基于N-BEATS的能源互联网短期负荷预测

短期负荷预测在能源互联网的规划中既占重要组成部分,又是能源系统可靠高效运行的基础。在能源互联网中能源的短期负荷预测精度问题是人们重点关注问题。N-BEATS的深度神经结构未使用时序特别组成成分,仅使用一种基于后向和前向残差链路以及非常深的全连接层堆栈的深度神经架构。该结构具有可解释性、适用于广泛的目标域、并且训练速度快等优点。实验使用N-BEATS模型对历史负荷数据进行训练,然后对未来负荷进行短期负荷预测,取得了较高的预测精度。测得平均绝对百分比误差(eMAPE)为1.26%,平均绝对误差(eMAE)为84.238 kW,决定系数(R^(2))为0.9955,实验结果表明采用该方法的预测精度高于传统的预测方法,如在eMAPE方面相比TCN降低了0.61%。

基于专利数据应用LDA和N-BEATS组合方法的技术主题预测研究

预测技术主题未来热点,有助于企业在技术层面判别现状、识别未来技术方向并提前规划战略布局。提出LDA和N-BEATS组合方法,运用LDA模型提取专利文献数据的技术主题,引入N-BEATS网络模型分析各技术主题专利数量的时间序列,发挥其分析可解释性时间序列的优势,在预测模型中加入技术研发活动周期性模块,并以芯片技术为例,运用该组合方法预测产业的技术主题和未来趋势。对比实验中LDA和N-BEATS组合方法的预测精度高于LDA-LSTM、IPC-N-BEATS和IPC-LSTM三种基准方法。案例结果表明,未来芯片产业研发热点是电子级树脂、蚀刻机、芯片封装、芯片键合、抛光液。

基于N-BEATS神经网络的滚动轴承剩余寿命预测

针对轴承剩余使用寿命预测时采集到的信号序列复杂且不平稳,导致预测精度和性能较低的问题,采用经验模式分解对信号序列进行自适应分解,利用动态时间规整算法筛选主要退化特征,提取信号序列趋势特征,使用具有残差原理的深层神经网络N-BEATS进行预测。对于预测历史数据较少的问题,采用递归与直接相结合的预测结构对剩余寿命进行多步预测。将N-BEATS与长短时记忆神经网络、灰色预测模型进行比较,结果表明在不同工况下,所提出的方法预测结果的平均绝对误差相较于LSTM、灰色预测模型分别提升了3.2%以及3.3%,相对均方根误差分别提升了3.5%以及3.1%。

基于N-BEATS的单站对流层天顶总延迟预报

高精度对流层延迟先验值有助于加速精密单点定位的快速收敛。基于高精度高分辨率气象数据库,采用深度学习N-BEATS算法,进行了单站对流层天顶总延迟的预报试验。试验选取了9个IGS跟踪站,试验弧段从2002年1月至2019年6月共18.5 a。首先基于N-BEATS算法,设计了3种预报策略,然后基于前17.5 a针对不同预报策略进行模型训练,并对最后365 d的对流层天顶总延迟进行预报。试验结果表明,以该气象数据库为基准,12 h以内预报弧段的预报残差均值量级大多可达亚毫米,2 h、4 h、6 h的预报残差的标准差分别约为5 mm、9 mm、13 mm。

时序InSAR滑坡形变监测与预测的N-BEATS深度学习法——以新铺滑坡为例

滑坡通常发生突然,破坏力巨大,经常造成重大生命安全事故和财产损失。高可靠性、高精度及具有抗差性能的滑坡形变监测预测手段和方法对于国家防灾减灾需求具有切实意义。InSAR技术是一种能够全天时和全天候观测获取高空间分辨率和宽覆盖率影像,高灵敏性捕捉时空维动态变化的监测手段,然而目前应用InSAR时序影像对滑坡区进行滑坡预测的工作仅是凤毛麟角。基于时序InSAR观测结果,本文提出了一种能够有效解决中短期滑坡预测问题的深度学习滑坡预测方法。在三峡新铺滑坡区应用N-BEATS网络模型和Sentinel-1 SAR数据进行形变预测,以均方根误差1.1 mm的预测精度完成了滑坡预测工作,并对预测结果进行了数据结构影响的规律性分析、传统方法效果对比、抗差性评估及置信区间估计等多方位的剖析,结果显示出了其高精度、高可靠性及具有一定抗差能力的突出优势。

Systemic evaluation and Meta-analysis of Wenxin Keli in treatment of idiopathic premature beats in randomized controlled trails

