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Sub-Frame Analysis-based Object Detection for Real-Time Video Surveillance
장범석,이상현 한국인터넷방송통신학회 2019 International Journal of Internet, Broadcasting an Vol.11 No.4
We introduce a vision-based object detection method for real-time video surveillance system in low-end edge computing environments. Recently, the accuracy of object detection has been improved due to the performance of approaches based on deep learning algorithm such as Region Convolutional Neural Network(R-CNN) which has two stage for inferencing. On the other hand, one stage detection algorithms such as single-shot detection (SSD) and you only look once (YOLO) have been developed at the expense of some accuracy and can be used for real-time systems. However, high-performance hardware such as General-Purpose computing on Graphics Processing Unit(GPGPU) is required to still achieve excellent object detection performance and speed. To address hardware requirement that is burdensome to low-end edge computing environments, We propose subframe analysis method for the object detection. In specific, We divide a whole image frame into smaller ones then inference them on Convolutional Neural Network (CNN) based image detection network, which is much faster than conventional network designed for full frame image. We reduced its computational requirement significantly without losing throughput and object detection accuracy with the proposed method.
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Magnolol과 Honokiol이 항균, 교원질 분해효소, 세포독성 및 Cytokine생산에 미치는 영향
장범석,손성희,정종평,배기환 충남대학교 약학대학 의약품개발연구소 1993 藥學論文集 Vol.9 No.-
The oral microbiota such as P. gingivalis, P. intermedia and A. actinomycetemcomitans play a primary role in the initiation and progression of the periodontal disease. The purpose of this study was to evaluate the antimicrobial effects and inhibitory effects of honokiol and magnolol on the bacterial collagenase activity, cytotoxicity and cytokine production of periodontopathic microorganisms. The antimicrobial activities of honokiol and magnolol was evaluted with minimum inhibition concentration. Honokiol was more active than magnolol, but less than chlorhexidine on antimicrobial activity. The inhibitory effects of magnolol and honokiol on the collagenolytic activity and cytotoxicity were evaluated using a Collagenokit CLN-100 and rapid colorimetric assay (MTT method) for cellular growth and survival of gingival fibroblast and periodontalligament cell and [^3H]-thymidine incorporation for the gingival epithelial cell. The inhibitory effects on the collagenolytic activity was the highest in chlorhexidine, and the lowest in magnolol. Magnolol had the lowest cytotoxic effect and chlorhexidine had the highest. The inhibitory effects on cytokine production was evaluated using interleukin-1β ELISA kit (Cistron Biotech.), IL-6, TNF-α ELISA kit (Genzyme) and inhibitory effects were higher than bacterial LPS and there is no difference among the honokiol, magnolol and chlorhexidine. From these results, the antimicrobial and antienzymatic activities of honokiol and magnolol were seemed to inhibit bacterial growth and enzyme activites with lesser cytotoxic activities. Therefore, it was suggested that honokiol and magnolol are very effective antimicrobial agents on periodontal pathogens.
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장범석,엄흥식,박덕영,Chang, Beom-Seok,Um, Heung-Sik,Park, Deok-Young 대한치주과학회 1998 Journal of Periodontal & Implant Science Vol.28 No.3
The purpose of this study was to investigate the width of attached gingiva of young adults with healthy gingiva. We compared the differences according to the tooth location. The width of attached gingiva of maxilla and mandible was measured by histochemical method. The results were as follows: 1. The width of buccal keratinized gingiva in maxilla was widest in incisors(5.2-5.6mm) and narrowest in first bicuspids(4.4-4.5mm). 2. The width of buccal keratinized gingiva in mandible was widest in incisors(4.3-4.5mm) and narrowest in first bicuspids(3.2-3.3mm). 3. The width of lingual keratinized gingiva in mandible was widest in first molars(5.5-5.6mm) and narrowest in incisors(2.9-3.0mm). 4. The width of buccal attached gingiva in maxilla was widest in incisors(4.1-4.4mm) and narrowest in molars (3.0mm). 5. The width of buccal attached gingiva in mandible was widest in incisors(3.2-3.4mm) and narrowest in second molars (1.7-1.8mm). 6. The width of lingual attached gingiva in mandible was widest in first molars(3.5-3.7mm) and narrowest in incisors(1.9-2.1mm).
