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Tiffanye M. Vargas,Sandra E. Short 한국코칭능력개발원 2011 International Journal of Coaching Science Vol.5 No.1
Pre-game speeches are a popular coaching technique. While recent research has begun to examine their effectiveness (Vargas-Tonsing & Guan, 2007; Vargas-Tonsing & Bartholomew, 2006), little is known about athletes’ perceptions of the effects of these speeches. Participants were 151 soccer players representing 10 elite soccer teams (five male and five female teams). Athletes had a mean age of 14.21 years (SD = 1.85) and reported an average of 8.83 years (SD = 2.26) of soccer playing experience. Athletes completed a questionnaire at the conclusion of a game that asked them to describe and elaborate on their perceptions of the coaches’ pre-game speech; responses were analyzed qualitatively. The results showed that the majority of the athletes reported liking the speeches and indicated that the speeches impacted their performance and met their psychological, emotional and performance needs. The results offer insight into athletes’ preferences for speech content and demonstrate the need for further research in this area.
Clinical comparison of marginal fit of ceramic inlays between digital and conventional impressions
Franklin Guillermo Vargas-Corral,Américo Ernesto Vargas-Corral,Miguel Angel Rodríguez Valverde,Manuel Bravo,Juan Ignacio Rosales Leal 대한치과보철학회 2024 The Journal of Advanced Prosthodontics Vol.16 No.1
Purpose. To evaluate the metameric disparities among monolithic zirconia materials with differing yttrium compositions across various lighting conditions. Materials and Methods. Thirty-six square-shaped zirconia samples measuring 10 × 10 × 0.5 mm were prepared from monolithic zirconia materials with three different yttrium contents. A 0.2 mm thick layer of polymerized dual-polymerizable self-adhesive resin cement was created using a silicone mold with the same dimensions as the prepared zirconia specimens. To evaluate metamerism, color measurements were conducted using a spectrophotometer device on a neutral gray background in a color measurement cabinet that offers four different illumination environments. All samples underwent aging by subjecting them to 10000 thermal cycles using a thermal cycle tester. Following thermal aging, color measurements were taken once more, and the data were recorded using the CIE L*, a*, b* color system. Two-way ANOVA and Post-hoc Bonferroni tests were employed to analyze the data. Results. It was observed that there was no statistical difference among the color measurements made in different illumination environments of the monolithic zirconia ceramics used to evaluate metamerism (P > .05). This observation remained consistent both before and after thermal aging. After thermal aging, the color of monolithic zirconia materials exhibited a tendency towards red and yellow hues, accompanied by a decrease in brightness levels. Conclusion. It can be stated that different illumination conditions did not affect the metamerism of monolithic zirconia materials, but there was a color change in monolithic zirconia materials after a thermal aging period equivalent to one year.
QoS-Oriented Solutions for Satellite Broadcasting Systems
Vargas, Aharon,Gerstacker, Wolfgang H.,Breiling, Marco The Korea Institute of Information and Commucation 2010 Journal of communications and networks Vol.12 No.6
In this paper, we analyze the capability of satellite broadcasting systems to offer different levels of quality of service (QoS). We focus on the European telecommunications standards institute satellite digital radio and digital video broadcasting satellite handheld (DVB-SH) standards, which have recently been proposed for satellite broadcasting communications. We propose a strategy to provide different levels of QoS for the DVB-SH standard on the basis of an extension of the interleaving scheme, referred to as molded interleaver, which supports low latency service requirements for interactive services. An extensive analysis based on laboratory measurements shows the benefits of this solution. We also present a multilevel coding (MLC) scheme with multistage decoding designed for broadcasting communications as an alternative to the existing standards, where services with different levels of QoS are provided. We present a graphical method based on mutual information for the design and evaluation of MLC systems used for broadcasting communications. Extensive simulations for a typical satellite channel show the viability of the proposed MLC scheme. Finally, we introduce multidimensional constellations in the proposed MLC scheme in order to increase the number of different protection levels.
Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO<sub>3</sub> Thin Films
Varga, Tamas,Droubay, Timothy C.,Kovarik, Libor,Nandasiri, Manjula I.,Shutthanandan, Vaithiyalingam,Hu, Dehong,Kim, Bumsoo,Jeon, Seokwoo,Hong, Seungbum,Li, Yulan,Chambers, Scott A. American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.26
<P>Polarization-induced weak ferromagnetism (WFM) was demonstrated a few years back in LiNbO3-type compounds, MTiO3 (M = Fe, Mn, Ni). Although the coexistence of ferroelectric polarization and ferromagnetism has been demonstrated in this rare multiferroic family before, first in bulk FeTiO3, then in thin-film NiTiO3, the coupling of the two order parameters has not been confirmed Here, we report the stabilization of polar, ferromagnetic NiTiO3 by oxide epitaxy on a LiNbO3 substrate utilizing tensile strain and demonstrate the theoretically predicted coupling between its polarization and ferromagnetism by X-ray magnetic circular dichroism under applied fields. The experimentally observed direction of ferroic ordering in the film is supported by simulations using the phase-field approach. Our work validates symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and WFM in MTiO3 transition metal titanates crystallizing in the LiNbO3 structure. It also demonstrates the applicability of epitaxial strain as a viable alternative to high-pressure crystal growth to stabilize metastable materials and a valuable tuning parameter to simultaneously control two ferroic order parameters to create a multiferroic. Multiferroic NiTiO3 has potential applications in spintronics where ferroic switching is used, such as new four-stage memories and electromagnetic switches.</P>
Epstein-Barr Virus Antibody Titers Are Not Associated with Gastric Cancer Risk in East Asia
Varga, Matthew G.,Cai, Hui,Waterboer, Tim,Murphy, Gwen,Shimazu, Taichi,Taylor, Phil R.,Qiao, You-Lin,Park, Sue K.,Yoo, Keun-Young,Jee, Sun Ha,Cho, Eo Rin,Kim, Jeongseon,Abnet, Christian C.,Tsugane, Sh Springer-Verlag 2018 Digestive diseases and sciences Vol.63 No.10
NORTH AMERICAN OVERVIEW ON SUSTAINABILITY APPROACH IN BAKING INDUSTRY
Vargas-Hernández José G.,Ouijano Elsa Patricia Orozco 한국캐나다학회 2022 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.28 No.1
This study analyses the potential, challenges, and opportunities of sustainability in North American baking industry. It departs from the assumption that the baking industry in Canada, United States and Mexico are facing challenges to adjust its production and distribution operations to the sustainable development goals. The methods employed are the analytical-descriptive approach to the various reports on the sustainability concerns leading to a more reflective outcomes about the reality. It is concluded that the assumptions about the relationship between food policies and sustainable development in North American baking industry led to conclude that is weak, if not lacking, to address all the interconnected and interrelated social, environmental, and economic issues and concerns. In fact, the research findings are directed towards explaining this lack of engagement between policy making and implementation in the baking industry across America to be able to deliver better nutrition, health, and lifestyle to consumers.
On Line 시스템에 의한 실시간 입도측정 및 분쇄의 자동제어
Vargas Mariola Lopez,Hernandez Francisco Ayuso,Vilchez Francisco Martinez,Pugh David,Blasco Alain 한국시멘트협회 2004 시멘트 심포지움 Vol.31 No.-
온라인 분쇄입도 조절 콘트롤(Insitec) 시스템은 시멘트의 생산공정상에 시멘트입도를 직접 측정하고 측정된 데이터를 이용하여 공정을 제어할수 있는 새로운 방법으로서, 세계적으로 50여개의 시멘트 생산 현장에 이러한 시스템이 설치되어 있다. 시멘트의 생산공정은 일반적인 분쇄공정과는 차별되는 나름데로의 특성이 있으므로 이를 개발한 Malvern Instrument사(영국)에서는 시멘트 공장의 특성에 적합한 시스템을 개발해왔다. 우선 가장 이상적인 Instec 시스템의 설치를 위해서는 다음과 같이 3단계의 절차가 필요하다. 첫 단계로서 공정상의 변수로 적용되어야 될 변화를 찾아 모니터링하고 연관시키는 것이다. 그 다음 단계에서, 시멘트 생산공정을 24시간 동안 모니터링하여 설정 값과 측정 값과의 차이점과 원인을 찾아내어 요인을 결정하게 되고, 마지막 단계에서는 현장에 장비를 설치, 상기의 반복과정을 마무리하고 공정을 제어할 수 있게 하는 것이다. 시멘트 생산공정에서 분쇄기, 분급기 및 송풍기 등의 회전수 증가와 감소, 시멘트조성의 변화와 같은 중요한 공정상의 변화가 있을 경우, 이로 인해 생기는 입도의 영향은 Insitec 시스템의 입도관리에 기록되게 된다. 본 논문에서는 스페인의 Jerez에 있는 Holcim 플랜트에 설치된 Insitech를 이용하여 운전상의 변수 등을 측정하고 제어하며 시멘트 공정에 활용하는 방안에 대한 연구를 소개한 것이다.
Poisson's Ratio Measurement Using a Pair of PVDF Ultrasonic Transducer
Vargas, Enrique,Toral, Sergio,Gonzalez, Vicente The Korean Society for Nondestructive Testing 2009 한국비파괴검사학회지 Vol.29 No.6
This work presents a simple technique to determine the Poisson's ratio of homogeneous solid material using a pair of low cost PVDF ultrasonic transducers. It is based on transducer's property of generating longitudinal and transversal waves depending on the excitation frequency. Mechanical tests were conducted to validate the proposed method, resulting in a good agreement between ultrasonic and mechanical techniques.