Development of an optical lattice clock
    − Toward the next-generation atomic clock −

Accurate quantification for the environmental pollutants at trace levels
    − Accurate quantification using 13C-labeled internal standards −

Accurate measurement of the volume of silicon spheres
    − Interferometeric determination of the sphere volume for the redefinition of the kilogram based on an atomic mass −

DNA quantitation by isotope-dilution mass spectrometry
    − Development of method for accurate quantitation of DNA and the application to the development of DNA reference material −

Octave-spanning optical frequency comb using mode-locked fiber laser
    − Fiber comb −

Magnetic levitation densimeter for PVT property standard