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Articles de revues sur le sujet "Micro Star Software (Firm)"
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Kuo, Anthony, Tsih-tse Lo, Dhanoos Sutthiphisal et Ivy Chiu. « Innovation as Guided Coevolution : The Trend Micro Case (1998 – 2005) ». KINERJA 24, no 1 (1 mars 2020) : 20–40. http://dx.doi.org/10.24002/kinerja.v24i1.3227.
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Innovation is considered crucial for firms to compete effectively. The extant research on innovation has provided significant insights, but, however, the majority examined innovation in the context of technology. Only a few exceptions have explored how social and behavioral factors influence firms in the innovation processes. Based on the coevolution perspective, this study examines innovation process of a software firm participating in the ever-changing information security software industry. We focused on how the firm guided its offerings to coevolve with new technologies and relevant changes among different groups of human actors. Our data reveals that the firm developed different offerings in different periods to cope with the changing driving forces—technologies, users, and hackers—in each period. Effectively identifying the driving forces and guided its offerings to coevolve with them, the firm successfully sustained its competitive advantage in the period characterized with turbulence in the environment.Keywords: innovation, coevolution, software, high-tech
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Putritamara, Jaisy Aghniarahim, Budi Hartono, Hery Toiba, Hamidah Nayati Utami, Moh Shadiqur Rahman et Dewi Masyithoh. « Do Dynamic Capabilities and Digital Transformation Improve Business Resilience during the COVID-19 Pandemic ? Insights from Beekeeping MSMEs in Indonesia ». Sustainability 15, no 3 (17 janvier 2023) : 1760. http://dx.doi.org/10.3390/su15031760.
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This study investigated the influence of Dynamic Capabilities (DC) and Digital Transformation (DT) on Business Resilience During the COVID-19 Pandemic. Using cross-sectional data from 388 micro, small, and medium enterprises (MSMEs) of beekeeping in Indonesia. Furthermore, the data were analyzed by Structural Equation Model (SEM) analysis and executed by SmartPLS 3.0 software. The main results of this study indicate that DC plays an important role in improving MSMEs’ DT. However, the essential role of DT on firm resilience only happened for micro, small, and medium firms of family businesses. However, DT has an insignificant effect on firm resilience in small nonfamily businesses. Yet, the effect of DC on firm resilience is mediated by DT. Nevertheless, our empirical findings indicate heterogeneous effects among micro, small, and medium firms. Based on the study’s findings, we suggested that the policy implication in developing beekeeping firms should be more specific based on the firm scale. The results of this study can be generalized to the national level to inform decision-making regarding the intangible assets of MSME livestock products in developing countries. The findings are also relevant to other livestock products, which tend to be dynamic during a crisis.
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Rehman, Naqeeb Ur. « Drivers of firms’ growth : a case study of software firms in Islamabad/Rawalpindi regions ». Journal of Management Development 34, no 8 (10 août 2015) : 901–21. http://dx.doi.org/10.1108/jmd-05-2014-0041.
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Purpose – The purpose of this paper is to identify the drivers of firm’s growth such as research and development (R & D), absorptive capacity, knowledge management, organisation culture, access to finance, internationalisation and so forth. As far as the contribution is concerned, two objectives have been achieved from this empirical paper. First, this paper fills an important gap in the literature by determining the drivers of firm’s growth. Second, this study analysed the Pakistani software industry at micro level by investigating the firm’s knowledge-based assets and their significant association with labour productivity growth. Based on a face to face interview of 69 software firms, this study found that firm size, access to finance, internationalisation (exporting and outward foreign direct investment), business improvement methods and knowledge management have a positive impact on the firm’s labour productivity growth. In comparison, firm undertaking R & D and absorptive capacity showed negative association with labour productivity growth. This study implies that these software firms have low investment in knowledge-based assets. In summary, this empirical study suggests that high sunk costs, low investment in knowledge-based assets and shortage of skills generally affect the labour productivity of these software firms. Design/methodology/approach – Survey analysis, using cross section data analysis. Findings – This study found that firm size, access to finance, internationalisation (exporting and outward FDI), business improvement methods and knowledge management have a positive impact on the firm’s labour productivity growth. In comparison, firm undertaking R & D and absorptive capacity showed negative association with labour productivity growth. In summary, this empirical study suggests that high sunk costs, low investment in knowledge-based assets and shortage of skills generally affect the labour productivity of these software firms. Research limitations/implications – Additionally, suggestions for future research would be to investigate the relationship between drivers of firm growth and innovation performance. The survey analysis could be extended to other parts of country such as Karachi and Lahore for resolving causality. Originality/value – First, this paper fills an important gap in the literature by determining the drivers of firm’s growth. Second, this study analysed the Pakistani software industry at micro level by investigating the firm’s knowledge-based assets and their significant association with labour productivity growth.
