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이정목 ( Jung Mok Lee ),김문권 ( Moon Kwon Kim ),장정란 ( Jeong Ran Jang ),김수동 ( Soo Dong Kim ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
모바일 컴퓨팅이 보편화 되고 기술이 발전 할수록, 모바일 환경에 가지고 있는 제약사항은 해결 해야 할 과제로 남아있다. 모바일 디바이스의 제약된 자원, 불안정한 네트워크, 서비스 접근성 등은 모바일 환경을 안정적으로 운영되기 힘든 요인이다. 이는 사용중인 어플리케이션의 서비스가 정지되거나 네트워크 전송의 실패 등의 문제가 빈번히 발생하는 원인이 된다. 본 연구에서는 이러한 문제 해결하기 위한 방법으로 정보를 효과적으로 수집하고 데이터를 분석하는 차세대 모바일 환경인 동적 모바일 생태계를 위한 모니터 시스템을 제시한다.
100kW급 소형가스터빈용 이중 연료 분사형 희박 예혼합 버너의 혼합 특성에 따른 NOx 및 CO 배출 저감 성능
박정목(Jung Mok Park),김민국(Min Kuk Kim),이상민(Sang Min Lee),조주형(Ju Hyeong Cho),김한석(Han Seok Kim),안국영(Kook Young Ahn) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Mixing characteristics has been investigated with a lean premixed swirl-stabilized burner having dual-staged fuel injection arrays. NOx and CO emissions were observed with various ratio of fuel stages. Two dimensional fuel concentration fields were measured at the burner exit by using gas sampling probe. Mixedness of fuel was mainly controlled by fuel staging thereby mixing length. Flame structure was studied by using chemiluminescence image of OH radical. And emission characteristics of NOx and CO were analysed. An optimal case of fuel staging was determined by considering flame stability, flash-back and emissions.
Sim2Real 학습을 활용한 무기체계 탐지성능 향상에 대한 연구
이경재(Gyeong-Jae Lee),마정목(Jung-Mok Ma) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.7
딥러닝 기반의 객체탐지 모델에서 새로운 객체에 대한 탐지를 위해서는 해당 객체가 포함된 방대한 이미지를 모델에 학습시켜야 한다. 하지만 충분한 이미지 데이터를 확보하기 힘든 환경에서는 모델을 학습시키기에 불리한 면이 있으며 국방 분야가 대표적인 예이다. 이와 같은 문제를 해결하기 위해 데이터 생성에 해당되는 시뮬레이션 가상환경에서의 3D 모델 기반의 합성이미지를 이용하여 컴퓨터가 학습할 수 있는 충분한 양의 데이터풀을 확보하고 객체탐지 모델을 학습시킬 수 있다. 이를 Sim2Real 학습이라고 하며, Sim2Real의 성능을 보장하기 위해서는 도메인 격차를 줄이는 과정이 필요하다. 본 연구에서는 도메인 격차를 줄이는 도메인 적응화 기법 중 하나인, 가상의 도메인에서 수집한 학습데이터로 학습한 객체탐지 모델의 가중치를 가지고 실제 도메인에서 수집한 이미지로 재학습하는, 미세조정 과정을 수행했을 때 성능 차이를 비교하여 도메인 적응화 기법이 실제로 탐지성능에 유의미한 영향을 미치는지 분석하고자 하였다. 실험 결과 적은 양의 실제이미지를 가지고 미세조정을 통해서 유의미한 성능 향상이 있음을 보았다. 이는 충분한 양과 질을 가진 학습용 이미지를 구하기 힘든 국방 분야에서, 객체탐지 모델을 학습하는 한 방향성을 제시해줄 수 있다. The detection of a new object in a deep learning-based object detection model requires the model to be trained with many images containing the objects. On the other hand, in an environment where it is difficult to obtain sufficient image data, there is a disadvantage in training a model, and the defense field is the representative example. The 3D model-based synthetic image in the simulated virtual environment corresponds to data generation to solve this problem by preparing a sufficient data pool for the computer to learn the object detection model. This is called Sim2Real learning, and a process of reducing the domain gap is required to guarantee the performance of Sim2Real learning. This study performed a fine-tuning process of re-learning with images collected from a real domain with weights of object detection model learned with synthetic images collected from the virtual domain, which is one of the domain adaptation techniques to reduce domain gap. This study analyzed whether the domain adaptation technique effectively detects performance by comparing the differences in results. As a result of the experiment, there was significant performance improvement through fine-tuning with a small number of real images. This can suggest a direction for learning object detection models in the field of national defense, where it is not easy to obtain training images of sufficient quantity and quality.
