• 한국수정란이식학회지
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• 제28권1호
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• pp.73-78
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• 2013

The present study examined the histological characteristics of adult testis in the long-beaked common dolphin (Delphinus capensis) from Korean waters and the localization of DEAD-box polypeptide 4 (DDX4; a germ cell marker) and vimentin (a Sertoli cell marker) expression in the dolphin testis compared with that in terrestrial mammals, including dogs and rats. The seminiferous tubules of dolphin testis have very small or completely closed lumens, and spermatogenic cells and Sertoli cells within the tubules cannot be differentiated. Immunohistochemical analysis showed that, in the dolphin testis, DDX4- and vimentin-positive cells were scattered extensively within the tubule, whereas in the dog and rat testis, DDX4 immunoreactivity was localized in spermatogenic cells of the adluminal compartment, and vimentin immunoreactivity was localized in Sertoli cells of the basal compartment in the seminiferous epithelium. These results suggest that the histological characteristics of the seminiferous tubules in the dolphin testis differ from those of terrestrial species.

• 한국수산과학회지
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• 제51권5호
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• pp.600-605
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• 2018

The Indo-Pacific bottlenose dolphins Tursiops aduncus are the only cetacean species that can be observed visually on coastal areas of Jeju Island and regarded as one of valuable tour resources. We attempted to figure out location and timing information of the dolphin sightings collected from two major social media, Naver $Caf{\acute{e}}$ and Instagram. 142 of dolphin sighting information were derived from 2,501 dolphin related postings on Naver $Caf{\acute{e}}$ between 2004 to 2017. 292 informative postings also were found on Instagram through hashtag searching. The number of posts about dolphin sighting was not frequent until 2014. Since 13 posts were found in 2014, dramatic increase of the sighting numbers was accelerated as 38 in 2015, 93 in 2016 and 269 in 2017. 195 (45.7%) from coastal area of Daejeong-eup, south-western part of the Island, were posted. The number of dolphin sightings also high from Gujwa-eup(n=50, 11.7%), Hangyeong-myeon (n=49, 11.5%), Seongsan-eup (n=38, 8.9%) and Seogwipo-si (n=34, 8.0%). Our results show that social media data has a high potential to be used as a data source for study of distribution pattern of the dolphins.

• 한국항해항만학회지
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• 제37권6호
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• pp.647-653
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• 2013

Energy acquisition due to the increase of oil price is one of the most important issues and policy for most countries. Various tankers have been built in the world and sent to the trade market. It is necessary to build the port infrastructure and facilities to give them proper services such as mooring, packing, storing, and transshipment, etc. However, the domestic guidelines or standards for design and construction for the dolphin berth among these facilities are out of date and do not meet the recent trend of tanker types. Therefore, it requires amendment on the guidelines or standards. In this study, a detailed analysis of the tanker fleet, covering 8,000 ships under operation and order to build, is made to estimate the proper PBL(Parallel Body Length) of each tanker class. After discussion and comparison on the dolphin berth design and construction codes of various countries, those are the leading countries of tanker operation and management, suggestion was made to amend on the design code. The referred codes are of Korea, Japan, UK, USA, and Canada. The analysis of tanker fleet shows the PBL as 0.45L under the normal ballast condition. In order to verify the deduced amendment on the domestic design code for dolphin berth, it was selected one of the domestic dolphin berth, located at the Yeosu oil terminal, which is almost completed to construct. The design criteria and expected tankers to moor in that terminal were analyzed and the appropriateness and countermeasure for deficiency were summarized.

• 수산해양기술연구
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• 제38권4호
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• pp.271-277
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• 2002

고래류의 어업공해를 최소화하고 환경친화적으로 이용할 수 있는 음향 유인/경고시스템을 개발하기 위한 기초연구의 일환으로 우리 나라 연근해에 자주 출현하는 큰돌고래의 휘슬음을 서울대공원 돌고래 쇼장에서 측정, 분석한 결과를 요약하면 다음과 같다. 1 수족관 내에서 생활하고 있는 큰돌고래의 평상시 휘슬음의 중심 주파수대와 스팩트럼 레벨은 각각 6～10KHz 와 85㏈을 나타내었고, 이들을 서로 격리시킨 경우, 중심 주파수는 6.7KHz대와 21.3KHz대 두 개의 고조파를 나타내었으며, 스팩트럼 레벨은 각각 110㏈와 94㏈를 나타내어 평상시보다는 불안정한 휘슬음의 주파수대와 다른 형태를 나타내었다. 2. 평상시의 휘슬음 주파수 변동폭은 평균 3.86KHz이었고, 지속시간은 평균 0.08sec를 나타내었다. 그러나 격리시킨 경우는 평상시와는 달리 그 변동폭은 평균 l4.06KHz이었고, 지속시간은 평균 0.l9sec를 나타내어 평상시와 비교하여 주파수 변동폭이 10.20KHz 높아지고 지속시간은 0.11sec 길어짐을 알 수 있었다. 더욱이 Mann-Whitney 검정을 통하여 휘슬음의 주파수 변동폭과 지속시간 모두 평상시와 1마리를 격리시켰을 때는 상이함에 유의성을 확인할 수 있었다. 3. 돌고래 쇼장에서의 휘슬음의 패턴 모델을 6가지 형태로 분류할 수 있었고, 평상시에는 5～10KHz 범위의 주파수로 서서히 상승하는 형이 거의 대부분이었으나, 격리시킨 경우에는 5～20KHz의 폭 넓은 주파수대에 걸쳐 여러 가지 패턴을 관찰할 수 있었으며, 특히 주파수가 상승한 후 일정하게 유지되는 형태의 패턴이 많이 관찰되었다. 한편, 휘슬음은 종간 및 생활환경에 따라 사용되는 주파수 대역폭이 서로 다른 것을 예상할 수 있으므로 우리 나라 연안에는 큰돌고래, 참돌고래, 낫돌고래, 상괭이 등 비교적 많은 돌고래류가 자주 출현하고 있어 이들 종들에 대한 위협음 및 유인음에 대한 대역을 파악하기 위해서는 각 종들에 대한 수중음향은 물론 행동도 함께 분석할 필요가 있으며 더욱이 폭 넓은 현장실험과 데이터 축적을 병행하여야 할 것이다.

