A Context-Aware Assisted WiFi Positioning Method

With the convenience brought by Location-based service (LBS), users’ requirements for indoor positioning accuracy are getting higher than ever. However, many traditional indoor WiFi positioning methods may result in limited positioning accuracy because of the limited information of Received Signal Strength (RSS) of WiFi signal. This paper proposed a context-aware assisted WiFi positioning method (CAA-PM), which uses context information (i.e., light and sound) to assist WiFi-RSS for indoor positioning and uses an improved variable weight dynamic KNN fingerprint identification algorithm (VWD-KNN). Finally, experiments are carried out by using the dataset collected in both a closed laboratory and an open long corridor, and it is shown that the proposed algorithm substantially improves the localization accuracy comparing with other three classical algorithms.

A 16-week intervention on mood and life quality in elderly: testing two exercise programs

El objetivo era examinar los efectos del programa de entrenamiento de fuerza (STP) y el programa de entrenamiento de componentes múltiples (MTP) en los estados de ánimo en ancianos físicamente activos. Treinta ancianos brasileños (mujeres = 21; hombres = 9) con edades comprendidas entre 65 y 75 años (66.9±4.1) con un índice de masa corporal (IMC) que varía de 25.6 a 31.0 kg/m2 (28.3±1.2), se inscribieron para la investigación. Los ancianos fueron asignados aleatoriamente en dos grupos: Programa de entrenamiento de fuerza (STP; edad = 66.7±4.4 años, IMC = 28.2±1.3 kg/m2) y Programa de componentes múltiples (MTP; edad = 67.1±3.9 años, IMC = 28.5±1,0 kg/m2). El grupo STP realizó tres sesiones de 1 hora por semana, trabajando en un rango de 3 series, 8-10 repeticiones y 2 minutos de recuperación entre series y ejercicios. El grupo MTP realizó dos tipos diferentes de sesiones de ejercicio: a) 50 minutos de Zumba©, seguidos de 5-10 minutos de ejercicios de estiramiento dinámico; b) 40 minutos de ejercicios dinámicos y estáticos de peso corporal, así como movimientos de agilidad y equilibrio. El perfil de estados de ánimo (POMS) se aplicó para evaluar el estado de ánimo al inicio y después de la intervención. No se mostró interacción significativa o efecto principal para el grupo y el tiempo para seis factores del POMS. Sin embargo, la inferencia basada en la magnitud mostró que MTP es probablemente beneficioso para reducir la fatiga. Por otro lado, MTP es posiblemente perjudicial para aumentar la confusión y reducir el vigor en comparación con STP. En términos prácticos, podemos concluir que las personas mayores físicamente activas parecen lograr una adaptación en las respuestas del estado de ánimo, minimizando los efectos adicionales de STP y MTP. The purpose was to examine the effects of strength training program (STP) and multi-component training program (MTP) on mood states in physically active elderly. Thirty Brazilian elderly (female=21; male=9) aged between 65 and 75 years (66.9±4.1) with Body Mass Index (BMI) ranging from 25.6 to 31.0 kg/m2 (28.3±1.2), were enrolled for research. The elderly were randomly assigned into two groups: Strength Training Program (STP; age=66.7±4.4 years, BMI=28.2±1.3 kg/m2) and Multi-Component Program (MTP; age=67.1±3.9 years, BMI=28.5±1.0 kg/m2). STP group performed three 1-hour sessions per week, working at a range of 3 sets, 8-10 repetitions, and 2-minute recovery between sets and exercises. MTP group performed two different types of exercise sessions: a) 50 minutes of Zumba©, followed by 5-10 minutes of dynamic stretching exercises; b) 40 minutes of body-weight dynamic and static exercises, as well as agility and balance movements. The Profile of Mood States (POMS) was applied to assess mood at baseline and post-intervention. No significant interaction or main effect for group and time was showed for six factors of the POMS. However, the magnitude-based inference showed that MTP is likely beneficial to reduce fatigue. On the other hand, MTP is possibly harmful to increase confusion and to reduce vigor when compared to STP. In practical terms, we can conclude that older people physically active seems to attain an adaptation in mood responses minimizing the additional effects of STP and MTP. O objetivo foi examinar os efeitos do programa de treinamento de força (STP) e do programa de treinamento com múltiplos componentes (MTP) nos estados de humor em idosos fisicamente ativos. Trinta idosos brasileiros (sexo feminino = 21; sexo masculino = 9) com idade entre 65 e 75 anos (66,9 ± 4,1) com índice de massa corporal (IMC) variando de 25,6 a 31,0 kg/m2 (28,3 ± 1,2) foram incluídos na pesquisa. Os idosos foram divididos aleatoriamente em dois grupos: Programa de Treinamento de Força (STP; idade = 66,7 ± 4,4 anos, IMC = 28,2 ± 1,3 kg/m2) e Programa Multi-Componente (TMF; idade = 67,1 ± 3,9 anos, IMC = 28,5) 1,0 kg/m2). O grupo STP realizou três sessões de 1 hora por semana, trabalhando em uma série de 3 séries, 8 a 10 repetições e recuperação de 2 minutos entre séries e exercícios. O grupo MTP realizou dois tipos diferentes de sessões de exercícios: a) 50 minutos de Zumba©, seguidos de 5 a 10 minutos de exercícios dinâmicos de alongamento; b) 40 minutos de exercícios estáticos e dinâmicos de peso corporal, bem como movimentos de agilidade e equilíbrio. O perfil dos estados de humor (POMS) foi aplicado para avaliar o humor na linha de base e pós-intervenção. Nenhuma interação significativa ou efeito principal para o grupo e o tempo foi demonstrado para seis fatores do POMS. No entanto, a inferência baseada em magnitude mostrou que a MTP é provavelmente benéfica para reduzir a fadiga. Por outro lado, o MTP é possivelmente prejudicial para aumentar a confusão e reduzir o vigor quando comparado ao STP. Em termos práticos, podemos concluir que as pessoas idosas fisicamente ativas parecem atingir uma adaptação nas respostas de humor, minimizando os efeitos adicionais do STP e MTP.

Dynamic Characteristics Analysis of Cable-Rib Tension Deployable Antenna

Balancing stiffness and weight is of substantial importance for antenna structure design. Conventional fold-rib antennas need sufficient weight to meet stiffness requirements. To address this issue, this paper proposes a new type of cable-rib tension deployable antenna that consists of six radial rib deployment mechanisms, numerous tensioned cables, and a mesh reflective surface. The primary innovation of this study is the application of numerous tensioned cables instead of metal materials to enhance the stiffness of the entire antenna while ensuring relatively less weight. Dynamic characteristics were analyzed to optimize the weight and stiffness of the antenna with the finite element model by subspace method. The first six orders of natural frequencies and corresponding vibration modes of the antenna structure are obtained. In addition, the effects of structural parameters on natural frequency are studied, and a method to improve the rigidity of the deployable antenna structure is proposed.