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MD 매질을 이용한 이동통신용 Quad-Band 소형 안테나 설계 및 구현에 관한 연구
김우수,윤철,오순수,강석엽,박효달,Kim, Woo-Su,Yoon, Cheol,Oh, Soon-Soo,Kang, Suk-Youb,Park, Hyo-Dal 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.5
본 논문에서는 GSM850/GSM900/DCS1800/DCS1900 대역의 Quad-Band 안테나를 설계 및 제작하였다. 안테나의 소형화를 위해 MD(Magneto-Dielectric) 매질을 사용하여 기존의 PIFA(Planar Inverted-F Antenna) 안테나 보다 67.9%의 크기를 감소시켰으며, 광대역 특성을 얻기 위해 접지된 패치 구조로 커플링 방식을 이용한 간접급전 구조를 사용하였다. 제안한 안테나는 휴대 단말기에 적합한 소형화된 사이즈 ($25\;mm\;{\times}\;10\;mm\;{\times}\;2\;mm$)를 가지며, 동축 케이블을 이용하여 급전하였다. 또한 임피던스 대역폭은 VSWR < 3 (${\leq}\;-6\;dB$)에서 1341 MHz(801~2142 MHz)의 광대역 특성을 나타내며, 동작 대역에서 -6.67~4.25 dBi의 이득 및 전방향성 방사특성을 얻었다. In this paper, Quad-Band small antenna for GSM850, GSM900, DCS1800, DCS1900 is designed and fabricated. The antenna achieved the size reduction of over 67.9 % than the conventional PIFA(Planar Inverted-F Antenna) by using a MD(Magneto-Dielectric) material. A simple feeding microstrip line is used to feed the antenna from a $50{\Omega}$ coaxial line, which is capacitively coupled to the grounded patch structure for broadband characteristics. The impedance bandwidth the proposed antenna shows good results as broadband characteristics of 1341 MHz (801 ~ 2142 MHz) in VSWR < 3 (${\leq}\;-6\;dB$) and the gain is -6.67 ~ 4.25 dBi in the operating frequency.
생태계 기반 어업관리 방안을 위한 사회경제적 평가지표의 개발 및 적용: TLS 기법 적용을 중심으로
김우수 ( Woo Soo Kim ),김도훈 ( Do Hoon Kim ) 한국수산경영학회 2011 수산경영론집 Vol.42 No.1
An ecosystem-based fisheries management (EBFM) approach becomes more important as an alternative management method for a sustainable development of fisheries domestically and internationally. Many methods of applying a practical EBFM to fisheries management have been investigated, and considerable attention has been given to developing effective indicators of the present status of and changes in ecosystems and putting them to practical use. Among ecosystem indicators, developing socioeconomic indicators for EBFM is particularly important. This is because socioeconomic factors have direct effects on ecosystems, and ecosystems have direct effects on socioeconomic factors. Therefore, it is imperative that socioeconomic indicators are developed and evaluated in order to predict changes in ecosystems and to provide advice for effective fisheries management. This study is aimed to develop socioeconomic indicators which can be combined with biological and ecological indicators, in order to conduct the ecosystem-based fisheries assessment. In terms of socioeconomic indicators, five socioeconomic criteria were considered as important attributes of socioeconomic changes. These criteria include economical production, business conditions, income, market, and employment indicators. For evaluation of newly developed socioeconomic indicators, the Traffic Light System (TLS) method was used. In addition, on the basis of the application of developed indicators to the Korean large purse seine fishery, the socioeconomic conditions of the fishery and the usefulness of the indicators were evaluated and management implications were discussed.
연안어선어업 피해율 산정을 위한 원가행태에 관한 실증연구
김우수 ( Woo Soo Kim ),김길용 ( Kil Yong Kim ) 한국수산경영학회 2011 수산경영론집 Vol.42 No.3
It is necessary to set up a standard of estimation for annual unit price of sale and cost, damage rate for calculating compensation against fishery damage objectively. Two items on the unit price and cost have regulations but the damage rate has not, so it may occurred some problems such as reasonability and balance because the estimation should be handling by an appraiser`s knowledge and experience. This study has analyzed using Regression model and searched variable costs and fixed costs about each items appraisers to operate in the present. It is compare profit damage index is calculated by an estimated model and an appraised example. This analysis showed highly 23-30% estimated model more than appraised example. It means the overestimation for fishery damage. This difference has caused by Limited data, Lack of sample, much difference in the standard deviation, and has not classified each kind of business and weight of coastal fishery, the overestimation more than what expected. This study has analyzed that the applied rate of fixed and variable cost in relation to the compensation in the cost of coastal fishery is very valuable.
비가수 솔-젤 법을 이용한 저유전율 유-무기 하이브리드 재료
최천기 ( Chaun Gi Choi ),김우수 ( Woo Soo Kim ),배병수 ( Byeong Soo Bae ) 대한금속재료학회 ( 구 대한금속학회 ) 2005 ELECTRONIC MATERIALS LETTERS Vol.1 No.1
In this paper, we report the fabrication of fluorinated organic-inorganic hybrid materials and the investigation of the effects of fluorine contents on the dielectric constant of the fluorinated organic-inorganic hybrid materials. Thickness of the hybrid thin film was about 500 nm by single spin coating and the adhesion between the substrate and the hybrid film was good. Dielectric constants of hybrid thin films decreased from 4.2 to 2.98 (at 1 MHz) as the fluorine content increased.
강종호 ( Jong-ho Kang ),김우수 ( Woo-soo Kim ) 한국수산경영학회 2019 수산경영론집 Vol.50 No.4
Seaweed by-products have been dumped into the sea and induced marine pollution. However, they can be recycled as a valuable natural resources. Approximately 240,000 tons of sea mustard and kelp by-products were estimated to be producted during the last three years. The estimate corresponds 6.7% of the total production of marine aquaculture and 14.9% of the total production of seaweeds. When adding up the by-products from fish and mollusks, approximately 1,000,000 tons of fisheries by-products were thrown out into the sea every year. A three-step strategy is required for the industralization of fisheries by-products. The first step is the construction of the processing foundation of by-products, the second is its food industralization, and the third is its recycling as raw biomaterials. The stable supply of raw materials is the prerequisite for the industralization. Thus, it is necessary to construct the refuse logistics around chief production districts and to build the processing facility and frozen storage of by-products. Cooperation among private enterprises and government investment for research and development is required the second and third steps.
근해통발어업 임금지급방식의 문제점에 관한 연구 - 선급금 지급 관행을 중심으로 -
문성주 ( Seong-ju Moon ),김우수 ( Woo-soo Kim ),강종호 ( Jong-ho Kang ) 한국수산경영학회 2019 수산경영론집 Vol.50 No.1
Offshore trap fishery managers have payed in advance to attract excellent fishing crew in the minium grantee lay system. This practice can intensify competition among fishery management bodies and increase the burden of fishery manager about income tax and four social insurance programs. The purpose of this study is to identify the problems of advance payment practice in terms of fishery manager in offshore trap fishery. The main results of this study are as follows. First, under the TYPE 1 model, which is the current wage payment manner, there is a risk that fishery manager will not able to return the prepayment paid in advance when the income of fishery management bodies decrease. Second, the TYPE 2 or the TYPE 3 model which reduces or abolishes advance payment can alleviate the burden of fishery manager relative to the deduction of redemption amount, incentive to induce artificial expenses, income tax and four social insurance programs. In conclusion, advance payment practice in offshore trap fishery is placing a heavy burden on the fishery manager. In order to solve these problems in the future, we need to find solutions through similar case studies.