Development of a scintillation screen monitor and emittance measurement experiment at the National Cancer Center Korea

An Seohyeon,Lee Se Byeong,Kim Tae Jeong,Hahn Garam 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.84 No.1

This study presents a beam profle monitor composed of a vacuum chamber housing, a scintillator screen, a digital camera, and a custom control circuit based on Raspberry Pi for an accurate measurement of beam profles with a high spatial resolution which is crucial for beam quality assessment and control for the therapeutic beamline. A simple position calibration that uses perspective transform was conducted to map from the pixel space to real space. Additionally, we investigated fnding a proper noise fltering methods to mitigate stray and impulsive noises. We found that the non-local de-noising algorithm outperformed than median flter for reducing noise in a high-frequency region. As a demonstration of utilization of the profle monitor, we measured transverse beam emittances along the x and y axes using quadrupole scanning technique, which were resulted in 2.715±0.017 and 4.619±0.018 π mm mrad, respectively.

Deduction of Appropriate Measurement Time for Gamma Radionuclide Analysis Through the Minimum Detectable Activity of Unknown Sample

Sangbok Lee,Jeongsoo Park,Seokhwan Lee,Kwanggyun Choi,Jaemin Lee,Seohyeon Lee,Sanguk Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1

Appropriateness of the minimum detectable activity in the analysis of gamma radionuclides is very important. This is reason determine the time factor among the conditions of the analysis when it is rationally determined has the advantage that radioactivity analysis can be performed accurately and quickly. In this study, 100 mL of an unknown sample was diluted in Marinelli Beaker 1L to obtain, review data on gamma radiation analysis results and minimum detectable activity for each measurement time. The measurement was used High Purity Germanium detector, target nuclides are Co-57, Co-58, Y-88 and Cs-137. Since the radioactivity analysis sample will be expected to be the waste subject to selfdisposal or less during the radioactive waste classification, the minimum detectable activity standard was set based on the detection of less than the permissible activity for self-disposal for each nuclide. The measurement methods were measured by classifying it into seven categories: 1000 seconds, 3600 seconds, 10000 seconds, 30000 seconds, 80000 seconds, 100000 seconds, and 150000 seconds. The radioactivity from this measurement are Co-57 2.89 Bq·g?1, Co-58 0.19 Bq·g?1, Y-88 0.20 Bq·g?1, Cs-137 0.15 Bq·g?1, the measurement results under all conditions were similar. On the other hand, the minimum detectable activity showed values above the allowable activity for self-disposal in not but Co-58 at 1000 and 3600 seconds. Only after taking the measurement time of 10000 seconds, the result was derived Co-57 0.0095 Bq·g?1, Co-58 0.0068 Bq·g?1, Y-88 0.0052 Bq·g?1, Cs-137 0.0062 Bq·g?1, which was confirmed to less than the allowable activity for self-disposal by nuclide. Reasonably determining the measurement time in gamma radionuclide analysis is a very important issue in terms of economy of time and accuracy of measurement. Although this study cannot be said to be able to determine a reasonable measurement time for all gamma radionuclide analysis, it is hoped that research on various samples will be made to contribute to the efficient measurement of gamma radioactivity.

아버지의 언어통제 유형과 유아의 의사결정력의 관계

이서현 ( Lee Seohyeon ),이현정 ( Lee Hyeonjeong ),이정화 ( Lee Jung Hwa ),윤지영 ( Yoon Jiyoung ) 한국영유아교육보육학회 2021 영유아교육.보육연구 Vol.14 No.1

