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과 액상 형성에 의한 비납계 압전 (Na,K)NbO<sub>3</sub>-Ba(Cu,Nb)O<sub>3</sub> 결정립의 비정상 성장 거동 및 전기적 특성
임지호,이주승,이승희,정한보,박춘길,안철우,유일열,조경훈,정대용,Lim, Ji-Ho,Lee, Ju-Seung,Lee, SeungHee,Jung, Han-Bo,Park, Chun-kil,Ahn, Cheol-Woo,Yoo, Il-Ryeol,Cho, Kyung-Hoon,Jeong, Dae-Yong 한국재료학회 2019 한국재료학회지 Vol.29 No.4
$Pb(Zr,Ti)O_3$ (PZT) is used for the various piezoelectric devices owing to its high piezoelectric properties. However, lead (Pb), which is contained in PZT, causes various environment contaminations. $(K,Na)NbO_3$ (NKN) is the most well-known candidate for a lead-free composition to replace PZT. A single crystal has excellent piezoelectric-properties and its properties can be changed by changing the orientation direction. It is hard to fabricate a NKN single crystal due to the sodium and potassium. Thus, $(Na,K)NbO_3-Ba(Cu,Nb)O_3$ (NKN-BCuN) is chosen to fabricate the single crystal with relative ease. NKN-BCuN pellets consist of two parts, yellow single crystals and gray poly-crystals that contain copper. The area that has a large amount of copper particles may melt at low temperature but not the other areas. The liquid phase may be responsible for the abnormal grain growth in NKN-BCuN ceramics. The dielectric constant and tan ${\delta}$ are measured to be 684 and 0.036 at 1 kHz in NKN-BCuN, respectively. The coercive field and remnant polarization are 14 kV/cm and $20{\mu}C/cm^2$.
동적 물성치를 고려한 진공 인터럽터 충격특성의 영향인자 분석
임지호,송정한,허훈,박우진,오일성,안길영,최종웅,Lim, Ji-Ho,Song, Jeong-Han,Huh, Hoon,Park, Woo-Jin,Oh, Il-Seong,Ahn, Gil-Young,Choe, Jong-Woong 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.5
Vacuum interrupters in order to be used in various switch-gear components such as circuit breakers, distribution switches, contactors, etc. spread the arc uniformly over the surface of the contacts. The electrodes of vacuum interrupters are made of sinter-forged Cu-Cr materials for good electrical and mechanical characteristics. Since the closing velocity is 1-2m/s and impact deformation of the electrode depends on the strain rate at that velocity, the dynamic behavior of the sinter-forged Cu-Cr is a key to investigate the impact characteristics of the electrodes. The dynamic response of the material at the high strain rate is obtained from the split Hopkinson pressure bar test using disc-type specimens. Experimental results from both quasi-static and dynamic compressive tests are Interpolated to construct the Johnson-Cook model as the constitutive relation that should be applied to simulation of the dynamic behavior of the electrodes. The impact characteristics of a vacuum interrupter are investigated with computer simulations by changing the value of five parameters such as the initial velocity of a movable electrode, the added mass of a movable electrode, the wipe spring constant, initial offset of a wipe spring and the virtual fixed spring constant.
임지호,이상엽,신동원 제어·로봇·시스템학회 2024 제어·로봇·시스템학회 논문지 Vol.30 No.1
. This study investigated a mobile robot capable of navigating unbalanced road surfaces solely via its mechanical structure, utilizing an unbalanced road adaptation device. This adaptation device was designed by introducing a height adaptor to the existing suspension mechanism, with each component consisting of links and shock absorbers. With these components, the robot excelled in adapting to unbalanced road surfaces. To validate the performance of the designed robot, a degree-of-freedom analysis was conducted, and the robot’s driving stability was evaluated through driving simulations.
마이크로니들의 형태 및 적용방법이 약물의 피부 투과에 미치는 영향
임지호,이경록,이은주,조정원 충남대학교 약학대학 의약품개발연구소 2012 藥學論文集 Vol.27 No.-
The purpose of this study is to develop the microneedle using biodegradable and biocompatible polymer and to pioneer the new route of drug delivery through the research to apply the most desirable administration form of small molecules, peptides, proteins, genes, biological products including vaccines. Various biocompatible microneedles were manufactured. To apply drug to microneedle, drug formulation using ethylene vinyl acetate patch or polyacryl acid gel was developed. Drug permeation into rat skin based on the application method of patch or gel with microneedle was studied using Franz diffusion cell system. In vitro drug permeation results showed that the permeation by the application of hollow microneedle was not increased compared with solid microneedle. When G60 or G60*2 microneedle was used, the permeated amount of calcein was increased compared to when solid microneedle was used. The permeated amount of lidocaine HCl in 12 hr was increased when microneedle was used was increased. Skin irritation followed by microneedle showed there was little difference in the decrease of redness after microneedle application based on application time.