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김재열(Jae-Yeul Kim),하종은(Jong-Eun Ha) 제어로봇시스템학회 2020 제어·로봇·시스템학회 논문지 Vol.26 No.11
In visual surveillance, the robust detection of foreground objects under diverse environmental changes is the main goal. In the case of traditional algorithms, they usually obtain a background model image through the statistical analysis, which is used for finding foreground objects by comparing with a current image. Recently, many deep learning-based visual surveillance algorithms have been proposed, and they show improved performance than traditional algorithms. However, they usually show a good performance when test images are similar to training environments. Retraining is required to have an improved result in scenes which are different from training environments. In this paper, we aim to have an improved deep learning-based visual surveillance algorithm which also an improvement in new scenes. We use two types of images as the input of the U-Net, which produces a foreground segmentation map as output. A background model image which is generated by VAE is used one type of input. The other type of input to the network is multiple original images. Also, we train the presented network using multiple scenes while most conventional deep learning-based visual surveillance algorithms newly train a network per scene. Experimental results using various open datasets show the feasibility of the presented algorithm.
발사체 공학교육을 위한 물로켓, Part I: 원리와 시스템 구성
김재열(Jae-Yeul Kim),황원섭(Won-Sub Hwang),최정열(Jeong-Yeol Choi) 한국항공우주학회 2019 韓國航空宇宙學會誌 Vol.47 No.7
물로켓은 우주발사체와 동일한 기본원리를 가지는 가압식 액체추진제 로켓이다. 물로켓은 청소년용 과학교육 교보재 수준을 훨씬 넘어, 대학 수준의 액체 로켓 및 발사체 체계 공학 교육의 도구로 활용될 수 있다. 본 논문에서는 물로켓의 추진 및 비행 원리와 이론을 대학 학부의 로켓 공학 교육 수준에서 고찰하였다. 아울러 발사체와 발사대, 탑재체, 회수 및 고도 장치와 방법 등 체계 수준의 물로켓 설계와 운영에 대한 사항들을 정리하였다. Water rocket is a pressurized liquid propellant rocket that shares the same basic principles of space launch vehicles. Water rockets can be used as an engineering educational material for the liquid rocket principles and the launch vehicle systems, far beyond the scope of K-12 level science education. In this paper, the principles and theories of water rocket propulsion and flight dynamics was investigated at the level of undergraduate rocket engineering classes. Also, the system level design and operation of water rocket is summarized by including the components of launch vehicle, launch pad, payload and recovery as well as altitude measurement methods.
발사체 공학교육을 위한 물로켓, Part Ⅱ: 발달사, 제작사례 및 경연대회
김재열(Jae-Yeul Kim),황원섭(Won-Sub Hwang),정승민(Seung-Min Jung),최정열(Jeong-Yeol Choi) 한국항공우주학회 2019 韓國航空宇宙學會誌 Vol.47 No.11
물로켓은 가압된 기체와 액체(물)를 추진제로 이용하는 비화학식 로켓이다. 물로켓은 우주발사체로 사용되는 액체 추진제 로켓과 많은 공학적 공통점을 가지므로 로켓 공학 모델로써의 교구로 활용할 가치가 충분하다. 이를 위하여 본 논문에서는 물로켓의 발달사를 간략히 살펴보고 청소년용 물로켓, 상용 물로켓, 동호인들의 물로켓을 살펴봄으로써, 공학 교구로써 물로켓의 활용 가능성을 살펴보았다. 마지막으로 현행 물로켓 경연대회들의 한계를 살펴봄으로써, 물로켓에 대한 인식의 변화를 유도할 경연 방식의 개선방향을 제시한다. Water rocket is a non-chemical rocket mechanically powered by pressurized gas and liquid (water) propellants. Since water rockets share many engineering commonalities with liquid propellant rockets for space launch vehicles, it is worth as a education tool for rocket engineering. Present paper investigated the availability of water rocket as an engineering education model by surveying the history of water rocket and making examples from K-12 education, commercial products and club activities. Finally, a way of improvement is suggested for water rocket competitions make changes in the perception on water rockets by examining the limitations of present competitions.
