지리산 면양목장 조성에 관한 연구 : Ⅰ보. 면양목장 조성 및 면양사육 단지화 조성을 위한 기초조사 Ⅰ. Fundamental Survey of Resources for the Development of Sheep Range and Sheep Farm Grouping

정현승,강봉태 진주산업대학교 1970 論文集 Vol.4 No.-

This survey reports the availability of the various resources such as geography, meteology, traffic condition, soil property, labor resource, pasture distribution and water resource, for the development of sheep range and sheep-farm group, on the first step to the three-year plan in an area around the Forestry Experiment Station of Chinju Agricultural and Forestry Junior Teachnical College in Mt. Chiri. 1. The geographical conditions of the region found to be fit for the establishment of sheep range were as follows; longitude:127˚44'east,latitude:35˚22'north,elevation:600-900m above marine surface level, slope:5-25˚, total area: 280 ha, and administrative district: from high level flats to Yeo-gok and Dusuk village, Yupyung-ri, Samjang-myun, Sanchungkun, Kyung Sang Nam Do, Korea. Especially, eighty seven farm households and Karangip primary school distriduted around this region were found to be the reasonable resources for the development of sheep farm group in this region. 2. The soil of the area was composed of most of sand-loam with PH 5.3∼5.8, 2-5% of grit and 13.3% of humus (4.6-19.3%) among 30∼50㎝ depth of surface soil. These fertile soil properties were found to be fit for the development of pasture. 3. The meteological records of this region were found as follows: frosty period: from October 16 to April 22, yearly mean air temperature: 9.2℃ , ranging from 26.6℃ in August to (-)12 in January, annual rainfall: 2,346mm, yearly mean wind velocity: 6.2m/sec, direction of the wind: north-west in winter and south-east in summer. According to the above results from only one-year observation, the meteological conditions of this region were similar to those of Dae-Kwan Ryung area and were estimated to be favorable for sheep raising. 4. In this region 35 species of wild grasses were prosperous. The green yield of the grasses averaged 1,584㎏ per 10a and 0.87a was required for grazing a sheep. Therefore, it was estimated that about 3,000 heads of sheep would be well raised in this region. The fact that about 30 percent of Mt. Chiri area is available for sheep pasture suggested that 400,000㎏ of wool, or 250,000,000 won in price(equivalent to 1/10 of the total wool imported in 1967)could be gained from grazing about 100,000 heads of sheep in the whole area of Mt. Chiri, 54,000 ha. 5. Sufficient water resources, conclusive of mooring by the farmers around this region, irrigation water, underground water and especially the pond situated in high level flats were found to be available and the quality of water was satisfactory for watering sheep. 6. Concerning the traffic situation of this region, the construction of 1.5㎞ of road to Dusuk village (with 200m of bridge) and three 2㎞ range path from Dusuk village were required. However, such traffic problems are not serious because the sheep farming requires the road only for disposal of wool produced once a year. 7. From the managment survey for 87 farms around this area, it was found that each farm had 1,019.6 hours of unemployed labour per year, which was sufficient for raising 60 heads of sheep. So it could be estimated. that potential labour enough for raising 5,200 heads of sheep was reserved in this area. Moreover, the Karangip primary school boys are available as a good resource of labour for sheep grazing. The great deal of by-products of sericulture and potato-farming, which were the major industries in this region, was available for sheep raising.

智異山 면양목장 조성에 관한 연구 : Ⅷ報. 智異山 山野草가 緬羊의 繁殖率에 미치는 영향과 羊毛의 加工利用方法, 販路方案, 貯藏法 및 緬羊團地造成時의 經濟性 分析 Ⅷ. Effect of the native herbages in Mt. Chiri on the breeding percentage of sheep and the processing method, way of marketing and storage of wool and economical analysis in the collective feeding of sheep

