A Central Limit Theorem for the SINR at the LMMSE Estimator Output for Large Dimensional Signals

This paper is devoted to the performance study of the Linear Minimum Mean Squared Error estimator for multidimensional signals in the large dimension regime. Such an estimator is frequently encountered in wireless communications and in array processing, and the Signal to Interference and Noise Ratio (SINR) at its output is a popular performance index. The SINR can be modeled as a random quadratic form which can be studied with the help of large random matrix theory, if one assumes that the dimension of the received and transmitted signals go to infinity at the same pace. This paper considers the asymptotic behavior of the SINR for a wide class of multidimensional signal models that includes general multi-antenna as well as spread spectrum transmission models. The expression of the deterministic approximation of the SINR in the large dimension regime is recalled and the SINR fluctuations around this deterministic approximation are studied. These fluctuations are shown to converge in distribution to the Gaussian law in the large dimension regime, and their variance is shown to decrease as the inverse of the signal dimension

Root canal treatment of dilacerated second maxillary premolars : planning the shaping procedure

This article aims at investigating endodontic anatomical variants in the human maxillary premolars allowing the planning of safer and faster shaping procedures. Endodontic literature describes maxillary 2nd premolars as some of the easiest teeth to treat, as they have either one or two straight canals. Rarely they may sometimes have two dilacerated canals. This paper reports two clinical cases of maxillary premolars whose anatomy is quite unusual. In the first case report we describe a maxillary 2nd premolar with a single root and two dilacerated merged canals. The second case report concerns the retreatment of a maxillary 2nd premolar with a single root and two independent dilacerated canals, and even some lateral canal. In dilacerated anatomy, canal scouting step might cause some procedural errors. To avoid these procedural errors, we propose a modern step down technique using at first a rotary NiTi glide path instrument, to go up to the 2/3 of root canal length or until to the first impediment. This would allow an easy apical scouting of the last millimeters of endodont and increase the volume of the irrigants in the apical region. In this way since a safer and faster shaping procedure could be performe

The role of effective communication and trustworthiness in determining guests’ loyalty

The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.This study investigates the role of trustworthiness and effective communication in the development of guests’ loyalty within the hotel sector. We propose and test a conceptual model that differentiates between two types of loyalty: attitudinal and behavioral. As hotels can control and manage how they communicate their desired characteristics to guests, we posit effective communication and a hotel’s trustworthiness as the key concepts in building loyalty. This study reports on the findings of a study based on 322 hotel guests. Data were analyzed using structural equation modeling. The results reveal that implementing effective communication methods leads to a trustworthy image, which in turn has a positive impact on attitudinal and behavioral loyalty. This research provides hotel managers with strategic directions for cultivating guest loyalty

Gender Role Attitudes among Higher Education Students in Jordan

Youth are the change agents of any society, therefore, it is critical to identify their attitudes toward gender roles. The study utilizes a social survey approach, where a stratified random sample is selected from the study population, which consists of Jordanian youth who are enrolled at the University of Jordan in Amman, Jordan. The size of the sample is 848 youth, with 33.5% (N=284) males and 66.5% females (N=564). A survey, based on two scales, is developed to measure youth\u2019s attitudes toward gender roles: the gender professions scale and the gender skills scale. The study also examines the effect of the following variables: age, type of college, place of residence, monthly income, and educational level of the mother. The analysis uses statistical methods to recognize differences in attitudes, to understand the relationship between the independent and dependent variables, and to determine statistical significance (set at p 64 0.05). The results show that the attitudes of female youth toward gender roles are nontraditional in comparison to those of their male counterparts. Moreover, attitudes toward gender roles tend to be gender-balanced among older youth who live in urban areas, study in humanitarian colleges, and whose mother\u2019s educational level is high. The study highlights the importance of institutionalizing the concept of gender in higher educational institutions