• Proceedings of the Korea Concrete Institute Conference
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• 2000.10a
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• pp.801-809
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• 2000

Until recently as a method of repairing leaking problem, generally urethane series were used for many structures as subway, box culvert etc. However the lacking of sufficient penetration capacity have made it difficult to repair such structures completely. Now, we could achieve enhanced quality of repairing work by using new material which was compounded of urethane series and cement series properly. This material can penetrate concrete structure efficiently and move interactively with the structure in case of the thermal expansion. Besides of this, we could prevent expecting leakage through several improvements on the aspects of design, materials and site implementation.

• Korean Journal of Construction Engineering and Management
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• v.12 no.6
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• pp.142-150
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• 2011

Defect dispute has been increasing to claim by condominium, in increasing to demand and concern in value, quality, and management of apartment building since 2000s. In this study, for checking property of cost in crack issue with precedure of lawsuit on defect, it is analyzing details about repairing cost of concrete crack defect that formed 77 percent of repairing cost. Futhermore, it is studying of composition of repairing cost and difference of repairing cost by repairing method. This is checking details that cost growth has a difference whether court accept a acceptable range of crack width, and repairing method and reinforcement work has to choose between a surface treatment method, a filling method and a injecting method. Meanwhile, it is considerable that disparity of repairing cost whether is a method of painting work.

• Journal of the Korea institute for structural maintenance and inspection
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• v.22 no.1
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• pp.32-39
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• 2018

Repairing timing and the extended service life with repairing are very important for cost estimation during operation. Conventionally used model for repair cost shows a step-shaped cost elevation without consideration of variability of extended service life due to repairing. In the work, RC(Reinforced Concrete) Column is considered for probabilistic evaluation of repairing number and cost. Two mix proportions are prepared and chloride behavior is evaluated with quantitative exterior conditions. The repairing frequency and cost are investigated with varying service life and the extended service life with repairing which were derived from the chloride behavior analysis. The effect of COV(Coefficient of Variation) on repairing frequency is small but the 1st repairing timing is shown to be major parameter. The probabilistic model for repairing cost is capable of reducing the number of repairing with changing the intended service life unlike deterministic model of repairing cost since it can provide continuous repair cost with time.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.48 no.7
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• pp.547-554
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• 2020

Airborne health management system prevents functional failure caused by errors or faults in the airborne software. On-the-fly repairing atomicity violations (AV) in an ARINC-653 concurrent software is critical for guaranteeing correctness of execution of the software. This paper proposes Repairing-AV which efficiently repairs atomicity violations. The Repairing-AV can diagnose and prevent an error on-the-fly by utilizing the training results of the software and controls access to the shared variable of the thread where the error occurred. The evaluation of the Repairing-AV measures the time overhead by applying the previous work and the Repairing-AV to five synthesis programs containing the atomicity violation. As the result of evaluation, the RepairingAV constantly shows about 1.4x time overhead regardless of count of shared variable access.

• Journal of the Korean Society of Costume
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• v.54 no.8
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• pp.27-34
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• 2004

Jang Heung Lim's is a nephew's wife of Kim Duk Ryung, who had been served as a general of Chosun dynasty. When her Tomb was removed to another places there were excavated some articles such as six Korean traditional costume, Korean socks, Korean shoes (Mituri) and so on. The unearthed costume was designated as a monentous folk materials, No.112, and placed on Gwangju folklore museum. At that time, the mending work in the lost part of costume was not implemented. Only an act of textile conservation was worked. In the article, we go through the mending principles and mending methods in damaged parts of costume. First, the mending principles on the damaged costume are as follows : (1) minimize the repaired parts, (2) mend the only damaged parts, (3) use the same color and cloth as that of original ones, (4) use the appropriated stitching method (5) act the fixed framework in case of missing a outer cloth. Second, the mending method related to the damaged part are as follows : (1) the repairing method in the bodice and sleeve part of costume, (2) the repairing method in the hem of steeve, (3) the repairing method in the collar of costume, (4) the repairing method in the armpit part of costume, (5) the repairing method in the connecting parts between one and another width of Korean traditional long skirt. With this article, we wish that the repairing method in the cultural costume will be developed scientifically and specified efficiently.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.3
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• pp.230-238
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• 2017

