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적외선 영상 기반 신경망 구조와 군집 분석을 이용한 고속 피플 카운팅
권현송 (Hyun-Song Kwon),이종화(Jong-Whoa Lee),구호근(Ho-Geun Koo),이범주(Buem-Joo Lee),김영국(Young-Kuk Kim) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
"People Counting" is one of the main research areas of object detection and counting algorithms. This algorithm uses various electronic sensors or image cameras to automatically count the number of people passing by. In this paper, high—speed people counting algorithm using neural network structure in infrared video is proposed. The advantage of this method is that it is fast and can also be trained with classification data which is easy to build dataset. The proposed algorithm is performed in the order of detecting pedestrians using neural network and cluster analysis. After that it analyzes the movements of the detected pedestrians and counting the number of in—out people. Furthermore, the corresponding algorithm showed 3.03 times faster processing speed than the YOLOv3—tiny model which is specialized in high—speed operation of object detection.
CoCl₂ 처리로 유도된 hypoxia상태에서 세포자살과 ER stress에 관련된 인자의 발현
Seon-Hwan Kim(김선환),Hyon-Jo Kwon(권현조),Hyeon Song Koh(고현송),Shi-Hun Song(송시헌),Kisang Kwon(권기상),O-Yu Kwon(권오유),Seung Won Choi(최승원) 한국생명과학회 2010 생명과학회지 Vol.20 No.12
PC12 세포에서 CoCl₂에 의한 hypoxia 유도는 HIF1 alpha의 상승 발현으로 확인하였다. 이때 apoptosis의 유도는 genomic DNA의 fragmentation과 apoptotic body는 Hoechst 염색으로 확인되었고, ER luminal chaperone의 발현 및 ER stress signal에 관여하는 ER membrane kinase인 IRE1, PERK, ATF6의 발현도 확인되었다. 이들이 apoptosis로 연결되는 고리 역할을 하는 IRE1-XBP1 mRNA splicing, PERK-eIF2 alpha, ATF6 protein cleavage도 반응하는 것으로 확인되었다. 위의 결과는 신경세포의 hypoxia상태는 ER stress signal pathway를 거쳐서 apoptosis가 된다는 것을 증명한 것으로 신경세포의 hypoxia치료를 위한 기초 자료가 될 것으로 생각한다. Cobalt(Ⅱ) chloride, a chemical compound with the formula CoCl₂, has been widely used in the treatment of anemia, as a chemical agent for the induction of hypoxia in cell cultures, and is known to activate hypoxic signaling. However, excessive exposure to cobalt is associated with several clinical conditions, including asthma, pneumonia, and hematological abnormalities, and can lead to tissue and cellular toxicity. It is also known to induce apoptosis. One of the questions was that of whether CoCl₂ might induce apoptosis via endoplasmic reticulum (ER) stress in neurons. To address this question, first, the level of DNA fragmentation was measured for assay of apoptotic rates using CoCl₂ with neuron PC12 cells. After confirmation of apoptosis inductions, under the same conditions, the expression levels of ER stress associated factors [ER chaperones Bip, calnexin, ERp72, ERp29, PDI, and ER membrane kinases (IRE1, ATF6, PERK)] were examined by RT-PCR and Western blotting. These results indicated that apoptosis is induced through activation of ER membrane kinases via ER stress. In conclusion, during induction of apoptosis through CoCl₂-induced hypoxia in neuron PC12 cells, ER membrane kinase of IRE1 was dominantly up-expressed, and, consecutively, TRAF2, which has been suggested to be one of the links connecting apoptosis and ER stress, was strongly up-expressed.
