Search results for "CUSUM"

Metodes viena un vairāku maiņas punktu atrašanai laikrindu datiem

2019

Maiņas punkti ir pēkšņas izmaiņas laikrindu datos. Maiņas punktu analīze ir būtiska laikrindu modelēšanā un prognozēšanā. Tā ir svarīga tādās nozarēs kā medicīna, vides zinātne, ekonomika u.c. Darba mērķis ir iepazīties ar maiņas punktu meklēšanas metodēm, pārbaudītšīsmetodesgansimulētiemdatiem,ganreāliemlaikrindupiemēriem.Darbateorētiskajādaļātiekaprakstītamaiņaspunktuproblemātikaganvienamaiņaspunktagadījumā, gan vairāku maiņas punktu gadījumā. Teorētiskajā daļā tiek apskatītas tādas viena maiņas punkta meklēšanas metodes kā CUSUM un robusta maiņas punkta meklēšanas metode, kas balstīta uz divu izlašu Hodža- Lēmaņa novērtējumu. Teorētiskajā daļā tiek apskatītas tādas vairāku maiņas punkta …

Application of Statistical Process Control to Continuous Processes

2002

Control charts represent an efficient and easy tool to assure the state of statistical quality control in a manufacturing process. These tools are also implemented in continuous processes, where the critical parameters are often monitored by on line sensors measuring data with short time intervals. In this paper a continuous process is monitored by using control charts and its dynamic is modeled through linear time series that allow the effects of the autocorrelation to be eliminated. In this way, the control charts can operate on residuals that result identically and independently distributed. A statistical analysis on EWMA, CUSUM and control charts for individual measurements has been car…

Toward fast and accurate emergency cases detection in BSNs

2020

International audience; In body sensor networks (BSNs), medical sensors capture physiological data from the human body and send them to the coordinator who act as a gateway to health care. The main aim of BSNs is to save peoples' lives. Therefore, fast and correct detection of emergencies while maintaining low-energy consumption of sensors is essential requirement of BSNs. In this study, the authors propose a new adaptive data sampling approach, where the sampling ratio is adapted based on the sensed data variation. The idea is to use the modified version of the cumulative sum (CUSUM) algorithm (modified CUSUM) that they previously proposed for wireless sensor networks to monitor the data v…

Maiņas punktu noteikšana būvju tehniskā stāvokļa monitoringā datiem uz vibrācijām balstītām metodēm

2022

Inženierzinātņu disciplīnās eksperimentāli iegūtajos laikrindu datos bieži vien ir svarīgi viennozīmīgi un efektīvi identificēt maiņas punktu. Kā piemēram, būvniecības nozarē veicot instumentētu konstrukciju tehnisko monitoringu, kur maiņas punkts var liecināt par konstrukcijas darbības izmaiņu vai bojājumu. Šajā darbā tiek analizētas trīs dažādu algoritmu (galīgo komponenšu analīze, kumulatīvo summu algoritms un robustā maiņas punktu noteikšana ar R pakotni robts) pielietojuma iespējas specifisku datu vidējās vērtības maiņas punktu noteikšanā. Darba ietvaros novērtēts iegūto rezultātu robustums un izstrādātas rekomendācijas šo algoritmu pielietošanai būvniecības nozarē, tai skaitā dažādu a…

Project monitoring by dynamic statistical control charts

2020

Project monitoring activities are fundamental to assure a timely identification of unacceptable project's deviations from the baseline, so that corrective actions may be taken to bring the project back in line with its objectives. Regarding this, the most used approach is the Earned Value Management (EVM) technique. However, traditional EVM metrics do not allow the Project Manager (PM) to recognize if project deviations are due to the natural project variability or to systemic and undiscovered causes that are moving the project to unacceptable out-of-controls. With this recognition, a statistical project control system based on the use of dynamic Shewhart's and CUmulative SUM (CUSUM) contro…

Cumulative-Sum-Based Localization of Sound Events in Low-Cost Wireless Acoustic Sensor Networks

2014

Wireless acoustic sensor networks (WASNs) are known for their potential applications in multiple areas, such as audio-based surveillance, binaural hearing aids or advanced acoustic monitoring. The knowledge of the spatial position of a source of interest is usually a requirement for many of these applications. Therefore, source localization is an important problem to be addressed in WASNs. Unfortunately, most localization algorithms need costly signal processing stages that prevent them from being implemented in low-cost sensor networks, requiring additional modules for signal acquisition and processing. This paper presents a low-complexity method for acoustic event detection and localizati…

Vito Cusumano

2013

Cáncer de colon. Estudio de base poblacional de la aplicación de las gráficas de control CUSUM en el análisis del estado ganglionar

2017

INTRODUCCIÓN. En nuestro medio, el cáncer colorrectal es el tumor maligno más frecuentemente diagnosticado en ambos sexos y representa una de las principales causas de muerte por cáncer. La afectación ganglionar se ha relacionado de una manera directa con la supervivencia y con el intervalo libre de enfermedad. El número total de ganglios analizados, incluso en los pacientes con estadio ganglionar pN0, es un demostrado factor pronóstico. Por lo que los nuevos métodos de estadificación ganglionar, cociente ganglionar (LNR) y logaritmo de odds ganglionar (LODDS), pueden ofrecer ventajas respecto a la clasificación TMN para la obtención de subgrupos de riesgo similar. Las gráficas Cumulative S…

A structured training pathway to implement robot-assisted minimally invasive esophagectomy: the learning curve results from a high-volume center

2019

ABSTRACTTo ensure safe implementation of robot-assisted minimally invasive esophagectomy (RAMIE), the learning process should be optimized. This study aimed to report the results of a surgeon who implemented RAMIE in a German high-volume center by following a tailored and structured training pathway that involved proctoring. Consecutive patients who underwent RAMIE during the course of the program were included from a prospective database. A single surgeon, who had prior experience in conventional MIE, performed all RAMIE procedures. Cumulative sum (CUSUM) learning curves were plotted for the thoracic operating time and intraoperative blood loss. Perioperative outcomes were compared between…