In this paper, 1kW prototype PCS for tidal power generation system, which is attracting attention as the next-generation renewable energy, is studied. Tidal power generation is a method of producing energy using the difference between the tides. The advantage of tidal generators is that, unlike other renewable energies such as wave power, wind power, and solar power, they are relatively less affected by the weather changes and are regularly produced at regular intervals.

목적 : 본 연구에서는 체계적 고찰을 통해 지적장애 아동을 대상으로 한 태블릿PC의 활용 유형 및 중재효 과를 분석하여 지적장애 아동을 대상으로 한 치료 중재에 있어서 보다 효율적인 태블릿PC 및 소프트웨 어의 활용을 위한 근거를 마련하고자 한다. 연구방법 : 2010년부터 2015년 12월까지 국외 학술지 검색 시스템을 사용하였고 주요 검색용어로는 ‘tablet PC’와 ‘intellectual disabilities’로 하였다. 추가 검색어로는 ‘iPad’, ‘iPod’, ‘portable multimedia device’, ‘tablet computer’를 사용하여 총 9개의 논문을 선정하였다. 결과 : 태블릿PC 활용유형에 대한 분석을 한 결과 모바일 어플리케이션을 활용한 연구(55.5%), 직접 제작 한 멀티미디어 자료(22.2%), 비디오 모델링(11.1%), 디지털 교과서(11.1%)순으로 나타났다. 태블릿PC 의 중재 결과로는 학업수행 향상(33.3%), 과제수행 변화(22.2%), 수업참여(11.1%), 의사소통(11.1%), 사회성(11.1%)에 관련한 연구 순으로 나타났다. 결론 : 본 연구는 지적아동을 대상으로 한 태블릿PC 활용유형 및 중재결과를 제시함으로서 태블릿PC를 중 재에 활용 하고자 할 때 도움이 될 수 있는 정보를 제공하였고, 향후 치료 목표 및 중재에 대한 근거를 제시 하는데 도움이 될 것이다.

The influence of the internal current for the ZnO ceramics on the sintering behavior by pulse current sintering (PCS) method was investigated. To clear the dependence of inner current on the sintering behavior of ZnO ceramics, direct measurement of electric resistance of ZnO specimen under sintering by SPS device was carried out. It was observed that electric resistance of specimen decreases with increase in the temperature. The electric resistance begins to decrease from the low temperature of . The internal structure of sintered ZnO ceramics changed by the control of the internal current in the specimen using plate.

본 논문은 무선개인통신(PCS) 환경에서 기존의 자원경매다중접속(RAMA) 방법이 가지고 있는 단점을 보완할 수 있는 새로운 자원경매다중접속방법(MRAMA)을 제안하기위한 것이다. 제안된 방법은 경매표 개념을 도입하여 슬럿 할당 주기 상에서 경매 슬럿(slot)을 낭비하는 단점을 보완할 수 있으며, 할당 주기마다 갱신되는 경매테이블을 재택하고 선점 및 비선접 우선순위규칙이 혼합된 방법을 활용함으로써 빠르고 유연하게 접속, 핸드오프, 자원할당이 가능해진다

In this paper, a modified resource auction multiple access for wireless PCS is proposed in response to the disadvantage of RAMA wherein auction slots are wasted in the assignment cycle. A fast and flexible access, handoff and resource assignment are assured by adopting the auction table and the combined preemptive-nonpreemptive priority scheme, in which the auction table is updated in parallel with resource assignment period. Using selected GSM parameters with MRAMA, the performances are always improved over RAMA.

The maximum bond strength of PCS-coated rebar with ultra high-early strength cement and EVA at polymer-cement ratio of 80%, curing ages of 7-day, and coating thickness of 100㎛ is about 1.32 and 1.38 times respectively, the strength of uncoated rebar and epoxy-coated rebar. It is also high bond strength at coating thicknesses of 75㎛ and 100㎛ compared with 150㎛ and 250㎛. It is apparent in this study that the coating thickness is very important factors to improve the bond strength of PCS-coated rebar to cement concrete.

The maximum bond strength of PCS-coated rebar with ultra high-early strength cement and EVA at polymer-cement ratio of 80%, curing ages of 7-day, and coating thickness of 100㎛ is about 1.32 and 1.38 times respectively, the strength of uncoated rebar and epoxy-coated rebar. It is also high bond strength at coating thicknesses of 75㎛ and 100㎛ compared with 150㎛ and 250㎛. It is apparent in this study that the coating thickness is very important factors to improve the bond strength of PCS-coated rebar to cement concrete.

Reinforced concrete hume pipes have been widely used as drain pipes. However, many reinforced concrete hume pipes are exposed to the deteriorated environments such as freezing-thawing damage, chemical attack and chloride ion immersion by using sea sand. The purpose of this study is to improve the durability of reinforced concrete hume pipe by using the polymer cement slurry(PCS)-coated rebar and treating the surface by polymer cement mortar(PCM). From the test results, it is apparent that PCS-coated rebar has a excellent resistance to chloride ion penetration and the PCM has good mechanical properties and durability as a lining material for reinforced concrete hume pipe product.

Bond strength of PCS-coated rebar is better than that of uncoated rebar and epoxy-coated rebar. It is also high bond strength at curing ages of 7-day or less, and coating thicknesses of 75 μm and 100 μm. The maximum bond strength of PCS-coated rebar at curing age of 3-hour is almost same as that of curing age of 1-day and 7-day. The maximum bond strength of PCS-coated rebar with EVA at polymer-cement ratio of 100%, and coating thickness of 100 μm is about 1.23 and 1.29 times respectively, the strength of uncoated rebar and epoxy-coated rebar. It is apparent that the curing age, coating thickness and polymer cement ratio are very important factors to improve the bond strength of PCS-coated rebar to cement concrete. We can havebasic information that it can replace epoxy coated rebar by the PCS-coated rebar with curing age at 3-hour and coating thickness of 100 μm.

The ultimate load of beam reinforced with polymer cement slurry(PCS)-coated rebar that is developed to replace the epoxy coated rebar having many defects is almost the same as that using plain rebar, and is higher than that of epoxy-coated rebar. In special, that using EVA 100% with ultra high early strength cement is a little bigger than that using plain rebar. In this study, it is also apparent that PCS-coated rebar can replace epoxy-coated rebar to solve the corrosion problem in marine construction field.

In this paper, the load transfer test of circular shaped anchorage block to reduce the spacing. The test is in compliance with ETAG013 and KCI-PS101. Test results showed that the strain in compliance with ETAG013 and KCI-PS101 stabilization that satisfy all the criteria.

The filtration tests were made in cell with a low concentrated suspension. The suspension with a concentration of cM=1.14～2.67․10-3 g/g consists of paper paint and water. The particles in the suspension have a particle size x<1㎛. The used depth filters consists of glass fibres, which are coated by polymer. The filtration in depth filters accorded in different mechanism, which were explained by physical models. The model which would be allows to make a promise of the filtration reaction. This filter media allows to get a high filtration time and a good separation rate. The Particle distribution is measured by a photon correlation spectroscopy(PCS). PCS measures particle sizes 0.03 ㎛<d<3 ㎛ in the suspension. The filtered suspension has a very low concentration Co≤5×10-4 g/g of solid in sample. The PCS also informs us about the number of the particles in the suspension. The makes it possible to calculate the concentration of the in sample.