닫혀진 보제 끈 이론의 새로운 양자화

한승기, Wu Ke, Zhang Yuan-Zhong 忠北大學校部設基礎科學硏究所 1987 自然科學硏究 Vol.1 No.1

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보통 콘크리트의 유동성평가에 슬럼프 및 슬럼프 플로우의 적합성 분석

송원루 ( Yuan Lou Song ),자오양 ( Yang Zhao ),한인덕 ( In Deok Han ),한동엽 ( Dong Yeop Han ),한민철 ( Min Cheol Han ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.1

This study has analyze the suitable area of slump and slump flow among the fluidity evaluation of concrete by measuring slum and slump flow variation according to unit quantity and fine aggregate percentage in a low W/C mix. The fluidity of concrete can be expressed well with the slump value when sump value is 122mm or less. On the other hand, the fluidity of concrete can be expressed more accurately with slump flow value when slump is 122mm or greater.

Genetic Screening for Mutations in the Chip Gene in Intracranial Aneurysm Patients of Chinese Han Nationality

Su, Li,Zhang, Yuan,Zhang, Chun-Yang,Zhang, An-Long,Mei, Xiao-Long,Zhao, Zhi-Jun,Han, Jian-Guo,Zhao, Li-Jun Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3

We performed a case-control study to investigate whether SNPs of CHIP might affect the development of IA in Chinese Han nationality. We believe we are the first to have screened IA patients for mutations in the CHIP gene to determine the association with these variants. The study group comprised 224 Chinese Han nationality patients with at least one intracranial aneurysm and 238 unrelated healthy Han nationality controls. Genomic DNA was isolated from blood leukocytes. The entire coding regions of CHIP were genotyped by PCR amplification and DNA sequencing. Differences in genotype and allele frequencies between patients and controls were tested by the chi-square method. Genotype and allele frequencies of the SNP rs116166850 was demonstrated to be in Hardy-Weinberg equilibrium. No significant difference in genotype or allele frequencies between case and control groups was detected at the SNP. Our data do not support the hypothesis of a major role for the CHIP gene in IA development in the Chinese Han population.

Meta-Analysis on the Association between Echo Intensity, Muscle Strength, and Physical Function in Older Individuals

Han Yuan,Maengkyu Kim 대한노인병학회 2023 Annals of geriatric medicine and research Vol.27 No.4

Background: The use of ultrasonographic echo intensity (EI) to evaluate skeletal muscle quality and its effects on strength, explosive power, and physical function (PF) in older individuals remains unclear. This meta-analysis evaluated the associations among EI, muscle strength (MS), and PF in older individuals. Methods: We conducted a systematic search of the PubMed, Embase, Web of Science, SPORT Discus, and CINAHL databases through October 2022 to identify primary studies examining the association between EI and MS/PF. Effect sizes were computed using a random-effects model and presented using forest plots. Pearson correlation coefficient (r) and I2 statistics were used to measure heterogeneity. Results: This meta-analysis included 24 patients. EI demonstrated a negative association with maximal strength (r=-0.351; 95% confidence interval [CI], -0.411 to -0.288; p<0.001) and explosive power (r=-0.342; 95% CI, -0.517 to -0.139; p=0.001) in older individuals. Handgrip strength also showed a significant negative correlation with EI (r=-0.361; 95% CI, -0.463 to -0.249; p<0.001). However, we observed only a small and non-significant negative association between EI and gait speed (r=-0.003; 95% CI, -0.083 to -0.077; p=0.943), and a weak non-significant correlation with the chair stand test (r=0.072; 95% CI, -0.045 to 0.187; p=0.227). Conclusion: Increased EI was associated with lower strength and power but not with gait speed or chair test performance in older individuals. Further large-sample studies with long-term follow-up are needed to improve frailty prediction and risk assessment in this population.

Sub‑synchronous resonance in grid‑forming PMSGs connected to series‑compensated networks

Han Jiang,Zhengchun Du,Xiaotian Yuan,Jinlong Han 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.4

The sub-synchronous resonance (SSR) characteristics and countermeasures of grid-forming permanent magnet synchronous generators (PMSGs) controlled by DC voltage synchronization control (DVSC) are investigated in this paper. First, smallsignal models of two PMSGs connected to a series-compensated network are established, where a recently developed gridforming control, i.e., DVSC is applied. Then, a modal-analysis method is conducted to evaluate the impacts of the control parameters, series compensation level (SCL), and electrical distances on stability. It is interesting to see that PMSGs with DVSC exhibit unstable SSR like traditional synchronous generators. Moreover, the dominant wind turbine (WT) is investigated using participate factor analysis. Then, a simple but effective SSR damping controller (SSRDC) is designed using feedforward control signals, which is only activated when SSR occurs. It is shown that the designed controller can provide strong damping support for SSR suppression. Electromagnetic transient simulations are performed in different scenarios to find the unstable SSR conditions, as well as to verify the correctness of the SSR analysis and the effectiveness of the proposed SSR damping scheme.

