Assessing Economic Value of Reducing Perceived Risk in the Sharing Economy: The Case of Ride-sharing Services

This study examines what types of perceived risks influence consumers’ and non-consumers’ willingness to pay for ride-sharing services as a representative of the sharing economy. Choice experiment models are constructed to capture consumers’ and non-consumers’ perceptions of the relative importance of each service attribute reducing perceived risk. Results show individuals’ utility significantly increases when the service does not require private information from consumers, provides a driver-tracking system, requires a commercial driver’s license from drivers, offers a driver-review system, comprehensively compensates for negative incidents, and guarantees a minimum wage and benefit plan for drivers. This research contributes to a deeper understanding of the role of perceived risk in the sharing economy, and suggests theoretical and practical implications that can assist companies and policy makers

THE STATUS OF HAIR MINERALS IN CHRONIC FATIGUE AND DEPRESSED WOMEN

Objective: Chronic fatigue and depression are common problems in primary care. The status of micronutrients may be related to two conditions. The present study aimed to identify the association of minerals with chronic fatigue and depression.Methods: We conducted a cross-sectional study using medical records of 97 female patients aged 20–64 years old who visited the integrated medical center of a university hospital in Gyeongju, South Korea, from 2013 to 2016. Collected information comprised their scores for the fatigue severity scale, beck depression inventory, and concentrations of mineral in hair samples.Results: The subjects were classified into three groups according to their depression and fatigue scores: 21 patients (21.6%) were free of fatigue and depression, 55 (56.8%)experienced fatigue without depression, and 21 (21.6%) experienced fatigue with depression. The potassium (K) concentration in hair significantly decreased in the groups of fatigue or fatigue with depression compared to the group with free of fatigue and depression (p=0.042). The trend of sodium (Na), K concentration, and Na/magnesium (Mg) ratios in hair gradually decreased with fatigue and depression (p for trend=0.027, 0.037, and 0.03).Conclusion: Chronic fatigue and depression in women are associated with the concentrations of hair minerals, especially Na, K, and Na/Mg ratios

O(D,D)\mathbf{O}(D,D) Covariant Noether Currents and Global Charges in Double Field Theory

Double field theory is an approach for massless modes of string theory, unifying and geometrizing all gauge invariance in manifest $\mathbf{O}(D,D)$ covariant manner. In this approach, we derive off-shell conserved Noether current and corresponding Noether potential associated with unified gauge invariance. We add Wald-type counter two-form to the Noether potential and define conserved global charges as surface integral. We check our $\mathbf{O}(D,D)$ covariant formula against various string backgrounds, both geometric and non-geometric. In all cases we examined, we find perfect agreements with previous results. Our formula facilitates to evaluate momenta along not only ordinary spacetime directions but also dual spacetime directions on equal footing. From this, we confirm recent assertion that null wave in doubled spacetime is the same as macroscopic fundamental string in ordinary spacetime.Comment: v2) 1+42 pages, Refs added, minor changes. To appear in JHE

A simple rat model of mild traumatic brain injury: device to reproduce anatomical and neurological changes of mild traumatic brain injury

View the peer-reviewed version (peerj.com/articles/2818), which is the preferred citable publication unless you specifically need to cite this preprint. Mild traumatic brain injury typically involves temporary impairment of neurological function. Previous studies used the water pressure or rotational injury for designing the device to make a rat mild traumatic brain injury model. The objective of this study was to make a simple model of mild traumatic brain injury in rat. The device consisted of a freefall impactor that was targeted onto the rat skull. The weight (175g) was freely dropped 30cm to rat's skull bregma. We installed a safety device made of acrylic panel. (Collins et al. 1999). Actually, hospital-treated MTBIs are no more than 26 100 to 300/100,000 (Harmon et al. 2013). Neurological, cognitive and behavioral deficits, caused 27 by MTBIs, are observed only for a short period of time. A headache, vomiting, cognitive slowing, 28 fatigue, dizziness, depression, and problems with attention and memory can be one of its 29 symptoms (d'Hemecourt. 2011; 39 However, such a damaging mechanism, which delivered shock to their head and fell down them, 40 could not induce MTBIs alone. In another study, shocks were delivered to the craniums of rats 41 equipped with helmet disks, but it was also complicated to put the helmet disk (Xu et al. 2014). 42 In the case of a method suggested by Tang et al., it was comparatively simple and did not cause 43 skull fracture

Development of Ocean Economy Satellite Account in Korea

The ocean has emerged as a new solution to new growth engines. However, some issues remain to be resolved, such as unified concepts and evaluation methods for the ocean economy, comparability between the national economy and the ocean economy, and the connection between global and national assessments. Since the ocean economy comprises various complex industries, it is necessary to establish policies based on an objective analysis of economic indicators. However, there have been difficulties in analyzing industrial activities related to the ocean economy within the national account system. To more accurately calculate the share of the ocean economy sector in the national economy, it is necessary to create a satellite account that reflects the characteristics of the ocean economic activities while maintaining consistency with the national account. This study aims to develop a satellite account for the ocean economy, a measurement of GDP in the ocean sector, which can correspond with the national accounts system and intends to propose Korean practices as a framework in the process of discussing international guidelines. This study introduces a potential structure for Korea\u27s ocean economy satellite account, the principles, methods, and data used for value coefficient estimation, and finally presents pilot results for several components of the ocean economy. This account can be utilized to diagnose the economic position as well as the policy effects of Korea’s ocean economy sector while contributing to the establishment of mid-to-long term industrial policies. This case study of Korean practices can be an important example that offers a framework and principles for international discussions

The comparison of the aid allocation of Korea in the 1950s and the 1960s to that of contemporary Uganda

노트 : Prepared for Korea and World Economy Conference X