Felix Gutierrez

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The global bandwidth shortage facing wireless carriers has motivated the exploration of the underutilized millimeter wave (mm-wave) frequency spectrum for future broadband cellular communication networks. There is, however, little knowledge about cellular mm-wave propagation in densely populated indoor and outdoor environments. Obtaining this information is(More)
| This tutorial presents an overview of the technological advances in millimeter-wave (mm-wave) circuit components, antennas, and propagation that will soon allow 60-GHz transceivers to provide multigigabit per second (multiGb/s) wireless communication data transfers in the consumer marketplace. Our goal is to help engineers understand the convergence of(More)
OBJECTIVES To determine the population-based incidence of community-acquired pneumonia (CAP) in adults and to assess the relative importance of age and gender on the incidence of infections caused by different microbial pathogens. METHODS A two-year prospective study in a well-defined geographic area of the Spanish Mediterranean coast. RESULTS The(More)
BACKGROUND Dolutegravir (S/GSK1349572), a once-daily, unboosted integrase inhibitor, was recently approved in the United States for the treatment of human immunodeficiency virus type 1 (HIV-1) infection in combination with other antiretroviral agents. Dolutegravir, in combination with abacavir-lamivudine, may provide a simplified regimen. METHODS We(More)
The millimeter wave frequency spectrum offers unprecedented bandwidths for future broadband cellular networks. This paper presents the world’s first empirical measurements for 28 GHz outdoor cellular propagation in New York City. Measurements were made in Manhattan for three different base station locations and 75 receiver locations over distances up to 500(More)
BACKGROUND Data on long-term central nervous system (CNS) toxicity associated with efavirenz therapy are scarce, and risk factors remain largely unknown. We aimed to determine whether monitoring the plasma concentration of efavirenz could predict neuropsychiatric adverse events associated with long-term therapy with efavirenz. METHODS We performed a(More)
STUDY OBJECTIVES To evaluate the usefulness of procalcitonin serum levels as a predictor of etiology and prognosis in adult patients with community-acquired pneumonia (CAP) when they are stratified according to severity. DESIGN One-year, population-based, prospective study. SETTING University teaching hospital. PATIENTS All adult patients who received(More)
BACKGROUND HIV-1 co-receptor usage may play a critical role in AIDS pathogenesis. Information on viral tropism in HIV-1 seroconverters is scarce, as is the relationship with transmission of drug-resistant viruses. METHODS All consecutive HIV-1 seroconverters seen between January 1997 and December 2005 in 17 Spanish hospitals were retrospectively analysed.(More)
BACKGROUND Data comparing abacavir/lamivudine versus tenofovir/emtricitabine in antiretroviral-naive patients are controversial. We compared 48-week efficacy and safety of these combinations as substitutes of nucleosides in patients with virological suppression. METHODS We randomly assigned 333 HIV-1-infected patients on lamivudine-containing triple(More)
BACKGROUND Human immunodeficiency virus type 1 (HIV-1), hepatitis B virus (HBV), human T-cell lymphotropic virus type 1 (HTLV-1) and Treponema pallidum represent major public health problems in sub-Saharan countries. These infections can be transmitted from mother to children and may cause severe morbidities in their offspring. Ethiopia is among the(More)