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이환모,김호중,김긍년,안풍기,천자혜,김양수,신혜선,김인숙,정혜경,김영아,채형기,박인영 한국의료QA학회 2009 한국의료질향상학회지 Vol.15 No.2
연구배경: 수술적 치료가 필요한 척추관협착증 환자들은 주로 60세 이상의 고령환자로장기간의 입원 시 기회 감염의 증대와 불필요한 의료비의 증대를 가져오게 되며, 수술후환χ}들의 재원일수의 증가는병원의 병상가 동률을감소시키고, 전공의에게는불필요한 업무를 증가시킨다. 연구목적: 비용·효과면에서 최적화된 진료지침의 개발은 불필요한 의료비의 감소및 Hospital Induced Complication을 줄여 환자만족도를증진시킬 수 있으며, 각 환자에 대한전공의 업무를 줄일 수있다. 의료기관: 서울특별시에 소재한 2,075병상의 종합전문 요양기관 연구방법: 정형외과및 신경외과의 척추관협착증환자 의 처방을 비교하여 최적의 표준진료지침을 개발하고 최종적으로 CP Master Program (EMR 프로그램)에 입력하여 환자에게 적용하였다. 연구결과': CP 적용전, 후비교를통해 재원일수는 3.8일 이 감소하였으며, 이에 따라 병상가동률 및 진료수익이 증가했으리라고 예상되며 현재 비교검토중이다. 또한,CP 개발및 CP Master Program의 사용을 통한 전공의 업무감소에 대해 검토하고 있다.
대장 통과 지연성 만성 특발성 변비에 대한 섬유소의 효과
정문기(Moon Gi Chun),송치욱(Chi Wook song),문정섭(Jeong Seop Moon),진윤태(Yoon Tae Jeen),엄순호(Soon Ho Um),김창덕(Chang Duck Kim),류호상(Ho Sang Ryu),현진해(Jin Hae Hyun) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.4
N/A Background/Aims: Chronic idiopathic constipation has been thought to be related to decreased intake of dietary ttber, and high fiber diet was recommended as an initial therapy for consitipated patients. So we estimated the effects of dietary fiber(psyllium husk) on symptoms and colonic transit time in patients with slow transit constipation. Methods: We measured colonic transit time using radioopaque markers in 74 controls and 68 patients with chronic idiopathic constipation. After 4 week treatment of psy]lium husk(3.25g/pack, t.I.d.), we re-evaluated symptoms and colonic transit time in 37 patients with slow transit constipation. Results: In controls, mean bowel frequency was 5.1/week, total colonic transit time was 16.9 hours, and segmental colonic transits were 4.0 hours for right, 5.1 hours for left, and 7.8 hours for rectosigmoid colon. Among 68 patients with chronic idiopathic constipation, 37 patients had delayed total colonic transit time (mean-t 2SD). In these patients with slow transit constipation, mean bowel frequency was 2.0/week, total colonic transit time was 56.6 hours, and segmental colonic transits were 16.2 hours for right, 22.4 hours for left and 18.0 hours for rectosigmoid colon. After treatment, bowel frequency increased from 2.0/week to 4.3/week, and total colonic transit time decreased from 55.6 hours to 37.7 hours. Right, left, and rectosigmoid segmental colonic transit time also decreased from 16.2 to 9.8 hours, 22.4 to 15.0 hours and 18.0 to 12.5 hours, respectively. We found 3 patients with abdominal bloating and I patient with abdominal pain, but no patients had any serious complications. Conclusions: In patients with slow transit constipation, psyllium husk improved symptoms and colonic transit without serious side effect. (Korean J Gastroenterol 1996; 28:513 - 519)
효과적인 다채널 직접 메모리 접근 관리를 통한 멀티포트 메모리 컨트롤러의 성능 향상 방법
천익재(Ik-Jae Chun),여준기(Chun-Gi Lyuh),노태문(Tae Moon Roh),이문식(Moon-Sik Lee) 대한전자공학회 2014 전자공학회논문지 Vol.51 No.4