鄭鉉丞,姜奉泰,李炳五 진주산업대학교 1972 論文集 Vol.9 No.-

This is the report for 1971 of the third year project among the three years plan on the development of sheep range in Mt. Chiri. To investigate the effect of native grasses in Mt. Chiri on the breeding percentage of sheep this experiment was carried out from March 22, 1971 to March 21, 1972. Numbers of experimental animal used in this experiment were 12. Furthermore, the processing method of wool, marketing, economical analysis in the collective feeding and storage were investigated in cooperation with this experiment. The results obtained here were as follows; 1. For the processing method of wool, there are two ways; one of the processing method of wool is the self-processing method which follows the easy method of wool processing and another of the processing method of wool exchange with the good of wool texture company which follows the charge processing method of wool. 2. For the marketing route of wool, because the wool texture company can buy limitlessly wool, there are two ways to sell wool. The one of the way is the direct sell method of wool to the wool texture company and the other of the way is the sell method of wool via the route of circulation mechanism. 3. In the case of economical analysis for the collective feeding of sheep, if farms could raise 3,000 of sheep in the method of collective feeding it could get net income of 150,000 to 300,000 won for 52 days per farm per year. 4. For the storage of wool, to attach of wool fat must be needed and in the case of short period storage, wool must be placed in the arid place and in the case of long period storage, wool should be prevented from the attack of insect and rat, attachment of spurious article such as dust, decrease of weight and denaturation of wool fat. 5. The breeding percentage of sheep fed only native herbages plant was 60%.

암모니움, 아초산염과 칼슘 화합물이 고추 역병균(Phytophthora capsici)의 발아와 균사생장에 미치는 효과

장태현, 정봉구 忠北大學校 遺傳工學硏究所 1988 遺傳工學硏究 Vol.2 No.1

본문참고

흰쥐 편도체에서 칼슘결합단백인 calbindin-D28K함유 신경세포의 생후 발달에 관한 면역조직학적 연구

정윤영,김종중,문정석,박영란,정상봉,김현곤,박상수 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.1

Background and Objectives : The calcium-binding protein, calbindin-D28K(CB) is widely distribution of CB in rat amygdala during postnatal maturation, in order to provide an insight into the developmental role it may play in the amygdaloid neurons. Materials and Methods : The present study is based on 28 postnatal cases ranging from the day of birth, postnatal day 0 (P0) to 30 days (P5, P10, P15, P20, P30), and these cases were compared with adult rat amygdala. Cryostat sections processed free-floating with monoclonal antibody by immunohistochemistry. Results : CB-immunoreactive neurons were already found at birth in all amygdaloid nuclei except the intercalated nucleus. The intensity and number of immunoreactivity of CB-containing neurons increased during the first 10 days of postnatal life but dramatically decreased at P15. Mature patterns of CB-immunoreactive neurons were achieved at P20. In the adult amygdala, CB-immunoreactive neurons were distributed in almost all amygdaloid nuclei except the intercalated nucleus. Conclusion : The present results show early appearance of CB immunoreactivity in the amygdala. It may be related to the early appearance of CB immunoreactivity in many other brain regions, and suggests that CB may play a functional role during the development of the nervous system including amygdala.

實科 敎育 課程 詳細化 硏究

鄭聖鳳,宋賢順 韓國實科敎育硏究學會 1996 實科敎育硏究 Vol.2 No.1

교육과정 상세화는 교수의 질을 향상 시키고 교수 내용을 다양화 시키며, 교수 목표 실현을 위해 필요하다. 이 연구의 목적은 초등학교에서 실과 교육과정을 효과적으로 활용하는데 있다. 이 연구는 크게 세부분으로 이루어져 있다. 실과 교육 목적의 상세화, 실과 교육과정의 단원설정, 실과 교육고정 상세화의 실제가 그것이며, 또한 5, 6학년 실과 교육과정 상세화를 부록에 제시하였다. The curriculum specification be needed to promote the instructional quality, to diversify the teaching contents and to be realized the instruction objectives on practical art education. The purpose of this study was to specified the practical art curriculum for the practical use in elementary school. This study was contained three parts: the specification of practical art curriculum, the contents and units establishment of practical art curriculum, practical specification of practical art curriculum. Also, the specifications of practical art curriculum on 5th and 6th grades were presented in appenices.