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Kipp, Peter C., Yibo (James) Zhang et Amanuel F. Tadesse. « Can Social Media Interaction and Message Features Influence Nonprofessional Investors' Perceptions of Firms ? » Journal of Information Systems 33, no 2 (1 février 2018) : 77–98. http://dx.doi.org/10.2308/isys-52067.
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ABSTRACT We investigate the impact of social media messages on nonprofessional investors' assessments of management credibility and firm value. In a between-participants experiment, we examine the joint effect of social media message vividness, valence, and micro-blogger influence on nonprofessional investors' assessments of management credibility and firm value. We find that when social media messages are pallid and negative (positive), high micro-blogger influence decreases (increases) nonprofessional investors' assessments of management credibility. In contrast, the effect is absent when messages are vivid. Further, we find that the effect of micro-blogger influence on nonprofessional investors' assessments of blogger credibility and management credibility is mediated by social media interactions. The assessment of management credibility, in turn, significantly impacts nonprofessional investors' firm valuation assessment. The results have implications for regulators (SEC 2013) that may wish to update their guidance to managers on how to monitor or even control nonprofessional investors' interaction on social media platforms. Data Availability: Contact the authors.
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Tjørnehøj, Gitte, et Lars Mathiassen. « Improvisation during Process-Technology Adoption : A Longitudinal Study of a Software Firm ». Journal of Information Technology 25, no 1 (mars 2010) : 20–34. http://dx.doi.org/10.1057/jit.2009.20.
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Most software firms struggle to take advantage of the potential benefits of software process improvement (SPI) as they adopt this technology into the complex and dynamic realities of their day-to-day operation. Such efforts are therefore typically fluctuating between management's attempt to control SPI technology adoption and events that causes the process to drift in unpredictable directions. To further understand how management's attempt to control the process is complemented by drifting, this article investigates the role of improvisation in adoption of SPI technology in a Danish software firm, SmallSoft, over a 10-year period (1996–2005). We found that micro-level and macro-level improvisations interacted, often in uncoordinated ways, to shape SPI technology adoption at SmallSoft. The improvisations enhanced employee creativity, motivation and empowerment, created momentum in the adoption process despite constrained resources, and, most importantly, helped adapt SPI technology to the everyday practices at SmallSoft. However, we also identified un-called for improvisations and outcomes that were uncoordinated with SmallSoft's goals. Based on these findings we discuss how management in small software firms can exploit improvisations to facilitate adoption of complex technologies like SPI.
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Barinta, Dunga Dwi, Siti Aisjah et Christin Susilowati. « Entrepreneurial orientation and market orientation as drivers of Micro Small Medium Entrepises (MSMEs') Performance ». Journal of Business and Management Review 3, no 8 (23 août 2022) : 548–62. http://dx.doi.org/10.47153/jbmr38.4172022.
