• The Journal of Korean Physical Therapy
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• 제14권4호
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• pp.260-265
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• 2002

There are many methods for muscle strengthening. Muscle strengthening with eccentric contraction work is the best way by researcher's report. Also, eccentric contraction need proper resistance for muscle strengthening. Combination of isotonic in PNF is a muscle strengthening method with manual resistance. It makes concentric contraction $\rightarrow$ eccentric contraction $\rightarrow$ concentric contraction with continually and without muscle relaxation. Combination isotonic technique use with PNF pattern. Therefore, it will make development and increasing of active control motion, coordination, actual range of motion, strengthen and functional training in eccentric control of movement. Concentric contraction have the 3rd lever system and eccentric contraction have the 2nd lever system with combination of isotonic. Serial concentric contraction $\rightarrow$ eccentric contraction $\rightarrow$ concentric contraction make strong SEC and PEC. It will be increase elasticity of SEC, PEC and contractile components either.

• 분석과학
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• 제8권4호
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• pp.637-642
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• 1995

The presence of a porous Si layer(PSL) formed on the surface of crystalline silicon by electrochemical etclling in HF solution is found to enhance the stability of n-Si photoanodes, but porous n-Si thus formed is still liable to corrode upon exposure to excitation light. To improve the stability of the porous n-Si electrodes and to reduce the photo-induced corrosion, we have examined the PEC behavior of porous n-Si modified with polyaniline(PANI) and 3 nm thick layer of Au. Comparisons were made between Au/PSL and PANl/Au/PSL photoelectrodes.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2015년도 추계학술대회 논문집
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• pp.266-266
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• 2015

전 세계적으로 무한한 청정에너지 개발에 대한 연구가 주목받고 있다. 그 중, 수소에너지는 화석연료의 고갈과 환경문제를 동시에 해결할 수 있는 자원이며 수소 생산 방법 중에서도 태양에너지를 이용한 수소 생산 기술은 가장 이상적인 수소 생산 시스템이라 할 수 있다. 대표적인 광전극 소재로는 $WO_3$, ZnO, $Fe_2O_3$, $BiVO_4$ 등과 같은 무기 소재가 주로 사용되고 있으며, 최근에는 Si, CIGS 등과 같은 태양전지와 상기 광전극을 집적하는 탄뎀형 소재/소자가 개발되고 있다. 광전반응이 우수한 전도성 고분자는 광전기화학 전지의 소재로 개발되고 있다. 그러나 유기물의 수중 불안전성 문제 때문에 직접적으로 물에 침전시키는 것이 아니라 외부의 인가 전원용으로 그 사용이 제한적이다. 본 연구에서는 유기계 소재의 direct energy conversion을 위한 효율 및 수중 안정성 향상을 위하여 Ni계 촉매 및 그래핀옥사이드가 융합된 유기기반 광전기화학전지를 개발하였다.

• 설비공학논문집
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• 제14권10호
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• pp.781-785
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• 2002

The effects of different surfaces on dry and wet frosting test were experimentally investigated. The results of experiment were compared by the performance evaluation coefficient (PEC). Results showed that the air-side pressure drop of lacquer coated evaporator increased by 5% as compared to the plasma treated one. It was also found that the Plasma coated evaporator is lower than lacquer coated one in the PEC ratio.

• 대한의용생체공학회:의공학회지
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• 제17권3호
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• pp.291-296
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• 1996

Poly(ethylene glycol)(PEG) macromers terminated with diacrylate Iyoups and interpenetrating poly- mer networks(IPN) composed of poly(hydroxyethyl methacrylate)(PHEMA) or poly(hydroxyethyl methacrylate-co-hydronypropyl methacrylate-co- N-vinyl pyrrolidone ) [ P( HEM A-co- HPM A-co- NVP) ] and PEG macromer were synthesized with the aim of obtaining protein adsorption resistant soft contact lens. Polymerization of PEC macromer resulted in the formation of cross-linked gels due to the multifunctionality of macromer. Crosslinked P(HEMA) or P(HEMA-co-HPMA-co-WVP) chains were interpenetrated into the cross-linked three-dimensional networks of PEG. It was found that albumin adsorption onto the contact lens prepared by P(HEMA-co-HPMA-co-NVP) /PEG IPW decreases with an increase of molecular weight of PEG. Also, it was found that albumin adsorption onto the both contact lens decreases with an increase of concentration of PEC macromer in the IPN preparation. There are also more adequate in the bioinertnen for the contact lens by P(HEMA)/PEG IPN or P (HEMA-co-HPMA-co-NVP)/PEG IPN than that by P(HEMA) or P(HEMA-co-HPMA-co-NVP)