Carbonation is a representative deterioration for underground structure, which causes additional repair for service life. This study proposes a simplified equation for optimum repair timing without complicated probability calculation, considering initial and repair conditions For the work, initial service life, extended service life through repair, and their COVs(Coefficient of Variation) are considered, and the periods which can reduce number of repair are evaluated. Assuming the two service lives to be independent, the repair timings are derived from 10 to 50 years based on the probabilistic method, and the regression analysis technique for optimum repairing timing is proposed. Decreasing COV has insignificant effect on reducing repairing number but shows a governing effect on changes in probability near the critical repairing stage. The extension of service life through repairing is evaluated to be a critical parameter for reducing repairing number. The proposed technique can be efficiently used for maintenance strategy with actual COV of initial and additional service life due to repairing.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.48 no.10
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• pp.821-829
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• 2020

Health management system of airborne software repairs runtime errors to provide safety and to reduce cost of maintenance. It is critical to on-the-fly repair order violation errors, because it is difficult to identify them at the development phase. Previous work, called Repairing Atomicity Violations (Repairing-AV) diagnoses order violations for each access event by comparing execution order of accesses. As a result, Repairing-AV has time overhead that is proportional to the number of access events to shared variable. This paper presents a tool called On-the-fly Repairing System (ORS) that can repair order violations of object methods containing access events. The ORS diagnoses order violations by using correct order of object methods, and treats them by stalling its thread where the error is about to occur. Experimentation with five synthetic programs shows that ORS is more efficient than Repairing-AV when the number of access events is greater than sixty.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.10a
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• pp.829-834
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• 2002

Recently, research and development for a number of repairing material like an epoxy-based material and polymer-cementitious material as well as anti-washout underwater concrete have been carried out. But, the study on tile materials for the concrete structure exposed to a wetted condition is at a standstill and there are not any suitable reference data at a repairing work for the concrete structure at a splash as well as a structure under severe moisture condition. In this study, the material, called as “ceramic metal”, with an excellent mobility and plasticity as well as with a high bond strength and durability of freezing-thawing resistant properties under any environmental conditions was developed. And, the experimental evaluations for the utility wert widely performed.

• International Journal of Safety
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• v.8 no.1
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• pp.1-5
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• 2009

The CFRP composite has unique properties that offer high strength and stiffness, even though it has light weight. Therefore it can be used in many industrial applications. When mechanical fasteners are used for joining composites, high stress concentrations appear near the edge of holes prepared for accommodating structural bolts and rivets. This presence of high stress concentrations can be a source of damage. The aim of this work is to evaluate fracture behavior and patterns of plain woven CFRP with circular hole and repairing patch element. The maximum strength and pattern for the plain woven carbon composite specimen with the repaired circular hole were examined. From the results, we show that repairing of the CFRP composite specimen with ($\pi$) 3~5 mm of circular hole diameter results in load rising effect and the repairing is more effective as bigger hole specimen.

• Journal of the Korean housing association
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• v.2 no.1
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• pp.93-114
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• 1991

This research was conducted toward the types and kinds of repairing the randomly chosen apartment buildings. The conclusions are : There are eleven types of repairing executions, re - analyzed into thirty \ulcorner one kinds. For the public spaces, in and outside the buildings, there are five types and fifty - one kinds. The management of the buildings are all self - governed with the plannings to continually repair. The claims are most frequently answered by re - equipping the facilities of kitchen work. the bathroom facilities, etc. And for the public facilities there are claims against the bad conditions of electricity, noises tem other fleers, upper and lower, and moistures on the walls. The suggestions for the improvement of the apartment housing conditions may well contribute to the plannings for repairing the facilities, private and public, of the apartment buildings.