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Micro, Small and Medium Enterprises (MSMEs) contribute to the Gross National Income (GDP) up to 40% and the creation of new job vacancies. Based on 25% of the total number of MSMEs in Indonesia cannot produce during the pandemic. In addition, internal problems such as lack of business knowledge, IT updates, low understanding in market make most MSMEs have low firm performance. Firm performance is an important part of a company to observe and evaluate the suitability of the results in business activities with the predetermined plan. Some researchers believe that firm performance is affected by Entrepreneurial Orientation and Market Orientation. This research was conducted by MSMEs that run their businesses in Malang City, East Java Indonesia. Data collection uses non-probability method approach with simple random sampling technique. The number of respondents collected in this study amounted to 112 respondents, but which can be used in data processing was amounted to 101 respondents. The method of data analysis uses SEM (Structural Equation Modeling) based on Partial Least Square (PLS) using SmartPLS 3.3 software application. This study aims to investigate the role of Entrepreneurial Orientation and Market Orientation in improving the performance of MSMEs. The research findings that entrepreneur orientation and market orientation are proven to have an effect on improving the performance of MSMEs. However, entrepreneur orientation cannot have a direct impact on improving performance. Entrepreneur orientation must be supported by market orientation in improving MSME performance
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Zhou, Helper, et Robert Zondo. « Do Firms’ Growth Rates Follow a Random Walk ? Evidence from Incubated Small and Medium Enterprises in South Africa ». African Journal of Inter/Multidisciplinary Studies 5, no 1 (2023) : 1–12. http://dx.doi.org/10.51415/ajims.v5i1.1091.
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Debate on the validity of the Law of Proportionate Effect (LPE) on firm growth is ongoing decades after it was postulated by Gibrat in 1931. The theoretical model which asserts that firm growth follows a random walk has been largely tested in developed economies using data from non-incubated firms, with scanty research in developing regions like Africa. This paper, therefore, aims to address this gap by being the first to assess the validity of Gibrat's law on incubated small, medium, and micro enterprises (SMMEs) in South Africa. The study utilised four-year panel data from 300 incubated SMMEs across the country, for the period between 2018 to 2021. Utilising the Law's generalised growth rate model, the generalised least square regression modelling was harnessed, using R Software. The findings, using sales as firm size proxy, confirmed Gibrat’s Law. The results showed that firm size had no effect on the sales growth rate of incubated firms, on the other hand when employment proxied performance the LPE was rejected. The findings provide important implications for both practitioners and pertinent stakeholders in the SMME sector in South Africa.
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Truong, Thanh Hang, et Thu Ha Dang. « The impact of capital structure on financial performance - an empirical study at hotel firms in Hanoi ». Journal of Economic and Banking Studies 4, no 1 (juin 2024) : 39–48. http://dx.doi.org/10.59276/jebs.2024.06.2652.
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The article examines the impact of capital structure (CS) on financial performance (FP) of hotel firms. A sample size of 72 of 3 - 5 star hotel firms in Hanoi city, Vietnam in a period of 3 years from 2016 to 2019 has been taken to analyze. Firm FP is measured by ROA, ROE, ROS. The study which applies quantitative methods along with the support of EVIEWS software points out a statistical significance relationship. Firstly, the CS has a contrariwise impact on ROA but no effect on ROE and ROS. Secondly, among control variables (asset structure, expenditure ratio, revenue), the expenditure ratio is the only one showing a contrariwise impact on ROS and the rest has no statistical significance
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Xu, Yang, et Chengming Li. « Digital Transformation, Firm Boundaries, and Market Power : Evidence from China’s Listed Companies ». Systems 11, no 9 (19 septembre 2023) : 479. http://dx.doi.org/10.3390/systems11090479.
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Digital transformation is seen as an “elixir” for companies to improve their economic performance and expand their market power in the digital economy. Therefore, how does digital transformation affect enterprises’ market power? This paper used machine learning to construct a digital transformation index and used panel data of listed enterprises from 2008 to 2020 to study the impact of digital transformation on market power and its mechanism of action. The findings showed that digital transformation significantly increases market power, and this conclusion still holds after considering potential endogeneity issues and conducting robustness tests. The results of mechanism analysis revealed that digital transformation facilitates endogenous scale expansion and promotes merger and acquisition (M&A), which reshapes firm boundaries and, thus, enhances market power. This paper revealed new changes in the micro-organization of enterprises in the context of digital transformation and provided micro-evidence for the industrial organization effect of digital transformation.
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Keller, Felipe Hatzenberger, Everaldo Luis Daronco et Marcelo Cortimiglia. « Strategic tools and business modeling in an information technology firm ». Brazilian Journal of Operations & ; Production Management 14, no 3 (6 septembre 2017) : 304. http://dx.doi.org/10.14488/bjopm.2017.v14.n3.a4.
