SIAM undergraduate research online最新文献_第4页

Forecasting COVID-19 Vaccine Distribution in the United States, Japan, Taiwan, and China using the Auto-Regressive Integrated Moving Average (ARIMA) model 利用自回归综合移动平均(ARIMA)模型预测美国、日本、台湾和中国的COVID-19疫苗分布

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/21s145584x

Kefei Chen

{"title":"Forecasting COVID-19 Vaccine Distribution in the United States, Japan, Taiwan, and China using the Auto-Regressive Integrated Moving Average (ARIMA) model","authors":"Kefei Chen","doi":"10.1137/21s145584x","DOIUrl":"https://doi.org/10.1137/21s145584x","url":null,"abstract":"Developed at unprecedented speeds, vaccines have thus far played a crucial role in slowing down the COVID-19 pandemic around the world. Therefore, it is an absolute necessity for countries to be able to accu-rately forecast the distribution of vaccines. This paper uses an Auto-Regressive Integrated Moving Average (ARIMA) model to analyze and forecast 30 days of COVID-19 vaccine distribution for the United States, Japan, Taiwan, and China. Specifically, for the United States and Japan, the predicted variable was the percent of the population that was fully vaccinated while the predicted variable for Taiwan and China was the total number of doses administered. The data used to fit our model was pulled from a publicly available dataset compiled from various sources around the world. For each country, the training data consisted of that country’s vaccination data from whenever they first administered vaccines until July 19, 2021. After fitting the model on the training data, the model was then tested against 30 days of data from July 20, 2021 to August 18, 2021. The paper found that the univariate ARIMA model was able to, on average, forecast the distribution of COVID-19 vaccines within 5% of the actual value for each country.","PeriodicalId":93373,"journal":{"name":"SIAM undergraduate research online","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64315575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Discretized Migration Flow: A Vector Field Based Tool for Avian Mobility in Patchy Mechanistic Models of Early Pathogenic Spread 离散迁移流:基于向量场的早期致病性传播斑块机制模型中鸟类迁移的工具

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/21s1461381

Raphael Kelly

引用次数: 0

Introduction for M3 Winning Paper Remote Work: Fad or Future M3获奖论文远程工作简介:现在还是未来

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/22s1493136

Michelle Montgomery

引用次数: 0

Using artificial neural networks to classify optimal microswimmers based on their shapes 利用人工神经网络对最优微游泳者进行形状分类

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/22s1479816

Niyizhen Jin, Xinyue Qi, Nicole Surgent, Wanting Huang

引用次数: 0

Numerical Computation of Fractional Derivatives of Complex-Valued Analytic Functions 复值解析函数分数阶导数的数值计算

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/22s1520566

A. Higgins

引用次数: 0

Finding the optimum times to flip a beefsteak using a genetic algorithm 用遗传算法找出翻转牛排的最佳时间

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/21s1414917

Rebekah Chin

引用次数: 0

Spectral Touching Points in Two-Dimensional Materials 二维材料中的光谱接触点

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/21s143889x

Andrea R. Wynn

{"title":"Spectral Touching Points in Two-Dimensional Materials","authors":"Andrea R. Wynn","doi":"10.1137/21s143889x","DOIUrl":"https://doi.org/10.1137/21s143889x","url":null,"abstract":"A two-dimensional (2D) material is a crystalline material consisting of a single layer of atoms. These materials are used in many applications including photovoltaics, semiconductors, electrodes, and water purification. These materials’ atomic structures can be represented as a discrete infinite periodic graph. Using Floquet-Bloch theory, the spectrum of the Schrödinger operator can be calculated on these infinite graphical representations by computing the eigenvalues of the magnetic flux Schrödinger operator on a fundamental domain for every possible value of magnetic flux. Previous researchers have conjectured a relationship between the special physical properties of one 2D material, graphene, and the Dirac conical points which appear in the spectrum of its Schrödinger operator. However, graphene was the only material studied with respect to these Dirac conical points. The existence of spectral touching points in different two-dimensional materials is proved, including muscovite, quartz, and transition metal oxides, under certain conditions on electric potential. The spectral touching points found in transition metal oxides are not the Dirac conical points found in graphene, but rather a previously unknown type of spectral touching point, named the mesa touching point, which appears in the Schrödinger operator for transition metal oxides under certain conditions.","PeriodicalId":93373,"journal":{"name":"SIAM undergraduate research online","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64315165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum Evolution in One Dimensional Disordered Systems: Localisation and Oscillations 一维无序系统中的量子演化:局域化和振荡

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/22s1516373

E. Sharp

引用次数: 0

Implementation of Statewide Election Data to Examine Fairness of South Carolina District Maps: A Comparative Analysis of Approaches for Approximating Results in Uncontested Races 全州选举数据的实施以检验南卡罗来纳选区地图的公平性:在无竞争的竞选中近似结果的方法的比较分析

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/21s1437342

Alfie-Louise Brownless

{"title":"Implementation of Statewide Election Data to Examine Fairness of South Carolina District Maps: A Comparative Analysis of Approaches for Approximating Results in Uncontested Races","authors":"Alfie-Louise Brownless","doi":"10.1137/21s1437342","DOIUrl":"https://doi.org/10.1137/21s1437342","url":null,"abstract":"After each census, researchers analyze election data to provide information relevant to the redistricting process. South Carolina is among a collection of states which face certain issues regarding election analysis of fairness due to the presence of a large percentage of uncontested races. Although uncontested results are known to create analysis challenges, there is not a universal consensus on how to best handle these situations. Here we explore quantification of partisan fairness and the impact of using statewide election county-level data as a proxy for estimating uncontested results. We develop a district approximation method using statewide elections at the county scale and use known metrics to qualitatively and quantitatively evaluate resulting election characteristics in historical and simulated election contexts. The same metrics were then used to perform a thorough comparative analysis of other common approximation methods. We find county-level election data to be an effective tool in approximating uncontested elections by providing evidence to support the notion that county-level data is effective under multiple election conditions. Furthermore, analysis of different approximation methods show how measures of partisan fairness for a particular election can change based upon a particular approximation method, potentially affecting future interpretations of uncontested election results.","PeriodicalId":93373,"journal":{"name":"SIAM undergraduate research online","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64315016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid Testing in COVID and Modified SIR Model 快速测试在COVID和修改SIR模型

SIAM undergraduate research online Pub Date : 2022-01-01 DOI: 10.1137/21s1460399

Jiawei Chen, Ran Li, Junru Lin

引用次数: 0