l ̂ εil B ⋅ δe il + ̂ ug i ba − 1 ⋅ ∑ m ˜ wim + ̂ uri ba − 1 ⋅ ∑ n ˜ wni ˜ wij = ∑ k wijk wijk = μk ⋅ (exp{ln(CP ⋅ 365 / δb k ) ⋅ (1 − γij )} − 1) μk = ln(priceb k ) (if 0 < priceb k AND bk is gave) priceb k (if 0 < priceb k AND bk is received) 1 (otherwise) δb k = ⌊ tcurrent − tb k 86400 ⌋ (if CP < δb k ) 1 (otherwise) γij = σij ( δe ij ̂ εij + B ⋅ ̂ kij ) σij (x) = tanh ( x x + 1) δe ij = ⌊ tcurrent − te′ ij 86400 ⌋ (if 0 < δe ij ) 1 (otherwise) 5SVTUTDPSF 1SPPGPG.ZMJGF 1P. bajji score 17 bsi : bajji score of Ai (Ai : accounti ) B : bajji constant (B = 8.8) CP : bajji critical point (CP = 88) εa : thetotalnumberofencountershappened ba : thetotalnumberof bajjigiven /receivedbywholeusers ̂ ug i : Number of unique users who gave the bajji ̂ uri : Number of unique users who received the bajji ˜ wij : Sum of the value of the bajji sent from Ai to Aj wijk : Value of the bajji(k) sent from Ai to Aj priceb k : Price of the bajji(k) tcurrent : Current datetime [sec] ̂ εij : Number of encount bet ween Ai and Aj ̂ kij : Number of bajji send Ai to Aj tb k : Datetime the bajji(k) was created [sec] te′ ij : Datetime of the last encount bet ween Ai and Aj [sec] γij : Attenuation rate bet ween Ai and Aj δb k : Dif ference day bet ween current date and the bajji(k) created at δe ij : Number of days since the last encounted bet ween Ai and Aj ਓͷߦಈ͕ੵ͞ΕɺϒϩοΫνΣʔϯʹࠁ·Ε·͢ ͦΕΛͱʹ৴པείΞɺCBKKJείΞΛࢉग़͠·͢ ͦΕΛ1SPPGPG.ZMJGFͱಡΜͰ͍·͢
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