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장성현,이정훈,이정호,Jang, Sung-Hyun,Lee, Jung-Hoon,Lee, Jung-Ho 한국조류학회(藻類) 2006 ALGAE Vol.21 No.3
The purpose of the study is to understand the ecological characteristics of the early stage of community formation of epilithic diatoms. The samples were daily collected from a site of the Kumho River during 70 days from October 13 to December 21 in 2002. Total 126 diatom taxa collected in the study were classified into 114 species and 12 varieties belonging to 26 genera. About 80% of the taxa collected from the artificial substrata during the whole studying period were observed until tenth day from the start time of the study. In the study the successional process of the diatom community was divided into the three stages of the early, the middle and the later by cluster analysis based on the similarities in species composition among the communities. Cocconeis placentula Ehrenb. and C. placentula var. lineata (Ehrenb.) V.H., horizontally positioned species, would be divided into the early successional species, and Diatoma vulgre Bory, vertically positioned species, was the later successional species. Cell densities and species composition of the diatoms on the artificial substrata were closely similar to them of natural substrata after 40th day from the start time of the study.
섬진강 중,상류 수계에서 붕어 개체군의 생태학적 특성치 추정
장성현 ( Sung Hyun Jang ),류희성 ( Hui Seong Ryu ),이정호 ( Jung Ho Lee ) 한국환경생태학회 2011 한국환경생태학회지 Vol.25 No.3
섬진강 중·상류 수계에서 붕어의 자원량 및 자원관리의 기초로 사용되는 붕어의 개체군 생태학적 특성치를 추정하고자 하였다. 채집된 붕어의 전장은 95-288㎜의 범위를 보였으며, 연령은 비늘의 윤문을 통해 결정하였다. 연령형질로서 비늘은 윤문이 뚜렷하게 구분되었으며, 이를 통해 확인된 최고 연령어는 5세로 나타났다. 전체 표본에서 2세 연령어가 가장 많은 양을 차지하였으며(n=38), 다음으로는 3세 연령어가 풍부하였다(n=22). 연변수지수 분석을 통해 매년 단일윤문이 형성됨이 확인되었다. 체장과 체중 간의 관계식은 BW = 0.0038BL3.73(R2=0.96) (p<0.01)로 추정되었고, 인경과체장 간의 관계식은 BL = 2.362R+2.76(R2=0.89)로 나타났다. 비선형 회귀분석을 통해 추정된 von Bertalanffy 성장 파라미터들은 이론적 최대체장 33.2㎝이었으며, 이론적 최대체중 1,798.4g, 성장계수 0.20년-1, 체장이 0일 때의 연령-0.51년 등으로 추정되었다. von Bertalanffy에 의한 붕어의 성장식은 Lt = 33.23(1-e-0.20(t+0.51))(R2=0.98)로 확인되었다. 연간 생존율은 0.427년-1로, 순간자연사망계수는 0.784년-1로 추정되었으며, 순간어획사망계수는 0.067년-1로 산출되었다. 생존율로부터 추정된 순간전사망계수는 0.851년-1로 추정되었다. The population ecological characteristics of the Crucian carp, Carassius auratus, were determined in order to estimate stock of the mid-upper system of the Seomjin River. The fish ranged in size from 95 to 288㎜total length. The age was determined by counting the scale annulus. The scales displayed clear annulus that were used to estimate the age. The oldest fish observed in this study was 5 years old. Age-2 fishes were the most numerous in the sample(n=38), followed in frequency be age-3(n=22). Marginal index analysis validated the formation of a single annulus per year. The relationship between body length and body weight was BW = 0.0038BL3.73(R2=0.96) (p<0.01). The relationship between the scale radius and body length was BL = 2.362R+2.76(R2=0.89). The von Bertalanffy growth parameters estimated from a non-linear regression method were L∞=33.2 ㎝, W∞=1,798.4 g, K=0.20year-1 and t0=-0.51year. Therefore, Growth in length of the fish was expressed by the von Bertalanffy`s growth equation as Lt = 33.23(1-e-0.20(t+0.51))(R2=0.98). The annual survival rate was estimated to be 0.427year-1. The instantaneous coefficient of natural mortality of estimated from the Zhang and Megrey method was 0.784year-1, and instantaneous coefficient of fishing mortality was calculated 0.067year-1. From the estimates of survival rate, the instantaneous coefficient of total mortality was estimated to be 0.851year-1.
장성현(Sung Hyun Jang),최영휴(Young Hyu Choi),김수태(Soo Tae Kim),안호상(Ho Sang An),최학봉(Hag Bong Choi),홍종승(Jong Seung Hong) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.2
In this study, three types of large scale multi-tasking machine tools together with core technologies involved have been developed and introduced; a multi-tasking machine tool for large scale marine engine crankshafts, a multi-tasking vertical lathe for windmill parts, and a large scale 5-axis machine tool of gantry type. Several special purpose devices has been necessarily developed for the purpose of handling and machining big and heavy workpieces accurately, such as PTD (Pin Turning Device) with revolving ring spindle for machining eccentric crankshaft pins, hydrostatic rotary table and steady rest for supporting and resting heavy workpieces, and 2-axis automatic swiveling head for high-quality free surface machining. Core technologies have been also developed and adopted on their detail design stage; 1) structural design optimization with FEM structural analysis, 2) theoretical hydrostatic analysis for the PTD and rotary table bearings, 3) box-in-box type cross-rail and octagonal ram design to secure machine rigidity and accuracy, 4) constant spindle rpm control against gravitational torque due to unbalanced workpiece.