핵의학 영상검사 후 시행된 핵의학 검체검사에서의 영향

문기춘,권원현,김정인,이인원,Moon, Ki Choon,Kwon, Won Hyun,Kim, Jung In,Lee, In Won 대한핵의학기술학회 2014 핵의학 기술 Vol.18 No.1

핵의학과 영상검사 후에 검체검사를 시행할 경우 결과값에 미치는 영향을 알아보기 위해 PET-CT, Gated Myocardial SPECT, DTPA GFR Scan을 시행하기 전 후에 채혈하여 Tumor marker (AFP,CEA,CA19-9), Hormone (TSH,T3,TG,TG Ab)검사를 시행하여 Difference를 구하였다. 대부분의 결과가 10% 이내의 차이를 나타냈지만 Table 7의 sample 2와 Table 8의 sample 1, sample 6, sample 8의 저 농도 값에서 20%를 넘는 차이를 나타내는 경우가 있었다. 그렇지만 cpm값은 Table 7의 sample 2는 984(전), 1057(후) Table 8의 sample 1은 243(전), 301(후) sample 6은 58(전), 64(후) sample 8은 258(전), 203(후)으로 매우 흡사한 값을 나타냈다. 이 같은 값을 바탕으로 볼 때 영상검사를 시행한 후에 검체검사를 시행하더라도 결과값에 미치는 영향은 없는 것으로 판단된다. Purpose: At our hospital blood is collected from a patient before an imaging test, with the concern of any effect possible when a nuclear medicine imaging test and an in-vitro test are carried out at the same time. However, occasionally, the blood collection is performed after an imaging test, with the reasons that the patient is not properly guided or the patient doesn't follow the guide correctly. In that case, we prefer to gather blood again after a few days. The purpose of this study is not only to see whether there is any effect of an imaging test on the result of the in-vitro test performed with the blood collected after the imaging test, but also to study how many days waiting after each test is appropriate to take a blood sample, if the effect exists. Materials and Methods: From September to October 2013, blood were collected from 13 patients in our hospital regardless of age and sex each time before and after the injection of the radioactive isotope from the tests : PET-CT, Gated Myocardial SPECT, and DTPA GFR Scan. Considering a half-life, AFP, CA19-9, CEA, TSH, and T3 were carried out right after the blood collection. In case of an iodine therapy, blood were taken each time before and after taking radioactive iodine, and, after AFP, CA19-9, and CEA, the difference between them in consistency and in cpm were compared. Results: With 10 patients after the imaging tests and 3 patients after the iodine therapy, their serum cpm was over 10,000. Over time, the cpm decreased in accordance with the half-life ($^{18}F$ 110minutes, $^{99}mTc$ 6hours, $^{201}Tl$ 72hours, $^{131}I$ 7days). Between the two cases, one before and the other after the injection of the radioactive isotope, the cpm and the results of AFP, CA19-9, CEA, TSH, and T3 from three patients each test, PET-CT, Gated Myocardial SPECT, and DTPA GFR Scan, were very similar. In addition, in case of an iodine therapy, there was also not a meaningful difference in the cpm and the results of AFP, CA19-9, and CEA, from three patients in an iodine therapy, between the two cases, one before and the other after taking the radioactive iodine. Conclusion: In case a blood collection was performed after the imaging test which required a radioactive isotope injection, the cpm increased, differently according to the kind of the radioactive isotope. However, the results of the in-vitro tests like AFP, CA19-9, CEA, TSH, T3, etc were nearly not affected. As the result, it's considered that there will not be any significant effect also from other tests, as the result from the performed seven tests.

즐거움과 보람 주는 연구소 만들어야

이인원,Lee, In-Won 한국과학기술단체총연합회 2005 과학과 기술 Vol.38 No.12

한국의 레이저개발 초창기 이야기

이인원,Lee, In-Won 한국광학회 2010 광학과 기술 Vol.14 No.2

KAIST, KAERI, KRISS 초창기 광학연구의 체험적 이야기

이인원,Lee, In-Won 한국광학회 2015 광학과 기술 Vol.19 No.3

후향계단 주위의 난류 박리재부착유동에서의 벽압력변동의 통계적 특징

이인원,성형진,Lee, In-Won,Sung, Hyung-Jin 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.2

Laboratory measurements were made of wall pressure fluctuations in a separated and reattaching flow over a backward-facing step. An array of 32 microphones along the streamwise direction was utilized. Various statistical properties of pressure fluctuations were scrutinized. The main emphasis was placed on the flow inhomogeneity along the streamwise direction. One point statistics such as the streamwise distribution of rms pressure and autospectra were shown to be generally consistent with other studies. The coherences and wavenumber spectra in the streamwise directions were indicative of the presence of dual modes in pressure; one is the large-scale vortical structure in low frequency and the other is the boundary-layer-like decaying mode in high frequency.