본 논문에서는 모바일 시스템 환경에서 멀티포트 메모리 컨트롤러의 특성을 고려한 직접 메모리 접근 컨트롤러를 사용하여 고속 데이터 전송을 효과적으로 수행하는 메모리 액세스 방법을 보인다. 제안된 직접 메모리 접근 컨트롤러는 여러 개의 직접 메모리 접근 채널을 제어 할 수 있는 통합 채널 관리 기능을 제공하며, 그 채널들은 물리적으로 분리되어 서로 독립적으로 동작한다. 제안된 직접 메모리 접근 방법을 통한 데이터 전송을 이용함으로써 읽기 동작에 대하여 72%, 쓰기 동작에 대하여 69%의 데이터 전송 성능 향상을 얻었다. 특히, 4 채널 접근 모드에 대해서 제안된 방법이 기존 직접 메모리 접근 방법에 비하여 63% 적은 전체 전송 사이클을 가짐으로써 전송 성능 향상에 기여할 수 있음을 보인다. This paper presents an effective memory access method for a high-speed data transfer on mobile systems using a direct memory access controller that considers the characteristics of a multi-port memory controller. The direct memory access controller has an integrated channel management function to control multiple direct memory access channels. The channels are physically separated and operate independently from each other. Experimental results show that the proposed direct memory access method improves the transfer performance by up to 72% and 69% on read and write transfer cycles, respectively. The total number of transfer cycles of the proposed method is 63% less than in a commercial method under 4-channel access.
Clinicopathological features of the intraductal papillary neoplasms of the intrahepatic bile duct
Gi-Woong Jang,Shin Hwang,Yong-Joo Lee,Ki-Hun Kim,Kwang-Min Park,Chul-Soo Ahn,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Sung-Gyu Lee 한국간담췌외과학회 2012 한국간담췌외과학회지 Vol.16 No.4
Backgrounds/Aims: This study is intended to investigate the clinicopathological features of the intraductal papillary neoplasms of the intrahepatic bile duct (IPNB), especially focused on malignant changes. Methods: From the institutional database of liver resection cases (Asan Medical Center, University of Ulsan College of Medicine), 18 patients who met the definition of IPNB were selected. They had undergone liver resection between February 2002 and October 2006; thus, the follow-up period was more than 5 years. Results: Of the 18 patients, 11 patients were male. Their mean age was 61.3±6.7 years. There were no differences between the non-malignant and malignant lesions, in the comparison of the CEA levels (5.6±2.7 vs.12.6±31.1 ng/ml, p=0.439) and the CA19-9 levels (29.2±34.7 vs.31.9±30.2 ng/ml, p=0.871). The common radiologic findings were: intraductal growing mass in 10; bile duct dilatation in 6; and saccular duct dilatation in 2. Left and right hepatectomies were performed in 15 and 3, respectively. Five patients showed benign lesions of IPNB, and 13 patients revealed malignant lesions of intraductal papillary adnocarcinoma or cholangiocarcinoma. All 4 patients with benign lesions survived for a mean period of 53 months without recurrence. In 13 patients with the malignant lesions, 1-year, 3-year, and 5-year survival rates were 100%, 84.6%, and 59.2%, respectively. Conclusions: We concluded that intrahepatic IPNB is a rare type of biliary neoplasm which includes a histological spectrum, ranging from benign disease to invasive malignancy. The long-term survival was anticipated after complete curative resection. (Korean J Hepatobiliary Pancreat Surg 2012;16:138-141)
운전효율향상을 위한 VVCF-유도전동기 구동시스템의 속도제어
문상천,이승철,정승기 광운대학교 신기술연구소 1996 신기술연구소논문집 Vol.25 No.-
