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Oh's 8-Universality Criterion is Unique
Kominers, Scott Duke Department of Mathematics 2021 Kyungpook mathematical journal Vol.61 No.3
We partially characterize criteria for the n-universality of positive-definite integer-matrix quadratic forms. We then obtain the uniqueness of Oh's 8-universality criterion [11] as a corollary.
小峯茂嗣(Komine Shigetsugu) 동북아시아문화학회 2016 동북아시아문화학회 국제학술대회 발표자료집 Vol.2016 No.10
Since the cease-fire of Korean War in 1953, even now, civilians of South-Korea have been victimized by landmine accidents. However, their existence had been hidden under the modern history. In 1997, International Campaign to ban Landmines (ICBL) was awarded Novel Peace Prize. Since then, South-Korean civil societies have started action to reveal this problem. Their continuous effort finally realized the special law to compensate landmine victims. North-South division is under the strong influences of “Super Powers” like USA, China and Russia. So, the landmine victimizations are not only the tragedy of individuals but also they are the victims of the North-East Asian international power politics.
Design and Development of an Open Architecture CNC Controller for Milling Machine Retrofitting
Kittipong Ekkachai,Udom Komin,Wuttikorn Chaopramualkul,Apicit Tantaworrasilp,Phanuphan Kwansud,Pongsakorn Seekhao,Teesid Leelasawassuk,Kamonwan Tanta-Ngai,Kanokvate Tungpimolrut 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Most Computer Numerical Control (CNC) machines used in Thai industry are imported. With regular maintenance, these CNC machines could last up to 10 years. After that, the owners would either purchase a new machine or upgrade the old model; the later process is widely known as “retrofitting.” However, purchasing a new CNC machine is a big financial burden for small-to-medium enterprises (SMEs) whereas retrofitting usually do not cost much less because most CNC machines are developed based on closed technology. In addition, many models are discontinued after 10 years of service making retrofitting even more costly or nearly impossible. Such problem also permeates educational institutes such as Thai Vocational Technical Colleges, which usually own 5-10 CNC milling and turning machines per institute; that amounts to 400 machines in total that need retrofitting after 10 years of usage. Most of these machines require new industrial motion control cards which had been long discontinued. Hence, an industrial grade CNC motion control prototype system based on open architecture and modular technologies has been developed as a pioneer research project for retrofitting old milling machines for Vocational Technical Colleges.
Zhao, Chao Fang,Komine, H.,Akiyama, M.,Sugimori, Y.,Matsuura, N. 대한원격탐사학회 1996 International Symposium on Remote Sensing Vol.12 No.1
The WAM (WAve Modeling) model, as one of the best wave models used in the world, has been used for wave data assimilation, SAR data verification and wave forecasting on global and regional scales. In this study, an experiment of the wave model comparison is carried out around Japan Island by using WAM wave model and Japan Meteorological Agency wave model (JWA3G). Both of these two model results are compared with the Ocean Buoy Station around Japan, which are operated by Japan Meteorological Agency. Compared with WAM model, wind input and dissipation have been modified in JWA3G model. Wind input data used in both wave model are the interpolated result with 0.5x0.5 degree grid by using ECMWF wind data with spatial resolution of 2.5x2.5 degree. The main results can be summaried as follows, (I). Compared with buoy data, the predicted wave height from both models are delayed several hours in typhoon period. This result is consistent with wind data difference between buoy data and the predicted wind data by ECMWF. (2). The predicted wave height by both models give a consistent result around typhoon period. (3). In low sea state, the result from WAM model gives a much better result than that from JWA3G model by comparing with buoy data.