• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.1
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• pp.182-189
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• 2012

This study suggests a dynamic design process for deciding properly design parameters of a mass-spring type Wave Energy Converter (WEC) to achieve sufficient energy conversion from wave to power generator. The WEC mechanism, in this research, consists of a rigid sprung body, a platform, suspension springs and dampers. The rigid sprung body is supported on the platform via springs and dampers and vibrates translationally in the heave direction under wave excitation. At last the resulting heave motion of the sprung body is transmitted to rotating motion of the electric generator by rack and pinion, and transmission gears. For the purpose of vibration analysis, the WEC mechanism has been simply modelled as a mass-spring-damper system under harmonic base excitation. Its maximum displacement transmissibility and steady state response can be determined by using elementary vibration theory if the harmonic ocean wave data were provided. With the vibration analysis results, the suggested dynamic design process of WEC can determine all the design parameters of the WEC mechanism, such as sprung body mass, suspension spring constant, and damping coefficient that can give sufficient relative displacement transmissibility and the associated inertia moment to drive the electric generator and transmission gears.

• Ocean Systems Engineering
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• v.12 no.1
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• pp.39-61
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• 2022

Renewable energy such as wave energy has gained popularity as a means of reducing greenhouse gases. However, the high cost and lack of available sea space in some countries have hindered the deployment of wave energy converters (WEC) as alternative means of sustainable energy production. By combining WECs with infrastructures such as floating breakwaters or piers, the idea of electricity generated from WECs will be more appealing. This paper considers the integration of vertical raft-type WEC (commonly known as the vertical flap WEC) with floating breakwater as means to generate electricity and attenuate wave force in the tropical sea. An array of 25 WECs attached to a floating breakwater is considered where their performance and effect on the wave climate are presented. The effects of varying dimensions of the WEC and mooring system of the floating breakwater have on the energy generation are investigated. The integrated WECs and floating breakwater is subjected to both the regular and irregular waves in the tropical sea to assess the performance of the system. The result shows that the integrated vertical flap-floating breakwater system can generate a substantial amount of wave energy and at the same time attenuate the wave force effectively for the tropical sea when optimal dimensions of the WECs are used.

• Biomolecules & Therapeutics
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• v.2 no.1
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• pp.59-64
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• 1994

The water extract of pilose antler of Cervus nippon var. mantchuricus (WEC) was investigated in respect of its effect on ceruloplasmin and $\alpha$$_1$-cysteine protease inhibitor (CPI), which are acute-phase proteins showing increased synthesis following inflammatory stimulus in rat. Ceruloplasmin and CPI were spectrophotometrically determined by the oxidase activity and the inhibitory activity on papain, respectively, and their changes in the concentrations in plasma or serum were examined after oral administration of 0.04% WEC to rats during 7 days following inflammation by subcutaneous injection of turpentine oil or lipopolysaccharide (LPS). WEC suppressed the maximum increases in ceruloplasmin and CPI on the 4th day after injection of turpentine oil, but the suppression in ceruloplasmin was more potent than that in CPI. On inflammation by LPS the suppression of the maximum increase in ceruloplasmin by WEC was found on the 2nd day, but the result was less significant from that obtained by the treatment with turpentine oil. Administration of WEC for at least 4 days was required to suppress the maximum increase in ceruloplasmin due to inflammation by turpentine oil. When WEC was administered to rats after injection of turpentine oil, a high dosage (0.36% of WEC) was requisite for the suppression on the maximum increase in ceruloplasmin.

• 에너지협의회보
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• s.61
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• pp.33-35
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• 2002

• 에너지협의회보
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• s.74
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• pp.26-31
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• 2005

WEC의 설립목적은 인류의 최대 편익을 위해 지속가능한 에너지자원의 공급과 이용을 촉진하는데 있다. 비영리, 多에너지(multi-energy), 에너지사업자 중심의 국제 민간조직인 WEC는 약100개 회원국의 자발적 참여와 기여를 바탕으로 운영되며, 매3년 개최하는 세계에너지총회(World Energy Congress) 등 다양한 국제회의를 통해 교류의 장을 제공하고, 에너지자원 통계뿐만 아니라 세계적 이슈가 되는 주요토픽에 대해 에너지업계의 다양한 의견을 조율하고 실효성 있는 정책 대안을 제시한다. 다음은 WEC가 2005년부터 3년간 수행할 연구조사 프로젝트의 개요이며, 현재다수프로젝트에국내전문가가참여하고있다.

• 에너지협의회보
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• s.17
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• pp.44-49
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• 1990

• 에너지협의회보
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• s.16
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• pp.50-51
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• 1990

• 에너지협의회보
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• s.13
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• pp.20-27
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• 1989

• 에너지협의회보
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• s.13
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• pp.14-19
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• 1989

• JOURNAL OF ELECTRICAL WORLD
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• s.376
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• pp.16-21
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• 2008