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메틸메타크릴레이트와 디에탄올아민과의 에스테르 교환반응에 관한 연구 (Ⅱ)
박근호,손병청,정순욱 한국유화학회 1987 한국응용과학기술학회지 Vol.4 No.1
The transesterification reaction between diethanolamine and methyl methacrylate was kinetically investigated in the presence of various metal acetate catalysts at 120℃. The amount of reacted methyl methacrylate was measured by gas chromatography and liquid chromatography, and the reaction rate also measured from the amount of reaction products and reactants under each catalyst. The transesterification reaction was carried out in the first order with respect to the concentration of diethanolamine and methyl methacrylate, respectively. The over-all order is 2nd. The apparent rate constant was found to obey first-order kinetics with respect to the concentration of catalyst. The maximum reaction rate was appeared at the range of 1.4 to 1.6 of electronegativity of metal ions and instability constant of metal acetates.
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.
정관 절제한 백서 고환의 형태학적 변화 : 술후 6 개월까지의 관찰 until 6 months
박근호,최찬,문영회,문형배 圓光大學校 醫科學硏究所 1989 圓光醫科學 Vol.5 No.1-2
Vasectomy is widely used as male contraception. There has been controversy about the effects of vasectomy on testicular morphology. Some insist that vasectomy does not alter the testicular morphology, but others persist that it does alter, and still others assert that it may alter. The purpose of this study is to evaluate the effects of vasectomy on testicular morphology. The structures of seminiferous tubules, number of spermatids per tubule and minimal diameter of tubule were measured at intervals up to 6 months after bilateral vasectomy in rats. The structures of seminiferous tubules were different from those of control groups up to 3 months, but were same at 6 months. The number of spermatids per seminiferous tubule and minimal diameter of seminiferous tubule were same as those of control groups until 6 months.
박근호,박지훈,김형남 한국전자파학회 2022 Journal of Electromagnetic Engineering and Science Vol.22 No.1
The constant false alarm rate (CFAR) has been widely used in radar systems to detect target echo signals because of its simplicity. With the recent development of different types of neural networks (NNs), NN architecture-based target detection methods are also being considered. Several studies related to NN-based target detectors have introduced multi-layer perceptron-based and convolutional neural network (CNN)-based structures. In this paper, we propose a CNN-based target detection method in frequency modulation (FM)-band passive coherent location (PCL). We improved the detection performance using a maxpooling layer and a Hadamard division layer, which are parallelly placed with a CNN layer. Moreover, in our method there is no need to determine the specific cell configuration (e.g., cell under test, reference cells, and guard cells) because the proposed method obtains the trained kernels by end-to-end learning. We show that the trained kernels help in the extraction of either signal or noise components. Through the simulations, we also prove that the proposed method can yield an improved receiver operating characteristic compared to that of a cell-averaging CFAR detector for FM-band PCL in a homogeneous environment.
기능성 폴리이미드막 제작에 따른 수면상의 장쇄 알킬아민의 변위전류에 관한 연구
박근호,김덕술 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.2
Displacement current measuring technique has been applied on the study of monolayers of functional polyimide containing azobenzene derivatives. 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 70A°^2 and 100 A°^2. Displacement currents were investigated in connection with monolayer of long chain alkylamines. It was found that the maximum of displacement current appeared at the molecular area just before the initial rise of surface pressure in compression cycles of polyamic acid and long chain alkylamines.
박근호,안승두 한국산업안전학회 1996 한국안전학회지 Vol.11 No.3
This study is a survey on the effect of working security and worksite environment connected to the worst case of noise and dust which was generated in the manufacturing workshop of machinery and casting. The noise intensity of the manufacturing process tends to increase up to the limited strength of 90dB (A) or the higher during the last 4∼5 years in 1990∼1994. This result requires a significant improvement of worksite environment of unit workshop. The concentration of dust in the gouging process tends to increase to a significantly high level compared with other worksite, which also requires a local ventilation method to reduce the dust diffusion. Organic solvents used most frequently in the manufacturing process machinery were the aromatic hydrocarbons, but were gradually diversed in recent years.