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- 저자 : 李晶玉(Lee, Chang Ok) (검색결과 244 건)
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고선량율 근접치료기의 선원교정과 치료실주변 방사선량 측정
이정옥,강정구,문성록,Lee, Jeon-Gok,Kang, Jeong-Ku,Moon, Sun-Rock 대한방사선종양학회 1995 Radiation Oncology Journal Vol.13 No.1
High Dose Rate Remote Afterloading system was installed at Wonkwang University Hospital in January 1994. In this report, the calibration of a Gammamed 12-i High Dose Rate Remote Afterloading system and the radiation survey around the facility after design and construct a shieding room are discussed. The radiation survey of the facility indicates that the use of ordinary concrete shielding of existing room will provide adequate shielding. Also, the methodologies for performing source calibration are presented.
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MCNPX를 이용한 선형가속기의 6 MeV 전자선에 대한 에너지분포 계산
이정옥,정동혁,Lee, Jeong-Ok,Jeong, Dong-Hyeok 한국의학물리학회 2006 의학물리 Vol.17 No.4
본 연구에서는 MCNPX 코드를 사용하여 6 MeV 전자선의 에너지분포를 계산하였다. 이를 위하여 선형가속기(ML6M; Mitsubishi, Japan)의 헤드를 모델화하였다. 전자선의 초기에너지 분포는 가우시안으로 가정하였으며, 이 때 평균에너지는 측정과 계산으로 구한 $R_{50}$과 공기중 선량프로 파일을 평가하여 결정하였다. 결정된 빔 변수를 적용하여 선형가속기 헤드속 주요 위치에서의 전자선 에너지분포를 계산하였다. 어플리케이터 출구에서의 광자에 대한 에너지분포를 이용하여 깊이선량률에서 오염광자의 영향을 분석하였다. The electron energy spectra for 6 MeV electron beam were calculated using a MCNPX code. The head of the linear accelerator (ML6M; Mitsubishi, Japan) was modelled for this study. The energy spectrum of the initial electron beam was assumed to be Gaussian and the mean energy was determined by evaluating the measured and calculated values of $R_{50}$ and dose profiles in air. The energy distributions for electrons and photons at the interested points in the head of the linear accelerator were calculated by appling the Initial beam parameters. The effect of contaminant photons on depth dose curves were estimated by the photon energy spectra at the end of the applicator.
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이이스트 고정 bio칼럼을 이용한 Sb의 화학종분리 및 연속적 수소화물발생법에 의한 감도개선
이정옥,권효식,박용남,Lee, Jeong-Ok,Kwon, Hyo-Shik,Pak, Yong-Nam 대한화학회 2010 대한화학회지 Vol.54 No.6
매우 작은 유리구슬(직경 $100{\mu}m$이하)위에 이이스트를 공유결합시킨 bio컬럼을 제작하여 $Sb^{3+}$와 $Sb^{5+}$를 선택적으로 분리하고 연속적 수소화물 발생법을 이용하여 감도를 개선하였다. 최적 용리조건은 용리액 0.8 M 질산으로 흐름속도 1.0 mL $min^{-1}$이며 수소화물 발생의 최적조건은 HCl 2 M, 환원제로 $NaBH_4$ 3% (w/v), 흐름속도는 0.83 mL $min^{-1}$, 수소화물을 운반하는 아르곤기체의 흐름속도는 50 mL $min^{-1}$ 이었다. 이러한 조건에서 두 화학종의 분리시간은 각각 112초와 354초였다. $200{\mu}L$의 시료를 사용하였을 때 감도는 10 여배 개선되었고 검출한계는 $Sb^{3+}$ 및 $Sb^{5+}$에 대하여 각각 3.0 ppb와 7.0 ppb 이었다. 표준시료를 제작하여 분석한 결과, 정확한 결과를 얻을 수 있었다. Yeast is immobilized upon $100{\mu}m$ CPG(controlled pore glass bead) to separate $Sb^{3+}$ and $Sb^{5+}$. Continuous hydride generation is performed after the bio-column. The optimum conditions are 0.8 M nitric acid as an eluent with the flow rate of 1.0 mL $min^{-1}$ and the optimum conditions for the generation of hydride are 2 M HCl, 3% (w/v) $NaBH_4$ with the flow rate of 0.83 mL $min^{-1}$, Ar carrier gas flow rate of 50 mL $min^{-1}$. Two species are separated at 112 and 354 seconds each. The sensitivity is enhanced by 10 times for $200{\mu}L$ of sample and the detection limits are 3.0 ppb and 7.0 ppb for $Sb^{3+}$ and $Sb^{5+}$, respectively. When compared with the standard samples, this method showed accurate results.
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공업계 교원 자격연수 프로그램에 대한 연수교사의 만족도
이정옥,김판욱(Jung Ok Lee),Pan Wook Kim 대한공업교육학회 1993 대한공업교육학회지 Vol.18 No.2
The main objective of this study was to find basic materiasuse as basic materals to develop the secondary schols for the developing of the secondary school teacher`s training program of technical studies. To accomplish this objective the researcher studied the degree of satisfaction with the inservice training program that obtain the first or second class regular teacher`s qualification. Research methods included both the literature research for a theoretical investigation and the survey research for a empirical investigation. The researcher gave the questionnaire to each of 199 teachers of three group`s technical education, electrical engineering and chemical engineering who took part in the inservice training program in 1992 summer vacation. The researcher received 174 responses to the questionnaire. 173 sheets which were responded by teachers were used for the data processing because 1 sheet was discarded as irrelevent to study. The significant level on statistical research was 5 %. Considering research findings according to the research objectives, the researcher could conclude as follows. 1) The curriculum and processing method about teacher`s training program should be required further examination. 2) Concersning the future of the contents of the training courses, it must be both suitable to the students` current educational curriculum and more professional and broader in scope. 3) With the respect to the methodology used to teach the theories related to their area of expertise, it is more desirable to change step by step into both the discussion method and the project method. 4) In Inservice training program must implement a system of elective courses. So, it will be for teachers to sacrifice their specific interests and deep training courses. 5) The evaluation system and process should be reexamined not to test for the teacher`s estimation but to help directly for practical situation. 6) In training period, the field trip must be increased with respect to the number of courses in their specific subject. And to acquire the knowledge based on industrial production experiences, the training center`s authorities must make plans for use the backbone technologists of the company and for teaching the training teachers in the industrial situations.
