Correa G.O.,LNCC |
European Control Conference, ECC 1999 - Conference Proceedings | Year: 2015
In this paper, the H2/H∞ problem is considered in a transfer-function setting, i.e., without a priori chosen bounds on controller order. A descent procedure is described which is based on an explicit parametrization of all feasible and descent directions stemming from a given point on the boundary of the feasible transfer-function set. A search direction at each such point can be obtained as the solution of a convex finite-dimensional problem which can be converted into a LMI problem. The procedure in question keeps generating feasible points with decreasing cost values unless the global optimal is attained. © 1999 EUCA.
De Marco F.J.,IME |
Martins N.,CEPEL - Center of Pesquisas de Energia Eletrica |
IEEE Transactions on Power Systems | Year: 2013
This paper describes a computational technique for the phase shaping of the power system stabilizer in a power plant thatwill improve its contribution to the satisfactory damping of the generator rotor oscillations over the entire electromechanical frequency range: from the intraplant to the interarea modes. To this end, the method utilizes a synthetic system as test bench, in which the external system characteristic seen from the generator terminals is automatically changed, with a wide and coordinated variation in its parameters, to produce a sequence of electromechanical modes similar to those experienced by the generator and associated controllers when connected to a large multimachine power system. © 2012 IEEE.
News Article | January 27, 2016
The United Kingdom is walking into an energy crisis it may not be ready to face, according to industry experts. The Institute of Mechanical Engineers (IME) has warned that the UK Government’s policy to close all coal-fired power stations by 2025, in combination with the retirement of the majority of the nation’s ageing nuclear fleet and growing electricity demand will leave the country facing a 40-55% electricity supply gap. Responding in tandem with the IME, the UK’s Renewable Energy Association (REA) has warned that current Government policies are cutting off one of the only ways such an electricity supply gap could be closed — namely, renewable energy in combination with energy storage. A new report from the Institute of Mechanical Engineers has found that the current plan to plug the looming electricity supply gap with Combined Cycle Gas Turbine (CCGT) plants are unrealistic — requiring approximately 30 new CCGT plants within 10 years, compared to only 4 being built in the past 10 years. The significant reduction in existing nuclear and coal-fired power plants may be politically and environmentally beneficial, but the current in-place “solutions” don’t hold up to closer scrutiny. Additionally, the report, Engineering the UK Electricity Gap, claims that “a greater reliance on interconnectors to import electricity from Europe and Scandinavia is likely to lead to higher electricity costs and less energy security.” “The UK is facing an electricity supply crisis,” said Dr Jenifer Baxter, Head of Energy and Environment at the Institution of Mechanical Engineers, and Lead Author of the report. “As the UK population rises and with the greater use of electricity use in transport and heating it looks almost certain that electricity demand is going to rise.” “However with little or no focus on reducing electricity demand, the retirement of the majority of the country’s ageing nuclear fleet, recent proposals to phase out coal-fired power by 2025, and the cut in renewable energy subsidies, the UK is on course to produce even less electricity than it does at the moment.” “Currently there are insufficient incentives for companies to invest in any sort of electricity infrastructure or innovation and worryingly even the Government’s own energy calculator does not allow for the scenarios that new energy policy points towards. Under current policy, it is almost impossible for UK electricity demand to be met by 2025.” At the same time, the Renewable Energy Association have weighed in on the discussion, warning that 2016 may result in “being the year where the government subsidises nuclear, gas, and diesel but stifles the most cost-effective renewables such as solar, biomass, and wind.” “This crisis is the clear product of a lack of vision in energy policy,” said James Court, Head of Policy and External Affairs at the Renewable Energy Association. “Technologies are here now that can supply this country’s power needs in a low-carbon, low cost way and can be rapidly deployed, including solar PV, wind, and energy storage.” Specifically, a report published last week by the REA in conjunction with professional services company KPMG, outlined how the decrease in energy storage costs have made the technology economic in many situations at grid scale right now, and stated that by 2017 they will be economic in tandem with solar PV. Such a decentralized energy system will, according to James Court, “lower costs to consumers and increase” the country’s energy security. Get CleanTechnica’s 1st (completely free) electric car report → “Electric Cars: What Early Adopters & First Followers Want.” Come attend CleanTechnica’s 1st “Cleantech Revolution Tour” event → in Berlin, Germany, April 9–10. Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.
