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MOSFET를 이용한 고효율 SCALDO 레귤레이터 구현
권오순,손준배,김태림,송종규,Kwon, O-Soon,Son, Joon-Bae,Kim, Tea-Rim,Song, Jong-Gyu 한국전기전자학회 2015 전기전자학회논문지 Vol.19 No.3
A SCALDO(Supercapacitor Assisted LDO) regulator is a new regulator having advantages of a SMPS(Switch Mode Power Supply) which has a good efficiency and a LDO(Low Drop-out) regulator which has stable output characteristics and good EMI(Electro Magnetic Interference) characteristics. However, a conventional SCALDO regulator needs a lot of power consumption to control its switches and it drops an efficiency of the circuit. In this paper, to reduce switching power consumption and improve an efficiency of the circuit, a new SCALDO regulator adopting MOSFETs as its switching parts is proposed and it is found out that the proposed SCALDO regulator has the maximum 9.5% higher efficiency than the conventional SCALDO regulator. We also try to simplify production process of the circuit by changing switching control method of the circuit from MCU(Micro-controller unit) based firmware control to hardware control using a comparator and a T-F/F(Flip Flop). SCALDO(Supercapacitor Assisted LDO) 레귤레이터는 기존에 널리 사용되고 있는 SMPS(Switch Mode Power Supply)의 장점인 높은 효율과 LDO(Low Drop-out) 레귤레이터의 장점인 안정적인 출력 및 우수한 EMI(Electro Magnetic Interference)특성을 함께 가지는 레귤레이터로 현재 새롭게 연구되고 있는 전원회로이다. 하지만, 현재까지 연구된 SCALDO 레귤레이터의 경우 회로 내부의 스위치제어에 많은 전력이 소비되어 회로 전체의 효율이 감소되는 단점이 있다. 본 논문에서는 기존 SCALDO 레귤레이터의 단점을 극복하고 저전력으로 구동이 가능한 MOSFET를 SCALDO 레귤레이터에 적용함으로써 스위치제어 소비전력을 최소화하여 회로 전체의 효율을 향상시킨 새로운 SCALDO 레귤레이터를 구현 하였으며, 기존 SCALDO 대비 효율이 최대 9.5% 상승됨을 확인하였다. 또한 기존의 MCU(Micro-controller unit)를 이용한 펌웨어제어를 비교기 및 T-F/F(Flip Flop)을 이용한 하드웨어 제어로 대체함으로써 회로의 제작과정을 단순화 하였다.
연약지반 방파제의 시공성능 및 장기침하에 관한 실험적 평가
권오순,장인성,박우선,염기대,Kwon, O-Soon,Jang, In-Sung,Park, Woo-Sun,Yum, Ki-Dai 한국해양과학기술원 2003 Ocean and Polar Research Vol.25 No.suppl3
A new type of soft ground breakwater was recently developed, which does not need ground improvement because of light weight and structural characteristics. The various studies about consolidation settlements and lateral behavior of proposed soft ground breakwater have been conducted. But, the systematic investigations on the construction performance and long-term settlements of new type breakwater has not been accomplished. In this study, construction simulation of soft ground breakwater with soil box model test and experiments of the long-term wave loaded breakwater were performed. The results of test shows that it is possible to compensate differential settlements by dead loading and/or suction pressure, and to reduce the consolidation settlements by preloading method. It was also found that the vertical and lateral displacements of long-term wave loaded breakwater were negligible.