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이정옥,박용군,노방환,홍철운,김남균,Lee Jung Ok,Park Young Gun,No Pang Hwang,Hong Chul Un,Kim Nam Gyun 대한의용생체공학회 2004 의공학회지 Vol.25 No.6
본 논문에서는 불안정판(unstable platform)을 이용한 새로운 인체 평형감각 증진용 훈련 시스템을 제안하였다. 본 시스템은 불안정판, 컴퓨터 인터페이스, 다양한 소프트웨어로 구성되어 있다. 불안정판은 기울기 센서와 무선 모듈을 내장한 타원형의 단순한 구조이다. 균형 훈련의 효과를 평가하기 위해 표적으로의 이동시간(moving time to the target)과 표적 내 유지시간(duration time in the target)과 같은 파라미터(parameter)를 측정하였다. 균형 훈련은 2주간 행해졌고, 훈련 프로그램에 따라 피험자를 두 그룹으로 나누었다. 그 결과, sine curve trace (SCT)와 block game의 훈련 프로그램을 이용한 반복적인 훈련을 통해 이동시간은 짧아졌고, 유지시간은 길어졌다 특히, 피험자가 균형을 유지하기 어려웠던 방향에서의 개선이 두드러졌다. 이로써 본 시스템은 훈련 후 피험자의 평형감각을 향상시킬 수 있었고, 효과적인 평형감각 훈련시스템으로써 임상에의 적용 가능성을 확인할 수 있었다. We propose a new training system for the improvement of equilibrium sense using unstable platform. This system consists of unstable platform, computer interface and various softwares. The unstable platform was a simple structure of elliptical-type which included tilt sensor and wireless RF module. To evaluate the effort of balance training, we measured the parameters such as the moving time to the target and duration to maintain cursor in the target of screen. Balance training was carried out for two weeks and we classified the subjects into two groups by the training program. As a result, the moving time was reduced and duration time was lengthened through the repeating training of equilibrium sense using training program of sine curve trace(SCT) and Block game. Especially, there was remarkable improvement at direction which was too difficult for the subjects to balance their body. It was showed that this system had an effort on improving equilibrium sense and might be applied to clinical use as an effective balance training system.
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이정옥 ( Jeong Og Lee ) 현대문학이론학회 2010 現代文學理論硏究 Vol.0 No.43
본 논문은 근대 초기의 연설과 토론을 통해 근대적 말하기의 형성 과정을 밝히는 작업의 출발점으로서, 애국계몽기의 연설과 토론의 수용·정착 과정을 살펴보았다. 애국계몽기 지식인들은 인민들을 계몽하고 새로운 문물과 제도를 설립하여 문명개화와 부국강병을 이룩하고자 연설과 토론, 회의 진행법 등을 교육하였다. 이들이 사용한 연설과 토론 등의 개념은 서구의 공적 스피치에 근원을 두고 있지만, 그 용어는 메이지시대 초기에 후쿠자와가 정립한 것을 그대로 차용한 것이다. 초기에는 연설과 토론을 엄격하게 구분하지 않았지만, 독립협회 토론회 조직된 이후부터 보다 많은 인민들이 참여하여 의견을 개진하고 여론을 형성·수렴하는 토론장이 활성화되면서 토론이 부각되기 시작했다. 또한 협성회와 독립협회 토론회는 애국계몽기 인민들에게 연설과 토론교육을 실행하기 위해 조직된 단체로서, 철저한 회원 관리와 치밀한 조직 구성을 토대로 체계적으로 운영되었다. 앞으로 근대 초기 연설과 토론의 존재 양상을 토대로 연설과 토론이 근대적 말하기가 형성되는 과정에 어떻게 기여했는지, 사회문화적 맥락 속에서 어떻게 생산되고 수용되었는지 등에 대해 면밀하게 고찰해 나갈 것이다. This study examined the process of accepting and settling speeches and debates during the period of patriotic enlightenment as a starting point of research on the formation of modern speaking based on speeches and debates during the early period of modern times. Intellects in the period of patriotic enlightenment educated speeches, debates, methods of leading meetings, etc. in order to enlighten people, promote new cultures and systems, and achieve civilization and wealthy and strong country. The concepts of speeches, debates, etc. used by them originated from Western public speeches, but the terms were borrowed from what Hukujawa Eukichi established during the early Meiji Era. At the beginning, there was no strict distinction between speeches and debates, but with the organization of the Debating Society of the Korean Independence Club, more people participated and stated their opinions and, as a result, discussion forums were activated for forming and collecting public opinions and debates began to be spotlighted. In addition, the debating societies of Baejae School and the Korean Independence Club were organized for executing education on speeches and discussion for people during the period of patriotic enlightenment, and they were operated systematically based on thorough member management and elaborate organizational structure. In future research, we will examine closely how speeches and debates contributed to the formation of modern speaking, how they were produced and accepted in socio cultural contexts, etc. based on the existential pattern of speeches and debates during the early period of modern times.
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