Energy Management of Household Microgrid with Multiple Energy Resources for Rural Area

Hui Yan,Nian Lv,Fang Zhuo,Hao Yi,Zhenxiong Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

The rural villages situated in the loess plateau of China often face with intermittency or even no electricity supply due to inconvenient geometrical location and enormous initial investment. However, renewable resources like solar energy are rich in such area, where microgrid with multiple energy resources is efficient for dealing with the power shortage. This paper proposes a scheme about hybrid household microgrid with multiple resources suitable for both islanded and grid-connected situations. The microgrid integrates photovoltaic, batteries and gasoline generator in source side and constructs AC and DC buses for different load requirements. The possible operation modes are analyzed and energy management strategies are proposed correspondingly. Finally, the microgrid platform has been established in laboratory. Several cases have been tested in experiment and energy management strategies in both islanded and grid-connected situations show good performance. Experimental results verify effectivity of this microgrid scheme and validation of proposed energy management strategies.

Comparative analysis of the ovarian transcriptome reveals novel insights into fertility differences in Large White sows

Huiyan Hu,Qing Jia,Bo Zhou,Jing Zhang,Zhiqiang Li,Zhongwu Liu 한국유전학회 2020 Genes & Genomics Vol.42 No.7

Background Fertility is the most important economic trait in sows, as it is critical for profitability. Considerable phenotypic variation in litter size exists in Large White sows. However, relatively little is known about the underlying molecular and genetic bases. Objective An experiment was conducted to screen key genes that affect the fecundity of pigs during the luteal (L) and follicular phases (F) of the estrous cycle. Methods Eight sows (n = 4 for high fertility sows and n = 4 for low fertility sows) were sacrificed on day 14 (day 1 = first day of estrus) after estrus in the L phase. Another eight sows were slaughtered on day 20 of the estrous cycle in the F phase. Sixteen ovarian tissue samples were collected at the different sacrifice time points. Total RNA extracted was used to construct the library and then sequence on an Illumina HiSeq X10 system. Differentially expressed genes (DEGs) between high and low fertility in Large White sows were identified, and their potential biological functions were analyzed using bioinformatics analysis. Results In total, 457 DEGs (161 up-regulated and 296 down-regulated genes) were detected in the ovarian tissues of the high and low fertility groups in the L phase of the estrous cycle. Furthermore, 475 DEGs (253 up-regulated and 222 downregulated genes) were identified in the F phase. Twenty-nine DEGs were common to both comparisons. Kyoto Encyclopedia of Genes and Genomes enrichment analysis showed that the DEGs were mainly associated with steroid biosynthesis, the Hippo signaling pathway, and lysosomes. Others, such as MSMO1, CYP27B1, and CTSB, were related to reproduction. Conclusion These results will contribute to a better understanding of the individual differences in fertility at the transcriptome level, which may provide useful information to explore new ways to improve fertility in pigs.

Theoretical and experimental investigation of the pressure ratio distribution and the regulation strategy of a two-stage turbocharging system for various altitudes operation

Huiyan Zhang,Xuyang Tang,Liansong Mu,Lei Shi,Kangyao Deng 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.3

Fixed two-stage turbocharging system matched at high altitude leads to engine performance deterioration at low altitudes due to unreasonable pressure ratio distribution between two stages. In this paper, a thermodynamic model of regulated two-stage turbocharging system is established. Theoretical analysis shows the pressure ratio distribution should lean towards a turbocharger with greater efficiency, and the high-altitude operation intensifies the role of HP stage. Experiments are conducted on an environment simulation test bench. Then, the optimal pressure ratio distribution and ETAR at various altitudes are proposed. Experiment results demonstrate that the turbocharging system boosts sufficient intake air with the optimal ETAR. Compared to that with the fixed turbocharging system, the maximum increment of the overall efficiency is 9.3 % at 0 m and attains 1.5 % at 3000 m. Consequently, the output torque is 100 % recovered below 3000 m, and it exceeds 91 % at 4500 m. Moreover, the optimal ETAR reduces the BSFC under low altitude conditions.

