El viaje desde los cuestionarios Likert a los cuestionarios de elección forzosa: evidencia de la invarianza de los parámetros de los ítems

Multidimensional forced-choice questionnaires are widely regarded in the personnel selection literature for their ability to control response biases. Recently developed IRT models usually rely on the assumption that item parameters remain invariant when they are paired in forced-choice blocks, without giving it much consideration. This study aims to test this assumption empirically on the MUPP-2PL model, comparing the parameter estimates of the forced-choice format to their graded-scale equivalent on a Big Five personality instrument. The assumption was found to hold reasonably well, especially for the discrimination parameters. In the cases in which it was violated, we briefly discuss the likely factors that may lead to non-invariance. We conclude discussing the practical implications of the results and providing a few guidelines for the design of forced-choice questionnaires based on the invariance assumptionLos cuestionarios de elección forzosa multidimensionales son bastante apreciados en la literatura de selección de personal por su capacidad para controlar los sesgos de respuesta. Los modelos de TRI desarrollados recientemente normalmente asumen que los parámetros de los ítems permanecen invariantes cuando se emparejan en bloques de elección forzosa, sin dedicarle mucha atención. Este estudio tiene como objetivo poner a prueba empíricamente este supuesto en el modelo MUPP-2PL, comparando las estimaciones de los parámetros del formato de elección forzosa con su equivalente en escala graduada, en un instrumento de personalidad Big Five. Se encontró que el supuesto se cumplía razonablemente bien, especialmente para los parámetros de discriminación. En los casos en los que no se cumplió se discuten brevemente los posibles factores que pueden dar lugar a no invarianza. Concluimos discutiendo las implicaciones prácticas de los resultados y proponiendo algunas pautas para el diseño de cuestionarios de elección forzosa basados en el supuesto de invarianzaThis research is funded by the Spanish government’s Ministerio de Economia y Competitividad, projects PSI 2015-65557-P and PSI 2017-85022-

Derecho a la información y democracia en el marco de la globalización neoliberal: bibliotecas, archivos y medios de comunicación de masas

The article deals with the importance of the right to information for participation in democracy, a right exercised mainly through mass communications media but in which libraries and archives are also concerned. The consideration of information as a commodity and the treatment of public services as such constitute a threat to the citizen’s information rights and, consequently, to deterioration in the quality of the democracy

Relacion de los usos y derechos de la villa de Pertusa, y lugares de Barbuñales, su barrio, la Luenga, Perdiguera, y La Almunia, Quadrada, sus aldeas, con la ciudad de Çaragoça, su señora

Copia digital : Diputación Provincial de Zaragoza. Servicio de Archivos y Bibliotecas, 2010Datos de tít. tomados de p.1, y mención de responsabilidad del final del textoSign.: A\p5\

Mitochondrial dysfunction promoted by Porphyromonas gingivalis lipopolysaccharide as a possible link between cardiovascular disease and periodontitis

Oxidative stress is one of the factors that could explain the pathophysiological mechanism of inflammatory conditions that occur in cardiovascular disease (CVD) and periodontitis. Such inflammatory response is often evoked by specific bacteria, as the lipopolysaccharide (LPS) of Porphyromonas gingivalis is a key factor in this process. The aim of this research was to study the role of mitochondrial dysfunction in peripheral blood mononuclear cells (PBMCs) from periodontitis patients and to evaluate the influence of LPS on fibroblasts to better understand the pathophysiology of periodontitis and its relationship with CVD. PBMCs from patients showed lower CoQ10 levels and citrate synthase activity, together with high levels of ROS production. LPS-treated fibroblasts provoked increased oxidative stress and mitochondrial dysfunction by a decrease in mitochondrial protein expression, mitochondrial mass, and mitochondrial membrane potential. Our study supports the hypothesis that LPS-mediated mitochondrial dysfunction could be at the origin of oxidative stress in periodontal patients. Abnormal PBMC performance may promote oxidative stress and alter cytokine homeostasis. In conclusion, mitochondrial dysfunction could represent a possible link to understanding the interrelationships between two prominent inflammatory diseases: periodontitis and CV

Advertencias por el señor Lugarteniente Ortigas, en su denunciacion

Copia digital : Diputación Provincial de Zaragoza. Servicio de Archivos y Bibliotecas, 2010Datos de tít. tomados de p.1, y mención de responsabilidad del final del textoInic. grab. xil. en p.1Precede al texto cruz de Malt