Rat의 복강내에 투여한 5-fluorouracil-polyglycolic acid 제형이 장기에 미치는 영향에 관한 연구
강대영,송규상,최정목,노승무,정경수,오정연,김진향,양준묵,최선웅,이진호,조준식,민병무,김용백,김창식,박근성,김승영,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
For more effective intraperitoneal chemotherapy, the authers made 5-fluorouracil-polyglycolic acid composite disks(FU-PGA disks) with 5-fluorouracil and polyglycolic acid, a biodegradable polymer. We inserted the FU-PGA disk into the peritoneal cavites of Sprague-Dawley male rats, the control and three experimental groups; one FU-PGA disk insert group(300mg/kg), two FU-PGA disk insert group(600mg/kg), and three FU-PGA disk insert group(900mg/kg). The control group received a similar number of PGA disk inserts. A pharmacokinetic study was performed to measure the 5-fluorouracil concentration in the peritoneal fluid, blood, and tissues(liver, kidney and heart) at 24 hours, 72hours and 168 hours after insertion of the FU-PGA disk. Light and electron microscopic studies were done. The results were as follows: 1) The number of white blood cells and platelets decreased after FU-PGA insertion. The degree was proportional to the duration and amounts inserted. The change in the number of red blood cells varied slightly. 2) Light microscopically, slight changes were noted at 168 hours in the 3 disk insert group (900mg/kg). Mild fatty change and hepatocyte degeneration around the central veins of the liver were noted, with vacuolar degeneration in the proximal convoluted tubules of the kidney. 3) Electron microscopically,the liver showed focal increases of lipid droplets in the hepatocytes, and irregular nuclear membrane with focal nucleolar segregation of the fibrillar and granular elements. Also the double membranous structure of the hepatocytes and Kupffer cells was widened with bleb formation. The kidney showed wide separation of the nuclear double membrane in the proximal convoluted tubular cells and mesangial cells, with vacuolation and myelin figure formation in the mitochondria of the proximal convoluted tubular cells, at 72 hours and 168 hours in the 2 to 3 FU-PGA insert groups. The heart showed focal loss of cristae,vacuolation and myelin figure formation in the mitochondria of the 2 to 3 FU-PGA insert groups. In conclusion, despite the large amont of FU-PGA inserted, the histopathological changes in the liver, kidney and heart were slight, and consonant with the very low amount of 5-fluorouracil concentrations detected in the liver, kidney and heart. The above results suggest that the FU-PGA composite can serve as a new device for releasing drugs in a controlled manner and easily targeted to intraperitoneal organs. This device can improve the efficacy of intraperitoneal chemotherapy for gastric cancer.
백서의 복강내에 투여한 Mitomycin-C-Polyglycolic acid 제형이 장기에 미치는 영향에 관한 연구
송규상,강대영,최정목,노승무,정경수,오정연,김진향,양준목,최선웅,이진호,조준식,민병무,김용백,김창식,박근성,김승영,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
To evaluate the in-vivo effects of mitomycin-C-polyglycolic acid composite(MMC-PGA) the disk: shaped composite were implanted into the peritoneal cavity of the Sprague-Dawley rats. The pathologic changes were examined at various time points up to 12 weeks. Initially the soft tissue around the inserted disks showed capillary congestion at 3 days. Inflammatory infiltrates with foreign body giant cells appeared from the 2nd week and reached peak response at 6-8 weeks. These reaction diminished prominently at 12 weeks. No specific pathologic change was found in the liver, the kidneys, and the heart. The above results suggest that the MMC-PGA composite can serve as a new device for intraperitoneal chemotherapy of various types of cancers.