The establishment of a DNA fifi ngerprinting database for 73 varieties of Lactuca sativa capitate L. using SSR molecular markers

Huiyan Zhou,Penghang Zhang,Jiang Luo,Xueying Liu,Shuangxi Fan,Chaojie Liu,Yingyan Han 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.1

Head lettuce originating near the Mediterranean coast was introduced to China in the fi fth century. It is diffi cult to identifydiff erent varieties of head lettuce due to their close genetic relationships. Simple sequence repeats (SSR) technology is apractical method that has been widely used in variety identifi cation, fi ngerprint construction and genetic diversity analysis. In this paper, 23 pairs of SSR primers were selected to identify and analyse 73 varieties of head lettuce. The results identified a total of 117 mutated alleles detected in 23 loci, with the number of each loci ranging from 2 to 11, with an averageof 5.1 mutated alleles per locus. Additionally, 152 genotypes were detected in 23 loci, with an average of 6.6 genotypes perlocus derived from a range of 2–13. The polymorphism information content ranged from 0.071 to 0.702, with an average of0.499. The selected primer pairs could clearly refl ect the genotypic diversity level of the 73 head lettuce varieties tested, andcan be used in the detection and analysis of the head lettuce varieties. The results of our sequence analysis also showed thatthese 73 varieties of head lettuce could be eff ectively identifi ed by a combination of 19 primer pairs even though the geneticsimilarity among the 73 varieties ranged from 0.647 to 0.991, with an average of 0.798. Based on a capillary electrophoresisplatform, a DNA fi ngerprinting database of 73 head lettuce varieties was established.

The Importance of Allergen Avoidance in High Risk Infants and Sensitized Patients: A Meta-analysis Study

Wu Huiyan,Guo Yuhe,Wang Juan,Zhang Junyan,Zhang Xiaojun,Tao Ailin 대한천식알레르기학회 2014 Allergy, Asthma & Immunology Research Vol.6 No.6

Purpose: At this time, there is uncertainty regarding whether allergen avoidance is the most appropriate strategy for managing or preventing allergies. The purpose of this study was to evaluate the effectiveness of allergen avoidance in the prevention of allergic symptoms in previously sensitized patients and newborns that have the potential to develop allergies. Methods: We performed online searches of articles published from January 1980 to December 2012 in PubMed and The Cochrane Central Register of Controlled Trials, and selected articles involving randomized controlled trials (RCTs) and allergen avoidance. The parameters used to determine allergenic potential in newborns included the risk ratio (RR) of eczema, asthma, rhinitis, wheeze, and cough. The methods employed to evaluate previously sensitized patients were the standardized mean difference (SMD) of forced expiratory volume in 1 second (FEV1) and peak expiratory flow rate (PEFR). Data quality was assessed using the Jadad scale. Results: A total of 14 RCTs were identified. Meta-analysis demonstrated that allergen avoidance for newborns did not reduce the subsequent incidence of allergic diseases (eczema, P=0.21; rhinitis, P=0.3; cough, P=0.1) but significantly reduced the incidence of asthma and wheezing in high-risk infants (asthma, P=0.03; wheeze, P=0.0004). However, previously sensitized patients who reduced their exposure to known allergens did not show improvement in their lung functions (FEV1, P=0.3; PEFR morning, P=0.53; PEFR evening, P= 0.2; PEFR, P=0.29). Conclusions: Allergen avoidance may not always be successful in preventing allergic symptoms. However, rigorous methodological studies are required to confirm this hypothesis.

