• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1997년도 춘계학술대회 논문집
• /
• pp.1068-1072
• /
• 1997

This work deals with on investigation the influence of various additives to a base stock cutting fluid in order to develop a better deep hold drilling. This investigation has been aiming at developing an oil which gives a maximum cutting efficiency at a minimum wear rate of the tool and the guiding pads. The purpose of study is to analyze how guide pad of tools, workpiece and the change of contained quantity of extreme pressure additive in cutting fluids have effects on the hold over size of cutting hole, surface roughness of workpiece,wear rates of guide pad and roundness during the deep hole machining of SM55C with solid BTA drill by using BTA drilling system through experiment. Conclusion reached is as follows. It has been proved that the contained quantity of surphur more affects machinability than that of extreme pressure additive of chlorine of cutting fluid in BTA drilling during Deep Hole Drilling. Considering its base oil, the the contained quantity of extreme pressure assitive of surphur can be different, but it's judged that the range of 1.5 ~ 2.0% is suitable to machinability for workpiece in BTA drilling. Regarding guide pad, it's judged that the reduction of wear is possible in propotion to the contained quantity of exrreme pressure additive of chlorine against supporting of cutting force and Bumishing operation of machining parts in cutting.

• 대한지역사회영양학회지
• /
• 제2권2호
• /
• pp.246-255
• /
• 1997

This study was designed to find out opinions about free congregate site meals that the program served to improve nutritional status of low socio-economic elderly. This study was conducted in Sungnam-shi. The purpose of this study provided the baseline data to extend the meal service program in this area. Five hundred samples were selcted by the propotion of population in three districts(Sujung-gu, Jungwon-gu, Bundang-gu). The result were as follows. 72.8$\%$of subjects were women and 27.2$\%$of subjects were extended family type. Seventy$\%$ of respondant were not aware of the free meal service for elderly. Major channels of information about free meal service were mass media(33.8$\%$)and advertisement material from city (24.3$\%$). The rate of recognition and channels of information about free meal service were different according to demographic characteristics of subjects. Sixty-eight of subjects pointed that the meal service program was highly necessary in these areas and the necessity of the program was not significantly different by socio-economic variables. The group who know about free meal service had a positive attitude toward supporting the meal service program. Women preferred labor volunteers(46.8$\%$)at meal service center and men preferred donations. According to levels of education each group preferred different types of surpport for free congregate site meals for elderly. (Korean J Community Nutrition 2(2) : 246~255, 1997)

• 한국응용과학기술학회지
• /
• 제12권2호
• /
• pp.107-113
• /
• 1995

Benzoyl styrene derivatives were synthesized by Claisen-Schmidt condensation. It was measured that nucleophilic addition of thiourea for benzoyl styrene made use of ultraviolet spectrophotometery at a wide pH $1.0{\sim}13.0$ range in 5% $dioxane-H_2O$ at $40^{\circ}C$. On the basis of general base catalysis, substitutent effect, and confirmation of addtion reaction product, the nucleophilic addtion kinetics of thiourea for benzoylstyrene derivatives were measured by pH change. It maybe concluded that a part was unrelated to pH and another part was in proportion to concentration of hydroxide ion : Above pH 10.0. It was in propotion to concentration of hydroxide ion, a part having no concern with pH was added to the neutral thiourea molecule. From the results of measurement the reaction rate and there findings, nucleophilic addition of thiourea to benzoylstyrene derivative was proposed a fitting mechanism.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1995년도 하계학술대회 논문집 A
• /
• pp.443-445
• /
• 1995

Since the residential load is an AC load, while the output of solar cell is a DC power, the photovoltaic system needs the DC/AC converter to utilize solar cell and must provide the sinusoidal wave current and voltage with unity power factor in the case of driving to Interact with utility line. It is always necessary for the output of solar cell to operate in the vicinity of maximum power point, since it is greatly fluctuated by insolation. This paper treats that we will constitute a single phase PWM voltage source inverter and trace the modulation index which always maximize the output of solar cell in propotion to insolation variation and prove it by simulation that we can provide current wave, which is nearly sinusoidal wave with unity power factor, for load and utility line.

