본 연구에서는 인공위성 및 재분석 자료인 Global Land Data Assimilation System (GLDAS), Global Land Evaporation Amsterdam Model (GLEAM), MOD16의 실제증발산량 산출물을 활용하여 한국수자원조사기술원(Korea Institute of Hydrological Survey, KIHS)에서 관리하고 있는 청미천(cheongmicheon farmland site, CFK)과 설마천(seolmacheon site, SMK) flux tower에서 검증하였고, Triple collocation (TC) 방 법을 활용하여 자료간의 불확실성 및 상관성분석을 수행하였다. 플럭스타워와의 검증 결과에서는 전반적으로 GLEAM>GLDAS>MOD16순으로 좋은 결과를 나타내었으며, 세가지 산출물의 조합(S1: flux tower vs. GLDAS vs. MOD16, S2: flux tower vs. GLDAS vs. GLEAM, S3: flux tower vs. GLEAM vs. MOD16)을 통한 TC 결과에서는 청미천(설마천)에서 GLEAM>GLDAS>MOD16>flux tower (GLDAS>GLEAM>MOD16>flux tower)순으로 좋은 결과를 나타내었다. TC 분석 결과에서 Flux tower의 error variance와 correlation coefficient가 상대적으로 좋은 결과를 나타내지 못하였으므로, 한반도 지역에서 인공위성과 재분석 자료(GLDAS vs. GLEAM vs. MOD16)만을 활용하여 TC를 적용하였다. 그 결과, GLDAS 와 GLEAM이 한반도 영역에서 낮은 error variance 와 높은 correlation coefficient를 나타낸 반면, MOD16의 경우, 농지에서 낮은 correlation coefficient과 높은 error variance를 나타내었다.

Recently, interests for maintenance of transmission tower are increasing to extend life of structures and reduce maintenance cost. However, existing classical diagnosis method of corrosion deteriorated degree on the transmission tower steel members, visual inspection, has a problem that error often due to difference of inspector’s individual knowledge and experience. In order to solve the problem, this study carried out to develop the corrosion deterioration inspection tool for transmission tower steel members. This tool is composed of camera equipment and computer-aided diagnosis system. We standardized the photographing method by camera equipment to obtain suitable pictures for image processing. Diagnosis system was designed to evaluate automatically degree of corrosion deterioration for member of transmission tower on the basis of the RGB color image processing techniques. It is anticipated that developed the corrosion deterioration inspection tool will be very helpful in decision of optimal maintenance time for transmission tower corrosion.

Authors investigated the fatigue bond performance on the grouted joint connection of wind tower. High strength cementeous grout has 140MPa of a compressive strength was incerted in the gap of small scaled steel tube simulated the wind tower joint. The stress level was 65 and 74% of static strength that is 35MPa, respectevely. From the test, each specimens endured the repeated loads up to 2,000,000 cycles.

The organic solvent is used in many industries. Generation of waste organic solvent is continuously increasing. The 2009 years total domestic production organic solvent is in use 21% total designation waste production with 682 thousand tons. processes of a waste organic solvent and management issue is increasing in advanced countries. To resolve this problem, evaluate the characteristics of a batch distillation column purification to propose alternative. Therefore, this study compares a refinement recovery characteristic of simple distillation and 10-stage distillation tower. It grasps a characteristic regarding refinement recovery of the waste organic solvent (Propylene Glycol Mnomethyl Ether Acetate)PGMEA which occurred at LCD processes through study of a hundred steps of distillation tower. In this study, the evaluate scale-up separation characteristics difference using 10-stage and 100-stage batch distillation column. The actual process of making a demonstration plant appointed by using waste organic solvents of high purity propose a method for recycling.

In this study, bond performance of grouted joint with high performance cement grout was verified. The grout which the compressive strength of grout was over 120MPa. was applied for wind turbine tower connections. From the results, the connection joint using high performance grout has sufficient bond strength.

Finite analysis of tower structure using beam element and shell element. Investigation of collapse mechanism including local and global failure. Verification of analysis model through comparison with actual collapsed tower structure. Propose of analytical ultimate strength of member based on nonlinear analysis of local and partial finite element model.

Finite element analysis using Tower of the beam element. Investigate the mechanisms leg buckling of tower parts. Characterization of the role and behavior of aids and aids to optimize the use of the present one square Envoy maximize workability and economy. The proposed square Envoy existing triangle to reveal that more than reasonable and the absence of nodal wind load compared to the size of history.

Wind Turbine Tower takes about 26.3% of overall wind turbine cost. So tower shell design is very important part. When designing tower eigenfrequency, strength analysis, fatigue strength analysis, buckling analysis and flange connection analysis have to considered. This paper contains procedure of tower analysis and compare ABAQUS result with design specification

For the optimized design of the wind turbine tower, demonstrate the superiority of ability to resist the lateral load on the ICH-CFT, i.e. ability to resist the moment, compared to Steel Tubular Type that is mainly used in the existing, by using P-M Diagram

This study estimated extreme wind speed by means of national wind map, provided by Korea Institute of Energy Research, to sustain the wind towers’ structural stability that is required for the production of mass wind power. The number of research object regions is three in the East, West and South seas. Meteorological resource data were calculated by dividing the data into the various reference periods. In addition, Gumbel distribution method and Extreme Wind Speed Model (EWM) indicated in IEC 61400-3 were adopted to measure the extreme wind speed. In conclusion, it is discovered that the more suitable Gumbel distribution method is to secure the stability of wind towers.

기후변화로 야기될 수 있는 태양복사에너지의 공간적인 불균형은 수자원을 포함한 전반적인 생태 시스템에서의 에너지 불균형을 초래한다. 따라서 정확한 에너지의 흐름을 이해하기 위하여 정량적인 관측을 목적으로 하는 플럭스 타워가 세계 곳곳에 설치되어 운영되고 있다. 국내의 주요 지역에서도 플럭스 타워를 통안 관측이 실시되고 있는 데, 본 연구에서는 이 중 설마천과 청미천 유역의 플럭스 타워의 자료를 대상으로 수문기상 및 생태학적으로 중요한 역할을 하는 에너지원인 하향 단파 및 장파 복사량과 순복사량을 기존의 연구에서 제안된 물리식을 기반으로 계산하고, 산정된 순복사량과 관측 자료를 비교·검증하였다. 이를 통하여 관측이 미흡한 수문기상인자에 대해 기존의 물리적인 방법의 사용 가능성 및 관측 자료의 활용 가능성을 확인하였다.

일반적으로 송전철탑 부재들의 보강은 적절한 그라우팅재를 활용한 인젝션과 구조 보강재 부착을 이용한 단면 확장에 따른 강성보강 방식을 주로 사용한다. 이와 같은 그라우팅 인젝션 및 단면보완은 주로 축력능력을 확장시키는 데에 의미를 갖는다. 그렇지만 보다 안정적 상태를 유지케 할 수 있는 보강방안이 적극 요구되는데 그 방법은 좌굴에 의해 손상을 받은 부재를 원상태의 길이로 환원시키고, 또한 내부적 보강효과를 동시에 갖는 새로운 부재로 교체하는 것이다. 본 연구에서는 기초침하로 구조적 손상을 받은 송전철탑의 손상회복을 위한 실증적 과정으로 우선 현장에서의 손상도 확인점검과 손상상태 및 회복상태에 대한 수치 해석적 결과를 도출하였고, 새롭게 고안한 잭킹시스템을 이용하여 보강된 부재를 교체하는 과업을 수행하였다. 이 결과는 송전철탑 유지관리의 차원상승 효과를 갖게 한다.