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Hyunjun Jung
Department of Software Convergence Engineering, Kunsan National University, Gunsan 54150, Korea

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Journal article
Published: 18 May 2021 in Future Internet
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Central Bank Digital Currency (CBDC) is a digital currency issued by a central bank. Motivated by the financial crisis and prospect of a cashless society, countries are researching CBDC. Recently, global consideration has been given to paying basic income to avoid consumer sentiment shrinkage and recession due to epidemics. CBDC is coming into the spotlight as the way to manage the public finance policy of nations comprehensively. CBDC is studied by many countries. The bank of the Bahamas released Sand Dollar. Each country’s central bank should consider the situation in which CBDCs are exchanged. The transaction of the CDDB is open data. Transaction registers CBDC exchange information of the central bank in the blockchain. Open data on currency exchange between countries will provide information on the flow of money between countries. This paper proposes a blockchain system and management method based on the ISO/IEC 11179 metadata registry for exchange between CBDCs that records transactions between registered CBDCs. Each country’s CBDC will have a different implementation and time of publication. We implement the blockchain system and experiment with the operation method, measuring the block generation time of blockchains using the proposed method.

ACS Style

Hyunjun Jung; Dongwon Jeong. Blockchain Implementation Method for Interoperability between CBDCs. Future Internet 2021, 13, 133 .

AMA Style

Hyunjun Jung, Dongwon Jeong. Blockchain Implementation Method for Interoperability between CBDCs. Future Internet. 2021; 13 (5):133.

Chicago/Turabian Style

Hyunjun Jung; Dongwon Jeong. 2021. "Blockchain Implementation Method for Interoperability between CBDCs." Future Internet 13, no. 5: 133.

Journal article
Published: 31 March 2021 in The Journal of Korean Institute of Information Technology
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블록체인 환경에서 트릴레마 문제로 불리는 분산성•보안성•확장성을 동시에 만족시키는 것은 어려운 문제이다. 블록체인들은 트릴레마 문제를 위해 많은 합의 알고리즘를 제안한다. 보안성이 높은 작업증명(Proof-of-Work)은 ASIC 채굴기의 등장으로 분산성이 훼손되었다. 몇몇 블록체인은 ASIC 저항 알고리즘을 개발하였다. 우리는 ASIC 채굴기의 등장을 억제하기 위하여 LDPC 디코더와 해시 함수를 결합한 오류-정정 부호 기반의 작업증명(Error-Correction Codes Proof-of-Work, ECCPoW)를 제안하였다. 그리고 ECCPoW를 구현하는 방법을 제안하였다. 이 논문은 ECCPoW의 코어 1.0 버전에 대하여 설명하고 이더리움 환경에 적용하는 방법을 제안한다. 그리고 우리는 ECCPoW가 적용된 이더리움과 기존의 이더리움(Ethash)의 확장성을 평가한다.

ACS Style

Hyunjun Jung; Heung-No Lee. ECCPoW Blockchain Implementation Method for Ethereum Environment. The Journal of Korean Institute of Information Technology 2021, 19, 61 -70.

AMA Style

Hyunjun Jung, Heung-No Lee. ECCPoW Blockchain Implementation Method for Ethereum Environment. The Journal of Korean Institute of Information Technology. 2021; 19 (3):61-70.

Chicago/Turabian Style

Hyunjun Jung; Heung-No Lee. 2021. "ECCPoW Blockchain Implementation Method for Ethereum Environment." The Journal of Korean Institute of Information Technology 19, no. 3: 61-70.

