SSthreshless Start: A Sender-Side TCP Intelligence for Long Fat Network

Measurement shows that 85% of TCP flows in the internet are short-lived flows that stay most of their operation in the TCP startup phase. However, many previous studies indicate that the traditional TCP Slow Start algorithm does not perform well, especially in long fat networks. Two obvious problems are known to impact the Slow Start performance, which are the blind initial setting of the Slow Start threshold and the aggressive increase of the probing rate during the startup phase regardless of the buffer sizes along the path. Current efforts focusing on tuning the Slow Start threshold and/or probing rate during the startup phase have not been considered very effective, which has prompted an investigation with a different approach. In this paper, we present a novel TCP startup method, called threshold-less slow start or SSthreshless Start, which does not need the Slow Start threshold to operate. Instead, SSthreshless Start uses the backlog status at bottleneck buffer to adaptively adjust probing rate which allows better seizing of the available bandwidth. Comparing to the traditional and other major modified startup methods, our simulation results show that SSthreshless Start achieves significant performance improvement during the startup phase. Moreover, SSthreshless Start scales well with a wide range of buffer size, propagation delay and network bandwidth. Besides, it shows excellent friendliness when operating simultaneously with the currently popular TCP NewReno connections.Comment: 25 pages, 10 figures, 7 table

Give Me Your Entrepreneurs, Your Innovators: Estimating the Employment Impact of a Startup Visa

The idea of visas for immigrant entrepreneurs has bounced around the country for many years, and even has been introduced into Congress on more than one occasion. The most recent is Startup Act 3.0, a bipartisan bill recently introduced into the U.S. Senate that, among other things, includes a Startup Visa. In this current incarnation, the new Startup Visa would make available a fixed pot of 75,000 visas for individuals who start companies. Initial eligibility would be restricted to individuals who already are in the United States on either H-1B visas or F-1 student visas. Once the Startup Visa is issued, further requirements are imposed in the first year. During that time, the entrepreneur must register a business, employ at least two full-time, non-family employees, and invest or raise an investment of at least $100,000. If, after one year, those requirements are met, the entrepreneur gets three additional years on the visa. During that three-year period, the entrepreneur must employ at least five full-time, non-family employees. The original two employees count toward these five, which means the business essentially must hire one person per year after the first year of operation. At the end of three years, the entrepreneur may apply to have the conditional status removed.This report attempts to estimate the impact on job creation that enactment of such a Startup Visa would have. Calculations suggest that a Startup Visa could create anywhere from 500,000 to 1.6 million jobs over the next ten years. Because of the assumptions and methods used, these estimates are considered very conservative, low-end estimates

The Kauffman Index: Startup Activity National Trends - 2016

This report provides a broad index measure of business startup activity in the United States. It is an equally weighted index of three normalized measures of startup activity:The Rate of New Entrepreneurs in the economy, calculated as the percentage of adults becoming entrepreneurs in a given month.The Opportunity Share of New Entrepreneurs, calculated as the percentage of new entrepreneurs driven primarily by "opportunity" vs. "necessity."The Startup Density of a region, measured as the number of new employer businesses normalized by total business population

Beyond Metropolitan Startup Rates: Regional Factors Associated with Startup Growth

Understanding what fosters -- and hinders -- firm formation and growth at the metropolitan level across the United States is a challenge. Entrepreneurship can be measured by a variety of indicators, and they each can tell somewhat different stories. Furthermore, because entrepreneurship can refer to the growth of firms from a startup stage to mid- or large-scale, no one dataset covers the full range of companies that fall in this category. This report contributes to the Kauffman Foundation's recent series of analyses on the rate of business creation in metropolitan areas. Going beyond identifying metropolitan areas with higher rates of entrepreneurship, we analyze what regional factors are associated, or unassociated, with entrepreneurial activity. Understanding what drives entrepreneurship at the regional level -- especially high-growth business creation -- will help policymakers and entrepreneurship supporters know where to invest their efforts

Startup of a reactive distillation process with a decanter

The startup of a reactive distillation process for the production of propyl acetate including a decanter is studied. A simulation model is presented which describes the whole startup from a cold and empty state and takes into account the liquid phase split in the decanter. The simulation model is successfully validated with own dynamic experimental data. Different startup strategies are developed and analysed in simulation studies showing the high influence of the initial charging of decanter and reboiler on the startup time

Make Your Job Summer Program: A Report to the Network for Teaching Entrepreneurship

Make Your Job Summer Program condenses the material in NFTE's year-long high school curriculum into an intensive two-week course. Over the course of these two weeks, from 9-5 pm each day, students learn about businesses and entrepreneurship while simultaneously designing their business plans. At the end of the program, students present their business plans to a panel of judges to compete for seed money. At two of the 18 sites, NFTE also offered an 8- 10 week version of the program called Startup Summer. Startup Summer is for students who already participated in NFTE during the school year and takes the program a step further by helping them execute their business plans. Students in Startup Summer continue to receive support in launching their businesses into the school year. 378 students participated in the BizCamps and 77 participated in Startup Summer (at the Los Angeles and New York City sites). Although some sites had run NFTE-related summer programs in prior years, other sites were running the summer program for the first time. Two of these BizCamps (Girl Empower BizCamps) served female students exclusively.Our research examines both the impact and implementation of the program and considers:- the types of students who enrolled in the program and why;- how the students experienced the program;- the perceived match between program design and student backgrounds and abilities;- how staff understood the goals and expectations of the program;- the capacities and resources that supported implementation;- the challenges experienced in delivering the program; and- how the program was adapted across sites

Immigrants and Billion Dollar Startups

Immigrants play a key role in creating new, fast-growing companies, as evidenced by the prevalence of foreignborn founders and key personnel in the nation's leading privately-held companies. Immigrants have started more than half (44 of 87) of America's startup companies valued at $1 billion dollars or more and are key members of management or product development teams in over 70 percent (62 of 87) of these companies. The research finds that among the billion dollar startup companies, immigrant founders have created an average of approximately 760 jobs per company in the United States. The collective value of the 44 immigrant-founded companies is$168 billion, which is close to half the value of the stock markets of Russia or Mexico.The research involved conducting interviews and gathering information on the 87 U.S. startup companies valued at over $1 billion (as of January 1, 2016) that have yet to become publicly traded on the U.S. stock market and are tracked by The Wall Street Journal and Dow Jones VentureSource. The companies, all privately-held and with the potential to become publicly traded on the stock market, are today each valued at$1 billion or more and have received venture capital (equity) financing