Miami is a city of many traits. Historically recognized for the sun, beach and tourists of South Beach, it has now become much more than that. With one of the most diverse populations in the country, Miami is the strategic capital of the Americas, binding Brazil and Spanish-speaking Latin America (LatAm) to the U.S. market. Miami is now the second most entrepreneurial city in the U.S., with the highest startup density in the country at 247.6 startups per 100,000 people, according to the Kauffman Index. Its privileged proximity to both New York and Silicon Valley will allow this emerging ecosystem to consolidate its position as an entrepreneurial hub with the arrival of accelerators and VC funds. Rather than trying to be the next Silicon Valley, Miami is following the lead of emerging tech hubs like Austin and Boulder, and is focusing on its strengths. Miami and tech have been having an on-again, off-again relationship since the 1990s, when it hosted some of the top media and financial firms from South America. One of the most iconic companies of that era was Patagon.com, a Miami transplant from Argentina that sold 85 percent to Santander for $585 million. It also served as a springboard to some of the pioneers in the Miami tech scene today, such as Juan Pablo Cappello, Constancio Larguia, Silvina Moschini and Peter Kellner, co-founder of Endeavor. A lot has changed since those days. A new Miami tech scene came about seven years ago when “some of today’s most relevant players started forming and getting together,” as The Miami Herald’s Nancy Dhalberg put it. Florida International University hosted its first Americas Venture Capital Conference (2010), Susan Amat co-founded The Launch Pad at University of Miami (2008) and soon after she started Venture Hive, Miami’s most iconic incubator. But is was in 2012 when, inspired by Dave McClure’s Geeks on a Plane stop in the city, The John S. and James L. Knight Foundation decided Miami had a great shot at becoming a startup capital. Since then, the foundation started accelerating and funding different local initiatives, bringing new players to the scene and becoming instrumental in Endeavor, Venture for America, LaunchCode, Emerge, IME, The Idea Center, The LAB and 500 Startups, among others, landing in the city. The most recent grantee is PowerMoves, an initiative to raise the number of venture-backed founders of color and minorities. This particular organization well-represents the foundation’s spirit. In the words of Matt Haggman, program director at the Knight Foundation, “Diversity is our differentiator; unlock talent and amplify capital.” Matt has become the city’s superman, getting involved in most activities within the current communities; he could easily run for mayor any day. Through his work, the foundation has committed more than $20 million in funding across 165 entrepreneurship initiatives in the Miami area during the last three years. Just as FIU’s VC conference stopped, Manny Medina started cooking his annual eMerge Americas conference, where folks such as Jim McKelvey, co-founder of Square, have inspired thousands of people. It was around that time when Miami’s reputation as the capital of South America got back into play as a differentiator and people started to believe a startup culture could be created by developing the community. Entrepreneurs Demian Bellumio and Ola Ahlvarsson have also found a way to connect tech with art, another one of Miami traits. For three years now they have been producing SIME — the European conference — in the city around Art Basel Week, merging art, technology and media. The opportunity has not only become obvious for entrepreneurs, but is also increasingly notorious for big companies that still make Miami their LatAm headquarters. Several companies are landing every week as Miami regains the title as a regional hub, and also as one of the most important platforms to serve the growing Hispanic power in the U.S. Companies such as Google, Twitter, Facebook, Uber, Lyft and Vice have moved to Miami, along with new investors hungry for this opportunity. “Miami is the perfect place to start or grow your business, specially if you are interested in an international venture,” said Laura González-Estéfani, Director of Partnerships & Mobile LatAm for Facebook based in Miami. González-Estéfani recognizes Miami as a hub for the Americas and Europe because the tech community is hungry for making new things happen. “There is talent, there is support from the institutions and private initiatives that are focused on boosting innovation, and there is an incremental interest from VCs and business angels for innovative projects.” There are currently 139 startups and companies on the Inc. 5000 list that are based in the Miami metro area, doing everything from media to tourism to health tech. Another great incentive for firms coming to the city has to do with Miami’s tax advantages where there are no local or state income taxes, and Florida’s corporate tax is 5.5 percent, one of the nation’s lowest. As made famous by Steve Jobs, the dots can usually be connected looking backwards, and Miami is no exception. The last few years have kept the local ecosystem busy with the starting of many initiatives. Angel investors got organized and created groups educating an increasing the number of local investors in tech, co-working spaces popped up in every district — such as the recently opened Building.co by the succesful .CO crew — and coding schools started taking over the city. Universities are now teaching entrepreneurship, VC funds are coming from outside the city and soon we’ll see accelerators arrive as Miami’s number of startups soars — up 46 percent — accounting for 1,600 companies (according to the Kauffman Foundation). AGP Miami, the largest local angel group, is proof of how rapid change is happening in the city; it has quadrupled the number of its members, up to 80 investors, in the past two years. The group has invested in 14 firms, for a total of $2.8 million, and is actively looking to increase that number with