빌딩 출입 인원 실시간 모니터링을 위한 CCTV 고속 분석 알고리즘
채승언(Chae, Seung-Un),권현송(Kwon, Hyun-Song),박성룡(Park, Sung-Ryong),조완호(Cho, Wan-Ho),권오성(Kwon, Oh-Sung),이재승(Lee, Jae-Sung) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.2
화재 등 재난 상황에서 피난을 돕는 가장 중요한 정보는 빌딩 내 재실자의 인원 파악과 이동 상황이다. 이를 위하여 출입구에 CCTV를 설치하는 경우에도 육안 모니터링에 의존할 수 밖에 없다. 본 논문은 CCTV에서 수집된 비디오 프레임 이미지로부터 실시간으로 출입 인원 정보를 자동으로 검출하는 시스템을 설명하고 디지털 영상 분석 분야에서 흔히 사용하는 특징 영역 정합 방식을 개선하여 인식률 저하없이 보다 고속으로 분석하는 방안을 제안하였다. 제안하는 방식은 피라미드형 계층 영역 구조를 기반으로 하는 데 최상위 레이어의 해상도가 최하위 레이어 보다 1/16로 압축되도록 설계하였다. 이러한 계층 구조에서 최상위 레이어는 추가적인 분석을 진행할 것인지를 결절하는 트리거 역할을 주로 담당하고, 필요에 따라 하위 레벨의 분석을 진행하는 구조이다. 또한, 상위 레벨의 트리거된 영역과 관계된 부위만을 하위 레벨 레이어에서 처리되도록 하여 전채적인 CPU 소모 시간을 줄였다. 실험 결과, 전체 과정 중에서 특징 추출 단계 시 CPU 요구 시간이 기존 단일 레이어 구조 방식의 13.96% 수준으로 제안하는 방식이 실행 가능함을 확인하였고, 전체 처리 시간 역시도 69.92% 수준으로 단축할 수 있었다. The most important information required to help people escape from disasters such as fires is knowing the number of people that are trapped in the building and their mobility situation. For this purpose, CCTV can be installed and used at entrances, but they do not need to rely on visual monitoring. This paper describes the system of automatically detecting access personnel information from video frame images collected from the CCTV in real time. We propose to improve the region growing method commonly used in the digital image processing field without the degradation of the recognition rate. The proposed method is based on a pyramid-type hierarchical area structure, and is designed to compress the resolution of the top layer to 1/16 of the bottom layer. In this hierarchical structure, the top layer is a casting that primarily serves as a trigger to decide whether to proceed with further analysis and, if necessary, a lower level analysis. In addition, CPU consumption time was reduced by ensuring that only areas related to the high-level triggered areas are processed at the lower-level layers. As a result of the experiment, the proposed layer area analysis method was able to reduce the execution time to 13.96% and the overall processing time to 69.92% over the existing one-layer analysis method.
후두개와 수술 후 경막 하 콜라겐 매트릭스 이식술의 뇌척수액 유출 방지에 대한 효용성
정은오(Eun-Oh Jeong),김선환(Seon-Hwan Kim),임정욱(Jeong-Wook Lim) 권현조(Hyon-Jo Kwon),최승원(Seung-Won Choi),고현송(Hyeon-Song Koh),염진영(Jin-Young Youm),송시헌(Shi-Hun Song) 대한두개저학회 2016 대한두개저학회지 Vol.11 No.2
Objective : Complete protection from CSF(cerebrospinal fluid) leakage after posterior fossa surgerywas difficult, although many variable methods has been performed. Collagen matrix is product toprotect dura defect and prevent CSF leakage. The authors performed collagen matrix underlay graftand identified effectiveness of this technique for CSF sealing.Methods : The authors evaluated 92 posterior fossa surgery used fibrin glue, polyethylene glycol(PEG) sealant, fibrinogen based collagen fleece, collagen matrix between January 2006 andDecember 2015. CSF leakage incidence according to use of variable dura sealing materials wasassessed.Results : CSF leakage occurred 8 cases(8.7%) in 92 posterior fossa surgery. CSF leakage didn’toccur in 42 cases underwent collagen matrix underlay graft. Cases of fibrin glue, polyethyleneglycol(PEG) sealant, fibrinogen based collagen fleece had effect of CSF leakage block, howeverdidn’t have significant difference according to use of this materials.Conclusion : Collagen matrix underlay graft after posterior fossa surgery didn’t have complicationsuch as chemical injury and infection and had effect of CSF sealing.