Objective:To evaluate the efficacy and safety of Wenxin Keli for premature beats in structurally normal heart systematically.Methods:Eight databases at home and abroad were searched to collect randomized controlled trials of Wenxin Keli for premature beats without cardiac diseases.The included literatures were systematically evaluated with Cochrane Handbook 5.1 evaluation criteria and tools,and Meta analysis was performed with software RevMan5.3.Results:A total of 13 randomized controlled trials with 1278 subjects were included.The exprimental group used Wenxin Keli alone while the control group used antiarrhythmic medicine.The Meta analysis results showed that the total effective rate(RR=1.06,95%CI[0.97,1.16],P=0.23)and clinical symptom effective rate(RR=1.16,95%CI[0.94,1.44],P=0.18)of Wenxin Keli on idiopathic premature beats was not significantly different from western medicine group.The subgroup analysis of total effective rate showed that Wenxin Keli had no significant difference with metoprolol(RR=1.04,95%CI[0.95,1.15],P=0.41),bisoprolol(RR=1.32,95%CI[0.85,2.05],P=0.22)and propanone(RR=1.07,95%CI[0.90,1.26],P=0.44).ECG changes showed that the PR intervals(MD=-12.57,95%CI[-16.15,-8.99],P<0.00001)and QTc intervals(MD=-8.09,95%CI[-15.52,-0.65],P=0.03)in the western medicine group were prolonged significantly more than those of Wenxin Keli.In terms of safety,the incidence of adverse reactions of Wenxin Keli was significantly less than that of western medicine group(RR=0.32,95%CI[0.19,0.54],P<0.0001).Conclusion:The efficacy of Wenxin Keli in the treatment of premature beats with structurally normal heart is accurate,and there are no serious adverse reactions.However,because of the low quality of the included papers,which affected the reliability of the conclusions,high-quality clinical research is needed to further demonstrate.

Dirac Quantum Beats in Extreme Relativistic Diffraction in Time

We solve the relativistic Dirac equation for the shutter problem. We prove that, at intermediate relativistic energies, the probability density oscillates in time in a similar way to the optical Fresnel oscillations in a straight edge. However, for extreme-relativistic beams, the Fresnel oscillations turn into quantum damped beats.

Fifth-order phase-sensitive detection of ultrafast polarization beats in cascade four-level system

We study the colour-locked twin-noisy-field correlation effects in the fifth-order nonlinear susceptibility of ultrafast polarization beats in a cascade four-level system. More importantly, the fifth-order phase-sensitive heterodyne detection of ultrafast polarization beats has been exploited. The fifth-order nonlinear optical response can be controlled and modified through the colour-locked correlation of twin noisy fields. Thus, this method with the phase dispersion information is a good way to measure the real and imaginary parts of the fifth-order nonlinear susceptibility.

Clinical Efficacy of Ningxin Tongluo Decoction(宁心通络汤)Combined with Dapagliflozin on Patients of Type 2 Diabetes Mellitus Complicated with Ventricular Premature Beats

Objective:To explore the clinical efficacy of Ningxin Tongluo Decoction(宁心通络汤)combined with Dapagliflozin in the treatment of type 2 diabetes mellitus complicated with ventricular premature beats.Methods:Ninety-two patients with type 2 diabetes mellitus complicated with ventricular premature beats in our hospital were randomly divided into control group(n=46)and observation group(n=46).The control group was treated with routine Western medicine,and the observation group was treated with Ningxin Tongluo Decoction on the basis of the control group.The clinical efficacy of the two groups before and after treatment,TCM syndrome score,blood glucose levels[fasting blood glucose(GLU),glycosylated hemoglobin(Hb A1c)],glucose metabolism levels[fasting insulin(FINS),insulin resistance index(HOMA-IR)],the number of ventricular premature beats detected by 24-hour ambulatory electrocardiogram,heart rate turbulence(HRT)[initial oscillation(TO),oscillation slope(TS)],and heart rate variability(HRV)standard deviation of two normal R-R intervals(SDNN),standard deviation of average normal R-R intervals every 5 minutes(SDANN)and root mean square of adjacent normal R-R intervals(RMSSD)were observed.Results:After treatment,the total effective rate of the observation group was 89.13%,significantly higher than that of the control group(73.91%),and the difference was statistically significant(P<0.05).Both groups could reduce TCM syndrome score,blood glucose level,glucose metabolism level,reduce the number of ventricular premature beats,improve HRT and HRV levels,and the observation group was superior to the control group,and the difference was statistically significant(P<0.05).Conclusion:Ningxin Tongluo Decoction combined with Dapagliflozin is effective in treating type 2 diabetes mellitus patients with ventricular premature beats.It can reduce blood glucose level,improve HRV and HRT,improve autonomic nerve function and exert antiarrhythmic effect.

