• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.849-850
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.109-110
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• 2011

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.845-846
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• 2010

• Journal of the Korean Society for Precision Engineering
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• v.22 no.5 s.170
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• pp.189-196
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• 2005

The numbers of the elder are rapidly growing who wants to enhance social activities, because Korea is already an aging society since 2000. The mobility and accessibility are the key issues to enhance them. The electric motor scooter and the power wheel chair are efficient movable means at a short range. It would be needed to get on and off them if the elder wants use them after arriving a long distant destination. But the electric scooter is too heavy for a man to get on and off a coach van. The motor winch lift is developed for the elder and the handicapped to get on and off a van easily. The lift consists of 3-linkage which can be installed in a trunk of a van with a small space. The clearance and stress of each component are checked by a computer simulation. The prototype was made. and the performances of safety and comfortableness were verified by operational ability test and durability test.

• Textile Coloration and Finishing
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• v.11 no.2
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• pp.64-74
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• 1999

The driving characteristics of the 1 tube 2 chamber bent silkworm type dyeing machine are reported. This dyeing machine is a newly developed energy saving machine. In this study, the driving characteristics of the 1 tube 2 chamber bent silkworm type dyeing machine are examined. Specially the relationship between main body pressure and the electric current of the blower motor, the relationship between main body pressure and the air pressure of the blower nozzle, the effect of the air pressure of the blower on the running speed of the fabric, and the effect of main body temperature were discussed experimentally. Through the experimental data, the following results were obtained. 1. Blower motor electric current and blower nozzle air pressure increased as main body pressure increased due to the temperature increase of the main body. 2. The running speed of the fabric increased as blower nozzle air pressure increased. The difference in running speed between winch reel driving and no winch reel driving at a blower frequency of 60Hz was higher than that of 70Hz. 3. The electric current of the blower rioter and blower nozzle air pressure increased rapidly at the initial state. As the experimental time passed, the main body pressure increased slowly. as the main body temperature increased.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.458-459
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• 2008

본 논문은 폭넓은 전기환경 실증연구가 가능한 실규모 HVDC 시험선로의 설계 및 구축에 대해 소개한다. 국내 실정에 적합한 초고압 가공 직류송전(HVDC)선로 설계를 위해서는 전기적인 환경 장애를 일으키지 않는 환경친화적인 설계 및 건설에 대한 대안이 마련되어야 한다. HVDC 선로의 전기적인 환경영향은 주로 (+)극과 (-)극에서 발생하는 이온의 흐름에 의한 이온전류 밀도, 대전전압, 지표면전계강도 등 이온류(Ion流)의 영향과 초고압 송전에 따른 코로나 영향에 대해 검토하는 것이다. HVDC 실규모 시험선로는 요크, 특수 애자련, 특수 arm을 사용하여 철탑의 극간 배치, 도체 배치 변경 및 지상고 변경이 가능하도록 winch를 채용하여 절연설계 조건의 유동성, 환경, 지지물, 송전기자재, 경제성 및 운용의 효율성을 종합적으로 고려할 수 있도록 특수한 형태로 설계하여 각종 전기환경 실증연구가 가능하며 국내 환경 특성에 적합한 최적 극배치 좌표 도출이 가능하도록 구축되었다. 본 논문은 상용 가공 HVDC 송전방식의 적용에 앞서 현재의 상황을 고려한 전기환경 실증 연구가 가능한 실규모 HVDC 시험선로의 설계 및 구축에 대하여 기술하였다.

