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신지윤(Jiyoon Shin),이정희(Jung-Hee Lee) 한국에너지기후변화학회 2021 에너지기후변화학회지 Vol.16 No.2
It is necessary to find ways to improve North Koreas power infrastructure in response to climate change. North Korea should adopt a power supply system consistent with sustainable development that can curb carbon emissions and ensure economic growth. South Korea needs a practical cooperation plan that can be positive to each other by utilizing North Korea while simultaneously promoting inter-Korean economic cooperation and its energy transition. Meanwhile, amid rising vulnerabilities to climate change in North Korea, calls for a global joint response to climate change are growing. North Koreas plan to improve its power infrastructure is thus asking what kind of power supply system and what kind of implementation system will be best from the perspective of climate change response. As a research method, a comparative analysis was used to see if the proposed power supply plan to North Korea from the perspective of South Korea corresponds to the priority of power-related policies shown in North Koreas Conditional NDC. In order to derive proposals from South Korea, (1) objectified North Koreas electricity and climate crisis situation based on North Koreas VNR, (2) reinterpreted existing studies on North Koreas electricity supply by energy source by reflecting recent economic analysis and climate finance conditions, and (3) went through a process of exploring improvements related to the implementation system focusing on case analysis. As a result of the study, it is desirable to divide the power supply system to North Korea into three. First, it is a small-scale renewable energy supply for home that would be possible in the short term due to the nature of humanitarian aid. Second, it is support for the maintenance and repair of the power system corresponding to the reduction of the loss rate of transmission and distribution, which North Korea has placed at the top of its policy preference. Third, it is a utility scale renewable energy supply corresponding to the long-term renewable energy growth strategy of North Korea. This can be a necessary power supply for the economic cooperation zone, and it is desirable to secure the profitability of the project through emission reduction scheme. In the long run, it will be possible to seek connection with North Korea to overcome the network stability problem in the process of expanding renewable energy in South Korea.
3D MRI Imputation Using Learned Registration Fields
Jiyoon Shin(신지윤),Jungwoo Lee(이정우) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
An MRI 3D volume is represented by a number of imaging sequences such as T1-weighted, T2-weighted, and Flair; each sequence volume is visualized by a group of two-dimensional scans in a particular plane. In practical MRI, some scans are often missing while many medical applications require a full set of scans. An MRI imputation method is presented, which synthesizes such missing scans. Key components in this method are the index registration field $\Phi$ and the intensity registration field $\Psi$. The $\Phi$ models anatomical differences between two scans of different index in the same imaging sequence, and $\Psi$ reflects the image contrast difference between two scans of same index but in different imaging sequence. The two registration fields allow two estimates of a missing scan, one within corresponding imaging sequence and another along scan index; the two estimates are combined to yield the final synthesized scan. In experiments, the proposed imputation method is compared to VoxelMorph, pGAN-cGAN, and CollaGAN. It takes both anatomical- and contrast-changes into account through two registration fields, while other methods fail to reflect both. This is clear in visual comparison of synthesized images; the proposed method yields images with higher visual quality and richer details, especially in subtle parts located in the center of scan. Quantitative comparison through measures such as SSIM, NSME, and PSNR also demonstrate the superiority of the proposed imputation.
Capturing Korea’s Social Issues using KR-Word Bank Algorithm
Jiyoon Shin(신지윤),Jungwoo Lee(이정우) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
In this paper, we apply the Cheongwadae National Petition data to the KR-WordBank to extract keywords for social issues by category and era. The Cheong-WaDae National petition site allows anyone of all ages to register petitions, and it is safe to assume that it expresses people’s social interests and issues because mischief petitions are filtered through a series of processes. As the importance of NLP in deep learning emerged, WordBank, which can extract keywords after excluding unnecessary words from the text dataset, and KR-WordBank, which can be applied to Korean, were released. We used the KR-WordBank to propose our method.
2020년 코로나바이러스감염증-19 유행 상황에서 서울시 다중이용 시설 및 실외에서의 마스크 착용 행태
강소현(Sohyun Kang),곽수영(Sooyoung Guak),Altangerel Bataa,김동현(Donghyun Kim),정영덕(Youngdeok Jung),신지윤(Jiyoon Shin),이기영(Kiyoung Lee) 한국환경보건학회 2020 한국환경보건학회지 Vol.46 No.6
Objectives: After coronavirus disease 2019 (COVID-19) was declared a pandemic, the South Korean government announced guidelines on wearing masks to prevent its spread. The guidelines have changed depending on the severity of the spread of COVID-19. This study aimed to identify mask-wearing behaviours to counter the spread of COVID-19 in indoor and outdoor environments. Methods: The type of mask worn and proper wearing were observed in cafés, supermarkets, underground shopping malls, and streets in Seoul. Behavioral assessment was repeated in August at social distancing levels 1 and 2, in October at social distancing level 1, and in November after the mask mandates. Results: In August, 22.1% of subjects in cafés, 90.8% in supermarkets, 91.8% in underground shopping malls, and 83.6% on outdoor streets wore masks properly. In October, the proportion of correct wearers increased in all locations. After masks became mandatory in November, about 97% of users of supermarkets, underground shopping malls, and streets wore masks properly. In cafés, the proportion of proper wearers was 61.5% with both social distancing level 2 in August and the mandate in November. The number of KF-certified mask wearers continued to increase from August to November. Conclusion: This study investigated mask-wearing behaviors to counter COVID-19 through observations in indoor and outdoor places in Seoul. Mask-wearing behavior was different depending on the place and the government guidelines in place. The results could be used for evaluation of the current guidelines for COVID-19.