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Embedding PV and WF Models into Steady State Studies by an Optimization Strategy  [PDF]
Juan Manuel Ramirez
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.23027
Abstract: Modeling of photovoltaic (PV) and wind farms (WF) stations to take into account these renewable energies into the power flow formulation are summarized. A strategy based on multi objective optimization in order to allocate PV and WF power into electrical power system is proposed. It is assumed that there are a reduced number of choices to allocate the stations. The algorithm is applied to the 39-bus test power system. The results show that the proposed algorithm is capable of optimal placement of renewable units.
Are Foreign and Public Investment Spending Productive in the Argentine Case? A Single Break Unit Root and Cointegration Analysis, 1960-2010.  [PDF]
Miguel D. Ramirez
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.36093
Abstract: This paper addresses the important question of whether public investment spending and inward foreign direct investment (FDI) flows enhance economic growth and labor productivity in Argentina. The paper estimates a dynamic labor productivity function for the 1960-2010 period that incorporates the impact of public and private investment spending, the labor force, and export growth. Single break (Zivot-Andrews) unit root and cointegration analysis suggest that (lagged) increases in public investment spending on economic and social infrastructure have a positive and significant effect on the rate of labor productivity growth. In addition, the model is estimated for a shorter period (1970-2010) to capture the impact of inward FDI flows. The estimates suggest that (lagged) inward FDI flows have a positive and significant impact on labor productivity growth, while increases in the labor force have a negative effect. From a policy standpoint, the findings call into question the politically expedient policy in many Latin American countries, including Argentina during the 1990s and early 2000s, of disproportionately reducing public capital expenditures to meet reducetions in the fiscal deficit as a proportion of GDP. The results give further support to progrowth policies designed to promote public investment spending and attract inward FDI flows.
Evaluation of Self-Treatment of Acne Using Silk’n Blue Phototherapy System  [PDF]
Judith Hellman, Cielo A. Ramirez
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2014, DOI: 10.4236/jcdsa.2014.43025

Background: At-home phototherapy devices for the treatment of acne have emerged as an appealing treatment option and as an effective adjunct treatment to existing modalities. The principal goal of the study was to determine the changes in the number of inflammatory lesions in acne patients. Methods: Patients received instruction for daily at-home use of Silk’n Blue device for 12 weeks. Follow-up visits were conducted at 1 and 3 months to collect data. Results: Fifteen subjects with mild to severe cases experienced improvement over the course of the trial. The decrease in mean inflammatory acne counts (from 41.26 to 24.46) and mean percent reduction (41.8%) were statistically significant (p < 0.001). Some participants experienced percent reductions as great as 67%. No adverse events were recorded. Conclusions: The Silk’n Blue device is a safe and effective modality for at-home treatment of mild, moderate, and severe inflammatory acne vulgaris with proper use.

Rebound of Region of Interest (RROI), a New Kernel-Based Algorithm for Video Object Tracking Applications  [PDF]
Andres Alarcon Ramirez, Mohamed Chouikha
Journal of Signal and Information Processing (JSIP) , 2014, DOI: 10.4236/jsip.2014.54012
Abstract: This paper presents a new kernel-based algorithm for video object tracking called rebound of region of interest (RROI). The novel algorithm uses a rectangle-shaped section as region of interest (ROI) to represent and track specific objects in videos. The proposed algorithm is constituted by two stages. The first stage seeks to determine the direction of the object’s motion by analyzing the changing regions around the object being tracked between two consecutive frames. Once the direction of the object’s motion has been predicted, it is initialized an iterative process that seeks to minimize a function of dissimilarity in order to find the location of the object being tracked in the next frame. The main advantage of the proposed algorithm is that, unlike existing kernel-based methods, it is immune to highly cluttered conditions. The results obtained by the proposed algorithm show that the tracking process was successfully carried out for a set of color videos with different challenging conditions such as occlusion, illumination changes, cluttered conditions, and object scale changes.
Promoting early breast cancer presentation in women after their final routine breast screening mammogram
A Ramirez
Breast Cancer Research , 2006, DOI: 10.1186/bcr1430
Abstract: The ultimate aim of the intervention is to reduce the proportion of older women with breast cancer who delay their presentation, and thereby save lives.