苹果网络音乐电台Beats1的综合优势和运营特点研究

苹果公司发布Beats1并称其为全球最大的网络音乐电台,引起音乐产业相关人士的广泛关注。本文通过对近年来音乐产业市场的数据对比分析,认为Beats1不仅综合了传统电台传播与新时代网络传播两大音乐传播媒介的优势于一体,表现为信息传播的实时性、内容接收的主动性和用户群体的社交性等;还具有运营平台的大众化、传播内容的专业化和覆盖范围的全球化等运营特点。通过对Beats1的优势及特点研究,可为音乐产业未来的发展趋势判断提供重要的参考和借鉴。

Static Stretching Combined with Conscious Slower Breathing May Increase Parasympathetic Activity and Reduce Stress in Adult Women

Background: Women are thought to be more susceptible to stress than men in a stressful society, and reducing stress is crucial for women to maintain their health. Static stretching (SST) is applied in various fields to not only increase muscle flexibility but also reduce stress. Additionally, conscious slower breathing (CSB) predominates parasympathetic activity, causing a relaxing effect. These results indicate that combining SST and CSB may be more useful in reducing stress. However, to the best of our knowledge, the effect of this combination remains unclear. Objective: This study aimed to elucidate the effects of the combination of SST and CSB on autonomic activity and stress in adult women. Methods: Eleven healthy Japanese adult female participants performed SST with nonconscious natural breathing for 20 min. The same participants performed SST in combination with CSB (2 s inspiratory and 4 s expiratory) for 20 min on another day. Salivary cortisol and chromogranin A levels were measured before and after stretching as stress markers of the hypothalamic-pituitary-adrenal axis and sympathetic nervous system. The coefficient of variation of the R-R interval (CVR-R) and high-frequency component (HF), which reflect parasympathetic nerve activity, and heart rate and low-frequency component (LF)/HF ratio, which reflect sympathetic nerve activity, were measured before, during, and after stretching. Results: SST decreased cortisol levels but with no significant changes in chromogranin A, heart rate, CVR-R, HF, or LF/HF ratio. The combination of SST and CSB increased CVR-R and HF levels in addition to decreasing cortisol levels but with no significant changes in chromogranin A, heart rate, or LF/HF levels. Conclusion: These results indicate that the combination of SST and CSB may increase parasympathetic activity and reduce stress. However, future randomized controlled trials with larger sample sizes should support this conclusion.

My Heart Beats for Mascao-An interview with Ng Lap Seng,CPCC Member and Chairman of Macao Sun Kian Ip Group

ＭｙＨｅａｒｔＢｅａｔｓｆｏｒＭａｓｃａｏ－ＡｎｉｎｔｅｒｖｉｅｗｗｉｔｈＮｇＬａｐＳｅｎｇ，ＣＰＣＣＭｅｍｂｅｒａｎｄＣｈａｉｒｍａｎｏｆＭａｃａｏＳｕｎＫｉａｎＩｐＧｒｏｕｐＢｙｓｔａｆｆｒｅｐｏｒｔｅｒＺＨＡＮＧＪＵＡＮＴＷＥＮＴＹｙｅａｒｓａ...

Evaluation of urea breath test as a diagnostic tool for Helicobacter pylori infection in adult dyspeptic patients

In this editorial,we discuss the article in the World Journal of Gastroenterology.The article conducts a meta-analysis of the diagnostic accuracy of the urea breath test(UBT),a non-invasive method for detecting Helicobacter pylori(H.pylori)infection in humans.It is based on radionuclide-labeled urea.Various methods,both invasive and non-invasive,are available for diagnosing H.pylori infection,inclu-ding endoscopy with biopsy,serology for immunoglobulin titers,stool antigen analysis,and UBT.Several guidelines recommend UBTs as the primary choice for diagnosing H.pylori infection and for reexamining after eradication therapy.It is used to be the first choice non-invasive test due to their high accuracy,specificity,rapid results,and simplicity.Moreover,its performance remains unaffected by the distribution of H.pylori in the stomach,allowing a high flow of patients to be tested.Despite its widespread use,the performance characteristics of UBT have been inconsistently described and remain incompletely defined.There are two UBTs available with Food and Drug Administration approval:The 13C and 14C tests.Both tests are affordable and can provide real-time results.Physicians may prefer the 13C test because it is non-radioactive,compared to 14C which uses a radioactive isotope,especially in young children and pregnant women.Although there was heterogeneity among the studies regarding the diagnostic accuracy of both UBTs,13C-UBT consistently outperforms the 14C-UBT.This makes the 13C-UBT the preferred diagnostic approach.Furthermore,the provided findings of the meta-analysis emphasize the significance of precise considerations when choosing urea dosage,assessment timing,and measurement techniques for both the 13C-UBT and 14C-UBT,to enhance diagnostic precision.