Journal article
Published: 30 July 2020 in The Journal of Korean Institute of Information Technology
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CBDC(Central Bank Digital Currency)란 중앙은행에서 발행하는 디지털 화폐를 말한다. 국가들은 금융위기를 겪고 현금 없는 사회를 대비하여 CBDC를 연구하였다. 최근 전 세계는 전염병으로 인해 소비심리가 위축되고 경기 침체를 피하고자 기본소득을 지급을 고려하고 있다. 국가의 재정정책을 정교하게 운용할 방법으로 CBDC가 다시 한 번 주목받고 있다. 많은 나라는 CBDC를 연구하고 있으며 특히 중국은 발행을 적극적으로 검토 중이다. 중앙은행은 여러 나라의 CBDC가 발행되고 교환하는 상황을 고려해야 한다. 이 논문은 CBDC 간의 교환을 위한 ISO/IEC 11179 메타데이터 레지스트리 기반의 블록체인 시스템을 제안한다. 각 나라의 CBDC는 구현방식과 발행 시기가 다를 것이다. CBDC에 대한 공통된 표현을 위하여 우리는 ISO/IEC 11179 메타데이터 레지스티리 기반 표현방법과 관리하는 방법을 제안한다. 이 논문에서는 등록되어있는 CBDC 간의 거래를 기록하는 블록체인 시스템을 제안한다. 그리고 우리는 블록체인 시스템을 구현하고 동작 방법을 실험한다. 마지막으로 제안방법과 암호화폐 거래소(중앙화 방식, 탈중앙화 방식)를 비교한다.

ACS Style

Hyunjun Jung. ISO/IEC 11179-based Blockchain System for Exchange Between CBDCs. The Journal of Korean Institute of Information Technology 2020, 18, 43 -50.

AMA Style

Hyunjun Jung. ISO/IEC 11179-based Blockchain System for Exchange Between CBDCs. The Journal of Korean Institute of Information Technology. 2020; 18 (7):43-50.

Chicago/Turabian Style

Hyunjun Jung. 2020. "ISO/IEC 11179-based Blockchain System for Exchange Between CBDCs." The Journal of Korean Institute of Information Technology 18, no. 7: 43-50.

Journal article
Published: 30 June 2020 in The Journal of Korean Institute of Information Technology
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비트코인은 네트워크에 참여해 금융기관과 같은 제 3자 개입없이 온라인 송금하고 채굴을 하여 보상을 받는다. 비트코인 채굴은 작업증명(Proof-of-Work)을 통해 이뤄지며 작업증명 특성상, 높은 해시 레이트를 가질수록 채굴 확률이 높아진다. 그래서 채굴 조직이라고 불리는 채굴 풀의 등장, CPU/GPU와는 달리 비용과 성능효율성이 좋은 ASIC 채굴기 등장을 일으켰다. 문제는 이렇게 얻은 해시 레이트로 인해 비트코인의 채굴 독점문제와 이중 지불 공격 위험에 노출된다. 우리는 ASIC 채굴기의 등장을 해결하기 위해 LDPC 디코더와 해시함수를 결합한 오류-정정 부호 기반의 작업증명(Error-Correction Codes Proof-of-Work, ECCPoW)을 제안하였다. 이 논문은 ECCPoW의 구현방법에 대하여 제안하고 비트코인의 작업증명을 ECCPoW로 교체했다. 마지막으로 제안방법을 비트코인과 채굴 중앙화 측면에서 비교 평가한다.

ACS Style

Hyunjun Jung; Jong-Hong Chae; Heung-No Lee. Blockchain Implementation Method of Error-Correction Code Based Proof-of-Work for ASIC Resistance. The Journal of Korean Institute of Information Technology 2020, 18, 33 -42.

AMA Style

Hyunjun Jung, Jong-Hong Chae, Heung-No Lee. Blockchain Implementation Method of Error-Correction Code Based Proof-of-Work for ASIC Resistance. The Journal of Korean Institute of Information Technology. 2020; 18 (6):33-42.

Chicago/Turabian Style

Hyunjun Jung; Jong-Hong Chae; Heung-No Lee. 2020. "Blockchain Implementation Method of Error-Correction Code Based Proof-of-Work for ASIC Resistance." The Journal of Korean Institute of Information Technology 18, no. 6: 33-42.

