diff --git a/topics.txt b/topics.txt
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+1. create steps csv file by HiNC.
+2. calculate temperature and other custom information by excel. 
+3. Show those information in HiNC.
+
+
+
+
+formula
+=ABS(AC3)*(D3-D2)*para!B$8-(AO2-para!B$1)*para!B$5*0.001*para!B$2*(D3-D2)
+=AN3/(para!B$6*(0.001*para!B$7))+AO2
+=IF(OR(ABS(AL3)>1000,ABS(AJ3)>30),1,0)
+
+para
+normal temperature (K)	300	
+heat transfer coefficient (W/mK)	58	(WC, 28~88)
+cutter D (mm)	12	
+cutter H (mm)	40	
+cutter intersected area/height (mm)	2.827433388	
+heat capacity (J/kgK)	240	(WC, 184~292)
+local cutter weight (g)	0.07	(full cutter weight is 7)
+heat conduct ratio from cutter to total	0.05