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Auditya Purwandini Sutarto,Kamarulzaman Mahmad Khairai,Muhammad Nubli Abdul Wahab 대한산업공학회 2020 Industrial Engineeering & Management Systems Vol.19 No.4
Stress-related problems experienced by blue collar workers have become one of the most prevalent health and safety risks and relate to loss of productivity or other poorer quality of work. Their inability to cope with the environmental demands leads to certain responses involving a complex interaction between physiological and psychological mechanism. This study aimed to evaluate the effect of multimodal stress management intervention at individual-level approach (biofeedback and work-life balance) on multiple outcome measures: physiological, physiological and productivity. A sample consisted of 18 female assembly-line operators who perceived extremely severe level of depression, anxiety, and stress, attended six-week heart rate variability (HRV) biofeedback and work-life balance training sessions. We found significantly improved physiological HRV physiological coherence, reduced negative emotional symptoms, and increased productivity (all p<0.01). The repeated measures correlation analysis also showed medium to strong association between all outcome measures (|rrm>0.53|). The possible mechanism of these parallel findings discussed as well as its practical implication. Nevertheless, our lack of sample and less rigorous research design limited us to infer generalizability and causality. Despite these drawbacks, our study demonstrates a potential use of combining HRV biofeedback and other stress management approach for improving worker’s overall well-being and work performance.
Strain-Induced Spin States in Atomically Ordered Cobaltites
Choi, Woo Seok,Kwon, Ji-Hwan,Jeen, Hyoungjeen,Hamann-Borrero, Jorge E.,Radi, Abdullah,Macke, Sebastian,Sutarto, Ronny,He, Feizhou,Sawatzky, George A.,Hinkov, Vladimir,Kim, Miyoung,Lee, Ho Nyung American Chemical Society 2012 NANO LETTERS Vol.12 No.9
<P>Epitaxial strain imposed in complex oxide thin films by heteroepitaxy is recognized as a powerful tool for identifying new properties and exploring the vast potential of materials performance. A particular example is LaCoO<SUB>3</SUB>, a zero spin, nonmagnetic material in the bulk, whose strong ferromagnetism in a thin film remains enigmatic despite a decade of intense research. Here, we use scanning transmission electron microscopy complemented by X-ray and optical spectroscopy to study LaCoO<SUB>3</SUB> epitaxial thin films under different strain states. We observed an unconventional strain relaxation behavior resulting in stripe-like, lattice modulated patterns, which did not involve uncontrolled misfit dislocations or other defects. The modulation entails the formation of ferromagnetically ordered sheets comprising intermediate or high spin Co<SUP>3+</SUP>, thus offering an unambiguous description for the exotic magnetism found in epitaxially strained LaCoO<SUB>3</SUB> films. This observation provides a novel route to tailoring the electronic and magnetic properties of functional oxide heterostructures.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-9/nl302562f/production/images/medium/nl-2012-02562f_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl302562f'>ACS Electronic Supporting Info</A></P>
A Multi-Objective Mathematical Model for the Population-Based Transportation Network Planning
Supat Chupradit,Mohammad A. Tashtoush,Mohammed Yousif Oudah Al-Muttar,Trias Mahmudiono,Ngakan Ketut Acwin Dwijendra,Purnima Chaudhary,Muneam Hussein Ali,Ahmed Alkhayyat,Dr. Sutarto 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.2
The current article introduces a three-objective model for the problem of location, allocation, and routing, taking into account the travel times depending on the population on the route. Objective functions include minimizing the total network transit time, maximizing travel attractiveness for travel applicants, and balanced allocation of travel appli-cants to each service area. In this research, a general form of the proposed three-objective mathematical planning model is formulated. The proposed model seeks to select a suitable place or places as places of service, allocate people or vehicles in each area to these places and determine the transportation route of each person or vehicle in each area to reach the service provider in question. Getting a direct impact of random factors and population flow on the random travel times of each bow so that all three goals are met simultaneously. The cuckoo optimization algorithm is developed to solve this model. A sample problem is also examined to show the validity and behavior of the proposed model. The numerical results indicate the high performance of the cuckoo optimization algorithm.
Zabolotnyy, V. B.,Fü,rsich, K.,Green, R. J.,Lutz, P.,Treiber, K.,Min, Chul-Hee,Dukhnenko, A. V.,Shitsevalova, N. Y.,Filipov, V. B.,Kang, B. Y.,Cho, B. K.,Sutarto, R.,He, Feizhou,Reinert, F.,Inosov American Physical Society 2018 Physical review. B Vol.97 No.20
<P>Samarium hexaboride (SmB6), a Kondo insulator with mixed valence, has recently attracted much attention as a possible host for correlated topological surface states. Here, we use a combination of x-ray absorption and reflectometry techniques, backed up with a theoretical model for the resonant M-4,M-5 absorption edge of Sm and photoemission data, to establish laterally averaged chemical and valence depth profiles at the surface of SmB6. We show that upon cleaving, the highly polar (001) surface of SmB6 undergoes substantial chemical and valence reconstruction, resulting in boron termination and a Sm3+ dominated subsurface region. Whereas at room temperature, the reconstruction occurs on a timescale of less than 2 h, it takes about 24 h below 50 K. The boron termination is eventually established, irrespective of the initial termination. Our findings reconcile earlier depth resolved photoemission and scanning tunneling spectroscopy studies performed at different temperatures and are important for better control of surface states in this system.</P>