신경망을 이용한 강박스거더교의 손상평가

이인원,오주원,박선규,김주태,Lee, In Won,Oh, Ju Won,Park, Sun Kyu,Kim, Ju Tae 한국강구조학회 1999 韓國鋼構造學會 論文集 Vol.11 No.1

신경망을 이용하여 강박스거더교의 손상을 평가하였다. 최근, 신경망을 이용한 손상평가는 구조공학분야에서 많은 연구가 진행되고 있다. 이것은 기존방법의 한계를 극복하고자 하는 새로운 시도로서 본 연구에서는 강교의 손상평가에 적용되었다. 신경망 학습을 위한 자료는 이동하중에 의한 교량의 가속도 응답으로부터 얻었다. 유한요소모델이 우선 정의되고 여기에 5, 10, 15 및 20%의 손상을 가정하였다. 평가단계에서는 학습한 손상은 물론 학습하지 않은 손상도 잘 감지하였다. 본 연구에서는 손상부위가 몇 개의 부위로 한정되었으며 현장의 적용을 위해서는 보다 많은 연구가 필요하다. Damages of a steel box girder bridge are detected using neural networks. Damage detection using neural networks has increasing momentum in structural engineering. It is a new effort to overcome the limitations of the conventional analytical approaches and applied to the damage detection of a steel box-girder bridge. Data sets for training neural networks are obtained from the acceleration response of the bridge under moving load. Finite element model is first defined and damages of 5, 10, 15 and 20% are assumed in the model. Not only the trained damages but untrained damages are detected in the assessment stage. The untrained damages can be detected with acceptable errors. Because the number of damaged locations are limited to a few parts, more researches are needed to put this technique into practice.

회전관성 및 전단변형이 변화곡률 아치의 고유진동수에 미치는 영향

오상진,이병구,이인원,Oh, Sang Jin,Lee, Byoung Koo,Lee, In Won 한국강구조학회 1997 韓國鋼構造學會 論文集 Vol.9 No.4

이 논문에서는 회전관성과 전단변형이 변화곡률 아치의 고유진동수에 미치는 영향을 분석하였다. 임의의 변화곡률을 갖는 등단면 아치의 자유진동을 지배하는 미분방정식을 유도하였으며, 유도된 미분방정식에 회전-회전, 회전-고정 및 고정-고정의 단부조건을 갖는 포물선, 원호 및 타원 아치를 적용하여 수치해석하였다. 해석결과로서 무차원 변수인 아치높이 지간길이비 및 세장비 변화에 따론 최저차 4개의 무차원 고유진동수를 산출하였다. The main purpose of this paper is to investigate the effects of rotatory inertia and shear deformation on the natural frequencies of arches with variable curvature. The differential equations are derived for the in-plane free vibration of linearly elastic arches of uniform stiffness and constant mass per unit length. The governing equations are solved numerically for parabolic, circular and elliptic geometries with hinged-hinged, hinged-clamped and clamped-clamped end constraints. For each cases, the four lowest frequency parameters are presented as functions of the two dimensionless system parameters; the arch rise to span length ratio, and the slenderness ratio.

