영산호의 (榮山湖) 육수학적 (陸水學的) 연구 - Ⅰ. 하구에 새로이 형성된 호수의 일반적 그리고 물리적 환경에 대하여 -

최청일,정영호,위인선,백순기,이종빈,양수인 ( Chung Il Choi,Yung Ho Chung,In Sun Wui,Soon Ki Baik,Jong Bin Lee,Soo In Yang ) 한국하천호수학회 1985 생태와 환경 Vol.18 No.3·4

The limnology of Lake Yongsan, a freshwater reservoir recently built in the Yongsan Estuary, was studied in relation to physical conditions. The lake sampled for 14 months at monthly interval in 1983∼1984. Water temperature varied widely from a monthly average low of 1. 0℃ to a high of 30.7℃. Water structure was isothermal and homogeneous throughout the yearly survey. Salinity ranged from 0. 03 to 0.45‰ and tended to increase toward the barrier indicating some salt water intrusion. Extremely low transparencies prevailed throughout the survey period with Secchi disc depths ranging from 0. 25 to 1. 80 m. Conductivity was generally high with annual mean of 592.2 ㎛hos/cm while the annual mean pH range was 5.4∼9.4 with an annual average of 7. 2. The annual mean of alkalinity was 64.8 ㎎/ℓ. Dissolved oxygen content varied widely from 0. 90∼14. 44 ㎎/ℓ and had an annual mean of 8. 40 ㎎/ℓ. The BOD was relatively high, suggesting that allochthoncus organic material loading was occurring. The lake appears to be still in the early stages of development and has not yet reached equilibrium conditions. Other limnological factors are also described and discussed.

영산호의 (榮山湖) 육수학적 (陸水學的) 연구 - Ⅲ. 하구에 새로이 형성된 호수의 부유성유기탄소와 (浮遊性有機炭素) 질소 (窒素)의 분포에 대하여 -

최청일,정영호 ( Chung Il Choi,Yung Ho Chung ) 한국하천호수학회 1985 생태와 환경 Vol.18 No.3·4

Distribution of particulate organic carbon (POC) and nitrogen (PN) in newly formed Lake Yongsan in the Yongsan Estuary was studied during the period of June 1983 to Ju1y 1984. The POC range was 316∼10, 939㎍/ℓ with an annual mean of 1, 368㎍/ℓ and the PN range was 52∼2, 527㎍/ℓ with an annual mean of 286㎍/ℓ. The annual mean C/N ratio was 5. 2. Both POC and PN increased with increasing distance from the barrier suggesting the importance of organic matter supplied by the Yongsan River. Ignition loss from particulate matter (PM), a measure of total organic matter, was also higher in the two stations under the influence of Yongsan River. Quantitative relationship between ignition loss, POC and PN are discussed.

부유성 (浮遊性) 고형유기탄소 (固形有機炭素) 측정에 있어서 은제부막 (銀製溥膜) 휠타의 탄소공백치 결정에 관한 연구

최청일 ( Chung Il Choi ) 한국하천호수학회 1982 생태와 환경 Vol.15 No.3·4

The combustion of silver filter at 450℃ in the open air muffle furnace reduces the blank carbon of the filter to average of 13.5 μg of carbon with some consistancy. The blank carbon determination from deep sea samples was tested by regression analysis of different volume filtered. Precombustion of the filters can be a convenient practice prior to the measurement of particulate organic carbon in the field although the presence of absolute amount of the back ground carbon retained on the filter should be recognized particularly for the deep sea samples. Larger volume of filtration was suggested to minimize the blank carbon whenever possible.