Fabrication of PHBV/Keratin Composite Nanofibrous Mats for Biomedical Applications

Yuan, Jiang,Xing, Zhi-Cai,Park, Suk-Woo,Geng, Jia,Kang, Inn-Kyu,Yuan, Jiang,Shen, Jian,Meng, Wan,Shim, Kyoung-Jin,Han, In-Suk,Kim, Jung-Chul The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.11

Keratin is an important protein used in wound healing and tissue recovery. In this study, keratin was modified chemically with iodoacetic acid (IAA) to enhance its solubility in organic solvent. Poly(hydroxybutylate-co-hydroxyvalerate) (PHBV) and modified keratin were dissolved in hexafluoroisopropanol (HFIP) and electrospun to produce nanofibrous mats. The resulting mats were surface-characterized by ATR-FTIR, field-emission scanning electron microscopy (FE-SEM) and electron spectroscopy for chemical analysis (ESCA). The pure m-keratin mat was cross-linked with glutaraldehyde vapor to make it insoluble in water. The biodegradation test in vitro showed that the mats could be biodegraded by PHB depolymerase and trypsin aqueous solution. The results of the cell adhesion experiment showed that the NIH 3T3 cells adhered more to the PHBV/m-keratin nanofibrous mats than the PHBV film. The BrdU assay showed that the keratin and PHBV/m-keratin nanofibrous mats could accelerate the proliferation of fibroblast cells compared to the PHBV nanofibrous mats.

A Study on the Relationship between Training Structure and Training Pass Rate in Human Resource Related Issues

Yuan Han Fang,Chao Yang Li 한국경영실무학회 2021 한국경영실무학회지 Vol.7 No.2

시장경제의 경쟁 속에서 기업들은 자원 의존에서 재능 기부로 점차 전환되고 있다. 인적 자본은 기업 발전의 핵심 요인이며, 인적 자원의 개발과 훈련은 시장에서 기업의 경쟁 우위가 될 것이다. 인재 분배의 종합적 최적화, 인재 양성 및 능력 개발 강화, 인재 우위의 합리적 활용이 기업의 전 략적 계획 실현에 도움이 된다. 따라서 인재 양성은 기업의 인력 운용에서 중요한 부분이 되었다. 본 연구에서는 훈련 구조와 훈련 합격률의 관계를 세 가지 측면에서 분석하였다. In the competition of market economy, enterprises gradually transform from resource dependence to talent endowment. Human capital is the core advantage of enterprise development, and the development and training of human resources will to a large extent become the competitive advantage of enterprises in the market. The comprehensive optimization of the distribution of human resources, the strengthening of talent training and ability development, and the rational use of talent advantages are conducive to the realization of the strategic planning of enterprises. Therefore, the training of talents has become an important part of the enterprise's human resources management. This paper analyzes the relationship between training structure and training pass rate from three aspects.

