• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.12 no.20
• /
• pp.33-38
• /
• 1989

In order to achieve the most suitable designing of shoemaking, the structure of shoemaking is described in this study by inquiring into structural and functional effects given by shoes to human feet. Also, the role of insole that is an essential portion in view of function in shoemaking is described and. for the improvement of quality the fact that selection of material of insole has an effect to quality is substantiated through experiments of adhesive tensile and absorption percentage. Though identification of the qualify of insole with the naked eyes is impossible because it is inserted between the internal layers of a shoe. It is not only an essential portion for the improvement of the quality of shoemaking but it gives an essential effect to the sanitation and health of human body(feet) when insole of lower qualify is used. In view of these the improvement and enhancement of the quality of home-made material of insole are earnestly required.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.675-676
• /
• 2007

This Paper presents circuit improvement of 345kV Bus bar protection panel by using VDD (Voltage disturbance detection) relay with distinctive ability between human error in the field test and real facility faults. Therefore, We expect that this improvement of circuit helps decrease of blackout coming from human error. In order to guarantee electric power system reliability, consistent study of human error prevention in the event of field test is necessarily required

• Journal of Advanced Marine Engineering and Technology
• /
• v.20 no.3
• /
• pp.137-143
• /
• 1996

The propulsion marine diesel engine has been widely applied with a mechanical-hydraulic governor to control the ship speed for long time. But it was recently very difficult for the mechanical-hydraullic governor to control the speed of engine under the condition of low speed and low load because of jiggling and hunting by rough fluctuation of rotating torque. To solve these problems of control systems, the performance improvement of mechanical-hydraulic governor is required. In this paper, in order to analyze the speed stability of control systems, the influence of parameters of the engine dead time, gain, damping ratio was discussed on the view of control engineering. The performance improvement of a conventional mechanical hydraulic governor is confirmed to be possible by fuzzy control scheme.

• Journal of the Korean Society for Library and Information Science
• /
• v.36 no.2
• /
• pp.89-117
• /
• 2002

The purpose of this study is to construct a model for measuring and assessing service quality in public libraries based on the theory of service quality in marketing area. Firstly the degree of importance of service factors is measured and ranked according to the value of each factor. This importance ranking indicates the order of service improvement. Secondly the correlation model between service factors and customer's satisfaction and behaviour is established and verified in statistical method. The result shows that the order of service quality factors which have influence on the customer's satisfaction and behaviour is the order of service quality factors required preferential improvement.

• Magazine of the Korean Society of Agricultural Engineers
• /
• v.43 no.6
• /
• pp.127-134
• /
• 2001

In order to expand agricultural lands in the western and southern coasts of Korean Peninsula, coarse soils excavated from hillsides have been used as fill materials for reclamation. In order to tackle with the problems and to confirm availability, research on soil improvement involve mixing cement to the fine wet soils. Required undrained shear strength$(C_u)$ for fill material was analysed to be 0.34~1.2 $kgf/cm^2$. It has been known that when cement is added to high water content marine clay its unconfined compression strength increased to 2 $kgf/cm^2$. Consolidation results show that pre-consolidation pressure increased to 1.8 $kgf/cm^2$and 3.4 $kgf/cm^2$ with the addition of 3% and 5% of cement respectively. This result shows that low-height embankments could be constructed without significant compression. Since the effectiveness of improvement may be different site by site, the mix design for each site is necessary in order to optimize it. The process is first to determine aimed shear strength and then optimum mix ratio of cement after carrying out a series of tests.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2002.10a
• /
• pp.665-672
• /
• 2002

In order to expand agricultural lands in the western and southern coasts of Korean Peninsula, coarse soils excavated from hillsides have been used as fill materials for reclamation. In order to tackle with the problems and to confirm availability, research on soil improvement involve mixing cement to the fine wet soils. Required undrained shear strength(c$\sub$u/) for fill material was analyzed to be 0.34∼1.2kg/$\textrm{cm}^2$. It has been known that when cement is added to high water content marine clay, its unconfined compression strength increased to 2kg/$\textrm{cm}^2$. Consolidation results show that pre-consolidation pressure increased to 1.8kg/$\textrm{cm}^2$ and 3.4kg/$\textrm{cm}^2$ with the addition of 3% and 5% of cement respectively. This result shows that low-height embankments could be constructed without significant compression. Since the effectiveness of improvement may be different site by site, the mix design for each site is necessary in order to optimize it. The process is first to determine aimed shear strength and then optimum mix ratio of cement after carrying out a series of tests.