• 한국응용곤충학회지
• /
• 제15권3호
• /
• pp.133-136
• /
• 1976

경남북 전매지청관내 14개조합 산하 51개 포장에서 담배 기생선충을 조사한 결과를 요약하면 다음과 같다. 1. 조사 포장에 대한 선충의 검출률은 $96.1\%$이었다. 2. 선리속별 검출포장수는 Tylenchus가$82.3\%$로 가장 높고 다음이 Aphelenchus$72.5\%$, Tylenchorhynchus $58.8\%$, Meloidogyne $50.9\%$, Criconemoides $25.4\%$ Pratylenchus, Hirschmaniella $23.5\%$의 순이였다. 3. 지역별 선충속별 밀도는 Pratylenchus는 영덕이 43으로 가장 높았고 Tylenchorhynchus는 진보, 금천, 영양, 영천이 46-48로 높았으나 전지역에서 검출되었다. Tylenchus는 영일 408, 김천 372, 상주 281의 순이나 전지역에서 검출되었다. Meloidogyne는 진보를 제외한 전 지역에 나타났으나 금천이 168로 가장 높았다. Xiphinema는 의성이 26으로 가장 높고 다음이 상주 12, 영덕 7의 순이였다. 우리나라에 있어서 담배에 기생하는 선충은 11과 16속 18종이 발견되였으며 이중 12종은 우리나라 담배에서는 처음으로 발표되었다.

• Journal of the Korean Wood Science and Technology
• /
• 제17권3호
• /
• pp.20-27
• /
• 1989

This experiment was made to find the peripheral variations of annualring widths, the cell dimensions, microfibril angles and bulk densities within each annual-ring of horizontal-growing young tree of beech(Betul a platyphylla var. japonica) and Oak (Quercus variabilis) from the tension to the opposite side. Also a comparision between the features of the obnormal annual ring for horizontal-growing year and normal annual ring for the straight-growing years was made. The dimension of propotion of the element, the microfibril angles and the bulk density decreased or increased continuously toward opposite side which showed minimum or maximum value. The dimension of elements the microfibril angles and the bulk density decreased or increased continuously towards opposite side which showed minimum or maximum value. The dimension of elements. the microfibril angles and the bulk density in the normal annual rings were similar to those in the lateral woods. whereas were significantly more different in the tension wood than in the opposite wood. The features of typical opposite wood in the hardwoods were influenced by the locations within the inclined stems than effects of the decrease in the annual ring width. The oppostie woods in hardwoods did not conform to the tension wood and lateral wood. The abnormal annual ring included the opposite wood, lateral wood similar to normal wood and tension wood having specialized structure even in the same annual ring.

• 한국가축번식학회지
• /
• 제20권2호
• /
• pp.163-170
• /
• 1996

The effect of several potential antioxidants and amino acids were examined as a means of increasing the development of in vitro matured and in vitro fertilized oocytes into morulae or blastocysts. Bovine embryos developed to the 2~8 cell stage after in vitro fertilization were cultured for 5 to 6 days at 39$^{\circ}C$ in CR1aa containing varing concentraton of the antioxidants and amino acid in a gas phase consisting of 5% CO2, high humidified air. At 5~6 days, embryo developments were reduced, and embryos were fixed and stained with Hochest 33342 DNA stain to facilitate counting of cells. In experiment 1, the proportion of embryos developed to morulae and blastocysts in CR1aa containing 1mM, 2.5mM taurine (22.6% and 20.4%) was slightly higher than those of 0, 5 and 10mM Taurine (5.7, 5.7 and 3.9%, P<0.05). In experiment 2, addition of glutathione did not improve blastocyst development (P>0.05). In experiment 3, concentations of superoxide dismutase(SOD) ranging from 300 to 1,000 U did not affect the propotion of embryos developing into blastocysts (P>0.05). In experiment 4, addition of 250 U catalase(38.5%) was slighty higher than those of 0, 500 and 1,000U. In experiment 5, the proportion of embryo developed beyond morula stage in CR1aa with taurine plus EDTA was slighty higher than other treatments(15.7, 26.0 and 29.2%), there were no significantly increases in cell number among treatments(P>0.05). These results are indicating that antioxidants and amino acids can increase the proportion of embryos that develop into morulae and blastocysts, but did not increas in cell number of blastocysts.

