• Geomechanics and Engineering
• /
• v.20 no.6
• /
• pp.497-503
• /
• 2020

In the Kingdom of Saudi Arabia, the shallower depth of the earth's crust is composed of loose dune or beach sand with soluble salts. The expansive behavior of salt bearing soil, fluctuation of ground water table and extreme environmental conditions offer a variety of geotechnical problems affecting safety and serviceability of the infrastructure built on it. Despite spending money, time and other resources on repair and rehabilitation, no significant attention is paid to explore the root causes of excessive differential settlement and cracking to these facilities. The scientific solution required to ensure safety and serviceability of the constructed infrastructure is to improve the strength and durability properties of the supporting ground. In this study, shredded plastic is employed as a low cost and locally available additive to improve strength characteristics of the desert sand. The study shows a remarkable increase in the shear strength and normal settlement of the soil. A seven (07) degree increase in angle of internal friction is achieved by adding 0.4 percent of the shredded plastic additive. The effect of different proportions and sizes of the plastic strips is also investigated to obtain optimum values. Such a long-lived solution will seek to reduce maintenance and repair costs of the infrastructure facilities laid on problematic soil along with reduction of environmental pollutants.

• Journal of Korean Society for Geospatial Information Science
• /
• v.6 no.1 s.11
• /
• pp.91-103
• /
• 1998

This paper deals with the building of road facility management system lot the efficient and scientific management of road infrastructure by making use of Database with a variety of biridge and tunnel - related informations such as maps, registers and documents(graphical and nongraphical data). The main objectives of the creating of the Database are the rational maintenance planning for facilities and the systematization of information management through the fast updating, mending and supplement. Some actual data sourced from the administrative office could be tested in order to validate this road facility management system and we could acquire many valuable results. Therefore we can expect to play an important role of results in the practical use for the management of the various md facilities.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.27 no.10
• /
• pp.506-514
• /
• 2015

During the progression of this study, we visited 17 medical institutions. These medical institutions underwent inspection for facility eligibility of national inpatient isolation units to care for patients. Seventeen consultation meetings were held to gather expert opinions, and conferences were held with the medical institutions and local levels of government. Based on these facts, we established a field application model of the criteria of safety-management and conducted a study on this method in order to create more scientific and systematic safety-management criteria including criteria regarding facilities maintenance and methods of equipment inspection. According to an analysis on the 17 medical institutions examined, facility eligibility of 17 national inpatient isolation units was found to be 78.3% on average. Through analysis of the present domestic and foreign conditions of medical institutions, we proposed improvements for when remodeling becomes necessary and established criteria for safety-management in national inpatient isolation units for the care of patients in accordance with the domestic healthcare system.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.18 no.4
• /
• pp.325-333
• /
• 2000

This paper deals with real time building of route and vertical alignment information system for the efficient and scientific management using GSIS. First, we redesigned route and vertical alignment for obtained basic data using road projector(road design main software). Using by these acquired result, we made a database on road plan and vertical alignment drawing as a basic information being used to construction of road complex information system. The main objectives in this study are the rational maintenance road planing for drawings, its database and the systematization of route information management through the fast updating, mending, supplement. Result of this study enables us to manage route information.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• 2007.11a
• /
• pp.13-18
• /
• 2007

The construction by the ministry of health and welfare support of the first special hospital for only children in busan and gyeong-nam is under building with YPNUH(Yangsan Pusan National University Hospital) for the best medical treatment town and is to improve the productivity and efficiency by eliminating unproductive and inefficient fact through the construction management, systemic and scientific management technique. So in this study we would like to suggest the generated effect to apply project management technique to all stage such as from pre-design phase, turn-key enterprise choice, construction, design VE(Value Engineering), PMIS (Project Management Information System) construction to maintenance phase and cost and schedule reduction effect through basic, execution design VE by using engineer of field.

