部位和姿态。广泛用于增强现实,动画,健身应用,和监视,采用单目摄像机的HPE方法是高度通用的,并且适用于标准视频和CCTV镜头。这些方法已经从二维(2D)发展到三维(3D)姿态估计。然而,在现实环境中,当前在基于实验室的运动捕捉数据上训练的3DHPE方法遇到了挑战,例如有限的训练数据,深度模糊,左/右切换,和闭塞的问题。在这项研究中,使用真实世界视频,根据四种3DHPE方法的优缺点进行了比较。提出了关节位置校正技术,以消除和校正日常生活运动中关节位置的左/右倒置和错误检测等异常。使用基于3D人形模拟器的优化方法,获得了关节角度轨迹,以进行直观,信息丰富的人类活动识别,以通过所提出的技术校正的关节位置作为输入。通过将其应用于三种类型的徒手体操练习并比较运动过程中的关节角度轨迹,验证了该方法的有效性。
    Human pose estimation (HPE) is a technique used in computer vision and artificial intelligence to detect and track human body parts and poses using images or videos. Widely used in augmented reality, animation, fitness applications, and surveillance, HPE methods that employ monocular cameras are highly versatile and applicable to standard videos and CCTV footage. These methods have evolved from two-dimensional (2D) to three-dimensional (3D) pose estimation. However, in real-world environments, current 3D HPE methods trained on laboratory-based motion capture data encounter challenges, such as limited training data, depth ambiguity, left/right switching, and issues with occlusions. In this study, four 3D HPE methods were compared based on their strengths and weaknesses using real-world videos. Joint position correction techniques were proposed to eliminate and correct anomalies such as left/right inversion and false detections of joint positions in daily life motions. Joint angle trajectories were obtained for intuitive and informative human activity recognition using an optimization method based on a 3D humanoid simulator, with the joint position corrected by the proposed technique as the input. The efficacy of the proposed method was verified by applying it to three types of freehand gymnastic exercises and comparing the joint angle trajectories during motion.
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