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윤정원,방정환,고용호,유세훈,김준기,이창우,Yoon, Jeong-Won,Bang, Jung-Hwan,Ko, Yong-Ho,Yoo, Se-Hoon,Kim, Jun-Ki,Lee, Chang-Woo 한국마이크로전자및패키징학회 2014 마이크로전자 및 패키징학회지 Vol.21 No.4
The paper gives an overview of the concepts, basic requirements, and trends regarding packaging technologies of power modules in hybrid (HEV) and electric vehicles (EV). Power electronics is gaining more and more importance in the automotive sector due to the slow but steady progress of introducing partially or even fully electric powered vehicles. The demands for power electronic devices and systems are manifold, and concerns besides aspects such as energy efficiency, cooling and costs especially robustness and lifetime issues. Higher operation temperatures and the current density increase of new IGBT (Insulated Gate Bipolar Transistor) generations make it more and more complicated to meet the quality requirements for power electronic modules. Especially the increasing heat dissipation inside the silicon (Si) leads to maximum operation temperatures of nearly $200^{\circ}C$. As a result new packaging technologies are needed to face the demands of power modules in the future. Wide-band gap (WBG) semiconductors such as silicon carbide (SiC) or gallium nitride (GaN) have the potential to considerably enhance the energy efficiency and to reduce the weight of power electronic systems in EVs due to their improved electrical and thermal properties in comparison to Si based solutions. In this paper, we will introduce various package materials, advanced packaging technologies, heat dissipation and thermal management of advanced power modules with extended reliability for EV applications. In addition, SiC and GaN based WBG power modules will be introduced.
B16/F10 흑색종양세포에서 삼내자 메탄올 추출물의 멜라닌 생성에 미치는 억제효과
윤정원,한정민,윤화정,고우신,Yoon, Jung-Won,Han, Jung-Min,Yoon, Hwa-Jung,Ko, Woo-Shin 대한한방안이비인후피부과학회 2013 한방안이비인후피부과학회지 Vol.26 No.1
Objective: Recently the demands for the effective and safe depigmentative and anti-aging agents of the skin have increased due to the medical, pharmaceutical and cosmetic reasons. The purpose of this study is to investigate the MKG(Methanol Extract of Kaempferia galanga) and their dermal bioactivity properties related to cosmeceuticals such as depigmentation. Methods: We assessed inhibitory effects of MKG on melanin production in B16/F10 melanoma cells, on mushroom tyrosinase activity, effects of MKG on the expression tyrosinase, TRP-1, TRP-2, GSK-$3{\beta}$, CREB, MITF in B16/F10 melanoma cells without cytotoxicity range. Cell viability was measured by MTT assay and tyrosinase activity was assessed using by DOPA staining, western-blot analysis. We measured inhibition of melanin synthesis and tyrosinase activity by down-regulation of melanogenic enzyme expressions in ${\alpha}$-MSH induced melanogenesis B16/F10 melanoma cells. Results: MKG inhibited tyrosinase-activity, total melanin contents and dendrite out-growth. MKG inhibited melanogenesis by down-regulation of tyorsinase, TRP-1, TRP-2, CREB, and MITF in B16/F10 cells. The treatment with MKG at the 12.5, $25{\mu}g/ml$ level significantly inhibited the melanin synthesis induced ${\alpha}$-MSH in B16/F10 melanoma cells compared with untreated control. Conclusion: These results suggest that MKG inhibit melanin biosynthesis which is involved in hyper-pigmentation. So MKG is considered to be used as a whitening components reducing cytotoxicity.
페이스북 건강정보 게시물 형식이 시각적 주의와 인지결과에 미치는 영향
윤정원,신수연,Yoon, JungWon,Syn, Sue Yeon 한국문헌정보학회 2021 한국문헌정보학회지 Vol.55 No.3
소셜미디어 상에서 보다 효과적인 건강정보 전달을 위해 시각정보가 많이 사용되고 있다. 그러나 시각정보가 사용된 소셜미디어상의 건강정보를 이용자들이 어떻게 읽고, 시각정보가 어느 정도 효과적인 정보전달을 하는가에 대한 연구는 미흡한 상황이다. 이에 본 연구는 페이스북 상의 건강정보를 담은 게시물을 사용하여 이용자들의 게시물 시선주시 패턴과 회상 및 인지테스트 결과를 보고하였다. 21명의 대학생들을 대상으로 하여, 온라인 설문지, 시선추적실험, 회상과 인식 테스트를 수행하였다. 그 결과, 첫째, 이용자들은 정보를 포함하고 있는 영역에 주의를 집중하는 것으로 밝혀졌다. 정보를 포함하지 않고 있는 사진보다는 본문의 내용에 이용자들은 먼저 시선집중하는 것으로 나타났다. 둘째, 인포그래픽을 포함한 게시물의 경우 이용자들이 인포그래픽에 주의를 집중하지만, 회상과 인식 테스트 결과는 사진을 포함한 게시물보다 낮게 나타났다. 특히 콜라주 형식의 복잡한 인포그래픽을 포함한 게시물의 회상과 인식 테스트 결과가 낮은 것으로 나타났다. 셋째, 본문 길이를 살펴보면, 본문의 길이가 짧은 게시물의 회상과 인식테스트 결과가 높은 것으로 나타났다. 본 연구의 의의는 페이스북 건강정보 제공자 및 배포자에게 페이스북 게시물 디자인 시 고려사항에 대해 제안점을 제시한 점을 들 수 있다. Visual information is widely used to deliver health information more effectively on social media, but there is lack of research on how effectively visual information delivers health information on social media. This study reports Facebook users' reading patterns and cognitive tests (recall and recognition tests) results using health-related Facebook posts. For this study, 21 college students participated in online questionnaire, eye tracking experiment, and recall and recognition tests. First, users paid their attention to the area that contains information (i.e., users focused on the main text rather than photos that do not contain information). Second, in the case of Facebook posts containing infographics, users paid their attention on the infographics, but the recall and recognition test results of the posts with infographics were lower than the posts containing photos. Particularly, when the infographics are in a complex collage format, recall and recognition tests result lower scores. Third, regarding the length of the text, the Facebook posts with short text resulted in higher recall and recognition test scores than the posts with medium or long texts. This study suggested to Facebook health information providers and distributors how to design Facebook posts for delivering health information more effectively.