한국산 빙어의 지리적 형태변이에 대하여

유봉석,이경로 한국수산학회 1981 한국수산과학회지 Vol.14 No.3

The authors made an investigation concerning the geographical distribution and some major differentiations in morphological characteristics associated with the each habitat, of the pond smelt, Hypomesus olidus, which was introduced into Korea more than 50 years ago. Major characteristics utilized for the comparison study were upper jaw (maxillary), number of fin rays, scale structure, vertebral count, number of pyloric caeca, number of gill rakers, and the relative measurements of these and other internal characters. 1. The main areas of natural distribution are Paro Lake. Soyang Lake, Han River, Euirim Lake, and Ogjeong Lake (or Unam Lake) and the tributaries of these waters. 2. Morphological variations varied when the mean values of measurements from each area were compared with the standard measurement value by mosaic comparison, and in some instances a significant variation was found. 3. The most significant variations were found in the number of fin rays of pectoral and anal fins; the lengths from the tip of snout to the origin pectoral fin, form snout to ventral fin, and form snout to anal fin, relative to standard body length; eye depth relative to head length; upper jaw; the number of pyloric caeca and the scale structure. Variations, on the other hand, be each habitat were no clear in the numbers of ventral and dorsal fin rays, gill rakers, vertebrae and lateral line scale; and the depth of caudal peduncle and distance from the tip of snout to the origin of dorsal fin relative to standard body length. 4. The scales of pond smelt showed some differences in the shape of scales, the shape and position of the focus and the number of ridges according to the scale positions on the body. No radii were present. The relations between longitudinal and transverse diameters of the scale suggest that the pond smelts of Soyang Lake and Un-am Lake are closely related, and those of Han River and Euirim Lake are also closely related. 5. The geographical variations in morphology of the pond smelt seem to have resulted from the variations in turbidity, water temperature, salinity (rater conductivity) and currents. 6. From the results obtained, it may be concluded that such factors as supramaxillary, relation between scale length and its breadth, number of caudal vertebrae and aye depth relative to head length may be used as the key characters for the classification of geographical varieties of pond smelt.

만경강산 (萬頃江産) 참게 부유유생인 Megalopa 에 관한 생태학적 연구

유봉석,김중래 ( Bong Suk Ryu,Choong Rae Kim ) 한국하천호수학회 1969 생태와 환경 Vol.2 No.3·4

At the point of view in the territorial speciality of the Man gyeong river, the appearance frequency of the megalopas of Eriochier sinensis has been observed during the time of May to August in 1969. 1. The megalopa begins to appear on 11th of May and has the prime of appearance from June 22nd to July 6th. The last stage of it is the middle of August. Mean while water temperature and specific gravity have little affection to the amount of appearance. 2. The highest amount of megalopa`s appearance is before and after two hours in the flood tide and the lowest reaches a marked decline in the ebb. 3. The rate of appearance shows 47.4% in the day time and 52.6% in the night time, so few difference is between day and night. 4. Most of megalopas are chiefly swimming in the upper layer. When the wave is severe and at night, some of them center about the middle or lower layer. But 60% and over has a contribution near the surface even in such a time.

