Demand for Solar Home Systems in Cambodia: Public Awareness and Willingness to Pay from Takeo Province

강윤진(Yoonjin Kang),김동훈(Donghun Kim),윤세미(Semee Yoon) 국제개발협력학회 2020 국제개발협력연구 Vol.12 No.1

연구목적: 기후변화 대응전략으로 여겨지는 태양광 시장 구축은 국제개발협력분야에서도 중요한 이슈로 이뤄지고 있는데, 캄보디아 태양광 시장에 대한 연구는 아직 미미한 편이다. 따라서 본 연구는 캄보디아 농촌 지역의 태양광 수요조사를 알아보고자 한다. 연구의 중요성: 세계은행에 의하면 캄보디아는 지난 20년 동안 꾸준한 경제 성장과 도시화로 인해 전기 수요 또한 증가하고 있다. 그러나 캄보디아는 현재 전력부족 문제를 겪고 있을 뿐만 아니라 에너지 수입에 대한 의존도가 높아 세계적으로 전력 요금이 비싼 편이다. 이로 인해 캄보디아 정부는 태양광 에너지를 통한 전력도입에 주의를 기울이고 있다. 연구방법론: 태양광 시장 전망을 확인하기 위해 캄보디아의 농촌 지역인 따께오 주에서 설문조사를 시행하고 결과를 회귀분석을 사용해 분석했다. 연구결과: 응답자들은 가정용태양광시스템(SHS)에 대한 관심은 많으나 활용성에 대한 의문점을 갖고 있으며, 가구소득, 기후변화에 대한 인식 및 전력 사용 경험에 따라서 SHS에 대한 지불의사액이 높은 것으로 나타났다. 결론 및 시사점: 이와 같은 결과는 태양광 제품 지불의사액이 가구소득, 전력 사용 경험 및 기후변화에 대한 인식에 의해 변할 수 있다는 증거를 제공한다. 또한 태양광 제품 지불의사액이 시장거래액과 비슷하다는 점은 캄보디아 농촌지역에서 태양광 사업가들이 활동할 만한 시장성이 있음을 시사한다. 캄보디아 정책입안자들이 재생에너지 활용에 갖는 높은 관심을 고려했을 때 추후 태양광 제품 구입 확산 및 활용 캠페인에 전력 활용도 및 기후변화 전략 교육도 함께 제공하는 방안도 모색해볼 수 있을 것이다. Purpose: The introduction of the solar energy market is considered to be an effective climate action strategy in the international development cooperation field, and yet, the research on the solar market in Cambodia is currently limited. Consequently, this research seeks to understand the demand for solar market in rural Cambodia. Originality: According to the World Bank, Cambodia has witnessed an enormous rise in electricity demand due to its steady economic growth and urbanization over the last two decades. However, Cambodia suffers significantly from persisting energy shortages while its electricity cost remains one of the highest in the world as a result of heavy dependence on imported electricity. Meanwhile, solar energy has been recognized as a potential domestic energy source by the government. Methodology: Thus, to check for the solar market potential, we surveyed households in rural Takeo, Cambodia, to better understand the demand for solar home systems (SHS). Result: We find that there is a high interest in SHS, but respondents show doubt about its benefits and functionality. We also find that household income and prior exposure to climate change and electricity influence willingness to pay for SHS. Conclusions and Implication: These findings provide evidence on key household characteristics that are associated with the willingness to pay for SHS, e.g. household income, prior exposure to electricity and climate change. Along with these key characteristics, the average WTP for SHS is similar to the market price, indicating the rural poor’s valuation of solar energy options has market potential for solar energy entrepreneurs. Since policymakers of Cambodia have shown emphasis on renewable energy adoption, public advocacy campaigns based on the benefits of SHS regards to access to electricity and climate action strategy may be needed to promote adoption.

Association among Sleep duration, Sleep quality, and Obesity in Korean

Bori Kang,Miae Doo,Yoonjin Shin,Eunyoung Lee,Hyunmi Ko,Yangha Kim 한국식품영양과학회 2016 한국식품영양과학회 학술대회발표집 Vol.2016 No.10

The study of collision effect in quadrupole and octopole rods

Sungwon Kang,Ju Woo,Yoonjin Jeong,Hun Lee,Nam-Seok Lee 한국분석과학회 2020 학술대회논문집 Vol.2020 No.11

The study of ion Trajectories in various multipole rods

Sungwon Kang,Ju Woo,Yoonjin Jeong,Hun Lee,Nam-Seok Lee 한국분석과학회 2020 학술대회논문집 Vol.2020 No.11

여대생의 DISC 행동유형과 식사태도

배은정,강윤진,김미래,김민성,김석천,신혜원,정효영,권민 水原大學校 2018 論文集 Vol.32 No.-

The purpose of this study was to define DISC Behavioral Types and Eating Attitude(KEAT-26) of Female University Students. Data were collected using a questionnaires targeting Female University Students. Data collection was done between July 9, 2015 and October 17, 2015, and colleted total 297 copies. Data analyzed using t-test , ANOVA Scheffe test and Pearson's correlation coefficients. The main results of this study are BMI(p=.001), frequency of meal(p=.031), smoking(p=.023) were a signifieant difference related to Eating Attitude(KEAT-26).