본 연구는 아버지의 언어통제유형과 유아의 의사결정력의 관계를 알아보는 것을 목적으로 아버지와 유아의 일반적 특성에 따라 아버지의 언어통제 유형과 유아의 의사결정력의 차이와 관계를 확인하는 데 있다. 연구대상은 K지역 C시에 소재한 국·공립 어린이집 한 곳과 직장어린이집 한곳, 사립유치원 한 곳의 만 3, 4, 5세 유아의 144명과 유아 아버지를 대상으로 선정하고, 유아의 담임교사인 26명에게 설문 조사를 실시하였다. 자료 수집은 SPSS 22.0 통계프로그램을 이용하여 t 검증과 ANOVA, Pearson 상관관계 분석을 통해 실시하였으며 연구 결과는 다음과 같다. 첫째, 아버지와 유아의 일반적 특성에 따라 아버지의 언어통제유형의 차이를 살펴 본 결과 아버지의 하루 평균 평일 양육 참여시간에 따른 유의미한 차이가 나타났다. 그러나 연령과 학력, 유아의 성별, 출생순위에 따른 유의미한 차이는 없었다. 둘째, 아버지와 유아의 일반적 특성에 따라 유아의 의사결정력 차이를 살펴본 결과 아버지의 일반적 배경에 따른 차이는 없었으나, 유아의 일반적 특성에서 유아의 성별, 연령에 따른 유의미한 차이를 보였다. 셋째, 아버지의 언어통제유형과 유아의 의사결정력 간의 상관관계 결과, 언어통제유형과 의사결정력의 하위요인인 참조적 의사소통능력과는 부적관계를 보였으나, 통계적으로 모두 유의미하지 않은 것으로 나타났다. This study examines how the father's type of verbal control influences children's decision-making ability and identifies the difference between the father's type of verbal control and the children's decision-making ability depending on the father's and children's general characteristics. Data collection was conducted using the SSPS 22.0 statistical program through t-validation, ANOVA, and Pearson correlation analysis. The results are as follows: First, according to the general characteristics of father and children, there were no significant differences in father's age, educational background, children's gender, and birth order, but there were significant differences in father's average weekday parenting time. Second, the difference in decision-making ability between father and children was statistically significant in father's age, educational level, father's average weekday parenting time, and weekend parenting time, but children's general characteristics show differences in gender and age. Third, the correlation between the father's verbal control type and the children's decision-making power results in no significant relationship between the type of language control and decision-making power.

Quercetin Mitigates Inflammatory Responses Induced by Vascular Endothelial Growth Factor in Mouse Retinal Photoreceptor Cells through Suppression of Nuclear Factor Kappa B

Lee, Minsup,Yun, Seohyeon,Lee, Hyesook,Yang, Jaewook MDPI 2017 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.18 No.12

<P>Retinal vascular endothelial growth factor (VEGF) increased by neovascularization is well known as a pathogenic factor in ocular neovascular diseases. However, it is still unclear how retinal neurons are damaged by VEGF. The aims of this study are to demonstrate the inflammatory protein expression regulated by VEGF using mouse photoreceptor-derived cells and the protective effect of quercetin against VEGF-induced inflammatory response. Expression and phosphorylation of protein and expression of mRNA were detected by immunoblot and reverse transcriptase polymerase chain reaction. VEGF-induced degradation of limiting membrane and translocation of nuclear factor kappa B (NF-κB) were analyzed by immunocytochemistry. VEGF treatment activated angiogenic signaling pathway in photoreceptor cells. In addition, adhesion molecules and matrix metalloproteinases were increased in VEGF-treated photoreceptor cells. All these events were reversed by quercetin. Zona occludins-1 and β-catenin decreased by VEGF were recovered by quercetin. NF-κB signaling pathway regulated by VEGF through phosphorylations of mitogen-activated protein kinases (MAPK) and protein kinase B (Akt) was suppressed by quercetin. These results suggest that quercetin suppressed VEGF-induced excessive inflammatory response in retinal photoreceptor cells by inactivation of NF-κB signals through inhibition of MAPKs and Akt. These data may provide a basic information for development of pharmaceuticals or nutraceuticals for treatment of retinal diseases caused by excessive VEGF.</P>

UX Scene의 가치 요소 도출을 위한 미래 자동차 UX 분석 모델 제안

권서현(Seohyeon Kwon),이종훈(Jonghoon Lee),김선욱(Sunwook Kim),이상원(Sangwon Lee) 한국혁신학회 2022 한국혁신학회지 Vol.17 No.4

Optimal Design of Shape of a Curved Tri-Wheel Mechanism for Various Sizes of Stairs

Yunhyuk Lee(이윤혁),Seohyeon Lee(이서현),Joohyun Oh(오주현),Hwa Soo Kim(김화수),TaeWon Seo(서태원) 제어로봇시스템학회 2019 제어·로봇·시스템학회 논문지 Vol.25 No.11

The key factor of Curved Tri-Wheel(CTW) robot that determines trajectory is shape of CTW, and we considered that it can be robustly optimized for various sizes of stairs. For this reason, in this study, optimization of the shape of CTW is conducted by using Taguchi method. To analyze the correlation between shape and trajectory, four shape elements of CTW is chosen for design variables. Four design variables and a size of stairs are divided into three levels respectively to apply orthogonal array in design of experiment. Simulations based on this orthogonal array are performed, and Signal-to-Noise Ratio(SNR) and sensitivity come out. By comparing SNR and an estimated maximum SNR(SNmax), and by analyzing sensitivity of four variables additional simulation is taken. As a result, optimized shape that enables CTW climb three different stairs more stably is obtained.

