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김해영 ( Haeyoung Kim ),정정주 ( Chung Joo Chung ) 한국지역언론학회 2020 언론과학연구 Vol.20 No.2
본 연구는 가짜뉴스 규제 입안에 있어 고려해야 할 쟁점을 도출하고, 관련 정책대안을 탐색하고자 하였다. 최근 가짜뉴스로 인한 피해가 급증함에 따라, 정부나 규제기관의 시장 개입이 불가피해졌다. 반면, 표현의 자유를 침해할 수 있는 직접 규제를 최소화해야 한다는 반론도 제기된다. 본 연구에서는 가짜뉴스에 대한 기존 논의들을 검토해 정책 도입을 위한 주요 쟁점으로 가짜뉴스의 개념, 판정 준거. 규제범위, 규제 실효성 이슈를 제시하였다. 이러한 쟁점들은 위계적인 구조를 가지며 상호연결되는 것으로 판단된다. 즉, 가짜뉴스의 개념을 통해 판정 준거를 마련하고, 규제범위를 획정하는 한편, 구체적인 정책 대안을 도출할 수 있다는 것이다. 본 연구는 가짜뉴스와 관련된 이론적 논의에 기초해 주요 쟁점을 재구성하고, 정책 입안의 방향성과 고려 사항을 구체화하였다. 나아가 사후적인 처벌 규제와 자율규제, 팩트체킹 사업자의 지원, 미디어 교육 등 진흥 정책의 효과를 논의하였다. 이를 통해 가짜뉴스 규제 입안의 근거를 마련하고, 정책 및 규제와 관련한 사회적 소통을 촉구한다. Fake news has become a global phenomenon due to its explosive growth. In spite of an increase in the infringement of societal legal rights caused by fake news, it is not easy to seek reasonable methods to legally regulate fake news. This is because the specification of victim and clear identification of infringed legal interest are difficult. In order to restrain the spread of fake news, the measures for legally regulating fake news to the minimum necessary need to be explored and the legal regulation of fake news should focus on the prevention of imminent and irreparable social harms that can be caused by fake news. This research presents a comprehensive overview of the regulation and policy issues relating to fake news. The goal of this research is to (1) introduce the concept and characteristics of fake news and how it can be formally differentiated from other similar concepts which helps deepen the understanding of fake news; (2) provide a comprehensive review of fundamental frame of fake news detection technology; (3) demarcate the legal scope of fake news regulation; and (4) to analyze the costs and benefits of fake news regulation in Korea.
Chung Kwangzoo,Kim Nalee,Cho Won Kyung,Kim Haeyoung,Oh Dongryul,Park Won,Park Hee Chul,Lim Do Hoon 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.84 No.5
To enhance the efciency of treatment planning and beam delivery in line-scanning proton beam therapy, we conducted a comparative analysis of various strategies for arranging the Bragg peak within the optimization of treatment plans. In RayStation, we had the fexibility to manipulate optimization parameters, specifcally energy layer and line spacing, to control the Bragg peak’s location. To assess the impact of these parameters, we created a virtual spherical target and generated treatment plans employing both single and dual beams with diverse arrangement strategies. We then evaluated the target volume coverage using the homogeneity index. Furthermore, we selected 15 line-scanning plans. For each line-scanning plan, we generated nine comparative plans, employing distinct Bragg peak arrangement strategies. These strategies involved variations in energy layer and line spacing settings. We optimized these plans and compared their quality to the default setting. In addition, treatment planning and beam delivery efciency were estimated. Our analysis indicated that smaller energy layer and line spacing generally resulted in improved homogeneity indices. Notably, reducing line spacing proved to be more efcient than decreasing energy layer spacing, a trend that remained consistent in the line-scanning plans. For linescanning plans, adjustments in line spacing produced more efcient improvements in the conformity index and D1cc. Based on our fndings, adjusting line spacing is a more efective strategy for optimizing Bragg peak placement in RayStation. This adjustment not only enhances treatment planning but also improves beam delivery efciency by reducing the time required for energy layer switching.
