폴리비닐 알코올-아조벤젠 유도체의 광 안정성에 관한 연구

朴泰坤,朴根浩 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-

The Synthesis of long chain fatty acid containing azobenzene(Cn-Azo-PVA) was optimized, starting from Cn-Azo(C14, C16, C18) compounds and the product of reaction containing azobenzene chromophores was investigated by ultraviolet spectro-photometery in chloroform solvent at the various temperature. In addition, Reversibility and stability of azo compounds have been measured by means of Ultraviolet and the structure of these compounds were ascertained by means of FT-IR and NMR. Long chain azobenzene derivatives in chloroform solution are induced phtoisomerization by u.v. and visible light irradiation. The solution of long chain fatty acids containing azobenzene(Cn-Azo-PVA) are possible of being applied to functional molecular devices such as photomemory and light switching.

유한요소해석을 이용한 란쥬반형 진동자의 변위해석

박민호,강도원,박태곤 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-

Piezoelectric ceramics can provide electro-mechanical transduction with high stresses but low displacement. To obtain lager displacements, several mechanical amplifying structures have been used. High alternating displacements can be obtained using resonant structure. In this paper, we calculated equivalent circuit of Langevin type ultrasonic vibrator and designed a vibrator whose resonant frequency is 50[㎑]. FEA (Finite Element analysis) was employed to calculate the resonant frequencies and maximum displacements of designed vibrators. The computer calculated resonant frequencies were approached to the designed one. As AC voltage input, the maximum displacements were shown sinusoidal changes. Terminal input admittance over a frequency range spanning the resonant frequency were calculated. ANSYS was employed to calculate resonant frequencies, displacements and terminal input admittance of vibrators

아조벤젠을 含有한 長鎖脂肪酸의 光異性化 現象에 關한 硏究

朴根浩,朴泰坤 國立 昌原大學校 産業技術硏究所 1994 産技硏論文集 Vol.8 No.-

The Synthesis of p-(p'-octadecyloxy phenylazo)-benzoic acid and p-(p'-hexadecyloxy phenylazo)-benzoic acid were optimized, starting from p-(p'hydroxy phenylazo)-benzoic acid and the product of reaction containing azobenzene chromophores was investigated by ultraviolet spectrophotometery in ethanol solvent at room temperature. In addition, UV absorption spectra of Langmmuir Blodggett(LB) film deposited on quartz plate have been measured and the structure of these compounds were ascertained by means of Ultraviolet and Fourier Transform Infrared spectra. Recrystallization of reaction product in the solvent results the experimental yield obtained about 62.93% p-(p'-octadecyloxy phenyl azo)-benzoic acid. Long chain azobenzene derivatives solution are induced photoisomerization by light irradiation. The LB film of azobenzene containing long chain fatty acids are possible of being applied to functional molecular devices such as photomemory and light switching.

웨이브렛 신경망을 사용한 I-PD 제어계의 위치 제어

박광현,하홍곤,고태언 東義大學校産業技術開發硏究所 2003 産業技術硏究誌 Vol.17 No.-

많은 제어기법들이 이산시간영역 제어계에서 제어성능을 개선하기 위해서 제안되고 있다. 이 제어기법들을 이용한 제어계에서 계의 응답특성은 제어기의 이득에 관계한다. 특히 외란이나 부하변동에 의해서 계의 응답이 변할 때 제어기의 이득을 재조정할 필요가 있다. 본 논문에서는 I-PD 제어기를 웨이브렛과 신경망으로 설계하여 웨이브렛 신경망의 신축과 이동의 변수값을 선택하여 I-PD제어기의 이득이 자동적으로 역전파 알고리즘에 의해서 조정되도록 하였다. 이 제어기를 직류 서보 전동기를 구동원으로 하는 위치제어계에 적용하여 제어기의 제어성능을 실험을 통해 그 유효성을 검증하였다.

p-Nitroazobenzene 함유한 Polyamic Acid의 합성과 수면상의 변위전류 측정

朴泰坤,朴根浩 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-

The synthesis of polyamic acid was studied to get optimized conditions. The spectrum of the product of reaction containing azobenzene chromophres was investigated by using ultraviolet spectrophotometry in various solvent at room temperature. Recrystallization of reaction product in ethanol solvent atomosphere results 73.2% monomer, 78.6% anhydride tetracarbonic acid, and 96% polyamic acid. Maxwell displacement current(MDC)measuring technique has been applied on the study of monolayers of polyamic acid. The displacement current was generated from monolayers on the water surface by monolayer compression and expansion. Displacement current was generated when the area per molecule was about 250Ųand 120Ų. The charge flow and Maxwell displacement currents were investigated in connection with monolayer compression cycles. It was found that The maximum of MDCs appeared at the molecular area just before the initial rise of surface pressure in both 1st and 2nd compression cycles.

p-(p'-Hydroxy phenylazo)-benzoic의 합성과 LB막 특성에 관한 연구

박태곤,송경호,박근호 國立 昌原大學校 産業技術硏究所 1993 産技硏論文集 Vol.7 No.-

The Synthesis of p-(p'- Hdroxyl phenly azo)- benzoic acid was studied to get optimized conditions. The spectrum of the product of reaction containing azobenzene chromophores was investigated by using ultraviolet spectrophotometery in acetone solvent at room temperature. In addition, UV absorption spectra of langmmuir Blodggett film deposited on quartz plate was measured, and the structure of these compounds were ascertained by measuring the ultraviolet and infrared spectra. Recrystallization of reaction product in the solvent( water:methanlo:acetone) atmosphere results 68% p-(p'- Hdroxyl phenly azo)-benzoic acid yield and the melting point of that was about 254-267°C (decomposition). The LB film of azobenzene derivatives with long alkyl chains shows some possibility to be applied to functional molecular devices such as photomemory and lignt switching

