간행물
수산해양기술연구 KCI 등재 Journal of the Korean Society of Fisheries and Ocean Technology 韓國漁業技術學會誌
- 발행기관 한국수산해양기술학회(구 한국어업기술학회)
- 자료유형 학술지
- 간기 계간
- ISSN 2671-9940 (Print)2671-9924 (Online)
- 수록기간 1965 ~ 2024
- 주제분류 농수해양 > 수산학 농수해양 분류의 다른 간행물
- 십진분류KDC 529DDC 639
권호리스트/논문검색
권호
17권 1호 (1981년 3월) 6건
1.
1981.03
구독 인증기관 무료, 개인회원 유료
The selective response of the sea bass, Lateolabrax japonieus and the gray rock cod, Sebastes inermis to the colored twines was studied in a white tiled aquarium C400LX60WX70H em), by use of Y -maze made of gray plastic plate. Anyone of the different colored twines, white, black, blue, yellow and red, was strung crosswise on a rectangular frame which was mounted to one of the two outlet ends of Y -maze, and another colored twine was used to the other end of the Y -maze. In each trial, a fish was guided toward the inlet of the Y -maze to let the fish select either one of the two different colored twines. The results obtained are aS follows: 1. Sea bass preferably selected the colored twines in a order of white, blue, yellow, black and red with significant difference. 2. Gray rock cod showed little difference in selecting colored twines even though the fish selected white one a little more frequently.
4,000원
2.
1981.03
구독 인증기관 무료, 개인회원 유료
The author carried out an experiment to find out the responsing patterns of filefish, Stepha nolepis cirrhifer (Temminck et Schlegel) to the color lights. The experimental tank (360LX50WX55H cm) was set up in a dark room. Six Longitudinal sections each being 60 em intervals are marked in the tank to observe the location of the fish. Water depth in the tank was kept 50 em level. Light bulbs of 20W were placed at the both ends of the tank to be projected the light horizontally into the tank. Two different colored filters were selected in combination from four' colors-red, blue, yellow, and white, and were placed in front of the light bulbs to make\ulcorner different light of color. Light intensity were controlled by use of auxiliary filters intercepted between the bulb and the filter. The fish were acclimatized in the dark for 40 minutes prior to employ in the experiment. Upon turning on the light, the number of fish in each section was counted 40 times in every 30 seconds, and the mean of the number of fish in each section was given as the gathering rate of the fish. The results obtained are as follows: 1. Color of light, to which the fish gathered abundantly was found in the named order of blue, white, green, and red. 2. The differences of gathering rate upon arbitary combined two color lights were shown significant, and the differences increased remarkably in accordance with the lapse of illuminating period.
4,000원
3.
1981.03
구독 인증기관 무료, 개인회원 유료
한국국적을 가진 일반화물선 30척과 원목운반선 15척의 외판부식도를 선령별로 조사한 결과는 다음과 같다. 1. 일반화물선 1) 전평균부식도는 어느 선령급에서나 경흘수선부가 가장 크다. 2) 선수미방향의 전평균부식도는 어느 선령급에서나 선수부가 중앙부나 선미부보다 크나, 큰 차이는 없다. 3) 깊이 방향의 부식도는 선령 16년 이하에서 건현부, 만재흘수선부, 하부만곡부, 경흘수선부의 순으로 크다. 또 35년에 있어 부식도는 경흘수선부와 만재흘수선부는 건현중앙부에 약 3배, 상부만곡부는 그것의 약 2배 되어 수선부가 가장 부식이 심함을 나타낸다. 2. 원목운반선 1) 전평균부식도는 어느 선령급에서나 상부만곡부가 가장 크다. 2) 선수미방향의 부식도는 어느 선령급에서나 선수부가 가장 크나, 큰 차이는 없다. 3) 깊이 방향의 부식도는 어느 선령급에서나 건현부가 가장 작고, 상부만곡부가 가장 커서 그 부식도는 건현부의 약 2배가 된다. 3. 일반화물선과 원목운반선. 원목운반선의 부식도의 전평균은 일반화물선의 그것의 약 3배나 된다.
4,000원
4.
1981.03
구독 인증기관 무료, 개인회원 유료
Accuracy of the position fix obtained by navigation with Omega in the capacity of worldwide navigation depends on the predicted propagation correction. The authors observe continuously the phase differences of the A-C pair and the A-E pair from April 17 to October 14, 1980, at Busan(35\ulcorner07'. 9N, 129\ulcorner06'. 3E), and analyze the characteristic of daily variation the relation between the theoretical PPC and the measu red PPC to study the accuracy of the position fix. The results are as follows: 1. The results of fourier's analysis for the theoretical PPC and the measured PPC are positive correlation in the coefficients ao, a2, a3 with A-C pair and in the coefficients aO-a3 with A-E pair, and those PPC are apparent to daily periodicity during all measured time. The initial phase is around to 280\ulcorner with A-C pair and 1800 with A-E pair. 2. Daily variatons of the phase difference tend to decrease and the time width to narrow from April toward July, but these variations are opposed to those from July toward October. 3. Mean value of total errors of the position fix by theoretical PPC is 2.67 miles and its standard deviationis O.90miles. 4. Mean value of total errors of the position fix by the measured PPC is 0.63 miles and its standard deviation is 0.217 miles.
4,000원
5.
1981.03
구독 인증기관 무료, 개인회원 유료
More recently, unsteady flow in small-diameter pipes plays a major role in liquid propellantrocket systems, hydraulic and pneumatic control system, and elsewhere. And it has shown that line dynamics can have a marked effect on the hydraulic system characteristics. In this paper, transfer function of hydraulic lines with an accumulator and an outlet orifice is' developed and compared with experimental data from frequency response tests at various airvolume(V.) and the location of accumulator(ld1t), so that their performance may be correctly and easily predicted and the design of the systems incorporating them improved. The obtained results are as follows: 1. The dynamic response of hydraulic lines may be analyzed more accurately by use of the viscous term(22) in unsteady laminar flow. 2. There was good agreement between the theoretical and experimental results of this investigation, and hydraulic systems with liines included an accumulator can be analyzed more accurately by use of the pressure transfer function given by eq. (16). 3. For the mitigation of surge in hydraulic lines, it is more effective that the location ofaccumulator is close to the pipe outlet side. 4. According to the gas volume of accumulator is increased(the sealing pressure is close tomean line pressure), the damping effect of pressure wave is improved.
4,000원
