방사선사의 임금 적정성 및 직무 만족도

박재윤,강기봉,김규형,안중성,홍성완,이재석,권익수,최재호,Park, Jae-Yoon,Kang, Gi-Bong,Kim, Gyoo-Hyung,Ahn, Jung-Seong,Hong, Seong-Wan,Lee, Jae-Seok,Kwon, Ick-Su,Choi, Jae-Ho 대한방사선과학회 2018 방사선기술과학 Vol.41 No.6

This study aims to provide the basic data helpful for the improvement of rights and interests of radiological technologists, by understanding the current working environment and if they get the proper reward through the analysis on the perception of appropriateness of current wage and job satisfaction of radiological technologists. Survey was conducted to evaluate the perception of satisfaction with job and wage system, work intensity, necessity of the radiological technologist limit system, and turnover in accordance. The appropriate starting salary was low in case of women and non-capital area, and when the age, academic background, career, and hospital size were lower. The appropriate wage was low in case of women and non-capital area, and when the academic background and hospital size were lower. The negative perception of the necessity to change the wage system was shown in university hospitals. Regarding the work intensity, in case of women and low career, and when the age, academic background, and hospital size were higher, the work intensity was perceived as high. When the academic degree and hospital size were lower, the positive perception of the radiological technologist limit was shown. The turnover intention was high in case of women, and when the age, academic background, career, and hospital size were lower. In order to increase the job satisfaction of radiological technologists, it would be necessary to the appropriate reward and the environment where they could concentrate on work.

^99mTc에서 방출되는 감마선이 CT 영상에 미치는 영향

박재윤,이용기,Park, Jae-Yoon,Lee, Yong-Ki 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.2

This study examines the changes that $^{99m}Tc$ causes to CT(Computed Tomography) images quantitatively when CT scans were continuously performed using $^{99m}Tc$. With the use of the CT, $^{99m}Tc$ 740MBq was injected into the Resolution Phantom and Water Phantom, and the tube voltage was changed with 80 kVp and 120 kVp, scanning before and after the injection. The result indicate, by comparing the Signal Intensity according to the presence or absence of the $^{99m}Tc$ injection with the tube voltage of 120 kVp and 80 kVp, a decrease of 0.173 and 0.241 was observed respectively and the spatial resolution increase of 0.090 and 0.109 was observed respectively. The order of the test should be considered because the gamma rays of the radiopharmaceutical used in the nuclear medicine test do not affect the CT while the effective half-life of the radiopharmaceuticals should be considered for the CT scan to reduce the influence of the gamma rays emitted after the nuclear medicine test, with the possibility to reduce the difference of the results. $^{99m}Tc$을 이용하는 검사를 받고 CT 검사를 진행했을 때 CT 영상에 $^{99m}Tc$이 미치는 변화에 대하여 정량적으로 알아보고자 하였다. Resolution phantom과 Water phantom에 $^{99m}Tc$ 740 MBq를 주입 전 후 80 kVp와 120 kVp로 관전압을 변화시켜 CT Scan하였다. 연구결과 $^{99m}Tc$ 주입 전 후 신호강도는 각각 0.173, 0.241의 감소하였으며, 공간분해능은 각각 0.090, 0.109로 증가하였다. CT 촬영을 $^{99m}Tc$의 유효 반감기를 고려하여 $^{99m}Tc$의 감마선이 CT에 영향을 미치지 않도록 일정한 시간 후 진행함으로 영상의 변화를 줄일 수 있을 것으로 사료된다.

기계적 합금화한 Fe계 분말 특성에 관한 뫼스바우어 분광학적 연구

박재윤,최재주,Park, Jae-Yoon,Choi, Jae-Joo 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.1

