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( Jinhyeok Jang ),( Restu Karlina Rahayu ) 부경대학교 글로벌지역학연구소 2020 Journal of Global and Area Studies(JGA) Vol.4 No.2
This research examines the preference structure for economic growth vs. environmental protection among Indonesians. For this purpose, we employed data from the fourth wave of the Asian Barometer Survey. In contrast to the conventional wisdom, we found that Indonesians prefer environmental protection to economic growth. We further identified that religiosity, ethnicity, and rural development are associated with the individual survey respondent’s preference pattern.
Modeling Non-Stationary Asymmetric Lens Blur by Normal Sinh-Arcsinh Model
Jinhyeok Jang,Joo Dong Yun,Seungjoon Yang IEEE 2016 IEEE TRANSACTIONS ON IMAGE PROCESSING - Vol.25 No.5
<P>Images acquired by a camera show lens blur due to imperfection in the optical system even when images are properly focused. Lens blur is non-stationary in a sense that the amount of blur depends on pixel locations in a sensor. Lens blur is also asymmetric in a sense that the amount of blur is different in the radial and tangential directions, and also in the inward and outward radial directions. This paper presents parametric blur kernel models based on the normal sinh-arcsinh distribution function. The proposed models can provide flexible shapes of blur kernels with a different symmetry and skewness to model complicated lens blur due to optical aberration in a properly focused images accurately. Blur of single focal length lenses is estimated, and the accuracy of the models is compared with the existing parametric blur models. An advantage of the proposed models is demonstrated through deblurring experiments.</P>
( Jinhyeok Jang ) 부경대학교 글로벌지역학연구소 2018 Journal of Global and Area Studies(JGA) Vol.2 No.1
This paper explores the potential of multi-dimensional politics in the Legislative Council (LegCo) of Hong Kong. The conventional understanding of Hong Kong’s elite politics is that the issues of democratization and its relationship to Mainland China have absorbed other potential issues. In contrast, this paper argues that other potential issues sometimes appear to be important in Hong Kong politics. To demonstrate this argument, I focus on the parliamentary questions of the LegCo members to the executive branch on the economic issue. The empirical analysis presents that the LegCo members’ ideology along the major cleavage has not related to parliamentary questioning on economic issue. Rather, the statistical result of the negative binomial regression presents that legislators who are less aligned with the China factor participate more actively in economic policy-making in the legislature. The structure of parliamentary politics is complex, and if we take an earlier legislative process seriously, a limited but considerable amount of diverse policy representation in Hong Kong could be observed.
Prediction of delamination of steel-polymer composites using cohesive zone model and peeling tests
Jang, Jinhyeok,Sung, Minchang,Han, Sungjin,Yu, Woong-Ryeol Elsevier 2017 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.160 No.-
<P><B>Abstract</B></P> <P>This study reports on the prediction of the delamination of steel-polymer composites. To characterize the adhesive properties from peeling tests, a simple model was derived based on peeling mechanics, in particular considering plastically dissipated energy of polymer film due to bending. Peeling tests were performed at two angles so that the adhesive properties were determined in both normal and tangential directions. Then, peel strength at arbitrary angle was predicted and compared with experiments, showing that the peel strength at only two angles and peeling mechanics considering the bending of polymer film can accurately describe the adhesive properties of steel-polymer interface. Finally, finite element simulations based on the cohesive zone model were performed to predict the delamination between steel-polymer sandwich composites, demonstrating the validity of cohesive zone model equipped with necessary properties determined using peeling tests and the developed model in this study.</P>
그래디언트 기반 재복원공격을 활용한 배치상황에서의 연합학습 프라이버시 침해연구
장진혁(Jinhyeok Jang),류권상(Gwonsang Ryu),최대선(Daeseon Choi) 한국정보보호학회 2021 정보보호학회논문지 Vol.31 No.5
최근 데이터로 인한 개인정보 침해로 인해 연합학습이 이슈화되고 있다. 연합학습은 학습데이터를 요구하지 않기 때문에 프라이버시 침해로부터 안전하다. 이로 인해 분산된 디바이스, 데이터를 활용하여 효율을 내기 위한 응용 방법에 대한 연구들이 진행되고 있다. 그러나 연합학습과정에서 전송되는 그래디언트로부터 학습데이터를 복원하는 재복원공격에 대한 연구가 진행됨에 따라 더는 연합학습도 안전하다고 볼 수 없다. 본 논문은 다양한 데이터 상황에서 데이터 복원 공격이 얼마나 잘되는지 수치적, 시각적으로 확인하는 것이다. 데이터가 1개만 존재할 때부터 크게는 클래스 안에 데이터가 여러 개 분포해 있을 때로 나누어 재복원공격이 얼마나 되는지 확인을 위해 MSE, LOSS, PSNR, SSIM인 평가지표로 MNIST 데이터를 활용해 수치로 확인한다. 알게 된 사실로 클래스와 데이터가 많아 질수록 MSE, LOSS,이 높아지고 PSNR, SSIM이 낮아져 복원성능이 떨어지지만 몇 개의 복원된 이미지로 충분히 프라이버시 침해가 가능하다는 것을 확인할 수 있다. Recently, Federated learning has become an issue due to privacy invasion caused by data. Federated learning is safe from privacy violations because it does not need to be collected into a server and does not require learning data. As a result, studies on application methods for utilizing distributed devices and data are underway. However, Federated learning is no longer safe as research on the reconstruction attack to restore learning data from gradients transmitted in the Federated learning process progresses. This paper is to verify numerically and visually how well data reconstruction attacks work in various data situations. Considering that the attacker does not know how the data is constructed, divide the data with the class from when only one data exists to when multiple data are distributed within the class, and use MNIST data as an evaluation index that is MSE, LOSS, PSNR, and SSIM. The fact is that the more classes and data, the higher MSE, LOSS, and PSNR and SSIM are, the lower the reconstruction performance, but sufficient privacy invasion is possible with several reconstructed images.