js_loop_pc_ym_v1_20180304-2_Earth_AMIPII_T21L26.sh
  main job script
js_loop.log
  log file
  actually, name of this file is arbitrary
  just a redirection of standard out/error of the main job script
js_loop_chktime.rb
js_loop_chktime.restart_time
js_loop_current
  three numbers
    1st line: loop number
    2nd line: year and month of current time
js_loop_integ_time
  two numbers which represent year and month of end of simulation
js_loop_limit
  last loop number