광섬유 브래그 격자 센서 기반 선천성망막질환 유전자 치료를 위한 망막의 정밀 탐측

양혜연(Huiyan Yang),김종현(JongHyun Kim),강요섭(Yosup Kang),류원형(WonHyoung Ryu) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11

중국 내 성인 뇌손상 환자 대상 음악중재 연구 고찰

Yu, Huiyan(于慧媛) 한국음악치료교육학회 2021 인간행동과 음악연구 Vol.18 No.2

본 연구에서는 중국 내 성인 뇌손상 환자를 대상으로 음악을 활용한 중재 연구들을 고찰하여 전반적인 특징과 음악중재 및 음악 특성에 대해 분석하였다. 연구 내 자료 선정기준에 따라 총 83편의 연구를 수집하여 분석한 결과는 다음과 같다. 2012년 이후 음악을 활용한 중재연구가 증가하였고, 이 중 무작위 대조군 연구설계가 가장 많았으며 뇌졸중 환자를 대상으로 진행한 연구가 가장 높은 비중을 차지하였다. 중재영역별로 분류한 결과 신체영역과 정서영역은 유사한 비중을 차지하였고, 음악치료사가 시행한 연구는 14편(24.5%)으로, 타 분야의 연구자에 의해 시행된 43편(75.4%)보다 적은 것으로 확인되었다. 중재 제공자의 전문 분야에 따라 중재의 특성에도 차이가 있었다. 타 분야 연구자가 중재한 연구들은 정서영역을 목표로 하여 기존의 녹음 음악을 사용한 감상 활동을 주로 진행 한 반면, 음악치료 전공자가 중재한 연구들은 신체영역의 목표를 위해 치료사가 재구성한 음악을 라이브로 제공한 경우가 많았다. 중재 내용의 기술 수준 및 기법의 적절성 평가 결과를 살펴보면 향후 중국 내 음악치료 연구에서 음악의 치료적 고유성과 중재자 전문성에 기반한 중재연구가 진행되어야 할 뿐 아니라, 연구 내 중재 기법을 구성하는 치료적 근거가 명확하게 기술되어야 함을 시사한다. This study reviewed the research in China on music interventions for adult brain injury patients. Eighty-three studies that met the inclusion criteria were included for analysis. Our review revealed that the number of intervention studies using music with adult brain injury patients has been on the rise since 2012, and random control research design methods have been dominant. Studies focused on the physical domain and emotional domain together were most common. Researchers in fields outside of music therapy conducted 43 of the studies, and music therapists carried out 14 of the studies as intervention providers. Most of the studies carried out by experts in fields other than music therapy used listening activities involving preexisting recorded music. However, most of the studies conducted by music therapists adopted reconstructed music and played it live during their intervention. The specificity of the described content of the interventions and level and relevance of stated rationale to the target goal of the intervention suggests that high quality of intervention was conducted with a therapist/investigator who has completed adequate professional education/training, which would emphasize the importance of music therapy professionalism. This study provides the baseline data for how music intervention research has been implemented in China and presents implications for future clinical practice and research.

Alendronate-Anionic Clay Nanohybrid for Enhanced Osteogenic Proliferation and Differentiation

PIAO HUIYAN,김명훈,Meiling Cui,최고은,최진호 대한의학회 2019 Journal of Korean medical science Vol.34 No.5

Background: Alendronate (AL), a drug for inhibiting osteoclast-mediated bone- resorption, was intercalated into an inorganic drug delivery nanovehicle, layered double hydroxide (LDH), to form a new nanohybrid, AL-LDH, with 1:1 heterostructure along the crystallographic C-axis. Based on the intercalation reaction strategy, the present AL-LDH drug delivery system (DDS) was realized with an enhanced drug efficacy of AL, which was confirmed by the improved proliferation and osteogenic differentiation of osteoblast-like cells (MG63). Methods: The AL-LDH nanohybrid was synthesized by conventional ion-exchange reaction and characterized by powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HR-TEM), and Fourier transform infrared (FT-IR) spectroscopy. Additionally, in vitro efficacy tests, such as cell proliferation and alkaline phosphatase (ALP) activity, were analyzed. Results: The AL was successfully intercalated into LDH via ion-exchange reaction, and thus prepared AL-LDH DDS was X-ray single phasic and chemically well defined. The accumulated AL content in MG63 cells treated with the AL-LDH DDS nanoparticles was determined to be 10.6-fold higher than that within those treated with the intact AL after incubation for 1 hour, suggesting that intercellular permeation of AL was facilitated thanks to the hybridization with drug delivery vehicle, LDH. Furthermore, both in vitro proliferation level and ALP activity of MG63 treated with the present hybrid drug, AL-LDH, were found to be much more enhanced than those treated with the intact AL. This is surely due to the fact that LDH could deliver AL drug very efficiently, although LDH itself does not show any effect on proliferation and osteogenic differentiation of MG63 cells. Conclusion: The present AL-LDH could be considered as a promising DDS for improving efficacy of AL.