both companies from Miami and those attracted to the city. “Miami does not have a capital problem: We need family offices to trust new funds to leverage the power of Miami as a gateway. That is a tremendous opportunity,” said Nicolas Berardi, AGP Miami’s managing director. One of the newcomers is European accelerator Startupbootcamp. Looking to benefit from Miami’s top positioning as a healthcare and talent hub will bring 10 companies a year to Miami for the next three years, and support them with its six-month acceleration program. Christian Seale, Startupbootcamp Miami founder and managing director, believes Miami can become a global center for healthcare innovation. “Miami is the second largest healthcare hub in the U.S., with 8 hospitals, over 33,000 beds, three globally recognized research universities and a legacy of successful healthcare companies,” said Seale. Many of these dots — not to say all — have a strong debt to the Knight Foundation’s efforts. But bigger questions now arise on how to make this a sustainable ecosystem. Knight is still very much needed, but hopefully current players will get together in a joint effort to connect the dots and build a stronger and bigger community. As the city consolidates its place as one of the hottest entrepreneurial spots in the country, Miami has become a strategic market for one of the most valuable startups in the world, Magic Leap, and others, such as CareCloud, Open English and more. Altogether, these Miami royals have so far raised more than $763 million in venture capital, attracting talent and gaining attention from international investors. In less than two years, LaunchCode, the non-profit organization from St. Louis, Missouri that received $1.2 million funding from Knight in 2014 for its first expansion city, has teamed up with more than 120 companies to hire through The Idea Center tech apprentices who don’t necessarily have a traditional degree. As for Magic Leap, the virtual reality startup that raised $542 million in venture capital from Google and Qualcomm, among other tech giants, has chosen to relocate its headquarters to the Design Center of The Americas (DCOTA) in Dania Beach, Florida. “Magic Leap’s move to DCOTA is an investment in the future, ensuring that we have the very best creative environment and resources to support our rapidly growing team,” said Russell Burke, Chief Financial Officer at Magic Leap, in a press release. “It’s also a pretty big statement about where we think we will be in the months and years ahead.” Another example of Miami’s thriving startup ecosystem is Andres Moreno and Wilmer Sarmiento’s Open English. The company raised $120.25 million in venture capital, and took advantage of Miami’s strategic position to launch an online English-learning business that serves more than 400,000 students in Latin America and the Spanish-speaking community within the U.S. While Miami’s royals provide proof of success and business opportunities for startups and investors in South Florida, venture capital remains a weak link in the ecosystem. In 2014, the Miami metro area attracted $656.83 million of the $867.6 million in 36 venture capital deals that took place in Florida. These figures pale in comparison to venture capital investments drawn by the states of California, with $26,840.6 million (San Francisco accounted for $10,948 million) or New York, with $4,510.9 million, with 1,631 and 422 deals, respectively (according to data from CB Insights). Yes, it is still early, and there’s more to come. A lot of it is going to come from attracting talent from outside Miami, and, honestly, it doesn’t seem to be a hard task. Miami is a great launching pad if you are interested in selling to LatAm or tapping into the U.S. market, with a privileged positioning to cater to U.S. Hispanics. The quality of life is great, it’s strategically close to Europe, LatAm, New York and San Francisco, the infrastructure is starting to be in place and the ecosystem is growing fast. Institutional venture capital funds have yet to look at Miami with better eyes — but honestly, who would have expected for them to arrive before the opportunities? This is already changing. 500 Startups has done a program in Miami, investing up to $250,000 in eight companies, and Scout Ventures established an office in Miami and made two investments. Prominent angel investors Patrick McKenna and Mark Kingdon have moved to the area, and local funds are starting to emerge, such as Z9 actively looking for companies. The landing of Startupbootcamp’s accelerator is also encouraging, and will certainly pave the way for more accelerators to come. Whoever has tried surfing at any point in their lives know something very well: There is, indeed, a right time to catch a good wave. It is certainly not at its peak; rather, it takes a bit of paddling and vision to catch the best waves and enjoy the ride.
Selection of communication technologies in the Brazilian Army using AHP, TODIM and Sapiens software [Seleção De Tecnologias De Comunicações No Exército Brasileiro Utilizando Os Métodos Multicritério De Análise Hierárquica, TODIM E Software Sapiens]
Ribeiro L.S.,IME |
Passos A.C.,IME |
Teixeira M.G.,Federal University of Rio de Janeiro
Producao | Year: 2012
The communication networks in the Brazilian Army have special characteristics. A tactical system of communication should have a unique logical structure integrating multiple technologies. These logical structures for tactical activities are named, in Brazil, Combat Radio Subsystem and Data Radio Subsystem - each one with its specific purposes. There are some alternatives regarding the combat manuals requirements. This paper developed a multi-criteria ranking case study where the main matter was to choose the best technology for each subsystem. Two methodologies were employed: Analytic Hierarchy Process (AHP) and TODIM. A decision support software (based on TODIM) called Sapiens was used to implement the results for this method. The main objective of this paper was to build a framework for this kind of ranking problem.