Photonic Crystal Effect of Nano-Patterned PEDOT

Jiyoung Han,Jiyoung Han,Dasom Park,Hyemin Kwon,Sanggyu Yim 한국진공학회 2012 한국진공학회 학술발표회초록집 Vol.2012 No.2

Prognostic factors of non-functioning pancreatic neuroendocrine tumor revisited

Jiyoung Bu,Sangmin Youn,Wooil Kwon,Kee Taek Jang,Sanghyup Han,Sunjong Han,Younghun You,Jin Seok Heo,Seong Ho Choi,Dong Wook Choi 한국간담췌외과학회 2018 Annals of hepato-biliary-pancreatic surgery Vol.22 No.1

Backgrounds/Aims: Various factors have been reported as prognostic factors of non-functional pancreatic neuroendocrine tumors (NF-pNETs). There remains some controversy as to the factors which might actually serve to successfully prognosticate future manifestation and diagnosis of NF-pNETs. As well, consensus regarding management strategy has never been achieved. The aim of this study is to further investigate potential prognostic factors using a large single-center cohort to help determine the management strategy of NF-pNETs. Methods: During the time period 1995 through 2013, 166 patients with NF-pNETs who underwent surgery in Samsung Medical Center were entered in a prospective database, and those factors thought to represent predictors of prognosis were tested in uni- and multivariate models. Results: The median follow-up time was 46.5 months; there was a maximum follow-up period of 217 months. The five-year overall survival and disease-free survival rates were 88.5% and 77.0%, respectively. The 2010 WHO classification was found to be the only prognostic factor which affects overall survival and disease-free survival in multivariate analysis. Also, pathologic tumor size and preoperative image tumor size correlated strongly with the WHO grades (p<0.001, and p<0.001). Conclusions: Our study demonstrates that 2010 WHO classification represents a valuable prognostic factor of NF-pNETs and tumor size on preoperative image correlated with WHO grade. In view of the foregoing, the preoperative image size is thought to represent a reasonable reference with regard to determination and development of treatment strategy of NF-pNETs.

Demand Analysis for the Development of Basic-Level TRIZ Curriculum

Han, Jiyoung,Yoo, Seung-Hyun Korean Society for Engineering Education 2014 공학교육연구 Vol.17 No.4

This study was conducted for the purpose of developing a basic-level TRIZ curriculum to improve students' creativity and problemsolving abilities. Towards this end, literature review, field application study, and a survey on the demand for such curriculum were conducted, as the research methodologies. Specifically, literature review was performed on the TRIZ-related research trends and education trends, and the researchers, who had experience running a TRIZ education program for a few years, ran a basic-level TRIZ for 40 hours as part of the extra-curriculum of A University. An actual survey was also conducted to determine the demand for the development of a basic-level TRIZ curriculum. Of the total of 40 students who were subjected to the curriculum, 31 responded sincerely 1 to the survey. Based on the survey analysis results on the students' recognition of the TRIZ curriculum and of the TRIZ task performance, and on the contents and educational effects of TRIZ, basic guidelines for the development of a basic-level TRIZ curriculum were formulated. Reflecting the results of the survey on the demand for a basic-level TRIZ curriculum, such a curriculum was proposed based on 16-week-long, 3-credit lectures considering the curricula of other subjects in the university.

Association between the prevalence of allergic reactions to skin prick tests and workplace types among agricultural workers in South Korea

Jiyoung Han,Yangwoo Kim,Sooyeon Lee,Soo-Jin Lee 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-

Background: Farmers are often exposed to dust, molds, pollen, animal products, insects, and chemicals. Accordingly, they have a high prevalence of respiratory and allergic diseases. Some studies have shown that farmers have a high prevalence of respiratory diseases and symptoms depending on where farmers work. The objective of the present study was to investigate whether certain types of agricultural workplaces are associated with the prevalence of allergic reactions in skin prick tests (SPTs) in South Korea. Method: A total of 149 farmers, grouped according to their workplaces in greenhouses, poultry houses, or outdoors, answered a self-reported questionnaire about the prevalence of respiratory diseases and symptoms. They were skin-tested using 12 allergens. The questionnaire and the prevalence of positive skin tests were determined for each of the participant groups, and the results were analyzed by multivariate logistic regression. Results: There were significant differences in the prevalence of allergic reactions to the SPT, chronic obstructive pulmonary diseases (COPDs) and asthma symptoms (wheezing) among the subgroups. The allergic reaction to SPT was the highest in greenhouse workers (30.9%), followed by poultry house workers (15.9%), and outdoor workers (8.1%). The prevalence of COPD was 6.8% in poultry house workers alone and not in other groups. The prevalence of wheezing was the highest at 9.1% in poultry house workers. According to the results of the logistic analysis, the prevalence of allergic reactions to SPT had positive correlations with the types of workplaces. Greenhouse workers had higher risk of SPT sensitization compared to outdoor workers (adjusted odds ratio [OR]: 5.55, 95% confidence interval [CI]: 1.32-32.24). The prevalence of SPT positivity also had an association with the symptoms of sneezing, rhinorrhea, or nasal congestion (adjusted OR: 6.64, 95% CI: 2.06-23.63). Conclusions: These data demonstrate that the types of workplaces were associated with the prevalence of allergic sensitization. This could be explained by the difference in the type or level of airborne exposures in each workplace. It is also likely that this was caused by differences between groups of individual factors such as age and BMI that influence SPT sensitization.

