Purpose In Korea and abroad, this paper investigates the use of blockchains in the financial sector. This study aims to examine how blockchains are applied to the financial sector and how to respond to the Korean conditions. Design/methodology/approach This paper investigates the movements of the financial sector and related services using the blockchain in the current market. Findings First, as a result of examining domestic and foreign cases, it can be seen that the areas where blockchains are most actively applied in the financial sector are expanding into settlement, remittance, securities and smart contracts. Also, in Korea, many of the authentication procedures based on the equipment possessed by the consumers are used so that introduction of the blockchain in the authentication part is prominent. Second, the move to introduce a closed (private) distributed ledger that does not go through the central bank is accelerating in payments between banks. Third, domestic financial institutions also need joint action by financial institutions through a blockchain consortium to apply blockchain technology to the financial sector. Fourth, consumer needs and technological developments are changing. At the same time, as the opportunity to infringe on the information held by individuals has expanded, the need for blockchain technology is strongly emerging because of the efforts of the organizations to defend it. Originality/value This paper contributes to understanding the changes in the financial sector using the blockchain.

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Abstract. Never before has data received so much attention from every corner of the world. In order to further explore the Big Data industry, we study business models of Big Data in this paper. The study identifies 15 different cases that are spread across three development stages: introduction, growth, and mature stages. In the introduction stage, companies that hold data engage in the data providing business. Public agencies and large companies gain access to new data resources. In the growth stage, companies deliver solutions based on data analysis. In the mature stage, companies that hold data develop direct services and deliver the unique services to consumers with different needs. We identified the direction and development of the Big Data industry through an understanding of these models. This paper contributes to the revitalization of the business industry by informing government policy.

In this paper, we introduce "the supplier management and approval in reverse trade card", a new electronic payment system for the B2B market. This study is about a new transaction system that allows purchasing companies to share the supplier's credit to buy products through the SMART(supplier management and approval in reverse trade) card. This model will change the paradigm, increase the diversity of electronic payment methods, increase the sales revenue for the seller, and eliminate the cost of collecting money from the buyer due to the involvement of the credit card firm. The SMART card system will diversify the electronic payment methods, and provide an option that can benefit both supplying and purchasing company financially. The area of further study concerns the application of the SMART card in regards to the suppliers receiving payment, the purchasers paying through credit and the overall affect on the B2B market.

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