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Financial Technology API 활용 통합계좌 잔액 알림 서비스 모바일 어플리케이션
이효성(HyoSeong Lee),이주환(JuHwan Lee),이택(Taek Lee),장기성(GiSeong Jang),이정휴(JungHue Lee),유철중(Cheol-Jung Yoo) 한국정보기술학회 2020 Proceedings of KIIT Conference Vol.2020 No.10
오픈뱅킹(Open banking) 기술이 등장한 이후로 사용자는 한 가지 금융 모바일 어플리케이션으로 모든 계좌정보에 대한 잔액을 확인할 수 있게 되었다. 기존 시장에 나와 있는 관련 금융 어플리케이션에서는 여러 계좌를 등록하고 통합잔액을 알려주는 기능을 제공하지만 수동으로 계좌정보를 확인해야 한다는 단점이 있었다. 프로젝트에서는 위의 오픈뱅킹 기술을 이용하여 여러 계좌의 잔액을 보여주는 통합잔액 조회 기능을 구현하였고, 수동적으로 어플리케이션에 접근해야 한다는 단점을 해결하기 위해 위젯 기능을 활용하여 어플리케이션을 실행하지 않고 실시간으로 계좌의 잔액을 확인할 수 있는 기능을 구현하였다. Since the advent of open banking technology, users have been able to check the balance of all accounts with one bank mobile application. Related banking applications in the existing market offer the ability to register multiple accounts and inform the integrated balance, but they had the disadvantage of having to check account information manually. The project implemented an integrated balance inquiry function that shows the balance of multiple accounts using the open banking technology above, and a function that allows users to check the balance of accounts in real time without running the application by utilizing the widget function to address the disadvantage of passive access to the application.
Optimal Design of Gerotor Profile with Lemniscate Lobe Shape for Noise Reduction
Changhyun Lee,Hyoseong Jang,곽효서,Gunyoung Park,김철 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.9
Since gerotor oil pump has a simple structure and has a higher discharge per cycle than other types of pumps with the same size, it has advantage for miniaturization, so it is widely used as the source of lubricant for engine lubrication of automobiles or as the hydraulic source of automatic transmissions. In order to improve the fuel efficiency and reduce the noise of gerotor oil pumps, optimization of the tooth profile is required. Thus, in this study, 2-Ex_Lemniscates; 2-expanded lemniscates curve, was developed as a new lobe shape, and theoretical equations for generating a rotor profile used as the tooth profile of the outer rotor were derived. In addition, new algorithm has removed ‘cusp’ generated in outer rotor and made uniform clearance between outer and inner rotors by applying translational movement of the x and y axes along with the expansion and rotation, and using automatic design program, optimal profile was proposed based on the analysis of performance parameters for about 2.6 million tooth profiles. The experimental results showed that the developed 2-Ex_Lemniscates oil pump showed that the flow rate at 2500 rpm was increased by about 2.9%, and average SPL (2000–3000 rpm) and pressure irregularity were decreased by 3.3% and 16.9%, respectively.
Leakage analysis of helical grooved pump seal using CFD
Seongjun Woo,Hyoseong Jang,Hyoseo Kwak,문영훈,김철 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
The helical grooved seal, which is a non-contact sealing device using the viscosity of the fluid, prevents leakage by reducing fluid pressure according to the shapes of the rotor and stator. It has been widely adopted to turbomachinery because no wear deliveries high efficiency, unlike to the existing contact sealing device. In this study, parametric study was performed by CFD analysis, considering helical grooved seal shape: ratio of groove width and land width (w ratio ), helical angle (β) and groove depth (d). Based on the leakage characteristics analyzed through CFD results, improved seal shape of the helical grooved seal to reduce leakage was suggested.
Design of composite layer and liner for structure safety of hydrogen pressure vessel (type 4)
Gunyoung Park,Hyoseong Jang,김철 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.8
Due to the problems of fossil fuel exhaustion and environmental pollution, the use of hydrogen fuel has been increasing gradually, so there is also need of commercialization of hydrogen fuel cell vehicle. In order to increase its fuel efficiency, light-weightning and structural design, which are to optimize thickness and shape of the pressure vessel (end closure and boss) and winding angle of composite, have been required. This study has carried out as follows to obtain structural safety of hydrogen pressure vessel (type 4) under working pressure (700 bar). Plastic liner was designed using dome shape with isotensoid curve and spherical shape not to slip in the dome region while filament winding. After calculating the initial thickness of composite by netting theory, the composite thickness in both cylinder and dome parts to satisfy structural safety were obtained by FEM, changing the thicknesses calculated from theory. Also, optimal design of aluminium boss shape was performed using the response surface method to achieve light-weightning and increase of inner capacity. Based on the above results, structural safety of the optimal hydrogen pressure vessel (type 4) with the composite layer and boss shape finally determined was verified through FEA.