Basic Study on Term of Warranty Liability for Water Supply, Drainage, and Sanitation Arrangement Work Defect in Apartment Building
The defect lawsuit of the apartment which is the representative residential style of Korea continues and becomes a social problem. In the defect lawsuit, the term of warranty liability is a period that can demand the defect repair according to defect occurrence, and the exclusion period of the exercise of rights. However, the term of warranty liability stipulated in relevant laws such as Enforcement Decree of the Housing Act is being changed arbitrarily, without any established grounds. Therefore, a reasonable standard for establishing the term of warranty liability is required. In this study, the defects of water supply, drainage and sanitation arrangement work were studied. As a result of analyzing the number of defect occurrence in the apartment, it was shown that the defects in water supply, drainage and sanitation arrangement work occurred more than 80% in the 1st ∼ 2nd year after completion. However, the occurrence of defects from the 3rd year was extremely slight. On the other hand, it was confirmed that the defect occurrence continued until fairly late point of time as the end point of time of the defects was in the 7th to 9th years.
Basic Study on Term of Warranty Liability for Window and Door Work Defect in Apartment Building
In Korea, as lawsuits surrounding the defects of apartments, which are the main housing of the people, are rapidly, it is becoming a social problem. Although the term of warranty liability is the exclusion period of the claim for defect repair, there is no basis for establishing related systems. Since the consequences of defect lawsuits vary greatly according to the term of warranty liability, it has very important meaning for business subject and division owner. Therefore, the definition and period setting for the term of warranty liability should be reasonable. In this study, as a result of reviewing the history of laws and regulations related to the term of warranty liability, any document of grounds could not be found. In addition, it is confirmed the limitations of the institutional aspect that it has never been able to present objective grounds once in several revisions. On the other hand, in order to supplement for this, this study analyzed the trend of defects occurring every year for window and door work defects of apartments. We investigated defects of window and door work in 177 apartment complexes, total of 125,816 households, and as a result of analysis, window and door work showed many defects occurring in the first and second year, and extremely few after the third year. On the other hand, there was a slight difference by the detailed construction type, but there was less variation than the finish work subjected in the previous study.
ROOM- AND HIGH-TEMPERATURE MAGNETIC PROPERTIES OF Sm(CobalFexCu0.088Zr0.025)7.5 (x=0.30) SINTERED MAGNETS
The effect of Fe content on room- and high-temperature magnetic properties of Sm(CobalFexCu0.088Zr0.025)7.5 (x=0-0.30) sintered magnets, prepared by the conventional powder metallurgy method, has been systematically studied. With increasing Fe content, the remanences BT and maximum energy products (BH)max at room temperature gradually increase and reach optimal values of 1.055 T with x=0.27 for BT, and 205 kJ/m3 with x=0.21 for (BH)max, respectively, and then drop sharply with further Fe increase. An excessive addition of Fe (x≥0.24) results in rapid deterioration of permanent magnetic properties due to the formation of a considerable amount of FeCo soft magnetic phase. It was found that the effect of Fe content on high temperature stability is huge. The lower the Fe content, the smaller the temperature coefficient of coercivity. When x=0.07, a temperature coefficient of coercivity of -0.14%/K (293-723 K) can be achieved, as compared with -0.23%/K for x=0.21. BT of 0.725 T, bHc of 517 kA/m, iHc of 764 kA/m, and (BH)max of 95 kJ/m3 at 723 K were obtained, and the B-H demagnetization curve remains a straight line.