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Many small companies active in the segment of information and communication technology demonstrate difficulties in terms of expanding their business and increasing the product and service portfolio. In this context, this study aims to apply strategic tools and business model in a micro-segment of the software industry inserted into a huge market competition and low entry barriers. A qualitative research was carried out, unfolded in three stages: initial diagnosis, which is developed in the current map of the business model and analysed in the internal and external environments through tools such as PESTEL, Porter's 5 forces and SWOT matrix; critical analysis, when opportunities for improvement were identified based on analysis of the environment and questionnaires applied to current and potential customers and; restructuring and identifying improvements, a stage that includes the redesign of the idealized business model, stipulating coefficients of importance for further start-up study, by applying cross SWOT analysis. Among the main results to new technologies, media release, complementary services and support partnerships are adapted.
Thèses sur le sujet "Micro Star Software (Firm)"
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Chuang, Tzu-wei, et 莊子葳. « A Cast Study in the Micro-entrepreneurships and Business models by Taiwan’s Open Source Software Firm ». Thesis, 2009. http://ndltd.ncl.edu.tw/handle/2w9vq2.
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碩士國立中山大學
傳播管理研究所
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This paper, based on case study method of Taiwan’s OSS Firm - Potix Technology Co., Ltd., is conducted in one organization through literature reviewed, documentations collected and analysed, and the researchers’ observations and participation involved. The paper conceptually develops a model of micro-entrepreneurships with substantial literatures that support the six dimensions including entrepreneurs/teams, opportunities, resources, environment, process, and performance. This paper building on a framework of business models including product innovation, customer relationship, infrastructure management, financial aspects. As a result, the researchers provide the basis for further research upon the management and advancement of micro-entrepreneurships. The contribution of this study: 1.One organization through literature reviewed of micro-enterprise, open source, business models. 2.To use a real business case as an example to analyze the open-source software company that Micro-entrepreneurships issues involved. 3.Proposed "opportunities - value" of the bull’s-eye diagram concept. 4.One systematic organization of the case study for micro-entrepreneurship development course and characteristics of various stages, copyright type, business model.
Livres sur le sujet "Micro Star Software (Firm)"
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Startz, Richard. EViews illustrated for version 7. 2e éd. Irvine, CA : Quantitative Micro Software, 2009.
Trouver le texte intégralChapitres de livres sur le sujet "Micro Star Software (Firm)"
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Suriyan, Kannadhasan, R. Nagarajan et Kanagaraj Venusamy. « Recent Trends in Robotic Process Automation ». Dans Global Perspectives on Micro-Learning and Micro-Credentials in Higher Education, 276–88. IGI Global, 2024. http://dx.doi.org/10.4018/979-8-3693-0343-6.ch016.
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Robotic Process Automation (RPA), according to their whitepaper, can be used to automate rule-based processes and, in this way, emulate human behavior. RPA interacts with the application layer of any application and has the ability to work across different apps. Taking the robot out of the human is the inevitable evolution of labor arbitrage. Its specific advantages, such as its affordability, scalability, and ease of deployment, make it more valuable. According to the chapter, in RPA, personnel in a firm can create computer software or “robots” to capture and interpret existing applications, conduct transactions, manipulate data, trigger reactions, and communicate with other digital systems. RPA is an application of technology. Any work process that is rule-based, workflow-driven, and repeatable can be assigned to a robot using RPA. This study also investigates if a robot-supported human-like interface could be a better choice for solving customer issues than people alone. For the research, they employed both quantitative and qualitative methods, including a questionnaire and an interview.
Actes de conférences sur le sujet "Micro Star Software (Firm)"
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Wang, Kun, Di Zhu et Ningsong Qu. « Investigation on Wire Electrochemical Micro Machining ». Dans 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21167.
