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Neural Networks Based Modeling with Adaptive Selection of Hidden Layer's Node for Path Loss Model
강창호,조성윤 사단법인 항법시스템학회 2019 Journal of Positioning, Navigation, and Timing Vol.8 No.4
The auto-encoder network which is a good candidate to handle the modeling of the signal strength attenuation is designed for denoising and compensating the distortion of the received data. It provides a non-linear mapping function by iteratively learning the encoder and the decoder. The encoder is the non-linear mapping function, and the decoder demands accurate data reconstruction from the representation generated by the encoder. In addition, the adaptive network width which supports the automatic generation of new hidden nodes and pruning of inconsequential nodes is also implemented in the proposed algorithm for increasing the efficiency of the algorithm. Simulation results show that the proposed method can improve the neural network training surface to achieve the highest possible accuracy of the signal modeling compared with the conventional modeling method.
인체 및 다양한 발효식품 유래 유산균의 충치유발 세균에 대한 항균활성 및 프로바이오틱스 기능성 연구
강창호,정율아,박혜민,김진성,김용경,한설화,백남수 한국생물공학회 2018 KSBB Journal Vol.33 No.4
The occurrence of dental caries is mainly associatedwith oral pathogens, especially cariogenic Streptococcusmutans and Porphyromonas gingivalis. The objective of thisstudy was to investigate antimicrobial activity against cariogenicassociated pathogens, acid tolerance, bile salt tolerance,and autoaggregation of 12 presumptive Lactobacillus spp. isolated from human and fermented foods. Five strains wereselected after qualitatively identifying high levels of antimicrobialactivity against bacteria including S. mutans. Resultsshow that selected strains survivability was tested in bile saltand acidic conditions to show their potential use as probioticsin the gastrointestinal tract. Indirect adhesion activity of selectedstrains measured by autoaggregation assay showed morethan 60% autoaggregation after 5 h standing. Further studiesare underway to demonstrate that the selected strains can beapplied as potential probiotics for recovering oral ecosystem.
Improvement of a Low Cost MEMS Inertial-GPS Integrated System Using Wavelet Denoising Techniques
강창호,김선영,박찬국 한국항공우주학회 2011 International Journal of Aeronautical and Space Sc Vol.12 No.4
In this paper, the wavelet denoising techniques using thresholding method are applied to the low cost micro electromechanical system (MEMS)-global positioning system(GPS) integrated system. This was done to improve the navigation performance. The low cost MEMS signals can be distorted with conventional pre-filtering method such as low-pass filtering method. However,wavelet denoising techniques using thresholding method do not distort the rapidly-changing signals. They can reduce the signal noise. This paper verified the improvement of the navigation performance compared to the conventional pre-filtering by simulation and experiment.
강창호,이현동,유재오 한국수자원학회 2001 한국수자원학회논문집 Vol.34 No.3
본 연구에서는 포항시 양덕정수장에 tracer test를 이용한 pilot plant를 설치하여 기존 플록형성지에 대한 문제점을 도출하였다. 또한 플록형성지 각단 유출부의 단면을 여러 가지 형태로 변경시키면서 수리학적 평가를 실시하였고, 그 결과 플록형성지의 각단 유출부에 대한 최적 개량단면을 제시하였고, plant에 적용하여 현재 운전중에 있다. 또한 입자의 크기별 개수를 측정할 수 있는 particle counter를 이용하여 플록형성지 개량후의 효 The problem of the flocculation basin was induced by installing the pilot plant using tracer test at Yang-Duck water treatment plant in Pohang cite. The flocculation basin model downscaled as 1/20 was made of acryl and evaluated hydraulically by transform
Isolation of Lactobacillus Strains from Shellfish for their Potential Use as Probiotics
강창호,신유진,김용경,소재성 한국생물공학회 2016 Biotechnology and Bioprocess Engineering Vol.21 No.1
Microorganisms intended for use as probiotics in aquaculture should exert antimicrobial activity and be regarded as safe not only for their aquatic hosts but also for their surrounding environments and humans. The objective of this work was to investigate antimicrobial activity against various pathogens, bile salt tolerance, and acid tolerance of 65 presumptive Lactobacillus spp. isolated from shellfish samples. Four strains (HL1, HL12, HL20, and JL28) were selected after qualitatively identifying high levels of antimicrobial activity against bacteria including Staphylococcus aureus, Salmonella typhimurium, Salmonella enteritidis, Escherichia coli O157:H7, Vibrio ichthyoenteri, Edwardsiella tarda, Streptococcus iniae, and V. parahaemolyticus. The sequence analysis of their 16S rRNA genes revealed that the four strains belong to the Lactobacillus plantarum species. In addition, their survivability was tested in bile salt and acidic conditions to show their potential use as probiotics in the gastrointestinal tract.