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림프종 환자에서의 갈륨, Tl-201 그리고 Tc-99m MIBI 섭취의 비교
천경아 ( Kyung Ah Chun ),조인호 ( Ihn Ho Cho ),원규장 ( Kyu Chang Won ),이경희 ( Kyung Hee Lee ),이형우 ( Hyung Woo Lee ),현명수 ( Myung Soo Hyun ),이재태 ( Jae Tae Lee ),이규보 ( Kyu Bo Lee ) 영남대학교 기초/임상의학연구소 2002 Yeungnam University Journal of Medicine Vol.19 No.2
Purpose: Ga-67 scintigraphy has been used for the evaluation of tumors, especially lymphoma. Recently, Tl-201 and Tc-99m MIBI were also used to tumor imaging. Tl-201 and Tc-99m MIBI had better physiologic characteristics than Ga-67, so we studied 32 biopsy proven lymphoma patients (male 24, female 8, mean age 46 years) with Ga-67, Tl-201 or Tc-99m MIBI and compared the scan findings. Materials and Methods: Twenty-three of 32 patients were injected 74-111 MBq (2-3 mCi) of Tl-201, before chemotherapy and imaged with dual-headed SPECT (Prism 2000, Picker, USA) at 30 minutes after injection. Delayed images were obtained after 3 hr in 8 patients. Twenty seven of 32 patients were injected 740 MBq (20 mCi) of Tc-99m MIBI and imaged at 30 minutes after injection. 111-185 MBq (3-5 mCi) of Ga-67 was injected in 12 patients and imaged at 48 and 72 hours after injection. Twenty eight patients were diagnosed as non-Hodgkin`s lymphoma and others were Hodgkin`s lymphoma. Results: Twenty patients were positive on Tl-201 scan and 3 patients showed negative findings. One of these 3 patients, Tc-99m MIBI and Ga-67 scan were positive. Twenty two patients were positive on Tc-99m MIBI scan and 5 patients showed negative findings. One of these 5 patients, Tl-201 was positive and 2 were positive on Ga-67 scan. Ten of 12 patients showed positive findings on Ga-67 scan. The sensitivity of these agents were 83.3%, 87.0% and 81.5% for Ga-67, Tl-201 and Tc-99m MIBI, respectively. The sensitivity was highest in Tl-201 scan, but there were no significant differences among three tests. In this study, there was no significant difference of uptake ratios between early and delayed images of Tl-201. Conclusion: Scintigraphy with Tl-201 and Tc-99m MIBI in lymphoma patients have similar sensitivity with Ga-67.
우선순위 계승 프로토콜을 이용한 실시간 서버 모델 연구
천경아(Kyung-Ah Chun),박홍진(Hong-Jin Park),김영찬(Young-Chan Kim),전성익(Sung-Ik Jun) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅳ
실시간 어플리케이션의 시간제약성을 예측하기 위해서는 우선순위 계승 프로토콜(priority inheritance protocol)을 이용하여 우선순위 반전 문제(priority inversion problem)를 해결하여야 한다. 그리고 이를 바탕으로 시스템의 오버헤드에 영향을 끼치지 않으면서 서버에 대한 보다 나은 선점가능성을 제공할 수 있는 실시간 서버 모델이 필요하다. 그러나 기존 시스템의 실시간 서버 모델은 높은 선점가능성과 낮은 오버헤드간의 트레이드오프를 해결하지 못하고 있다. 따라서, 본 논문에서는 이러한 문제점을 해결한 연관 우선순위 작업자 모델(Associative prioritized worker model)을 설계하였다.
실시간 시스템을 위한 Statechart에서의 동작 우선순위 기법
천경아(Kyung-Ah Chun),박홍진(Hong-Jin Park),김영찬(Young-Chan Kim) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.1A
Statechart는 기존 상태추이도를 확장한 것으로서, 반응시스템을 명세하기 위해 제안된 가시적 정형기법이다. 그러나 statechart에서의 비결정성은 실시간 시스템에서의 예측가능성에 심각한 문제를 유발할 수 있다. 또한, 이를 해결하기 위한 기존의 우선순위 표현방법은 statechart의 비결정성을 완전히 해결하지 못하고 있을 뿐 아니라 실시간 시스템에서 요구하는 다양하고 동적인 우선순위 변화를 표현하기 부적합하다. 이와 같은 문제점을 해결하기 위하여 본 논문에서는 미리 예측가능하고 동적으로 우선순위를 변화시킬 수 있는 동적 우선순위 개념을 제안하다.
