Alkalophilic Bacillus sp . YJ - 451 이 생산하는 Bacteriolytic Enzyme 을 이용한 식품 저장에 관한 연구

옥승호,정명호,배동훈,공인수,유주현 한국미생물생명공학회 1993 한국미생물생명공학회 학술발표초록집 Vol.1993 No.1

선호도 기반 최단경로 탐색을 위한 휴리스틱 융합 알고리즘

옥승호(Seung-Ho Ok),안진호(Jin-Ho Ahn),강성호(Sungho Kang),문병인(Byungin Moon) 大韓電子工學會 2010 전자공학회논문지TC (Telecommunications) Vol.47 No.8

본 논문에서는 개미 군집 최적화 (Ant Colony Optimization; ACO) 및 A* 휴리스틱 알고리즘이 융합된 선호도 기반 경로탐색 알고리즘을 제안한다. 최근 ITS (Intelligent Transportation Systems)의 개발과 함께 차량용 내비게이션의 사용이 증가하면서 경로탐색 알고리즘의 중요성이 더욱 높아지고 있다. 기존의 Dijkstra 및 A*와 같은 대부분의 최단경로 탐색 알고리즘은 최단거리 또는 최단시간 경로 탐색을 목표로 한다. 하지만 이러한 경로 탐색 결과는 더 안전하고 특정 경로를 선호하는 운전자를 위한 최적의 경로가 아니다. 따라서 본 논문에서는 선호도 기반 최단 경로 탐색 알고리즘을 제안한다. 제안된 알고리즘은 주어진 맵의 링크 속성 정보를 이용하며, 각 링크에 대한 사용자 선호도는 내비게이션 사용자에 의해 설정되어 진다. 제안된 알고리즘은 C로 구현하였으며, 64노드 및 118링크로 구성된 맵에서 다양한 파라미터를 통해 성능을 측정한 결과 본 논문에서 제안한 휴리스틱 융합 알고리즘은 선호도 기반 경로뿐만 아니라 최단 경로 탐색에도 적합함을 알 수 있었다. In this paper, we propose a preference-based shortest path algorithm which is combined with Ant Colony Optimization (ACO) and A* heuristic algorithm. In recent years, with the development of ITS (Intelligent Transportation Systems), there has been a resurgence of interest in a shortest path search algorithm for use in car navigation systems. Most of the shortest path search algorithms such as Dijkstra and A* aim at finding the distance or time shortest paths. However, the shortest path is not always an optimum path for the drivers who prefer choosing a less short, but more reliable or flexible path. For this reason, we propose a preference-based shortest path search algorithm which uses the properties of the links of the map. The preferences of the links are specified by the user of the car navigation system. The proposed algorithm was implemented in C and experiments were performed upon the map that includes 64 nodes with 118 links. The experimental results show that the proposed algorithm is suitable to find preference-based shortest paths as well as distance shortest paths.

고속 스테레오 정합을 위한 점진적 시차 탐색 범위 추정 기법

옥승호(Seung-Ho Ok),문병인(Byungin Moon) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.1

In this paper, to reduce the computational overhead of the conventional area-based stereo matching algorithm, we propose a progressive disparity search range estimation method for a high-speed stereo matching algorithm. The proposed method can increase the matching accuracy by avoiding the matching on unnecessary areas and decrease the computational overhead by using the proposed disparity search range estimation method that uses the previously obtained depth map. The experimental results showed that the average matching accuracy was increased by 10% and the average computation overhead was reduced by 62% compared with the previously proposed stereo matching algorithms. This is because the disparity search range was decreased by 81% so that the proposed algorithm can avoid unnecessary matching areas.

하지 64 MDCT 혈관조영술에서 outrun 예방을 위한 검사방법

안병환(Byoung Hwan Ahn), 옥승호(Seung Ho Ock), 김순자(Soon Za Kim), 권대철(Dae Cheol Kweon), 권오성(Eun Kyoung Lee), 이은경(Oh Seong Kweon), 임흥선(Heung Seon Im), 김명구(Myeong Goo Kim) 대한CT영상기술학회 2007 대한CT영상기술학회지 Vol.9 No.1

