• ALGAE
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• 제28권4호
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• pp.297-305
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• 2013

There is increasing interest in the relationships between marine bacteria and red tide organisms. Some bacteria are known to kill red tide organisms, and may be responsible for accelerating the termination of red tides. Thus, certain algicidal bacteria have been proposed for the control of red tides. Meanwhile, many red tide organisms are known to feed on marine bacteria. The roles of marine bacteria and red tide organisms are therefore reversible. In Korean waters, the killing of red tide organisms by algicidal bacteria, and also the feeding of red tide organisms on marine bacteria have been extensively investigated. The findings of such studies may influence the conventional view of red tide dynamics, and also planktonic food webs. Here, we review the species and concentrations of algicidal bacteria that kill red tide organisms in Korean waters, as well as the ingestion rate and grazing impact of red tide organisms on marine bacteria. Furthermore, we offer an insight into the ecological roles of these 2 components in marine planktonic food webs.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2011년도 후기공동학술대회 논문집
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• pp.93-93
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• 2011

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2012년도 전기공동학술대회 논문집
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• pp.252-252
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• 2012

• 수산해양교육연구
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• 제25권2호
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• pp.526-537
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• 2013

The purpose of this study was to provide basic data needed for analyzing the factors needed for students' positive participation in physical education class and developing the leadership skills needed for effective class guidance by analyzing what relationship there exists between a physical education teacher-exercised transformational leadership and students' trust in physical education teachers and class satisfaction; thus, this study drew the conclusions as follows: First, in the relations between a physical education teacher-exercised transformational leadership and students' trust, it was found that a physical education teacher's charisma and intellectual stimulus had a positive influence on high school students. Second, it was found that a physical education teacher's charisma and individual consideration had a positive influence on a physical education teacher-exercised transformational leadership and the subordinate factor in class satisfaction-a sense of accomplishment while individual consideration and intellectual stimulus were found to have a positive influence on evaluation. Third, as for the trust in a physical education teacher and class satisfaction, the trust was found to have a positive influence on both a sense of accomplishment and evaluation.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
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• pp.323-324
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• 2002

This paper presents a preliminary study of the influence of roughness due to marine propeller blades machining on their performance. A blade surface finish that has been roughened by corrosion, cavitation and other phenomena, leads to a power penalty. Thus propellers manufacturers tend to propose blades of great surface finish, even mirror-polished. However achieving such surface finish increases manufacturing costs. With modem manufacturing means, propellers can now be machined while preserving a good surface finish. We have studied the influence of manufacturing strategy on an aspect of hydrodynamic performance, cavitation.

• 수산해양교육연구
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• 제25권3호
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• pp.616-624
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• 2013

This study is to figure out how parents' child-rearing attitudes perceived by elementary school students influence on the kids' self-efficacy and social development, so that desirable nurturing attitudes can be advised for parents for the better teaching kids at home. This research shows that parents' nurturing attitudes perceived by their kids influence meaningfully on the child's self-efficacy and social development. In particular, as the children see their parents focusing more on achievements, their self-efficacy is higher and they are more sociable. in other words, it is important and advised for parents to have achievement-oriented maturing attitude setting high goals and encouraging their kids to achieve them by working hard patiently.

• 수산해양교육연구
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• 제19권3호
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• pp.467-477
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• 2007

The purpose of this study was to investigate the influence of irrational beliefs on teacher burnout. Four-hundred twenty-two school teachers participated in this study. Maslach Burnout Inventory and Irrational Belief Test were used to collect data. Collected data were analyzed using stepwise multiple regression. Irrational beliefs significantly predicted teacher burnout. High self-expectation, helplessness, problem avoidance, anxious over-concern and frustration reactivity were significant predictors of teacher burnout. Influence of irrational beliefs on teacher burnout differed according to stages of teacher development and school grade of teacher. The implications of this study on education and counseling for teacher were discussed. Finally future research questions were recommended with the limitations of this study.

• Journal of Advanced Marine Engineering and Technology
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• 제20권2호
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• pp.108-108
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• 1996

This paper describes a new approach to solve balancing of a rigid rotor. In this paper, the balancing of the rigid rotor using genetic algorithms, which are search algorithms based on the mechanics of natural selection and natural genetics is proposed. Under the assumption that the initial vibration values used to calculate correction masses contain errors, the influence coefficient method, the least squares method and a genetic algorithm are compared. The results show that the vibration amplitude obtained with the least squares method and the genetic algorithm is smaller than that obtained with the influence coefficient method.

• Journal of Advanced Marine Engineering and Technology
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• 제20권2호
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• pp.40-47
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• 1996

This paper describes a new approach to solve balancing of a rigid rotor. In this paper, the balancing of the rigid rotor using genetic algorithms, which are search algorithms based on the mechanics of natural selection and natural genetics is proposed. Under the assumption that the initial vibration values used to calculate correction masses contain errors, the influence coefficient method, the least squares method and a genetic algorithm are compared. The results show that the vibration amplitude obtained with the least squares method and the genetic algorithm is smaller than that obtained with the influence coefficient method.

• Journal of Advanced Marine Engineering and Technology
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• 제22권4호
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• pp.451-459
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• 1998

THe influence of internal acoustic exitation through a square prism on the turbulent wake flow characteristics was investigated. The intermediate wake region where is about ten times the respective length of the body was experimentally investigated using a conditional phase average technique. At first the static base pressures of square prism and the shedding frequencies have been measured at various internal acoustic exciation frequencies. The experiment were performed under the four cases of internal acoustic excitation frequencies 0Hz 30Hz($St_e$=0.09) 65Hz($St_e$=0.20) 120Hz($St_e$=0.38) And velocity vector fields were presented and discussed. The influence of acoustic exvitation frequencies on the structure of intermediate turbulent wake region is evident. As the internal acoustic frequency increased shedding frequency gradually increased and aerodynamic force decreased. Also it was found that the vortex shedding occurs dratically well and shedding frequency reached nearly the same value as the internal acoustic frequency. but above Strouhal number 0.3 the influence disappeared.