The Relationship Between Positive Psychological Capital and Job Burnout: A Study of Thai Airways International Flight Attendants

This study investigates the relationship between levels of positive psychological capital (PsyCap) and burnout among Thai flight attendants who are currently working for Thai Airways International. The sample included 305 flight attendants. The results indicate that the perceptions of their burnout level is low (mean = 2.10), and degree of their PsyCap is moderate (mean = 3.73);the aggregate of PsyCapand the burnout levels are found to be significantly negative (r =-0.42). All four components of PsyCap are negatively related to the level of burnout. The paper discusses the future research agenda. The implications of these findings and benefits of developing PsyCap for organisations are also discussed in the light of these findings.

A New Design of Robust H∞Load-Frequency Controller for Optimal Coordination of Energy Generation in Power System Stability Using LMI Approach

This paper presents the problem of robust H∞?load frequency controller design and robust H￥ based approach called advanced frequency control (AFC). The objective is to split the task of balancing frequency deviations introduced by renewable energy source (RES) and load variations according to the capabilities of storage and generators. The problem we address is to design an output feedback controller such that, all admissible parameter uncertainties, the closed-loop system satisfies not only the prespecified H∞? norm constraint on the transfer function from the disturbance input to the system output. The conventional generators mainly balance the low-frequency components and load variations while the energy storage devices compensate the high- frequency components. In order to enable the controller design for storage devices located at buses with no generators, a model for the frequency at such a bus is developed. Then, AEC controllers are synthesized through decentralized static output feedback to reduce the complexity. The conditions for the existence of desired controllers are derived in terms of a linear matrix inequality (LMI) algorithm is improved. From the simulation results, the system responses with the proposed controller are the best transient responses.

Jpowder Version 2: For the Display and Examination of Powder Diffraction Data Using Stack Plot

The ability to display and inspect powder diffraction data quickly and efficiently is a central part of the data analysis process. Whilst many computer programs are capable of displaying powder data, their focus is typically on structure solution. The research proposes a lightweight powder diffraction visualization program with the capability of fast rendering to compare powder data sets. Based on the success of the earlier version and user requests, Jpowder has been extended to display powder diffraction datasets using stack plot, which options to use meta-data for crystallographic powder diffraction data in XML format. Such stack plots allows crystallographers to identify phase transitions in materials.

An Exploratory Factor Analysis of Quality of Work Life of Pilots

This study aims to explore dimensions of quality of work life (QWL) of pilots by using an exploratory factor analysis (EFA). The sample was 400 pilots who are currently working for an airline based in Thailand. The items using in this study were generated using input from three sources. First, using input from commercial pilots who had a minimum of total 5,000 flying hour and currently working for either premium or low cost airlines in Thailand. Second, translated quality of work life items from a published research on Quality of Work Life of Personnel at Dhurakij Pundit University by Chatthai (2016). After the content analysis, the left items for the EFA analysis were 30 items. The Kaiser-Meyer-Olkin (KMO) demonstrated at 0.93. The exploratory factor analysis was to examine the loading patterns of QWL items. A principal component and orthogonal rotation (Verimax method) were chosen. It showed there were five structural factor patterns. The five factors were labored as “Human Resource Management”;“Social Relation”;“Safe Working Environment”;“Work-Life Balance”;and “Fairness and Respect”. Discussion and future research are also discussed.

Presence of Cryptosporidium parvum and Giardia lamblia in water samples from Southeast Asia: towards an integrated water detection system

Background:Access to clean and safe drinking water that is free from pathogenic protozoan parasites,especially Cryptosporidium parvum and Giardia lamblia that cause gastrointestinal illness in humans,is still an issue in Southeast Asia(SEA).This study is the first attempt to detect the aforementioned protozoan parasites in water samples from countries in SEA,using real-time polymerase chain reaction(qPCR)assays.Methods:A total of 221 water samples of 10 l each were collected between April and October 2013 from Malaysia(53),Thailand(120),the Philippines(33),and Vietnam(15).A physicochemical analysis was conducted.The water samples were processed in accordance with the US Environmental Protection Agency’s methods 1622/1623.1,microscopically observed and subsequently screened using qPCR assays.Results:Cryptosporidium oocysts were detected in treated water samples from the Philippines(1/10),with a concentration of 0.06±0.19 oocyst/L,and untreated water samples from Thailand(25/93),Malaysia(17/44),and the Philippines(11/23),with concentrations ranging from 0.13±0.18 to 0.57±1.41 oocyst/L.Giardia cysts were found in treated water samples from the Philippines(1/10),with a concentration of 0.02±0.06 cyst/L,and in untreated water samples from Thailand(20/93),Vietnam(5/10),Malaysia(22/44),and the Philippines(16/23),with concentrations ranging from 0.12±0.3 to 8.90±19.65 cyst/L.The pathogens C.parvum and G.lamblia were detected using using qPCR assays by targeting the 138-bp fragment and the small subunit gene,respectively.C.parvum was detected in untreated water samples from the Philippines(1/23)and Malaysia(2/44),whilst,G.lamblia detected was detected in treated water samples from the Philippines(1/10)and in untreated water samples from Thailand(21/93),Malaysia(12/44),and the Philippines(17/23).Nitrate concentration was found to have a high positive correlation with(oo)cyst(0.993).Conclusion:The presence of(oo)cysts in the water samples means that there is potential risk for zoonotic disease transmission in the studied countries.Detection using qPCR is feasible for quantifying both pathogenic C.parvum and G.lamblia in large water samples.

Multi-wavelength erenkov radiations in a microring resonator in combination with two gratings

In this paper,the erenkov radiation of light pulse in a microring and gratings is simulated and investigated.The system design consists of a two-defect grating incorporating a microring,connected with a uniform grating.In simulation,the continuous wave(CW) light pulse with wavelength centered at 1.55 μm is input into the microring device via the two-defect grating.The resonant outputs from the two-defect grating propagate through the microring and uniform grating,where the time delays of those two input pulses with different wavelengths through the system are distinguished by the output uniform grating.From the obtained resonant output pulses,we find that the red-shifted and blue-shifted erenkov pulses are observed.In applications,such a proposed system can be used to form two different optical delay pulses,in which the change in erenkov radiation of them,i.e.,time delay within a microring device system,can be useful for erenkov radiation imaging and sensing applications.