19C 무용에 나타난 여성의 몸 이미지 비교 연구 - 「춘앵전」과 「지젤」을 중심으로 -

이서현 ( Seohyeon Lee ) 한국무용예술학회 2014 무용예술학연구 Vol.48 No.3

The body is not a single material not implying any meaning in it but a changeful product of which meaning is produced within the society that is constantly changing. This study develops its discussion under the premise that women’s body images in dance works were expressed in the extended form of sexual discourse during the latter period of Joseon and Victorian Age having similarity of time as the 19C and also strict recognition on women’s body. First of all, this study analyzed women’s body images expressed in dance works comparatively by understanding the sexuality formed in the 19C, late Joseon and also Victorian Age, when they had historically strict, sexual recognition. And for the discussion, this study analyzed women’s body images in the two ages based on Foucault’s viewpoint that sexuality gets to be formed with the influence of society and culture. Examining the works of the two ages based on Foucault’s point of view, the paper has found that even though socially suppressed women’s body was expressed in common in the two ages, women’s body images did not appear in the same way. The works in late Joseon could not be freed from the images of women suppressed under the patriarchal ruling ideology but expressed sexual images moderately. On the other hand, the works in Victorian Age expressed sexual images deviated boldly from the body recognition that was strictly controlled in the society. Therefore, women’s images expressed in the artistic works of the two ages were either produced in the way to restrain sexuality formed in society or deviated boldly from it, and they implied the socio-cultural perspective in them. Therefore, this study is significant in that it discovers the fact that women’s body images in the dance works contain socio-culturally constructed sexuality. This allows us to recognize again the importance of social roles of dance which takes the body as its medium more than any other type of art.

독자투고란 변화 연구 : 제주지역 일간지를 중심으로

이서현 ( Lee Seohyeon ) 한국지역언론학회 2021 언론과학연구 Vol.21 No.4

본 연구에서는 2000년대 이후 제주지역 일간지 독자투고란의 투고자와 투고내용에 어떤 변화가 있었는지 살펴보고자 하였다. 이를 위해 <한라일보>와 <제민일보>에 2000년, 2010년, 2020년 3년간 게재된 독자투고란을 분석대상으로 삼았으며, 1년 12일치를 선택하여 구성주 표집했다. 분석결과, 투고자의 성별은 과거에는 남성이 90%에 달했던 반면, 가장 최근인 2020년에는 남녀 모두 50%로 동일했다. 투고자의 직업은 과거에는 일반인을 비롯하여 공직자, 전문가 등 비교적 다양했으나, 최근으로 올수록 공직자의 비율이 증가하여 2020년에는 그 비율이 90%를 상회한 것으로 나타났다. 독자투고의 주제는 사회·복지·안전, 행정, 환경·건강 관련 주제가 많았다. 언론보도에 대한 피드백 형식의 독자투고는 최근으로 올수록 점차 감소하여 2010년과 2020년에는 각각 1건에 그쳤다. 투고대상은 과거에는 행정당국, 언론사 등 다양했으나 최근으로 올수록 도민을 대상으로 한 독자투고가 83%에 달했다. 서술형식은 2000년에 건의·제안, 비판, 항변 등 다양했지만, 2020년에 들어서는 홍보의 비율이 53%에 달했던 것으로 나타났다. 이처럼 독자투고란은 일반 독자들의 다양한 의견을 개진하고 공유하는 ‘여론 형성의 장’의 역할을 수행해야 함에도 공직자들의 승진을 위한 ‘실적 경쟁의 장’이 되면서 본래의 취지를 벗어나고 있었다. This study analyzed changes of the letters-to-the-editor in the Jeju daily newspaper since the 2000s. For this purpose, Halla Ilbo and Jemin Ilbo were chosen, and 3 years in 2000, 2010, and 2020 were selected and analyzed 12 days per year. In the past, male writers were 90%, but in 2020, both males and females showed the same ratio at 50%. The writers’ occupation was relatively diverse in the past including the general public, public officials, and experts. The topics of letters-to-the-editor were mostly about society- welfare-safety, administration, and environment-health. The letters-to- the-editor as feedback on news reports have gradually decreased in recent years. In the past, the target audience for letters-to-the-editor was diverse, including administrative authorities and media, but in recent years, 83% of letters-to-the-editor were toward residents. The format varied in 2000, including suggestions, criticisms, and protests, but in 2020, the proportion of letters-to-the-editor for PR reached 53%. In this way, although the letters-to-the-editor should play a role in forming the public opinion by expressing and sharing various ideas of the general public, it became a ‘place of performance competition’ for public officials’ promotion, not doing the original role of letters-to-the-editor.

