scholarly journals The ownership of digital infrastructure: Exploring the deployment of software libraries in a digital innovation cluster

2020 ◽  
Vol 35 (3) ◽  
pp. 251-269
Author(s):  
Lior Fink ◽  
Jianhua Shao ◽  
Yossi Lichtenstein ◽  
Stefan Haefliger
Keyword(s):  
Open Source ◽  
Third Party ◽  
Small Scale ◽  
Digital Innovation ◽  
Software Products ◽  
Software Libraries ◽  
Innovation Cluster ◽  
Digital Infrastructure ◽  
Start Up ◽  
Critical Components

Boundary resources have been shown to enable the arm’s-length relationships between platform owners and third-party developers that underlie digital innovation in platform ecosystems. While boundary resources that are owned by open-source communities and small-scale software vendors are also critical components in the digital infrastructure, their role in digital innovation has yet to be systematically explored. In particular, software libraries are popular boundary resources that provide functionality without the need for continued interaction with their owners. They are used extensively by commercial vendors to enable customization of their software products, by communities to disseminate open-source software, and by big-tech platform owners to provide functionality that does not involve control. This article reports on the deployment of such software libraries in the web and mobile (Android) contexts by 107 start-up companies in London. Our findings show that libraries owned by big-tech companies, product vendors, and communities coexist; that the deployment of big-tech libraries is unaffected by the scale of the deploying start-up; and that context evolution paths are consequential for library deployment. These findings portray a balanced picture of digital infrastructure as neither the community-based utopia of early open-source research nor the dystopia of the recent digital dominance literature.

The innovation cluster of ICT start-up companies in developing countries: case of Bandung, Indonesia

2015 ◽  
Vol 12 (1) ◽  
pp. 32 ◽  
Author(s):  
Wawan Dhewanto ◽  
Donald C. Lantu ◽  
Sri Herliana ◽  
Grisna Anggadwita
Keyword(s):  
Developing Countries ◽  
Innovation Cluster ◽  
Start Up

End-User-Driven Approach for Regulatory Compliance in the Public Cloud

2021 ◽  
Vol 12 (3) ◽  
pp. 1-19
Author(s):  
Jitendra Singh ◽  
Vikas Kumar
Keyword(s):  
Present State ◽  
Business Groups ◽  
Regulatory Compliance ◽  
Third Party ◽  
Expert Advice ◽  
Small Scale ◽  
Public Cloud ◽  
End User ◽  
The Public ◽  
Limited Budget

Regulatory compliance is equally binding on small and medium business groups. Owing to the small scale and limited budget, such SMBs are unable to seek expert advice. To adequately guard the SMBs in regulatory compliance, the present work proposed a third-party managed-end user-driven approach that renders the list of regulatory acts applicable in one's case according to the country of one's residence, services subscribed, and type of the operations to be carried out in subscribed cloud paradigm. The list of applicable regulatory acts are rendered at the subscriber's end only. In addition, the proposed method notifies the present state of compliance of under-considered cloud providers. Based on the recommendation received, the subscriber can proceed with his decision to subscribe or not to subscribe in the event if desired compliances do not exist. This technological assistance will eliminate the need to possess the required knowledge in regulatory acts or seeking advice from the regulatory expert.

Superalloy Cooling System for the Composite Rim of an Inside-Out Ceramic Turbine

2017 ◽  
Author(s):  
N. Courtois ◽  
F. Ebacher ◽  
P. K. Dubois ◽  
N. Kochrad ◽  
C. Landry ◽  
...  
Keyword(s):  
Gas Turbines ◽  
Cooling System ◽  
High Strength ◽  
Carbon Composite ◽  
Flow Rate Ratio ◽  
Small Scale ◽  
Inlet Temperature ◽  
Operating Temperatures ◽  
Critical Components ◽  
Inside Out

The use of ceramics in gas turbines potentially allows for very high cycle efficiency and power density, by increasing operating temperatures. This is especially relevant for sub-megawatt gas turbines, where the integration of complex blade cooling greatly affects machine capital cost. However, ceramics are brittle and prone to fragile, catastrophic failure, making their current use limited to static and low-stress parts. Using the inside-out ceramic turbine (ICT) configuration solves this issue by converting the centrifugal blade loading to compressive stress, by using an external high-strength carbon-polymer composite rim. This paper presents a superalloy cooling system designed to protect the composite rim and allow it to withstand operating temperatures up to 1600 K. The cooling system was designed using one-dimensional (1D) models, developed to predict flow conditions as well as the temperatures of its critical components. These models were subsequently supported with computational fluid dynamics and used to conduct a power scalability study on a single stage ICT. Results suggest that the ICT configuration should achieve a turbine inlet temperature (TIT) of 1600 K with a composite rim cooling-to-main mass flow rate ratio under 5.2% for power levels above 350 kW. A proof of concept was performed by experimental validation of a small-scale 15 kW prototype, using a commercially available bismaleimide-carbon (BMI-carbon) composite rim and Inconel® 718 nickel-based alloy. The combination of numerical and experimental results show that the ICT can operate at a TIT of 1100 K without damage to the composite rim.

