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이재환(Jae-Hwan Lee),박병재(Byung-Jae Park) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.2
The proper surf= pressure on the pistons rings in the diesel engine of a ship is very important, because the pressure controls the oil that is needed to maintain friction at acceptable levels between the pistons and the cylinders. In this paper, basic and theoretical concepts to compute the ring pressure were formulated and applied to obtain the proper surface pressures on selected sample piston rings. During the calculation of the pressure on the piston rings, the computation of the accurate free shape of the piston ring was required. Earlier, Arnold and Prescott introduced theories to compute the free shapes of piston lings, and their approach used rectangular and polar coordinates. In this paper, the free shapes of piston rings using two different theories were computed and compared. The results were quite close, representing the free shape of the piston ring. Ring pressure was computed using the Arnold's free shape that was obtained. A simple GUI was made to compute the surface pressure on the piston rings.
장준혁 ( Jun Hyuk Jang ),김홍태 ( Hong Tae Kim ),박병재 ( Byung Jae Park ) 대한설비관리학회 2013 대한설비관리학회지 Vol.18 No.4
Fatigue of maritime workers has been regarded as a potential cause of marine accident or a factor that contributed to human errors. However a recent related study figured out that fatigue of maritime worker sclosely affected practicing a job and is one of main causes to bring human errors. So, whether to consider human factors on maritime field or not is becoming an object of interest. In this paper, for easily measuring fatigue of maritime workers in onboard, maritime crew fatigue assessment system (McFAS) based on smartphone application was developed. McFAS was composed of flicker tester, fatigue tester and job stress tester and was verified through comparison of results with other fatigue measuring equipment.
朴柄宰 中央醫學社 1970 中央醫學 Vol.19 No.6
For study of the environmental factors of the ascaris infection, the author examined the ascaris eggs in the dooryard soil, vegetable yards, sewage, and privies as well as the vegetables at markets in Seoul and its vicinity The results are summarized as follows; 1. No ascaris egg was detected from the dooryard soil of regular areas(relatively well sanitated areas), but the ascaris eggs were detected in 10 to 30% of specimens of slum areas(poorly sanitated area) and in 15/0 of them of the city stool storage tank area. 2. The numbers of ascaris eggs in every 100gm of dooryard soil were 26 in regular area but 227 at slum area. 3. The percentile of live ascaris egg was 80 in regular area but 100 in slum area. And the larva containing egg of ascaris was 8. 8% of detected ascaris eggs at slum area. 4. The average value of the E.P.G. (eggs per gram of feces) of the home stool tanks was 2,700 at regular areas and 5,067 at slum area. 5. The ascaris eggs were detected in 20% of the cultivation fields fertilized with chemical fertilizer and night soil, but in 80% of them fertilized with night soil only. 95.5% of ascaris eggs developed to larval stage. 6. The number of ascaris eggs per 1,000m] of sewage at Mapoku district of Seoul was 10. 7. Ascaris eggs were detected in 15 out of 128 market cabbages in Seoul and in 75 of 160 fields cabbages cultivated in Seoul and its vicinity. The detection rates of ascaris egg from each one of vegetable were: 19.0% in market cabbage, 9.3% in field cabbage, 18.3% in field raddish. 8. On examination the vegetables, lettuces which were grown in green houses during winter season at Mangwondong of Seoul, two larva containing eggs were detected. 9. The detection rates of ascaris eggs from each one of summer vegetable were 5.0% in welsh onion, 5.0% in onion, 36.7/o in fresh garlic, 0.6/o in garden spinach. 10. 150 pickles samples were negative for ascaris egg. The results suggest that the environmental factor is considered as main, factor for ascaris infection, in Korea, rather than by vegetable matters.
ASTIBAN(Antimony Sodium Meso-2·3-Dimercaptosuccinate)에 依한 肝디스토마症 治驗成績
朴炳宰,金永麟,蘇鎭卓,李東奎 中央醫學社 1964 中央醫學 Vol.6 No.1
Experimental and clinical trials of Astiban(Antimony sodium meso-2, 3-dimerc2iptosuccinate) upon the infection of Clonorchis sinensis are summarized as follows; 1. Egg reduction was observed in two rabbits after the administration of the drug (100 mg for three or five days).The adult worm showed moderate atrophic changes on vitelline glands. 2. Six of thirty one cases converted to complete egg negative, resulting 19. 4% of cure rate. 3. During the treatment, side effects were observed more or less in all cases and they were myoarthralgia, loss of appetite, nausea and vomiting, abdominal discomfort, diarrhea, abdominal pain, general weakness, and diziness, and ascites was experienced in one case. 4. Follow up studies to nine cases were carried on for three or six months, and found to show no reverse from the initial data.