• Journal of the Society of Disaster Information
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• v.13 no.2
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• pp.191-198
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• 2017

Lego block system forms a temporary pavement area using the assembled structure block in the road excavation work for the maintenance and installation of facilities. This system was developed for a safe passage of vehicles and pedestrians. A study on the fundamental performance of a lego block system was performed through material quality, sliding resistance and compression tests. And compaction performance of ground on the road was reviewed and evaluated through field tests. As a result, a lego block system for road recovery showed the excellent performance and compaction effect.

• Korean Journal of Social Welfare
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• v.40
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• pp.68-96
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• 2000

Parental leave in Sweden is a part of the health insurance in national social insurance system. It has two kinds of benefits. One is parental cash benefit paid for both husband and wife on the occasion of child birth, currently 450days for each child. The other is temporary parental cash benefit when a child under the age of twelve or a caretaker for him is illness, which is six months for a child a year. Parental insurance in Sweden permits parents to take care of their children just after birth at home with the amount of 80% of monthly income for 360 days and 60 Swedish krone each day for 90 days more. It also permits parents with children under the age of eight of part-time work and return to former job at full-time base when they want. It consequently encourages women's economic activity in her whole life and contributes to promotion of equality in sex roles between husband and wife. This insurance scheme is beneficient in that it enhances individual and family welfare and also secures labour force. This case study on Swedish parental insurance offers implication how to resolve the conflict between women's increased demand for economic activity and maternal role.

• The Korean Journal of Emergency Medical Services
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• v.19 no.2
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• pp.51-69
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• 2015

Purpose: This study aimed to identify the effects of job insecurity and job engagement on turnover intention of paramedics who work in emergency medical institutions. Methods: From October 14 to 28, 2014, data were collected by structured questionnaires from 171 paramedics who were working in emergency medical institutions. The data were analyzed by using SPSS/WIN 21.0. Results: Of the 171 subjects, 57.3% were temporary employees, of whom 87.5% were working in regional emergency medical centers. The mean scores were 3.19 for job insecurity, 4.58 for job engagement, and 3.28 for turnover intention. The correlation between the variables showed that the higher the job insecurity of the participants, the higher their turnover intention (r = .397, p <.001). Moreover, the higher their job engagement, the lower their turnover intention (r = -.354, p <.001). The variable that most significantly affected turnover intention was job insecurity. The coefficient of determination ($R^2$) of job insecurity and job engagement was 24.3%. Conclusion: A law should be enacted to involve paramedics as required personnel for emergency medical institutions in order to enhance the quality of emergency medical services and provide prompt and professional emergency medical services to emergency patients.

• Journal of Technologic Dentistry
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• v.43 no.1
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• pp.13-18
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• 2021

Purpose: This study aimed to compare the flexural properties and perform the Weibull analysis of photo-curing three-dimensional (3D) printing resin. Methods: Photo-curing temporary resin (3D polymer) was used as a printing resin. Specimens (65 × 10 × 3.3 ㎣) were prepared following the ISO 20975-1 guidelines and according to the different printing orientations using a digital light processing 3D printer (D2 120; Dentium). The flexural strength (FS), flexural modulus, and work of fracture (WOF) were measured using a universal testing machine (Instron 3344; Instron) at a crosshead speed of 5 mm/min. Results: In this study, the 0° orientation exhibited higher FS and WOF than the 45° orientation. Significant differences were found among the printing orientations (p<0.05). Specimens printed at the 0° orientation were the most accurate. In the Weibull analysis, 0° showed the greatest Weibull modulus (m), which represents a higher reliability. Conclusion: 3D printing should be selected and used by considering flexural properties, size accuracy, and reliability.

• Journal of Information Processing Systems
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• v.17 no.6
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• pp.1097-1114
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• 2021

The primary objective of this work was to discover a solution for the survival of people in an emergency flood. The geographical information was obtained from remote sensing techniques. Through helpline numbers, people who are in need request support. Although, it cannot be ensured that all the people will acquire the facility. A proper link is required to communicate with people who are at risk in affected areas. Mobile sensor networks with field-programmable gate array (FPGA) self-configurable radios were deployed in damaged areas for communication. Ad-hoc networks do not have a centralized structure. All the mobile nodes deploy a temporary structure and they act as a base station. The mobile nodes are involved in searching the spectrum for channel utilization for better communication. FPGA-based techniques ensure seamless communication for the survivors. Timely help will increase the survival rate. The received signal strength is a vital factor for communication. Cognitive radio ensures channel utilization in an effective manner which results in better signal strength reception. Frequency band selection was carried out with the help of the GRA-MADM method. In this study, an analysis of signal strength for different mobile sensor nodes was performed. FPGA-based implementation showed enhanced outcomes compared to software-based algorithms.

