• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.48 no.10
• /
• pp.821-829
• /
• 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
• /
• 2005.05b
• /
• pp.277-280
• /
• 2005

Epoxy-mortar composites have been wildly used as finishing and repairing materials in the construction because of their excellent properties. Conventional epoxy-mortars and concretes have an inferior applicability and cost performance ratio due to the two component mixing of the epoxy resin and hardener. In this study, we examined the engineering effect of compressive strength and flexible strength according to the various epoxy-hardener in underwater and humidity environment, and evaluated the hardener types and physical effect of Epoxy mortar using cement binder in underwater and air condition. In this study, it was clarified that the engineering properties of repairing epoxy-motars were effected by the type of hardener.

• Journal of Korean Society for Quality Management
• /
• v.10 no.2
• /
• pp.10-17
• /
• 1982

Three different manual assembly techniques are evaluated by relating the effects of component quality to the total cost of the product. The results show that the choice of the scrapping or repairing the defective products or alternatively, salvaging the acceptable parts, may effect the total product cost by as much as 400 per cent. This paper emphasizes the need for accurate control quality of parts in assembly if low-cost manufacture is to be achieved.

• Journal of Korea Multimedia Society
• /
• v.8 no.7
• /
• pp.953-960
• /
• 2005

The Network can be easily damaged in the mobile computing environment. Mobile Support Station (MSS) which supports the Mobile Host(MH) could also be unstable too. Therefore, when a critical error occurs the repairing cost can be high. For stable repair, the hand-off strategy should be considered to save the continuing message and checkpoint information, and to reduce the cost of network repair. In this paper, we propose the Switching Trickle(ST) strategy which reduces the repairing cost for the MH's mobility. ST strategy changes the way which stores the information in connection with the number of write events(r) that occur from the hands-off strategy. Accumulated cost by increased mobility has been simulated too. From the results of simulation, the proposed strategy has shown more cost effective than the conventional strategy. The proposed strategy also has shown very supportive in saving checkpoint and message log information stably.

• Composites Research
• /
• v.15 no.1
• /
• pp.21-31
• /
• 2002

To overcome the disadvantages of conventional excavation technology various trenchless (or excavation free, or no-dig) repair-reinforcement technologies have been developed and tried. But trenchless technologies so far developed have some drawbacks such as high cost and inconvenience of operation. In this study, a repairing-reinforcing process for underground pipes with glass fiber fabric polymer composites using VARTM (Vacuum Assisted Resin Transfer Molding) has been developed. The developed process requires shorter operation time and lower cost with smaller and simpler operating equipments than those of the conventional trenchless technologies. For the reliable operation of the developed method, a simple method to apply pressure and vacuum to the reinforcement was devised and flexible mold technology was tried. Also, resin filling and cure status during RTM process were monitored with a commercial dielectrometry cure monitoring system, LACOMCURE. From the investigation, it has been found that the developed repairing-reinforcing technology with appropriate process variables and on-line cure monitoring has many advantages over conventional methods.

• Asian-Australasian Journal of Animal Sciences
• /
• v.5 no.4
• /
• pp.709-715
• /
• 1992

In this study attempts were made to identify the areas of single animal ploughing (SAP) in Bangladesh, causes of its localization and the socio-economic constraints hindering the expansion of the system. To determine the areas of single animal ploughing, 123 upazilas of 15 districts were surveyed. Of them, 16 upazilas were found heavily engaged with this system. A detailed investigation of 469 SAP and 439 double animal ploughing (DAP) farmers revealed that there was significant difference between the two systems in respect of cost of production and yield per unit of land. The benefit/cost (B/C) ratio was higher in SAP system. However, no significant difference was observed in respect of time required for ploughing, intensity of cropping, cost of implements, and cost of repairing implements (except yoke). The study recommends for expansion of SAP system in areas where buffaloes are concentrated. Fro this purpose, logistic and institutional supports need to be made available.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2004.05a
• /
• pp.105-108
• /
• 2004

The most of former schools facility have been planed and constructed with cement liquid waterproofing which is moth to be desired fir behavior of structure. However. It cause to decline safety for structure and also increase repairing cost that by leakage to behavior for thermal effects, Moreover, It is necessary for establishment fundamental counterplan of maintenance for schools facility to improve educational environment in budget support and proper diagnostic tech. and evaluation, repair reinforcement. In present paper, Firstly, we analyze out leakage and defect of schools facility of ㅇㅇ district office of education. Secondly, suggest the proper diagnostic tech. as leakage factor to develope efficiency of using space for durability and safety from leakage with suggestion the proper diagnostic.

• Journal of the Korean Society of Industry Convergence
• /
• v.16 no.1
• /
• pp.14-20
• /
• 2013

In this study, characteristic of new materials for repairing/reinforcement of sea and underwater structures using urethane were studied experimentally. As a results, following their good result was obtained. Materials and construction methods due to a chemical reaction, so no seams, shape or form, regardless of the variety of civil engineering in the field can be applied. Fast workability, hardening existing concrete compared with 80% in shortening. Than the existing large concrete pouring construction cost could be reduced by more than 30%.

• Proceedings of the Safety Management and Science Conference
• /
• 2004.11a
• /
• pp.125-130
• /
• 2004

It is not difficult to see the road repairing. There are many and various machines that can crush road surface. The efficiency and power of the machine depend on crushing head-shape, crushing interval, crushing load, crushing stress, machine's dropping height and roller's kind. The objective of this study is to select the optimal model among ten models of crushing machine with constraints such as crushing depth, variation, and crushed particle size. The data for this study are chosen from the site of construction in Kangnung during three months ($2004.\;6.\;1\;\sim\;2004.\;8.\;31$). The provided methodology in this paper will be fruitful not only for the selection of crushing machine but also for the aspects of construction period, cost, work efficacy according to the condition from the various sites of construction.

• Advances in concrete construction
• /
• v.8 no.2
• /
• pp.91-100
• /
• 2019

In this paper three damaged exterior RC beam-column joints made of recycled aggregate concrete (RAC) were repaired. The aim of the study was to restore back the lost capacity of the beam-column joint to the original state or more. A relatively cheap material locally available galvanized steel welded wire mesh (GSWWM) of grid size 25 mm was used to confine the damaged region and then jacketed with cement mortar. Repaired specimens were also subjected to similar cyclic displacement as those of unrepaired specimens. Seismic parameters such as load carrying capacity, ductility, energy dissipation, stiffness degradation etc. were analyzed. Results show that repaired specimens exhibited better seismic performance and hence the adopted repairing strategies could be considered as satisfactory. These findings would be helpful to the field engineers to adopt a suitable rapid and cost efficient repairing technique for restoring the damaged frame structural joints for post earthquake usage.