Deputy Prime Minister ACM Prajin Juntong who presided over the expo in Khon Kaen on Oct 6 said he was highly confident Khon Kaen would become a good model for other provinces in establishing a smart cityPublished caption : A model for others: Deputy Prime Minister ACM Prajin Juntong presides over the Smart City Expo 2018 in Khon Kaen on Oct 6.