비 평형 시료제조법으로 잘 알려진 기계적 합금법을 이용하여 Fe(Fe-Cr, Fe-Mn, Fe-Cu, Fe-Zn)계 분말을 제조하였다. 일정한 당량비를 갖는 Fe와 전이금속원소 M(Cr, Mn, Cu, Zn)분말을 Ar 분위기에서 볼밀을 사용하여 수주에 걸친 기계적 합금을 시행하였다. 분쇄시간에 대한 Fe계 분말들의 결정 구조적 및 초미세 자기적 특성 변화를 X선 회절기와 $M\"{o}ssbauer$ 분광계를 이용하여 관찰하였다. X-선 회절실험 결과 밀링시간의 진행에 따라 합금이 발생되고 격자 상수값은 전이금속원자 M의 Fe원자 치환에 따라 증가하였다. Fe원자 주위의 국소적 원자분포의 영향을 조사하기 위한 $M\"{o}ssbauer$ 분광실험에서 밀링시간의 경과와 더불어 강자성 상에 대한 공명 흡수선들의 평균선폭은 증가되었고 상자성 상 역시 관측 되었다. 치환에 의한 Fe 원자간 거리증가는 초미세 자기장값은 분산된 값을 가져왔으며, quadrupole shift와 isomer shift의 결과는 M 치환으로 Fe의 결정구조와 국부적 전하분포의 변화가 크게 일어나지 않음을 보여준다. Fe-based powders, Fe-M(M=Cr, Mn, Cu, Zn), were prepared in Ar gas by mechanical alloying and their crystallographic and magnetic properties were investigated. X-ray diffraction indicates that the cubic lattice parameter increases for the M substitution. The distance of closest approach around M can explained the increase of lattice constant in Fe-M powders. $M\"{o}ssbauer$ spectroscopy measurements on Fe-M samples indicates the coexistence of ferromagnetic phases and paramagnetic phase that are created by the distribution of local environment M on Fe atom. On the other hand, The spread of line-width on $M\"{o}ssbauer$ spectra can be explained by the distribution of hyperfine magnetic fields. The results of quadrupole shift and isomer shift revealed that M substitutions in Fe-M powders didn't change both structure and the local charge distribution around Fe atom severely.

고주파 플라즈마 시스템에 의안 디젤기관의 배기가스 특성

박재윤,정장근,김종석,하현진,Park, Jae-Yoon,Jung, Jang-Gun,Kim, Jong-Suk,Ha, Hyun-Jin 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.5

NOx, Soot and other exhausted components already became a dangerous state as principal materials of the air pollution. Therefore, the exhausted regulations are getting strict in the many countries. In this paper, reduction characteristic of NOx Soot and CO from diesel engine are investigated when MF plasma system is put to the diesel engine. NOx is decreased in all measured load and applied voltage to plasma reactor. 자동차에서 발생되어지는 NOx, Soot 그리고 기타 배출 가스는 대기오염의 주요한 원인물질이다. 그래서 많은 나라에서 이를 점점 더 엄격하게 규제하고 있는 실정이다. 본 논문에서는 디젤 엔진에서 발생되어진 NO, Soot 그리고 CO를 고주파 플라즈마 시스템을 이용하여 제거특성을 연구 하였다. 전반적으로 유해 물질들이 전압이 증가함에 따라 그 제거특성이 우수하게 나타났다.

코로나 방전-EGR 조합시스템에 의한 디젤기관의 배기 가스 특성

박재윤,정장근,김종석,하현진,Park, Jae-Yoon,Jung, Jang-Gun,Kim, Jong-Suk,Ha, Hyun-Jin 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.7

고연료 중 대부분이 수소와 탄소의 결합물이다. 연료들은 엔진 내부에서 완전 연소되었을 경우는 수분인 증기와 $CO_2$가 발생된다. 그러나 대개 불완전 연소가 일어나 $NO_x$나 Smoke가 발생되어진다. 그리고 이 물질은 인해에 매우 해로운 물질들이다. 본 논문에서는 EGR과 상용주파수를 이용한 플라즈마 장치를 조합하여 배기가스 유해물질 제거 특성을 연구하였다. $NO_x$의 경우에는 전압과 EGR율이 증가할수록 유해물질 제거 특성이 우수하였고, Smoke의 경우에는 EGR 율이 증가하게 되면 Smoke의 발생율이 증가하였으나 전압이 증가하게 되면 발생율이 감소하였다. A great part of flint fuel is Hydrogen and carbon's combination, they should be generated steam and carbon gas when combine with oxygen for perfect combustion in the inside of engine but, the pollutive material are discharged, even though perfect combustion condition especially $NO_x$ and Smoke. they are really harmful for health. In this paper was shown the result of discharging gas' reduction quality. which used combination of corona discharge using the high voltage source of common frequency with EGR. $NO_x$ is increased in entire load erea in proportion to increasing of EGR rate and impression voltage. Smoke is increased slowly under 75[%] in load rate but it is increased rapidly in entire load erea and the reduction rate of Smoke is increased in proportion to increasing of impression voltage.

