Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing

This paper studies how to enhance frequency response function (FRF) estimation in the presence of harmonic disturbances during operational modal testing. A novel technique which utilizes impact-synchronous time averaging (ISTA) called impact-synchronous modal analysis (ISMA) was introduced where modal analysis can be performed in the presence of ambient forces. The phase angle information of the harmonic signal at the impact events is shown to be a key factor in enhancing the effectiveness of this technique. However, lack of knowledge and control of impact with respect to the phase angle of the disturbances using conventional impact hammer in ISMA has limited the effectiveness and practicality of this novel technique. A portable and automated phase controlled impact device is introduced in the effort to eliminate non-synchronous components with minimal possible impacts applied. This device makes use of the feeding phase angle information of responses from the cyclic load back to the device and imparts the impact at the correct time/phase which is always non-synchronous with respect to the phase of response from cyclic load. A reduced number of averages thereby expedite the overall modal testing procedure, an improved of FRF estimation and a good correlation of modal extraction data with benchmark data shown in this study has highlighted the advantages of ISTA using the proposed device.     

The Political Transformation of Golf in Modern South Korea

Abstract

Since golf was introduced to South Korea in the early 1900s, it has been strongly influenced by the politics that reflects socio-political contexts. Therefore, it is important to explore the political influences of golf on the context of its socio-political transformation. In this study, we explored how social and political backgrounds under each of the political administrations have affected the development of golf in South Korea. For this purpose, we utilized the socio-historical approach through document analysis to summarize the golf-related policy stances of nine presidential administrations from the Syngman Rhee government (1948–1960) to Park Geun-hye government (2013–2017). As a result, the Syngman Rhee administration pursued the construction of golf courses to bolster national security. The military regimes of Park Chung-hee and Chun Doo-hwan constructed golf courses as a means of cementing support among military circles to establish political legitimacy, and also as a means of diplomacy. The Roh Tae-woo administration initiated a construction boom in golf courses to promote sports for all. The Kim Young-sam administration announced a ‘no golf’ stance, while Kim Dae-jung and Roh Moo-hyun-both of whom had roots in the opposition-strove to encourage golf as a means of embracing their conservative counterparts while also diluting their progressive and contrarian image. Lee Myung-bak included golf among the core strategic tourist industries, while his successor, Park Geun-hye, first prohibited public officers from playing golf before pivoting to a supportive stance later on in her administration.     

Service-Learning: Implications for the Academic,Personal, and Professional Development of Criminal Justice Majors

An exploratory senior and alumni survey was administered to better assess the experiential learning opportunities, including Service-Learning, offered to students in a criminal justice department. This article highlights the academic, personal and professional development of students, based on the perception of criminal justice majors in the department who completed a Service-Learning course. Educators continue to assess the academic outcomes for students and the benefits to the community. What may be less appreciated is how Service-Learning can also benefit students in their professional skills development. This article illustrates these potential benefits, and also discusses why Service-Learning courses are a critical part of development for criminal justice majors.     

3D thermoelasticity solutions for functionally graded thick plates

Thermal-mechanical behavior of functionally graded thick plates, with one pair of opposite edges simply supported, is investigated based on 3D thermoelasticity. As for the arbitrary boundary conditions, a semi-analytical solution is presented via a hybrid approach combining the state space method and the technique of differential quadrature. The temperature field in the plate is determined according to the steady-state 3D thermal conduction. The Mori-Tanaka method with a power-law volume fraction profile is used to predict the effective material properties including the bulk and shear moduli, while the effective coefficient of thermal expansion and the thermal conductivity are estimated using other micromechanics-based models. To facilitate the implementation of state space analysis through the thickness direction, the approximate laminate model is employed to reduce the inhomogeneous plate into a homogeneous laminate that delivers a state equation with constant coefficients. The present solutions are validated by comparisons with the exact ones for both thin and thick plates. Effects of gradient indices, volume fraction of ceramics, and boundary conditions on the thermomechanical behavior of functionally graded plates are discussed.     