• Journal of Nutrition and Health
• /
• 제18권2호
• /
• pp.83-89
• /
• 1985

본 실험은 식이를 통한 콜레스테롤의 섭취가 흰쥐의 혈장 지단백 분획에 어떻게 영향하는지 또한 이때에 혈장 콜레스테롤 농도와 조직의 콜레스테롤 함량은 어떻게 변화하는지를 관찰하기 위하여 실시되었다. 총에너지의 12%를 옥수수기름으로 공급하는 식이에, 콜레스테롤 무첨가군을 대조군으로 하고 각각 0.2%, 0.5% 및 1.0%의 콜레스테롤 첨가군을 실험군으로 하였다. 상기 실험식이를 갓 이유된 Sprague-Dawley계통의 암쥐 및 숫쥐에게 4주간 자유급식시켰다. 실험결과 혈장 총 콜레스테롤 농도는 콜레스테롤 급여에 따른 영향을 나타내지 않았으나 지단백 분획은 유의한 반응을 나타내었다. 즉 식이 콜레스테롤의 급여 수준이 높을수록 ${\alpha}-lipoproteins$(HDL) 분획비는 점점 감소되었고 ${\beta}-lipoproteine$(VLDL+LDL) 분획비는 점차 증가되었다. 한편 조직의 콜레스테롤 함량은 간장과 골격근의 경우 유의한 증가를 보였다. 간장의 콜레스테롤 함량은 식이 콜레스테롤의 급여수준과 비례하여 증가하여 1.0% 첨가군의 경우 무첨가군에 비하여 약 7배의 축적량을 나타내었다. 그러나 골격근의 축적량은 약 1.5배 내지 1.9배 정도로 제한되었다. 반면 지방조직의 콜레스테롤 함량은 외인성 콜레스테롤의 섭취에 영향받지 않았다.

• 대한방사선기술학회지:방사선기술과학
• /
• 제1권1호
• /
• pp.44-54
• /
• 1978

This study was carried out with statistical materials during the last two years of period from Jan. 1975 to Dec. 1976 which presented at radiologic department of 5 hospitals in Seoul City. The primary purpose of this study was to obtained more detailed informations related to the activities of radiologic technologists in diagnostic X-Ray examinations part and to provide some basic materials for managements in activities of then and manpower managements of their organization and practice. From the results of this study, the following conclusions were obtained [1] During two year from the January of 1975 to the December of 1976, total number of case in X-ray examinations were 464,830 case and 22,029 case in 1975 and 24,461 in 1976. And ratio of icreased in X-Ray examinations by year was 11.09 per cent. [2] Regarding the examined portion of X-Ray examination, a great propotion was chest examination as 56.88 per cent. [3] An average, the required time per case in X-Ray exam. was 9.28 minutes and make used of 1.94 sheets of X-Ray film per case in radiography. [4] An average, ratio of increased in X-Ray film by year was 12.71 per cent and ratio of failed film in it was 2.23 per cent. [5] The frequency rate of film size showed the highest distribution of $8"{\times}10"$(28.17%) and the highest distribution of X-Ray film by month was July(8.93%). [6] An average, the amount of activities per a diagnostic X-Ray equipment was 34.92 case and make used of 67.81 sheets of X-Ray film in a day. [7] The mean number of case in X-Ray examinations by radiologic technologists was 29.29 cases and make used of 56.87 sheets of X-Ray film in a day. Also, the average number of case was reading by radiologists was 32.42 case and 62.97 sheets of X-Ray film in a day.

• 한국응용곤충학회지
• /
• 제34권4호
• /
• pp.321-327
• /
• 1995

밀양에서 월동하는 애멸구 개체군의 월동생태에 관한 정확한 자료를 얻고자 본 연구를 수행하였다. 월동 애멸구의 영구성 비율은 12월상순에 4령충(약 60%)이 가장 많았으며, 다음은 3령충(약 30%), 5령충(약 6%), 2령충(약 3.4%), 성충 및 1령충 순서였다. 이러한 월동 애멸구의 영구성 비율과 순서는 채집시기에 따라 변화였으며, 그 결과 3월상순에는 5령충(47-50%)이 가장 많았고, 다음은 4령충(44-46%)이었으며, 4월상순에는 성충이 약 75-81%를 차지하였다. 월동 애멸구의 발육상황을 수치로 나타낸 평균령기는 월동기간동안 계속하여 증가하는 경향이었으며, 채집년도간 평균령기의 차이는 연도간 월동기간중의 온도차이에 따른 월동 애멸구 영구성 비율의 차이에 따른 결과였다. 애멸구의 체중도 월동기간동안 계속하여 증가하였다. 월동기간동안 애멸구으 채집밀도는 보리밭보다 휴반에서 월등하게 높았다. 월동기간동안 애멸구 약충기생봉에 의한 기생률은 평균 약 21%였다.