• Korean Journal of Ichthyology
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• v.23 no.1
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• pp.37-45
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• 2011

Seasonal variation in species composition and abundance of fish larvae assemblages in the south-western Jinhae Bay were investigated monthly in 2009. During the study period, 49 larvae species belonging to 24 families were collected. The dominant species were Clupea pallasii, Hexagrammos otakii, Konosirus punctatus, Engraulis japonicus, Parablennius yatabei, and Omobranchus elegansei. These six species accounted for 92.7% of the total number of individuals collected. The number of species, number of individuals, and species diversity indices fluctuated with the seasons. The peak number of species and individuals occurred in July and January, respectively. Principal component analysis(PCA) and correlation analysis showed that variation in monthly water temperature could act as an indicator of seasonal variation in community structure and abundance of the dominant species; in particular, those of C. pallasii, H. otakii, E. japonicus and P. yatabei corresponded with the water temperature.

• Korean Journal of Ichthyology
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• v.10 no.1
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• pp.11-23
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• 1998

A total of 64 fish species was collected by an otter trawl in the coastal water off Namhae Island from May 1989 to April 1990. The dominant species were Acentrogobius pflaumii, Chaeturichthys hexanema, Chaeturichthys sciistius, Thryssa kammalensis, and Repomucenus valenciennei which accounted for approximately 66.5% of the total numbers and 34.5% of biomass of fish collected. Fish collected in the study area were primarily small fish species or early juverniles of large fish species. Only about 15%, exceeded 10cm in standard length. Seasonal variations in both species composition and abundance of fishes were major characteristics in the study area. The peak abundance occurred in April and September, while the number of species was relatively high from October to January. However, both the number of species and abundance of fishes showed the lowest values in winter.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.34 no.3
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• pp.309-319
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• 1998

Species composition and seasonal variations of fishes collected by winged stow net on anchors in the coastal water off Namhae Island was studied from May 1989 m April 1990. During the study period, a total of 56 fish species were collected. Engraulis japonicus, Conger myriaster, Trichiurus lepturus, Sardinella zunasi, Ammodytes personatus, and Thryssa kammalensis predominated. These six species accounted for 93.9% of the total number and 81.3% of the total biomass of fishes collected. Fishes collected by winged stow nets on anchors were primarily small fish species or early juveniles of large fish species. Both abundance and species composition of fishes changed with season. Seasonal peaks of number of species occurred in spring and fall, while those of number of individuals and biomass occurred in spring. The lowest number of individuals and biomass were observed in winter. Low species diversity indices were observed in summer. These low diversity indices in summer were mainly due to predominance of E. japonicus which accounted for approximately 90% of all fishes collected. More species and greater biomass were collected during nighttime.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.33 no.4
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• pp.288-301
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• 2000

The species composition and seasonal variation of fish assemblage in the coastal water off Gadeok-do, Korea were studied using the monthly trawled samlpes through a year of 1998. During the study period, 110 species of fishes from 57 families were collected. Repomucenus valenciennei, Thryssa kammalensis, Leiognathus nuchalis and Zoarces gilli dominated the fish assemblage throughout the year, and were responsible for $ 57.6{\%}$ and $37.2{\%}$ in the number of individuals and biomass, respectively. Fish species of secondary importance in abundance were Sillago japonica, Apogon lineatus, Pholis fangi, Engraulis japonicus, Thryssa adelae, Pho;is nebulosa, Conger myriaster, Liparis tanakai, Acentrogobius pflaumii, Limanda yokohamae, Chaeturichthys hexanema, Erisphex pottii and Cunoglossus abbreviatus. Higher numbers of species were collected in spring and autumn than in summer and winter. Abundance was high in spring and autumn, and low in summer and winter, Species diversity indices showed that the fish assemblage was more diverse in autumn than any other seasons.

• Korean Journal of Ichthyology
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• v.20 no.4
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• pp.291-302
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• 2008

Seasonal variation of species composition in the coastal waters off Wangdol-cho were investigated using the catches by gill net and trammel net from 2002 to 2004. A total of 58 species was collected and classified into 15 orders and 34 families. Of the 58 species identified, Scorpaeniformes and Perciformes accounted for 62.1% of the species. 35 species in 11 orders and 22 families were collected by gill net and 51 species in 15 orders and 30 families were collected by trammel net. The number of species was high in summer and autumn and lowest in winter. Catches were correlated with sea water temperature. The numbers of individuals and their biomass were 5,295 inds. and 1,890 kg, with the highest values achieved in summer and the lowest in spring. The most dominant species were Pleurogrammus azonus and Gadus macrocephalus. The seasonal species community showed a high similarity between summer and autumn.