본 논문은 가변전압일정주파수-유도전동기 구동시스템의 효율개선방법을 제안하였다. 제안된 제어기를 사용하면 유도전동기를 부하조건에 무관하게 정격속도에서 운전할 수 있으며 최대효율상태의 운전이 가능하다. 전동기의 속도제어는 역기전력 추정을 통하여 간접적으로 제어되므로 기계적인 속도센서의 부착이 필요없다. 역기전력은 입력전력의 기본파성분과 본문에서 유도된 수식의 적용으로 추정되었다. 제어 알고리즘은 16bit 마이크로컨트롤러 시스템을 구성하여 수행되었으며 유도전동기의 입력전압은 사이리스터 교류전압제어기를 이용하여 제어하였다. 시뮬레이션과 실험결과로 제안된 제어방식이 경부하조건에서 유도전동기의 입력전력을 현저히 감소시킴을 보였다. This paper proposes an efficiency improvement method of VVCF-induction motor drive system. With the proposed control the motor runs at the rated speed where the motor shows its rnaximurn efficiency, regardless of load condition The motor speed is controlled indirectly with the counter emf estimation which eliminates the rnechanical speed sensor. The counter emf is estimated by detecting the fundamental component of input current and applying the formula derived in this paper. The control algorithm is realized with a 16 bit microcontroller system that controls the input voltage of an induction motor through a thyrister ac voltage controller. Simulation and experimental results confirm that the proposed control significantly reduces the input power of an induction motor drive under lightly loaded condition.
Pretransplant Hepatic Malignancy Increases Risk of De Novo Malignancy after Liver Transplantation
Gil-Chun Park,Shin Hwang,Chul-Soo Ahn,Ki-Hun Kim,Deok-Bog Moon,Tae Yong Ha,Gi Won Song,Dong-Hwan Jung,Young-In Yoon,Hui-Dong Cho,Jae-Hyun Kwon,Yong-Kyu Chung,Sang-Hyun Kang,Jin-Uk Choi,I-Ji Jung,Sung 대한의학회 2020 Journal of Korean medical science Vol.35 No.11
Background: Hepatocellular carcinoma (HCC) recurrence and development of de novo malignancy (DNM) after liver transplantation (LT) are the major causes of late recipient death. Methods: We analyzed the incidence of extrahepatic DNM following living donor LT according to the status of pretransplant hepatic malignancy. We selected 2,076 adult patients who underwent primary LDLT during 7 years from January 2010 to December 2016. Results: The pretransplant hepatic malignancy group (n = 1,012) showed 45 cases (4.4%) of the following extrahepatic DNMs: posttransplant lymphoproliferative disease (PTLD) in 10; lung cancer in 10; stomach cancer in 6; colorectal cancer in 5; urinary bladder cancer in 3; and other cancers in 11. The pretransplant no hepatic malignancy group (n = 1,064) showed 25 cases (2.3%) of the following extrahepatic DNMs: colorectal cancer in 3; stomach cancer in 3; leukemia in 3; lung cancer in 3; PTLD in 2; prostate cancer in 2; and other cancers in 9. Incidences of extrahepatic DNM in the pretransplant hepatic malignancy and no hepatic malignancy groups were as follows: 1.1% and 0.5% at 1 year, 3.2% and 2.0% at 3 years, 4.6% and 2.5% at 5 years, and 5.4% and 2.8% at 8 years, respectively (P = 0.006). Their overall patient survival rates were as follows: 97.3% and 97.2% at 1 year, 91.6% and 95.9% at 3 years, 89.8% and 95.4% at 5 years, and 89.2% and 95.4% at 8 years, respectively (P < 0.001). Pretransplant hepatic malignancy was the only significant risk factor for posttransplant extrahepatic DNM. Conclusion: Our results suggest that patients who had pretransplant hepatic malignancy be followed up more strictly because they have a potential risk of primary hepatic malignancy recurrence as well as a higher risk of extrahepatic DNM than patients without pretransplant hepatic malignancy.