Benchmark of a Novel Aero-Elastic Simulation Code for Small Scale VAWT Analysis

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
David Marten ◽  
Matthew Lennie ◽  
George Pechlivanoglou ◽  
Christian Oliver Paschereit ◽  
Alessandro Bianchini ◽  
...  
Keyword(s):  
Experimental Data ◽  
Wind Turbine ◽  
Open Source ◽  
Structural Model ◽  
Element Model ◽  
Small Scale ◽  
Elastic Model ◽  
Element Analysis ◽  
Simulation Code ◽  
Highly Nonlinear

After almost 20 years of absence from research agendas, interest in the vertical axis wind turbine (VAWT) technology is presently increasing again, after the research stalled in the mid 90's in favor of horizontal axis wind turbines (HAWTs). However, due to the lack of research in past years, there are a significantly lower number of design and certification tools available, many of which are underdeveloped if compared to the corresponding tools for HAWTs. To partially fulfill this gap, a structural finite element analysis (FEA) model, based on the Open Source multiphysics library PROJECT::CHRONO, was recently integrated with the lifting line free vortex wake (LLFVW) method inside the Open Source wind turbine simulation code QBlade and validated against numerical and experimental data of the SANDIA 34 m rotor. In this work, some details about the newly implemented nonlinear structural model and its coupling to the aerodynamic solver are first given. Then, in a continuous effort to assess its accuracy, the code capabilities were here tested on a small-scale, fast-spinning (up to 450 rpm) VAWT. The study turbine is a helix shaped, 1 kW Darrieus turbine, for which other numerical analyses were available from a previous study, including the results coming from both a one-dimensional beam element model and a more sophisticated shell element model. The resulting data represented an excellent basis for comparison and validation of the new aero-elastic coupling in QBlade. Based on the structural and aerodynamic data of the study turbine, an aero-elastic model was then constructed. A purely aerodynamic comparison to experimental data and a blade element momentum (BEM) simulation represented the benchmark for QBlade aerodynamic performance. Then, a purely structural analysis was carried out and compared to the numerical results from the former. After the code validation, an aero-elastically coupled simulation of a rotor self-start has been performed to demonstrate the capabilities of the newly developed model to predict the highly nonlinear transient aerodynamic and structural rotor response.

scholarly journals XML (almost) all the way

2015 ◽  
Author(s):  
Peter Flynn
Keyword(s):  
Human Factors ◽  
Open Source ◽  
Support Group ◽  
Open Source Software ◽  
Financial Resources ◽  
Small Scale ◽  
It Support ◽  
Source Journal ◽  
Almost All

In 2006 my university academic IT support group was approached by an academic colleague wanting to start a new journal, which would be available in electronic form only. There were restrictions imposed by the technical capabilities of the pool of authors, the requirements of the discipline, and — unsurprisingly — the lack of financial resources. The decision was made to implement a system using only open source software, and building largely from scratch, as the existing open source journal publishing systems at the time, although comprehensive and well-established, were seen as far too large and complex for the task. This paper is a case study describing the process and explaining the background to the decisions made. It attempts to draw some conclusions about the technical viability of creating a small-scale publishing system which attempted to retain XML throughout the workflow, and about the human factors which influenced the decisions.

scholarly journals Securing the wireless emergency alerts system

2021 ◽  
Vol 64 (10) ◽  
pp. 85-93
Author(s):  
Jihoon Lee ◽  
Gyuhong Lee ◽  
Jinsung Lee ◽  
Youngbin Im ◽  
Max Hollingsworth ◽  
...  
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Software Defined Radio ◽  
Severe Weather ◽  
Base Stations ◽  
The Public ◽  
Software Libraries ◽  
Amber Alerts ◽  
Almost All ◽  
To Receive

Modern cell phones are required to receive and display alerts via the Wireless Emergency Alert (WEA) program, under the mandate of the Warning, Alert, and Response Act of 2006. These alerts include AMBER alerts, severe weather alerts, and (unblockable) Presidential Alerts, intended to inform the public of imminent threats. Recently, a test Presidential Alert was sent to all capable phones in the U.S., prompting concerns about how the underlying WEA protocol could be misused or attacked. In this paper, we investigate the details of this system and develop and demonstrate the first practical spoofing attack on Presidential Alerts, using commercially available hardware and modified open source software. Our attack can be performed using a commercially available software-defined radio, and our modifications to the open source software libraries. We find that with only four malicious portable base stations of a single Watt of transmit power each, almost all of a 50,000-seat stadium can be attacked with a 90% success rate. The real impact of such an attack would, of course, depend on the density of cellphones in range; fake alerts in crowded cities or stadiums could potentially result in cascades of panic. Fixing this problem will require a large collaborative effort between carriers, government stakeholders, and cellphone manufacturers. To seed this effort, we also propose three mitigation solutions to address this threat.

