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Microstructure and Compression Properties of Fe-Cr-B Alloy Manufactured using Laser Metal Deposition

100%

Joo Y.-A. , Yoon T.-S. , Park S.-H. , Lee K.-A.

nr 3

Air-void Analysis System of Polished Concrete Using Image Processing

100%

Park S.-H. , Kim H.-K. , Morales A. , Ko S.-J.

tom Vol. 15, nr 2

19-25

This paper presents an efficient algorithm to distinguish airvoids of polished concrete specimens using image processing for a fully automated image analysis system. In order to distinguish air-voids from aggregates and cement paste, the proposed algorithm adopts mathematical morphology and color image processing. First, air-voids and aggregates are extracted, based on a global threshold which is selected from histogram processing so that the proposed algorithm can cope with the variation of illumination; then, color and noise information discriminate between aggregates and air-voids. Experimental results show that the proposed algorithm can be applied to a fully automated image analysis system.

Gastrin promotes intestinal polyposis through cholecystokinin-B receptor-mediated proliferative signaling and fostering tumor microenvironment

75%

Han Y.-M. , Park J.-M. , Park S.-H. , Hahm K. B. , Hong S. P. , Kim E.-H.

tom 64

nr 4

Effect of Heat Treatment on Microstructure and Impact Toughness of Ti-6Al-4V Manufactured by Selective Laser Melting Process

75%

Park S.-H. , Lee K.-A. , Kim Y.-K. , Yu J.-H. , Kim M.-C.

Physiological mechanism of drought tolerance in transgenic rice plants expressing Capsicum annuum methionine sulfoxide reductase B2 (CaMsrB2) gene

63%

Siddiqui Z. S. , Cho J.-I. , Kwon T.-R. , Ahn B.-O. , Lee K.-S. , Jeong M.-J. , Ryu T.-H. , Lee S.-K. , Park S.-C. , Park S.-H.

nr 05

The methionine sulfoxide reductase B2 (MsrB2) gene catalyzes the reduction of free and protein-bound methionine sulfoxide to methionine and is known to provide tolerance to biotic and abiotic environmental stresses. There are yet to be any reports that MsrB2 enhances drought tolerance. Two drought-tolerant transgenic rice lines, L-8 (single copy) and L-23 (two copy), expressing the Capsicum annuum MsrB2 (CaMsrB2) gene were selected for stress tolerance phenotyping under drought stress conditions. CaMsrB2 enhanced relative water content, maintained substantial quantum yield (Fv/ Fm ratio), and subsequently improved photosynthetic pigments. Interestingly, L-23, carrying two-copy T-DNA insertion, showed greater drought tolerance through more effective stomatal regulation, carotenoid concentration, and osmotic potential than the wild type. High-tech infrared technology (FLIR SC620) was used for the selection of stress-tolerant physiotypes. Later, the IR results were correlated with other tested physiological parameters. The IR images, average plant temperature, and physiological parameters of the treated plants are discussed in detail.