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이성길(Seong-Gil Lee),임홍우(Hong-Woo Llm),조금배(Geum-Bae Cho),정수복(Soo-Bok Chung),백형래(Hyung-Lae Baek) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In order to radiate X -ray, the low ripple stabilized high voltage DC over the range of 40KV to 150KV is directly inflicted to X -ray tube. The energy characteristics of the radiated X -ray depend on the pulsating waveforms of the DC voltage supplied X -ray tube In general, the low ripple voltage waveforms with fast rising times are required to increase with the dosage per unit I1me lest the exposure I1me should be longer in orde that the motion artifacts of an object may be eliminated in actual The conventional types of X -ray generators were bulky in physical size and heavy in weight, and the control accuracies of the output voltages were not always satisfactory. The high frequency switching inverter and converter technology on power conversion and control systems have been greatly closed up introducing new power semiconductor devices. To decreasing the volume and the weight of high voltage transformer, and to stabilize ripple, a high frequency PWM inverter is connected between DC source and high voltage transformer. This paper describes the output characteristics according to stabilize ripple of X -ray tube voltage and compared the reproducibility, direcibility and doesage.
이성길,박해암 광주보건대학 1989 論文集 Vol.14 No.-
Recently Uninterruptible Power Supply (UPS) Systems are widely used in a variety of fields a s highily reliable power sources. This paper presents the operation and performance of an UPS using sinusoidal Pulse Width Modulation <PWM> techniques. By using the sinusoidal PWM method for UPS systems, the property of harmonics, efficiency and distortion can be improved. Experimental results showed that sinusoidal PWM techniques have good features for UPS system.
Digital Subtraction Angiography (DSA)시 Grid 사용유무에 따른 화상변화에 관한 연구
이성길,김승국,김영근 광주보건대학 1990 論文集 Vol.15 No.-
It has been investigated the variation of the image for using and no using the Grid at the D.S.A(Digital Subtraction Angiography) system. The result of experiment indicated that in the case of no using the Grid, (1) the irradiation dose of patient was reduced and the life of X-ray tube prolonged. (2) the variation of the contrast was not influence of using the Grid.
放射線 安全管理에 對한 調査硏究 : 全南地域을 中心으로
李成吉 광주보건대학 1985 論文集 Vol.10 No.-
This survey was carried out during the deriod of October 1, '84 to April 30, '85 covering 71 medical facilities in Chonnam Province. It was contested throughout the safety control radiation, radiation source control, radiation exposure, protective facility and image control. The results obtained are as follows; 1. What the medical facilities with x-ray units are handled by persons without licence, are 52.6% in Hospital level, 90.75% in Clinical level and 73% in Public Health center. 2. There are small tube capacity with less than tube current 100mA in 44.5% among the 157 x-ray units surveyed, and 25.4% in nonecollimators. 3. The x-ray room capacity is less than 10m2 is 38.8% in total surveyed medical institution. It is, therefore, not perfect in safety control, so it must be extensioned for prefer control. 4. The radiation shielding systems are perferable for satisfying in 22.5% and unsatisfied in 29.5%, respectively.. 5. There is no radiation exposure counter in medical facilities in 46.6%, even there is radiation exposure counter in 53.4%, though the counter are used in 35.2% only. 6. According to this survey, it is investigated that the regular data control for radiation exposure was not tested in 73.2%. Even though the radiotechnologist takes regular physical examination, the persons was tested by regular in 23.9%. 7. In case of chest indirect photoroentgraphy, the protective partitions are used in 55.9% and the lead apron are used in 15.25% only. 8. In case of daily x-ray checks, there are 87.3% inless than 100 cases, 12.7% in more than 100 case. 9. The medical facilities are checked regularly for the x-ray unit fuction in 16.9% only. 10. As the developing method, the automatic devices are 47.8% and the hand operates are 52.1%. Even though automatic system has, daily function was checked in regular 20.6% only. 11. In case of the intensifying screen, the medium speed intensifying screen is used in 28.1% and the high speed intensifying screen is used in 66.2%, reapectively. But there is only one hospital used the rare earth intensifying screen.
放射線士의 勤務條件에 關한 硏究 : 光州 全南地域 放射線士 報酬를 中心으로
이성길,김영근 광주보건대학 1990 論文集 Vol.15 No.-
This study for the improvement of the working conditions of Radiological Technologicts is based on a qauestionaire reciered from 118 Radiological Technologists who are employed in medical institutions in the Kwangju and Chun-nam areas It was conducted between November 1989 March 1990. The conclusion of this study is as follows. 1. The average daily working time is almost 10 hours. (in 96.1 % of General Hospitals, 100% of Hospitals, 90.4% of Clinics) 2. Concerning holidays 92.3% of General Hospitals have 1 holiday(Rest Way) per week, 50.0% of Hospitals have 1 holidays(Rest Way) per week, 42.8% of Clinics have 1 holidays(Rest Way) per week. However 47.6% of Clinics have 1 holiday(Rest Way) every 2 week. 3. Their average duty intervals was almost within one and two per week. (in 30.8% of General Hospitals, 83.3% of Hospitals, 52.4% of Clinics) 4. Their monthly salary is higher in Hospitals and Clinics then in General Hospitals. 5. Their yearly bonus rate is General Hospitals 600∼70% (67.2%), Hospitals 400∼500%(41.6%), Clinics 100∼200%(47.5%). 6. Danger allowance is paid with the monthly salary in 80.8% of General Hospitals 25.0% of Hospitals. However in 95.2% of Clinics it is not paid entirely. 7. Their inital salary is about 300,000Won. 8. Their satisfaction of monthly salary is almost non satisfactin. 9. Their salary is raised regulary every year (in 46.1% of G. H. 50.0% of Hospitals), but it is irregulary in 71.4% of clinics. 10. Promotion system is managed in 92.3% of the G. H, in 58.3% of Hospitals. 11. Retirement allowance is assured in 98.1% of the G. H. in 66.7% of Hospitals, and in 28.6% of Clinics.