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정근용,오용설,민성준,오경석,허훈 한국항공우주학회 2004 한국항공우주학회 학술발표회 논문집 Vol.- No.-
A methodology to identify random disturbance implied on flexible dynamic system is proposed. Correlation characteristics of external random disturbance sources on the system are characterized and analyzed to figure out it. Also the study to utilize the developed technique for the control of flexible system is mentioned.
스테레오 영상 보행자 인식 시스템의 후보 영역 검출을 위한 GP-GPU 기반의 효율적 구현
정근용,정준희,이희철,전광길,조중휘,Jeong, Geun-Yong,Jeong, Jun-Hee,Lee, Hee-Chul,Jeon, Gwang-Gil,Cho, Joong-Hwee 대한임베디드공학회 2013 대한임베디드공학회논문지 Vol.8 No.2
There have been various research efforts for pedestrian recognition in embedded imaging systems. However, many suffer from their heavy computational complexities. SVM classification method has been widely used for pedestrian recognition. The reduction of candidate region is crucial for low-complexity scheme. In this paper, We propose a real time HOG based pedestrian detection system on GPU which images are captured by a pair of cameras. To speed up humans on road detection, the proposed method reduces a number of detection windows with disparity-search and near-search algorithm and uses the GPU and the NVIDIA CUDA framework. This method can be achieved speedups of 20% or more compared to the recent GPU implementations. The effectiveness of our algorithm is demonstrated in terms of the processing time and the detection performance.
증례 : 혈액종양 ; 한국 남성 노인에서 발견된 췌장 고형 가유두상 종양의 증례
정근용 ( Geun Yong Jung ),윤태욱 ( Tae Wook Yoon ),박영준 ( Young Jun Park ),최준영 ( Jun Young Choi ),정지환 ( Jee Hwan Jung ),임태규 ( Tae Kyu Lim ) 대한내과학회 2015 대한내과학회지 Vol.89 No.5
Solid pseudopapillary tumor (SPT) of the pancreas is a rare tumor that typically affects young women without causing significant clinical symptoms. No case of SPT in an old man has been reported in South Korea, and such cases are very rare worldwide. We report a 70-year-old man with SPT of the pancreas with multiple organ metastasis. Although surgical resection is the treatment of choice for SPT, we decided not to treat, considering his age and the disease severity. (Korean J Med 2015,89:589-592)
정근용 ( Geun-yong Jeong ),강현수 ( Hyun-su Kang ),김찬성 ( Chan-sung Kim ),이상진 ( Sang-jin Lee ),이영섭 ( Young-sup Lee ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
본 논문은 영상처리 및 센서를 이용하여 주유할 차량으로 이동, 주유구 인식 및 개폐, 주유까지의 과정을 처리할 수 있는 무인 주유 로봇의 구현 과정을 기술하였다. 캐터펄트는 자동차가 주차된 곳에 정확히 멈추게 되고, 로봇 팔이 영상 처리를 이용하여 주유구 위치를 찾아낸 뒤 주유를 시작한다. 로봇은 현 주유 시스템의 불편한 점을 사람 없이 전 과정을 처리하는 역할을 함으로써 주유소를 무인화하여 인건비를 최소화 시키고, 악천후 상황에서 주유의 편리성을 기대할 수 있다.
Endoscopic Removal of Remained Drawstring After Percutaneous Transhepatic Biliary Drainage
윤태욱,정근용,박영준,최준영,김태균 고신대학교(의대) 고신대학교 의과대학 학술지 2016 고신대학교 의과대학 학술지 Vol.31 No.2
The percutaneous transhepatic biliary drainage (PTBD) is an effective intervention as a palliative therapy for relieving a jaundice and cholangitis. It may be used in place of Endoscopic retrograde cholangiopancreatography (ERCP) in the obstructive biliary disease. Recently, by developing invasive procedures, the incidence of the complications such as bleeding and perforation has been increasing in the diagnosis and treatment of hepatobiliary disease. We report here on a case of remained drawstring after PTBD in a 85-year-old man. The patient was conducted PTBD for relieving a jaundice and cholangitis. And then the patient had complained of abdominal pain constantly. A few days later, we removed PTBD and attempted ERCP for removal of CBD stone. The ERCP showed remained drawstring around ampulla of vater and we removed it by IT knife. The drawstring was successfully removed.
박민웅,정근용,조중휘 대한임베디드공학회 2014 대한임베디드공학회논문지 Vol.9 No.6
This paper presents pedestrian recognition to improve performance for vehicle safety system or surveillance system. Pedestrian detection method using HOG (Histograms of Oriented Gradients) has showed 90% recognition rate. But if someone takes a picture in the rain, the image may be distorted by rain streaks and recognition rate goes down by 62%. To solve this problem, we applied image decomposition method using MCA (Morphological Component Analysis). In this case, rain removal method improves recognition rate from 62% to 70%. However, it is difficult to apply conventional image decomposition method using MCA on vehicle safety system or surveillance system as conventional method is too slow for real-time system. To alleviate this issue, we propose a rain removal method by using low-pass filter and DCT (Discrete Cosine Transform). The DCT helps separate the image into rain components. The image is removed rain components by Butterworth filtering. Experimental results show that our method achieved 90% of recognition rate. In addition, the proposed method had accelerated processing time to 17.8ms which is acceptable for real-time system.
Extranodal Marginal Zone B-Cell Lymphoma of Mucosa-Associated Tissue Type Involving the Dura
최준영,정지환,박영준,정근용,윤태욱,김윤정,임태규,김봉석,남승현 대한암학회 2016 Cancer Research and Treatment Vol.48 No.2
Primary central nervous system marginal zone B-cell lymphoma (MZBCL) is very rare, with only a few reported cases worldwide. It has an indolent disease course with high cure potential. We experienced a rare case of dural MZBCL of mucosa-associated lymphoid tissue (MALT) in a 69-year-old man who presented with headache. A magnetic resonance imaging scan of brain showed a 1.9!3.6-cm-sized extra-axial mass with a broad based dural attachment to the anterosuperior aspect of the falx cerebri, radiographically consistent with meningioma. Surgical resection yielded a MZBCL of the MALT type. Histopathology revealed a lymphoplasmacytic infiltration of the dura, and immunohistochemical study showed a B-cell phenotype with CD20, bcl-2, MUM- 1, Ki-67 positive. He was treated with chemotherapy after complete surgical resection and remained free of disease at 30 months after chemotherapy. MALT lymphoma must be considered in the differential diagnosis in patients presenting radiographically with meningioma.