• 수산해양교육연구
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• 제24권3호
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• pp.378-386
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• 2012

The objective of this study was to search the attributes and calculate the weights among the attributes considered to choose the best thing of various tourism resources focused on marine ranch of Chagwido in Jeju region. Through this analysis, this research provides the information for establishing development plan of Chagwido. To achieve this goal, this study analyzed the priority of experience tourism through the experts' survey with AHP methodology. The result showed that ecological experience (30.6%), fishing activities (23.1%), release of fish seed (14.9%) and culture experience (14.9%) among various tourism resources in marin ranch of Chagwido were in order of importance. Thus ecological experiences, activities related to fishing facilities and programs should be introduced in order to develop the marine ranch of Chagwido.

• 수산경영론집
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• 제47권2호
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• pp.33-41
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• 2016

The purpose of this study is to estimate the economic value of boat fishing experience marine tourism activity in Jeju Island's Chagwido. The economic value is estimated as consumer surplus using count data models including the truncated Poisson model and the truncated negative binominal distribution model. This study collects the effective 504 questionnaires from boat fishing experience tourists in Jeju Island's Chagwido. The truncated negative binominal distribution model was statistically more suitable and valid than other models. The truncated negative binominal distribution model was applied to estimate consumer surplus as economic value from boat fishing experience tourism activity in Jeju Island's Chagwido. A consumer surplus value per trip was estimated as about 209,900 won. The annual economic value from boat fishing experience tourism activity was estimated as 273,700 won in Jeju Island's Chagwido. Consequently, boat fishing experience marine tourism activity has a very large economic value in Jeju Island.

• 수산경영론집
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• 제47권4호
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• pp.45-55
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• 2016

The purpose of this study is to estimate the utility value of boat fishing experience marine tourism activity in Jeju Island's Chagwido. The utility value is estimated by single bounded and double-bounded dichotomous choice contingent valuation method. The contingent valuation method is used to estimate economic values for all kinds of coastal ecosystem services. The method involves directly asking people, in a survey, how much they would be willing to pay for specific environmental services. So, the method has great flexibility, allowing valuation of a wider variety of non-market goods and services than is possible with any other non-market valuation technique. This study collects the effective 504 questionnaires from boat fishing experience tourists in Jeju Island's Chagwido. The results show that the average willingness to pay amount(WTP) is estimated to be about 17,000 Korea won by single bounded and double-bounded dichotomous choice contingent valuation method. This indicates that the utility value of boat fishing experience marine tourism activity is estimated to be about 17,000 Korea won in Jeju Island's Chagwido.

• Animal Systematics, Evolution and Diversity
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• 제30권4호
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• pp.323-326
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• 2014

Colonial ascidian, Eusynstyela monotestis (Tokioka, 1953), is newly reported from Korean waters. The specimens of E. monotestis examined in this study were collected at subtidal zone of Beomseom, Munseom, Seopseom and Chagwido in Jeju-do by SCUBA diving. The genus Eusynstyela Michaelsen, 1904 is also new to Korean waters and it is distinct from other genera by having branchial sac with folds, longitudinal stigmata, hermaphrodite gonads on both sides, 1-2 male follicles in each gonad and body wall with endocarps. Eusynstyela monotestis is distinct from other species by having gonad with only single male follicle. In this paper, detailed descriptions and photographs of Eusynstyela monotestis (Tokioka, 1953) are provided.

• Animal Systematics, Evolution and Diversity
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• 제31권1호
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• pp.1-7
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• 2015

Colonial ascidians, Clavelina elegans (Oka, 1927) and Clavelina miniata Watanabe & Tokioka, 1973 are reported for the first time in Korean waters. As a result of this study, three species of the genus Clavelina are now recorded in Korean fauna. Clavelina elegans and C. miniata have been reported only from Japan. We expanded the distribution range of these species to Korea. The specimens of C. elegans and C. miniata were collected from the subtidal zone of Beomseom and Chagwido in Jeju-do by SCUBA diving. Detailed descriptions, illustrations and photographs of these species are provided in this paper.

• 한국패류학회지
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• 제23권2호
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• pp.235-243
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• 2007

제주 바다목장조성지인 차귀도 주변해역의 저서 무척추동물에 대한 출현 및 계절적 변동을 파악하기 위해 고산, 용수, 용당, 신창의 4개 해역을 설정하여 2004년 9월과 11월 및 2005년 2월, 4월, 6월, 8월 등 모두 6 차례에 걸쳐 조사 분석을 하였다. 조사기간 중 총 201 종의 저서동물이 출현하였다. 연체동물이 74 종 (37.2%) 으로 가장 높게 나타났다. 이 중 복족류가 28.4%로 가장 우점 하였고, 절지동물 43 종 (19.2%), 자포동물 34 종 (16.7%) 의 순으로 나타났다. 조사해역의 평균 개체밀도와 생물량은 각각 455 개체/$m^2$ (53.9%), 15,565.0g/$m^2$ (64.4%) 로 종류와 마찬가지로 연체동물이 개체수와 생체량에서 가장 높게 출현하였다. 주요 우점종은 Trochus sacellus, Batillus cornutus, Pagurus gracilipes, Cantharus cecillei의 복족류에서 높은 우점률을 보였다. 계절별 출현양상은 하계에 개체수 및 생체량이 증가하다 동계로 갈수록 감소하는 경향을 보였다. 그리고 종 다양도, 균등도, 풍부도의 해역별 변동을 보면 조사해역의 남쪽에 위치해 있는 고산에서 상대적으로 높게 나타난 반면, 북쪽에 위치한 신창에서 가장 낮게 나타나는 경향을 보였다.