光셔터의 開發에 關한 硏究

朴泰坤 國立 昌原大學校 産業技術硏究所 1987 産技硏論文集 Vol.1 No.-

Transparent ceramics which have quadratic electro-optic effect are fabricated using hotpress. The microstructure of specimens are observed to search the vest way to improve the transmittance. The electro-optic characteristics are analyzed by investigating the ferroelectric properties and the possibility of application to optical shutter is examined by obtaining the on-off characteristics of specimens. To obtain the transparent ceramics it is necessary to eliminate the porosities by using PbO atmosphere. The light intensity as a function of electric field have butterfly type hysteresis curves because of its slightly large saturation remanent polarization and coersive field. On-off characteristics of optical shutter can be obtained by two electric fields. Construction of the optical shutter with composition which has slim hysteresis loop is desired for obtaining the off state by zero electric field.

상 요추 추간판 탈출증의 수술적 치료

조태현,송준혁,김명현,박향권,김성학,신규만,박동빈 梨花女子大學校 醫科大學 醫科學硏究所 2000 EMJ (Ewha medical journal) Vol.23 No.3

Objectives : Lumbar disc herniations at the L1-L2, L2-L3, and L3-L4 level are rare. The purpose of this study is to observe the variable clinical finding of upper lumbar disc herniations and to provide proper treatment modality. Patients and Methods : Between 1998 Jan. and 1999 Dec., seventeen patients with upper lumbar disc herniations who were undergone surgery in our institute were retrospectively evaluated. Patients were evaluated based on following factors : age, sex, aggravating factor, symptoms and signs type of disc herniation, type of surgery, and outcome of post-surgery. Results : The incidence of lumbar disc herniation at the level of L1-2, L2-3 and L3-4 is 6.1% with declining frequency as the level ascends. The peak age incidence is 6th decade in both sex. Preoperative symptomes and signs are variabe. In sixteen cases, posterior approach was done. In these cases, twelve cases were performed microscopic partial hemilaminectomy, and four cases with spinal stenosis were performed total laminectomy and posterior screw fixation with bone fusion. In one case, lateral extracavitary approach was done. In results of operation, fourteen cases showed more than good grade(82%). Conclusion : The age incidence of lumbar disc herniations at the level of L1-2, L2-3 and L3-4 older than lumbar disc herniations at the lower level of L4-5 and L5-S1. The signs and symptoms are variable. In our cases, most of the patients were performed posterior approach with microscopic partial hemilaminectomy except the patients combined spinal stenosis. One case was performed a lateral extracavitary approach because the risk of the cord and cauda equina injuries. The prognosis of upper lumbar disc herniations after treatment with only microscopic partial hemilaminectomy and diskectomy is comparable with the prognosis of lumbar disc herniations at the lower level.

Fe₂O₃첨가에 따른 0.04Pb(Y½Ta½)O₃-0.96Pb(Zr_0.52Ti_0.48)O₃세라믹스의 유전 및 압전특성

강도원,박태곤 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-

Dielectric and piezoelectric of the 0.04Pb(Y1/2Ta1/2)O3-0.96Pb(Zr0.52Ti0.48)O3 ceramics modified with Fe2O3 have been investigated. The dielectric and piezoelectric properties of the base composition were imporved markedly through selection of Fe2O3 additives in proper amounts. The composition 0.04Pb(Y1/2Ta1/2)O3-0.96Pb(Zr0.52Ti0.48)O3 obtained the dielectric constant(Er=1,425). Also, electromechanical coupling factors for planar(kp) and piezoelectric constant(d33) were obtained 0.50 and 294[pC/N] at the additives 0wt% Fe2O3, respectively. The mechanical quality factor(Qm) of 0.04Pb(Y1/2Ta1/2)O3-0.96Pb(Zr0.52Ti0.48)O3 + fe2O3(0.3wt%) is about 510.

The rs196952262 Polymorphism of the AGPAT5 Gene is Associated with Meat Quality in Berkshire Pigs

Woo Bum Park,Sang Mi An,Go Eun Yu,Seulgi Kwon,Jung Hye Hwang,Da Hye Park,Deok Gyeong Kang,Tae Wan Kim. Hwa Chun Park1. Jeongim Ha*.,Chul Wook Kim* 한국축산식품학회 2017 한국축산식품학회지 Vol.37 No.6

High-quality meat is of great economic importance to the pig industry. The 1-acylglycerol-3- phosphate-O-acyltransferase 5 (AGPAT5) enzyme converts lysophosphatidic acid to phosphatidic acid in the mitochondrial membrane. In this study, we found that the porcine AGPAT5 gene was highly expressed in muscle tissue, influencing meat characteristics, and we also identified a non-synonymous single-nucleotide polymorphism (nsSNP) (rs196952262, c.673 A>G) in the gene, associated with a change of isoleucine 225 to valine. The presence of this nsSNP was significantly associated with meat color (lightness), lower cooking loss, and lower carcass temperatures 1, 4, and 12 h after slaughter (items T1, T4, and T12 on the recognized quality scale, respectively), and tended to increase backfat thickness and the waterholding capacity. These results suggest that nsSNP (c.673A>G) of the AGPAT5 gene is a potential genetic marker of high meat quality in pigs.