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

-본문참고-

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.

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.

In vitro Arsanilic Acid Induction of Apoptosis in Rat Hepatocytes

Yuan, Hui,Gong, Zhi,Yuan, li-Yun,Han, Bo,Han, Hong-Ryul Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.9

This paper aimed to study the toxicity of arsanilic acid on rat primary hepatocytes in vitro by a modification of the perfusion method. The conditions included concentrations of 0, 1.085, 10.85, 108.5, 1,085 and 10,850 mg/kg arsanilic acid in RPMI 1,640 medium at rat hepatocytes plates respectively, each group had five repeats at $37^{\circ}C$ for 48 h. The rat primary hepatocytes survival ratio, DNA Ladder, activities of glutathione peroxidase (GSH-px), superoxide dismutase (SOD) and catalase (CAT) in hepatocytes, activity of SOD in the medium and the expression of gene bax in hepatocytes were measured at 12 h, 24 h and 48 h respectively. The results showed that arsanilic acid decreased the activities of GSH-px and SOD, and increased the activity of CAT in all dosages, and affected as positive DNA ladder. Although the SOD activities of both hepatocytes and medium in 1.085 mg/L arsanilic acid were significantly lower than the base line at 12 h, CAT activity in 10.85 mg/L arsanilic acid was significantly higher than the base line at 48 h, and all of the DNA ladders were positive, which means 1.085 mg/L arsanilic acid induced apoptosis at 24 h. The gene expression of bax was significantly upregulated in 1.085 mg/L arsanilic acid or higher for 24 h.The parameters in 1,085 mg/L and 10,850 mg/L arsanilic acid had more severe changes than the others at any time indicating that these levels of arsanilic acid were toxic hazards for hepatocyte survival. It was concluded that arsanilic acid induced a dosage- and time-dependent gene expression of bax, 1.085 mg/L arsanilic acid could be involved in rat liver cell apoptosis at 24 h. Arsanilic acid as additives in livestock feed could present potential toxic implications for farm animals.

Interpretation of Long-Term Performance of Geogrids by Considering Interconnectivity Among Reduction Factors

Yuan-Chun Jin(김원춘),Sang-Hoon Park(박상훈),Ji-Yeon Han(한지연),A-Ram Lee(이아람),Yong-Jun Lee(이용준),Han-Yong Jeon(전한용) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11

Tensile properties of geogrid are affected by the creep, installation damage, chemicals etc. So, the long-term design strength of the geogrid reinforcement is reduced by these reduction factors. GRI-GG4 presented that total reduction factor is simply multiply of each factors. But in fact these reduction factors are complexly affected to long-term properties. And one factor can affect to another factor. In this paper combination effect of installation damage, creep resistance, chemical resistance was tested and found that the total reduction factor is lower than that of the calculated factor.

FORCE CONTROL RESEARCH OF ROBOT MANIPULATORS

Han, Huang Xin,Jun, Yuan,Yuan, 'Hu Jian 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1

In this paper, we present some research issues about theory and experiment of force control of robot manipulator in peg-in-hole assembly task, It includes:(a)Force analysis of Peg-in-hole process (b) The force controller design of Movemaster-EX manipulator (c) The force control experiments and conclusions.

Polysaccharide from Polygonatum Inhibits the Proliferation of Prostate Cancer-Associated Fibroblasts Cells

Han, Shu-Yu,Hu, Ming-Hua,Qi, Guan-Yun,Ma, Chao-Xiong,Wang, Yuan-Yuan,Ma, Fang-Li,Tao, Ning,Qin, Zhi-Hai Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.8

Inhibition of cancer-associated fibroblasts (CAFs) may improve the efficacy of cancer therapy. Polysaccharide extracted from polygonatum can selectively inhibit the growth of prostate-CAFs (p<0.001) without inhibiting the growth of normal fibroblasts (NAFs). Polysaccharides from polygonatum stimulate autophagy of prostate-CAFs. 3-methyl-adenine(3-MA) is an autophagy inhibitor. 3-MA was added to prostate-CAFs with polysaccharide from polygonatum to determine whether autophagy plays an important role in the restrained effect. Finally, polysaccharide from polygonatum treatment significantly increased the activation of Beclin-1 and LC3, key autophagy proteins. Polysaccharide from polygonatum stimulates autophagy of prostate-CAFs and inhibits prostate-CAF growth, indicating that a novel anti-cancer strategy involves inhibiting the growth of prostate-CAFs.

Translocation of residual ethoprophos and tricyclazole from soil to spinach

Yuan Xiu,Lee Junghak,Han Heeju,Ju Boeun,Park Eunyoung,Shin Yongho,Lee Jonghwa,Kim Jeong-Han 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.3

The dissipation of ethoprophos and tricyclazole in soil and their translocation tendency to spinach were investigated. Prior to field trials, the analytical method for the determination of these pesticide residues was optimized and validated on soil and spinach. The field trial was conducted under greenhouse conditions for two different pretreatment periods with the pesticides. After treating with pesticides 30 (PBI-30) and 60 days (PBI-60) before seeding, soil samples were collected on different days for the dissipation study of soil. Spinach samples were harvested from the soil, and 50% and 100% mature spinach samples were collected. The initial amounts of ethoprophos residue in the PBI-60 and PBI-30 soils were 0.21 and 2.74 mg/kg, respectively, and these both decreased to less than 0.01 mg/kg on the day of spinach harvest. Similar initial residues of tricyclazole were observed in the PBI-60 (0.87 mg/kg) and PBI-30 soils (0.84 mg/kg), and these decreased to 0.44 and 0.34 mg/kg, respectively. The half-lives of ethoprophos in the soils were calculated as 7.6 and 4.8 days, respectively, while relatively long half-lives of 36.5 and 77.0 days were calculated for tricyclazole. According to the pesticide residue amounts in the spinach, the translocation rate from the soil to the spinach was determined. In the case of ethoprophos, the residual amount was already rapidly degraded in the soil, and the translocation rate could not be confirmed. On the other hand, for tricyclazole, it was confirmed that 1.19 to 1.61% of the residual amount in soil was transferred to spinach. According to these results, safe management guidelines for tricyclazole in soil were suggested considering the maximum residue limit on spinach.

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.