Purpose In present, MDCT has come into wide use. But outrun often occurs due to fast scanning and rotation time in lower extremity CT angiography with-64 MDCT. We studied the prevention to outrun in lower extremity CT angiography. Materials and Methods Between October 2006 and January 2007, during a period of 4 months, total 210 patients underwent a lower extremity CT angiography with 64 channel MDCT. We scanned patients from the level of lumber-spine three to feet in a single helical scan with 64 MDCT. Examination was scanned by each of different scanning methods. We changed the scan parameter in 3 ways. First, we set the delay time to 6.4 sec and the rotation time to 1sec. We called it to PG 1 (aorta slow). Second, we set the delay time to 20 sec and the rotation time to 0.4 sec. We called it PG 2 (aorta fast). Third method was same as PG 1 except of setting triggering level to popliteal artery. It was called for PG 3 (popliteal fast). The data from scanning was transmitted to 3D software program. Three-dimensional images were obtained using MIP(maximum intensity projection). Four radiologist evaluated all the results in reference to outrun, vein contamination, motion artifact and enhancement of vessel. Results In PG 1, there was no outrun. But it had some vein contamination and motion artifact because of long scan time. In PG 2, there was some outrun. But it had hardly vein contamination and motion artifact due to fast scan time. In PG 3, there was no outrun, too On the a:her hand, it had some vein contamination. Conclusion The best way to prevent outrun is program one (PG 1) or program three (PG 3) in lower extremity CT angiography with 64 MDCT. But each method has inherently a merit and demerit. We should use the protocol which is fit to patient history.

Dual Source CT에서 Coronary검사의 방사선량 비교분석

신용환(Yong Hwan Shin), 안병환(Byoung Hwan Ahn), 옥승호(Seung Ho Ock), 권오성(Oh Sung Kwon), 임흥선(Heung Seon IM), 김명구(Myeong Goo Kim) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1

Purpose This Paper compared the Radiation Dose of Dual Source ECG-gating Spiral Scan and ECG-triggered Sequential Scan in coronary CT. and Analysed how much the Radiation dose reduced in sequential scan. Materials and Methods We studied Spiral and Sequential scan in Phantoms and used by Dual source MDCT called Definition. Scan was made as follows;(Spiral scan:Kvp/mAs/Rotation time/Pitch/Scan time/=100/320/0.33/0.28/8.82, Sequential scan: Kvp/mAs/Table feed/Cycle time/Scan time =100/180/20/1.37/8.22). We used ECG Simulator as equipment( NETECH) Contrast media diluted (CM :1, Normal saline:24) An Experimental method compared CIDivol and CIDIDlP with Spiral and Sequential scan and were measured. Qualitive analysis evaluate the CTDIvol, and CTDIDLP, and SNR through ROI analysis. Quantitative analysis evaluate the Uniformity and noise, Preference Results The results obtained as follows; Radiation dose reduced about 28.8% in Sequential scan than Spiral scan. SNR increased in Spiral scan than Sequential scan. The image Qualities with Sequential scan showed better than Spiral scan. Conclusion In conclusion, by comparing the Phantoms image with Spiral scan and Sequential Radiation dose reduced in Sequential scan. If used and selected properly Sequential scan useful clinically applied to the patients with coronary Disease. (Heart Rate <60-65bpm)

Lactic Acid Fermentation with Rice Koji as a Carbon Source

박석균,옥승호,김진만 한국생물공학회 2015 KSBB Journal Vol.30 No.1

Recently, several health benefits of rice wine,makgeolli, was known due to the interest on the traditionalKorean liquor and the researches on the rice wine are increasing. Organic acids produced during the process of rice winefermentation play important roles in the taste and flavor. Inthis study, we have examined the optimal conditions for lacticacid production in rice koji as a carbon source. Skim milkwas also used as a supplementary ingredient for the optimizationof lactic acid fermentation. Bacterial growth of Lactobacillussakei was monitored with this condition. The pH,acidity of the culture and the ethanol tolerance of this bacteriumwere also tested. Through these experiments, we wereable to optimize the growth condition of lactic acid bacteriaby the addition of skim milk. This was also able to affect thechange of pH, acidity, sugar concentration and alcohol tolerance,which might contribute to the improvement of the qualityof rice wine. The optimal condition for the growth was 2days with 10% (w/v) of skim milk concentration. With theseresults, it was confirmed that rice koji was an effective carbonsource for the growth of lactic acid bacteria.

딥러닝 기반 선박 검출 및 AIS를 활용한 선박 충돌 경보 기법

김현빈,옥승호 한국정보기술학회 2023 한국정보기술학회논문지 Vol.21 No.11

본 논문에서는 육상에 설치된 CCTV 영상에서 바지선을 딥러닝 기반으로 검출 후 위치를 추정하고, AIS(Automatic Identification System)로 수집된 위치 정보를 활용하여 선박 충돌 경보 시스템을 제안한다. 이를 위해 YOLOv5를 기반으로 선박을 추론 및 검출하고, IoU 데이터를 사용하여 선박과의 충돌 예측을 위한 위·경도 좌표 변환을 수행하였다. 이후 추정된 좌표를 통해 DCPA(Distance of Closet Point of Approach) 및 TCPA(Time of CPA)를 적용하여 선박 충돌 예상 시간과 근접 거리를 산출함으로써 충돌 가능성을 도출하였다. 본 논문에서 제안하는 기법은 바지선을 검출하고 항만 내 충돌 사고를 예방하는 해상 감시 시스템에 활용될 수 있을 것으로 기대한다. In this paper, we propose a vessel collision warning system by detecting and estimating the location of barges based on deep learning from CCTV images installed on land and using location information collected by AIS (Automatic Identification System). Accordingly, the vessel was detected and inferred based on YOLOv5, and collision with another vessel was predicted using the latitude and longitude coordinate transformation technique using IoU (Intersection over Union) data. Afterward, DCPA(Distance of Closest Point of Approach) and TCPA(Time of CPA) were applied through the estimated coordinates to calculate the estimated time and proximity distance of the ship collision, thereby deriving the possibility of collision. It is expected that the technique proposed in this paper can be used in a maritime surveillance system that detects barges and prevents collision accidents in ports.