Ligand-Independent Epidermal Growth Factor Receptor Overexpression Correlates with Poor Prognosis in Colorectal Cancer

Yun, Sumi,Kwak, Yoonjin,Nam, Soo Kyung,Seo, An Na,Oh, Heung-Kwon,Kim, Duck-Woo,Kang, Sung-Bum,Lee, Hye Seung Korean Cancer Association 2018 Cancer Research and Treatment Vol.50 No.4

<P><B>Purpose</B></P><P>Molecular treatments targeting epidermal growth factor receptors (EGFRs) are important strategies for advanced colorectal cancer (CRC). However, clinicopathologic implications of EGFRs and EGFR ligand signaling have not been fully evaluated. We evaluated the expression of EGFR ligands and correlation with their receptors, clinicopathologic factors, and patients’ survival with CRC.</P><P><B>Materials and Methods</B></P><P>The expression of EGFR ligands, including heparin binding epidermal growth factor-like growth factor (HBEGF), transforming growth factor (TGF), betacellulin, and epidermal growth factor (EGF), were evaluated in 331 consecutive CRC samples using mRNA <I>in situ</I> hybridization (ISH). We also evaluated the expression status of EGFR, human epidermal growth factor receptor 2 (HER2), HER3, and HER4 using immunohistochemistry and/or silver ISH.</P><P><B>Results</B></P><P>Unlike low incidences of <I>TGF</I> (38.1%), <I>betacellulin</I> (7.9%), and <I>EGF</I> (2.1%), <I>HBEGF</I> expression was noted in 62.2% of CRC samples. However, the expression of each EGFR ligand did not reveal significant correlations with survival. The combined analyses of EGFR ligands and EGFR expression indicated that the ligands‒/EGFR+ group showed a significant association with the worst disease-free survival (DFS; p=0.018) and overall survival (OS; p=0.005). It was also an independent, unfavorable prognostic factor for DFS (p=0.026) and OS (p=0.007). Additionally, HER4 nuclear expression, regardless of ligand expression, was an independent, favorable prognostic factor for DFS (p=0.034) and OS (p=0.049), by multivariate analysis.</P><P><B>Conclusion</B></P><P>Ligand-independent EGFR overexpression was suggested to have a significant prognostic impact; thus, the expression status of EGFR ligands, in addition to EGFR, might be necessary for predicting patients' outcome in CRC. </P>

한국 농촌 여성의 스트레스 정도에 따른 항산화 영양소 섭취와 대사증후군 위험도

윤정원(Jungwon Yoon),신윤진(Yoonjin Shin),강보리(Bori Kang),변수지(Suji Byeon),김수아(Soo A Kim),김양하(Yangha Kim) 한국식품영양과학회 2017 한국식품영양과학회지 Vol.46 No.7

