물체 색정보와 예전 제거기록을 활용하는 새로운 그림자 제거방법

최혜승,왕아곤,소영성,Choi Hye-Seung,Wang Akun,Soh Young-Sung 한국정보처리학회 2005 정보처리학회논문지B Vol.12 No.4

Object extraction is needed to track objects in color traffic image sequence. To extract objects, we use background differencing method based on MOG(Mixture of Gaussians). In extracted objects, shadows may be included. Due to shadows, we may not find exact location of objects and sometimes we find adjacent objects are glued together. Many methods have been proposed to remove shadows. Conventional methods usually assume that color and texture information are preserved under the shadow. Thus these methods do not work well if these assumptions do not hold. In this paper, we propose a new robust shadow removal method which works well in those situations. First we extract shadow pixel candidates by analysing color information and compute the ratio of shadow pixel candidates over the total number of Pixels. W the ratio is reasonable, we remove shadow candidate Pixels and if not, we use data in history array containing Previous removal records. We applied the method to real color traffic image sequences and obtained good results. 칼라 교통 영상열에서의 물체 추출을 위해 우선 MOG(Mixture of Gaussians)에 기반한 배경차이 방법을 이용한다. 추출한 물체에는 그림자가 포함되어 있을 수 있다. 이 그림자로 인해 물체의 정확한 위치를 찾기 힘들고 때에 따라서는 옆의 물체와 붙어 버릴 수도 있다 그림자 제거를 위한 여러 가지 방법이 제안되었다. 기존 연구는 대개 칼라나 텍스쳐 성분이 그림자 밑에 유지되고 있는 것으로 가정하였으며 이 가정이 성립하지 않는 경우에는 어려움이 있다. 본 논문에서는 이 가정이 성립하지 않는 경우에도 견고하게 그림자를 제거하는 방법을 제안하였다. 우선 색정보에 기반하여 그림자 화소 후보를 추출하고 전체 물체 크기에 대한 그림자 화소수의 비율을 계산한다. 비율이 적절하면 그림자 화소 후보를 제거하고, 과도하면 예전 제거 기록을 가지고 있는 history way를 활용하여 그림자를 제거한다. 제안된 방법을 실제 칼라 교통 영상열에 적용하여 좋은 결과를 얻었다.

축제식양식장에서 사육한 돌돔, Oplegnathus fasciatus의 백점충, Crytocaryon irritans 감염 특성

최혜승 ( Hye Sung Choi ),방종득 ( Jong Duk Bang ),박명애 ( Myoung Ae Park ) 한국어병학회 2010 한국어병학회지 Vol.23 No.3

2009년 7∼12월, 축제식 양식장에서 돌돔의 백점충 감염 조사결과, 감염률은 20.0∼88.0%로 9월이 높았고 7월이 낮았다. 7, 8월에는 죽는 개체가 없었으나 9월 중순 이후에는 폐사가 발생하였다. 수온 19.3∼24.3℃, 용존산소 5.0∼7.1 ㎎/L, pH 8.0∼8.1, 염분 31.9∼33.7psu로 폐사 발생시의 수온은 약 24.0℃ 였다. 백점충 감염초기의 외부증상으로는 돌돔의 활력은 양호하였으나 체표에 점액분비로 번들거림을 확인 수 있었으며, 대량폐사가 발생한 시기인 10월에는 점액분비 과다, 꼬리지느러미 탈락 및 발적, 체표 출혈반점과 안구충혈 증상을 보였으며 유영력이 매우 저하되어 있었다. 내부증상으로 간, 장 충혈 및 비장 비대 증상을 나타내었다. 백점충은 아가미의 호흡상피 아래 조직 내에 매몰되어 기생기와 자유유영기 상태였음을 확인하였다. 백점충은 7월경에 감염되어 수온 상승과 함께 사료급이량 증가와 돌돔의 빠른 성장이 백점충 증식의 호조건 조성으로 폐사가 더욱 가중된 것으로 추정되었다. 조사기간 중 간중량지수 (HSI)는 1.9±1.1∼3.5±1.7 %로 폐사발생기인 9월에 가장 낮았으며, 11월에 가장 높았다. 백점충에 감염된 돌돔 혈액의 헤마토크릿트 값은 7, 8월에 각각 37.3%, 41.0%, 9, 10월에 각각 32.14%, 24.17%로 차이를 보였다. 총콜레스테롤, 중성지방은 7, 8월에 비해 10월에 급격한 저하를 보였고, 폐사 발생후 AST는 약 7배, ALT는 약 5배 높았다. Crytocaryon irritans infection of rock bream was investigated in embankment fish farm from July to December 2009. Prevalence variation was 20.0∼88.0% that was high in september and was low in July. While no mortality was found in July and August, it occurred after mid september. Environmental conditions during the survey period were water temperature 19.3∼24.3℃, dissolved oxygen 5.0∼7.1 mg L-1 and salinity 31.9∼33.7 psu, and the water temperature during mortality season was 24.0℃. External symptom of the rock bream was secretion mucus but swimming showed fine in the early infected period. While, the symptoms in the severe outbreak season were excess of mucus, falling off tail and congestion, bleeding spot the surface and weakened swimming. We observed free living and parasitic stages in the gills and body surface of rock bream. Hepato somatic index (HSI) was 1.9±1.1∼3.5±1.7%, which was low in the September being mortality season but was high in November. The percentages of hematocrit infected with Crytocaryon irritans were 37.3% and 41.0% in July and August, respectively while they gradually decreased to 32.1% and 24.2% in september and October, respectively. Total cholesterol and Triglyceride values rapidly decreased by October. After mortality, AST and ALT were 7 and 5 folds higher compared to non-mortality season.

