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- 저자 : Cuenca, Jerome A. (검색결과 20 건)
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Occupational Hazards in Firefighting: Systematic Literature Review
Cuenca-Lozano María F.,Ramírez-García César O. 한국산업안전보건공단 산업안전보건연구원 2023 Safety and health at work Vol.14 No.1
Background: Firefighting involves exposure of firefighters to risks related to this activity, serious injuries, and occupational diseases are recorded. There are other consequences such as thermal and emotional stress. This systematic review is proposed in order to analyze the risks and consequences faced by these workers and thus provide elements to improve safety management systems in institutions. Method: A descriptive observational study of systematic literature review on the risks and consequences of exposure to firefighters’ activity was proposed, and the information was analyzed and described based on the available data and according to the variables determined. Results: The studies showed data on mechanical, physical, chemical, psychosocial risks, workers’ perception and resilience, and epidemiological data. Information related to firefighters’ activity on falls and slips, exposure to noise, and high concentrations of carbon monoxide is detailed. In addition, the relationship between burnout, cognitive, and physical fatigue as adverse effects on health and performance is mentioned. Conclusions: Among the preventive measures, the use of personal protective equipment is suggested, incorporation in prevention programs of information on exposure to risk factors, as well as the implementation of models that can predict the perception of workers, additionally, the generation of management systems with safety climate models for fire departments.
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Microwave cavity perturbation of nitrogen doped nano-crystalline diamond films
Cuenca, Jerome A.,Sankaran, Kamatchi Jothiramalingam,Pobedinskas, Paulius,Panda, Kalpataru,Lin, I-Nan,Porch, Adrian,Haenen, Ken,Williams, Oliver A. Elsevier 2019 Carbon Vol.145 No.-
<P><B>Abstract</B></P> <P>Non-contact and non-destructive electrical conductivity measurements of nitrogen doped nano-crystalline diamond films have been demonstrated using a microwave cavity perturbation system. The conductivity of the films was controlled by simply varying the CH<SUB>4</SUB> gas concentration during microwave plasma assisted chemical vapour deposition, thereby promoting the formation of sp<SUP>2</SUP> carbon at the grain boundaries. The presence of sp<SUP>2</SUP> carbon is verified through Raman spectroscopy, x-ray photoelectron spectroscopy and electron energy loss spectroscopy, while scanning electron microscopy confirms an increasing surface area for sp<SUP>2</SUP> to form. The microwave cavity perturbation results show that the measured cavity quality factor varies with CH<SUB>4</SUB> concentration. The extraction of conductivity is achieved through a depolarisation model, which must be considered when the sample is smaller than the cavity and through both electric and magnetic field perturbations. The microwave measurements are comparable to contacting and damaging measurements when the film conductivity is greater than the substrate, thus demonstrating an invaluable method for determining conductivity without the need for depositing any electrodes on the film.</P>
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A Non-Uniform Predictor-Observer for a Networked Control System
Angel Cuenca,Pedro García,Pedro Albertos,Julián Salt 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.6
This paper presents a Non-Uniform Predictor-Observer (NUPO) based control approach in order to deal with two of the main problems related to Networked Control Systems (NCS) or Sensor Networks (SN): time-varying delays and packet loss. In addition, if these delays are longer than the sampling period, the packet disordering phenomenon can appear. Due to these issues, a (scarce) non-uniform, delayed measurement signal could be received by the controller. But including the NUPO proposal in the control system, the delay will be compensated by the prediction stage, and the non-available data will be reconstructed by the observer stage. So, a delay-free, uniformly sampled controller design can be adopted. To ensure stability, the predictor must satisfy a feasibility problem based on a time-varying delay-dependent condition expressed in terms of Linear Matrix Inequalities (LMI). Some aspects like the relation between network delay and robustness/performance trade-off are empirically studied. A simulation example shows the benefits (robustness and control performance improvement) of the NU-PO approach by comparison to another similar proposal.
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Angel Cuenca,Julián Salt,Vicente Casanova,Ricardo Pizá 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.2
This paper presents a control strategy to face time-varying delays induced in a Networked Control System (NCS). The delay is divided into two parts: the largest one (an integer multiple of the bus cycle) is compensated by means of an adaptive multi-rate Smith predictor, and the smallest one (whose value is strictly smaller than the bus cycle) via a gain scheduling approach based on root locus contour and linearization techniques. The gains to be scheduled belong to a multi-rate PID controller. Control system stability is studied by means of Lyapunov theory. Simulation results and the implementation on a test-bed Profibus-DP environment illustrate that this control structure can maintain NCS performance and stability, despite the considered delays.