• Safety and Health at Work
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• v.13 no.1
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• pp.93-98
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• 2022

Background: Despite a growing number of investigations exploring the health problems in precarious workers, there is still a paucity of studies investigating workplace violence in workers with multi-party employment arrangements (WMPEAs). This study was aimed at comparing the prevalence of workplace violence between non-WMPEA and WMPEA. Methods: The 5th Korean Working Conditions Survey data were used. The study subjects were employees aged 20-74, with 26,239 non-WMPEA and 1,556 WMPEA. WMPEA included temporary agency workers and workers providing outsourced services. Workplace violence including verbal abuse, unwanted sexual attention, threats, and humiliating behaviors were used as outcome variables. The odds ratios of risk of workplace violence were calculated using multiple logistic regression. Results: The age-standardized prevalence of workplace violence was significantly higher among WMPEA. After adjusting for all covariates, the risk of workplace violence among WMPEA was still significant (OR 1.80, 95% CI 1.5-2.2) compared with non-WMPEA. The odds ratio of workplace violence among female WMPEA was 1.99 (95% CI 1.53-2.59), which is higher than that of male WMPEA (OR 1.52, 95% CI 1.18-1.96). Conclusion: We found that WMPEA were exposed to higher risk of workplace violence. Discrimination against WMPEA in the working environment and management policy need to be corrected. It is also necessary to identify the risk factors of workplace violence in WMPEA and to make efforts to prevent violence.

• International conference on construction engineering and project management
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• 2009.05a
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• pp.218-223
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• 2009

During the process of excavation for substructures of buildings, precise and constant measurements of retaining wall displacement is crucial for construction to be complete and safe. Currently an inclinometer is used to measure displacement around the perimeter of an excavation site. The existing inclinometer system requires an instrument to be placed inside pre-bored holes for each measurement with an typical interval of two weeks. This makes it difficult to obtain continuous displacement data, especially during a critical time such as rainy season in summer. Also, the existing inclinometer is placed at certain distance away from the retaining wall system itself. Thus, exact measurement of retaining wall movement is compromised because of the distance between the retaining wall and the inclinometer. This paper presents the development of wireless inclinometer system for the displacement measurement of retaining walls by being attached directly to the retaining wall. The result of the application of the developed systems are provided with advanced ubiquitous sensor network (USN) system features. The USN technique incorporated into the system enables users to monitor movement data from wherever possible and convenient such as construction manager's office on site or any other places connected through internet. The research work presented in this paper will provide a basis to save construction time and cost by preventing safe-related unexpected delay of construction due to the failure or collapse of retaining walls.

• Proceedings of the Korean Nuclear Society Conference
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• 1995.10a
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• pp.403-410
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• 1995

A loss of the residual heat removal (RHR) accident during mid-loop operation of Yong-gwang Nuclear Units 3/4 was analyzed using the RELAP5/MOD3.1.2 code. In this work the following assumptions are used; (i) initially the reactor coolant system (RCS) above the hot leg center line is filled with nitrogen gas, (ii) two 3/4-inch diameter vent valves on the reactor vessel head and the top of pressurizer in the reactor coolant system are always open, and a level indicator is connected to the RMR suction line, (iii) the two steam generators are in wet layup status and the steam generator atmospheric dump valve assemblies are removed so that the secondary side pressure remains at nearly atmospheric condition throughout the accident, and (iv) the loss of RHR is presumed to occur at 48 hours after reactor shutdown. Findings from the RELAP5 calculations are (i) the core boiling begins at ∼5 min, (ii) the peak RCS pressure is ∼3.0 bar, which implies a possibility of temporary seal break, (iii) ∼94 % of the decay heat is removed by reflux condensation in the steam generator U-tubes in spite of the presence of noncondensable gas, (iv) the core uncovery time is evaluated to be 7.2 hours. Significant mass errors were observed in the calculations.

• Journal of the Korean Institute of Rural Architecture
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• v.24 no.2
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• pp.53-61
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• 2022

In order to understand the physical condition and spatial deformation of houses in rural areas in Hodang Village, Ipjang-myeon, Cheonan-si, a rural area with a good settlement environment, physical characteristics and spatial deformation were identified. First, looking at the construction pattern of houses in rural areas, there have been many houses built since the 1990s, and the modernized spatial composition of urban houses appeared. Second, due to the nature of rural housing, work space and residential space are mixed, and it was analyzed that space is used through renovation to solve this problem. Third, Hodang Village was analyzed as an area with good living services, but as a result of the village survey, the proportion of vacant houses was high at 14 (42.4%). This study is conducting continuous rural housing research, rather than a temporary study on rural housing and vacant houses, based on the problems that have been drawn from previous research and existing fact-finding studies.

• Journal of the Korean institute of surface engineering
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• v.57 no.1
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• pp.49-56
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• 2024

Superhydrophobic surfaces have been expected to be able to provide considerable performance improvements and introduce innovative functions across diverse industries. However, representative methods for fabricating superhydrophobic surfaces include etching the substrate or attaching nanosized particles, but they have been limited by problems such as applicability to only a few materials or low adhesion between particles and substrates, resulting in a short lifetime of superhydrophobic properties. In this work, we report a novel coating technique that can achieve superhydrophobicity by electrophoretic deposition of aluminum nitride (AlN) nanopowders and their self-bonding to form a surface structure without the use of binder resins through a hydrolysis reaction. Furthermore, by using a water-soluble adhesive as a temporary shield for the electrophoretic deposited AlN powders, hierarchical aluminum hydroxide structures can be strongly adhered to a variety of electrically conductive substrates. This binder-free technique for creating hierarchical structures that exhibit strong adhesion to a variety of substrates significantly expands the practical applicability of superhydrophobic surfaces.