Metarrhizium anisopliae(Metschn.) Sorok이 생산하는 Biopolymer YU-122의 생산과 그 특성

최용석,옥승호,유주현,배동현 한국산업미생물학회 1997 한국미생물·생명공학회지 Vol.25 No.1

토양으로부터 분리한 Metarrhizium anisopliae (Metschn.) Sorok이 생산하는 biopolymer를 정제하여 분석하고, 그의 생산조건을 검토하였다. 탄소원으로 mannitol, 질소원으로는 polypepton을 사용했을 때 가장 많은 biopolymer를 생산하였고 K_2HPO_4 및 CaCl_2를 첨가함으로서 생산량이 더욱 증가하였다. 또한 이 biopolymer를 정제하여 그 분자량과 구성성분을 검토한 결과 Metarrhizium anisopliae(Metschn.) Sorok이 생산하는 Biopolymer YU-122는 분자량이 1.7×10 exp (6)이고, C, H의 구성비가 1:2이며 미량의 N이 검출되었으나, 주 구성성분은 glucose와 galactose의 환원당으로 이루어져있는 전혀 새로운 biopolymer인 것으로 나타났다. To produce biopolymer, Metarrhizium anisopliae (Metschn.) Sorok was cultured in a medium containing glucose 1.0%, sucrose 2.0%, soluble starch 1.0%, yeast extract 0.5%, polypeptone 0.5%, K_2HPO_4 0.1%, MgSO_4·7H_2O 0.02%. The culture broth was centrifuged and the polymer was harvested by adding methanol to the culture supernatant. When three times of methanol was added, the polymer was coagulated and precipitated. Then it was further purifued through successive SK-1B, SA-20P, HP-20 column chromatographies. This polymer was designated as Biopolymer YU-122. C:H ratio of this Biopolymer YU-122 was 1:2 and small amount of N is detected by CHN analyzer. Glucose and galactose are main components of this polymer. Average molecular weight of this biopolymer was 1.7×10 exp (6) by Sepharose 4B gel permeation chromatography. Optimal condition for biopolymer production was investigated. When 5% of mannitol was used as a carbon source, and polypepton as a N source, highest productivity of biopolymer was achieved. C/N ratio as nutrient was also a major factor in polymer production and its optimal ratio was 3.

전고가 높은 차량을 위한 통과 높이 경고 시스템

김태원,옥승호,허경용,이임건,Kim, Tae-Won,Ok, Seung-Ho,Heo, Gyeongyong,Lee, Imgeun 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.7

Recently, as the number of high-height vehicles such as double-decker buses has increased, collision accidents have occurred in bridges and tunnels due to the deviation from the designated routes and driver's carelessness. In the case of the existing front collision warning system, it is limited to vehicles and pedestrians, so it is difficult to use it as a pass height warning system for the high height vehicles. In this paper, we propose a system that generates a warning by determining the correlation and time series characteristics of data for each segment using multiple lidar sensors and then determining the possibility of collision in the upper part of the vehicle. Also, the proposed system confirmed the proper operation through a real-time driving test and a system performance evaluation by the Korea Automobile Testing & Research Institute.

Lactic Acid Fermentation with Rice Koji as a Carbon Source

박석균,옥승호,김진만,Park, Suk-Gyun,Ohk, Seung-Ho,Kim, Jin-Man The Korean Society for Biotechnology and Bioengine 2015 KSBB Journal Vol.4 No.2

Recently, several health benefits of rice wine, makgeolli, were known due to the interest on the traditional Korean liquor and the researches on the rice wine are increasing. Organic acids produced during the process of rice wine fermentation play important roles in the taste and flavor. In this study, we have examined the optimal conditions for lactic acid production in rice koji as a carbon source. Skim milk was also used as a supplementary ingredient for the optimization of lactic acid fermentation. Bacterial growth of Lactobacillus sakei was monitored under this condition. The pH, acidity of the culture and the ethanol tolerance of this bacterium were also tested. Through these experiments, we were able to optimize the growth condition of lactic acid bacteria by the addition of skim milk. This was also able to affect the change of pH, acidity, sugar concentration and alcohol tolerance, which might contribute to the improvement of the quality of rice wine. The optimal condition for the growth was 2 days with 10% (w/v) of skim milk concentration. With these results, it was confirmed that rice koji was an effective carbon source for the growth of lactic acid bacteria.