Advancements in breath-based diagnostics for pancreatic cancer:Current insights and future perspectives

Recent decades have seen a concerning surge in carcinogenic diseases,with cancer cases and deaths on the rise globally.Conventional diagnostic methods are often invasive and time-consuming,highlighting the need for fast,accurate,and painless alternatives.Non-invasive exhaled breath analysis emerges as a promising solution,with over 200 volatile organic compounds(VOCs)detected in exhaled air,showing potential as biomarkers for various diseases,including cancer.Despite the lack of standardized methodologies,advancements in analytical instruments have expanded detection capabilities,reaching 3500 VOCs.Studies have identified specific VOC patterns associated with different cancers,offering hope for non-invasive diagnosis.Techniques such as gas chromatography-mass spectrometry and electronic noses show promise in distinguishing between healthy individuals and cancer patients.However,further research and standardization are needed to realize the full clinical potential of breath-based diagnostics,particularly in the early detection of challenging cancers like pancreatic cancer.

Urea breath test for Helicobacter pylori infection in adult dyspeptic patients: A meta-analysis of diagnostic test accuracy

BACKGROUND Helicobacter pylori(H.pylori)infection has been well-established as a significant risk factor for several gastrointestinal disorders.The urea breath test(UBT)has emerged as a leading non-invasive method for detecting H.pylori.Despite numerous studies confirming its substantial accuracy,the reliability of UBT results is often compromised by inherent limitations.These findings underscore the need for a rigorous statistical synthesis to clarify and reconcile the diagnostic accuracy of the UBT for the diagnosis of H.pylori infection.AIM To determine and compare the diagnostic accuracy of 13C-UBT and 14C-UBT for H.pylori infection in adult patients with dyspepsia.METHODS We conducted an independent search of the PubMed/MEDLINE,EMBASE,and Cochrane Central databases until April 2022.Our search included diagnostic accuracy studies that evaluated at least one of the index tests(^(13)C-UBT or ^(14)C-UBT)against a reference standard.We used the QUADAS-2 tool to assess the methodo-logical quality of the studies.We utilized the bivariate random-effects model to calculate sensitivity,specificity,positive and negative test likelihood ratios(LR+and LR-),as well as the diagnostic odds ratio(DOR),and their 95%confidence intervals.We conducted subgroup analyses based on urea dosing,time after urea administration,and assessment technique.To investigate a possible threshold effect,we conducted Spearman correlation analysis,and we generated summary receiver operating characteristic(SROC)curves to assess heterogeneity.Finally,we visually inspected a funnel plot and used Egger’s test to evaluate publication bias.endorsing both as reliable diagnostic tools in clinical practice.CONCLUSION In summary,our study has demonstrated that ^(13)C-UBT has been found to outperform the ^(14)C-UBT,making it the preferred diagnostic approach.Additionally,our results emphasize the significance of carefully considering urea dosage,assessment timing,and measurement techniques for both tests to enhance diagnostic precision.Nevertheless,it is crucial for researchers and clinicians to evaluate the strengths and limitations of our findings before implementing them in practice.

Inter-Fraction Analysis of One Week Hypo-Fractionation of Deep Inspiration Breath Hold (DIBH) Technique for Left Sided Breast Cancer Radiation Treatment

The aim of this study was to investigate the inter-fraction variations, patient comfort and knowledge at Charlotte Maxeke Johannesburg Academic Hospital (CMJAH). The differences in set-up that occurred between treatment sessions for the left sided breast patients were observed and recorded. Measurements of routine set-up variation for 24 patients were performed by matching the cone beam computed tomography (CBCT) and the planning computed tomography (CT). Scans of all five fractions per patient were used to quantify the setup variations with standard deviation (SD) in all the three directions (anterior posterior, left right, and superior inferior). The patients DIBH comfort and knowledge was also evaluated. The average translational errors for the anterior posterior (AP, z), left-right (LR, x), and Superior-inferior (SI, y) directions were 0.40 cm, 0.40 cm, and 0.40 cm, respectively. The translation variation of the three directions showed statistical significance (P < 0.05). On comfort and knowledge investigation, among all participants, 80% moderately agreed that the therapist’s instructions for operating the deep inspiration breath hold (DIBH) technique were easy to understand, and 63.33% indicated that their comfort with the DIBH technique was neutral or average. The inter-fraction variations in patients with left-sided breast cancer were qualitatively analyzed. Significant shifts between CBCT and planning CT images were observed. The daily treatment verification could assist accurate dose delivery.