중국인 한국어 학습자의 모바일 러닝에서 나타난 자기조절학습 양상에 대한 사례연구

양혜연 ( Yang Huiyan ) 서울대학교 국어교육과 2024 先淸語文 Vol.53 No.-

Mobile-assisted language learning attracts a growing number of foreign language learners with its increasing capacity and more sophisticated use. This trend has aroused the interests of many scholars, who have dedicated their efforts to explore learners' perception in this new context, to develop and evaluate learning tools, and to build up corresponding classroom models and educational methods. However, as to the learners' actual learning process, it remains an under-investigated topic, especially in the filed of Korean foreign language learning (KFL). This study aims to investigate Chinese KFL learners’ self-regulated learning patterns and the problems they face in mobile-assisted language learning. Specifically, three questions are to be addressed: what’re Chinese KFL learners’ self-regulated patterns in mobile-assisted language learning; what’re the problems in their self-regulated language learning; what measures should be taken to improve their learning experiences. The multi-case study method has been adopted to answer the questions. Six Chinese college students were selected who had studied Korean in educational institutions for one year in preparation for their overseas studies in Korean universities. Their mobile learning records are collected for analysis, and they are interviewed, along with their teachers. The press releases from educational institutions were collected as well. The data analysis reveals that Chinese KFL learners perform self-regulated learning in four aspects: selecting and integrating learning resources, establishing learning community in mobile learning environments, utilizing learning content with careful validation and creative organization, controlling the mobile learning environment. Meanwhile, some problems are revealed for their usage of mobile technology, which includes: failure to set clear learning goals, inability to utilize learning resources in a properly organized way, and the lack of interaction with teachers and classmates. Hence, it is suggested that educators should provide guidance for students’ self-regulated learning and promote more ways for interaction in the mobile learning environments. In all, this study is meaningful as it makes the first attempt to reveal Chinese KFL learners’ self-regulated learning patterns in mobile learning environments. However, the discoveries are only initial and more work should be done to better understand the new generation of learners who are proficient in using cutting-edge technology, and to come up with more efficient methods for teaching and learning in the mobile learning environment.

Does Industrial Policy Boost Corporate Cash Holdings?

Lili Wang,Huiyan Zhang 동아시아무역학회 2021 Journal of East Asian Trade(JEAT) Vol.3 No.2

Purpose – The purpose of this paper is proving that industrial policies promote corporate cash holdings due to the effective governance effect, which enriched the research on the influencing factors of cash holdings and the consequences of industrial policies. Design/Methodology/Approach – Based on the panel of A-share listed companies in Shanghai and Shenzhen stock markets from 2007 to 2019, the empirical evidence have researched the relationship of industrial policy and the cash hold of listed companies. Findings – This paper studies the relationship of industrial policy and the cash hold of listed companies. It is found that t the positive effect of industrial policy on cash holding is mainly due to the fact that industrial policy inhibits management’s excessive investment and perquisite consumption, and thus alleviates the “dissipative hypothesis” of cash holding. Research Implications – In the management of this paper, China attaches great importance to economic regulation by industrial policies. As an important form of economic regulation by the government, industrial policy plays a role in guiding the flow of social capital and optimizing the allocation of resources, thus promoting the adjustment of industrial structure and promoting economic transformation and upgrading.