• 한국어류학회지
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• 제27권4호
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• pp.284-292
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• 2015

이 연구는 제주도 주변 4개의 정점에서 채집된 어란의 월별 종조성 및 출현량을 알아보기 위해 실시하였다. 현장조사는 2006년 8월부터 2007년 7월까지 봉고네트를 이용하여 월별로 표층채집을 하였으며, 종동정은 채집된 어란의 미토콘드리아 cytochrome b 유전자 (cyt b) 염기서열을 성어 염기서열과 상호 비교함으로써 이루어졌다. 채집된 어란은 총 43개의 분류군으로 분류되었고, 이중 34종 (6목 24과 33속)은 종 (species)까지 동정이 이루어졌다. 나머지 9종 가운데 4종은 과 (family)까지 동정할 수 있었고, 5종은 미동정되었다. 지역별로 제주항 근해에서는 23개의 분류군으로 가장 많은 분류군이 나타났고, 성상포 근해에서 21개, 서귀포항 근해에서 19개, 차귀도 근해에서는 18개의 분류군이 출현하였다. 시기별로는 2006년 9월에 15개의 분류군으로 가장 많이 나타났고, 12월과 7월에 3개의 분류군으로 가장 적게 나타났다. 동정이 이루어진 34종 중 멸치 (E. japonicus)와 노랑벤자리 (C. japonicus)가 가장 높은 출현 빈도를 보였으며, 멸치는 표층수온 $14.0{\sim}28.6^{\circ}C$에서, 노랑벤자리는 $14.9{\sim}20.5^{\circ}C$에서 출현하였다. 이번 연구에서 사용된 cyt b 유전자의 PCR 증폭 성공률은 68.3%였으며, 종동정률은 79.1%였다.

• Ocean Systems Engineering
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• 제8권4호
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• pp.361-380
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• 2018

The dynamic performance of the wave energy converter (WEC) rotor with different geometric parameters such as depth of submergence and beak angle has been assessed by considering the linear potential flow theory using WAMIT solver and along with the computational fluid dynamics (CFD). The effect of viscous damping is incorporated by conducting numerical free decay test using CFD. The hydrodynamic coefficients obtained from the WAMIT, viscous damping from the CFD and estimated PTO damping are used to solve the equation of motion to obtain the final pitch response, mean optimal power and capture width. The viscous damping is almost 0.9 to 4.6 times when compared to the actual damping. It is observed that by neglecting the viscous damping the pitch response and power are overestimated when compared to the without viscous damping. The performance of the pitch WEC rotor in the Jeju western coast at the Chagwido is analyzed using Joint North Sea Wave Project (JONSWAP) spectrum and square-root of average extracted power is obtained. The performance of WEC rotor with depth of submergence 2.8 m and beak angle $60^{\circ}$ found to be good compared to the other rotors.

• 한국해양공학회지
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• 제34권5호
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• pp.351-360
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• 2020

Of late, demand for test sites for marine equipment such as ASV, AUV, ROV, and various underwater sensors is increasing. The authors have focused on an oscillating water column (OWC), which is being constructed near Chagwido Island Jeju, as one of the test-sites. The main objective of the OWC is to produce wave energy and develop technologies. It has been built in the sea approximately 1 km off the coast. It has berth accommodation and some rooms that can be used as laboratories. To investigate the feasibility of its usage as a test site for marine equipment, we acquired bathymetric data around the OWC by using a multi-beam echo sounder and a single-beam scanning sonar. The accessibility of the OWC from nearby ports and the use of support vessels or ships were also investigated. 3D point cloud data from the multi-beam echo sounder and 2D acoustic images from the scanning sonar are expected to be used as references for identifying changes over time. In addition, through these experiments, we derived a procedure to use this facility as a test site by using the IDEF0 functional modelling method. Based on this preliminary investigation and previously reported examples, we determined the general conditions and preferences for evaluating the performance of various marine equipment heuristically. Finally, we developed five applications that were derived from this investigation.

• 수산해양기술연구
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• 제48권2호
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• pp.128-136
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• 2012

Hybrid surveys using hydroacoustic and fish sampling gears such as trammel net, trap were conducted to investigate total biomass, distribution and dominant fish species of the demersal fishes in the marine ranching area (MRA) of Jeju. Four surveys were carried out in June, August, October and November using 38kHz quantitative echo sounder. Catch data using trammel net and trap were used to calculate biomass and to examine dominant fish species. Fish schools were mainly detected in the waters of 20 meters below and around Chagwido waters. By the result of fishing experiments, fish species living in MRA of Jeju were about 40 species, dominant fish species of a detectable fish such as Family Sparidae and Family Monacanthidae etc. were identified 59.4~68.8% of total biomass. Based on the hydroacoustic data, fish length-weight function and target strength information, mean density of the demersal fish estimated were as follows; 0.88g/$m^2$ on June, 1.12g/$m^2$ on August, 1.35g/$m^2$ on October and 1.18g/$m^2$ on November. An estimated average biomass in MRA of Jeju was founded 20.5 tons in 2007, 20.6 tons in 2008, 23.0 tons in 2009, 25.9 tons in 2010. The results showed that biomass of MRA is getting increased slowly. Therefore the hybrid survey method using hydroacoustic and fish sampling gears is assured an effective biomass survey in the waters of mixed species.