방사선사(放射線士)의 동무(勤務) 실태(實態)에 관한 조사연구(調査硏究)

최종학,전만진,박영선,Choi, Jong-Hak,Jeon, Man-Jin,Park, Young-Sun 대한방사선과학회 1986 방사선기술과학 Vol.9 No.1

We got the following results from the 324 radiologic technologists as we surveyed their working condition by using the questionaire, who were working in the medical institutions (general hospitals and doctor's clinics) situated in the area of Seoul city, Kyung ki-do and Chung-chong-do since June to December 1985. 1. Their daily average working time was almost within 10 hours (in 93.9% of general hospitals, 66.1% of clinics). 2. About the numbers of holidays, 85.5% of general hospitals have one holiday per week,41.3% of clinics have one holiday per week or 38.5% of clinics have one holiday per two weeks. 3. Duty appointment of radiologic technologists in the department of radiology is taking charge of each part after serving for a certain part for some period (42.8%), taking charge of the special part continually or by turns in other working parts (35.3%). On the other hand in the clinics they took charge of all parts continually (53.2%) or by turns with their own situations. (30.3%). 4. Their daily working amount is too much in 51.6% of general hospitals or 45.8% of clinics. 5. They answered it was hard in 81.4% of general hospitals or 43.1% of clinics about the degree of difficulty of their work. 6. Their monthly salary is higher in the clinics than in the general hospitals and higher in Seoul area than in Kyung-ki or Chung-chong area. 7. Their yearly bonus .ate is 400%-600% (69.2%) in almost general hospitals, 100%-300% (57.8%) in th. clinics. 8. Danger allowance is paid with the monthly salary in 62.8% of the general hospitals or 19.2% of clinics and license allowance is paid in 44.7% of general hospitals or in 12.8% of clinics. 9. Their initial salary (except bonus) is about 200,000 won (in 76.8% of general hospitals, in 67.8% of clinics). 10. Their salary is raised regulary every year in 52.6% of general hospitals, but it is irregulary in 73.4% of clinics. 11. Promotion system is managed in 48.4% of the general hospitals or in 14.7% of clinics. 12. Retirement allowance is assured in 96.9% of the general hospitals or in 63.3% of clinics. 13. Main cause of their retirement is moving to more paid hospitals, better hospitals in working condition or facilities, moving to another cities, to the hospitals with more opportunities of promotion or choosing other jobs etc. 14. Human relationship with doctors, nurses or co-worker technologists as a member of medical team appeared almost intimate and good.

전문대학(專門大學) 방사선과(放射線科)의 수업년한(修業年限) 연장(延長)에 관한 연구(硏究)

최종학,이상석,김영일,전만진,권달관,박영선,임한영,강세식,Choi, Jong-Hak,Lee, Sang-Suk,Kim, Young-Il,Jeon, Man-Jin,Kwon, Dal-Gwan,Park, Young-Sun,Lim, Han-Young,Kang, Se-Sik 대한방사선과학회 1990 방사선기술과학 Vol.13 No.2

As the institute of education teaching radiologic technology in Korea, different from others, junior college is the only institute which has been managed for it as a two-year educational course for 27 years since 1963 when it was established for the first time in our country irrespective of the needs of the times. But according to the development of medical equipment, variety of medical skill, increase of medical demands now a days, the supply of radiologic technology in modern medicine not only makes it advance as an inevitable factor but also broadens the area of its business systematically. Therefore, we got the following results after we had considered the necessity to lengthen the term of education and searched for the most reasonable way. 1. The term of study of the radiologic technologists in junior college must be lengthened to 3 years from 2 or 3 years regulated in the law of education. 2. In three-year curriculum, the subjects like basic medical science, science and engineering and ultramodern science, etc., which are lated to the new radiologic science must be taught in the junior colleges, and hospital practice also must be a compulsory subject in curriculum. 3. As the school years becomes longer, a lot of programs to make the study effective must be searched, researched and propelled forward.

유유아(乳幼兒)의 흉부X선검사(胸部X線檢査)에 대(對)한 통계학적(統計學的) 고찰(考察)

최종학,전만진,김영일,Choi, Jong-Hak,Jeon, Man-Jin,Kim, Yong-Ill 대한방사선과학회 1979 방사선기술과학 Vol.2 No.1