반복적인 호흡기 감염과 천식 악화가 동반된 IgG3 아형 결핍증 성인 환자에서 intravenous immunoglobulin 사용 1예
이홍열 ( Hong Yeul Lee ),윤상원 ( Sang Won Yoon ),김영 ( Young Kim ),조환준 ( Hwan Jun Cho ),이주영 ( Joo Young Lee ),구강모 ( Kang Mo Gu ),박태연 ( Tae Yun Park ),최재철 ( Jae Chol Choi ),신종욱 ( Jong Wook Shin ),김재열 ( Jae Y 대한천식알레르기학회 2016 Allergy Asthma & Respiratory Disease Vol.4 No.3
The IgG subclass deficiency is defined as a significant decrease in the serum concentrations of one or more subclasses of IgG in a patient whose total IgG concentration is normal. IgG subclass deficiency can predispose to recurrent sinopulmonary infections. A 29-year-old female patient with a 4-year history of bronchial asthma presented with cough, sputum, dyspnea, and recurrent respiratory infections. She had frequently been treated with antibiotics and systemic steroids for recurrent respiratory infections and acute asthma exacerbations. Chest X-ray and computed tomography showed pectus excavatum and bronchial wall thickening without lung parenchymal abnormalities. On immunological evaluation, she was found to have a low serum IgG3, with normal total IgG concentration. Under diagnosis of selective IgG3 deficiency, she was started on monthly infusions of intravenous immunoglobulin (IVIG) therapy. The frequency and severity of respiratory infections and acute asthma exacerbations were markedly decreased during 3 years of IVIG therapy. Our case report suggests that a patient who has underlying selective IgG3 deficiency and asthma may benefit from IVIG therapy as this can significantly reduce the incidence and severity of recurrent respiratory infections and acute asthma exacerbations. (Allergy Asthma Respir Dis 2016;4:225-229)
정승민(Seung-Min Jeong),김재열(Jae-Yeul Kim),오종수(Jong-Su Oh),최정열(Jeong-Yeol Choi) 한국항공우주학회 2024 韓國航空宇宙學會誌 Vol.52 No.7
물로켓은 추진제 배출에 따라 내부 압력이 감소하는 비정상 유동과 연수에 의한 열발생이 없다는 점을 제외하고 액체로켓과 동일한 원리로 작동한다. 선행된 물로켓 비정상 추진 이론 모델은 비정상 비압축성 액체추진 및 비정상 압축성 기체추진 구간으로 나뉘어 정립되었다. 본 논문에서 다양한 추진제량 및 공기압 조건으로 다수의 시험을 수행하여 이론 결과와 비교하였다. 비정상 추진 이론이 지상 실험 결과를 잘 예측함에도 불구하고 비행 시험 결과는 이론 예측 고도를 초과하는 결과를 보여주었다. 시험 결과가 이론 값을 초과하는 이유는 이는 압력용기에 축척된 변형 에너지가 추진성능에 추가적인 영향을 미치는 것으로 추론된다. The water rocket operates is in same principle with the liquid rocket, except for the absence of combustion heating and unsteady flow dynamics from the pressure decrease by the propellant exhaust. The preceding model for the unsteady propulsion of water rockets was established by dividing it into unsteady incompressible liquid propulsion and unsteady compressible gas-phase propulsion. In this paper, a number of experiments were conducted under different propellant quantities and air pressure conditions, comparing them with theoretical results. Despite the unsteady propulsion theory accurately predicting ground test results, flight tests exhibit altitude higher than the theoretical estimation. This discrepancy is inferred to be due to the additional impact of accumulated deformation energy in the pressure vessel affecting propulsion performance.
박용성,이종웅,정희동,김재열,황선광,Park, Young-Sung,Lee, Jong-Woong,Jung, Hee-Dong,Kim, Jae-Yeul,Hwang, Sun-Gwang 대한디지털의료영상학회 2007 대한디지털의료영상학회논문지 Vol.9 No.2
In angiography, the global standard agreements of DICOM is lossless. But it brings on overload and takes too much store space in DICOM sever. Because of all those things we transmit images which is classified in subjective way. But this cause data loss and would be lead doctors to make wrong reading. As a result of that we try to transmit continued image (raw data) to reduce those mistakes. We got angiography images from the equipment(Allura FD20-Philips). And compressed it in two different methods(lossless & lossy fair). and then transmitted them to PACS system. We compared the quality of QC phantom images that are compressed by different compress method and compared spatial resolution of each images after CD copy. Then compared each Image's data volume(lossless & lossy fair). We measured spatial resolution of each image. All of them had indicated 401p/mm. We measured spatial resolution of each image after CD copy. We got also same conclusion (401p/mm). The volume of continued image (raw data) was 127.8MB(360.5 sheets on average) compressed in lossless and 29.5MB(360.5 sheets) compressed in lossy fair. In case of classified image, it was 47.35MB(133.7 sheets) in lossless and 4.5MB(133.7 sheets) in lossy fair. In case of angiography the diagnosis is based on continued image(raw data). But we transmit classified image. Because transmitting continued image causes some problems in PACS system especially transmission and store field. We transmit classified image compressed in lossless But it is subjective and would be different depend on radiologist. therefore it would make doctors do wrong reading when patients transfer another hospital. So we suggest that transmit continued image(raw data) compressed in lossy fair. It reduces about 60% of data volume compared with classified image. And the image quality is same after CD copy.
성인 만성 부비동염에서 내시경적 부비동 수술 전·후의 증상 호전도와 음향비강통기도 검사 결과
김용대,김재열,장근영,이형중,송시연,윤석근 영남대학교 의과대학 2002 Yeungnam University Journal of Medicine Vol.19 No.1
Background: Chronic paranasal sinusitis is one of the most common disease in the otorhinolaryngologic field. Endoscopic sinus surgery is treatment of choice in chronic paranasal sinusitis. The aim of this study was to evaluate objective and subjective treatment outcomes of endoscopic sinus surgery in adult chronic paransal sinusitis with or without polyp. Materials and Methods: We reviewed 84 adult patients underwent endoscopic sinus surgery by one surgeon from June 1999 to June 2000, prospectively. We analyzed preoperative and postoperative subjective symptom scores and acoustic rhinometric results. Results: Fifty cases were male and thirty four cases female. The average age was of 33 year-old (range: 17 to 66 years). There was significantly improvement of symptom scores in postoperative 3 months and 6 months compared with preoperative symptom scores. There was significantly increased postoperative total volume of nasal cavity. When we compared high score group with low score group, there was statistically significant improvement of symptom scores between preoperative stage and postoperative 3 months in radiologic grading group. Conclusion: Endoscopic sinus surgery is considered to be effective for the treatment of chronic paranasal sinusitis. It seems to be helpful to employ subjective symptom score system and objective total volume change of nasal cavity through acoustic rhinometric test to analyze effectiveness of endoscopic sinus surgery. In this study, the most important preoperative factor of sinus surgery outcomes is radiologic grading system.