교양교육에서 효과적인 팀 티칭(team teaching)의 구성 및 방법분석

최청일(Chung Il Choi ),황규홍(Kyu Hong Hwang) 한국지방교육경영학회 2002 지방교육경영 Vol.7 No.-

It appears that liberal arts education has become an important part of university education, constituting about 20 to :30% of the entire school curriculum. As liberal arts education gains more importance, however, many problems seem to arise and there is much room for improvements in all aspects of current liberal arts education. As a result, it seems necessary to satisfy students' need for liberal arts education, to improve the quality of the education, and to develop and try various teaching methods. Out of various methodologies that may help solve the problems, the most desirable appears to be team--teaching, a method in which professors specialized in different areas form a team and jointly teach a single liberal arts course Given this state of affairs. this paper investigates the reality of liberal arts education at the university level and explores the possibility of employing the team-teaching method in actual classes for a hetter liberal arts education. Based on research conducted and its analysis, it also makes the following suggestions. First. it is necessary to make great improvements in the contents and teaching methods of liberal arts education. Second, it is very effective to employ the team-teaching method in liberal arts education since this education, by nature, requires collaborative and interactive work. Third, the allotment learn-teaching method, in which faculty members are responsible for certain groups of students, should be employed more immediately in colleges of humanities, social sciences, arts, and physical education than in other colleges because those colleges offer a wide varicty of liberal arts courses and require many classes of small sizes. Fourth. the instruct.or-rotation team-teaching method, in which professors change classrooms and teach, should be introduced into any liberals arts courses which deal with unrelated topics or materials and have a collaborative and interactive nature Fifth, it seems good to employ the so -called student - rotation team teaching method, which requires students to change classrooms for lectures. in those liberal arts courses that frequently use various school facilities, equipment, and materials.

“세밀화로 보는 한반도 조류도감”에 대하여

최청일(Chung-il Choi) (서평자),이성미(Sung-Mi Lee) (서평자) 한국조류학회II 2006 한국조류학회지 Vol.13 No.1

영산호의 (榮山湖) 육수학적연구 (陸水學的硏究) : Ⅱ. 하구에 새로이 형성된 호수의 영양염류 및 식물플랑크톤 색소량의 분포와 기초생산성에 대하여

최청일 ( Chung Il Choi ) 한국하천호수학회 1988 생태와 환경 Vol.21 No.3

Lake Yongsan, a newly formed and shallow reservoir lake dammed in an estuary is characterized by variable nutrient and plant pigment contents and low primary productivity. During the survey period June 1983 to July 1984, phosphate concentration recorded variability of 0.15 to 1.23 mg/l with annual mean of 0.26 mg/l; nitrate content was in the range of 0.31 to 5.15 mg/ l with annual mean of 1. 79 mg/ l; ammonia content varied from 0.04 to 1.35 mg/ l with annual mean of 0.37 mg/ l. Chlorophyll a concentration ranged widely from 0.12 to 11.32 mg/m³ through the year with an annual mean of 2.19 mg/m³. Annual mean of plant carotenoid was 1.55 mg/m³. A relatively small quantity of primary productivity was measured as annual mean of 0.27 mgC/m³/hr. The general trend in spatial distribution of Chlorophyll a content and primary productivity was increasing with increasing distance from the river barrier.

울릉도 독도 근해에 분포하는 해산지각류 Evadne spinifera 의 생물학적 특성

김세화,최청일,유광일 ( Se Wha Kim,Chung Il Choi,Kwang Il Yoo ) 한국환경생물학회 1996 환경생물 : 환경생물학회지 Vol.14 No.2

Quantitative zooplankton samples were collected at nine stations in waters adjacent to Ullung Do and Tok Do Islands in the summer, 1995. Morphology and reproductive biology of a marine cladoceran Evadne spinifera were studied. Gross length of E. spinifera ranged 0.53∼1.14㎜, standard length; 0.20∼0.58㎜ and tail spine length; 0.07∼0.18㎜, respectively. Its fecundity in terms of the number of embryos per batch ranged 1∼7 (mean: 3.1) and sexual individuals were not observed.

동해안에서 자생하는 거머리말속 (Zostera Zosteraceae) 식물의 분포와 생육지 환경

이상용,권천중,최청일,LEE Sang Yong,KWON Chun Joong,CHOI Chung Il 한국수산과학회 2000 한국수산과학회지 Vol.33 No.6

