• Journal of Bio-Environment Control
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• v.19 no.1
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• pp.12-18
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• 2010

Irrigation management methods controlled by integrated solar radiation (ISR) or drainage level sensor were evaluated in rockwool or coir bag culture as tomato (Solanum lycopersicum L.) production system. Substrate water content and drainage percentage were more stable in the drainage level sensor method than in the ISR method regardless of substrate type. Total yield and marketable yield were high in the drainage level sensor method, but not between substrates in the same irrigation management method. Sugar content was affected more by the substrate type than irrigation method. The drainage level sensor method was elucidated to be better than the ISR method regardless of substrate type.

• Journal of agriculture & life science
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• v.44 no.6
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• pp.23-26
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• 2010

Commercial fibers such as two kinds of micro-fiber, flannel, and cotton were analyzed for their nutrient solution absorption capacity to select hydrophilic mat used for the irrigation management by drainage level sensor in perlite bag culture. The selected mat was evaluated in terms of absorption capacity. Cotton had the highest absorption capacity and was revealed to be the most appropriate for the control system.

• Journal of Bio-Environment Control
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• v.19 no.1
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• pp.19-24
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• 2010

The experiment was implemented to introduce the drainage electrode irrigation system as early as possible after transplanting in order to save the nutrient solution in a convenient way. Drainage electrode irrigation method was introduced 15, 19 or 22 days after transplanting after irrigation was firstly controlled by time clock. Time clock method was also treated as a control plot. Drainage electrode method could be adopted from 15 days after transplanting, 15 days earlier than the present introducing time. The growth and yield was better in treatments with drainage electrode method. Water and fertilizer use efficiency were the highest in the treatment of 15 days, the lowest in time clock treatment.

• Journal of the Korean Society of Marine Environment & Safety
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• v.25 no.5
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• pp.535-541
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• 2019

The purpose of this study was to investigate the possibility of fishery in offshore wind farms and evaluate the risk linked to the presence of turbines and submarine cables in these areas. With this objective, we studied an offshore wind farm in the Southwest Sea and the current state of vessels in the surrounding National Fishing Port. The risk assessment criteria for 22 fishing gears and methods were set by referring to the fishing boats; thereafter, the risk was assessed by experts. The fishing gears and methods that could be safely operated (i.e., associated with low risk) in the offshore wind farm were: single-line fishing, jigging, and the anchovy lift net. The risk was normal so that it is possible to operate, but the fishing gears and methods that need attention are: the set long line, drifting long line, troll line, squid rip hook, octopus pot, webfoot octopus pot, coastal fish pot, stow net on stake, winged stow net, stationary gill net, and drift gill net. Moreover, the fishing gears and methods difficult to operate in the of shore wind farm (i.e., associated with high risk) were: the dredge, beam trawl, and purse seine. Finally, those associated with very high risk and that should not be allowed in offshore wind farms were: the stow net, anchovy drag net, otter trawl, Danish seine, and bottom pair trawl.

• Journal of Advanced Marine Engineering and Technology
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• v.22 no.3
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• pp.311-319
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• 1998

DC Motors have been widely used in industry as driving power motors for electrical vehicles cranes and winches due to their strong starting torques and as servo-motors for position and speed control systems due to their convenience of speed control etc. Generally in the speed control systems of motors speed sensors are required and this fact results in he increased price and operating cost and in the limitted applications. This paper presents a new speed control method for sensorless DC motors. In this scheme the speed signal is estimatd by the measurement values of the armature voltage and current. A Fuzzy feedback controller instead of the conventional PID controller. Through simulations the effectiveness and usefullness of the proposed method are illustrated.

• Journal of Korea Entertainment Industry Association
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• v.13 no.7
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• pp.247-259
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• 2019

This study aims to develop Korean film music by using Korean traditional music with proper technique. As of 2019, current Korean film music is mostly modeled after Western music. The usage of traditional music instruments is significantly lower than the usage of western instruments and is merely used in Korean historical movies as embedded music. This supports the many views that Korean traditional music seems too difficult to appeal to the general audience in these modern times. Furthermore, there aren't any such cases to apply traditional music techniques to western instruments whereas there have been many occasions where traditional music instruments imitate western instruments with its tones. The suspected reason for this is due to the lack of proper understanding and techniques of traditional music that Korean film composers have utilized, and its limited exposure in popular music. However, traditions are special and unique way to represent the history, culture, lifestyle and characteristic of countries. Therefore, it is our duty to protect our own traditions. As both a Korean, and as a musician, new film music is needed which uses traditional music instruments and its techniques. When film composers create music with better understanding of Korean traditional music, this unique music will be able to transcend borders and spread throughout the world.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.114-114
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• 2018

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.10a
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• pp.31-32
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• 2002

통발어업은 일정한 장소에 서식하거나, 유영력이 크지 않으면서 미끼에 대한 반응이 민감한 생물을 미끼로써 함정으로 유인하여 잡는 어법으로서, 어구의 구조가 비교적 간단하고 조업이 용이할 뿐만 아니라 어획효과도 좋으며, 어획물이 대부분 활어 상태로 판매할 수 있어서 수익성도 높으므로 연안어업에서 중요한 위치를 차지하고 있다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.70-71
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• 2003

승망은 어군을 적극적으로 쫓아서 어획하는 적극적 어법의 어구가 아니라, 연안으로 래유한 어군을 어구로 유도하여 어획하는 소극적인 어법의 어구이기 때문에 일반적으로 지역적인 환경의 영향을 많이 받는 어업이다. 따라서, 대상 어장에서 래유 어군의 어도를 파악하여 어군이 쉽게 어구에 접근하도록 어구를 설치하여야 하며, 어구에 대한 각 어종의 행동 등을 파악하여 어획능률을 향상시켜야 한다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.57-58
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• 2001

최근 우리나라는 연근해 어업에 대한 환경변화가 심화되면서 어로작업의 생력화 및 지역특성에 알맞은 어구어법개발이 필요시 되고 있는데 제주도의 경우 주변국가와의 어업협정 이후 어장축소 등으로 말미암아 종래의 어선어업이 위축되면서 따라 연안 유용수산자원 생산성 향상을 도모하여 어민소득증대에 기여할 새로운 어구어법 개발이 시급히 요구되고 있다. 학공치 표층예망어구는 장래 이러한 문제를 해결 할 수 있는 연안어업의 하나이다. (중략)