• 대한치과교정학회지
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• 제24권3호
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• pp.521-534
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• 1994

The purpose of this study was to compare the differences in measurements between cephalometric radiographs and digigraphs of Dolphin Imaging System. 26 Korean adult male and 24 adult female with normal occlusion were selected. For each subject lateral cephalogram was taken. Digitizing with Digigraph Work Station of Dolphin in System. was performed as well. 50 tracings and 50 digigraphs were analyzed with Yonsei, Ricketts, Burstone analyses. The comparable measurements between tracing group and digigraph group were statistically analyzed. The results were as follows: 1. 13 of 64 comparable measurements did not show any statistically significant difference (P>0.05) between tracing group and digigraph group. 2. Three of the measurements with FH plane as a reference plane did not show any statistically insignificant difference. All measurement with SN plane as a reference plane showed statistically significant difference(p<0.05). 3. The measurements which showhed no statistically significant difference were mostly short distance linear measurements while most of the angular measurements showed statistically significant difference(p<0.05).

• Fisheries and Aquatic Sciences
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• 제11권3호
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• pp.166-171
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• 2008

The feasibility of photo-identification techniques for the bottlenose dolphins from Jeju Island, Korea, and the potential for dolphin watching were simultaneously evaluated in this study. During the sighting survey, a pod of bottlenose dolphins composed of approximately 30 individuals was observed in the southwestern coastal area of Jeju Island. Among 35 suitable photographs, five bottlenose dolphin individuals were identified and cataloged using unique nicks and notches on their dorsal fins. This shows that the Jeju Island dolphins can be individually identified by the nicks and notches on their dorsal fins using photo-identification techniques. Furthermore, the Jeju Island population appears to be suitable for long-term population biology studies using this technique. The potential for dolphin watching around the island would be higher if more information on the seasonal distribution, movement, and residency of this population were obtained.

• 한국전산구조공학회논문집
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• 제19권1호
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• pp.105-111
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• 2006

돌핀계류시스템은 부유식 해양구조물의 계류장치로서 강도 및 유용도 관점에서 바람직한 대안이 될 수 있다. 돌핀계류시스템 설계과정에서 정확한 파력산정과 필요한 지지파일의 개수선정은 주요 설계요인이 된다 본 논문에서는 파의 충격하중을 포함한 외력에 대한 구조해석을 통하여 적정한 돌핀시스템의 설계과정과 형식을 제시하였다. 부유식 해양구조물을 위한 돌핀계류시스템의 경우 다수의 지지파일시스템보다 단주의 지지파일시스템이 설계관점에서, 제한적이기는 하나, 유용성이 높다는 점을 알 수 있었다.

• Structural Engineering and Mechanics
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• 제55권3호
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• pp.535-554
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• 2015

Dolphin echolocation (DE) optimization algorithm is a recently developed meta-heuristic in which echolocation behavior of Dolphins is utilized for seeking a design space. The computational performance of meta-heuristic algorithms is highly dependent to its internal parameters. But the computational time of adjusting these parameters is usually extensive. The DE is an efficient optimization algorithm as it includes few internal parameters compared with other meta-heuristics. In the present paper a modified Dolphin echolocation (MDE) algorithm is proposed for optimization of steel frame structures. In the MDE the step locations are determined using one-dimensional chaotic maps and this improves the convergence behavior of the algorithm. The effectiveness of the proposed MDE algorithm is illustrated in three benchmark steel frame optimization test examples. Results demonstrate the efficiency of the proposed MDE algorithm in finding better solutions compared to standard DE and other existing algorithms.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 추계학술대회 논문집
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• pp.57-62
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• 2000

The very large flcating structure which am be used for as airport may be as large as several kilomet wide. The first order wave forces as well as wave drift forces are very important forces on such a very large floating In the present studv, the time simulation of motion responses with dolphin-moored VLFS in waves is presented The coeffcients and wave forces involved in the equations are obtained from a three-dimensionul panel method in the frequc The horizontal drift forces and mooring forces for dolphin systems are taken into account. As for numerical example, analyses are carried out for a VLFS in irregular wave condition

• 한국임상수의학회지
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• 제19권2호
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• pp.250-252
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• 2002

A 14-year-old female Gill's bottle-nosed dolphin died after having 1 month history of depression, anorexia, and respiratory insufficiency. At necropsy, numerous well-demarcated tan firm nodules in variable sizes ranging from 2 m to 3 cm in diameter were scattered throughout the lung lobes. Histologically, the pulmonary nodules formed typical granulomatous inflammation. Center of the granulomatous foci consisted of necrotic center with gram positive cocci surrounded by eosinophilic Splendore-Hoeppli material then by macrophages, epithelioid cells, multinucleated giant cells, a few lymphocytes and fibroblasts. The is the first report of pulmonary botryomycosis in dolphin in Korea.