연령증가에 따른 혈압요소들의 좌심실비대 및 관동맥질환과의 관련성

박재석,박창규,박미영,박재형,김용현,나진오,신성희,서순용,홍순준,박성미,임홍의,김응주,서홍석,오동주,노영무 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.2

컬러모니터의 색상선호도 평가방법에 관한 연구

최재호 ( Jae Ho Choe ),박승옥 ( Seung Ok Park ),김흥석 ( Hong Suk Kim ) 한국감성과학회 1998 춘계학술대회 Vol.1998 No.-

This study investigated the evaluation method for the users`` color preference of CRT monitors. And also the users`` preference of the colors displayed on CRT monitor using the park``s color reproduction system was evaluated. Subjects conducted a series of psychophysical experiments to compare the colors displayed on a CRT monitor using the park``s system to the colors without the system, Three evaluation methods were investigated: comparing one colors of same hue with diverse luminance and saturation. the results showed that subjects preferred the colors reproduced using the park``s system, and thd evaluation methods significantly affected thd color preference.

應力波 放出信號의 周波數 스펙트럼 特性分析

朴正萬,朴勝玉,金洪錫 대진대학교 1993 大眞論叢 Vol.1 No.-

The effects of source, specimen and transducer frequency characteristics on the spectral content of acoustic emission signals were investigated. A substantial difference in the ball impact was detected. The fine structures of the signal spectra depended strongly on specimen resonances as well as transducer resonances. The frequancy spectra of the piezoelectric transducer, glass and PMMA plates were determined by a calibration system consisting of a breaking pencil lead and an optical probe. These transfer functions were used to calculate the source wave spectra due to dropping steel balls. The experimental source spectra were compared with theoretical predictions. The agreement between experiment and theory was good, although certainly not perfect.

칼라영상시스템에 의한 물체색 측정연구

朴勝玉,朴正萬,金洪錫,林在權 대진대학교 1993 大眞論叢 Vol.1 No.-

To simulate accurate spectral reflectance from the red-green-blue output of a video digitizing system, a set of basis functions were computed. 1565 reflectance spectra of the chips in the Munsell Book of Color(Glossy) were measured with a spectrophotometer in KRISS. The autocorrelation matrix of these samples was formed and the eigenvectors and the eigenvalues of this matrix were computed by using Karhunen-Loeve transformation.