• Advances in aircraft and spacecraft science
• /
• v.5 no.3
• /
• pp.319-334
• /
• 2018

In this study, the failure mode and energy absorption capabilities of a composite shock absorber device, during an emergency landing are evaluated. The prototype has been installed and tested in laboratory simulating an emergency landing test condition. The crash absorber presents an innovative configuration able to reduce the loads transmitted to a helicopter fuselage during an emergency landing. It consists of a composite tailored tube installed on the landing gear strut. During an emergency landing this crash absorber system should be able to absorb energy through a pre-designed deformation. This solution, compared to an oleo-pneumatic shock absorber, avoids sealing checks, very high values of the shock absorber pressure, and results to be lighter, easy in maintenance, inspect and use. The activities reported in this paper have become an attractive research field both from the scientific viewpoint and the prospect of industrial applications, because they offer benefits in terms of energy absorbing, weight savings, increasing the safety levels, and finally reducing the costs in a global sense.

• Journal of Conservation Science
• /
• v.35 no.1
• /
• pp.33-40
• /
• 2019

During the conservation and maintenance of the birthplace center yard of President Asan Yoon Bosun, four porcelain enamel dishware were excavated from the central yard well. The glaze layer of excavated enamel was severely damaged; hence, the conservation process was done rapidly. In addition, scientific investigation and analysis were conducted to confirm the material properties of the glaze layer. It was confirmed that the outer surface was inverted and dried, while the inner surface was upright and fired during the glazing and drying process by measuring the film thickness. By examining the breakup phenomenon, the breaking up of the white enamel on the colored enamel was confirmed. This indicates that the colored glaze rose to the surface depending on the density of the colored glaze and white glaze. The investigation of the cross-section of the film confirmed that the lower layer formed according to the bonding properties with metal during the glazing process. Analysis of the constituents of the identified lower layer confirmed that there are differences between the specific components of the metal oxide of the lower layer and the surface color development of the upper layer.

• International Journal of Computer Science & Network Security
• /
• v.21 no.5
• /
• pp.31-34
• /
• 2021

The article considers the possibilities of increasing the accuracy of estimates of the parameters of the trajectory of the target with the provision of a given probability of stable support of the air object, in particular, during its maneuver. The aim of the work is to develop a filtration algorithm that provides a given probability of stable tracking of the air object by determining the regular components of filtration errors, in particular, when maneuvering the air object, and their compensation with appropriate correction of filter parameters and estimates of air object trajectory parameters.

• Structural Monitoring and Maintenance
• /
• v.9 no.3
• /
• pp.259-270
• /
• 2022

This study explores the use of the recently developed "strain-sensing smart skin" (S⁴) method for noncontact strain measurements on cement-based samples. S⁴ sensors are single-wall carbon nanotubes dilutely embedded in thin polymer films. Strains transmitted to the nanotubes cause systematic shifts in their near-infrared fluorescence spectra, which are analyzed to deduce local strain values. It is found that with cement-based materials, this method is hampered by spectral interference from structured near-infrared cement luminescence. However, application of an opaque blocking layer between the specimen surface and the nanotube sensing film enables interference-free strain measurements. Tests were performed on cement, mortar, and concrete specimens with such modified S⁴ coatings. When specimens were subjected to uniaxial compressive stress, the spectral peak separations varied linearly and predictably with induced strain. These results demonstrate that S⁴ is a promising emerging technology for measuring strains down to ca. 30 𝜇𝜀 in concrete structures.

• International Journal of Computer Science & Network Security
• /
• v.22 no.4
• /
• pp.261-273
• /
• 2022

Over the last decade, the scientific community has been actively developing technologies for automated software bug fixes called Automated Program Repair (APR). Several APR techniques have recently been proposed to effectively address multiple classroom programming errors. However, little attention has been paid to the advances in effective APR techniques for software bugs that are widely occurring during the software life cycle maintenance phase. To further enhance the concept of software testing and debugging, we recommend an optimized automated software repair approach based on hybrid technology (OAPR-HOML'1). The first contribution of the proposed OAPR-HOML'1 technique is to introduce an improved grasshopper optimization (IGO) algorithm for fault location identification in the given test projects. Then, we illustrate an opposition learning based artificial neural network (OL-ANN) technique to select AST node-level transformation schemas to create the sketches which provide automated program repair for those faulty projects. Finally, the OAPR-HOML'1 is evaluated using Defects4J benchmark and the performance is compared with the modern technologies number of bugs fixed, accuracy, precession, recall and F-measure.