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조용무,김재도 ( Y . M . Cho,J . D . Kim ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.4
The laser beam hardening has been experimentally tried to find the hardened characteristics of STD11. Experiment was performed on the optimum hardening condition with 2kW CO₂laser. The microstructure of the hardened layers was observed using the microscope. The hardened zones exhibits very high Vickers microhardness of 720Hv, however, the deoxidation was observed under the surface of hardened area. The case depth of hardened zones is about 0.6㎜ and case width is 4㎜. FEM-simulation on laser surface hardening of STD11 steel are described. With the proper assumption of the absorbed energy density, the calculated case depth and width in 2kW CO₂laser hardening were in good agreement with the experimental result. It was found that there is optimum absorbed energy density of STD11.
趙鏞武 서울大學校 保健大學院 1970 公衆保健雜誌 Vol.7 No.1
From August 1 to September 31, 1969, surveys were conducted on the legal minimum work volume and the appointment status of the 224 medical inspectors assigned to inspect the 11,050 medical institutious in this country. Through the analysis of data thus collected, the following result were achieved: 1. The average number of hours actually available for personal inspection by each medical inspector in cities was calculated as three hours and 10 minutes daily out of his eight work hours, and that by each medical inspector in Kun(country) as two hours. 2. Out of the total number of days available for inspection each year, 227 days (62.2 per cent of the total number of days in a year), 150 days(66 per cent) were actually available for inspection by medical supervisors in cities and only 80 days(35.7 per cent) for inspection by medical inspectors in Kun. Therefore, each medical inspector could supervise 343 medical institutions in cities and 68 in Kun. 3. As the result of comparison between the total legal minimum manpower requirement for medical inspectors and the number of assigned medical supervisors, the excess of shortage of assigned inspectors was discovered as follows: (Unit: persons) Area Excess or shortage City Country Seoul -29 Pusan -5 Kyonggi -4.5 -37.11 Kangwon -1.3 -14.2 N. Ch'ungch'ong 0.4 -11.4 S. Ch'ungch'ong -1.3 -27 N. Cholla -1.3 -11.3 S. Cholla -3.7 -15.3 N. Kyongsang -7.4 -23.2 S. Kyongsang -2.2 -18.1 Cheju 0.5 -1.3 4. Out of a total of 4,595 cases of illegal medical practices uncovered by medical inspectors, 1,643 cases or 35.7 per cent, the greatest proportion, accounted for unlicensed medical practitioners. 5. As for the qualification of incumbent medical inspectors, only 33 of them or 14.7 per cent were appointed on the temporary but full-time basis while 181 or 82.9 per cent were on the regular but part time basis conducting medical supervision as frequently as required while performing other medical administration.