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Self-healing Capacity of Fiber Reinforced Cementitious Composites. State of the Art and Perspectives
E. Cuenca,L. Ferrara 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.7
Design of building structures and infrastructures is mainly based on four concepts: safety, serviceability, durability and sustainability. The latter is becoming increasingly relevant in the field of civil engineering. Reinforced concrete structures are subjected to damages that produce cracks which, if not repaired, can lead to a rapid deterioration and would result into increasing maintenance costs to guarantee the anticipated level of performance. Therefore, self-healing concrete can be very useful in any type of structures, as it allows to control and repairing cracks as soon as they are likely to occur. The effectiveness of self-healing can be improved with the use of fibers due to their capacity to control crack width and enhance multiple crack formation. In that way, researchers should use advanced cement based materials (FRCC, HPFRCC, etc.) and techniques (autogenous and engineering healing) to satisfy all demands in which sustainability and durability are key factors. Compared to the large number of investigations on selfhealing of plain concrete, self-healing studies on Fiber Reinforced Cementitious Composites (FRCC) are still limited. Therefore, the main objective of this paper is to provide a deep literature review on this subject in order to clarify what is known (What now?) and finally to identify those gaps which still require further studies (What next?) such as: healing capacity under sustained stress, repeatability healing/cracking cycles as well as healing capacity for cracks and damages occurring at later concrete ages.
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Adriana Cuenca,Aura Coy,Natalia Gutiérrez,María Paula Santos,Juan David Bustos,Ana María Morales,Alejandra Marín 대한소아응급의학회 2023 대한소아응급의학회지 Vol.10 No.1
Purpose: During the coronavirus disease 2019 pandemic, Colombian government declared a lockdown, forcing children to stay at home. The authors aimed to analyze the change in the pattern of trauma-related visits during the lockdown. Methods: We carried out a retrospective descriptive study on injured children aged 17 years or younger who visited the emergency department of a tertiary pediatric hospital in Bogotá, Colombia from March 15 through May 15, 2019 (control period) and the same period in 2020 (lockdown period). Between the 2 periods, baseline characteristics and injury profiles were compared. Results: Among the study population (n = 1,485), 1,122 and 363 children visited the emergency department during the control and lockdown periods, respectively. In the midst of 73.9% decrease in numbers of overall visits between the 2 periods, a 67.6% decrease was noted in number of trauma-related visits. Regarding the proportions, trauma-related visits increased from 7.9% to 9.8%. During the lockdown, increases occurred in the proportions of the following variables: children younger than 5 years (25.5% to 50.7%; P < 0.001), mechanisms other than blunt, minor fall or traffic accident (e.g., bite, 3.9% to 6.6%; P = 0.032), child abuse (1.2% to 4.1%; P = 0.003), hospitalization (4.6% to 35.8%; P < 0.001), open wound (21.1% to 36.9%; P < 0.001), the use of computed tomography (6.3% to 9.9%; P < 0.001), and abnormal imaging findings (28.8% to 31.7%; P = 0.003). Conclusion: During the lockdown, children with trauma may show an increase in overall severity, and also a higher risk of abusive trauma. This finding indicates a sensible need of educating families in prevention of domestic injury.
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John Patrick Cuenca 대한의학레이저학회 2022 MEDICAL LASERS Vol.11 No.2
Low-level laser therapy (LLLT) for vestibular treatments need further development in the sense to be used in clinical applications. One hurdle of LLLT on vestibular treatment studies is the lack of relevant parameters other researchers can reference for further studies. In this paper, we would like to provide laser parameters that are currently used in different body parts which may prove effective on vestibular hair cell regeneration at the cellular level. Following relevant parameters for laser therapy, some irradiation techniques provide protective mechanisms against ototoxic damage. The following review includes the possible mechanisms of LLLT which promote cellular and tissue regeneration capabilities with promising results. These treatments may be of use in potentially mitigating functional decline under optimized irradiation conditions. This review focused on, but is not limited to, the availability of 633 nm and 808 nm LLLT administration. These treatments provide therapeutic results in different structures under in vitro, in vivo, or ex vivo conditions. The relevant findings on the use of LLLT show similar effects of irradiation regardless of the designated area of interest. This data suggests the possibilities of using similar or modified parameters of LLLT within the vestibular organs.
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Dried Plum Ingestion Increases the Osteoblastogenic Capacity of Human Serum
Paulina Delgado Cuenca,Lama Almaiman,Simon Schenk,Mark Kern,Shirin Hooshmand 한국식품영양과학회 2017 Journal of medicinal food Vol.20 No.7
In cell culture studies, dried plum (Prunus domestica L.) polyphenols increased osteoblast alkaline phosphatase (ALP) activity, mineralized nodule formation, and the expression of the bone marker genes runt-related transcription factor 2 (RUNX2) and osterix. The purpose of this study was to determine whether human serum collected 1 and 2 h after dried plum ingestion influenced osteoblast cell activity and gene expression. Five healthy women ingested 100 g of dried plum, and serum samples were collected at baseline (before dried plum ingestion) and 1 and 2 h postingestion of dried plum. MC3T3-E1 osteoblast cells were treated (2% of medium) with these serum samples for 3 or 9 days. Intracellular and extracellular ALP activities were significantly increased after 3 or 9 days of treatment with serum both postingestion time points, with no effect seen in baseline samples. Also, serum obtained 1 and 2 h postingestion significantly increased the mRNA expression of bone markers RUNX2 and connexin43 (CX43) after both 3 and 9 days of incubation periods. Finally, serum obtained 1 and 2 h postingestion increased the mRNA expression of β-catenin after 9 days of incubation. We conclude that osteoblast activity and function are increased by dried plum ingestion, which may, in part, explain its beneficial effects on bone health.
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