권오순 ( Oh Soon Kwon ) 한국감정평가학회 2007 감정평가학논집 Vol.6 No.1
According to “the main point of making an appraisal report” by Korea Association of Property Appraisers, appraisal for auction along with a court and appraisal for suit along with a court are two appraisal purposes of Korea Association of Property Appraisers’s standards. In general, two appraisal purposes are called the appraisal for a court. In this article, the appraisal for a court mentioned above is classified by 11 characteristics. The 11 characteristics are as follows. ① the difference of basic law along with appraisal ② the difference of terminology along with appraisal ③ the difference of appraiser``s rights ④ the difference of appraisal contract ⑤ the difference of appraiser``s function ⑥ different appraisal between land and building ⑦ appraisal of building that is not presented ⑧ Single appraisal ⑨ automatic price adjustment function in the market of appraisal for auction along with a court. ⑩ probability of insufficiency of allotted task and mutual collaboration between a court and appraisers. ⑪ indistinct charge of appraisal for a court fee In this article, the writer considers the special characteristics of the appraisal for a court and compare with existing general standards that are already arranged by another appraisal purposes. Then, the writer analyzes the judicial precedents made by Korean Supreme Court and set up 8 items of general standards that can be applied to the appraisal for a court. 8 items are as follows. ① the standard of price estimation of those days ② the standard of present circumstance appraisal ③ the standard of appraisal along with restraint in civil law ④ the standard of appraisal including benefit done by development ⑤ the standard of appraisal for a building not presented ⑥ the standard of division appraisal between land and a building ⑦ the standard of appraisal along with exercising appraiser``s authority ⑧ the standard of appraisal done by appraisers themselves The methodology of instituting the above 8 general standards of appraisal bases upon the inductive method in Logic.
감정평가액 편차의 허용한계와 그 비율의 관념 및 활용방안에 관한 고찰
권오순 ( Oh Soon Kwon ) 한국감정평가학회 2009 감정평가학논집 Vol.8 No.1
The writer researched the types of inevitable deviation in real property appraisal in view of the gap of value against price, the multiplication-of-value concept and the cause of valuation system involved. It was scientifically turned out that the application of the tolerance limit and its ratio could resolve the problems regarding the inevitable deviation of appraisal amounts mentioned above in real property valuation. The upper limit of tolerance limit and the lower limit of it would be defined as ‘tolerance limit ratio.’ Tolerance limit and its ratio might be known as a terminology newly developed. If the deviation which is generated among various appraisal amounts distributes within the scope of the tolerance limit, there are not remarkable differences among the various appraisal ones. After all, tolerance limit and its ratio will be able to become a guide line for appraisers to find the remarkable differences among various appraisal ones.
권오순(Oh-Soon Kwon) 한국부동산연구원 2003 부동산연구 Vol.13 No.2
임료의 감정평가는 시장접근법, 비용접근법, 수익접근법으로 수앵된다. 이 논문에서는 그중에서도 비용접근법을 중심으로 하여 임료 감정평가의 방법론을 논술하게 된다. 우리나라와 일본에서는 비용접근법으로써 임료를 산출하는 방법을 적산법이라고 부른다. 미국에서는 적산법이라는 용어를 사용하지 아니하며, 가격산정의 경우와 마찬가지로 그냥 비용접근법이라고 부르고 있다. 적산법을 적용하여 임료를 평가하기 위애서는 기초가격의 개념을 바로 정립해야만 할 것이다. 또한 기초가격에 곱하게 되는 기대이율도 임료산정에 있어서는 빼놓을 수 없는 주요 요소인 것이다. 본고에서는 기초가격과 기대이율 및 필요제경비의 개념 및 그 산정 방법 등에 관하여 논술하게 될 것이다. 특히, 본고에서는 기대이율의 적용과 관련이여 법적 근거와 대법원 판례를 소개하였으므로, 독자들에게 참고가 되기를 바란다. Rent appraisal is conducted in market data approach, cost approach or income approach. This article aims to address and discuss the methodology of rent appraisal on the basis of cost approach. In Korea and Japan. the method of estimating rent in cost approach is called summation approach . while it is simply called cost approach in USA, without any distinction from the term used in the case of cost estimation. To appraise rent in application of summation approach. the concept of beginning price should be established first. Besides. the expected rate of return should be included as a major factor in rent estimation, which should be multiplied to beginning price Therefore. this article discusses the concepts of beginning price and expected rate of return along with its decision method. In particular, this article cites the legal grounds and the judicial precedents made by Korean Supreme Court in the hope of presenting good references for readers.