다중침전극형 플라즈마 반응기를 이용한 수소발생 특성

박재윤,김종석,정장근,고희석,박상현,이현우,Park, Jae-Yoon,Kim, Jong-Seok,Jung, Jang-Gun,Goh, Hee-Seok,Park, Sang-Hyun,Lee, Hyun-Woo 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.11

This paper is investigated about the effect of carrier gas type and the humidity for generating hydrogen gas. The vibration of the water surface is more powerful with increasing applied voltage. In this experimental reactor which is made of multi-needle and plate, the maximum acquired hydrogen production rate is about 3500 ppm. In the experimental result of generating hydrogen gas by non-thermal plasma reactor, the rate of generating hydrogen gas is different with what kind of carrier gas is. We used two types of carrier gas, such as $N_2$ and He. $N_2$ as carrier gas is more efficient to generate hydrogen gas than He because $N_2$ is reacted with $O_2$, which is made from water dissociation. In comparison with water droplet by humidifier and without water droplet by humidifier, the generation of hydrogen gas is decreased in case of water droplet by humidifier. That is the result that the energy for water dissociation is reduced on water surface because a part of plasma energy is absorbed at the small water molecular produced from humidifier.

정보기술의 발전과 주식시장 정보전달 속도

박재윤 ( Jae Yoon Park ),이충열 ( Choong Lyol Lee ),강임호 ( Im Ho Kang ),이선호 ( Sun Ho Lee ) 한국금융연구원 2013 KIF 연구보고서 Vol.2013 No.3

This report attempts to examine the effect of ICT development on the speed of information transfer in stock market. For this purpose, we investigate the theoretical background and estimate the statistical model. At first, we represent the speed of information transfer in stock market by Delay Measure which was used to measure the speed of price adjustment in stock markets among countries for global market information and we choose the indicators of ICT development as the number of internet users, mobile phone users, broadband internet users and telephone users. Indeed, we applied stock market data of 7 East Asian countries and 3 Europe countries between 2000 and 2010. At second, we examine the recent trend of these variables and estimate the model representing the relationship between the delay measure and ICT indicators by applying panel estimation methods. From this analysis, we find several important facts. First, several ICT indicators such as the number of broadband internet users and mobile phone users have increased very fast during 2000s. However, the difference between developed countries and developing countries are very big. Second, delay measures of 7 East Asian countries and 3 Europe countries have decreased almost countries between 2000 and 2010. That is, the speed of information transfer in stock markets among countries for global market information has fasted during 10 years. Third, we find that ICT development increased the speed of information transfer in stock markets among countries. Forth, turnover rate of stock market in each country was shown to increase the speed of information transfer and similarity in economic size and environment with global market also increased the speed of information transfer in stock markets.

유럽법과 공법의 관점에서 본 징벌적 손해배상제 -행정법에 있어서 사인의 소송 및 집행의 역할 (2부) -

박재윤(Jae-Yoon Park) 서울대학교 공익산업법센터 2021 경제규제와 법 Vol.14 No.1

행정조직형태에 관한 법정책적 접근

박재윤(Jae Yoon Park) 행정법이론실무학회 2010 행정법연구 Vol.- No.26

99m Tc에서 방출되는 감마선이 CT 영상에 미치는 영향

박재윤(Jae-Yoon Park),이용기(Yong-Ki Lee) 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.2

99m Tc을 이용하는 검사를 받고 CT 검사를 진행했을 때 CT 영상에 99m Tc이 미치는 변화에 대하여 정량적으로 알아보고자 하였다. Resolution phantom과 Water phantom에 99m Tc 740 MBq를 주입 전· 후 80 kVp와 120 kVp로 관전압을 변화시켜 CT Scan하였다. 연구결과 99m Tc 주입 전·후 신호강도는 각각 0.173, 0.241의 감소 하였으며, 공간분해능은 각각 0.090, 0.109로 증가하였다. CT 촬영을 99m Tc의 유효 반감기를 고려하여 99m Tc 의 감마선이 CT에 영향을 미치지 않도록 일정한 시간 후 진행함으로 영상의 변화를 줄일 수 있을 것으로 사료된다. This study examines the changes that 99m Tc causes to CT(Computed Tomography) images quantitatively when CT scans were continuously performed using 99m Tc. With the use of the CT, 99m Tc 740MBq was injected into the Resolution Phantom and Water Phantom, and the tube voltage was changed with 80 kVp and 120 kVp, scanning before and after the injection. The result indicate, by comparing the Signal Intensity according to the presence or absence of the 99m Tc injection with the tube voltage of 120 kVp and 80 kVp, a decrease of 0.173 and 0.241 was observed respectively and the spatial resolution increase of 0.090 and 0.109 was observed respectively. The order of the test should be considered because the gamma rays of the radiopharmaceutical used in the nuclear medicine test do not affect the CT while the effective half-life of the radiopharmaceuticals should be considered for the CT scan to reduce the influence of the gamma rays emitted after the nuclear medicine test, with the possibility to reduce the difference of the results.