• Journal of the Korean Society of Safety
• /
• v.29 no.5
• /
• pp.110-115
• /
• 2014

The construction accidents which had been on the downward trend for the past decades have increased for five consecutive years since 2008. In order to let the increasing trend of construction accident slow growing or switching to decline, various efforts are required of all members in construction industry such as government, employers, construction engineers, safety managers, construction workers, etc. Although the criteria for appointment of safety managers in construction site introduced in 1982 have contributed to prevent construction accident as a forefront for the past 30 years, it has not been a remarkable improvement in the safety manager's status and roles which have been required to change according to the changes of circumstances and environments. In associated with a newly introduced the criteria for appointment of health managers in construction site in the year 2015, the problems such as role, status, number of safety and health managers are needed to be considered comprehensively and improved widely. In this study, we propose several improvement plans which will improve the current criteria for appointment of safety and health managers in construction sites.

• Geomechanics and Engineering
• /
• v.5 no.1
• /
• pp.37-55
• /
• 2013

An important issue in the design of soil-nailing systems, as long-term retaining walls, is to assess their stability during seismic events. As such, this study is aimed at simulating the dynamic behavior and failure pattern of nailed structures using two series of numerical analyses, namely dynamic time history and pseudo-static. These numerical simulations are performed using the Finite Difference Method (FDM). In order to consider the actual response of a soil-nailed structure, nonlinear soil behaviour, soil-structure interaction effects, bending resistance of structural elements and construction sequences have been considered in the analyses. The obtained results revealed the efficiency of both analysis methods in simulating the seismic failure mechanism. The predicted failure pattern consists of two sliding blocks enclosed by three slip surfaces, whereby the bottom nails act as anchors and the other nails hold a semi-rigid soil mass. Moreover, it was realized that an increase in the length of the lowest nails is the most effective method to improve seismic stability of soil-nailed structures. Therefore, it is recommended to first estimate the nails pattern for static condition with the minimum required static safety factor. Then, the required seismic stability can be obtained through an increase in the length of the lowest nails. Moreover, placement of additional long nails among lowest nails in existing nailed structures can be considered as a simple retrofitting technique in seismic prone areas.

• International Journal of High-Rise Buildings
• /
• v.11 no.2
• /
• pp.87-102
• /
• 2022

In Japan, the population progresses to the extreme aging society and it is entering the phase of the population decrease while the population increase is continuing in the world. The construction market is expected to shrink accordingly, however the situation of labor shortage is expected to continue at a faster rate, because the aging of construction workers is progressing and new younger labor force cannot be secured. In order to supplement the labor shortage, it is required to progress mechanization, automation, labor saving, and efficiency improvement by utilizing the information well in each stage in a series of flow of planning, design, construction, operation, and disassembly in one building. The measures to maintain and expand the construction market by the new efficiency improvement techniques which enhance the utilization degree of building information are required. Currently, the elemental technologies which utilized BIM (Building Information Modeling) are accumulated by advancing digitization in each phase. DX (Digital transformation) in the construction industry can be achieved by the technology maturing and having a series of continuities. It is anticipated that this will evolve to a new method which is unprecedented. Present status of BIM and mechanized constructions in Taisei Construction are introduced, and future prospect is described.

• Journal of Technologic Dentistry
• /
• v.10 no.1
• /
• pp.171-175
• /
• 1988

A good material selection and high dental techniques shall be required in all procedure from waxing up to investing of wax patten in order to get a cast restoration with good adaptability. Generally, wax and investing material should not have any deformation property but they art not so perfact in practice. Therefore, as the one of methods to produce more perfact, less deformation property and excellent product, it is necessary to eliminate the problems which can cause a deformation in each procedure.