Labrum romano procedente de las termas del campamento de la Legio VII gemina en León

Durante las excavaciones desarrolladas en 1996 en el sector de Puerta Obispo, situado junto a la puerta oriental del recinto romano y medieval de la ciudad de León, se hallaron tres grandes fragmentos de marmora de color violáceo que formaban parte de un labrum o lavabo de época romana. Los lavabos, pilas o tazas de fuente talladas en piedra o mármol son elementos funcionales y decorativos bastante comunes en el mundo romano, si bien en las provincias hispanas se encuentran escasamente documentados, lo que puede obedecer a un problema de publicación más que a una ausencia en el registro arqueológico. Este ejemplar hallado en León, realizado con piedra de las canteras de Espejón (Burgos, Castilla y León), y con toda seguridad relacionado con las termas legionarias, viene a completar el mapa de dispersión de este tipo de elementos en el ámbito de la antigua Hispania, permitiendo asimismo reflexionar sobre aspectos productivos y funcionales relativos a los labraThree large purplish fragments of marmora were found during the excavations carried out in 1996 in the Puerta Obispo area, next to the eastern gate of the Roman and Medieval city of León. They belonged to a Roman basin (labrum). Roman marbled basins are commonplace functional and ornamental elements in the Roman World. However, such elements have been seldom documented in Hispanic provinces, maybe due to publishing-related problems rather than to the absence of findings. The fragments found in León, made with stone of the quarries of Espejón (Burgos, Castilla y León), possibly connected with the legionary baths, completes the dispersion map for this kind of element in ancient Hispania, while it makes it possible to further address our attention to productive and functional aspects connected with the labraEste trabajo se ha llevado a cabo en el marco de los proyectos de investigación: Campamentos romanos en Hispania: análisis diacrónico de las estructuras defensivas (I+D HUM2006-00534), concedido por Ministerio de Educación y Ciencia, que se realiza desde el 1 de octubre de 2006, así como del proyecto: Los campamentos romanos de las legiones VI victrix y VII gemina en León. Estudio del material arqueológico procedente de las excavaciones arqueológicas en la ciudad de León (Casa Pallarés y Santa Marina), concedido por la Junta de Castilla y León y desarrollado entre 2006 y 2010. Ambos se realizan bajo la dirección de uno de nosotros (Ángel Morillo

Fractal Topological Analysis for 2D Binary Digital Images

Fractal dimension is a powerful tool employed as a measurement of geometric aspects. In this work we propose a method of topological fractal analysis for 2D binary digital images by using a graph-based topological model of them, called Homological Spanning Forest (HSF, for short). Defined at interpixel level, this set of two trees allows to topologically describe the (black and white) connected component distribution within the image with regards to the relationship “to be surrounded by”. This distribution is condensed into a rooted tree, such that its nodes are connected components determined by some special sub-trees of the previous HSF and the levels of the tree specify the degree of nesting of each connected component. We ask for topological auto-similarity by comparing this topological description of the whole image with a regular rooted tree pattern. Such an analysis can be used to directly quantify some characteristics of biomedical images (e.g. cells samples or clinical images) that are not so noticeable when using geometrical approaches.Ministerio de Economía y Competitividad TEC2016-77785-PMinisterio de Economía y Competitividad MTM2016-81030-