AC PDP 네 투명 유전층의 절연내력과 투과율에 관한 연구

박정후,이성현,손재봉,김규섭,조정수 釜山大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.54 No.-

AC PDP(plasma display panel)는 40인치 이상의 대화면 디스플레이 장치로서, AC PDP내 투명 유전층은 방전플라즈마중의 양이온 충격에 의해서 금속전극이 스파터되는 것을 보호하고, 유전층 표면에 벽전하를 형성하여 대화면 구동에 필요한 메모리기능을 부가하므로 방전 cell구조에서 필수적인 부분이다. 이러한 유전층은 우수한 절연내력을 가져야할 뿐 아니라 가시광을 투과시키기 위한 높은 투과율이 요구된다. 따라서 본 연구에서는 여러 조건들 하에서 유전층의 절연내력과 투과율에 관하여 논하였다. 그 결과 15μm 두께를 가지고 570℃에서 소성을 행한 유전층의 경우 최소 29V/μm의 절연 내력을 가졌고, 80%정도의 투과율을 나타내었다. 그러므로 AC PDP에서 적정유전층의 두께는 최고인 가전압에 대해서 약 80V 정도의 마진을 가지는 15μm정도가 적당하다고 생각된다. AC PDP(plasma display panel) is large display panel over 40 inch. The transparent dielectric layers in AC PDP are essential to the discharge cell structure, because they protect metal electrodes from sputtering by positive ion bombarding in discharge plasma and form a sheath of wall charges which are essential to memory function necessary to drive large panel. This layer should have high dielectric strength, and also be transparent because visiable light must pass through this layer. Therefore in this paper, we discussed the dielectric strength and transmittance coefficient of the dielectric layer under various conditions. As a result, on the 15μm thickness, the minimum dielectric strength was 29V/μm and the transmittance coefficient was about 80% after 570℃ firing process. It is considered that the resonable dielectric thickness in AC PDP is 15μm because it has about 80V margin on the maximum applied voltage.

초등학생의 기술적 문제해결 과정에 대한 사례연구

송현순,정성봉 韓國實科敎育硏究學會 2000 實科敎育硏究 Vol.6 No.2

The purpose of this study was to investigate the problem solving process of elementary students as they attempted to find a solution about a technological problem. The students participating in this study were three fifth-grade students from an elementary school in Cheong-lu city. Technological problem solving task was used. They were provided with design brief which they designed and made a technological solution. The subiects were thinking aloud during their problem solving work. The natural talks and acts of the subiects were videotaped for subsequent analysis. Action were coded as using coding scheme an empirically derived grounded in 7heoretical models. Results showed as followed; Process exhibited in each of the case studies was not the same as that described in published models for the design or problem-solving process. And subject's problem-solving process was different. Subiects who developed their ideas using three-dimensional modelling acts were successfully problem solving than the others who didn't using it. They spent many times in generating ideas step. The act of modelling stimulated the generation of their ideas, the specify their ideas, and the evaluation possible ideas.

노화가 인체 중간엽 줄기세포로부터 조골세포로의 증식 및 분화에 미치는 영향

백기현,태현정,오기원,이원영,조정기,권순용,강무일,차봉연,이광우,손호영,강성구,김춘추 대한내분비학회 2003 Endocrinology and metabolism Vol.18 No.3