해상가두리 양식장에서 배합사료 및 생사료 공급에 따른 조피볼락, Sebastes schlegeli 의 병리조직학적 변화

최혜승(Hye-Sung CHOI),이무근(Mu-Kun LEE),허민도(Min-Do HUH),손맹현(Maeng-Hyun SON),안철민(Cheul-Min AN),김강웅(Kang-Woong KIM),김신권(Shin-Kwon KIM),김경덕(Kyoung-Duck KIM) 한국수산해양교육학회 2012 水産海洋敎育硏究 Vol.24 No.5

A histo-pathogical examination was carried out to evaluate the effect of commercial extruded pellet (EP) and a raw fish moist pellet (MP) diet on the health of juvenile rockfish cultured in marine net-cage for 7 months. Fish were distributed randomly to each net cage as a group of 76,000 fish (initial mean body weight 5.9 g). After 2 months, the hypertrophy or swelling of liver parenchymal cells was identified in most individuals and lasted until 7 months. Livers in EP fed group frequently showed hypertrophic parenchyma and fatty change with occasional atrophic cells. However, after 4 months, lymphocytic infiltration in splenic parenchyma was seen in a number of individuals. In addition, the gastric glandular epithelium was atrophied and in the lumen of renal tubules protozoan parasites were frequently identified but there was no correlation with the type of feed. Moreover, juvenile rockfish on EP diet showed gross and microscopic hypertrophy of the liver which would be due to oversupply of feed. Severe hepatic cellular hypertrophy or swelling could lead to the damage of microcirculation. Especially fatty change and atrophic change of liver could be the result from the damage, which could be responsible for immunological problem. Lymphocytic infiltration of spleen on the MP diet suggests that juvenile rockfish could be frequently exposed to infectious antigens.

해상가두리양식장에서 사육한 교잡종 (참돔♀ × 감성돔♂), 긴키돔, 참돔 및 감성돔의 질병 특성

최혜승 ( Hye Sung Choi ),도정완 ( Jeong Wan Do ),박명애 ( Myoung Ae Park ),안철민 ( Chul Min Ahn ) 한국어병학회 2012 한국어병학회지 Vol.25 No.3

교잡종, 참돔 및 긴키돔은 수온이 19.7℃에서 24.0℃로 상승하는 7월부터 8월에 가장 높은 성장률을 나타낸 반면, 감성돔은 수온이 23.0℃에서 19.9℃로 하강하는 9∼10월에 가장 높은 성장률을 나타내었다. 생존율은 조사기간 동안 교잡종이 가장 높은 것으로 조사되었지만 이러한 높은 생존율이 잡종 강세의 특성에 의한 것인지에 다른 요인에 의한 결과인지는 추후 자세한 연구가 필요할 것으로 생각된다. 감성돔 종 0∼90%, 참돔 20∼100%, 감성돔 10% (10월), 긴키돔 20∼100%로 유의적인 차이는 없었지만 교잡종에서 다소 낮은 편이었다. Hybrid of red seabream (Pagrus major) and Japanese red seabream (Pagrus major) grew rapidly from to August (WT 19.7℃∼24.0℃) while black seabream (Acanthopagrus major) did from September to October (WT 19.9∼23. 0℃). Survival rate of hybrids (85.5%) was a significantly higher than those of the other fish species (20%). Green liver syndrome were observed in black sea bream and Japanease red seabream but did not in hybrids. Microcotyle tai infected 0∼90% in hybrid, 20∼100% in red seabream, 10% in black sea bream and 20∼100% in Japanese red seabream but no significant difference was found among each fish species.