Comparative study of AR versus video tutorials for minor maintenance operations

[EN] Augmented Reality (AR) has become a mainstream technology in the development of solutions for repair and maintenance operations. Although most of the AR solutions are still limited to specific contexts in industry, some consumer electronics companies have started to offer pre-packaged AR solutions as alternative to video-based tutorials (VT) for minor maintenance operations. In this paper, we present a comparative study of the acquired knowledge and user perception achieved with AR and VT solutions in some maintenance tasks of IT equipment. The results indicate that both systems help users to acquire knowledge in various aspects of equipment maintenance. Although no statistically significant differences were found between AR and VT solutions, users scored higher on the AR version in all cases. Moreover, the users explicitly preferred the AR version when evaluating three different usability and satisfaction criteria. For the AR version, a strong and significant correlation was found between the satisfaction and the achieved knowledge. Since the AR solution achieved similar learning results with higher usability scores than the video-based tutorials, these results suggest that AR solutions are the most effective approach to substitute the typical paper-based instructions in consumer electronics.This work has been supported by Spanish MINECO and EU ERDF programs under grant RTI2018-098156-B-C55.Morillo, P.; García García, I.; Orduña, JM.; Fernández, M.; Juan, M. (2020). Comparative study of AR versus video tutorials for minor maintenance operations. Multimedia Tools and Applications. 79(11-12):7073-7100. https://doi.org/10.1007/s11042-019-08437-9S707371007911-12Ahn J, Williamson J, Gartrell M, Han R, Lv Q, Mishra S (2015) Supporting healthy grocery shopping via mobile augmented reality. ACM Trans Multimedia Comput Commun Appl 12(1s):16:1–16:24. https://doi.org/10.1145/2808207Anderson TW (2011) Anderson–darling tests of goodness-of-fit. Springer, Berlin, pp 52–54. https://doi.org/10.1007/978-3-642-04898-2_118Awad N, Lewandowski SE, Decker EW (2015) Event management system for facilitating user interactions at a venue. US Patent App. 14/829,382Azuma R (1997) A survey of augmented reality. Presence: Teleoperators and Virtual Environments 6(4):355–385Baird K, Barfield W (1999) Evaluating the effectiveness of augmented reality displays for a manual assembly task. Virtual Reality 4:250–259Ballo P (2018) Hardware and software for ar/vr development. In: Augmented and virtual reality in libraries, pp 45–55. LITA guidesBarrile V, Fotia A, Bilotta G (2018) Geomatics and augmented reality experiments for the cultural heritage. Applied Geomatics. https://doi.org/10.1007/s12518-018-0231-5Billinghurst M, Duenser A (2012) Augmented reality in the classroom. Computer 45(7):56–63. https://doi.org/10.1109/MC.2012.111Bowman DA, McMahan RP (2007) Virtual reality: how much immersion is enough? Computer 40(7)Brown TA (2015) Confirmatory factor analysis for applied research. Guilford PublicationsDodge Y. (ed) (2008) Kruskal-Wallis test. Springer, New York. https://doi.org/10.1007/978-0-387-32833-1_216Elmunsyah H, Hidayat WN, Asfani K (2019) Interactive learning media innovation: utilization of augmented reality and pop-up book to improve user’s learning autonomy. J Phys Conf Ser 1193(012):031. https://doi.org/10.1088/1742-6596/1193/1/012031Entertainment L (2017) Dolphin Player. https://play.google.com/store/apps/details?id=com.broov.player. Online; Accessed 09-September-2017Fletcher J, Belanich J, Moses F, Fehr A, Moss J (2017) Effectiveness of augmented reality & augmented virtuality. In: MODSIM Modeling & simulation of systems and applications) world conferenceFraga-Lamas P, Fernández-Caramés TM, Blanco-Novoa O, Vilar-Montesinos MA (2018) A review on industrial augmented reality systems for the industry 4.0 shipyard. IEEE Access 6:13,358–13,375. https://doi.org/10.1109/ACCESS.2018.2808326Furió D, Juan MC, Seguí I, Vivó R (2015) Mobile learning vs. traditional classroom lessons: a comparative study. J Comput Assist Learn 31(3):189–201. https://doi.org/10.1111/jcal.12071Gavish N, Gutiérrez T, Webel S, Rodríguez J, Peveri M, Bockholt U, Tecchia F (2015) Evaluating virtual reality and augmented reality training for industrial maintenance and assembly tasks. Interact Learn Environ 