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      • The fine Structure of the Marine Epizoic Pennate Diatom Pseudohimantidium pacificum in Korean coastal Waters

        이진환,이진이,김미옥,LEE, JIN HWAN,LEE, JIN YI,KIM, MI OCK The Korean Society of Oceanography 1993 韓國海洋學會誌 Vol.28 No.3

        해양 부착상 규조류 pseudohimantidium pacificum에 관하여 주사전자현미경 및 광 학현미경을 통한 미세구조, 형태적 변이와 지리적 분포를 연구하였다. 세포의 정축과 횡축의 길이는 기왕의 보고와 유사하였으나 순상돌기의 수는 이보다 2~3개 더 많아 변이가 뚜렸하였다. 조선(striae)의 수도 기보고와 비슷하였고, 이의 모양은 현재까지 둥근형으로 보고되어 있으나 본 연구에서는 긴타원형이었다. 한편 본 규조류는 부유생 활을 할 뿐 아니라 동물부유생물 중 요각류 Corycaeus affinis의 흉각과 두부의 촉각 주변에 많이 부착하고 있었다. 본종이 한국의 남서해역에서 분포하고 있음을 확인하였 던 사실은 이 종이 북태평양의 황해에 37$^{\circ}$30'N까지 분포함을 말해준다. SEM and LM studies were made to examine the frustule of the marine epizoic diatom Pseudohimantidium pacificum Hustedt & Krasske and to examine the variability of frustule morphology. The length of the apical axis and the transapical axis were similar to other reports. but Number of labiate processes showed a variation. the Number of striae of Korean specimens were similar to those of other regions, but the areolae shape of striae showed elliptical type. Pseudohimantidium pacificum were palnktonic, tychopelagic or epizoic attached to the prosome, the genital segment and abdomen of corycaeus affinis. this species was newly recorded I Korean waters and the biogeographic boundary of this species can therefore be extended to the northern Pacific Ocean.

      • KCI등재

        F<sub>0</sub>값 수준을 달리한 삼계탕의 실온 저장 중 물리화학적 및 관능학적 특성

        이진환,이진호,이근택,Lee, Jin Hwan,Lee, Jin Ho,Lee, Keun Taik 한국식품저장유통학회 2014 한국식품저장유통학회지 Vol.21 No.4

        Changes in various physicochemical and sensory characteristics of Samgyetang retorted at the $F_0$ values of 4.0 (F4), 7.0 (F7), and 10.0 (F10) were investigated during storage at $25^{\circ}C$ for 12 months. The pH level tended to decrease in all the treatments with the increase of the storage time, but no significant difference in the extent of the decrease was observed among the treatments. The values of volatile basic nitrogen, thiobarbituric reactive substances, and carbonyl contents increased rapidly over the storage period in the order of F4 > F7 > F10. The viscosity decreased most sharply between month 0 and month 2, after which the rate of increase declined. The oxygen concentration in the headspace of the retort pouch of the Samgyetang was higher for the samples retorted at higher $F_0$ values. In the sensory tests, the scores of the samples retorted at higher $F_0$ values tended to be lower, but all the characteristics of the samples, except for the texture of the T10 samples, were evaluated with scores higher than 5.0, the limit of marketability, over the storage time. In conclusion, the quality of the Samgyetang samples treated at higher $F_0$ values deteriorated more noticeably during storage. 본 연구는 레토르트 삼계탕을 멸균 조건을 달리하여 실온 저장하면서 물리화학적 또는 관능학적 변화를 관찰하고 적정 가열 처리 조건을 파악하기 위해 실시하였다. $F_0$값을 4, 7과 10으로 각각 달리하여 레토르트 삼계탕을 제조한 후 $25^{\circ}C$에서 12개월 동안 저장하며 물리화학적 품질 변화를 비교하였다. 저장기간 중 삼계탕의 pH는 저장기간에 따라 감소하는 경향을 나타낸 반면, VBN, 카보닐, TBARS, 점도, 경도 값과 산소 농도 비율은 $F_0$값 수준이 높아질수록 증가하는 경향을 보였다. 관능검사 결과 F10 처리구의 12개월 후 조직감 항목을 제외한 모든 시료들에서 상품성 한계치인 5.0 이상으로 평가되었다. 종합적으로 $F_0$값 수준이 높을수록 제조 직후 및 저장 과정 중 레토르트 삼계탕의 품질열화 정도가 심하다는 것을 확인할 수 있었다. 따라서 삼계탕의 저장 중 품질 저하를 줄이고 안전성을 보장하는 적정 멸균 조건으로 제품을 생산하기 위한 기술개발이 필요할 것으로 사료된다.