의사결정 학습 모델 기반 교통카드 데이터 하차 정류장 추정 모델 연구

유봉석,추상호 한국ITS학회 2019 한국ITS학회논문지 Vol.18 No.6

교통카드 데이터는 다양한 대중교통 통계 지표 산출, 정책 및 평가를 위한 자료로 활용되어그 활용범위가 상당히 높다. 그러나 교통카드 데이터 내 주요 문제점은 하차 정류장에서 태그를 안 하고 하차하는 경우가 대부분으로 이는 교통카드 이용자의 불완전한 OD 통행 자료로활용범위에 있어 한계가 있다. 본 연구는 의사결정 모델 기반 교통카드 데이터 하차 정류장추정 방법을 적용한 결과 오차 범위 2개 정류장 이하에서 하차 정류장 추정 정확도는 89.7%으로 분석되었다. 이를 통하여 교통카드 데이터의 불완전성을 해소함으로써 다양한 대중교통 분석 및 평가 등에 대한 기초 자료로 활용 될 수 있을 것으로 판단된다. Smartcards are used as the basic data for utilizing the various transportation policies and evaluations, etc. and provided the transportation basic statistics index. However, the main problem of the smartcard data is that the most of users do not take the alighting tag at the stop, so there is a limit to the scope of use for the total O-D trip data because incomplete O-D traffic data of transportation card users. In this study, a decision tree of learning model is estimated for the alighting stop of smartcard users. The model estimation accuracy in range less than 2 stops interval was 89.7% on average. By eliminating the incompleteness alighting stop of smartcard data through this model, it is expected to be used as the basic data for various transportation analyses and evaluations.

참 우렁 Cipangopaludina malleata의 발생과 성장에 관하여

유봉석 군산대학교 1969 群山水産專門大學 硏究報告 Vol.3 No.2

The development and growth of Cipangopaludina malleata has been investigated five months during the period of Jun. to Dec, 1968. The results obtained are summerized as follows; 1.Cipangopaludina malleata was spawned at 23℃ the average water temperrature for on June to Dec. 2.There was 15 to 38 pieces in the foetalsac of this shell which seem to be a big egg(3.5mm) or larva style(2.8mm) 3.It took approximetely 15 to 20 grow from spawning to post larva(average W.T 23℃) 4.The larva of Cipangopaludina malleata has in average been measured as follows; Shell Length; 2,085mm. Width 2,695mm. Length of Aperture; 1,495mm, Width of Aperture; 1,845mm. 5.The post larva which was grown for five months has five times as large as that of the first.

秋季 熊川川의 河床型別 生物相에 關하여 : 魚類, 水生昆蟲 附着藻類

劉奉錫 군산대학교 1978 群山水産專門大學 硏究報告 Vol.12 No.2

1.An ecological survey of life bio Fauna of the stream bed in the UNG CHUN River in CHUNG NAM Who carried during the period of 8 days from Octover 8-15, 1977, at 60 stations as shown in Fig. 1. 2.The relation between the biomass of the stream bed in the UNG CHUN River and environmental factors is as follows. Pool : 26 places(Mean-Depth : 117cm, Verocity : 0.2m/sec. Pebbles : 19cm, Water Temperature : 18℃) Shallows : 20places(Mean-Depth : 35cm, Verocity : 0.43m/sec. Pebbles : 8.3cm, W. T : 18℃) Rapids : 14place(Mean Depth : 11cm, verocity : 0.63m/sec. Pebbles : 6.3cm, W, T : 18.6℃) 3.Existing Fish and water insects, adhere Algae on the stream bed in UNG CHUN River are as follows. adhere Algae of existing quentity : 5.1cc/25cm(Rapids : 44.4%. shallows : 34%. Pools : 21.6%) water insects of existing numbers : 6.8/2.5㎠(Rapids : 53.9%, shallows : 32.8%, Pools : 13.2%.) composing ratio of Fish Pool : 58.5%, shallow 31.2%, Rapid : 10.2%. 4.The author has collected life bio Fauna of Fish, water insects Algae of 4 species of adhere Algae which belong to 3 Oders, and 16 species of the water insects which belong to 5 Oders, 21species fish which belong 5 Oders. 5.The dominant species in all the stations as follows. Adhere Algae : Synedra ulna. Water insect : Epeorus laifolium Fish : Zacco platypus, Caraccius caraccius, Plecoglossus alitivelis. 6.The standing crops of Fishs of the 60 stations in the UNG CHUN River were shown in Table 5 and Fig 4.5.