23(6):778–798. https://doi.org/10.1080/10494820.2013.815221Gimeno J, Morillo P, Orduña JM, Fernández M (2013) A new ar authoring tool using depth maps for industrial procedures. Comput Ind 64(9):1263–1271. https://doi.org/10.1016/j.compind.2013.06.012Holzinger A, Kickmeier-Rust MD, Albert D (2008) Dynamic media in computer science education; content complexity and learning performance: is less more? Educational Technology & Society 11(1):279–290Hornbaek K (2013) Some whys and hows of experiments in human–computer interaction. Foundations and TrendsⓇ in Human–Computer Interaction 5(4):299–373. https://doi.org/10.1561/1100000043Huang J, Liu S, Xing J, Mei T, Yan S (2014) Circle & search: Attribute-aware shoe retrieval. ACM Trans Multimedia Comput Commun Appl 11 (1):3:1–3:21. https://doi.org/10.1145/2632165Jiang S, Wu Y, Fu Y (2018) Deep bidirectional cross-triplet embedding for online clothing shopping. ACM Trans Multimedia Comput Commun Appl 14(1):5:1–5:22. https://doi.org/10.1145/3152114Kim SK, Kang SJ, Choi YJ, Choi MH, Hong M (2017) Augmented-reality survey: from concept to application. KSII Transactions on Internet and Information Systems 11:982–1004. https://doi.org/10.3837/tiis.2017.02.019Langlotz T, Zingerle M, Grasset R, Kaufmann H, Reitmayr G (2012) Ar record&replay: Situated compositing of video content in mobile augmented reality. In: Proceedings of the 24th Australian Computer-Human Interaction Conference, OzCHI ’12. ACM, New York, pp 318–326, DOI https://doi.org/10.1145/2414536.2414588, (to appear in print)Martin-SanJose JF, Juan MC, Mollá R, Vivó R (2017) Advanced displays and natural user interfaces to support learning. Interact Learn Environ 25(1):17–34. https://doi.org/10.1080/10494820.2015.1090455Massey FJ (1951) The kolmogorov-Smirnov test for goodness of fit. J Am Stat Assoc 46(253):68–78van der Meij H, van der Meij J, Voerman T, Duipmans E (2018) Supporting motivation, task performance and retention in video tutorials for software training. Educ Technol Res Dev 66(3):597–614. https://doi.org/10.1007/s11423-017-9560-zvan der Meij J, van der Meij H (2015) A test of the design of a video tutorial for software training. J Comput Assist Learn 31 (2):116–132. https://doi.org/10.1111/jcal.12082Mestre LS (2012) Student preference for tutorial design: a usability study. Ref Serv Rev 40(2):258–276. https://doi.org/10.1108/00907321211228318Mohr P, Kerbl B, Donoser M, Schmalstieg D, Kalkofen D (2015) Retargeting technical documentation to augmented reality. In: Proceedings of the 33rd annual ACM conference on human factors in computing systems, CHI ’15. ACM, New York, pp 3337–3346, DOI https://doi.org/10.1145/2702123.2702490, (to appear in print)Mohr P, Mandl D, Tatzgern M, Veas E, Schmalstieg D, Kalkofen D (2017) Retargeting video tutorials showing tools with surface contact to augmented reality. In: Proceedings of the 2017 CHI conference on human factors in computing systems, CHI ’17. ACM, New York, pp 6547–6558, DOI https://doi.org/10.1145/3025453.3025688, (to appear in print)Montgomery DC, Runger GC (2003) Applied statistics and probability for engineers. Wiley, New YorkMorillo P, Orduña JM, Casas S, Fernández M (2019) A comparison study of ar applications versus pseudo-holographic systems as virtual exhibitors for luxury watch retail stores. Multimedia Systems. https://doi.org/10.1007/s00530-019-00606-yMorse JM (2000) Determining sample size. Qual Health Res 10(1):3–5. https://doi.org/10.1177/104973200129118183Muñoz-Montoya F, Juan M, Mendez-Lopez M, Fidalgo C (2019) Augmented reality based on slam to assess spatial short-term memory. IEEE Access 7:2453–2466. https://doi.org/10.1109/ACCESS.2018.2886627Neuhäuser M (2011) Wilcoxon–Mann–Whitney test. Springer, Berlin, pp 1656–1658Neumann U, Majoros A (1998) Cognitive, performance, and systems issues for augmented reality applications in manufacturing and maintenance. In: Inproceedings of the IEEE virtual reality annual international symposium (VR ’98), pp 4–11no JJA, Juan MC, Gil-Gómez JA, Mollá R. (2014) A comparative study using an autostereoscopic display with augmented and virtual reality. Behaviour & Information Technology 33(6):646–655. https://doi.org/10.1080/0144929X.2013.815277Palmarini R, Erkoyuncu JA, Roy R, Torabmostaedi H (2018) A systematic review of augmented reality applications in maintenance. Robot Comput Integr Manuf 49:215–228Quint F, Loch F (2015) Using