• Journal of the Korean Society of Safety
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• v.34 no.6
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• pp.76-87
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• 2019

This study was conducted to check the cabin crew's safety perception in relation to the airline's safety climate and cabin crew's safety action and to verify that the safety perception's mediation effects. The results of the study confirmed that all three factors of the safety climate have a significant impact on safety perception, and among them, safety practice is the most significant. Accordingly, Airlines need to establish a community that enables real-time information exchange for air accidents so that the cabin crew can present real-time examples of safety-related accidents. In addition, it will be necessary to work with external safety agencies to form an active attitude for the establishment of safety procedures in order to prevent recurrence of safety problems while considering the causes of such incidents internally in the event of an airline safety accident. In addition, it was confirmed that safety training was the most significant factor to safety action, among which all three elements of the safety climate had a significant effect on safety action. Therefore, airlines need to expand practical training on aircraft to full-scale safety training to build an immediate resolution for cabin crews in the event of an air accident. In addition, safety training should be established to encourage collaboration among aviation safety-related personnel to participate in safety training together to address aviation safety from a diverse point of view. Safety perception was has a significant effect on safe action. Therefore, airlines should reinforce the airline's safety management system by checking the status of the cabin crew's safety perception extending the level of punishment to the scope of retirement or disqualification to establish a firm awareness of safety. Finally, the safety perception has demonstrated partial mediation effects in relation to the safety climate and safety action. Therefore, the airline needs to improve the duties of the cabin crew that interferes with cabin safety duties. In addition, airlines should utilize advertisements emphasizing that safety is first.

• Journal of Technologic Dentistry
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• v.37 no.2
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• pp.79-94
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• 2015

Purpose: The main purposes of this study are to describe the organization effectiveness and to investigate the effects of dental technicians' work ethic on job satisfaction, organization citizen's action, and organizational commitment. Methods: A total of 300 dental technicians working at dental laboratories in the Daegu area were randomly selected and surveyed, 298 of them were used for the statistical analysis. Results: The work ethic sub-items, such as industry, work centrality, morality, time save, independence, and relation with co-worker are independent variables. The organization effectiveness subi-items, such as job satisfaction, organization citizen's action, and organizational commitment are dependent variables. Sociodemographic variables are used for control variables. Findings are as follows: First, in terms of dental technicians' work ethic, the level of relation with coworker was the highest, and work centrality was the lowest. Second, in terms of dental technicians' organization effectiveness, the level of citizen's organizational action was the highest followed by organizational commitment and job satisfaction in order. Third, the effects of industry, work centrality, time save, relation with coworker, and morality showed statistically significant relationships with organizational effectiveness. Fourth, the effects of industry, work centrality, time save, relation with co-worker, and morality statistically significant relationships with job satisfaction. Fifth, in terms of organization citizen's action, the effects of industry, work centrality, and time save were statistically significant. Sixth, work centrality, time save, relation with coworker, and independence were statistically significant with organizational commitment. Conclusion: Some policy implications for the improvement of organizational effectiveness are introduced and discussed. Dental technicians are required to have vocation and work ethic for themselves and the organization, and by doing so, they may contribute to the improvement of national oral health. Policies and educational programs, which can support them may be necessary.

• Journal of the Korean Society of Earth Science Education
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• v.17 no.1
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• pp.70-85
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• 2024

The purpose of this study was to find out what impact climate action has on study participants and why climate action education is difficult in high schools. For this purpose, a basic qualitative research method was selected, and the study participants were five middle school students at the time of the activity. The results of this study are as follows. Due to the climate action in middle school, the participants' career path changed specifically and their climate literacy was cultivated. And climate action education in high schools was not enough. Environmental subjects that provide climate action education were difficult to open because they were not chosen by many students, and it was unrealistic to provide climate action education during creative experiential activities due to the burden of college entrance exams. The discussion points of this study are as follows. Climate action needs to be encouraged among middle school students because it helps shape career paths and cultivate climate literacy. Additionally, because sustainability is important in climate action, there is a need to establish specialized courses in climate action education in the curriculum of elementary, middle, and high schools so that climate literacy can be maintained consistently.

• Bulletin of the Korean Mathematical Society
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• v.38 no.4
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• pp.741-751
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• 2001

In this paper when $(M, \omega)$ is a compact weakly exact symplectic manifold with nonempty boundary satisfying $c_1｜{\pi}_2(M)$ = 0, we construct an action spectrum bundle over the group of Hamil-tonian diffeomorphisms of the manifold M generated by the time-dependent Hamiltonian vector fields, whose fibre is nowhere dense and invariant under symplectic conjugation.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.37 no.4
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• pp.220-225
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• 1988

A class of adaptive controllers with integral action is proposed, which may riject the offset due to any load disturbance on the plant. Effective integral action and robust identification against the offset can be achieved via the zero-gain predictor. The system is improved, in this paper, to be of more generalized structure, and the detuning control weight which can cope with nonminimum-phase systems is tuned on-line. Discrete-time versions of the improved system are developed, which may be more flexible for the choice of the design parameters. The resulting control systems may also be shown to be robust to the unmodelled dynamics.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.16 no.4
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• pp.270-275
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• 2016

We present an approach for acceleration actor-critic algorithm for reinforcement learning with continuous action space. Actor-critic algorithm has already proved its robustness to the infinitely large action spaces in various high dimensional environments. Despite that success, the main problem of the actor-critic algorithm remains the same-speed of convergence to the optimal policy. In high dimensional state and action space, a searching for the correct action in each state takes enormously long time. Therefore, in this paper we suggest a search accelerating function that allows to leverage speed of algorithm convergence and reach optimal policy faster. In our method, we assume that actions may have their own distribution of preference, that independent on the state. Since in the beginning of learning agent act randomly in the environment, it would be more efficient if actions were taken according to the some heuristic function. We demonstrate that heuristically-accelerated actor-critic algorithm learns optimal policy faster, using Educational Process Mining dataset with records of students' course learning process and their grades.