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Wire electrochemical micro machining (WEMM) using the online-fabricated micro wire electrode is proposed as a new method of micro machining. Based on electrochemical principle, the mechanism of nanosecond pulses WEMM was investigated. The hardware of the control system was founded using devices of virtual instruments, and the software of the system was designed based on Labwindows/CVI. The micrometer scale wire electrode was online fabricated, the diameter of wire electrode was real-time monitored by precisely measuring the variation in resistance of the electrode, and it is possible that accomplish the fabrication of wire electrode and the following processes continuously in the same machining system. The relations between the machining accuracy and parameters, such as velocity of feed forward and pulses parameters was experimentally studied, and a series of high-aspect-ration micro structure and multi-microgrooves were fabricated. The research of the paper sets up a firm foundation for application of the proposed wire electrochemical micro-machining.
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Amano, Ryoichi S., Ahmad I. Abbas, Mohammad D. Qandil et Muhannad R. Al-Haddad. « Multi-Disciplinary Design Optimization of a Horizontal Micro Kaplan Hydro Turbine ». Dans ASME Turbo Expo 2019 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90509.
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Abstract This study investigates a performance-based design optimization for a Kaplan hydro turbine at a maximum water head of 2.6 m (8.5 ft), micro-sized horizontal Kaplan turbine with 7.6 cm (3.0 in) diameter that is featured fixed blades to attain the optimum performance for such type and size of hydro turbines. Optimization process includes solving design problems and enhance design development by applying a multi-disciplinary design optimization (MDO) technique. Varying the geometrical parameters of the turbine, i.e., dimensions, number of blades, blade wrap angles, and different rotational speeds (500–3000 RPM) are the relevant proposed disciplines of this study. An in-house code is used for optimizing the geometrical parameters of the turbine. A numerical solution that utilizes computational fluid dynamics (CFD) for a 3D, turbulent, transient unsteady and swirl flow is developed using STAR-CCM+ software in conjunction with an experimental setup of a lab-sized closed-loop water system for validation. The performance of the turbine is predicted by evaluating the power output (in watts), mesh independency analysis is also presented for CFD results validation. Two multi-simulation matrices were solved by using the high-performance computing (HPC) cluster of the University of Wisconsin-Milwaukee. First matrix includes different number of the blades (3, 4, 5, 6, and 7 blades) over six different rotational speeds (500, 1000, 1500, 2000, 2500, and 3000), while the second matrix includes 121 possible combinations of blade wrap angles starting at 60°-60° (hub-shroud) angle to 110°-110° angle with 5° increment alternated at both sides, the hub and the shroud.
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Liu, Chi-Rong, et Hsin-Yi Shih. « Model Analysis of Syngas Combustion and Emission for a Micro Gas Turbine ». Dans ASME Turbo Expo 2014 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25589.
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The purpose of this study is to investigate the combustion and emission characteristics of syngas fuels applied in a micro gas turbine, which is originally designed for a natural gas fired engine. The computation results were conducted by the commercial CFD software STAR-CD, where the three-dimension compressible k-ε model for turbulent flow and PPDF (Presumed Probability Density Function) model for combustion process were constructed. As the syngas are substituted for methane, the total heat input from the blended fuels and the fuel flow rates are varied with syngas compositions and syngas substitution percentages. The computed results presented the syngas substitution effects on the combustion and emission characteristics at different syngas percentages (up to 80%) for two typical syngas compositions and the conditions where syngas applied at fixed heat input were examined. Results showed the flame structures varied with different syngas substitution percentages. The high temperature regions were dense and concentrated on the core of the primary zone for H2-rich syngas, and then shifted to the sides of the combustor when syngas percentages were high. The NOx emissions decreased with increasing syngas percentages, but NOx emissions are higher at higher hydrogen content for the same syngas percentage. The CO2 emissions also decreased at 10% syngas substitution, but then increased as syngas percentage increased. Only using H2-rich syngas could produce less carbon dioxide. The detailed flame structures, temperature distributions, and gas emissions of the combustor were presented and compared. The exit temperature distributions and pattern factor were also discussed. Before syngas fuels are utilized as an alternative fuel for the micro gas turbine, further experimental testing are needed as the CFD modeling results provide a guidance for the improved designs of the combustor.
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Hussain, Khaja Fayaz, Wesley J. Cantwell et Kamran A. Khan. « Origami-Inspired Cylindrical Structures for Energy Absorption in Aerospace Applications ». Dans ASME 2023 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/imece2023-113488.
