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Search Results: 1 - 10 of 4809 matches for " Laurent Jenni "
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Collision Avoidance in Next-generation Fiber Positioner Robotic System for Large Survey Spectrograph
Laleh Makarem,Jean-Paul Kneib,Denis Gillet,Hannes Bleuler,Mohamed Bouri,Laurent Jenni,Francisco Prada,Justo Sanchez
Physics , 2013, DOI: 10.1051/0004-6361/201323202
Abstract: Some of the next generation massive spectroscopic survey projects, such as DESI and PFS, plan to use thousands of fiber positioner robots packed at a focal plane to quickly move in parallel the fiber-ends from the previous to the next target points. The most direct trajectories are prone to collision that could damage the robots and impact the survey operation. We thus present here a motion planning method based on a novel decentralized navigation function for collision-free coordination of fiber positioners. The navigation function takes into account the configuration of positioners as well as the actuator constraints. We provide details for the proof of convergence and collision avoidance. Decentralization results in linear complexity for the motion planning as well as dependency of motion duration with respect to the number of positioners. Therefore the coordination method is scalable for large-scale spectrograph robots. The short in-motion duration of positioner robots (~2.5 seconds using typical actuator constraints), will thus allow the time dedicated for observation to be maximized.
A Tale of Two Hormones: Role of Leptin and Insulin in Hippocampal Synaptic Function
Jenni Harvey
The Open Neuroscience Journal , 2007, DOI: 10.2174/1874082000701010001]
Abstract: It is well documented that the endocrine hormones, leptin and insulin provide signals to specific hypothalamic brain regions to regulate energy balance. However, the past decade of research has not only revealed the widespread expression of insulin and leptin receptors in the CNS, but has also identified numerous additional functions of these hormones in the brain. In particular, there is growing evidence that these hormones markedly influence hippocampal excitatory synaptic transmission as well as hippocampal synaptic plasticity. More recent studies have also identified links between dysregulation of leptin and insulin systems and the development of neurodegenerative disorders such as Alzheimer s disease. Here we review the recent evidence supporting a role for these hormones in modulating hippocampal synaptic function in health and disease.
In control and out of control. The discourse on intoxication among young Finnish women in the 1980s and 2000s
Jenni Simonen
Nordic Studies on Alcohol and Drugs , 2011, DOI: 10.2478/v10199-011-0014-3
Abstract: AIMS - The article focuses on the discourse on intoxication and its changes among young women in Finland. According to surveys, drinking among Finnish women has been rising for decades. Especially young women have been in the front line in the raise of drinking and intoxication-oriented drinking. However, statistics are not able to explain the factors behind this change. What has happened to women's attitudes and connotations related to binge drinking during the past decades? How do young women in their twenties perceive being drunk and how has the description of their relationship to this condition changed over the last 20 years? METHODS AND DATA - To explore these questions, the present article compares interview materials concerning drinking collected among young adults in 1985 and 2005/2007. The article analyses how young women identify themselves with intoxication in these periods and how the way in which women describe this relationship has changed in the meantime. RESULTS - The greatest change has to do with how young women regard drunkenness while presenting themselves. Whereas in the 1985 material young women distanced themselves from binge drinking, 20 years later they identify themselves strongly with it. The analysis shows that this development illustrares that both the significance of drunkenness in itself and the way in which drinking-related self-expression has changed. CONCLUSIONS - The results relate to the changes in Finnish drinking culture which have been more pronounced in the case of women than men as well as the change of acceptable and desirable images of femininity.
Online appropriations: collaborative technologies, digital texts, and Shakespeare’s authority
Jenni Ramone
Authorship , 2011,
Abstract: This article considers the impact of digital technologies on Shakespeare's status as author. Digital technology encourages a more democratic engagement with literature which privileges the reader and thereby moderates the author's powerful hold over their text. As a result, it is to be expected that with the increased availability of digital tools, Shakespeare's status and conventional, universalist readings of his works might decline. Technologies have the potential to open up Shakespeare's works to new kinds of readers: these include academics studying Shakespeare's works perspectives outside the traditional disciplines of literary and performance studies, but also the general public who appropriate Shakespeare when shaping their online identities, or contribute to digital repositories of Shakespeare references. My paper considers the contradiction that while, in theory, digital technologies invite the reader to wrest control from the author, in practice those tools are sometimes used to bolster Shakespeare's universal value and genius. I consider the ultimate effect on Shakespeare's author status when digital technologies are applied to his works, and suggest that one way to measure this might be to explore appropriations of Shakespeare's characters online by individual internet users.