Promoting early presentation of breast cancer
AJ Ramirez
Breast Cancer Research , 2008, DOI: 10.1186/bcr2005
Abstract: Ideally an intervention to reduce delayed presentation of breast cancer would promote early help-seeking behaviour by patients at high risk of having cancer, but would not promote anxiety amongst people at low risk. It is important that patients should not be made unnecessarily anxious, and nor should general practitioners be overburdened with consultations with the worried well population. Based on the empirical evidence for the risk factors for patient delay and using effective behavioural change techniques, we have developed and are evaluating a psycho-educational intervention to promote early presentation of breast cancer by older women. We have focused our intervention on older women who are at greater risk of breast cancer and are also more likely to delay their presentation. The intervention is delivered by trained diagnostic radiographers at the point when the women leave the routine protection afforded by the National Health Service Breast Screening Programme and is in line with government recommended practice and complementary to the Breast Screening Programme. The ultimate aim of the intervention is to reduce the proportion of older women with breast cancer who delay their presentation, and thereby save lives.I will outline this work and other current initiatives within the United Kingdom to promote awareness and early presentation of breast cancer and how these might inform the development of policy initiatives to improve outcomes for patients within the National Health Service.
Redefining Firm Competencies, Innovation and Labour Mobility: A Case Study of R&D in British Telecom
Innovar , 2003,
Abstract: this paper is concerned with how labour market institutions and, more specifically, changing practices of labour mobility shape the manner in which established technology-intensive firms redefine their technological competencies. through a detailed case study undertaken in british telecom, the central argument posed is that the ability of firms to implement important strategic changes in r&d, involving changing firm structure and new forms of labour flexibility, will be strongly influenced by the employees’ own strategies of skill formation and career structure. this in turn is influenced by the specific manner in which the labour market institutions are defined and regulated. a framework is presented integrating the question of labour markets and innovation and specifies the distinctive input made by labour to the innovation process.
Temporal Overlap of Flowering Species with the Same Pollinating Agent Class: The Importance of Habitats and Life Forms
Nelson Ramirez
International Journal of Botany , 2005,
Abstract: One hundred and fifty five plant species were evaluated monthly in relation to flowering phenology, habitats and life forms in the Venezuelan Central Plain. Beetle and wind-pollinated species shown the largest levels of pollination overlapping and the lowest was found in bat-pollinated species. Intermediate values were associated to pollinating bees, flies, butterflies, moths, birds and wasps, respectively. The average values of pollination overlapping among the same or similar life form was larger than values among different life forms. The a-posteriori tests were significant among all average values of pollinating agent class overlap. For example, pollination overlapping within tree species was significantly lower than those values within herbaceous species. The average values of pollination overlap increased significantly from forest to disturbed area. The values of pollination overlapping within and among habitat exhibited the following tendency: overlapping values between forest and each one of the other habitats were the lowest ones. With the exception of forest, pollination overlapping between habitats and within each one of the habitats showed an increasing patterns from different to similar pair of habitats. Therefore, pollination overlapping could be attenuate by life form and habitat seasonality, in such way that plant species from the same life form in the same habitat have the highest values of pollination overlapping.
Fernando Ramirez
Revista Peruana de Epidemiologia , 2010,
Abstract: Objectives: To estimate the prevalence of depressive symptoms in teenagers senior students from a public college and to identify interpersonal relationship factors associated with it. Methods: Cross-sectional study. The sample was 176 students (15 to 19 years), the instrument consisted of two parts, the first one collected demographic data and the second one was the Reynolds Adolescent Depression Scale (RADS). We used SPSS.15.0, we calculated descriptive statistics such as frequency distributions and percentages; in order to assess the association of variables selected, chi-square was used and a logistic regression model was performed. Results: Of all students 28 (15.9%) were 15 years old, 125 (71.0%) were 16 and 23 (13.1%) 17. The prevalence of depression was 29.5%. Bivariate analysis of depression with sociodemographic characteristics showed that age, overtime study outside the classroom, history of sexual violence and school violence were statistically associated (p <0.05). In the logistic regression, history of school aggression (adjusted OR 4.5, IC95%: 2.0 -10.1), having 16 years (adjusted OR 3.6, IC95%: 1.4-9.1) and history of sexual assault (adjusted OR 2.6, 95% CI: 1.1-7.0) were associated to the presence of depressive symptoms in the adolescence. Conclusions: History of school aggression and history of sexual aggression are interpersonal relationship factors associated with a higher risk of depressive symptoms in a teenager. Early identification of these risk factors will help reduce the impact of this disease in the family, society and the academic performance; it would also contribute to the reduction of the suicide risk, substance abuse, and persistence of depressive disorders in adulthood.
A Story to Tell
Marisa Ramirez
Journal of Librarianship and Scholarly Communication , 2012,
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