자기조절학습전략 훈련이 독해학습부진아의 독해력과 학업성취도에 미치는 영향

홍숙희,박남수 대구대학교 사범대학 부설 교육연구소 2009 敎育硏究 Vol.4 No.2

고정식 교정 환자에서 전동치솔 효과에 관한 연구

박창헌,황현식,이기헌,홍석진 대한치과교정학회 2004 대한치과교정학회지 Vol.34 No.4

고정식 교정장치를 부착한 경우 장치주위의 치태 축적 가능성이 증가되고 이로 인해 치은염, 법랑질 탈회 등의 부작용이 초래 될 수 있는 바 치태 제거를 위한 효과적인 치솔질이 필요하다. 본 연구는 교정환자에서 일반적으로 사용되고 있는 치솔에 비하여 전동치솔이 구강위생에 도움이 되는지 알아보기 위하여 시행되었다. 고정식 장치에 의한 교정치료 예정인 환자 34명을 본 연구의 대상으로 하여 고정식 교정장치 부착 전에 치태지수, 치은염지수, 치은출혈지수를 측정하였다. 장치 부착 4주 후에 각 지수를 측정한 다음, 연구대상을 치솔의 종류에 따라 전동치솔군과 수동치솔군으로 임의 구분하여 수동치솔 또는 전동치솔을 사용하도록 구강위생교육을 각각 시행하였다. 이때 전동치솔의 경우 본체는 Braun Oral-B D9511을 브러쉬 헤드는 Braun Oral-B Ortho OD 15-1을 사용하게 하였으며, 수동치솔의 경우는 Butler G.U.M 124를 사용하게 하였다. 구강위생교육 4주 및 8주 후에 각 지수를 측정한 다음 시간 경과에 따른 전동치솔군과 수동치솔군의 구강위생 상태를 비교 분석하여 다음과 같은 결과를 얻었다. 1. 고정식 교정장치 부착 4주 후 치태지수, 치은염지수, 치은출혈지수 모두 증가 양상을 나타내었다. 2. 구강위생교육 후 치태지수, 치은염지수, 치은출혈지수 모두 감소 양상을 나타내었다. 3. 치은염지수, 치은출혈지수의 경우 감소양상이 수동치솔과 전동치솔군 간의 유의한 차이를 보이지 않았다. 4. 치태지수의 경우 수동치솔에 비해 전동치솔군에서 감소효과가 유의하게 크게 나타났다. 이상의 연구 결과는 고정식 교정장치로 치료받는 환자에서 전동치솔이 구강위생에 도움이 됨을 시사하였다. Patients with fixed orthodontic appliances frequently have increased levels of plaque accumulation leading to the possibility of gingivitis or enamel decalcification. Although many methods may be helpful in reducing dental plaque formation, the optimal mechanical removal of plaque is the most important factor during orthodontic treatment. The purpose of this study was to evaluate the efficacy of an electric toothbrush (with a specially designed orthodontic brush head) compared to a manual toothbrush in controlling plaque and gingivitis for patients with fixed orthodontic appliances. Oral hygiene status was measured in thirty-four patients using a plaque index, a gingival index and a bleeding index, before and four weeks after the attachment of fixed orthodontic appliances. Patients were randomly divided into two groups: electric and manual toothbrush groups. Oral hygiene instruction was given according to the type of toothbrush used. The Braun Oral-B D9511 with Braun Oral-B Ortho OD 15-1 brush head was used as the electric toothbrush while the Butler G.U.M. 124 was given as the manual toothbrush. After four and eight weeks, oral hygiene status was measured again. Through a comparison between the electric and the manual toothbrush groups, the following results were obtained. 1. All oral hygiene indices showed an increasing tendency after four weeks of fixed orthodontic appliance. 2. All indices presented a decreasing tendency four and eight weeks after oral hygiene instruction. 3. In case of the gingival index and bleeding index, the decreasing tendency did not show a statistically significant difference between the electric and the manual toothbrush groups. 4. The decreasing tendency of plaque index presented a statistically significant difference between the two groups, showing that the electric toothbrush was more effective in terms of oral hygiene. These findings suggest that an electric toothbrush is useful to orthodontic patients with fixed appliances.

콩의 개화기 전후 공급과 수용부위의 생장반응과 수량에 대한 질소의 효과

박재홍,송범헌,이철원,손석용,김홍식,박상일 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-

This study was conducted to examine the nitrogen effects on the growth responses, the nodulation, and the distribution of dry weight of plant tissues at major growth stages before and after the flowering stage, and to evaluate the yield components and yields with different nitrogen levels. Hwangkeum cultivar(Glycine max L mereill) was cultivated under five different nitrogen levels, 0, 2, 4, 6, 8, N Kg/10a. Stem length and branching number, which were investigated with different N levels at major growth stages, were rapidly increased for 14days for before and after the flowering stage compared to the other growth stages. They were clearly higher with treatment of 2 and 4 N kg/10a than those of other N treatments. Pod number was slightly increased from the flowering to beginning maturity. It was the highest in the treatment of 2 N Kg/10a. Comparing grain number per pod with different N levels, two grains per pod was much higher in all N treatments except for the treatment of 6 N Kg/10a. Dry weight of shoot(including leaf, stem, and pod) was rapidly increased from the flowering stage to the full seed stage and then gradually increased after the full seed stage, whereas the dry weight of root(including the nodule and root) was rapidly increased until to full pod stage and then linearly decreased from the full pod stage until the beginning maturity stage. Comparing dry weight with different N levels, the dry weight of shoot was the highest in the treatment of 4 N Kg/10a, while it of root was the highest in the treatment of 2N Kg/10a. The dry weight of nodule was the highest, 13.1 Kg/10a, at full pod stage. Comparing the dry weight of nodule with different N levels, it was increased to the application amount of 4 N Kg/10a and then clearly decreased with more application amount of N than 4 Kg/10a. The yield components which were mostly affected to the yield were pod number per plant and grain number per plant. They were 57.5 and 106.1, respectively, with treatment of 4 N Kg/10a, which showed the highest yield, about 266 Kg/10a. Comparing yield index with different N levels to the control, the yields with treatment of 2 and 4 Kg/10a were increased to 21% and 34%, respectively.

