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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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.

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.

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.

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.

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.

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.

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.

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.