• Korean Journal of Pharmacognosy
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• v.18 no.1
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• pp.14-25
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• 1987

The effects of the water extract of 'Banhahubagtang', the combined herbal medicine, on the low esophageal sphincter, stomach, small intestine and CNS were investigated, and the results were as follows: The hexobarbital induced sleeping time was prolonged in female mice. The convulsion induced by electric shock was suppressed and analgesic action was recognized in mice. The extract inhibited intestinal propulsion of barium sulfate in mice. The extract inhibited free acid secretion and showed remarkable suppression of gastric ulcer in rats. Relaxation induced by isoproterenol and norepinephrine in low esophageal sphincter(L.E.S.) of rabbit was potentiated by addition of the extract. In conclusion, the Banhahubagtang exhibited anticonvulsive, sedative and L.E.S. inhibitory activities. These experimental results might indicate to be coincided with the indications for neuro-esophago-stenosis, esophagitis, esophagia, gastralgia, and neurosis which are well referred to the literature of oriental medicine.

• Korean Institute of Interior Design Journal
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• v.22 no.6
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• pp.98-107
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• 2013

Space evolves from the concept of deterministic static location to a dynamic, connected area through the interference of the user. While this does incorporate physical changes of the space, it also reflects the changes of the program or characteristics of the space through the actions and changes of the user. Therefore, in this study we plan to review the characteristic of time appearing within space, thereby discussing the impact of changing of condition in time-space to the decision making of the user. Further, we plan to analyze the specific causes, and subsequently introduce a new perspective over space. In order to achieve this, we need to first understand the reason why the attribute of time needs to be discussed in space, and perform a fundamental analysis of factors for the changes of the users' actions following changes in space-time condition. This means that space is not limited to merely satisfying its innate objective as an area, but may have a basis for modifying its role to help the decision making of the users caused by changes in space-time conditions. Accordingly, we analyze the factors for change of environment that can appear in space following the flow of time caused by correlation in space-time, as well as psychological factors and variables for decision making by the users. Based on this, we analyze cases to study the influence of condition changes in time-space on the action decision judgment of the users. Through this, we propose that the actions of the users can be determined following changes in time-space conditions, and discuss the need for changes in our perspective of space.

• ETRI Journal
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• v.39 no.4
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• pp.502-513
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• 2017

For video understanding, namely analyzing who did what in a video, actions along with objects are primary elements. Most studies on actions have handled recognition problems for a well-trimmed video and focused on enhancing their classification performance. However, action detection, including localization as well as recognition, is required because, in general, actions intersect in time and space. In addition, most studies have not considered extensibility for a newly added action that has been previously trained. Therefore, proposed in this paper is an extensible hierarchical method for detecting generic actions, which combine object movements and spatial relations between two objects, and inherited actions, which are determined by the related objects through an ontology and rule based methodology. The hierarchical design of the method enables it to detect any interactive actions based on the spatial relations between two objects. The method using object information achieves an F-measure of 90.27%. Moreover, this paper describes the extensibility of the method for a new action contained in a video from a video domain that is different from the dataset used.

• Biomolecules & Therapeutics
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• v.9 no.3
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• pp.209-217
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• 2001

This study was attempted to investigate on renal effect of ($\pm$)6-chloro-7,8-dihydroxy-1-phenol 2,3,4,5-tetrahydro-lH-3 benzazepine (SKF 81297), dopamine $D_1$ receptor agonist, in dog. SKF 81297, when gluten intravenously, produced diuretic action along with the increases of renal plasma flow (RPF), glomerular filtration rate (GFR), amounts of N $a^{+}$ and $K^{+}$ excreted into urine ( $E_{Na}$ , $E_{K}$) and osmolar clearance ( $C_{osm}$). It also decreased the reabsorption rates of N $a^{+}$ and $K^{+}$ in renal tubule ( $R_{Na}$ , $R_{K}$) and free water clearance ( $C_{H2O}$), whereas ratios of $K^{+}$ agonist N $a^{+}$ in urine and filtration fraction (FF) was not changed. SKF 81297, when administered into a renal artery, elicited diuresis both in experimental kidney given the SKF 81297 and control kidney not given, while the effect was more remarkable in experimental kidney than those exhibited in control kidney. SKF 81297 given into carotid artery also exhibited diuresis, the potency at this time, compared to those induced by intravenous SKF 81297, was magnusgreat. Above results suggest that SKF 81297 produces diuresis by both indirect action through changes of central function and direct action being induced in kidney. Central diuretic action is mediated by improvement of renal hemodynamics, but direct action by inhibition of electrolytes reabsorption in renal tubule.enal tubule. tubule.