Welcome to the revolution: The sensory turn and art history
Jenni Lauwrens
Journal of Art Historiography , 2012,
Abstract: Discourses concerned with the sensorially embodied subject have emerged since the 1990s in various disciplines including history, anthropology, sociology, geography, film studies and literary studies. The purpose of this article is to bring the conversation regarding audiences’ embodied engagement in culture closer to art history by investigating the implications of what has been termed the sensory turn for this discipline. One of the accusations lodged against art history by supporters of the multi-sensoriality of embodied human experience is its alleged ocularcentrism, the implication of which is a detached autonomous subject. In this article, the sensory turn is defined and contextualized, particularly in light of the body of criticism targeted at art history’s emphasis on the visual. The proposed ways in which art historians might usefully deal with audience’s embodied experiences of not only immersive installation works of art, but also artworks in traditional media, such as painting and photography, are teased apart.
In Search of Medieval Disability: Lectio praecursoria 16.2.2013
Jenni Kuuliala
J@rgonia , 2013,
ATLAS construction status
Jenni P.
Brazilian Journal of Physics , 2006,
Leptin regulation of neuronal morphology and hippocampal synaptic function
Jenni Harvey
Frontiers in Synaptic Neuroscience , 2013, DOI: 10.3389/fnsyn.2013.00003
Abstract: The central actions of the hormone leptin in regulating energy homeostasis via the hypothalamus are well documented. However, evidence is growing that this hormone can also modify the structure and function of synapses throughout the CNS. The hippocampus is a region of the forebrain that plays a crucial role in associative learning and memory and is an area also highly vulnerable to neurodegenerative processes. Recent studies indicate that leptin is a potential cognitive enhancer as it modulates the cellular processes underlying hippocampal-dependent learning and memory including dendritic morphology, glutamate receptor trafficking and activity-dependent synaptic plasticity. Here, we review the recent evidence implicating the hormone leptin as a key regulator of hippocampal synaptic function and discuss the role of leptin receptor-driven lipid signaling pathways involved in this process.
Transformation of Local Leadership— Narratives on changed Interaction  [PDF]
Arto Haveri, Jenni Airaksinen, Henna Paananen
Open Journal of Leadership (OJL) , 2015, DOI: 10.4236/ojl.2015.44011
Abstract: This article investigates the transformation of local government leadership as a change in interaction. Traditional interaction patterns are challenged by the increasing complexity of governance relations. The empirical analysis is based on biographical narratives of very experienced (born in 1945-1950) Finnish municipal chief executive officers. The narratives form a rich set of interpretations about the changes that have occurred in the role of municipalities during the last four decades. According to the narratives, both the quantity and quality of interaction have changed markedly: interaction is needed at numerous surfaces, but the quality of interaction is undergoing alteration. The current trend of instant interaction requires more situational awareness, social skills and quicker responses.
Predictors of Appropriate ICD Therapy in Patients with Arrhythmogenic Right Ventricular Cardiomyopathy: Long Term Experience of a Tertiary Care Center
Pia K. Schuler, Laurent M. Haegeli, Ardan M. Saguner, Thomas Wolber, Felix C. Tanner, Rolf Jenni, Natascia Corti, Thomas F. Lüscher, Corinna Brunckhorst, Firat Duru
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0039584
Abstract: Introduction Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a rare genetically transmitted disease prone to ventricular arrhythmias. We therefore investigated the clinical, echocardiographical and electrophysiological predictors of appropriate implantable cardioverter defibrillator (ICD) therapy in patients with ARVC. Methods A retrospective analysis was performed in 26 patients (median age of 40 years at diagnosis, 21 males and 5 females) with ARVC who underwent ICD implantation. Results Over a median (range) follow-up period of 10 (2.7, 37) years, appropriate ICD therapy for ventricular arrhythmias was documented in 12 (46%) out of 26 patients. In all patients with appropriate ICD therapy the ICD was originally inserted for secondary prevention. Median time from ICD implantation to ICD therapy was 9 months (range 3.6, 54 months). History of heart failure was a significant predictor of appropriate ICD therapy (p = 0.033). Left ventricular disease involvement (p = 0.059) and age at implantation (p = 0.063) were borderline significant predictors. Patients with syncope at time of diagnosis were significantly less likely to receive ICD therapy (p = 0.02). Invasive electrophysiological testing was not significantly associated with appropriate ICD therapy. Conclusion In our cohort of patients with ARVC, history of heart failure was a significant predictor of appropriate ICD therapy, whereas left ventricular involvement and age at time of ICD implantation were of borderline significance. These predictors should be tested in larger prospective cohorts to optimize ICD therapy in this rare cardiomyopathy.
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