      • KCI등재

        The Water Quality and the Phytoplankton Communities in the Dong River of Kangwon Province, Korea

        이진환,Lee, Jin-Hwan The Korean Society of Phycology 2004 ALGAE Vol.19 No.3

        The present study is to examine the water quality and to analyze the plank tonic and benthic phytoplankton communities at 6 stations in the Dong River and its tributary streams of Kangwon Province from November, 2001 to March, 2002. During the studies, water temperature ranged from 3.5 to 12.8℃; pH, 6.5-7.9; DO, 9.29-11.36 mg·l^(-1); BOD_5, 0.20-2.38 mg·l^(-1); TN, 1.2842-3.1871 mg·l^(-1); TP, 0.0052-0.0576 mg·l^(-1); and SS, 0.85-9.62 mg·l^(-1). The standard of water quality according to the Korean Environmental Preservation Law showed the first class except St. 6 through the survey. Six taxa of plank tonic phytoplankton identified were poor flora in November, 2001. The representative species frequently observed were the diatoms Achnanthes lanceolata, Achnanthes minutissima, Cymbella minuta, Cymbella parva, Diatoma vulgare, Fragilaria construens, Gomphonema pervulum, Navicula cryptocephala, Nitzschia palea., Scenedesmus sp. of green algae and Stephanodiscus hantzschii. Monthly dominant species of phytoplankton were Achnanthes lanceolata and A. minutissima in both February and March, 2002, but the blue-green algae, Oscillatoria sp. and the diatom, Stephan discus hantzschii were predominant at some stations in March. Phytoplankton standing crops ranged from 9.84 ${\times}$ 10$^3$ to 3.56 ${\times}$ 10$^4$ cell·l$^{-1}$ in November and 1.68-2.99 ${\times}$ 10$^5$ cell·l$^{-1}$ in February, while it changed 4.52-8.01 ${\times}$ 10$^5$ cell·l$^{-1}$ at St. 1, 2, 3 and 1.03-1.71 ${\times}$ 10$^6$ cell·l$^{-1}$ at St. 4, 5, 6 in March. Benthic phytoplankton communities was composed of 38 taxa in November, 31 taxa in February and 23 taxa in March. It showed a contrary tendency to planktonic phytoplankton diversity. Benthic diatoms which were more than 25% of the total populations were Cymbella turgida, Diatoma vulgare, Cocconeis placentula, Navicula cryptocephala var. intermedia in November; Achnanthe lanceolata, Cocconeis placentula, Achnanthes minutissima in February; and Achnanthes lanceolata and Cyclotella meneghiniana in March.

      • KCI등재

        한강하류의 환경학적 연구 -VII. 식물플랑크톤군집의 장기간 변화와 전망-

        이진환,정승원,Lee, Jin-Hwan,Jung, Seung-Won 한국조류학회(藻類) 2004 ALGAE Vol.19 No.4

        The literature review on the dynamics of the phytoplankton communities in terms of species composition, standing crops, abundant species and dominant species in the lower part of the Han River from 1940s to 2000s was conducted for the prospective prediction of their succession patterns. Total of 326 taxa were identified and they belonged to 47 blue-green algae, 139 green algae, 12 euglenoids, 126 diatoms, 6 din flagellates and 2 silicoflagellates. Composition of phytoplankton communities were 83.6% diatoms, 10.5% blue-green algae and 5.3% green algae in the middle of 1960s, whereas those were 43.2% diatoms, 40.7% green algae and 13.6% blue-green algae in the 1990s. Before 1990s, Synedra ulna, Melosira varians, Cymbella tumida, Synedra acus, Cymbella ventricosa, Navicula cryptocephala, Nitzschia palea, Aulacoseira granulata, Gomphonema parvulum and Cymbella affinis were most frequent, while those after 1990 were Asterionella formosa, Asterionella gracillima, Aulacoseira granulate, Aulacoseira granulata var. angustissima, Chlorella vulgare, Fragilaria crotonensis and Synedra ulna. Phytoplankton blooms were frequent from winter to the late spring and rare in summer due to heavy rain and discharge. Seasonal variations of the dominant species were fairly obvious; Asterionella gracillima and Aulacoseira granulata in spring, Aulacoseira granulate and Aulacoseira granulate var. angustissima in summer and autumn, Asterionella gracillima and Stephan discus hantzschii in winter. Recently blue-green algae, Microcystis, Aphanocapsa, Dactylococcopsis have been more abundant than those of the previous reports. Based on the current situations, Stephan discus hantzschii f. tennis, Asterionella gracillima, Aulacoseira granulate and blue-green algae will be more abundant and blooms of those species will be more frequent.