Distribution of integral lattice points in an ellipsoid with a diophantine center

Han, Jiyoung,Kang, Hyunsuk,Kim, Yong-Cheol,Lim, Seonhee Elsevier 2015 Journal of number theory Vol.157 No.-

<P><B>Abstract</B></P> <P>We evaluate the mean square limit of exponential sums related to a rational ellipsoid, extending a work of Marklof. Moreover, as a result of it, we study the asymptotic values of the normalized deviations of the number of lattice points inside a rational ellipsoid and inside a rational thin ellipsoidal shell.</P>

Risk Analysis of Radiographic Testing Companies using Radial Scale Analysis Model

JiYoung Han,Dayoung Gwon,Byeong-soo Kim,YongMin Kim 한국방사선학회 2018 한국방사선학회 논문지 Vol.12 No.6

방사선이 다양한 분야에 사용됨에 따라 방사선작업종사자의 수가 증가하고 있으며, 이에 따라 종사자의 안전에 대한 우려도 높아지고 있다. 국내에서는 KISOE 시스템, 발주자보고 등을 통해 종사자의 안전 확보에 주력하고 있다. 선행연구에서는 종사자 및 업체의 안전 확보를 위한 위험성 평가에 피폭선량과 더불어 이외의 항목에 대한 추가적 평가가 효과적일 것이라고 판단하여 평가를 위한 항목들 및 방사형 척도분석 모델을 개발하였다. 이에 본 연구에서는 2016년 방사선투과검사업체의 자료를 방사형척도분석 모델에 적용하여 실제 업체의 위험성 평가를 수행하였다. 또한 위험성이 낮을 것으로 예상되는 업체 2곳과 위험성이 높을 것으로 예상되는 업체 2곳을 선정하여 위험성 분석을 수행하였다. 분석 결과에서 예상과 동일한 결과를 얻어 모델의 타당성을 확인할 수 있었다. 전체 56개 업체의 위험성 평가가 수행되었고 업체별 문제점에 따른 개선 및 점검사항을 예측하였다. 본 연구 결과를 방사선투과검사업체 및 규제기관에서 자체 평가 및 규제 기준 등으로 활용할 수 있을 것으로 예상된다. As the radiation is used in various fields, the number of radiation workers is on the increase and there has been an increasa in interest in the radiation worker‘s safety. In South Korea, it is focusing on securing safety of workers through KISOE system and owner’s report. In advance study, We determined that in assessing the risks of securing safety for workers and businesses, the assessment of other items as well as exposure doses would be effective and develops the Radial Scale Analysis Model. So, data from the actual radiographic testing companies were applied to the radial scale analysis model to determine the risks of the actual companies. And, we selected 4 companies to confirm the applicability. Risk assessments of all 56 companies were conducted and improvements and inspections were anticipated for each company's problems. The results of the study are expected to be utilized by radiographic testing companies and regulatory for self-assessment and regulation criteria.

Validity Argument for Post-Entry Oral Performance Assessment for International Students in Korean Higher Education

Han Jiyoung,Lee Kilryoung 현대영어교육학회 2023 현대영어교육 Vol.24 No.-

With an increasing number of international students in Korean universities, communication breakdowns among international students, domestic students, and faculty members have been an important issue. However, their language ability and difficulties have received little attention. Since English is a lingua franca, this study evaluated their English oral communication ability by designing a post-entry oral performance assessment (PEOPA), conducting a pilot test, and investigating the validity of PEOPA based on Toulmin’s (2003) argument structure. Firstly, a survey was conducted with 15 international students studying at a Korean university to ask about their English use and identify the target language use (TLU) domain. Among them, 11 took pilot PEOPA. A many-Facet Rasch analysis indicated that PEOPA tasks stably assessed the oral communication ability of participants and reliably separated them into different ability levels. Raters consistently assessed performances according to a scoring rubric reflecting intended construction, with each scoring category measuring distinct aspects of oral communication ability. Along with Rasch analysis, qualitative analysis of participants’ transcribed performances provided further backing for test validity. Ensured validity of the assessment allowed us to propose the implementation of PEOPA in universities in similar contexts. Finally, the implications of findings for the diagnosis phase of PEOPA are discussed.