오버투어리즘(overtourism) 전조 현상과 경계

이서현(Seohyeon Lee) 한국언론정보학회 2018 한국언론정보학보 Vol.88 No.-

본 연구에서는 최근 글로벌 이슈로 부상한 ‘오버투어리즘’과 관련하여 국내외 언론이 이를 어떻게 규정하고 있는지 파악하고, 주요 현상을 근거로 제주지역의 투어리즘 실태를 진단해 보았다. 국내외 언론은 오버투어리즘을 ‘지나치게 많은 관광객으로 인해 삶의 질, 생태 또는 장소의 경험이 용납할 수 없을 정도로 악화되었다고 느끼는 상황’으로 규정하고 있었다. 오버투어리즘의 주요 특성으로는 초과 관광객의 유입, 이로 인한 현지주민들의 생활권 침해, 투어리스티피케이션, 투어리스트 포비아, 맥도날드 투어리즘 등을 짚었으며, 여기에 관광객의 유입을 반대하고 저지하려는 현지인들의 대규모 시위가 동반되고 있다고 밝혔다. 한편, 제주지역에서는 오버투어리즘 현상이 나타나고 있다고 단정하기에는 다소 이른감이 있다. 다만, 장기적인 관점에서 오버투어리즘으로 이어질 소지가 다분한 상황들, 즉 오버투어리즘 전조 현상들이 목격되고 있었다. 결과적으로 오버투어리즘을 경계하고 이를 예방하기 위해 제주 지역언론은 관광객 및 관광수입 규모만 강조하는 수치 중심의 보도를 지양하고, 지역주민의 관점에서 관광문제를 다뤄야 할 것이다. 또한 특정 관광객이나 국가에 대한 편견과 혐오를 양산할 수 있는 보도를 지양하고, 관광문제를 다각도로 다룰 수 있는 전문기자를 양성해야 할 것이다. This study explores how domestic and foreign media present the global issue of “Overtourism” that has emerged in recent years. I examined the phenomenon of overtourism in Jeju, South Korea. Domestic and foreign media outlets have defined overtourism as “a side effect caused by the inflow of tourists that exceed the capacity of tourist attractions.” There are four main characteristics of overtourism: infringement of residents’ living rights, touristification, tourist-phobia, and the McDonaldization of tourism. In Jeju it is too early to evaluate overtourism; however pre-overtourism phenomena, such as the prevailing distribution of tourism revenue, touristification, Chinese-phobia, and U-do situations, already exist. These situations are likely to lead to overtourism. To prevent overtourism, the local media in Jeju should avoid emphasizing the volume of tourists and income from tourism. Instead, they should deal with tourism issues from the residents’ perspective. Additionally, the media should refrain from reporting the prejudice and hatred against tourists from specific countries and instead cultivate journalists who can report on tourism issues in various ways.

4G 네트워크에서의 그룹 기반 인증

정서현(Seohyeon Jeong),김경선(Kyeongseon Kim),김용훈(Yonghun Kim),이준욱(Junwook Lee),이윤성(Yunseong Lee),엄재현(Jaehyeon Eom),장용운(Yongwoon Jang),나웅수(Woongsoo Na),김중헌( Joongheon Kim),조성래(Sungrae Cho) 한국통신학회 2017 한국통신학회 학술대회논문집 Vol.2017 No.1