Cortisone이 복막탐식세포의 탐식기능에 미치는 影響에 關한 電子顯微鏡的 硏究

朴永寬,洪錫宰 慶北大學校 醫科大學 1972 慶北醫大誌 Vol.13 No.2

It is well known that the phagocytic action of the cells of the reticuloendothelial system plays and important role in the immunological reaction and as a barrier against foreign bodies. It is also known that when the reticuloendothelial system is blockaded by cortisone, adherence of the foreign bodies to the cell membrane of phagocytes, and initial step of phagocytic mechanism, and absorption of foreign body into the cytoplasm of phagocytes are considerably disturbed. An investigation was undertaken to study the phagocytic activity of the omental milk spots by light and electron microscopy. Sixteen albino rats, maintained on a stock diet, weighing 200.0gm. average, were divided into 3 experimental groups. Group 1. Control group. No intraperitooneal injection of india ink given. a. Two rats, untreated. b. 2 rats: A dose of 25 ㎎ of cortisone acetate was given intramuscularly for 6 consecutive days. Group 2. 6 rats: A single dose of 6.0㎖ of 2% india ink in normal saline was given once a day, intraperitioneally, for 3 consecutive days. Group 3. 6 rats: A dose of 25 ㎎of cortisone acetate was given intramuscularly, once a day, for 6 consecutive days. Starting on the 4th day, a 6.0㎖ of 2% india ink in normal saline, once a day, wa administered intraperitoneally, for 3 days. Each of the experimental rats were sacrificed 24 hours after the last treatment of india ink preparation from the groups 2 and 3. The control group was sacrificed simillarly. Then the greater omentum was extirpated and inspected for india ink pigmentation of the milk spots, followed by both light and electron microscopic examinations. The results were as follows: 1. Light microscopic observations: In the experimental group of rats treated with 25 ㎎ doses of cortisone acetate with a resulant reticuloendothelial system blockade followed by an intraperitioneal india ink injection (group 3), the degree of carbon particle phagocytic activity of omental milk spots was greatly diminished over the group of rats treated with india ink only (group 2). 2. Electron microscopic observations: The number of phagosomes in the cytoplasms of the phagocytes of the milk spots of the greater omentum was increased substantially in the group of rate treated with india ink only (group 2). In this group, a large quantity of carbon particles were found to be contained in the phagosomes. Although there was an increased number of phagosomes bearing carbon particles in the group of rats treated with 25㎎ doses cortisone acetate followed by india ink injection (group 3), the number of phagosomes in this group was less than in the group of rats treated with india ink alone (group 2). A considerable quantity of carbon particles were also found outside the cytoplasms of phagocytes for group 3. It can be concluded, therefor: The phagocytic activity of omental milk spots was greatly decimated but not completely inbibited when the reticuloendothelial system was blockaded by large quantity of cortisone administration.

두꺼운 圓筒殼으로부터의 音波 共鳴散亂

朴正萬,金洪錫,신홍기 대진대학교 1995 大眞論叢 Vol.3 No.-

The resonance scattering of acoustic waves from thick cylindrical shells is analyzed for the case of an air-filled glass shell immersed in water. This is done by using the model of an elastic plate, and by calculating resonance frequencies, dispersion curves, and attenuations of circumferential waves. We also discuss some experimental results that deal with the backscattering of acoustic waves by cylindrical shells obtained by using short pulse excitation and Fourier spectroscopy analysis. Resonance spectra of backscattered signals show peaks corresponding to thickness resonances.

Linear Combination Analysis Using GPS Data

Park, Woon-Yong,Lee, Dong-Rak,Back, Ki-Suk,Hong, Jung-Soo 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.28 No.2

We can process and compute the position, velocity and time by satellite signals of GPS. The signals are used to compute positioning of three dimensions and timing offset of the receiver clock when we can track the tour satellite signals at least. One of the specified aims is to use less expensive single frequency code/carrier phase GPS receivers, which are typically around half the price of dual frequency receivers. In the study, the author analyzed the accuracy and applicability of frequence linear combination using triangulation points evaluated distance limitation.