• Korean Journal of Ichthyology
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• v.18 no.3
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• pp.251-265
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• 2006

To investigate the impingement of fish on the traveling screens, fishes were collected from the traveling screens at Hadong Power Plant through the year of 1999. A total of 84 fish species were collected during the study period. The dominant species were Leiognathus nuchalis, Engraulis japonicus, Trichiurus lepturus and Takifugu niphobles. These four species accounted for 78.2% of the total number of individuals and 52.0% of total biomass collected. The number of fish species, number of individuals, biomass and species diversity indices fluctuated with the seasons. The number of species and biomass were high in April and August, and the number of individuals was high in April and July. However, the number of fish species, number of individuals and biomass of fishes showed low values in winter.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.24 no.3
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• pp.439-447
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• 2019

Some dynamical issues about the Tsushima Warm Current (TWC) are reviewed and checked for the remaining unresolved problems, focusing on the formation of the TWC, seasonal variation of its volume transport and its branching in the East Sea. The TWC is a part of the North Pacific (NP) subtropical gyre driven by the NP global wind system. However, the quantitative amount of volume transport is sensitive to friction, basin geometry, barrier effect and so on. Among many causes suggested by many scientists, subpolar winds are found to be most closely related with the seasonal variation of TWC volume transport. However, more studies relating the latter not only to the subpolar winds but also to those including the subtropical winds seem to be required. The branching of the TWC has been known to be due to the western intensification for the East Korean Warm Current (EKWC) and to the bottom trapping for the Nearshore Branch. Since the former hypothesis is problematic in explaining the seasonal variation of the EKWC, other candidate mechanisms may need to be considered.

• The Korean Journal of Applied Statistics
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• v.13 no.2
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• pp.321-328
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• 2000

Working day variations caused by trading days, holidays and leap year make it difficult to analyze monthly or quarterly economic time series. In this paper, we adjust working day variations from economic time series via RegARIMA model.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2001.11a
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• pp.165-167
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• 2001

미래 저수온 에너지 자원인 동해 심층 냉수의 효율적이며 안정적 활용차원에서 국립수산진흥원에서 조사한 동해 연근해역 수심별 수온자료(1961～2000년)를 이용하여 $1^{\circ}C$ 심층냉수의 표면수위 변동 양상을 정량화한 결과, 포항 연근해에서 주문진 연근해역까지 어디든 수심 250～300m 정도에서 $1^{\circ}C$ 심층냉수를 채취할 수 있으나 (계절 변동 수심폭 50m 이내), $1^{\circ}C$ 심층냉수의 표면 수위 변동에 대한 년별 이상 변동이 -150m~+200m 범위로 다소 커 현장 설치시 양수용 파이프의 길이가 적어도 450m는 되어야 한다는 결론을 얻었다.

• Journal of the Korean Statistical Society
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• v.5 no.2
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• pp.129-142
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• 1976

본논문에서는 물가변동을 미래에 투영하여 예측한다기 보다는 물가변동률 결정을 구조적으로 파악하여 보기로 하되, 고전적인 수량방정식의 입장에서 통화와 소득의 영향력을 시차분포로서 추정하는 것을 일차적인 목적으로 하고 있다. 또한 물가변동에 대한 기대형성을 오차수정기대(error-learning expection) 또는 적응기대(adaptive expection) 형태로 설정하여 일종의 마아코프 일단적 확률과정을 만들어 그 영향력을 추정하였다. 추정 결과, 통화변수의 경우에 있었던 하나의 예외를 제외하고는 모두 일반적으로 기대되고 있는 형태로서 얻어졌다. 통화변수의 경우에도 예외로서 얻어진 결과는 그 나름대로 경제적인 해석이 가능하였으며 또한 전례가 없었던 현상이 아니므로 구태여 예외로서 보다는 일반적인 현상으로 합리화될 수 있었다. 흔히 한 물가를 다른 물가로 설명하려는 순환론적인 연구접근방법을 가능한 한 배제하고 확률적인 요인에 의한 설명을 본연구에서는 시도하였다. 따라서 제변수의 공동형세에 따르는 허위상관을 제거하기 위하여 계절변동이 조정되지 않은 대전기 변동율을 기초 자료를 사용하였다. 앞으로 연구내용의 본질적인 개선을 위하여서는 본연구를 출발점으로 하여 추정모형의 설정에 있어서나 추정방법의 개발, 추정량의 평가 등에 있어서 지속적인 연구노력이 요구된다.