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Abstract The current work emphasizes on hybridization of the cylindrical curved crease origami structure with high energy absorbing state-of-the-art cellular lattices mainly, the plate, truss, and hourglass lattices, with a motive to enhance the energy absorption capability of the structure. A novel non-hybridized curved crease cylindrical origami namely star curved and three of its hybridized counterparts, star curved plate (S.C.P), star curved truss (S.C.T) and star curved hourglass (S.C.HG) are proposed in the paper and the effect of hybridization on the energy absorption properties was investigated. Additionally, the deteriorating effect of moisture on the mechanical properties and energy absorption characteristics was emphasized and it was observed that the dried samples outperformed the as-fabricated samples. The structures were designed with the help of CAD software and fabricated via fused filament fabrication (FFF) due to its capability of providing geometrical flexibility and precise control of micro architecture and dimensions using Nylon polymer. The structures were later tested on an Instron compression testing machine to obtain the force-displacement data for further processing. The results substantiate the validity of the hybridization approach as the specific energy absorption of the non-hybridized structure was enhanced from 4 kJ/kg to 6.6 kJ/kg. Moreover, the mechanical properties like peak strength and elastic modulus were remarkably improved from 1.3MPa to 6.5 MPa and 41 MPa to 290MPa respectively. The proposed approach leads to an increase in possibilities for improving the origami-inspired structures in terms of specific energy absorption for situation-specific applications and when incorporated into sandwich panels, the performance of these structures can further be explored.
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Abdi, Frank, Cody Godines, Gregory N. Morscher, Sung Choi, Marc Villa Montero, Zipeng Han et Michael Presby. « Foreign Object Damage and Fatigue After Impact Simulations on Flat and Curved Hi Nicalon and Hi Nicalon Type S (MI SiC) Specimens at Room and 1200°C Using Building Block Approach ». Dans ASME Turbo Expo 2016 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-58086.
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SiC-based ceramic matrix composites (CMC) in turbine engine applications must sustain fatigue residual life after foreign object impacts that might occur in services. Experiments, nondestructive evaluations (NDE), and simulations have illustrated good correlations between impact energy and foreign object damage (FOD) and fatigue life after impact at room and 1200°C temperatures. Flat and curved five-harness satin (5HS) woven CMCs specimens, consisting of Hi-Nicalon Type S (Goodrich) and Hi-Nicalon (Rolls Royce) in MI SiC matrix, were tested and simulated. Tests measured electrical resistivity (ER), acoustic emission (AE), and microscopy. Simulations used a building block validation strategy and the Multi-Scale Progressive Failure Analysis (MS-PFA) method. Simulations complemented experiments in understanding and predicting the damage states, of impact, and fatigue residual strength after impact of CMCs to form a more complete understanding of the damage mechanisms involved in such events. The GENOA software developed by Alpha STAR Corporation [1, 2, 3] is capable of Durability and Damage Tolerance (D&DT), life, and reliability predictions by means of multi-scale progressive failure analysis (damage and fracture evolution). In general, CMCs are modeled using effective fiber, matrix, and interface constitutive behaviors, from which the lamina stiffness, strengths, and the strain rate effect can be derived. Similarly, the fatigue strength and stiffness degradation, and the effect of defects in a matrix micro crack density, voids, as well as fibers waviness, and damages after impact can be characterized. The final simulation is static loading and impact on a generic CMC SiC/SiC (Sylramic MI 5HS) blade which is to be used in future blade optimization based on minimizing damage incurred. The GENOA software platform supports FAA recommended ASTM standard Building-Block Validation Strategy with reduced tests conducting: 1) Material Calibration and Qualification, and 2) FEM Verification, Validation, and 3) Blind Predictions (Accreditation). The simulation and test comparisons performed included the damage size for both the CMC (fracture) and the steel impactor (plastic deformation), rebound velocities, SN curves for fatigue of pristine and impacted specimens at room and high temperatures. All simulations showed good correlation. The MS-PFA tool demonstrated a great potential for CMC post FOD fatigue life for part certification supported with reduced tests.
