Secure and structured IoT smart grid system management

Lim, Jiyoung,Doh, Inshil,Chae, Kijoon Inderscience Enterprises Ltd. 2017 International journal of web and grid services Vol.13 No.2

<P>The Internet of Things (IoT) has been developing rapidly and inspiring numerous applications that can improve daily life. Among these, smart grid systems are expected to efficiently distribute energy and help address the energy shortage problem. However, grid data and information from heterogeneous embedded devices may result in security and communication problems in an IoT environment. Even in the situation where low-level information causes interoperability problems, the devices should be able to communicate with each other in a safe and efficient manner without a server or human intervention. In this paper, we propose a security-based context-aware smart grid system using an energy usage data aggregation and context awareness. Our proposal allows for intelligent decision-making and provides efficient smart grid system management based on machine knowledge. Using our proposed method, a smart grid system can provide robust and secure services, which can defend the system against various outside attacks.</P>

Validity Verification of Team-Based Learning Model in Nursing History Education

JiYoung Lim,Wonjung Noh 한국간호과학회 2015 한국간호과학회 학술대회 Vol.2015 No.10

Inequalities in External-Cause Mortality in 2018 across Industries in Republic of Korea

Lim, Jiyoung,Ko, Kwon,Lee, Kyung Eun,Park, Jae Bum,Lee, Seungho,Jeong, Inchul Occupational Safety and Health Research Institute 2022 Safety and health at work Vol.13 No.1

Background: External-cause mortality is an important public health issue worldwide. Considering its significance to workers' health and inequalities across industries, we aimed to describe the state of external-cause mortality and investigate its difference by industry in Republic of Korea based on data for 2018. Methods: Data obtained from the Statistics Korea and Korean Employment Information System were used. External causes of death were divided into three categories (suicide, transport accident, and others), and death occurred during employment period or within 90 days after unemployment was regarded as workers' death. We calculated age- and sex-standardized mortalities per 100,000, standardized mortality ratios (SMRs) compared to the general population and total workers, and mortality rate ratios (RRs) across industries using information and communication as a reference. Correlation analyses between income, education, and mortality were conducted. Results: Age- and sex-standardized external-cause mortality per 100,000 in all workers was 29.4 (suicide: 16.2, transport accident: 6.6, others: 6.6). Compared to the general population, all external-cause and suicide SMRs were significantly lower; however, there was no significant difference in transport accidents. When compared to total workers, wholesale, transportation, and business facilities management showed higher SMR for suicide, and agriculture, forestry, and fishing, mining and quarrying, construction, transportation and storage, and public administration and defense showed higher SMR for transport accidents. A moderate to strong negative correlation was observed between education level and mortality (both age- and sex-standardized mortality rates and SMR compared to the general population). Conclusion: Inequalities in external-cause mortalities from suicide, transport accidents, and other causes were found. For reducing the differences, improved policies are needed for industries with higher mortalities.

The Effects of Video Distraction by Cellular Phone During Intravenous Injection in Preschoolers

Jiyoung Sohn,Youngmee Ahn,Hwasoon Kim,Jiyoung Lim 한국간호과학회 2009 한국간호과학회 학술대회 Vol.2009 No.10

Comparative study of the linkage disequilibrium of an ENCODE region, chromosome 7p15, in Korean, Japanese, and Han Chinese samples

Lim, Jiyoung,Kim, Young Joo,Yoon, Yongsook,Kim, Soon Ok,Kang, HyoJin,Park, Jungsun,Han, A. Reum,Han, Bokghee,Oh, Burmseok,Kimm, Kyuchan,Yoon, Bangwon,Song, Kyuyoung Elsevier 2006 Genomics Vol.87 No.3

<P><B>Abstract</B></P><P>The extent and pattern of linkage disequilibrium (LD) in the human genome provide important information for disease gene mapping. Previous studies have shown that LDs vary depending on chromosomal regions and populations. As the Asian samples of the International HapMap Project consisted of Japanese and Chinese populations, it was of interest whether we could use the HapMap data as a reference to carry out association studies of common complex diseases in a closely related population, such as Koreans. We have compared the LD and recombination patterns defined by single-nucleotide polymorphisms (SNPs) in ENCODE region ENm010, chromosome 7p15.2, in Korean, Japanese, and Chinese samples and further tested the robustness of tagSNPs among the Asian samples. We genotyped 792 SNPs in 500 kb (chromosome 7: 26699793–27199792, NCBI build 34) from 90 unrelated Koreans by fluorescence polarization detection and compared the data with Asian data from the HapMap project. Despite some differences in the position of high LD region boundaries, the overall patterns of LD were remarkably similar across the three samples, reflecting strong genetic affinities among them. Furthermore, the haplotype tag SNP transferability across the three samples was greater than 90%. Our results support the initial suggestion that the populations genotyped in the HapMap project might serve as reference populations for the selection of tagSNPs in association studies [The International HapMap Consortium, The International HapMap Project, Nature 426 (2003) 789–796. <ce:cross-ref refid='bib1'>[1]</ce:cross-ref>].</P>