본 연구는 스트레스 정도에 따른 영양소 섭취와 대사증후군 위험도를 분석하고자 수행되었다. 본 연구는 40~69세 일반인구 집단을 대상으로 실시한 한국인 역학조사 사업 중 농촌기반코호트를 이용하여 진행하였고, 그중 여성을 대상으로 분석하였다. 대상자들은 사회 심리적 건강측정도구(Psy chosocial Well-being Index, PWI)를 기초로 하여 개발된 18문항의 단축형(PWI-SF)의 평균값을 기준으로 0~26점의 저스트레스군과 27점 이상인 고스트레스군으로 분류되었다. 영양 섭취 상태 및 식습관은 반정량식품섭취빈도조사방법(semi-quantitative food frequency questionnaire, SQFFQ)을 이용하여 평가하였다. 고스트레스군 대상자들은 저스트레스군보다 나이, 허리둘레, 혈압이 유의적으로 낮았으며 신장은 유의적으로 높았다. 혈액분석 결과에서는 고스트레스군이 저스트레스군보다 공복혈당, 인슐린 저항성 지수, 중성지방, 동맥경화 지수가 유의적으로 높았다. 영양소섭취를 분석한 결과 고스트레스군 대상자들이 저스트레스군보다 항산화 영양소인 비타민 A, 비타민 C, 비타민 E, 엽산, 아연, 카로틴을 더 적게 섭취하였다. 과일과 채소의 섭취량 또한 고스트레스군이 저스트레스군보다 유의적으로 적었다. 스트레스와 대사증후군 위험의 관계를 살펴본 결과 고스트레스군 대상자들이 저스트레스군보다 대사증후군의 교차비가 유의적으로 높았다. 결과적으로 한국 농촌 여성에서 스트레스가 높을수록 항산화 영양소와 과일 및 채소의 섭취가 적었으며 대사증후군 위험이 증가하는 것으로 나타났다. The aim of the present study was to investigate antioxidant nutrient intake and risk of metabolic syndrome based on stress level in rural Korean women. Subject were participants from the Multi-Rural Communities Cohort Study, which was a part of the Korean Genome and Epidemiology Study. According to scores of the Psychosocial Well-Being Index Short-Form, a total of 10,111 subjects were classified into ‘low stress group (n=8,015)’ from 0 to 26 points and ‘high stress group (n=2,096)’ above 27 points. Data were collected using self-administered questionnaires, anthropometric measurements, and blood chemical analysis. Dietary nutrient consumption was assessed by a semi-quantitative food frequency questionnaire. High stress group showed lower intake of antioxidant nutrients, such as vitamin A, vitamin C, vitamin E, folate, zinc, and carotene compared to the low stress group. Intake of fruits and vegetable was lower in the high stress group compared to the low stress group. Subjects with high stress showed higher risk of hypertension [odd ratio (OR), 95% confidence interval (CI)=1.226 (1.112∼1.351)] and hypertriglyceridemia [OR, 95% CI=1.227 (1.110∼1.356)] than subjects with low stress. High stress group had a significantly greater odds ratio for metabolic syndrome compared with the low stress group [OR, 95% CI=1.216 (1.101∼1.342]). Thus, the present study suggests that high stress might be associated with low intake of antioxidant nutrients and high risk of metabolic syndrome in rural Korean women.

FPGA-Based Deep Convolutional Neural Network Accelerator Design Techniques for the Handwritten Number Recognizer

Yoo, Yechan,Park, Yoonjin,Kim, Injung,Yi, Kang American Scientific Publishers 2018 Advanced science letters Vol.24 No.3

Optimal timing of heart transplantation in patients with an implantable left ventricular assist device

Sohn Suk Ho,Kang Yoonjin,Hwang Ho Young,Chee Hyun Keun 대한이식학회 2023 Korean Journal of Transplantation Vol.37 No.2

Heart transplantation (HTPL) has been established as the gold-standard surgical treatment for end-stage heart failure. However, the use of a left ventricular assist device (LVAD) as a bridge to HTPL has been increasing due to the limited availability of HTPL donors. Currently, more than half of HTPL patients have a durable LVAD. Advances in LVAD technology have provided many benefits for patients on the waiting list for HTPL. Despite their advantages, LVADs also have limitations such as loss of pulsatility, thromboembolism, bleeding, and infection. In this narrative review, the benefits and shortcomings of LVADs as a bridge to HTPL are summarized, and the available literature evaluating the optimal timing of HTPL after LVAD implantation is reviewed. Because only a few studies have been published on this issue in the current era of third-generation LVADs, future studies are needed to draw a definite conclusion.

Toward Optimal FPGA Implementation of Deep Convolutional Neural Networks for Handwritten Hangul Character Recognition

Hanwool Park,Yechan Yoo,Yoonjin Park,Changdae Lee,Hakkyung Lee,Injung Kim,Kang Yi 한국정보과학회 2018 Journal of Computing Science and Engineering Vol.12 No.1

Deep convolutional neural network (DCNN) is an advanced technology in image recognition. Because of extreme computing resource requirements, DCNN implementation with software alone cannot achieve real-time requirement. Therefore, the need to implement DCNN accelerator hardware is increasing. In this paper, we present a field programmable gate array (FPGA)-based hardware accelerator design of DCNN targeting handwritten Hangul character recognition application. Also, we present design optimization techniques in SDAccel environments for searching the optimal FPGA design space. The techniques we used include memory access optimization and computing unit parallelism, and data conversion. We achieved about 11.19 ms recognition time per character with Xilinx FPGA accelerator. Our design optimization was performed with Xilinx HLS and SDAccel environment targeting Kintex XCKU115 FPGA from Xilinx. Our design outperforms CPU in terms of energy efficiency (the number of samples per unit energy) by 5.88 times, and GPGPU in terms of energy efficiency by 5 times. We expect the research results will be an alternative to GPGPU solution for real-time applications, especially in data centers or server farms where energy consumption is a critical problem.