천자혜,김현아,곽미정,김효선,박선경,김문숙,최애리,황지인,김윤숙,Chun, Ja-Hae,Kim, Hyun-Ah,Kwak, Mi-Jeong,Kim, Hyuo-Sun,Park, Sun-Kyung,Kim, Moon-Sook,Choi, Ae-Lee,Hwang, Jee-In,Kim, Yoon-Sook 한국의료질향상학회 2018 한국의료질향상학회지 Vol.24 No.2
Purpose: Falls are one of the most frequent health events in medical institutions, however, they can be predicted and prevented. The Quality Improvement Nurse Society clinical practice guideline Steering Committee developed the Clinical Practice Guideline for the assessment and prevention of falls in adult people. The purpose of this study was to assess the risk factors for falls in adults aged 19 years and older, to present an evidence for preventing falls, formulate a recommendations, and indicators for applying the recommendations. Methods: This clinical practice guideline was developed using a 23-step adaptation method according to the Handbook for clinical practice guideline developer (version 1.0) by National Evidence-based Healthcare Collaborating Agency. Evidence levels and recommendation ratings were established in accordance to SIGN 2011 (The Scottish Intercollegiate Guidelines Network). Results: The final 15 recommendations from four domains were derived from experts' advice; 1) assessment of risk factor for falls in adult 2) preventing falls and reducing the risks of falls or falls-related injury 3) management and reassessment after a person falls 4) leadership and culture. Conclusion: This clinical practice guideline can be used as a basis for evaluation and prevention of fall risk factors for adults, to formulate recommendations for fall risk assessment and fall prevention, and to present monitoring indicators for applying the recommendations.
천경아,김성숙,Chun, Kyung-Ah,Kim, Sung-Sook 배재대학교 자연과학연구소 2002 自然科學論文集 Vol.12 No.1
연결 그래프의 꼭지점에 자갈이 분포되어 있다고 하자. 한 꼭지점에서 두 개의 자갈을 취하여 한 개의 자갈만을 인접한 꼭지점에 보내는 이동을 할 때, 자갈이 분포될 수 있는 모든 경우에서 임의의 꼭지점에 한 개의 자갈을 보내기 위해 필요한 최소의 자갈의 수를 그 그래프의 pebbling number 라고 한다. 이 논문에서 Petersen Graph의 pebbling 수를 계산하였고 complete bipartite 그래프 $K_{m,n}$과 꼭지점의 수 h가 4개 이상인 complete 그래프의 categorical product 의 pebbling number가 (m+n)h 이 됨을 보였다. Let G be a connected graph on n vertices. The pebbling number of graph G, f(G), is the least m such that, however m pebbles are placed on the vertices of G, we can move a pebble to any vertex by a sequence of moves, each move taking two pebbles off one vertex and placing one on an adjacent vertex. In this paper, we compute the pebbling number of the Petersen Graph. We also show that the pebbling number of the categorical Product G.H is (m+n)h where G is the complete bipartite graph $K_{m,n}$ and H is the complete graph with $h(\geq4)$ vertices.
천경아,변재영,이재문,하현권,김현,박영하,김일순,김종우,박용휘,신경섭,Chun, Kyung-Ah,Byun, Jae-Young,Lee, Jae-Mun,Ha, Hyun-Kwon,Kim, Hyun,Park, Young-Ha,Kim, Il-Sun,Kim, Jong-Woo,Bahk, Yong-Whee,Shinn, Kyung-Sub 대한영상의학회 1993 대한영상의학회지 Vol.29 No.2
Adult intussusception is a rare condition, unlike in children. There is an identifiable bowel lesion as a leading point in most of cases. Retrospectively we reviewed 22 patients with adult intussusception, and analyzed CT scans of 13 patients during the last 5 years. Twenty of the 22 patients had various causes of intussusception and 7 patients were as sociated with primary malignancy, 5 patients with benign tumor, and 4 patients with adhesive band. CT scans of 13 cases all showed characteristic target appearance or sausage-like soft tissue mass within the bowel, suggesting intussusception. In eleven of the 13 patients(84.6%) an intussuscepting mass was identified on CT scan as the lead point. Specific diagnosis for the cause of intussusception could be made by CT in four of 13 cases (three lipomas and one mucocle). In conclusion. CT is useful not only for the diagnosis but also for the evaluation of the leading causes of intussusception. Especially, CT could determined the exact causes of intussusception in cases of lipoma and mucocele.