Combined effect of work from home and work during nonwork time on sleep disturbance

Lim Jiyoung,Lee Hyundong,박재범,이경종,정인철,Jung Jaehyuk 대한직업환경의학회 2023 대한직업환경의학회지 Vol.35 No.1

Background: Owing to the coronavirus disease 2019 pandemic, being exposed to work from home and work during nonwork time simultaneously can lead to sleep disturbance; however, their combined effect is unclear. We aimed to investigate the combined effect of work from home and work during nonwork time on sleep disturbance. Methods: This study used data from the Sixth Korean Working Condition Survey and included 27,473 paid workers. Logistic regression analysis was conducted to investigate the relationship between work from home, work during nonwork time, and sleep disturbance according to sex. We re-classified participants into 4 groups based on their working from home (No/Yes) and working during nonwork time (No/Yes). The relative excess risk due to interaction was calculated to examine the effect of exposure to both telecommuting and nonregular work hours on sleep disturbance. Results: Workers exposed to work from home and work during nonwork time had significantly higher risks of sleep disturbance for all, men, and women workers (OR [95% CI]: 1.71 [1.46–2.02], 1.79 [1.43–2.23], and 1.64 [1.29–2.08] for work from home and 3.04 [2.70– 3.42], 3.61 [3.09–4.22], and 2.41 [2.01–2.90] for work during nonwork time, respectively). Compared to those who were not exposed to both factors, when workers had both job factors, the ORs (95% CI) of sleep disturbance for all, men, and women were 3.93 (2.80–5.53), 5.08 (3.21–8.03), and 2.91 (1.74–4.87), respectively. The relative excess risk due to interaction of work from home and work during nonwork time was not significant for sleep disturbance. Conclusions: Work from home and work during nonwork time were each associated with sleep disturbance, but the interaction between the two factors on sleep disturbance was not observed in both men and women.

Development of a Non-contact Input System Based on User's Gaze-Tracking and Analysis of Input Factors

Jiyoung LIM,Seonjae LEE,Junbeom KIM,Yunseo KIM,Hae-Duck Joshua JEONG 한국인공지능학회 2023 인공지능연구 (KJAI) Vol.11 No.1

As mobile devices such as smartphones, tablets, and kiosks become increasingly prevalent, there is growing interest in developing alternative input systems in addition to traditional tools such as keyboards and mouses. Many people use their own bodies as a pointer to enter simple information on a mobile device. However, methods using the body have limitations due to psychological factors that make the contact method unstable, especially during a pandemic, and the risk of shoulder surfing attacks. To overcome these limitations, we propose a simple information input system that utilizes gaze-tracking technology to input passwords and control web surfing using only non-contact gaze. Our proposed system is designed to recognize information input when the user stares at a specific location on the screen in real-time, using intelligent gaze-tracking technology. We present an analysis of the relationship between the gaze input box, gaze time, and average input time, and report experimental results on the effects of varying the size of the gaze input box and gaze time required to achieve 100% accuracy in inputting information. Through this paper, we demonstrate the effectiveness of our system in mitigating the challenges of contact-based input methods, and providing a non-contact alternative that is both secure and convenient.