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장범석,박권하 한국마린엔지니어링학회 2019 한국마린엔지니어링학회지 Vol.43 No.9
Emissions regulations of the International Maritime Organization against nitrogen oxides and sulfur oxides in marine engines is intensifying. Since January 2020, the upper sulfur content limit of fuel oil used in ships subject to international navigation has been reduced to less than 0.5% from the current 3.5%. As a result, there is a high interest in post-treatment technology because it is difficult to apply high-quality oil in the short term in terms of cost. A scrubber system has been developed as a representative technology to satisfy the emission regulation; the spray characteristic of the washing water, in particular, has a very important effect on the efficiency of the apparatus. In this study, a collision spray was applied to maintain the spray characteristics suitable for the injection flow rate, which varies with the engine load fluctuation. The spray characteristics according to the flow rate fluctuation were then analyzed. From this analysis, it was determined that the diameter of the impact surface increased from 2 mm to 3 mm when the jet flow rate decreased and the optimum spray characteristics were obtained when the impact distance decreased. 박용 기관에서의 질소산화물 및 황산화물에 대한 국제해사기구의 배출규제가 강화되고 있다. 2020년 1월부터 국제항해 대상 선박에 사용되는 연료유의 황함유량 상한선 비율이 현행 3.5%에서 0.5%이하로 줄어든다. 고급유를 사용하는방법은 비용 측면에서 단기적으로 적용하기 어렵기 때문에 후처리 기술에 대한 관심이 높다. 배출규제만족을 위한 대표적인 기술로 스크러버시스템이 개발되고 있으며, 세정수의 분무특성은 장치의 효율에 매우 중요한 영향을 미친다. 본 연구에서는 엔진부하변동으로 변화되는 분사유량에 적절한 분사특성을 유지하기 위하여 충돌분무를 적용하였으며 유량변동에 따른 분무특성을 분석하였다. 분석결과 분사유량이 감소하면 충돌면의 직경은 2 mm에서 3 mm로 증가되고 충돌거리가 감소되는 경우 최적의 분무특성을 나타내었다.
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난치성 치주염환자로부터 채취한 치은연하 세균의 구성과 항생제 내성에 관한 연구
장범석,Chang, Beom-seok 대한치주과학회 2000 Journal of Periodontal & Implant Science Vol.30 No.4
It is becoming increasingly apparent that periodontitis consists of mixture of diseases, most of which respond favorably to traditional mechanical therapy. Among these variants of the disease, some appear to be associated with unusual microbial infections and defective host defenses. Many of these fail to respond to conventional treatment. The recognition that some forms of periodontitis are refractory to standard periodontal therapy has given rise to a new classification of peridontitis. A series of 1692 subgingival microbial samples sent to a diagnostic microbiology laboratory included 738 samples that could be identified as compatible with a clinical diagnosis of refractory or recurrent periodontitis. In descending order of prevalence the associated microbiota included Bacteroides forsythus(85%) ,Fusobacterium species(78%), Spirochetes(67%), Campylobacter rectus(64%), Porphyromonas gingivalis(59%), Peptostreptococcus micros(58%), motile rods(46%), Prevotella intermedia(33%), Eikenella corrodens(13%), Capnocytophaga species(12%) ,and Actinobacillus actinomycetemcomitans(6%). Antibiotic resistance to tetracycline, penicillin G, or metronidazole was particularly noticeable for Fusobacterium species, Capnocytophaga species, and Actinobacillus actinomycetemcomitans. It was largely absent for Campylobacter rectus. No antibiotic data were obtained for Porphyromonas gingivalis or Bacteroides forsythus, as these species were detected by immunofluorescence. The results indicate that a substantial number of microorganisms associated with refractory periodontitis are variably resistant to commonly-used antibiotics. Diagnostic microbiology must be considered an essential adjunct to the therapist faced with periodontal lesions refractory to conventional treatment.
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Magnolol과 Honokiol이 항균, 교원질 분해효소, 세포독성 및 Cytokine생산에 미치는 영향
장범석,손성희,정종평,배기환,Jang, Beom-Seok,Son, Seong-Heai,Chung, Chong-Pyoung,Bae, Ki-Hwan 대한치주과학회 1993 Journal of Periodontal & Implant Science Vol.23 No.1
The oral microbiota such as P. gingivalis, P. intermedia and A. actinomycetemcomitans play a primary role in the initiation and progression of the periodontal disease. The purpose of this study was to evaluate the antimicrobial effects and inhibitory effects of honokiol and magnolol on the bacterial collagenase activity, cytotoxicity and cytokine production of periodontopathic microorganisms. The antimicrobial activities of honokiol and magnolol was evaluted with minimum inhibition concentration. Honokiol was more active than magnolol, but less than chlorhexidine on antimicrobial activity. The inhibitory effects of magnolol and honokiol on the collagenolytic activity and cytotoxicity were evaluated using a Collagenokit CLN-100 and rapid colorimetric assay (MTT method) for cellular growth and survival of gingival fibroblast and periodontalligament cell and $[^3H]-thymidine$ incorporation for the gingival epithelial cell. The inhibitory effects on the collagenolytic activity was the highest in chlorhexidine, and the lowest in magnolol. Magnolol had the lowest cytotoxic effect and chlorhexidine had the highest. The inhibitory effects on cytokine production was evaluated using $interleukin-1{\beta}$ ELISA kit (Cistron Biotech.), IL-6, $TNF-{\alpha}$ ELISA kit (Genzyme) and inhibitory effects were higher than bacterial LPS and there is no difference among the honokiol, magnolol and chlorhexidine. From these results, the antimicrobial and antienzymatic activities of honokiol and magnolol were seemed to inhibit bacterial growth and enzyme activities with lesser cytotoxic activities. Therefore, it was suggested that honokiol and magnolol are very effective antimicrobial agents on periodontal pathogens.
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