(1) N. Kobayashi, K. Kumakura, T. Makimoto, T. Hashizume, T. Fukui, and H. Hasegawa, gCharacterization of Heterojunction in High Current Gain GaN/InGaN Heterojunction Bipolar Transistorsh, 31st Conference on The Physics and Chemistry of Semiconductor Interfaces (PCSI-31), Hawaii, USA (Jan. 2004). (2) T. Nishida, T. Ban, H. Saito, N. Kobayashi and T. Makimoto, gHigh power extraction of 340 to 350-nm UV-LEDsh, Photonics West, San Jose, USA (Jan. 2004). (3) K. Furukawa, gSingle polymer science based on semiconducting polymerh, International Workshop gBeam Science and Nanotechnologyh, Osaka, Japan (Jan. 2004). (4) Y. Homma, Y. Kobayashi, J. Lefebvre, and P. Finnie, gSuspended Carbon Nanotube Architectures: Growth Control and Optical Propertiesh, International Symposium on the Creation of Novel Nanomaterials (ISCNN'04)h, Toyonaka, Japan (Jan. 2004) (5) E. Kohn, A. Aleksov, M. Kubovic, A. Denisenko, and M. Kasu, gDiamond electronic devices - opportunities and obstaclesh, 9th International Conference on New Diamond Science and Technology, Tokyo, Japan (Mar. 2004). (6) Y. Homma, gStandardization of SIMS depth profiling in ultra-shallow regionh, 1st International Symposium on Standard Materials and Metrology for Nanotecnology (SMAM-1), Tokyo, Japan (Mar. 2004) (7) K. Torimitsu, gNano-bio science: from molecule to nano-bio deviceh, Chinese Chemical Society & 24th CCS Congress, Hunan, China (Apr. 2004). (8) K. Torimitsu, N. Kasai and Y. Furukawa, gEffect of magnesium on neural ativities in cultured rat cortical and hippocampal neuronsh, 8th European Magnesium Conf., Romania, Italy (May, 2004). (9) C. Han and K. Torimitsu, gNeuronal cell death and sprouting of mossy fibers are induced by kanic acid exposure in rat hippocampal slice culturesh, The 3ed International Symposium on Neuroscience of Young Scholarsh, Guangzhou, China (Jun. 2004). (10) Y. Homma, gTowards standardization of ultra-shallow depth profiling: Multiple delta layers as a measure of depth scaleh, 16th International Vacuum Congress, Venice, Italy (Jun. 2004) (11) K. Torimitsu, gBioinfomaticsh, The 19th UK-Japan High Technology Industry Forum, Bristol, UK (Jul. 2004). (12) K. Torimitsu, Y. Furukawa, H. Nakashima, K. Furukawa, Y. Kashimura and W. Hu, gNanoBio Science - Neural functions and moleculesh, ICCE-11, Hilton Head Island, USA (Aug. 2004). (13) T. Makimoto and K. Kumakura, gRecent Development of Nitride Heterojunction Bipolar Transistorsh, 2004 ECS Joint Meeting in Hawaii, Honolulu, USA (Oct. 2004). (14) Y. Watanabe, S. Suzuki, Y. Homma, S. Heun, and A. Locatelli, gSPELEEM observation of individual single-walled carbon nanotubesh, 3rd Int. Workshop on Nanoscale Spectrosc. Nanotech., Maryland, USA (Dec. 2004).