연구배경: 일반적으로 골다공증과 연관된 위험인자로는 연령, 폐경, 약물, 불충분한 칼슘섭취, 만성질환 및 운동부족 등이 있는데, 특히 노화가 진행할수록 골밀도가 감소하는 것은 잘 알려져 있다. 노화와 관련하여 진행되는 골소실은 조골세포 및 전구조골세포의 기능적 결핍에 의한 골형성의 감소가 주요한 요인으로 여겨지고 있다. 그 동안 연령이 조골모 세포의 양과 조골모 세포로부터 성숙조골세포로의 분화 및 증식에 미치는 영향에 대한 일부 보고들이 있었으나 아직 일치된 견해는 없는 형편이다. 방법: 다양한 연령의 사람으로부터 골수를 채취, 중간엽 줄기세포가 포함된 단핵세포를 분리한 후 조골세포로 분화하기 좋은 조건하에서 배양하였다. 대상군은다시 젊은군과 노령군으로 구분하여 다양한 변수를 비교 분석하였다. 일차배양에서는 CFU-F를 계수하여 골수내 중간엽 줄기세포의 수를 추산하였고, 칼슘측정을 통하여 기질의 무기화 정도를 비교하였다. 계대배양후 이차배양에서는 시기별로 알카리성 포스파타제 활성도를 측정하고 오스테오칼신 mRNA의 발현을 관찰하여 젊은군과 노령군 사이의 증식능 차이를 비교하였다. 또한 이차배양 시기별로 MTT 측정을 하여 양군간에 증식능 차이가 있는지 알아보았다. 결과: 1. 일차배양 15일째에 평균 CFU-F의 수는 젊은군에서 유의하게 많았다(젊은군 148.3±28.9, 노령군 54.3±9.1, p=0.02). CFU-F의 평균면적은 젊은군에서 넓은 경향을 보였으나 통계적으로 유의하지는 않았다. 2. 일차배양 17일 경과 후 양군간에 기질 칼슘 침착정도는 유의한 차이를 보이지 않았다(젊은군 103.6±50.6, 노령군: 114.0±56.5, p=NS). 3. 이차배양 10일째에 젊은군에서 알카리성 포스파타제 활성도가 고령군에 비해 유의하게 높았다(젊은군: 935.5±115.0 U/mg, 노령군: 578.4±115.7U/mg,p.0.05). 고령군에서는 시간 경과에 따른 변화가 미약했으며 전반적으로 알카리성 포스파타제의 활성도가 젊은군에 비해 낮았다. 4. 이차배양도중 오스테오칼신 mRNA의 발현은 배양시기별로 젊은군에 비해 고령군에서 더 낮은 경향을 관찰할 수 있었다. 5. 이차배양 10일과 15일에 젊은군에서 노령군보다세포증식이 유의하게 증가된 양상을 보였다(10앓 젊은군 0.73±0.05, 노령군 0.58±0.04, p=0.05, 15일; 젊은군 0.80±0.05, 노령군 0.70±0.03, p=0.05).결론: 이상의 연구에서 저자들은 노령군에서 젊은군보다 골수 내 중간엽줄기세포의 수가 적고, 노령군에서 유래한 전구조골세포의 성숙조골세포로의 증식 및 분화가 젊은군 보다 감소해 있는 것을 관찰할 수 있었다. Background: Osteoblasts originate from osteoprogenitor cells in bone marrow stroma, termed mesenchymal stem cells (MSCs) or bone marrow stromal cells. Each MSC forms colonies (colony forming units-fibroblasts [CFL-Fs]) when cultured ex vivo. There are some reports about the age-related changes of the number and osteogenic potential of osteoprogenitor cells, but any relationship has not been clearly established in humans. In this study, we counted MSCs using CFU-Fs count and examined the proliferative capacity and differentiation potential of osteoprogenitor cells. Finally, we analyzed how these parameters varied with donor age. Methods: Bone marrow was obtained from the iliac crest of young (n=6, 27.2±8.6 years old) and old (n= 10, 57.4k6.7 years old) healthy donors. Mononuclear cells, including MSCs, were isolated and cultured in osteogenic medium. In primary culture, we compared the colony-forming efficiency of MSCs between the two groups and determined the matrix calcification. When primary culture showed near confluence, the cells were subcultured. Alkaline phosphatase activity, osteocalcin expression by RT-PCR and proliferative potential by MTT assay were examined by the time course of secondary culture. Results: At the 15th day of primary culture, the mean number of CFU-Fs was significantly higher in the younger donors (young: 148.3±28.9, old: 54.3±9.1, p=0.02) and the mean size of CFL-Fs was also larger in the younger donors than the older donors. However, matrix calcification was not different between the two groups (young: 103.6±50.6, old: 114.0±56.5, p=NS). In secondary culture, alkaline phosphatase activities were significantly lower in the older donors. The younger donors showed peak alkaline phosphatase activity at day 10, while the older donors didn't showed a remarkable peak (young: 935.5±115.OU/mg, old: 578.4±115.7U/mg, p<0.05). Total cell number as a proliferative index increased progressively during the secondary culture and a significantly greater cell number was noted in the younger donors. Osteocalcin expression was generally upregulated in the younger donors, but this was not statistically significant. Conclusion: Our study shows that the number of osteoprogenitor cells is decreased during aging and that the proliferative capacity and differentiation potential of osteoprogenitor cells seem to be reduced during aging (J Kor SOC Endocrinol 18:296-305, 2003).