For this study, 2,712 sheets of the chest x-ray films of neonatuses, infants and early children were observed statistically and then the following results were obtained: 1. Seasonal increment of patients was overwhelming in spring and summer in compare with in autumn and winter. 2. Males was majority in distribution by sex. Neonatal and infancy group was the largest in number by forming 29.46% in distribution by age group and then follows six-years group(14.75%), one-year group(13.64%) and five-years group(12.61%) 3. In radiographical projection for chest, a great proportion was P-A projection as 53.72%. But, almost all the neonatal and infancy group and emergency patients were by A-P projection 4. As for x-ray findings, 78.47% was normality while 21.53% was abnormality. Tuberculosis(176 cases), was the largest in number in abnormal cases and next in rank was pneumonia(128 cases)and then congenital heart disease(82 cases). 5. Adequacy of exposure was disclosed as follows: 57.01% in correct-exposure 29.20% in over-exposure, 13.79% in under-exposure. 6. The x-ray beam was not restricted in 77.10% of total films. 7. "Good" formed 30.01% in position immobilizing of the patient and "ordinary" formed 38.02%, "bad" 31.97%. Especially, "Bad" formed high percentage in neonatal and infancy group.

Effect of biocompatible polymers on the physicochemical and dissolution properties of fenofibrate in nanoparticle system

최종학,이기범,Sungho Hong,Seok Kyu Lee,오유경,Seung Kyu Choi,최한곤 한국약제학회 2013 Journal of Pharmaceutical Investigation Vol.43 No.6

This study aimed to evaluate the effect of biocompatible polymers on the physicochemical and dissolution properties of poorly water-soluble drugs in nanoparticle systems. Four types of nanoparticles containing poorly watersoluble fenofibrate were prepared using solvent evaporation technique with different biocompatible polymers such as polyvinylpyrrolidone (PVP), hydroxypropylmethyl cellulose (HPMC), carbopol and ethylcellulose. Their physicochemical properties were investigated using scanning electron microscopy, differential scanning calorimetry, and powder X-ray diffraction. The solubility and dissolution of nanoparticle-entrapped fenofibrate were compared with those of free drug powder. Biocompatible polymers affected the morphology and sizes of fenofibrate nanoparticles. PVP or carbopol-based nanoparticles showed spherical appearance,whereas HPMC or ethylcellulose-based nanoparticles formed aggregates with irregular shape. The particle sizes increased in the order of the nanoparticle prepared with carbopol B PVP\HPMC\ethylcellulose. The size of PVP-based nanoparticles did not significantly differ fromthat of carbopol-based nanoparticles, showing the mean sizes of ca. 10 lm. As compared to free drug powder, the solubility and dissolution of the drug in nanoparticles increased in the order of PVP[HPMC[carbopol[ethylcellulose. The enhanced solubility and dissolution of poorly water-soluble fenofibrate via nanoparticle system did not depend on particle size but on crystallinity. In conclusion, in nanoparticle development of poorly water-soluble drugs such as fenofibrate,the nature of biocompatible polymers plays an important role in the physicochemical and dissolution of poorly water-soluble drugs in the nanoparticles.

흰불나방의 중장(中腸)에 미치는 $\gamma$선(線) 조사(照射)의 영향(影響)

최종학,Choi, Jong-Hak 대한방사선과학회 1980 방사선기술과학 Vol.3 No.1

흰불나방(Hyphantria cunea Drury)의 각(各) 변태단계(變態段階)에 따라 $1.75{\sim}7krad$의 Cobalt-60 $\gamma$선(線)을 전신조사(全身照射)하여 $\gamma$선조사(線照射)에 의(依)한 중장세포(中腸細胞)의 조직학적(組織學的) 변화(變化)를 광학현미경(光學顯微鏡)으로 정상군(正常群)과 비교(比較) 관찰(觀察)하였던 바, 다음과 같은 결과(結果)를 얻었다. 1. 중장(中腸)의 상피세포(上皮細胞)는 원주세포(圓柱細胞), 배상세포(杯狀細胞), 신생세포(新生細胞)로 구성(構成)되어 있었다. 2. 조사(照射)의 영향(影響)은 조사(照射)된 선량(線量)과 변태시기(變態時期)에 따라 변화(變化)되었다. 3. 조직학적(組織學的) 변화(變化)의 정도(程度)는 조사선량(照射線量)이 많을수록 증대(增大)되었다. 4. 방사선(放射線)의 감수성(感受性)은 종령유충(終齡幼蟲), 용8일(日)에서 가장 높았다. In this paper, the author studied the histological changes of the midgut cells of fall webworms(Hyphantria cunea Drury) through 1.75-7 krad of the whole body gamma irradiation according to their metamorphosis by comparing the contol group with the irradiated one through an optical microscope. Here the results were as follows: 1. The epithelium of midgut was composed of columnar, goblet and regenerative cells. 2. The effects of gamma irradiation were varied with the dosages and the stages during the metamorphosis. 3. The degree of histological change mode by irradiation was increased with the dosages. 4. Radiosensitivity was the highest in both last-stage larva and 8-day-old pupae.

