• The Journal of Society for e-Business Studies
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• v.26 no.3
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• pp.21-32
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• 2021

Due to the recent development in electronic financial services, transactions of electronic prepayment are rapidly increasing. The increased transactions of electronic prepayment, however, also leads to the increased fraud attempts. It is mainly because electronic prepayment can easily be converted into cash. The objective of this paper is to develop a methodology that can effectively detect fraud transactions in electronic prepayment, by using sequential pattern mining techniques. To validate our approach, experiments on real transaction data were conducted and the applicability of the proposed method was demonstrated. As a result, the accuracy of the proposed method has been 95.6 percent, showing that the proposed method can effectively detect fraud transactions. The proposed method could be used to reduce the damage caused by the fraud attempts of electronic prepayment.

• Korean Journal of Mathematics
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• v.29 no.2
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• pp.409-424
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• 2021

In this paper, we investigate a pricing model for mortgage-backed securities (MBSs) of a pay-through type of collateral mortgage obligation (CMO), embedded call options, which can be exercised by the intermediary, and pass-through MBSs. We suggest a prepayment-risk-neutral pricing model, applying a reduced-form prepayment rate model, and then compute and investigate the appropriate prices and spreads in the coupon rates between CMOs and PT MBSs. We believe that this study contributes in that it provides a sophisticated pricing model for MBSs, especially to the financial markets which are not advanced enough to finance with a simple type of MBSs.

• The Journal of Society for e-Business Studies
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• v.27 no.2
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• pp.65-77
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• 2022

Due to the recent development in electronic financial services, transactions of electronic prepayment are rapidly growing, leading to growing fraud attempts. This paper proposes a methodology that can effectively detect fraud transactions in electronic prepayment by machine learning algorithms, including support vector machines, decision trees, and artificial neural networks. Actual transaction data of electronic prepayment services were collected and preprocessed to extract the most relevant variables from raw data. Two different approaches were explored in the paper. One is a transaction-based approach, and the other is a user ID-based approach. For the transaction-based approach, the first model is primarily based on raw data features, while the second model uses extra features in addition to the first model. The user ID-based approach also used feature engineering to extract and transform the most relevant features. Overall, the user ID-based approach showed a better performance than the transaction-based approach, where the artificial neural networks showed the best performance. The proposed method could be used to reduce the damage caused by financial accidents by detecting and blocking fraud attempts.

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.202-203
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• 2017

• Journal of the Korean Regional Science Association
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• v.31 no.4
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• pp.91-105
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• 2015

Mortgage-Backed Securities (MBS) was introduced in 1999 in order to stabilize housing market and prevent potential speculation. However, research on MBS is limited, so this paper try to narrow the gap by focusing on the factors relating the pre-payment risk of MBS. We used Granger Causality Validation, Vector Auto Regressive, and HP-filtering with time-series data from 2004 to 2014. This paper shows that the prepayment rate of MBS increases as Mortgage rate decreases because borrowers tend to refinance existing MBS with new lower-rate MBS. In addition, it reveals that the rate increases as housing price increases. This outcome support the hypothesis that introduction of low-rate MBS invites more investment or speculation, and hence the housing price rises. The relationship between the MBS pre-payment rate and housing price is yet a peculiar characteristic of the MBS in Korea.

• The Korean Journal of Financial Management
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• v.22 no.1
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• pp.147-179
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• 2005

It is frequently said that mortgage-backed securities (MBS) of different security designs are issued in an attempt to meet the varying needs and expectations of investors. If this is true indeed, MBS of complicated risk-return characteristics are likely to be priced higher than MBS of simple risk-return characteristics we. We test this implication by establishing a recombining binomial interest rate prepayment model with a burnout effect embedded. More specifically, we compare the relative values (utilities) of a pass-through and a PAC- Support collateralized mortgage obligation(CMO), and theoretically show why and how the CMO is more highly valued than is the pass-through. The model is established such that mortgage prepayment is a function of the current value of, and the past path of, the mort-gage market rate. Since we work on not the total value of the two MBS but the value of each tranche of either MBS, the test results could be robust to slightly different versions of similar tests, which may be done in the future.

• The Journal of Korean Medicine
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• v.36 no.3
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• pp.111-125
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• 2015

Objectives: The purpose of this study was to analyze the current cases of oriental medical injury relief data from Korea Consumer Agency (KCA), and to report the current change of oriental medical disputes pattern. Methods: Oriental medical injury relief cases processed by KCA from January 2010 to February 2015 were collected and analyzed. Results: 149 Oriental medical injury relief cases from KCA were analyzed for the study. The highest number that had been relieved was 43 in 2014. In monthly status, 18 case in September was The highest. According to the record, the bigger city had the bigger amount of relief cases which was 53(Seoul), 43(Gyeng-gi), 11(Busan) and so on. In age categories, 30s had the highest number of injury relief cases. The injury relief cases of package program had been rapidly increasing since 2013. Cancellation was the dominant claims cause of package program and consumer required the refund of prepayment. Breast augmentation was the majority treatment type of injury relief cases of package program. Average prepayment of package program was \3,166,085. Conclusions: This study finded that the major cause of oriental medical dispute was changed from side effect of clinical treatment to patient's satisfaction of medical service.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.60
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• pp.195-209
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• 2013

South Korea, despite the financial turbulences has marked the trade volume of USD 1 trillion and marked $7^{th}$ largest exporter in 2013. Approximately 40% of the entire import of Korea was for export. In the South Korean trade structure, import and export are closely related, requiring proactive import financial assistance policies. Recognizing this, K-sure has made import insurance policy available on the market since July 2010. The K-sure insurance policy targets both financial institutions and importers. This is the reason why this research seeks to review the import insurance terms for importers and compare with foreign import insurance products to find out ways to improve. K-sure's import insurance for importers is to cover a loss of a policyholder when the policyholder or importer domestically addressed made a prepayment but cannot receive goods. The import insurance is applied to import transactions of goods or resources. K-sure's import insurance coverage needs to be expanded to intermediary trade and consignment processing trade, etc. In this sense, a more systematic educational program should be introduced about K-sure's import insurance.

• Proceedings of the KIEE Conference
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• 2000.11d
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• pp.644-646
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• 2000

According to the deregulations of governments in the world. the power industries of United State and European nations are proceeding remote meter reading and remote load control. But the core technology of multifunctional electronic meter implemented by programmable one-chip IC, which can be the right answer of all the power industy's efforts is now still under development in the advanced countries. Implementation of smallest size, lowest price single-phase meter with features which enable distribution automation such as bidirectional communication, Remote load control, remote meter reading, remote credit assigment. Prepayment billing system.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2039-2041
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• 2001

According to the deregulation of governments in the world, the power industries of United State and European nations are proceeding remote meter reading and remote load control. But the core technology of multifunctional electronic meter implemented by programmable one-chip IC, which can be the right answer of ail the power industy's efforts is now still under development in the advanced countries. Implementation of smallest size, lowest price three-phase meter with features which enable distribution automation such as bidirectional communication. The three phase metering IC and meter can be used as metering, automatic meter reading and transformer monitoring. Prepayment billing system.