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모멘트법을 이용한 주기적 배열을 갖는 무한 크기의 주파수선택 표면(FSS) 해석
강봉수,강부식,김흥수 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
In this paper, infinite frequency selective surface comprised with rectangular plates which are arranged periodically is analyzed using Method of Moment based on Galerkin's method. In analysis, it is assumed that the plates are infinite thin perfect conductors. Based on this assumption, the reflection characteristics of the FSS is compared according to the polarization of plane-wave and the direction of incidence. In the results, the variation of reflection characteristics of the FSS highly depends on the direction of incidence when the polarization of the plane-wave is parallel to the plane of incidence, but the variation is nearly independent upon direction of incidence when the polarization of the plane-wave is perpendicular to the plane of incidence.
운동 강도의 차이가 흰쥐의 혈액 성분과 적혈구의 형태에 미치는 영향
김부환,김종오,지용석,최대원,윤진환,정일규,김영욱,오봉석 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4
This study was to investigate the effects on hematological indices and heinz body formation in various intensity, Male Sprague-Dawley rats were randomly divided into the control group, the low-intensity exercise group, nigh-intensity exercise group (n=7 in each group). Animals of the low-intensity exercise groups were put on exercise 30 min per 1 day, 5 days per week for 6-weeks. Animals of the high-intensity exercise groups were put on exercise 120 min per 1 day, 5 days per week for 6-weeks. Red blood cell count (RBC), hemoglobin (Hgb), hematocrit (Hct), mean ceil volume (MCV), mean hemoglobin corpuscular (MCH), mean hemoglobin corpuscular concentration (MCHC) were analyzed in automated hematology analyzer (ABX Hematology MICROS 60) from 10㎕ of whole blood. Erythrocyte morphology were evaluated in super vital (Brilliant cresyl blue stain) stained blood films. In the present results, Hg, MCHC in the high-intensity exercise group was significantly decreased compared with the different exercise intensity and the control group. MCV in the high-intensity exercise group was significantly increased compared with the different exercise intensity end the control group. Heinz body formation in the high-intensity exercise group was significantly increased compared with the different exercise intensity and the control group. In the present study, it can be suggested that intensity of exercise can influence hematological variables and heinz body formation. These findings suggest that high intensity exercise induces oxidative damage to erythrocyte.
현형환,김부연,류한봉 한국외국어대학교 외국학종합연구센터 부설 기초과학연구소 1996 기초과학연구 Vol.4 No.-
Streptococcus faecalis는 glucose, lactose등을 탄소원으로 잘 이용하였으며 glucose를 탄소원으로, yeast extract와 casitone을 질소원으로 구성된 배지를 사용하여 pH 7.0에서 control되는 fermentor 배양에서 optical density(660nm) 7.3(viable cell concentration 6.5×10(9) cells/㎖)이상의 높은 cell concentration을 얻을 수 있었다. Bacillus mesentericus의 sporulation을 최대화 하기 위한 발효 조건을 조사한 결과 glucose를 위한 최적 CaCl₂농도는 0.lmM이었다. Streptococcus faecalis rapidly fermented glucose and lactose as a C-source, and the maximum cell concentration was obtained when grown in a jar fermentor that contained YCG medium consisting of glucose as a C-source and casitone and yeast extracts as a N-source, and that was controlled at pH 7.0. From experiments to maximize the sporulation efficiency in Bacillus mesentericus, glucose caused the decrease in sporulation efficiency, and calcium chloride was stimulatory for sporulation, of which optimum concentration was 0.lmM.
강희용,양성모,김봉철,임재중,용부중 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
Cochlea is well known to have the ability to analyze a wide frequency and this ability seems to be caused to the Basilar Membrane(BM) configuration. However, the relationship between the Cochlea frequency-position map is not clear. In this paper, the three-dimensional BM model was made using the Finite Element Method. Then, an attempt was made to examine the influence of the BM configuration on the Cochlea frequency-position map.
수용성 및 가식성 콩 단백질/�틴 블렌드 필름 제조 및 물성 연구
김성철,신용섭,정세환,유성구,박인식,김봉식,신부영 한국공업화학회 2003 응용화학 Vol.7 No.2
The manufacture of edible/biodegradable films or coatings can potentially add value to soy protein, Such films can find using as edible or nonedible food packaging materials. The effect of soy protein film-forming solutions on film formation, tensile properties of soy protein/pectin blend films were changed significantly by the amount of glycerol and the ratio of soy protein/pectin. Moreover mechanical properties of soy protein/pectin-montmorillonite clay have been studied. Tensile strength and modulus decreases as the relative humidity increased while with increasing relative humidity elongation at break increased.
Bong Boo,Inosuke Koyano 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
The dissociative photoionization of nitrous oxide in the valence excitation/ionization region has been studied by using time-of-flight mass spectrometry coupled to linearly polarized synchrotron radiation in the range of 15 $\sim$ 36 eV. At critical ion detection angles of ${\rm 0^\circ}$, ${\rm 55^\circ}$ and ${\rm 90^\circ}$ with respect to the beam polarization, the ratios of the integrated intensities for fragment ions to that for the parent ion ${\rm N_2O^+}$ have been recorded as a function of the incident photon energy. Only the ratios of ${I_{\rm N^+}/I_{\rm N_2O^+}}$ and ${I_{\rm O^+}/I_{\rm N_2O^+}}$ measured at ${\rm 0^\circ}$ in the range from 25 to 34 eV are found to be larger than those obtained at angles of ${\rm 55^\circ}$ and ${\rm 90^\circ}$. The anisotropic angular distribution of the fragment ions is interpreted as being due to molecular photofragmentation related to the symmetry and the dynamics of the dissociation processes.
Fluorescence Spectroscopic and Time-Dependent Density-Functional Theory Studies of Diphenylsilane
Boo, Bong-Hyun,Lee, Jae-Kwang Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.3
We investigated fluorescence and fluorescence excitation of diphenylsilane (DPS) in a solution and molecular beams in combination with the aid of the DFT method. When the molecule was photoexcited at 250 nm in a cyclohexane solution, normal and excimer fluorescences were observed in the ranges of 260-320 and 330-450 nm, respectively. The fluorescence excitation spectrum indicates that the channel leading to the intramolecular excimer formation is not efficient in comparison with the normal fluorescence. Vibrationally resolved fluorescence excitation spectra were measured for the DPS molecules cooled in pulsed supersonic expansion of He in the range 262.2-271.7 nm, in which we can see several electronic excitation spectra exhibiting the electronic band origins. We found that the simulated absorption spectrum based on the time-dependent densityfunctional theory calculations accords well with the absorption spectrum.
Supersonic Free Jet and Ab initio Studies of Electronic-Vibrational Structures of Fluorene
Boo, Bong Hyun,Choi, Young Sik,Kim, Taek-Soo,Kang, Sung Kwon,Kim, Jae Ryong 충남대학교 기초과학연구소 1995 연구논문집 Vol.15 No.-
Laser-induced fluorescence (LIF) excitation spectra were measured for fluorene (FR) cooled in pulse supersonic expansions of He in the range 283.7-296.7 nm. Ab initio studies of FR have also been carried out for determining the electronic and vibrational structures by using the standard 3-21G basis sets. In the LIF excitation spectra of FR, highly resolved vibronic bands are observed having the band origin of 33,791 cm^-1. The vibrational bands above the electronic origin were assigned on the basis of the well-characterized electronic vibrational bands reported previously and of normal modes of vibrations derived by our HF/3-21G calculations.