The objective of this study is to investigate patent trends of Daegu city which tries to introduce environment friendly energy and to develop new technology or new industry sprung from technology convergence on smart decentralized energy technology and other technologies. After applying network analysis to corresponding groups of technology or industry convergence, strategy for future energy convergence industry is provided. Patent data applied in Daegu city area are used to obtain research goal. The technology which contains several IPC codes (IPC Co-occurrence) is considered as a convergence technology. Path finder network analysis is used for visualizing and grouping by using IPC codes. The analysis results categorized 13 groups in energy convergence industry and reclassified them into 3 cluster groups (Smart Energy Product Production Technology Group, Smart Energy Convergence Supply Technology Group, Smart Energy Indirect Application Technology Group) considering the technical characteristics and policy direction. Also, energy industry has evolved rapidly by technological convergence with other industries. Especially, it has been converged with IT industry, and there is a trend that energy industry will be converged with service industry and manufacturing industry such as textile, automobile parts, mechanics, and logistics by employing infrastructure as well as network. Based on the research results on core patent technology, convergence technology and inter-industry analysis, the direction of core technology research and development as well as evolution on decentralized energy industry is identified. By using research design and methodology in this study, the trend of convergence technology is investigated based on objective data (patent data). Above all, we can easily confirm the core technology in the local industry by analyzing the industrial competitiveness in the macro level. Based on this, we can identify convergence industry and technology by performing the technological convergence analysis in the micro level. 1

Fe-base superalloy powders with Y2O3 dispersion were prepared by high energy ball milling, followed by sparkplasma sintering for consolidation. High-purity elemental powders with different Fe powder sizes of 24 and 50mm were usedfor the preparation of Fe-20Cr-4.5Al-0.5Ti-O.5Y2O3 powder mixtures (wt%). The milling process of the powders was carriedout in a horizontal rotary ball mill using a stainless steel vial and balls. The milling times of 1 to 5 h by constant operation(350 rpm, ball-to-powder ratio of 30:1 in weight) or cycle operation (1300 rpm for 4 min and 900 rpm for 1 min, 15:1) wereapplied. Microstructural observation revealed that the crystalline size of Fe decreased with an increase in milling time by cyclicoperation and was about 15nm after 3 h, forming a FeCr alloy phase. The cyclic operation had an advantage over constantmilling in that a smaller-agglomerated structure was obtained. The milled powders were sintered at 1100oC for 30 min invacuum. With an increase in milling time, the sintered specimen showed a more homogeneous microstructure. In addition, ahomogenous distribution of Y-compound particles in the grain boundary was confirmed by EDX analysis.

최근 들어 기후변화로 인해 물과 에너지 순환에 관한 정확한 이해가 요구되고 있다. 현재 미기상학적 플럭스 타워 네트워크는 수문학적, 생태학적 분석에 있어서 주춧돌역할을 하고 있다. 하지만 플럭스 타워의 에디공분산 방법을 활용한 잠열 플럭스 측정은 여러 가정사항에 따른 시스템적 오류를 내포하고 있고 이에 따라 과소평가된 잠열 플럭스 원시자료의 보정이 필요하다. 몇몇의 보정방법 중 보엔비를 활용한 방법이 가장 유용한 방법 중 하나로서 여기에는 플럭스타워에서 측정한 순 복사에너지 및 기타 플럭스(현열, 지열) 등이 요구되며 이러한 자료에 대한 정확한 측정 및 검증이 필요하다. 본 연구에서는 설마천, 청미천 유역의 플럭스타워에서 측정된 순 복사에너지를 검증하기 위해 두 가지 형태의 이론적으로 계산된 순 복사에너지와의 비교검증을 실시하였다-(1) FAO 56 기반의 일평균 순 복사에너지 (2) Bastiaansen (1995)가 제안한 순간 순 복사에너지. 본 연구의 결과는 플럭스타워에서 측정된 순 복사에너지는 이론적으로 계산된 순 복사에너지와 상당히 비슷한 경향성을 보인다는 것을 제시했다. 또한, 측정된 순 복사에너지를 이용하여 관측된 잠열플럭스를 보엔비 보정방법에 적용시킨 결과 에너지수지에 더욱 부합하는 것을 알 수 있었다.