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農家所得增大를 위한 土地利用改善에 關한 調査硏究 : -中間地帶를 中心으로-
金文植,朱奉圭 서울大學校 農科大學 1977 서울대농학연구지 Vol.2 No.2
A study on land utilization characteristics has been made chiefly on general description of farming scale, type of farming, land productivity and cropping patterns and so on. However, a study on land utilization related to family labor earnings and economic land rent has not been undertaken. From this point, attempt was made on comparative study between family labor earnings and economic land rent on land utilization. In short, the comparative research result between family labor earnings and economic land rent on land utilization can be summarized as follows. 1) A final goal on land utilization in semi-plain crop region depend upon family labor earning than economic land rent. This means that land utilization is related to subsistence rather than commercial type. 2) There are the differential economic returns by crops. This means that the differential economic returns by crops depend upon the adequate or non-adequate crop choice based on same soil fertility condition. Therefore, it is very important subject on crop choice. 3) As size of farm increase, economic land rent per tanbo is higher than family labor earnings per tanbo. This means that the larger size of farm was adopted in farm machinery. 4) In comparing with family labor earning and economic land rent between single cropping system and double cropping system. However, family labor earnings on double cropping system is higher than single cropping system. 5) It appears thar a larger proportion of semi-plain crop fields is allocated for food crop and single cropping systems, while a smaller proportion of semi-plain crop field is utilized for cash crop and double cropping system. To suggest the further research on land utilization characteristics technical coefficient should be studied and over-all allocation models related to land resource allocation should be developed near future.
添加酸化物이 Ni-Zn Ferrite의 電氣 및 磁氣的 性質에 미치는 影響
朴奉斗,南寶植 慶北大學校 産業開發硏究所 1982 硏究報告 Vol.10 No.-
The variation of electromagnetic properties on Ni-Zn ferrite with additive oxides (As_2O_3, Bi_2O_3, and SnO) was measured with Hysteresis Loop Tracer at this sintering temperature range of 1150℃∼1350℃. The experimental results indicate that specific resistances were 0.3×10 exp (5)-2.8×10 exp (5)Ω ㎝, and the maximum initial permeability μ_i was 210 H/m, the maximum permeability μ_m 2450^* H/m, the maximum residual magnetization Br 900 gauss, and the minimum coercive force Hc 0.35 Oe. The loss coefficient shows that the additive oxides have Low value (1.3×10 exp (-4), at 2.5 MHZ) compared with the non-additives calcinated at 1250℃.
에틸렌디아민 四酢酸과 4,4'-디아미노비페닐의 縮合重合
金鳳植 嶺南大學校附設 基礎科學硏究所 1985 基礎科學硏究 Vol.5 No.-
Poly(2, 6-piperazinedione) was obtained by condensation polymerization of ethylenediaminetetraacetic acid with 4,4'-diaminobiphenyl. The yields of polymers from polymerization were than 83% and the melting points of polymers were in the range of 250 to 280℃. The polymer obtained from equimolar ratio of monomers at higher temperature was more thermostable than that at lower.
朴奉奎,金潤植 梨花女子大學校 韓國生活科學硏究院 1976 韓國生活科學硏究院 論叢 Vol.17 No.-
全南 務安郡의 松林이 솔잎혹파리에 依한 과거의 被害가 점차로 回復되어가는지 또는 그렇지 않은지에 관한 연구결과는 아직 밝혀지지 않은 상태이다. 그러나 현재 忠南의 서천군은 가장 피해가 심하고, 全北의 고창군은 그 피해가 中間정도이며, 全南 무안군은 그 피해가 회복되어 가는 것같이 外觀上으로는 나타나고 있다. 本調査는 赤松林과 黑松林을 對象으로 各地域마다 조사를 실시했다. 3개 조사지역의 정도는 삼림식생, 임상식생 및 환경구배의 類型에 뚜렷한 차이가 있어 다음 몇가지의 요인에 대한 정밀조사연구가 필요하다고 사료된다. 1) 個體占有面積과 密度 2) 落葉堆의 두께, 식피율, 토양水分含量, 토양 유기물함량, 상대습도 및 個體當의 總基底面積 3) 地理的인 方位, 참나무類의 占有度 및 出現頻度 The writer has investigated conditions of damage wrought by the needle midges, The codiplosis japonensis, upon the pine forests in Chun-nam and Choong-nam and Choong-nam Provinces, Korea. It os evident that degrees of the damage vary according to the following situations: 1) Individual occupied area and density of the forest. 2) Depth of litter, vegetational coverage, soil moisture, humus, and reltice humidity. 3) Total basal area per trees. 4) Geographical direction.
김귀식,이봉길 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.1
This paper reports the wear characteristics of two types of coating materials, which are Cr_(2)0_(3) and Zr0_(2), coated plasma thermal spray method. The wear test was carried out under air, grease, and bearing fluid conditions. The wear testing machine of a pin-on disk type were used to measure friction coefficients and the weight losses of the coating specimens on the various sliding velocity and loading condition. The wear surface of specimens were observed by scanning electron microscope (SEM) photographs.
김봉식,조성일,방효원,엄대용,이상돈 중앙대학교 의과대학 의과학연구소 1986 中央醫大誌 Vol.11 No.1
In order to investigate the regional eiectrophysiological characteristics of the rabbit SA node, the node was tied with fine silk threads into small preparations(0.5XO.5mm in size) and electrotonic connection between them was insulated. The preparations were divided into three groups, as peripheral, transitional and central areas. Three glass microelectrodes were inserted into the cells in each area and the data were collected when transmembrane potentials of each area was recorded simultaneously. 1. As the Na^+ concentration of the solution was reduced to 80, 60, and 40% of control, the beating frequency, the maximum diastolic potential(MDP), overshoot and the maximum upstroke velocity(Vmax) were decreased. The decrease of the beating frequency was more marked in the central area, and the spontaneous beating was arrested by the reduction of Na^+ concentration more than 60%. 2. In the peripheral area, MDP was decreased as the 2mM K^+ concentration reduced to 1 mM. At high K^+ concentration(12mM), the spontaneous beating of the central area was stopped in the 50% of preparations. 3. The decrease of the spontaenous beating frequency, due to Ach(Acetylcholine) was more prominent in the central area. The increase of the MDP was marked in the central area, however, the decrease of overshoot was distinct in the peripheral area. 4. The peripheral area was the most sensitive to TTX(Tetrodotoxin). The effects of epinephrine which changed the parameters of the action potential were more marked in the central area, but the effects were more marked in the peripheral area when the preparations were pre-treated with TTX. 5. The amplitude of the Na^+-K^+ pump activity of the peripheral area was larger and decreased in the transitional and the central area in sequence. The electrophysiological characteristics of the SA nodal cells have shown various differences by the locations. Especially, the central area which considered as the leading pacemaker are generally more sensitive to the various interventions.
홍봉식 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.1
The concentration profiles of boron-diffused layers in N-type silicon have been obtained using a steep-etching and sheet resistivity measurement method. About the boron distributions, those show that 1) they do not obey the predicted complementary error-function when the concentration is more than 10^19/㎤, 2) the surface concentration is a constant up to about the half of the depth of resultant junction, 3) the depth of resultant junction is linearly proportional to the sqare root of diffusion time, 4) the boron-diffusion coefficient is 3.21×10 exp^13㎠/sec at 1,000℃.