• KSBB Journal
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• 제7권1호
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• pp.45-50
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• 1992

항체 유도 염증 반응인 항체 매개형 과민 반응과 지연형 과민 반응은 족척 두께가 다당류에 의해 거의 정상 수준까지 회복되었다. anilline으로 유도한 methemoglobin의 함량도 거의 차이가 없었다. PFC/spleen cell과 PEC/$10^5$ slpeen cell의 경우 다소 증가를 나타내었으나, PEC는 뚜렷한 증가나 감소를 나타내지 않았으며, 적혈구 응집소가는 다소 증가하였으나 적혈구 용혈소가는 거의 차이가 없었다. 마우스의 plasma corticosterone의 농도는 사육실 및 다당류 투여에 따른 stress요소는 거의 없었다.

• Bulletin of the Korean Chemical Society
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• 제31권4호
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• pp.925-928
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• 2010

Nitrogen-doped $TiO_2$ ($TiO_2$:N) nano-particles with a pure anatase crystalline structure were successfully synthesized through the hydrolysis of $TiCl_4$ in an ammonia aqueous solution. The samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), $N_2$-sorption, and UV-vis diffuse reflectance spectra (UV-vis DRS) techniques. The absorption edge of nitrogen-doped $TiO_2$ shifted into the visible wavelength region. The photoelectrochemical (PEC) performances were investigated for the $TiO_2$ mesoporous electrodes doped with different nitrogen concentrations. The $TiO_2$:N electrodes exhibited much higher PEC responses compared to the pure $TiO_2$ electrode because of the significantly enhanced visible-photoresponsibility of the $TiO_2$:N electrodes.

• 한국환경보건학회지
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• 제31권4호
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• pp.241-245
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• 2005

Laccase catalyzes the oxidation and polymerization of aromatic compounds in the presence of molecular oxygen. Studies were conducted to characterize the use of polyethylene glycol (PEG) as an additive to keep up the enzymatic stability. The enzymatic activities highly remained and bisphenol A (BPA) was rapidly converted in the presence of 5 mg/l of PEC. These effects were accomplished with PEG of molecular weight 3,350. A linear relationship was found between the quantity of BPA to be converted $(10-120\;{\mu}M)$ and the optimum dose of PEC required for greater than $95\%$ conversion. This result suggests that it is the interaction between the PEG and the reaction products. In the optimum dose of PEG, the aeration of reaction mixture neither enhanced the conversion of BPA nor retarded the inactivation of the enzyme.

• Journal of Electrical Engineering and Technology
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• 제13권4호
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• pp.1644-1654
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• 2018

Eigenvalue distributions for a periodic metal-insulator-metal waveguide, classified into the point spectrum and the discretized continuous spectrum (DCS), are investigated as functions of frequencies, gap widths, and periods. Muller's method is suggested for solving exact eigenvalues, and we propose the scheme for finding proper initial values in the Muller's method by considering only ${\Re}e({\varepsilon}_r)$ in the dispersion equation. We then find that anti-crossing behavior, repulsive effect between the point spectrum and the DCS, becomes stronger when the real parts of the roots in the point spectrum have smaller values. Finally, we examine the transmittances of a single subwavelength slit for real metals using the mode matching technique. The transmittances in real metals similarly follow those of the perfect electric conductor (PEC) at low frequencies, while the patterns at higher frequencies begin to differ from the PEC.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 춘계종합학술대회
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• pp.587-589
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• 2005

본 논문은 현재의 인터넷에서 서비스하기 어려운 HDTV급의 고화질 영상의 다채널 비디오 스트리밍 서비스를 효율적으로 하는 방법에 대해 설명한다. 현재의 인터넷에서는 인터넷의 특성상 다채널스트리밍 서비스가 힘든 상황이며, 이러한 부분을 해결하고자 코덱을 개선하거나 QoS 매커니즘을 적용하는 방법이 제안되고 있다. 하지만 추후 HDTV의 보급확산에 따른 HDTV급의 다채널 스트리밍 서비스는 망의 대역폭 확장만으론 해결하기 힘든 부분이다. 이에 본 논문은 IPv6 프로토콜을 사용하는 차세대인터넷에서 HDTV급의 영상을 다채널로 스트리밍 하는 효율적인 방법을 제시하며, 이를 통해 사용자들은 인터넷망을 통해 다채널의 HDTV급의 영상을 서비스 받을 수 있게 된다.