한국산 거머리말속 중 동해 연안에 자생하는 식물의 분포와 생육지 환경의 특성을 파악하기 위해 1998년 6월부터 2000년 7월까지 중부 동해안의 화진포에서부터 남부 동해안 대변까지 조사하였다. 동해 연안에 자생하는 거머리말속은 거머리말, 왕거머리말과 포기거머리말 3종이 조사되었다. 거머리말 생육지는 기수호, 항과만의 수심 $1.3{\~}5.6 m$의 sand와 muddy sand 퇴적 환경에서, 왕거머리말은 수심 $8.5{\~}15.0 m$의 개방된 연안의 sand 퇴적 환경에서 출현하였다. 포기거머리말은 덕산항과 대변항에서 그 생육지가 처음 보고되었으며, 거머리말보다 깊은 지역에서 함께 생육하였다. 거머리말속의 식물 형태는 영양지와 생식지로 구분되었으며, 거머리말 영양지의 길이는 일산의 66.8cm에서부터 감포항의 110.0cm까지, 생식지의 길이는 화진포의 128.0cm에서부터 감포항의 277.8cm까지 생육 지역과 수심에 따라 다양하게 출현하였다. 왕거머리말은 영양지와 생식지가 $64.0{\~}75.7 cm$ 범위로 새로운 표현형으로 생육지의 수심에 영향을 받는 것으로 판단된다. 포기거머리말은 영양지와 생식지가 64.9{\~}70.3 cm$로 생식지가 좀더 길게 성장하였다. 영양염의 농도는 동해 남부 지역이 중부 지역보다 높게 나타났다. 동해안에서 자생하는 거머리말속 식물의 분포는 퇴적 환경보다는 종에 따라 생육 장소(만, 항구와 개방 연안 등)와 수심에 영향을 받고, 수심과 같은 생육 환경의 차이는 식물체의 형태 변이에 영향을 미치는 것으로 조사되었다. Distribution and habitat characteristics of Zostera (Zosteraceae) in the eastern coast of Korea were examined along with plant monohology, sediment composition and physicochemical factors of seawater from June 1998 to July 2000, The results showed that three species, Zostera marina, Z. asiatica and Z, caespitosa were found in specific habitats. The depth of habitat for Z. asiatica was deeper ($8.5{\~}15.0 m$) than that of Z. marina ($1.3{\~}5.6 m$) and Z. caespitosa ($3.2{\~}5.2 m$). Z. marina beds were observed at brackish-water, port and inner bay with the sediment type of sand or muddy sand. Habitats of Z. asiatica were restricted to the open bay with the sediment type of sand, Zostera have been described with regard to different growth forms of vegetation, flowering shoot and life history. Vegetation and flowering shoot length varied significantly with habitats; values ranged $66.8{\~}110.0 cm$ and $128.0{\~}217,8 cm$, respectively. Morphology of Z. marina varied with water depth and different substrates. Morphological characteristics of Z. asiatica showed a new phenotype at the deeper water depth. Vegetation and flowering shoots of Z. caespitosa were not significantly different between study sites (values ranged from 64.9 cm to 70.3 cm). Nutrient concentrations of seawater were higher at southern part than at middle part of the eastern coast of Korea. Distribution of Zostera in the eastern coast of Korea was dependent upon differences in water depth and habitat environments, by which affected the morphological differences were affected.

영산호의 (榮山湖) 동물플랑크톤 군집의 생태학적 연구

유광일,임병진,최청일 ( Kwang Il Yoo,Byung Jin Lim,Chung Il Choi ) 한국하천호수학회 1987 생태와 환경 Vol.20 No.2

N/A

담수산 (淡水産) 지각류 (枝角類) Moina irassa 의 생물학적 관찰

김세화,유광일,최청일 ( Se Wha Kim,Kwang Il Yoo,Chung Il CHoi ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.3

Preliminary observations on the biology of the freshwater cladoceran Monia irassa were carried out using the samples collected in the vicinity of Inchon City in Jun 20, 1992. A total of 208 specimens randomly sorted from the samples were measured for their body length(BL) and body width(BW). BL ranged 1.07-1.52mm(mean 1.29) and BW, 0.76-1.20(1.03). Embryonic development coincided with the increase of embryo length; stage I: sphere-shaped embryos just after being released from ovary(mean 0.26mm), II: embryos with deviloped embryonic appendages(0.39), III: embryos with well-developed antennae being identified by antennal spines(0.45). No peadogenetic reproduction was observed. Combined effects of embryonic growth and fecundity were positively correlated with BW( I : r^2=0.64, II: 0.42, III: 0.35, mean: 0.45), but not with BL. Fast increase in BW occurred in individuals with early embryos (stage I embryos: X coefficient of EL= 2.09) and expansion rate of brood pouch was gradually decreased with embryonic development (II: 0.67, III: 0.29). The number of embryos per batch ranged 4-25(mean 14.8) and more than 50% animals had 13-17 embryos. Decrease in the fecundity with embryonic development [stage I : 8-22 embryos (mean 16.1), II: 5-25 (15.7), III: 4-24 (14.5)] suggests the presence of prenatal mortality in the species.