여윔증상 넙치, Paralichthys olivaceus로부터 분리된 병원균의 임상적 고찰

최혜승 ( Hye Sung Choi ),전려진 ( Lyu Jin Jun ),김승민 ( Seoung Min Kim ),정현도 ( Hyun Do Jeong ),김이경 ( Yi Kyung Kim ),임희영 ( Hee Young Lim ),여인규 ( In Kyu Yeo ),정준범 ( Joon Bum Jeong ) 한국어병학회 2012 한국어병학회지 Vol.25 No.2

Two bacteria strains were isolated from emaciated olive flounder (Paralichthys olivaceus) in aquafarm and were identificated as Vibrio harveyi (JV1) and Edwardsiella tarda (JE1), respectively. In the challenge experiments, we found 100% cumulative mortalities in all of olive flounder injected with JV1, JE1 or JV1+JE1 within eleven days after the injection. Two bacteria strains were reisolated from dead fish and were analyzed using the PCR method. In the physilogical analysis, the hematocrit, AST, ALT and cholesterol levels in experimental groups were increased significantly compared to those in control group, but the glucose, total protein and triglyceride levels were significantly decreased. Additionally, the lysozyme activity in the blood serum was decreased. The histopathological observations of the intestine showed that all groups had detachment and destruction of epithelial tissues except for the control group.

지수식 양식장의 수온, 사육밀도, 어체크기가 필리핀산 뱀장어(Anguilla bicolor pacifica) 성장에 미치는 영향

최혜승(Hye-Sung CHOI),김형곤(Hyoung-Gon KIM),이정호(Jeong-Ho LEE),김봉래(Bong-Rae KIM),이영식(Young-Sik LEE) 한국수산해양교육학회 2017 水産海洋敎育硏究 Vol.29 No.4

To develop aquaculture technologies for Philippines eels (Anguilla bicolor pacifica), replacing Japanese eels (Anguilla japonica), three different culture experiments were conducted with water temperature(30 days), stocking density by fish size(60 days), size variation(360 days) at different water temperatures, fish sizes and stocking densities in intensive pond culture systems for 360 days. The fish group at 29℃ showed the best yield (mean weight of 0.98±0.03 g, survival rate of 96.33±1.26%, specific growth rate of 5.77±0.24% and feed conversion rate of 1.18±0.05) than other water temperature. Optimum yields for mean weights of 3 g, 8 g, 13 g, 18 g and 40 g were found at 469 eels/㎡, 78~156 eels/㎡, 78~156 eels/㎡, 78~156eels/m2 and 78 eels/㎡, respectively(p<0.05). The growth yields of large, medium, and small size groups were 213.20±108.02 g, 145.67±51.10 g, and 7.88±4.98 g, respectively and the feed conversion rate of the small group with low growth rate were not as good as those in the other groups. Eels in the large size group could reach the marketable size in 360 days, while eels showing the growth retardation occupied 10.5~19.0% in total population.

2006~2008년 남해안 통영,거제해역의 양식 조피볼락, Sebastes schlegeli 병원체 감염 현황

최혜승 ( Hye Sung Choi ),지보영 ( Bo Young Jee ),조미영 ( Mi Young Cho ),박명애 ( Myoung Ae Park ) 한국어병학회 2010 한국어병학회지 Vol.23 No.1

2006~2008년 (3년간) 남해안 거제, 통영지역의 해상가두리양식장에서 사육된 조피볼락 579마리에 대한 병원체 감염률을 조사한 결과, 병원체 검출률은 46.0~92.0%로 연중 보균하고 있는 것으로 나타났으며, 수온상승기인 5월에 평균 58.1%로 낮았고, 수온하강기인 10월에 평균 81.5%로 높았다. 병원체 감염은 수온상승기인 5월과 고수온기인 8월에 기생충 단독감염이 대부분이었으나, 수온하강기인 10~11월에는 기생충 단독감염 뿐만 아니라 세균 단독, 세균과 기생충 혼합, 바이러스 단독 감염되고 있는 것으로 조사되었다. 조피볼락의 질병은 기생충성 질병 중에 Microcotyle sp.와 Caligus sp., 세균성 질병에 Vibrio sp.와 Streptococcus sp., 바이러스성 질병에 RSIV와 VNNV가 우점종으로 나타났다. 2006년도에는 바이러스가 검출되지 않았으나, 2007년도에 VNNV, VHSV 및 RSIV가 검출된 것은 2006년에 비해 여름철 수온이 1.5~2.0℃ 높았기 때문으로 추정되었다. 크기별 병원체 검출률은 11~15 ㎝에서 50.0~87.1%로 가장 높았으며, 30㎝이상에서 감소되는 경향이었다. 기생충은 50.0~79.6%로 총 병원체 검출률과 비슷한 경향이었으며, 세균은 1.6~23.8%로 10㎝이하와 26㎝이상에서 높았으며, 바이러스는 0~21.5%로 25㎝이하의 그룹에서 높은 것으로 나타났다. Pathogens on the cultured 579 rockfish, Sebastes schlegeli in the marine cage farms from Geoje and Tongyeong of the Southern sea were investigated from 2006 to 2008. The pathogens were detected throughout the year at 46.0~90.0% for 3 years and the detection rate was low with an average 58.1% in May and high with an average 81.5% in October. Bacteria only, bacteria-parasite mix and virus only were found in October and November as well as parasite only, whereas infection of parasite only was dominant in May when the temperature increased and in August when the temperature peaked. Of rockfish, Microcotyle sp. and Caligus sp. were dominant for parasitic disease, and Vibrio sp. and Streptococcus sp. were dominant bacteria. For virus, RSIV and VNNV were detected as dominant organisms. While no virus was detected in 2006, VNNV, VHSV and RSIV were detected in 2007 due to 1.5~2.0℃ higher temperature than 2006 in the summer season. For total prevalence by rockfish sizes, the highest was found at 50.0~87.1% in 11~15㎝ sizes and 50% was found in 30㎝ size. Parasite showed a similar trend of 50.0~79.6% as the total prevalence. Prevalence for bacteria varied from 1.6% (for 10㎝ group) to 23.8% (for 26㎝ group) and higher virus prevalence of 21.5% was found from below 25㎝ group.