실리콘의 TMAH 식각을 사용한 Suspended-type 마이크로 가스센서의 제조

김현호,이상문,임준우,강봉휘,정완영,이덕동 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

In recent years, different types of microfabricated 'suspended-type' structure have been used as freestanding membranes for a variety of micro gas sensors. We examined the silicon etching characteristics of tetramethyl ammonium hydroxide(TMAH). A suspended type micro gas sensor with platinum heater, sensing electrode and temperature sensor using TMAH etching of silicon was fabricated on silicon nitride(1,500Å)/ silicon dioxide (3,000Å)/ silicon nitride(1,500Å) dielectric membrane. It has low thermal conductivity and balanced stress with silicon substrate for the purpose of improving the thermal isolation between heater and silicon substrate. To avoid any chemical or physical damages to gas sensing material during the photolithography or shadow mask process, the tin dioxide film was deposited onto whole surface of device by using maskless electron beam(e-beam) evaporation technology. The power consumption of the fabricated device was about 40mW at the operating temperature of 250°C. In case of adding Pt(2wt.%) or Pd(2wt.%) catalyst, the sensitivity to CO was higher and the sensitivity to C_(4)H_(10) was higher than those to other gases, respectively.

PSC 교량의 보강공법에 대한 실험적 연구

김현호,김기봉,정인근,송재필 中央大學校 建設環境硏究所 2002 環境科學硏究 Vol.13 No.2

많은 수의 국도상의 교량이 교통량 증가 및 차량의 대형화에 따라 내하력 증가의 필요성이 시급히 제기되고 있다. 본 연구에서는 국도상 교량 중 대다수를 차지하고 있는 프리스트레스트 콘크리트(Prestressed Concrete, PSC) 교량에 대해 유리섬유 부착 공법과 외부 후긴장 보강 공법을 적용하여 내구성 및 내하력의 증가방안을 확인하고자 한다. 실험체는 표준도면의 1/5 축소모델로서 지간길이 6m이며 총 15개의 실험체를 제작하여 정적 및 피로실험을 수행하였다. 실험 결과, 유리섬유 및 외부 후긴장 보강 방법을 적용하였을 때 균열하중 및 파괴하중의 크기가 증가되었고, 처짐의 감소효과와 균열에 대한 억제 능력이 증가하였다. 그리고 보강 실험체가 피로파괴 반복회수도 증가하며 유리섬유 보강 실험체의 경우 외부 후긴장 실험체보다 피로성능이 더 우수한 것으로 나타났다. 본 연구 결과를 통해 적용된 보강 기법이 노후된 PCS 교량의 성능증가와 수명 연장의 효과가 큰 것을 확인하였다. Most of the bridges on national road are needed capacity-enhancement, because of the increase of heavy traffic loads and aging of bridges. Among those bridges, prestressed concrete(PSC) bridges take a large portion. But there are not many related researches about strengthening PSC bridges. In this study, the practicability of strengthening methods for PSC beam were studied by the static and fatigue experimental method. For the experiment, 1/5 scale and six meters long PSC beams were made with concrete slabs. Glass fiber sheeting and external post-tensioning methods were used for strengthening PSC beams. Total 15 beams were made for static test and fatigue test. As a result, the strengthening methods, which used in this study, are efficient at increasing cracking load and failure load, to decrease deflection and prevent cracks. The experimental results show that the failure cycle of strengthened members are increased compare to non-strengthened members. The members strengthened with glass fiber show better enhancement in fatigue problem than the members strengthened with external post-tensioning method. With these experimental results, it can be said that the strengthening methods used in this study are efficient at extending the life time of aged PSC bridges.