리사이클 PET와 실크 복합소재를 활용한 뉴노멀 패션 파자마 개발

임지영(Jiyoung Lim),송영은(Young-eun Song) 한국의상디자인학회 2021 한국의상디자인학회지 Vol.23 No.4

터키인 학습자를 위한 한국어교육 연구 동향 분석

임지영(Jiyoung Lim) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.16

목적 터키인을 위한 한국어교육은 1989년 앙카라대학교에서 한국어문학과가 개설된 이래 본격적으로 시작되었다. 터키인 학습자를 대상으로 한 한국어교육 연구 성과는 지난 30년간 누적되었지만 연구 동향 분석은 아직 한 번도 이루어진 바 없다. 본 연구는 터키인 대상 한국어교육 연구 동향을 분석하여 지금까지의 연구 성과를 확인하고 앞으로의 연구 방향들을 탐색하고 논의하는 데 그 목적이 있다. 방법 연구 자료는 터키인 학습자 대상으로 연구된, 국내에서 출판된 학위논문과 학술논문, 총 58편으로 한정한다. 연구 방법은 분류 기준에 의한 질적 분석과 네트워크 언어분석을 통한 양적 분석으로 이루어진다. 결과 주제 분류 분석 결과, ‘교수 학습 57%>한국어 교육내용 34%>한국어 교육 일반 9%’ 순으로 연구가 많이 진행되었으며, 하위 주제는 ‘문법 22%>교재 16%>한국학 교수 14%>습득 및 학습(오류분석) 10%, 어휘 10%’ 순으로 많이 이루어졌다. 즉 문법, 어휘 등과 같은 기초 교육 내용 마련을 위한 연구, 실제 교수에 시급히 필요한 교재 연구가 주를 이루었으며, 한국학 연구의 비중이 큰 것이 특징적이다. 또한 네트워크 언어분석 결과, ‘대조, 오류, 교재, 문학’이 중심어로 드러났는데, 이는 앞선 주제 분류 분석 결과와 일치하며 연구 전반에 걸쳐 사용된 분석 방법인 ‘대조 분석’까지 도출되었다. 결론 이후 분석 결과에 근거해 한국어 교육 내용 및 교수⋅학습 면에서 향후 보완되어야 할 연구 방향을 제안하였다. Objectives Korean language education for Turks started in earnest in 1989 when the Korean Literature Department was opened at Ankara University. Research results in Korean language teaching on Turkish learners have accumulated over the past 30 years, but no analysis of research trends has yet been carried out. The aim of this study is to analyze research trends in Korean language education for Turks in order to confirm the attainments and discuss future directions of the research. Methods Research material is limited to 58 academic papers and articles published in Korea, which have been studied for Turkish learners. The research method consists of qualitative analysis based on classification criteria and quantitative analysis using network language analysis. Results “Teaching-Learning 57%,” “Korean Education Content 34%,” and “Korean Education General 9%.” The most studied sub-topics are ‘22% Grammar> 16% Textbook> 14% Korean Studies Professor> 10% Acquisition and Learning (error analysis) and 10% Vocabulary’. In other words, research aimed at the preparation of basic educational contents such as grammar and vocabulary, and the research on textbooks which is urgently needed for teaching proper was primarily centered on Korean studies. In addition, network language analysis revealed that “contrast, error, textbook, literature” were the central words. This was consistent with previous subject classification analysis results. And the analysis method used throughout the studies, ‘contrast analysis’, was derived. Conclusions Following the analysis of the topic clssification, numerous studies were conducted in the order of Based on the results of the analysis, we proposed Korean educational content and the direction of the research that should be complemented in the future in terms of teaching and learning.

세라믹막을 이용한 미생물연료전지의 전기화학적 특성 연구

임지영(Lim, Jiyoung),박대석(Park, Dae-Seok),김진한(Kim, Jin-Han) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.8

단일챔버 미생물연료전지에 분리막으로 세라믹막과 나피온막을 적용하여 전기발생특성을 분석함으로써 세라믹막의적용가능성을 구명하고자 하였다. 또한 환원전극으로서 백금촉매가 도포된 탄소천과 일반 탄소천을 사용하여 백금촉매 효과 및 전기발생특성을 비교하였다. 회분식 실험에서 전기발생특성이 가장 안정적인 것은 acetate를 기질로 사용하였을 때였다. Formate는 전기발생특성이 acetate보다 다소 높았으나 불안정하였고 propionate와 butyrate는 acetate에 비하여 전기발생량이상대적으로 낮았다. 환원전극으로서 백금촉매가 도포되어 있는 탄소천과 일반 탄소천을 비교한 결과 백금촉매가 도포된 탄소천의 전력발생량이 일반 탄소천에 비하여 1.2배 높게 나타났지만 약 5배 정도 비용 차이가 있음을 고려하면 미생물연료전지의 적용에 있어 효율성과 경제성은 함께 고려되어야 할 것으로 판단된다. 분리막으로서 세라믹막과 나피온막을 적용한 미생물 연료전지에서 발생한 평균 전압은 합성폐수를 이용한 실험에서 각각 523.67 mV ± 49.41 mV, 424.09 mV ± 79.95 mV이었다. 미생물연료전지에 분리막으로 세라믹막과 나피온막을 적용하여 전력발생 및 유기물제거효율을 비교한 결과, 세라믹막이 나피온막의 대안이 될 수 있음을 확인하였다. This study attempts to verify the applicability of ceramic membrane as a separator by comparing the power generation characteristics in single-chamber MFCs using ceramic membranes to those in the MFCs using nafion membrane. The generated power in MFCs by using acetate as a substrate was more stable than that by using formate, propionate and butyrate, respectively. It was shown that the generated power by using formate substrate in MFCs was unstable and a little higher than that by using acetate, and the power generated by using propionate and butyrate were lower than that by using acetate. In order to find out the Pt catalyst effect, it was compared the power generated in MFCs using Pt-coated carbon cloth as electrode to that power using normal carbon cloth. The power generated in MFCs using Pt-coated carbon cloth as electrode was 1.2 times higher than that using normal carbon cloth. The Pt-coated carbon cloth was about 5 times more expensive than normal carbon cloth. It is suggested that both power generation efficiency and cost together should be considered in selecting electrodes of MFCs. It was found that the ceramic membrane was superior to nafion membrane by comparing to the power generation characteristics obtained. It was shown that average voltage values were 523.67 mV ± 49.41 mV by using synthetic wastewater, in MFCs of ceramic membrane as a separator. While average voltage values were 424.09 mV ± 79.95 mV by using synthetic wastewater, in MFCs of nafion membrane as a separator. The organic removal efficiency, 41.7% by using ceramic membrane was a little bit higher than 40.8% by using nafion membrane. This research implies ceramic membrane can be a valid alternative to nafion membrane as a separator when considering the power generation and the efficiency of organics removal.