http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Stable Switching PD Control Using Hunt-Crossley Model for a Press Platform
Jeong-Un Nam,Yun-Jae Yang,Tae-Woong Yoon 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.8
This study proposes a switching proportional-derivative (PD) controller for a press platform for inspecting the surfaces of a wind turbine blade. We use the Hunt-Crossley model to represent the probe shape or the nonlinearity of the inspection platform. This model consists of a nonlinear spring and a damper; therefore, it is more accurate than linear spring-damper models. We prove the global asymptotic stability of a PD force feedback controller and a PD position feedback (force) controller. However, both the controllers suffer from implementationrelated problems. Specifically, the PD force feedback controller makes the impact force large, and the PD position feedback controller cannot easily measure small position changes when the platform contacts the surface. These problems of each controller are solved by switching the two controllers. The PD force feedback control and PD position feedback control are used when the platform is in the contact and noncontact states, respectively. Weprove that the proposed switching PD force/position feedback controller is globally asymptotically stable. Further, simulations show satisfactory performance resulting from stable switching between the two control schemes.
Jeong, Kwang-Un,Kim, Jang-Joo,Yoon, Tae-Ho The Polymer Society of Korea 2000 Korea polymer journal Vol.8 No.5
A novel diamine monomer, containing fluorine and phosphine oxide, bis(3-aminophenyl) 3,5-bis(trifluoromethyl)phenyl phosphine oxide (mDA6FPPO), was prepared via Grignard reaction, and utilized to prepare polyimides with dianhydrides such as PMDA, 6FDA, BTDA or ODPA, by the conventional two-step route; preparation of poly(amic acid), followed by solution imidization. The polyimides were characterized by FT-IR, NMR, and DSC with intrinsic viscosity and refractive index also being evaluated. A phosphine oxide containing monomer, bis(3-aminophenyl)phenyl phosphine oxide (mDAPPO) and a commercial 3,3-diaminodiphenyl sulfone (mDDS) were also used for comparison. The polyimides derived from mDA6FPPO exhibited high T$\sub$g/, excellent solubility and low birefringence.
Barrier Height at the Graphene and Carbon Nanotube Junction
Tae Geun Kim,Un Jeong Kim,Si Young Lee,Young Hee Lee,Yun Seop Yu,Sung Woo Hwang,Sangsig Kim Institute of Electrical and Electronics Engineers 2014 IEEE transactions on electron devices Vol. No.
<P>Graphene/carbon nanotube (CNT) junction barrier height was investigated using all-carbon field-effect transistor structure with graphene and single-walled CNT (SWCNT) network as source (S)/drain (D)/gate electrodes and as channel, respectively. SWCNT network channel was formed by dielectricphoresis process at the prepatterned graphene S/D electrodes. By analyzing the measured current-voltage characteristics by the diode circuit model, the Schottky barrier height at the graphene and CNT junction was found to be approximately 0.5 eV.</P>
Tae Ju Cho,Kee A Chung,Kwang Joon Lee,Un Seong Chung Nam Jeong Cho,Quae Chae 생화학분자생물학회 1992 BMB Reports Vol.25 No.7
Light enhances the expression of soybean rbcS genes, which encode small subunits of ribulose-1,5-bisphosphate carboxylase/oxygenases. To isolate soybean rbcS genes, a soybean λ cDNA library was constructed with mRNA from light-grown soybean seedlings. The cDNA library was screened using a pea rbcS clone as a probe, and several rbcS ≤DNA clones were isolated. The largest insert DNA from the rbcS λ cDNA clones was subcloned into pBluescribe+, and designated pGSS8. Nucleotide sequence analysis showed that the pGSS8 has a full-length cDNA insert containing 31 nucleotides of 5` untranslated region. The pGSS8 contains an open reading frame of 178 amino acids, including a transit peptide of 55 amino acids. When RNA samples from various soybean tissues were prepared and subjected to Northern blot hybridization, it was shown that the soybean rbcS genes are expressed in green tissues, particularly in leaves.