흉부(胸部) 정면(正面)X선사진(線寫眞)의 화질(畵質)에 관한 검사(檢討)

최종학,전만진,이창엽,Choi, Jong-Hak,Jeon, Man-Jin,Lee, Chang-Yup 대한방사선과학회 1985 방사선기술과학 Vol.8 No.2

The author came to analize and get the following problems after researched radiographic quality in order to find out the necessary factors to improve in radiographs of frontal projection of the chest selected at random of the adult patients (1545 male, 1520 female) who had been examined in 4 departments of radiology of the general hospitals in Seoul and Kyungki area. 1. Problems of x-ray film or of radiographic cassette appeared in 2.97% radiographs on account of selection of the film size (except costophrenic sinus) (1.79%), poor screen-film contact (0.85%), light leakage of cassette (0,33%). 2. Problems of patients' positioning or breathing appeared in 16.57% radiographs of all because of overlapping of lung apex and clavicle (6.98%), overlapping of scapula and lung field (5.87%), asymmetrical projection of clavicles (1.76%), errors in positioning and breathing of the patient (1.96%). 3. Problems of x-ray exposure factors or film processing appeared in 22.25% radiographs because of over-density (2.64%), under-density (3.95%), fog (0.59%), demonstration density under clavicles or lung marking unsharply (3.82%), not clear of lung marking from breast region (0.94%), not clear the lung marking from the part overlapped of heart and lungs (3.92%), not clear the lung marking from the part overlapped of liver and lung (6.49%).

CCTV 이미지와 CNN 딥러닝을 이용한 농업용수로 수위 계측

김귀훈 ( Kwihoon Kim ),명우호 ( Wooho Myoung ),김마가 ( Maga Kim ),윤푸른 ( Pureun Yoon ),방재홍 ( Jehong Bang ),최진용 ( Jin-yong Choi ) 한국농공학회 2021 한국농공학회 학술대회초록집 Vol.2021 No.-

헬륨 상태를 고려한 하드디스크드라이브의 TFC 분석

최종학(Jonghak Choi),박노철(No-Cheol Park),박영필(Young-Pil Park),박경수(Kyoung-Su Park),이용현(Yonghyun Lee),홍어진(Eo-Kin Hong),김철순(Cheol-Soon Kim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10

사례논문 : 서초발전설비(주)의 자산재평가 의사결정이 재무제표에 미친 영향

최종학 ( Jong Hag Choi ),권혜진 ( Helen Hyejin Kwon ) 한국회계학회 2012 회계저널 Vol.21 No.1

서초발전설비㈜는 특수장비를 이용하여 발전소 사용 장비를 건설하는 회사로서, 아시아 및 세계가 발전함에 따라 발전소 건설 수요가 증가하면서 큰 성공을 거두었다. 그러나 2008년 세계 금융위기에서 출발한 전세계적인 불황이 불어닥치자 서초발전설비㈜는 다른 회사들과 마찬가지로 큰 어려움에 처했다. 특히 환율이 상승하여 재무제표에 기록되는 외화부채 금액이 증가함에 따라 부채비율이 급증하여 자금조달에 어려움을 겪게 된다. 상황이 더 악화되는 것을 막기 위해 서초발전설비㈜은 자산재평가를 실시할 것을 고려한다. 자산재평가는 유형자산을 취득원가가 아닌 시가에 따라 재평가된 금액으로 표시하는 것이다. 자산재평가를 실시하면 재평가차액만큼 대차대조표 상 자산이 늘어나고, 재평가적립금을 기타포괄손익누계액으로 처리할 수 있으므로 자본이 증가한다. 그 결과 재무제표를 이용해서 계산되는 부채비율이 감소한다 Seocho Heavy Industry (SHI) is a manufacturing company that uses a special equipment to produce machines used in power plant. Due to recent economic development in Asian and other countries, the deman for electricity had been increased and thus the demand for the SHI`s machine also increased. To meet the increasing demand, SHI made huge investment with cash raised from foreign currency-denominated debt. However, during the World Economic Crisis of 2008, the demand dropped sharply and SHI faced severe financial troubles. To solve the crisis, SHI considers assets revaluation. If SHI revaluate assets, both assets and shareholders` equity increase and thus debt-to-equity ratio decreases, revealing favorable effects for the financial status measured by financial ratios.

임상원저 : 3급 부정교합을 가진 구순구개열 환자에 대한 두개계측학적 연구

최종학 ( Jong Hak Choi ),황웅 ( Ung Hwang ),유선열 ( Sun Youl Ryu ) 대한악안면성형재건외과학회 2004 Maxillofacial Plastic Reconstructive Surgery Vol.26 No.6