smart glasses to document maintenance processes. Mensch und Computer 2015–WorkshopbandRadkowski R, Herrema J, Oliver J (2015) Augmented reality-based manual assembly support with visual features for different degrees of difficulty. International Journal of Human–Computer Interaction 31(5):337–349. https://doi.org/10.1080/10447318.2014.994194Regenbrecht H, Schubert T (2002) Measuring presence in augmented reality environments: design and a first test of a questionnaire, Porto, PortugalRobertson J (2012) Likert-type scales, statistical methods, and effect sizes. Commun ACM 55(5):6–7. https://doi.org/10.1145/2160718.2160721Rodríguez-Andrés D, Juan MC, Méndez-López M, Pérez-Hernández E, Lluch J (2016) Mnemocity task: Assessment of childrens spatial memory using stereoscopy and virtual environments. PLos ONE 1(8). https://doi.org/10.1371/journal.pone.0161858Sanna A, Manuri F, Lamberti F, Paravati G, Pezzolla P (2015) Using handheld devices to support augmented reality-based maintenance and assembly tasks. In: 2015 IEEE International conference on consumer electronics (ICCE), pp. 178–179. https://doi.org/10.1109/ICCE.2015.7066370Schmidt S, Ehrenbrink P, Weiss B, Voigt-Antons J, Kojic T, Johnston A, Moller S (2018) Impact of virtual environments on motivation and engagement during exergames. In: 2018 Tenth international conference on quality of multimedia experience (qoMEX), pp 1–6. https://doi.org/10.1109/QoMEX.2018.8463389Shapiro SS, Wilk MB (1965) An analysis of variance test for normality (complete samples). Biometrika 52(3/4):591–611Tang A, Owen C, Biocca F, Mou W (2003) Comparative effectiveness of augmented reality in object assembly. In: Proceedings of the SIGCHI conference on human factors in computing systems, CHI ’03. ACM, New York, pp 73–80, DOI https://doi.org/10.1145/642611.642626, (to appear in print)Tomás JM, Oliver A, Galiana L, Sancho P, Lila M (2013) Explaining method effects associated with negatively worded items in trait and state global and domain-specific self-esteem scales. Structural Equation Modeling: A Multidisciplinary Journal 20(2):299–313. https://doi.org/10.1080/10705511.2013.769394Uva AE, Gattullo M, Manghisi VM, Spagnulo D, Cascella GL, Fiorentino M (2017) Evaluating the effectiveness of spatial augmented reality in smart manufacturing: a solution for manual working stations. The Int J Adv Manuf Technol: 1–13Wang X, Ong SK, Nee AYC (2016) A comprehensive survey of augmented reality assembly research. Advances in Manufacturing 4(1):1–22. https://doi.org/10.1007/s40436-015-0131-4Westerfield G, Mitrovic A, Billinghurst M (2015) Intelligent augmented reality training for motherboard assembly. Int J Artif Intell Educ 25(1):157–172. https://doi.org/10.1007/s40593-014-0032-xWiedenmaier S, Oehme O, Schmidt L, Luczak H (2003) Augmented reality (ar) for assembly processes - design and experimental evaluation. International Journal of Human-Computer Interaction 16(3):497–514Witmer BG, Singer MJ (1998) Measuring presence in virtual environments: a presence questionnaire. Presence: Teleoperators and Virtual Environments 7(3):225–240Wu HK, Lee SWY, Chang HY, Liang JC (2013) Current status, opportunities and challenges of augmented reality in education. Computers & Education 62:41–49. https://doi.org/10.1016/j.compedu.2012.10.024Yim MYC, Chu SC, Sauer PL (2017) Is augmented reality technology an effective tool for e-commerce? an interactivity and vividness perspective. Journal of Interactive Marketing 39(http://www.sciencedirect.com/science/article/pii/S1094996817300336):89–103. https://doi.org/10.1016/j.intmar.2017.04.001Yuan ML, Ong SK, Nee AYC (2008) Augmented reality for assembly guidance using a virtual interactive tool. Int J Prod Res 46(7):1745–1767. https://doi.org/10.1080/0020754060097293

Wireless location: A survey about GSM in location techniques

Security has become one of the most important fea tures in modern computation, especially due to the point of view of the user. Security issues (like pri vacy or secure use of the application) will be taken into account during the evaluation of the system by the final user. Also, it is an important issue for the developer, due to the reason that the developer should be sure about the correct performance of the system. The purpose of this paper is to offer a deep survey on existent attacks to GSM location adapt ing them from common GSM attacks to location attacks