저수온기 양식 조피볼락, Sebastes schlegeli 간에 대한 조직병리학적 연구

최혜승 ( Hye Sung Choi ),허민도 ( Min Do Huh ),이무근 ( Mu Kun Lee ),최희정 ( Hee Jung Choi ),박명애 ( Myung Ae Park ) 한국어병학회 2011 한국어병학회지 Vol.24 No.3

This study was aimed to determine the fish physical status according to the gross and histopathological findings of liver in cultured black rock fish, Sebastes schlegeli. All 47 fish submitted had no marked abnormalities in the external findings. 42.55% of fish showed normal liver, 25.53% yellow liver, 25.53% atrophic brown liver, 4.26% yellowish-green liver and 2.13% fatty liver in gross examination. Grossly normal liver showed no remarkable change in lobular structure but many vacuoles were found in hepatic cell. Hepatic cells took normal roundish, polygonal shapes containing spherical nuclei. In group of yellow-brown liver, many brown pigments were seen in hepatic cells, MMCs and brown-colored hyaline droplets within cytoplasm of hepatocytes. Yellowish green pigments were seen in hepatic cells and MMCs of yellow green liver and green colored hyaline droplets within hepatocytes. The dilated central veins are highlighted with atrophy of hepatic cells. Outline of atrophic hepatocyte became ambiguous and nucleus frequently become small and pyknotic. Fatty liver showed prominent vacuolar structures in cells as clear spaces or foamy cytoplasm with degenerative nuclei. From these results, it was strongly suggested that hepatic gross and histological findings could be used as important and critical health parameters of fish prior to progression to substantial manifestation as clinical disease.

해상가두리 양식장에서 배합사료 및 생사료 투여에 의한 조피볼락, Sebastes schlegeli 건강도

최혜승(Hye-Sung CHOI),허민도(Min-Do HUH),손맹현(Maeng-Hyun SON),김강웅(Kang-Woong KIM),김경덕(Kyoung-Duck KIM) 한국수산해양교육학회 2013 水産海洋敎育硏究 Vol.25 No.6

The purpose of this research is to evaluate the effects of a commercial mixed extruded pellet(EP) and raw fish moist pellet(MP) diet on diseases prevalence and serological constituents and HSI of korean rockfish, Sebastes schlegeli grown in two commercial-scale aquaculture farms from June to December in 2009. The growth of MP-fed rockfish was slightly faster than EP-fed rockfish during experimental period, but did not show significant differences. The levels of TCHO, TG, Glucose and TP in the MP-fed rockfish group were higher than those of EP-fed group, whereas there was no significant difference in other biochemical factors of blood between two groups. In addition, bacteria and virus were not detected in both MP- and EP-fed rockfish groups, and the infection rates of gill fluke between two groups did not show clear difference. In conclusion, there was no comparable difference in growth and the health extents of one year rockfish by administration of the commercial mixed extruded pellet(EP) and raw fish moist pellet(MP) diets.

하절기 조피볼락, Sebastes schlegeli의 대량폐사에 관한 고찰

최혜승 ( Hye Sung Choi ),명정인 ( Jeong In Myoung ),박명애 ( Myoung Ae Park ),조미영 ( Mi Young Cho ) 한국어병학회 2009 한국어병학회지 Vol.22 No.2