Use of NSE/PS2m-transgenic mice in the study of the protective effect of exercise on Alzheimer's disease

In its late stage, Alzheimer's disease results in progressive muscle weakness in the arms and legs. The aim of this study was to determine whether mice expressing the skeletal muscle-specific mutant PS2 gene (a model of Alzheimer's disease) are a useful experimental system to study the protective effect of exercise on Aβ-42 reduction, improvement of behavioural function and changes in metabolic parameters. With this aim in mind, the transgenic mice were subjected to treadmill exercise for 3 months. The results showed that in transgenic mice, but not in normal mice, treadmill exercise resulted in a reduction of Aβ-42 deposits and an improvement in behavioural function, thereby restoring normal concentrations of total cholesterol, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol and triglyceride. Thus, exercise may represent a practical therapeutic strategy for use with human patients with Alzheimer's disease.     

Modern Weightlifting and Emerging Communities of Malayan and Singaporean Weightlifters during Pre-Second World War and Post-War British Colonial Rule, 1900s–1959: Competing in the Asian Games,Empire and Commonwealth Games,and Olympic Games

British Malaya consisted the Straits Settlements (Penang, Malacca, and Singapore), Federated Malay States (Perak, Selangor, Negri Sembilan, and Pahang), and the Unfederated Malay States (Perlis, Kedah, Kelantan, Trengganu, and Johore). This study attempts to document the development of weightlifting into two periods. During the first period of the early twentiethcentury the wealthy Straits Chinese community promoted weightlifting in the Penisula. As the Malayan economy grew and produced a working class population, the other Chinese and Malay communities set up clubs to practice weightlifting. The Singapore Amateur Weight Lifting Federation (SAWLF) was founded in 1934 to organize competitions according to the British Amateur Weight Lifting Association (BAWLA) regulations. In 1936 a Chinese weightlifter represented China at the 1936 Olympic Games. The second period occurred after the Japanese occupation (1942–1945). Singapore was separated from the rest of British Malaya in 1946. The Singapore Olympic and Sports Council (SOSC) was established in 1947. The Federation of Malaya Olympic Council was founded in 1953 and Malayan Amateur Weight Lifting Federation (MAWLF) in 1955. The Malayan and Singapore weightlifters competed separately at the Asian Games, Empire and Commonwealth Games, and the Olympic Games. Later, Malaya and Singapore became independent states in 1957 and 1959.     

Stakeholders’ perceptions and recommendations of a high school leadership development programme for athletes in Singapore

ABSTRACT

This study examined the perceptions of key stakeholders of a high school athlete leadership development training programme. Participants included 36 athletes (males = 23, females = 13) from two team sports (rugby n = 11 and volleyball n = 6) and two individual sports (bowling n = 8 and table tennis n = 11), as well as four coaches representing each of these sports and four teachers. Individual interviews were conducted for coaches, teachers, and athlete leaders, while athletes took part in focus group interviews. Inductive thematic analysis was used to analyse all data sets. Results showed that the athlete leadership programme developed qualities such as responsibility, role modelling, motivation, communication, perseverance, and team unity that would help athlete leaders perform their roles and responsibilities. The results also highlighted some limitations including earlier involvement from key stakeholders, tailored training for athlete leaders, and a more effective transfer of learning.     

Educational Practice in Leadership Mentoring: The Singapore Experience

Findings of a study on the practice of school management learned through mentoring reveal that leading surfaced prominently as the prime aspect of what could be learned through formal mentoring and could be put into practice on the job. These principals, who have the opportunity to learn through mentoring, suggest their learning and practice of leading primarily through relating with people. The three features involved are: leading through relating with people actively, promoting trust in relating with people, and serving as worthy models in their dedication to service. As such, the learning of leading through formal mentoring could be of significance in the professional development of aspiring principals. It highlights a known practice of leading, learned through leadership mentoring, for an unknown future. This revised version was published online in August 2006 with corrections to the Cover Date.