Journal article
Published: 09 June 2020 in Symmetry
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Bitcoin is the first cryptocurrency to participate in a network and receive compensation for online remittance and mining without any intervention from a third party, such as financial institutions. Bitcoin mining is done through proof of work (PoW). Given its characteristics, the higher hash rate results in a higher probability of mining, leading to the emergence of a mining pool, called a mining organization. Unlike central processing units or graphics processing units, high-cost application-specific integrated circuit miners have emerged with performance efficiency. The problem is that the obtained hash rate exposes Bitcoin’s mining monopoly and causes the risk of a double-payment attack. To solve this problem, we propose the error-correction code PoW (ECCPoW), combining the low-density parity-check decoder and hash function. The ECCPoW contributes to the phenomenon of symmetry in the proof of work (PoW) blockchain. This paper proposes the implementation of ECCPoW, replacing the PoW in Bitcoin. Finally, we compare the mining centralization, security, and scalability of ECCPoW and Bitcoin.

ACS Style

Hyunjun Jung; Heung-No Lee. ECCPoW: Error-Correction Code based Proof-of-Work for ASIC Resistance. Symmetry 2020, 12, 988 .

AMA Style

Hyunjun Jung, Heung-No Lee. ECCPoW: Error-Correction Code based Proof-of-Work for ASIC Resistance. Symmetry. 2020; 12 (6):988.

Chicago/Turabian Style

Hyunjun Jung; Heung-No Lee. 2020. "ECCPoW: Error-Correction Code based Proof-of-Work for ASIC Resistance." Symmetry 12, no. 6: 988.

Journal article
Published: 25 October 2018 in Sensors
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A sensor registry system (SRS) registers sensor metadata and provides them for a seamless semantic process. Recently, network coverage information-based SRS (NC-SRS) was developed to provide sensor information filtering by combining path prediction and network coverage checks. However, the NC-SRS has problems caused by issues such as termination of OpenSignal service and pre-building road segments. Therefore, this paper proposes a sensor registry system-based predictive information service (SRS-PIS) using a grid. SRS-PIS predicts a path based on the grid, checks the network coverage, and filters the sensor. This paper presents a grid-based real-time path prediction algorithm and an algorithm for grouping network service-disabled areas. To obtain network coverage information, we constructed and implemented a grid-based coverage map through experiment to measure the signal strength. As an evaluation, we compared features among SRS-based systems and SRS-PIS, and compared advantages and disadvantages between segment-based and grid-based methods.

ACS Style

Hyunjun Jung; Dongwon Jeong; Sukhoon Lee. Development of Sensor Registry System-Based Predictive Information Service Using a Grid. Sensors 2018, 18, 3620 .

AMA Style

Hyunjun Jung, Dongwon Jeong, Sukhoon Lee. Development of Sensor Registry System-Based Predictive Information Service Using a Grid. Sensors. 2018; 18 (11):3620.

Chicago/Turabian Style

Hyunjun Jung; Dongwon Jeong; Sukhoon Lee. 2018. "Development of Sensor Registry System-Based Predictive Information Service Using a Grid." Sensors 18, no. 11: 3620.

Journal article
Published: 31 March 2018 in The Journal of Korean Institute of Information Technology
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ACS Style

Hyunjun Jung; Sukhoon Lee; Dongwon Jeong. Improving Path Prediction Using Grid for Sensor Registry System. The Journal of Korean Institute of Information Technology 2018, 16, 1 -10.

AMA Style

Hyunjun Jung, Sukhoon Lee, Dongwon Jeong. Improving Path Prediction Using Grid for Sensor Registry System. The Journal of Korean Institute of Information Technology. 2018; 16 (3):1-10.

Chicago/Turabian Style

Hyunjun Jung; Sukhoon Lee; Dongwon Jeong. 2018. "Improving Path Prediction Using Grid for Sensor Registry System." The Journal of Korean Institute of Information Technology 16, no. 3: 1-10.