錦江産 철갑상어의 비늘 特性에 관한硏究

劉奉錫,金鍾連,金容煥 군산대학교 1983 群山水産專門大學 硏究報告 Vol.17 No.3

The morphological characteristics of scales on Acipenser sinensis can be summarized as follows: 1.The form of scales on Acipenser sinensis caught in the Gum river can be classified form of Chrysanthemum, Frying wild goose, Butterfly, Fragment, Dog teeth scales. 2.The longitudinal diameter on the scales of the dorsal part and the lateral part is longer than the transverse diameter of it, but ventral part is contrary. 3.Half of the transverse diameter is divided by the tuber line and both of transverse diameter of dorsal scale are the same length. But above transverse diameters of lateral scales are longer than below length, and in the ventral scale below lengths are longer than above lengths. 4.Unappeared part of scale is not formed by a groove and ridge, form of a net work but appeared part is forms a network, a form of a same mind. 5.The scales having the largest diameter and the smollest diameter are appeared in front of the pectoral fin. 6.The average growth rate of all scales is rapid on anterior than posterior.

서해연안어장의 환경오염에 따른 대체수산자원 개발의 필요성과 대책

유봉석 한국수산과학회(구 한국수산학회) 1992 추계학술발표회 Vol.- No.-

한국산 짱뚱어 Boleophthalmus pectinirostris의 생태와 생활사

유봉석,김익수,최윤,RYU Bong-Suk,KIM Ik-Soo,CHOI Young 한국수산과학회 1995 한국수산과학회지 Vol.28 No.3

한국산 짱뚱어 Boleophthalmus Pectinirostris의 생태와 분포를 검토하기 위하여 1978년부터 1994년까지 우리나라 서남해 연안 17개 지점에서 표본을 채집하여 소화관 내용물, 초기발생, 체장조성, 그리고 저질, 수온, 염분, 서식공등의 서식환경과 분포지를 검토하였다. 전장 20mm 이상의 저서생활 단계에서 소화관 내용물은 대부분 규조류로서 식물성이었다. 산란기는 5월 하순부터 8원 중순이었고, 산란성기는 6월 중순에서 7월 하순으로 나타났다. 부화 직후 자어의 전장은 3.0-3.4mm로서 이 시기에는 유영생활을 하다가 전장 16mm에 이르면 저서생활을 시작하며, 부화 후 만 2년이 되면 성어로 성장하였다. 본 종은 간조시 평균 4-5시간 노출되는 조간대 연이질$(mud 96\%)$에 분포하는데, 이온이 $16^{\circ}C$ 이상을 유지하는 5월에서 11월까지 이면상에 나타나 활동을 하고, 나머지 기간은 휴지기로서 YL자형의 서식공내에서 동면하였다. 한편 서식공내의 염분은 거의 일정하게 $9-11\%o$를 유지하였다. 국내에서 짱뚱어의 분포지는 서해안과 남해서부 연안의 조간대에 제한 분포하였으나, 간척 매립 등의 생태계 변화로 서식지 및 서식 개체수가 현저히 감소되고 있는 추세이다. Ecology and life History of the mudskipper, Boieophthaimus pectinirostris were investigated based on the specimens collected from the Korean roasts from 1978 to 1994. The spawning of this species takes place during the period from June to August. Prolarva hatched from egg was 3.3mm in total length, and began to bottom life in TL 16.0mm of 40 days after hatching. The stomach contents were principally diatoms. In the foraging behavior, this species were conducted at the wet soft mud on the upper tidal zones. The burrowing observed in the intertidal mud flat was YL type. B. pectinirostris is restricted to western and southwestern coast of Korea, but their habitats and individuals are being reduced by the result of reclimation to tide land.

연안어장의 환경오염에 따른 대체수산자원개발의 필요성

유봉석 한국수산과학회 1992 추계학술발표회 Vol.- No.-

짱뚱어 , Bolephthalmus chinensis ( OBECK ) 및 근사종의 형태학적 비교연구

유봉석,김익수 한국어류학회 1989 韓國魚類學會誌 Vol.1 No.1