Kim, Yun Hee,Chung, Jee-In,Woo, Hyun Goo,Jung, Yi-Sook,Lee, Soo Hwan,Moon, Chang-Hyun,Suh-Kim, Haeyoung,Baik, Eun Joo Wiley (John WileySons) 2010 Stem Cells Vol.28 No.10
<P>Neuronal precursor cells (NPCs) are temporally regulated and have the ability to proliferate and differentiate into mature neurons, oligodendrocytes, and astrocytes in the presence of growth factors (GFs). In the present study, the role of the Jak pathway in brain development was investigated in NPCs derived from neurosphere cultures using Jak2 and Jak3 small interfering RNAs and specific inhibitors. Jak2 inhibition profoundly decreased NPC proliferation, preventing further differentiation into neurons and glial cells. However, Jak3 inhibition induced neuronal differentiation accompanied by neurite growth. This phenomenon was due to the Jak3 inhibition-mediated induction of neurogenin (Ngn)2 and NeuroD in NPCs. Jak3 inhibition induced NPCs to differentiate into scattered neurons and increased the expression of Tuj1, microtubule associated protein 2 (MAP2), Olig2, and neuroglial protein (NG)2, but decreased glial fibrillary acidic protein (GFAP) expression, with predominant neurogenesis/polydendrogenesis compared with astrogliogenesis. Therefore, Jak2 may be important for NPC proliferation and maintenance, whereas knocking-down of Jak3 signaling is essential for NPC differentiation into neurons and oligodendrocytes but does not lead to astrocyte differentiation. These results suggest that NPC proliferation and differentiation are differentially regulated by the Jak pathway.</P>
Samuel Takele Kenea,Haeyoung Lee,Sangwon Joo,Shanlan Li,Lev D. Labzovskii,Chu-Yong Chung,Yeon-Hee Kim 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
Understanding the temporal variability of atmospheric methane (CH₄) and its potential drivers can advance the progress toward mitigating changes to the climate. To comprehend interannual variability and its drivers, we used integrated data from different platforms such as in situ measurements, TROPOMI, and GOSAT retrievals. A pronounced change of annual growth rate was detected at Anmyeondo (AMY), Republic of Korea, ranging from -16.8 to 31.3 ppb yr<SUP>-1</SUP> as captured in situ through 2015-2020 and 3.9 to 16.4 ppb yr<SUP>-1</SUP> detected by GOSAT through 2014-2019, respectively. High growth rates were discerned in 2016 (31.3 ppb yr<SUP>-1</SUP> and 13.4 ppb yr<SUP>-1</SUP> from in situ and GOSAT, respectively) and 2019 (27.4 ppb yr<SUP>-1</SUP> and 16.4 ppb yr<SUP>-1</SUP> from in situ and GOSAT, respectively). The high growth in 2016 was essentially explained by the strong El Niño event in 2015-2016, whereas the large growth rate in 2019 was not related to ENSO. We suggest that the growth rate that appeared in 2019 was related to soil temperature according model. The stable isotopic composition of <SUP>13</SUP>C/<SUP>12</SUP>C in CH₄ (δ<SUP>13</SUP>-CH₄) collected by flask-air sampling at AMY during 2014-2019 supported the soil methane hypothesis. The intercept of the Keeling plot for summer and autumn were found to be -53.3‰ and -52.9‰, respectively, which suggested isotopic signature of biogenic emissions. The isotopic values in 2019 exhibited the strongest depletion compared to other periods, which suggests even a stronger biogenic signal. Such changes in the biogenic signal were affected by the variations of soil temperature and soil moisture. The pixel-wise correlation of XCH₄ anomaly with those parameters indicated in the range of 0.5-0.8 with a statistical significance (p<0.05). This implies that the soil-associated drivers are able to exert a large-scale influence on the regional distribution of CH₄ in Korea.
Samuel Takele Kenea,Haeyoung Lee,Sangwon Joo,Shanlan Li,Lev D. Labzovskii,Chu-Yong Chung,Yeon-Hee Kim 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
To comprehend interannual variability of CH₄ and its drivers, we used integrated data from different platforms such as in situ measurements, TROPOMI, and GOSAT retrievals. A pronounced change of annual growth rate was detected at Anmyeondo (AMY), Korea, ranging from -16.8 to 31.3 ppb yr<SUP>−1</SUP> as captured in situ through 2015-2020. High growth rates were discerned in 2016 (31.3 ppb yr<SUP>−1</SUP> and 13.4 ppb yr<SUP>−1</SUP> from in situ and GOSAT, respectively) and 2019 (27.4 ppb yr<SUP>−1</SUP> and 16.4 ppb yr<SUP>−1</SUP> from in situ and GOSAT, respectively). The high growth in 2016 was essentially explained by the strong El Niño event in 2015–2016, whereas the large growth rate in 2019 was not related to ENSO. We suggest that the growth rate that appeared in 2019 was related to soil temperature. The stable isotopic composition of <SUP>13</SUP>C/<SUP>12</SUP>C in CH₄ (δ<SUP>13</SUP>-CH₄) collected by flask-air sampling at AMY during 2014-2019 supported the soil methane hypothesis. The isotopic values in 2019 exhibited the strongest depletion compared to other periods, which suggests even a stronger biogenic signal that was affected by the variations of soil temperature and soil moisture.