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Taherian, Shahab, Hamid Rahai, Jeremy Bonifacio, Samuel Lopez, Yong Lee, Behrouz Jafari et Thomas Waddington. « Computational Fluid Dynamics Validation of the Upper Respiratory System ». Dans ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70187.
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Verification of numerical results with experimental data is an important aspect of any in silico study. In the case of the upper respiratory system, the air flow is often turbulent, which highlights the importance of validating an accurate turbulence model for numerical simulations. Patient specific CT based upper airway models were used for computational fluid dynamics (CFD) analyses of the upper respiratory system and the results were compared with the corresponding experimental results. Detailed CFD simulations were conducted using the STAR-CCM+ software to investigate the most appropriate numerical approach in accurately predicting flow characteristics in the upper respiratory system. Large Eddy Simulations (LES) and Reynolds-Averaged Navier-Stokes (RANS) equations with k-ε, and k-ω turbulence models were investigated. The experiments include simulating inspiratory-expiratory flow with particle injection at the intake. A stereolithographic (SL) system (3-D system Projet 6000HD), with a resolution of 0.001–0.002 inches per inch of part and VisiJet SL Clear material, was used for fabricating the experimental model. The outlet of the model was connected to a manifold, with subsequent connection to a piston-cylinder system where a computer-controlled motor was used to simulate the normal breathing flow conditions. Investigations of flow characteristics within the upper airway were performed with a 2-D µPIV system from Intelligent Laser Applications (ILA for micro particle image velocimetry) which includes a high power green LED light source with an effective area of 100×100 mm, and a pulsing system (LPS controller). Matlab software was used for the post processing of PIV images. The LES results displayed more detailed transient flow characteristics than the RANS results for both turbulence models. At the early time steps, the numerical results of the average velocity from all three methods were nearly identical. However, further downstream, where obstructions and strong velocity gradients exist, results differ with a larger velocity gradient near the wall for the LES simulation. Comparing the numerical and experimental results, due to seeding limitations, the experimental results did not display detailed low speed flow characteristics and thus, the shear stress and turbulence quantities were less than the corresponding CFD results. Further experiments are currently in progress to improve the experimental results and to better assess the transient numerical and experimental results.
Rapports d'organisations sur le sujet "Micro Star Software (Firm)"
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Gallego, Juan Miguel, et Luis H. Gutiérrez. ICTs in Latin American and the Caribbean Firms : Stylized Facts, Programs and Policies : Knowledge Sharing Forum on Development Experiences : Comparative Experiences of Korea and Latin America and the Ca. Inter-American Development Bank, juillet 2015. http://dx.doi.org/10.18235/0007003.
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Adoption of information and communication technologies (ICTs) has been slow in Latin American and the Caribbean (LAC) countries and is not widespread. There is a digital divide between and within countries, including a digital gap in firms' adoption of ICTs. Large and medium-sized enterprises generally have access to the Internet, but adoption of advanced ICTs is low for all firms in these economies, and small and micro enterprises lag way behind. The backwardness in ICT adoption is exacerbated when only a small fraction of society has high connectivity broadband. Thus the digital infrastructure remains weak despite regional governments' promotion of a digital agenda. Bolder programs are needed. The success of public initiatives requires a competitive environment for internet and telecom service providers as well strong participation of the private sector and public-private partnerships. In particular, the engagement of large firms is necessary to increase ICTs diffusion in small and medium-sized enterprises (SMEs) that are part of their production chains. Additionally, coordination among different government agencies is critical for improving ICT policies design and implementation. The relevance of well-designed ICT policies is apparent in empirical and qualitative evidence from Chile, Colombia and Uruguay, where ICT investment indicates a positive impact on firm innovation and productivity. As part of what some call the digital ecosystem, the IT industry plays an important role, but we observe large heterogeneity in the LAC region. Brazil and Mexico are two big players with relatively well-developed software and hardware industries oriented to the domestic market, while Costa Rica and Uruguay emerge as IT producers and exporters. In between, medium-sized countries like Argentina, Colombia, Peru and Ecuador are looking for a position in either their internal or external markets. To increase performance in the IT industry and complement the existing ecosystem, ICT policies must be accompanied by industrial programs that go beyond the usual horizontal industrial policies.