Identification of breath volatile organic compounds to distinguish pancreatic adenocarcinoma,pancreatic cystic neoplasm,and patients without pancreatic lesions

BACKGROUND Volatile organic compounds(VOCs)are a promising potential biomarker that may be able to identify the presence of cancers.AIM To identify exhaled breath VOCs that distinguish pancreatic ductal adenocar-cinoma(PDAC)from intraductal papillary mucinous neoplasm(IPMN)and healthy volunteers.METHODS We collected exhaled breath from histologically proven PDAC patients,radiological diagnosis IPMN,and healthy volunteers using the ReCIVA®device between 10/2021-11/2022.VOCs were identified by thermal desorption-gas chromatography/field-asymmetric ion mobility spectrometry and compared between groups.RESULTS A total of 156 participants(44%male,mean age 62.6±10.6)were enrolled(54 PDAC,42 IPMN,and 60 controls).Among the nine VOCs identified,two VOCs that showed differences between groups were dimethyl sulfide[0.73 vs 0.74 vs 0.94 arbitrary units(AU),respectively;P=0.008]and acetone dimers(3.95 vs 4.49 vs 5.19 AU,respectively;P<0.001).After adjusting for the imbalance parameters,PDAC showed higher dimethyl sulfide levels than the control and IPMN groups,with adjusted odds ratio(aOR)of 6.98(95%CI:1.15-42.17)and 4.56(1.03-20.20),respectively(P<0.05 both).Acetone dimer levels were also higher in PDAC compared to controls and IPMN(aOR:5.12(1.80-14.57)and aOR:3.35(1.47-7.63),respectively(P<0.05 both).Acetone dimer,but not dimethyl sulfide,performed better than CA19-9 in PDAC diagnosis(AUROC 0.910 vs 0.796).The AUROC of acetone dimer increased to 0.936 when combined with CA19-9,which was better than CA19-9 alone(P<0.05).CONCLUSION Dimethyl sulfide and acetone dimer are VOCs that potentially distinguish PDAC from IPMN and healthy participants.Additional prospective studies are required to validate these findings.

Beats忙分手

Beats正通过回购HTC曾经买下股份以及中断和魔声的合作,扫清障碍,重新规划自己的发展道路。曾经以专业音质和时尚设计风格横扫耳机市场的Beats Audio,正在忙于同曾经的伙伴解除合作关系。2012 CES大展前夕,Interscope Geffen A&M主席Jimmy

WANG FENG’S FIIL 突袭Beats

由于屡次与新闻头条擦身而过,汪峰已被网友调侃成为＂头条哥＂。然而近期汪峰却多次成为科技圈里的头条新闻人物,而帮助＂头条哥＂成功登顶的是名为FIIL的耳机品牌。汪峰以品牌创始人的身份发布了三款FIIL品牌耳机,立刻引来外界关注。由于FIIL在品牌运营模式上,与美国的Beats存在诸多相似之处,因此FIIL也被冠以＂中国版Beats＂之名。然而,汪峰在发布会上已明确表示不愿意将FIIL称为中国版Beats,其更多的是希望做出自己的特色和文化。那么汪峰是否能做到言行一致,还得看看FIIL具体的产品表现。

Analysis of the Effect of Psychological Nursing Combined with Breathing Exercises in Improving Lung Function in Patients with Pneumoconiosis

Objective: To analyze the effect of psychological nursing combined with breathing exercises on lung function of patients with pneumoconiosis, and to analyze the methods. A total of 64 cases of pneumoconiosis admitted from January 2020 to December 2022 were divided into the reference group and the experimental group by random numerical table. On the basis of symptomatic treatment, the control group was combined with conventional nursing measures and breathing exercises, while the experimental group was treated with psychological nursing on the basis of the control group, and the pulmonary function indexes and adverse mood of the two groups before and after nursing were compared. Results: There was no difference in SAS score, SDS score and pulmonary function indexes between the two groups before intervention (P > 0.05), and the SAS score in the experimental group was the SDS score was lower than that of the control group, and FEV1, FEV1% and FEV1/FVC were higher than those of the control group, and the P < 0.05 was lower.