• Proceedings of the KIEE Conference
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• 2008.04b
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• pp.28-30
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• 2008

본 논문은 국내 실정에 적합한 초고압 가공 직류 송전(HVDC)선로 설계를 위해서 세계적으로 처음 시도되는 가변 기능을 지닌 Proto Type HVDC 실규모 시험선로의 설계와 구축에 대해 소개한다. 시험선로는 초고압 직류송전시 발생하는 이온의 흐름에 의한 이온전류 밀도, 대전 전압, 지표면 전계강도 등 이온류(Ion류(流))에 의한 전기환경장애 및 코로나 영향을 검토하여 환경 친화적 HVDC 송전선로 설계기준을 도출하는데 있다. 이에 따라 HVDC 실규모 시험선로는 요크, 특수 애자련, 특수 arm을 사용하여 철탑의 극간 배치, 도체 배치 변경 및 지상고 변경이 가능하도록 winch를 채용하여 절연설계 조건의 유동성, 환경, 지지물, 송전기자재, 경제성 및 운용의 효율성을 종합적으로 고려할 수 있도록 특수한 형태로 설계되었으며, 본 논문은 상용 가공 HVDC 송전방식의 적용에 앞서 현재의 상황을 고려한 가공 HVDC 실증시험을 수행하기 위한 시험선로의 설계 및 구축에 대하여 기술하였다.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.679-681
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• 2005

The materials for transmission line construction were transported by road which opened in mountainous areas until the mid 1990s, However, from the mid 1990s, as social interest in the environment standard increases, a cable way and helicopter transport methods of construction have been applied to minimize damage to the environment and to build an environmental friendly system. The current cable way method is a single cable way system which has a lower section base to load materials into a carriage and carry them to the tower construction site by use of an engine and a main rope. Then the carriage lowers itself via a slope between the tower construction site and the lower section base. The single cable way system has the demerits of site acquisition for the lower section base, forest felling when installing the wire rope, and it is not applicable to a even topology Also it has to be installed separately at each tower site. Accordingly, to carry materials without forest felling and regardless of slope, the chain cable way system was developed to provide materials for more than two towers consecutively by use of an engine carriage and winch.

• Journal of Animal Environmental Science
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• v.15 no.3
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• pp.231-240
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• 2009

In this research pig house facilities what are 3,029 houses hold over 1000 heads were surveyed by scale and province. Full-time farms hold over 1000 heads breed total 7,229,892 heads. And farms breed 2,386.9 heads averagely. Pig houses were constructed august 1995 averagely. Each of houses have $3,017.2\;m^2$ scale. The construction type of pig house was winch-curtain type 77.2% which was most popular, confined type 51.3%, litter type 7.4% and loft type 4.6%. The winch-curtain type was popular than windowless type in pig farms which have 1,000-1,999 heads. But pig house construction type which have more than over 10,000 heads was windowless type more than winch-curtain type. Manure removing type was slurry 72.3% and scraper 38.5% in farms which have 1,000-1,999 heads. Manure removing type was slurry 83.3% in farms which have over 10,000 heads. Proportion of roof type of pig house was slate 51.2%, panel 46.1%. But in middle or small farms, slate type was only 25.0%. Proportion of wall type of pig house was 41.9%, block 21.9%, concrete 7.6%, winch-curtain 6.3%, and bnck 5.9%. Ventilation type of pig house was natural winch 46.1%, mechanical windowless 69.8% and mixed type 53.1%. So, mechanical windowless type was popular than natural winch type. Especially the farm scale is bigger the mechanical widowless type was more. Utilization period of pig house was 8.1 years about automatic feeder, 8.3 years about waterer, 8.2 years about electric facilities and 9.0 years about floor material. Thus, almost of facilities were used at least 8 years.

• Journal of Navigation and Port Research
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• v.41 no.5
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• pp.337-344
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• 2017

In the offshore crane system, the requirements on the operating safety are extremely high due to many external factors. Rope extension is one of the factors producing vertical vibration of load. In this study, the load is carried by the motor-winch actuator control and the rope is modeled as a mass-damper-spring system. To control the load position and suppress the vertical vibration of the load, a control system based on input-output linearization method is proposed. By the simulation and experiment results with pilot crane model, the effectiveness of proposed control method is evaluated and verified.