Demand Analysis for the Development of Basic-Level TRIZ Curriculum

Jiyoung Han,Seung-Hyun Yoo 한국공학교육학회 2014 공학교육연구 Vol.17 No.4

This study was conducted for the purpose of developing a basic-level TRIZ curriculum to improve students’ creativity and problem-solving abilities. Towards this end, literature review, field application study, and a survey on the demand for such curriculum were conducted, as the research methodologies. Specifically, literature review was performed on the TRIZ-related research trends and education trends, and the researchers, who had experience running a TRIZ education program for a few years, ran a basic-level TRIZ for 40 hours as part of the extra-curriculum of A University. An actual survey was also conducted to determine the demand for the development of a basic-level TRIZ curriculum. Of the total of 40 students who were subjected to the curriculum, 31 responded sincerely ŀto the survey. Based on the survey analysis results on the students’ recognition of the TRIZ curriculum and of the TRIZ task performance, and on the contents and educational effects of TRIZ, basic guidelines for the development of a basic-level TRIZ curriculum were formulated. Reflecting the results of the survey on the demand for a basic-level TRIZ curriculum, such a curriculum was proposed based on 16-week-long, 3-credit lectures considering the curricula of other subjects in the university.

공학설계교육을 통한 자기주도학습 능력 향상에 관한 연구

한지영(Jiyoung Han) 한국공학교육학회 2011 공학교육연구 Vol.14 No.1

This study had a purpose to examine that problem solving process through the product design and conceptual design in engineering design education affected the improvement of students self-directed learning ability. For this, we conducted in-depth interview with students that taken the introductory engineering design course. The main findings were as follows. First, the importance of diagnosing the learning needs and defining the problem was realized. Second, the importance of organizing lesson plans for problem solving and performing it out systematically was acknowledged. Third, they knew that continuous modification and supplements were needed, and also reviews and checks were needed after the evaluation process. Based on these results, the problem solving process of engineering design education affected a positive effect to students self-directed learning. 본 연구는 공학설계 교육을 통해 진행되는 개념설계와 제품설계의 문제해결과정이 학생들의 자기주도학습 능력 향상에 어떠한 영향을 미치는지 구명하는데 목적이 있다. 이를 위해 입문설계교육을 수강한 학생들을 대상으로 심층면담을 실시 하였는데, 이를 통해 도출된 주요 연구결과는 다음과 같다. 첫째, 문제해결과정을 통해 학습욕구를 진단하고 해결해야 할문제를 정의하는 것의 중요함을 깨닫게 되었다. 둘째, 문제정의 후 문제해결을 위한 학습계획을 구성하고 이를 체계적으로 수행해 나가는 것이 중요함을 인지하게 되었다. 셋째, 문제해결을 진행하는 과정에서 지속적인 수정 ․ 보완이 필요함을 알게 되었고, 과정 종료 후에도 평가 및 점검이 필요하다는 사실을 인지하게 되었다. 이러한 결과를 토대로 볼 때 설계 교육의 문제해결과정은 학생들이 자기주도적으로 학습하는데 긍정적인 영향을 미치고 있음을 알 수 있었다.

공과대학 여학생들을 위한 맞춤형 교육프로그램 개발을 위한 요구조사

한지영(Jiyoung Han),한승우(Seungwoo Han),김영석(Youngsuk Kim) 한국공학교육학회 2010 공학교육연구 Vol.13 No.4

본 연구는 공과대학 여학생들의 교육프로그램 개발을 위한 요구를 분석함으로써 향후 교육프로그램 운영을 위한 방향과 지침을 마련하고자 한다. 연구의 목적을 달성하기 위해 문헌연구와 조사연구를 수행하였는데, 공과대학의 교육환경 및 여학생들의 심리적 기제, 그리고 공과대학 여학생들을 위한 교육프로그램의 현황을 중심으로 문헌연구를 수행하였으며, 인천시 소재 I 대학교의 공과대학 학생 97명을 대상으로 조사연구를 수행하였다. 수집된 자료는 SPSS Window s 15.0 버전을 이용하여 기술 통계, 독립표본 t-검증, 대응표본 t-검증, ANOVA 검증, 교차분석 등의 분석 방법이 이용되었다. 연구결과 여학생들은 남학생 들에 비해 전반적으로 진보적인 성인지적 성향을 가지고 있으며, 특히 직장내 성역할에 대해 남학생들과 통계적으로 유의한 차이를 나타냈다. 공과대학 여학생들은 남학생들에 비해 특히 리더십이 부족하다고 인식하고 있었다. 또한 여학생들은 전공분야로 취업을 희망하는 정도가 남학생들에 비해 낮았고 전공분야 업무에 대한 자신감도 낮은 것으로 조사되었으며, 학교의 여학생 들을 위한 행정서비스에 대해 남학생들보다 높은 불만을 가지고 있는 것으로 나타났다. 향후 이와 같은 요구조사 결과를 토대로 공과대학 여학생들을 위한 체계적인 교육프로그램 개발 연구가 진행되어야 할 것이며 해당 프로그램의 적용에 따른 효과분석 연구가 수행되어야 할 것이다. Demands on customized educational programs for female students in college of engineering in university level make this study be launched and conducted. Literature reviews related to educational environments, psychological mechanism of female students and current status of conventional educational programs for them were provided. The related survey with 97 students in a university in Incheon was also conducted. Various statistical methods based on SPSS Window s 15.0 version were adopted and applied to analyze data which were collected through the survey. The result of data analysis addressed that female students appeared higher interests in gender recognition than male students do. This result was also proved by statistical analysis. Additional differential findings based on statistical analysis were gender roles and leaderships in classes, employment to the field of specialization and so on.