      • KCI등재

        Alkaloids from the Stem Bark of Phellodendron amurense Rupr

        이진환,이병원,강남숙,문여황,양민석,박기훈,Lee Jin Hwan,Lee Byong Won,Kang Nam Suk,Moon Yea Hwang,Yang Min Suk,Park Ki Hun Korean Society of Life Science 2005 생명과학회지 Vol.15 No.3

        Two isoquinolines and one quinolone were isolated from the stem bark of Pellodendron amurense Rupr. (Rutaceae). Two isoquinolines were elucidated as thalifoline (2) and pharmacological active berberine (3) has been blocking the release of $Ca^{2+}$ from internal stores. One quinolone was identified as N-methylatanine (1). This is the first report on the isolation of N-methylatanine (1) and thalifoline (2) from this plant. 운향과(Rutaceae)인 황백나무(Phellodendron nmurense Rupr.)의 줄기 점 질에서 2종의 isoquinoline 화합물과 1종의 quinolone 화합물을 분리하였다. Isoquinoline 화합물은 thalifoline (2)과 칼슘 방출을 저해하여 혈압조절에 관여하는 berberine (3)으로 구조동정 되었다. 또한 quinolone 화합물은 N-methylatanine (1)로 구조동정 되었다. 이들의 화합물 중에서 N-methylatanine (1)과 thalifoline (2)는 황백나무에서 처음으로 분리하였다.

      • KCI등재

        우리나라 황해의 해산 돌말류 Ditylum brightwellii (West) Grunow의 형태학적 특징에 의한 두 유형

        이진환,윤석제,Lee, Jin-Hwan,Youn, Seok-Jea 한국조류학회(藻類) 2007 ALGAE Vol.22 No.4

        This study deals with the taxonomy of the marine diatom Ditylum brightwellii (West) Grunow: shape, size and ratio, marginal ridge, labiate process, areolation, and seasonal distribution are all considered. Ditylum brightwellii were divided into two type; prism- and cylinder-shaped. Comparisons between specimens from the Yellow Sea were made on, (1) shape- prism types are prismatic-shaped and/or regular square or right-angled tetragon, cylinder types are cylinder-shaped and/or long right-angled tetragon in the girdle view, respectively; (2) size and ratiodiameters of prism types are 82.1 ± 2 μm, while those of cylinder types are 21.2 ± 5 μm and ratio of pervalvar axis/diameter- prism types cells are 1.0-1.5, but cylinder types are 3.9-5.5; (3) marginal ridges- prism types have dotted, while those of the cylinder-type cells have piece, slotted or fimbriated on the marginal ridge; (4) labiate process- both prism- and cylinder-types are central part in valve face, but length of labiate processes of prism types are longer than those of cylinder types; (5) cell margin- the girdle margin show many shallow furrows in prism type and smooth in cylinder type; (6) areolation- both prism- and cylinder-types are a radial pattern in the valve center, but areolae of prism types are larger than those of cylinder types; (7) seasonal distribution- cylinder types are dominated in summer and prism types in the other seasons.

      • KCI등재후보

        6-시그마 기법을 이용한 고속자동피치가변장치 메커니즘 설계

        이진환,원윤재,이혁,Lee, Jin-Hwan,Won, Yun-Jae,Lee, Hyuk 한국반도체디스플레이기술학회 2008 반도체디스플레이기술학회지 Vol.7 No.4

        A high speed automated pitch variation unit (HAPU) related to semiconductor category sorting movement of the test handler system was developed. In the design process, 'DMADOV' step of 6-Sigma method has been applied. The design result for the desirable pitch variation was a 3:1 reduction rack-pinion and a linkage which are operated by servomotors. The realization and reliability of the mechanism was obtained at the design stage by FEM analysis, and by robust design using Taguchi orthogonal array against weight and deformation. Finally, the validity of the high speed variation mechanism was confirmed via inspection using a high speed camera while performing pitch variation.

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