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RISS 인기검색어
- 검색키워드
- 저자 : Hilt, V (검색결과 5 건)
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Occurrence of Cognitive and Neurological Symptoms in Norwegian Dentists
Hilt, Bjorn,Svendsen, Kristin,Syversen, Tore,Aas, Oddfrid,Qvenild, Torgunn Occupational Safety and Health Research Institute 2011 Safety and health at work Vol.2 No.2
Objectives: Previous investigations have presented some evidence of late cognitive effects in dental personnel exposed to metallic mercury. We wanted to examine if Norwegian dentists have an increased prevalence of symptoms consistent with neurological and/or cognitive malfunction. Methods: The study group consisted of 406 dentists from central Norway and 217 controls from the general population, all under the age of 70. They had responded to a standardised postal questionnaire (Euroquest) inquiring about seven symptoms in regard to neurology, psychosomatics, memory, concentration, mood, sleep disturbances, and fatigue. A score was calculated for each symptom based on 4 to 15 single questions scored on a scale from 1 (seldom or never) to 4 (very often). Results: The dentists and controls had a participation rate of 57.2 % and 42.9 % respectively. The dentists reported no more cognitive symptoms than the controls, with low average symptom scores from 1.16 for neurological symptoms in males to 1.73 for fatigue in females. Corresponding figures for the controls were 1.22 and 1.77. There were a total of 1.2 % of the dentists and 1.8 % of the controls who reported having three or more of the seven symptoms "often" or more frequently. Conclusion: Norwegian dentists do not report more cognitive and neurological symptoms than controls from the general population.
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High-Throughput Open-Air Plasma Activation of Metal-Oxide Thin Films with Low Thermal Budget
Tak, Young Jun,Hilt, Florian,Keene, Scott,Kim, Won-Gi,Dauskardt, Reinhold H.,Salleo, Alberto,Kim, Hyun Jae American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.43
<P>Sputter-processed oxide films are typically annealed at high temperature (activation process) to achieve stable electrical characteristics through the formation of strong metal-oxide chemical bonds. For instance, indium-gallium-zinc oxide (IGZO) films typically need a thermal treatment at 300 °C for ≥1 h as an activation process. We propose an open-air plasma treatment (OPT) to rapidly and effectively activate sputter-processed IGZO films. The OPT effectively induces metal-oxide chemical bonds in IGZO films at temperatures as low as 240 °C, with a dwell time on the order of a second. Furthermore, by controlling the plasma-processing conditions (scan speed, distance <I>a</I> between plasma nozzle and samples, and gas flow rate), the electrical characteristics and the microstructure of the IGZO films can be easily tuned. Finally, OPT can be utilized to implement a selective activation process. Plasma-treated IGZO thin-film transistors (TFTs) exhibit comparable electrical characteristics to those of conventionally thermal treated IGZO TFTs. Through in-depth optical, chemical, and physical characterizations, we confirm that OPT simultaneously dissociates weak chemical bonds by UV radiation and ion bombardment and re-establishes the metal-oxide network by radical reaction and OPT-induced heat.</P> [FIG OMISSION]</BR>
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Nonfatal Occupational Injuries in Norwegian Farmers
Svendsen, Kristin,Aas, Oddfrid,Hilt, Bjorn Occupational Safety and Health Research Institute 2014 Safety and health at work Vol.5 No.3
Background: Agriculture ranks among the most dangerous trades worldwide. There is, however, still a lack of knowledge on nonfatal injuries in agriculture. The aim of this study was to describe the nature and occurrence of nonfatal injuries in farmers in two counties in central Norway. Methods: A questionnaire was sent to 7,004 farmers in Norway. We asked for information about the respondents and the farm, whether the farmer had had work-related injuries on the farm during the past 12 months, and details about the incidence and seriousness of the injury. Results: A total of 2,699 respondents gave a response rate of 42%. Of the respondents, 249 (9.2%) reported one or more work-related injuries. The most usual cause of injury involved an animal, and >75% of these happened inside the outbuilding. Among these, 17.5% had a consequence of sick leave or a more serious result. When all the accidents were analyzed by stepwise logistic regression, only the variables: works alone, has >3,500 stipulated working hours at the farm, and the type of production were statistical significant explanatory variables for having an injury. Conclusion: Incorporating safety aspects to a greater extend in the design and construction of outbuildings would make a substantial contribution to injury prevention in agriculture.
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Toward energy-efficient content dissemination
Uichin Lee,Rimac, I,Kilper, D,Hilt, V IEEE 2011 IEEE network Vol.25 No.2
<P>A major role of today's Internet is to provide efficient content dissemination among users, such as distributing multimedia content and sharing user generated data. To meet the ever increasing demands, the Internet has been rapidly growing, and it now includes a web of tens of millions of networked devices ranging from content servers to core and edge routers to home gateways. Due to the sheer numbers, however, it is reported that these devices, such as those used for content delivery, consume a considerable amount of energy. While optimizing the energy efficiency of data centers is well studied in the literature, understanding the energy efficiency of various content dissemination strategies has received comparatively little attention thus far. In this article we review existing content dissemination architectures and survey the energy efficiency of various network devices used for content delivery. The energy efficiency comparison using simple trace-based simulations reveals that a change from a host-oriented to a content-centric networking model can substantially improve energy efficiency of content dissemination. Our preliminary results are encouraging and will stimulate further research in this direction.</P>
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Nonfatal Occupational Injuries in Norwegian Farmersq
Kristin Svendsen,Oddfrid Aas,Bjørn Hilt 한국산업안전보건공단 산업안전보건연구원 2014 Safety and health at work Vol.5 No.3
Background: Agriculture ranks among the most dangerous trades worldwide. There is, however, still alack of knowledge on nonfatal injuries in agriculture. The aim of this study was to describe the natureand occurrence of nonfatal injuries in farmers in two counties in central Norway. Methods: A questionnaire was sent to 7,004 farmers in Norway. We asked for information about therespondents and the farm, whether the farmer had had work-related injuries on the farm during the past12 months, and details about the incidence and seriousness of the injury. Results: A total of 2,699 respondents gave a response rate of 42%. Of the respondents, 249 (9.2%) reportedone or more work-related injuries. The most usual cause of injury involved an animal, and >75% of thesehappened inside the outbuilding. Among these, 17.5% had a consequence of sick leave or a more seriousresult. When all the accidents were analyzed by stepwise logistic regression, only the variables: worksalone, has >3,500 stipulated working hours at the farm, and the type of production were statisticalsignificant explanatory variables for having an injury. Conclusion: Incorporating safety aspects to a greater extend in the design and construction of outbuildingswould make a substantial contribution to injury prevention in agriculture.
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