scholarly journals A Study on the Sustainability of Microfinance Institutions in Serving the Low-Income Group in Malaysia

2021 ◽  
Vol 8 (Special Issue) ◽  
pp. 339-353
Author(s):  
Nur Harena Redzuan ◽  
Amir Abidin Bashir
Keyword(s):  
Low Income ◽  
Income Group ◽  
Small Scale ◽  
Microfinance Institutions ◽  
Poverty Eradication ◽  
The People ◽  
Start Up ◽  
Low Income Groups ◽  
The Government ◽  
The Impact

A microfinance scheme was introduced in Malaysia in the year 1987 as one of the alternatives to poverty eradication strategies in the country by the government. Since then, several institutions have created to carry out the agenda of providing small loans to the low-income group to start up their small-scale business to generate more sources of income to support their household consumption. However, for a certain reason, the people still do not find microfinance an important tool to uplift their economic positions. Most of the low-income groups are still unaware of this golden opportunity tailored for them. Besides, the sustainability of these subsidized microfinance systems implemented by Malaysia had not been appropriately studied. This study explores the attractiveness of the products offered by microfinance institutions and emphasizes the option that the participants must start utilizing the product. This research also explores microfinance facilities that contain conventional finance element which is prohibited in Islamic trade. The study also discusses the measures and actions taken by microfinance institutions in serving the low-income group in Malaysia. This paper employs a qualitative method through interviews and content analysis. The report, journal publications, and other related documents were also analyzed in achieving the objectives. The study provides the impact that it may pave the way to an indistinct understanding of how Islamic microfinance institutions sustain their operations.

A Study on the Temperature Calibration for a Small Electrical Resistance Furnace

2010 ◽  
Author(s):  
Un Bong Baek ◽  
Hae Moo Lee ◽  
Yun-Hee Lee ◽  
Seung Hoon Nahm
Keyword(s):  
Electrical Resistance ◽  
Power Plants ◽  
Low Cycle Fatigue ◽  
Small Scale ◽  
Temperature Calibration ◽  
Cycle Fatigue ◽  
Resistance Furnace ◽  
Small Space ◽  
Start Up ◽  
Electrical Resistance Furnace

A severe thermal stress occurs during start up/shutdown transients in thick walled components of high temperature power plants. Thus, a precise consideration of this issue is very important. Many researchers have studied low-cycle fatigue at high temperatures and small box-type electrical resistance furnaces have been developed for small-sized fatigue specimens. However, these small-scale electrical resistance furnaces need precise temperature calibrations because temperature control is difficult in a small space. Thus, a method for the temperature calibration of a box-type electrical resistance furnace is investigated and calibration procedures are proposed in this study.

Mainlining databases

2020 ◽  
Vol 14 (4) ◽  
pp. 534-546
Author(s):  
Tianyu Li ◽  
Matthew Butrovich ◽  
Amadou Ngom ◽  
Wan Shen Lim ◽  
Wes McKinney ◽  
...  
Keyword(s):  
Open Source ◽  
Data Science ◽  
Analytical Data ◽  
Transformation Process ◽  
Third Party ◽  
Learning Tools ◽  
Network Bandwidth ◽  
External Data ◽  
Data Formats ◽  
Comparable Performance

The proliferation of modern data processing tools has given rise to open-source columnar data formats. These formats help organizations avoid repeated conversion of data to a new format for each application. However, these formats are read-only, and organizations must use a heavy-weight transformation process to load data from on-line transactional processing (OLTP) systems. As a result, DBMSs often fail to take advantage of full network bandwidth when transferring data. We aim to reduce or even eliminate this overhead by developing a storage architecture for in-memory database management systems (DBMSs) that is aware of the eventual usage of its data and emits columnar storage blocks in a universal open-source format. We introduce relaxations to common analytical data formats to efficiently update records and rely on a lightweight transformation process to convert blocks to a read-optimized layout when they are cold. We also describe how to access data from third-party analytical tools with minimal serialization overhead. We implemented our storage engine based on the Apache Arrow format and integrated it into the NoisePage DBMS to evaluate our work. Our experiments show that our approach achieves comparable performance with dedicated OLTP DBMSs while enabling orders-of-magnitude faster data exports to external data science and machine learning tools than existing methods.

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