자기 누설 신호의 측정을 이용한 배관의 결함 깊이 추정

문재경 ( Jae Kyoung Moon ),이승현 ( Seung Hyun Lee ),이인원 ( In Won Lee ),박관수 ( Gwan Soo Park ),이민호 ( Min Ho Lee ) 한국센서학회 2006 센서학회지 Vol.15 No.5

자유 숲놀이에 나타난 유아의 놀이 경험

이인원(Lee In-Won),최기영(Choi Kee-Young) 한국열린유아교육학회 2007 열린유아교육연구 Vol.12 No.2

본 연구는 유아들이 교사의 계획된 지도 없이 숲에서 자유롭게 놀이하며 갖는 경험을 알아보기 위하여 수행되었다. 연구 참여자는 유치원에 재원하고 있는 만 5세 유아 15명이었다. 2006년 9월 첫째 주부터 2006년 12월 셋째 주까지 매주 토요일 14회에 걸쳐 숲놀이가 이루어졌으며 이를 참여관찰 하였다. 수집된 자료는 필사를 거쳐 질적으로 분석하여 5가지의 범주로 정리되었다. 분석 결과 유아들은 자유로운 숲놀이에서 앎을 위한 여정 떠나기, 나를 세상 밖으로 드러내기, 공동체 속으로 들어가기, 상상의 세계에서 놀아보기, 실패 걱정 없이 도전하기를 경험하는 것을 알 수 있었다. 본 연구에서 나타난 결과는 유아들이 숲이라는 자연에서 교사의 지시나 설명 없이 자유롭게 놀이하는 과정에서 드러난 자연에 대한 반응과 자연에서 놀이하는 유아의 본질적인 성향을 이해하는데 도움을 줄 수 있다. The purpose of this study is to reveal the meaning of young children's experiences at free play in the forest. The participants were 15 5-year-old children in kindergarten. The data was collected through participant observation for 13 weeks in the forest. The observation time was 100 minutes a week. All data was categorized using content analysis and meaning analysis. The themes were integrated by five themes according to meaning. First, young children feel curiosity for nature in free play in forest. and search and observe things and environment of nature. They deduct some result combining knowledge that with information that they already have and observations. Therefore, they experience a journey of knowing through play in nature. Second, young children appreciate various states and phenomenona of the forest. they experience themselves in words and body. Third, young children are involved in lively interaction playing with ages freely in forest and from relation with ages. The social actions in forming relation to play with peers, to cooperate, to help, to give, to exchange, to compete, to promise justice and so on. They experience to becoming community members. Fourth young children experience the world of imagination through the use of unstructured natural objects in the forest. Their play by imagination is thematic fantasy play, role play, imitative play. Fifth, young children try various play with freedom and rich play material. They experience to challenges without worry of failure. Young children try to practice new body exercise and invent new play and methods to play successfully. They experience that the solving of problems and phenomenon and social problem with peers.

숲체험 활동이 유아의 일상적 스트레스 감소에 미치는 영향

이인원(In Won Lee) 한국열린유아교육학회 2014 열린유아교육연구 Vol.19 No.6

본 연구는 숲체험 활동이 유아의 일상적 스트레스 감소에 미치는 영향을 알아보기 위하여 수행되었다. 연구대상은 C시에 소재한 2개유치원 만 4세와 5세반 각각 실험집단 20명 비교집단 20명씩 배정하였다. 실험집단의 유아에게 숲체험 활동을 10주간 실시하였고, 비교집단의 유아에게는 누리과정을 일반적으로 적용하였다. 숲체험 활동은 매일 1시간씩 유치원 옆 숲에서 이루어졌다. 일상적 스트레스 감소 정도를 집단별로 비교하기 위하여 ‘한국 유아의 일상적 스트레스 척도(Kotran Preschool Daily Stress Scale: KPDSS)’를 사용하여 측정한 감소분에 대한 t-test를 실시하였다. 그 결과 숲체험 활동에 참여한 실험집단의 유아가 유의미하게 일상적 스트레스가 감소한 것으로 나타났다. 따라서 숲체험 활동은 만 4세와 5세 유아의 일상적 스트레스 감소에 긍정적인 영향을 주었다. The purpose of this study is to identify the effects of forest experience activities on young children’s daily stress reduction. Accordingly, a forest play activities program was developed for 4-, and 5-year old children. The experimental group engaged in the forest experience activity. The comparative group engaged in general kindergarten activities. The students engaged in their respective activities for 11 weeks, for approximately two hours a day. Data were analyzed with mean, standard deviation, and t-test on the pre and post-score in order to find any significant difference in daily stress between the two groups. The results of this study are as follows. A significant improvement was found in the daily stress reduction for participants in the forest experience activity program. The experimental group showed a significant reduction in children’s daily stress in 4-, and 5-year old children. Significant effects were found in the experimental group in all factors of the sub-area of daily stress, i.e., wound, discouragement, and anxiety.