Repository Analytics and Metrics Portal (RAMP) Workflow Documentation and Data Definition

The Repository Analytics & Metrics Portal (RAMP) is a web service that leverages Google Search Console (GSC) data to provide a set of baseline search engine performance metrics for a global, cross-platform group of institutional repositories (IR). Since launching in 2017, RAMP has grown from 3 to more than 50 participating repositories. The underlying data are unique in scope and size, and offer many opportunities for novel analyses of IR search engine performance. The data may be augmented to enable additional analyses including metadata mining and bibliometrics. In November 2019, the RAMP team released a publicly available subset of the RAMP dataset, consisting of daily GSC data for 35 participating repositories harvested between January 1 and May 31, 2019. The purpose of this article is to provide information and increased transparency about how RAMP data are harvested, processed, and audited for quality control. This article is also intended to serve as more extensive, complementary documentation for the published dataset and any published research findings that use RAMP data

Data Services and the Performing Arts

In the academic world, research is primarily seen through the scientific approach of collecting and interpreting scientific or numeric data, or the humanistic approach of comparing and interpreting texts. However, in the performing arts fields, academics see themselves on a spectrum between scholar and artist. Artistic scholarly research activities are often driven by the same requirements as humanities research. However, as artists, research often takes the form of listening to or watching performances. In this approach, performances and recordings are research data to these academics. How can libraries support this method of research? What are the implications for data curation in libraries? These and other questions will be explored in this article

IUB Libraries Video Streaming Service: A Technical Overview

A recording is not available for this presentation.The IUB Libraries Video Streaming Service received its soft launch in the Fall 2008 semester, allowing staff in Wells Library Media and Reserve Services to make both locally-digitized video and digital video files licensed from vendors available for online streaming by members of the IU community. This service was developed by the Digital Library Program in consultation with Media and Reserve Services, based in part upon previous pilots and prototypes supported by both DLP and Library Information Technology. In this presentation, we will demonstrate the functionality of the Video Streaming Service both from the perspective of a student or faculty member viewing a video and a library staff member loading a new video into the system. We will then discuss the technologies used to implement the service, including Adobe Flash Media Server, theffmpeg audio/video encoder, and locally-developed video drop box, content management, and workflow tools

Self-tuning resonant control of a 7-leg back-to-back converter for interfacing variable speed generators to 4-wire loads

This paper considers the control of a 7-leg back-to-back Voltage Source Inverter (VSI) arrangement feeding a 4-wire load from a 3-phase Permanent Magnet Synchronous Generator (PMSG) operating at variable speed. The PMSG is controlled using a sensorless Model Reference Adaptive System (MRAS) to obtain the rotor position angle. The 7-leg converter is regulated using Resonant Controllers (RCs) at the load side and self-tuning resonant controllers at the generator side. The control system is augmented by a feed-forward compensation algorithm which improves the dynamic performance during transients. Experimental results, obtained from a prototype, are presented and discussed

Power conversion for a novel AC/DC aircraft electrical distribution system

This paper proposes a novel and compact AC/DC electrical distribution system for new generation aircraft. In these new aircraft power systems, all loads are fed by two dc bus systems: at 28V and at +/-270V. The electrical distribution system, whose design and implementation are described in this paper, has only one primary AC source (360-900Hz at 230V) with all the required dc voltage levels being derived from this source. This solution enables elimination of the complex mechanical coupling apparatus currently used, for fixed frequency AC systems, to maintain the generator speed at constant level while the engines operate at variable speed. Under the proposed solution, all conversion stages needed to generate the various output voltage levels are implemented using power converters assembled in one unit. Each converter has a current control loop in order to regulate the output current even during output line short circuits and also to limit the inrush current to the circuit at turn-on. To prove the concept a 5 kW prototype was designed and tested, and demonstrated to meet all the specifications within relevant standards regarding input and output power quality

Robustness analysis and experimental validation of a fault detection and isolation method for the modular multilevel converter

This paper presents a fault detection and isolation (FDI) method for open-circuit faults of power semiconductor devices in a modular multilevel converter (MMC). The proposed FDI method is simple with only one sliding mode observer (SMO) equation and requires no additional transducers. The method is based on an SMO for the circulating current in an MMC. An open-circuit fault of power semiconductor device is detected when the observed circulating current diverges from the measured one. A fault is located by employing an assumption-verification process. To improve the robustness of the proposed FDI method, a new technique based on the observer injection term is introduced to estimate the value of the uncertainties and disturbances, this estimated value can be used to compensate the uncertainties and disturbances. As a result, the proposed FDI scheme can detect and locate an open-circuit fault in a power semiconductor device while ignoring parameter uncertainties, measurement error and other bounded disturbances. The FDI scheme has been implemented in a field programmable gate array (FPGA) using fixed point arithmetic and tested on a single phase MMC prototype. Experimental results under different load conditions show that an open-circuit faulty power semiconductor device in an MMC can be detected and located in less than 50ms

Fault detection for modular multilevel converters based on sliding mode observer

This letter presents a fault detection method for modular multilevel converters (MMC) which is capable of lo¬cating a faulty semiconductor switching device in the circuit. The proposed fault detection method is based on a sliding mode observer (SMO) and a switching model of a half-bridge, the approach taken is to conjecture the location of fault, modify the SMO accordingly and then compare the observed and measured states to verify, or otherwise, the assumption. This technique requires no additional measurement elements and can easily be implemented in a DSP or micro-controller. The operation and robustness of the fault detection technique are confirmed by simulation results for the fault condition of a semiconductor switching device appearing as an open-circuit

Control of a hybrid modular multilevel converter during grid voltage unbalance

The recently proposed parallel hybrid modular multilevel converter is considered to be a low loss, low component count converter with soft switching capability of the ‘main’ bridge. The converter has similar advantages to other emerging modular multilevel converter circuits being considered for HVDC power transmission. However, during ac network unbalance the individual ‘chain-links’ exchange unequal amounts of power with the grid which requires appropriate remedial action. This paper presents research into the performance of the converter and proposes a suitable control method that enables the converter to operate during grid voltage unbalance. The proposed control concept involves the use of asymmetric third harmonic voltage generation in the ‘chain-links’ of the converter to redistribute the power exchanged between the individual ‘chain-links’ and the grid. Mathematical analysis and simulation modelling with results are presented to support the work described

Big Bands

A performance by the USU Jazz Ensemble and USU Jazz Orchestra.https://digitalcommons.usu.edu/music_programs/1219/thumbnail.jp

Big Bands

USU Department of Music presents Big Bands.https://digitalcommons.usu.edu/music_programs/1146/thumbnail.jp