A Study on the Application of VR Technology in the Field of Electronic Commerce

Yuan Han Fang 한국경영실무학회 2021 한국경영실무학회지 Vol.7 No.1

4차산업혁명이 시작되면서 사회의 모든 산업이 변화하고 있고, 기술개발, 인공지능, 빅데이터, VR 기술 등 응용분야가 발전하고 있으며, 기술도 시간과 인건비를 크게 절약했다. 이 단계에서 컴 퓨터와 휴대폰의 사용이 보편화되고 있으며, 인터넷 쇼핑과 인터넷 구매는 우리의 삶을 더 쉽고 빠 르게 만든다. 비록 온라인 쇼핑은 저렴하지만, 그것은 당신에게 맞지 않을 수도 있고, 그리고 나서 사용자 경험에 영향을 미치는 환불을 신청할 수도 있다. 따라서 VR 기술을 적용함으로써 소비자 는 경험과 만족도를 높이고 자신이 직접 만든 제품을 더 정확하게 구매할 수 있다. 반면에 2020년 COVID-19는 우리에게 많은 불편함을 야기시켰다. 소비자들은 집을 보러 현장에 갈 수 없다. VR 기술은 이 문제를 쉽게 해결할 수 있다. VR안경을 가정이나 부동산 내 지정된 장소에서 VR안경 을 사용하면 실제 주택의 배치와 장식 효과를 시뮬레이션을 하여 시간을 절약할 뿐 아니라 감염위험도 예방할 수 있다. 우리의 삶과 건강은 COVID-19의 영향을 받고 있지만 하루빨리 VR 기술 이 전자상거래에 적용돼야 한다는 의미를 담고 있다. VR 기술이 전자상거래에 적용된다는 장점도 많지만 단점도 많다. 우리는 이 기술을 개선하고 발전시켜야 한다. 본 논문은 VR 기술의 적용에 대해 논의하고 VR 기술의 적용에 대해 설명한다. With the start of the Fourth Industrial Revolution, every industry in society is changing, technological development, artificial intelligence, big data, VR technology, and other applications, and technology has also greatly saved time and human costs. At this stage, the use of computers and cell phones is becoming more common, and Internet shopping and Internet buying make our lives easier and faster. Although shopping online is cheap, it may not be suitable for you and then apply for a refund that affects the user experience. Therefore, by applying VR technology, consumers can increase their experience and satisfaction and buy their own products more accurately. On the other hand, in 2020 COVID-19 has caused us a lot of inconveniences. Consumers can't go to the scene to see the house. VR technology can solve this problem easily. Using VR glasses, at home, or designated locations in real estate, through VR glasses, simulates the layout and decorating effects of real houses, saving not only time but also preventing the risk of infection. Our lives and health are affected by COVID-19, but it implies that VR technology should be applied to e-commerce as soon as possible. Although VR technology has many advantages in being applied to e-commerce, there are many disadvantages as well. We should improve and develop this technology. This paper discusses the application of VR technology and explains the application of VR technology.

Lack of Any Association of GST Genetic Polymorphisms with Susceptibility to Ovarian Cancer - a Meta-analysis

Han, Li-Yuan,Liu, Kui,Lin, Xia-Lu,Zou, Bao-Bo,Zhao, Jin-Shun Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.15

Objective: Epidemiology studies have reported conflicting results between glutathione S-transferase Mu-1 (GSTM1), glutathione S-transferase theta-1 (GSTT1) and glutathione S-transferase pi-1 (GSTP1) and ovarian cancer (OC) susceptibility. In this study, an updated meta-analysis was applied to determine whether the deletion of GSTM1, GSTT1 and GSTP1 has an influence on OC susceptibility. Methods: A published literature search was performed through PubMed, Embase, Cochrane Library, and Science Citation Index Expanded database for articles published in English. Pooled odds ratios (ORs) and 95% confidence intervals (95%CIs) were calculated using random or fixed effects models. Heterogeneity between studies was assessed using the Cochrane Q test and $I^2$ statistics. Sub-group analysis was conducted to explore the sources of heterogeneity. Sensitivity analysis was employed to evaluate the respective influence of each study on the overall estimate. Results: In total, 10 published studies were included in the final analysis. The combined analysis revealed that there was no significant association between GSTM1 null genotype and OC risk (OR=1.01, 95%CI: 0.91-1.12). Additionally, there was no significant association between GSTT1 genetic polymorphisms and OC risk (OR=0.98, 95% CI: 0.85-1.13). Similalry, no significant associations were found concerning the GSTP1 rs1695 locus and OC risk. Meanwhile, subgroup analysis did not show a significant increase in eligible studies with low heterogeneity. However, sensitivity analysis, publication bias and cumulative analysis demonstrated the reliability and stability of the current meta-analysis. Conclusions: These findings suggest that GSTs genetic polymorphisms may not contribute to OC susceptibility. Large epidemiological studies with the combination of GSTM1 null, GSTT1 null and GSTP1 Ile105Val polymorphisms and more specific histological subtypes of OC are needed to prove our findings.

Factors Associated with the Development of Decision Making Skills: A Case Study of Individual Sport Coaches

( Yuan Han Song ),( Teck Koh Koon ) 중앙대학교 학교체육연구소 2016 Asian Journal of Physical Education of Sport Scien Vol.4 No.1

Decision making in the sport setting has been an important topic of research, especially in the competitive environment where an appropriate decision from the coach or athlete can offer advantageous positioning that could make a difference between a win and a loss in a game. However, research investigating how coaches acquire and develop appropriate decision-making skills is still scarce. The purpose of this study was to investigate how and where coaches from individual sports learned their craft in decision making. Eight successful coaches aged between 28-38 years old (4 males, 4 females) with at least five years of coaching experience at the competitive level took part in this study. Thematic analysis of data from the individual interviews revealed three main sources from which coaches acquired and developed decision-making skills: (a) Past athletic experience and the understanding of game rules, (b) Personality traits such as self-reflection, resilience, and curiosity, and (c) External learning situations such as having a mentor and past coaches that provided guidance and logical thinking processes, as well as exposure to cultural norms of the sport. The results are discussed in relation to studies on expert coach development. Practical suggestions are also highlighted to facilitate the development of future coaches.