白居易의「新樂府」考

김재승 韓國中國語文學會 1978 中國文學 Vol.5 No.-

독립모달공간 제어기법에서 작동기의 수 및 최적위치 선정

황재혁,백승호 한국 항공대학교 항공산업기술연구소 1994 航空宇宙産業技術硏究所 硏究誌 Vol.4 No.-

In this study, a new formulation of independent modal space control is developed to handle the attitude and vibration control problem for large flexible structures. The main advantage of this method is that one can obtain an analytical solution for the optimal control law for very large order systems. The fundamentaal limitation of previous works, the requirement of one actuator for each mode to be controlled, is relaxed in the new formulation. The closed-loop design is obtained while independently assuring stability and the design may be iterated to improve the closed-loop dynamic characteristics. The ease of control law generation by this method is seen to be obtained at the expense of the ability to adjust directly the penalties on the actuator efforts. Since actuator optimal placement is of fundamental importance, three methods which are simple to use for determination of optimal actuator locations have been suggested.

실제좌표 공간에서 선형 진동시스템의 해석기법

백승호,황재혁,박명호,이재홍 한국 항공대학교 항공산업기술연구소 1996 航空宇宙産業技術硏究所 硏究誌 Vol.6 No.-

The coefficients of a linear nonconservative system are arbitrary matrices lacking the usual properties of symmetry and definiteness. A method is developed herein for the efficient analysis of linear nonconservative systems. This constructive method utilizes equivalence transformations, and does not require conversion of the equations of motion to first-order forms.

마르크스主義論의 唯物辨證法 硏究

車在哲,金承鎬 漢陽大學校 人文科學大學 1984 人文論叢 Vol.8 No.-

The aim of this study is to criticize the materialist dialectic of Marxian philosophy by examining the essence and laws of dialectical materialism. So far, a number of critical studies in examining the materialist dialectic have been developed. Most of them are discussed on the laws of it. This study is consistent with a view point in which the materialist dialectic is products of Marxian methdology. However, based on the assumption that the materialist dialectic is a scientific laws of Marxian philosophy, this examining introduce more critical studies than examined in the prior studies. Judging on the basis of this critical frame, the materialist dialectic is not refer to a philosophy, but to the dogmatic ideologie. Therefore, the materialist dialectic has a dogmatic properties, particutarly in its methodology. A few dogmatic explanations examined in this paper might be presented in a summary from as followings. First, the materialist dialectic is based on Marxian ideologie, because the logics of it admitted dogmatic method. Secondly, the materialist dialectic is a philosophy of non-system, metaphysics. Without considering dogmatic methodology of Marxian philosophy, it is not easy to criticize the laws of materialist dialectic. Finally, it must be point out that the various explanation of ot were contradicted and were seen as the philosophy of poverty.

Nd₃Ba_(5)NiAl₃O_(15) 상의 합성과 Rietveld 법에 의한 결정구조 정밀화

변승현,신진현,이재열 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2

Nd₂O₃, BaCO₃, NiO, Al₂O₃를 출발물질로 하여 새로운 Nd₃Ba_(5)NiAl₃O_(15) 상을 고상반응법에 의하여 합성하였다. 반응 온도는1250 ℃로 하였고 열처리 중 반복적인 혼합을 실시하였다. Nd₃Ba_(5)NiAl₃O_(15) 상의 결정구조는 분말 X-선회절 법에 의한 데이터를 Rietveld 법을 이용하여 정밀화하였다. 출발 모델은 Nd_(3.43)Ba_(4.42)Co_(2.23)Al_(1.77)O_(15) 의 결정구조를 따랐고 공간군 P6₃mc(186), 격자상수 a = 11.5518(4)Å, c = 6.9706(3)Å. 최종 신뢰도 R 값은 R_(wp) = 0.19.2, R_(p)=0.150으로 나타났다. 이 상의 결정구조는 Ni^(Ⅵ)Al^(Ⅳ)₃O_(15)클러스터로 구성되어있고 이 클러스터는 Ni^(Ⅵ) 육면체가 3개의 Al^(Ⅳ) 사면체와 corner sharing 하는 형태를 보인다. The new Nd₃Ba_(5)NiAl₃O_(15) phase was synthesized with Nd₂O₃, BaCO₃, NiO and Al₂O₃ by solid state reaction at 1250 ℃ with intermittent grinding. The crystal structure of Nd₃Ba_(5)NiAl₃O_(15) has been refined on X-ray diffraction powder data by means of Rietveld method. The starting model was based on the Nd_(3.43)Ba_(4.42)Co_(2.23)Al_(1.77)O_(15) structure. The crystal system was hexagonal, space group P6₃mc(186), a = 11.5518(4)Å, c = 6.9706(3)Å. Final R values were R_(wp) = 0.19.2 and R_(p)=0.150 The structure consists of clusters of Ni^(Ⅵ)Al^(Ⅳ)₃O_(15) in which a Ni^(Ⅵ) octahedron shares corners with 3 Al^(Ⅳ) tetrahedra.

경북지방 겹집의 공간특성 비교연구

洪升在 圓光大學校 1995 論文集 Vol.29 No.2

경북지장 민가의 類型은 견집형 민가가 주류를 이루며, 그 겹집형 민가는 분포한 지역에 따라 평면구조 및 공간구성에 있어서 차이가 있다. 특히, 태백산맥을 경계로 내륙산간지방과 태백산맥 東斜面 및 海岸地域의 겹집형은 뚜렷한 차이를 보여준다. 이와 같은 東西간의 차이는 교통의 편리성에 따른 인접지역과의 문화적 접촉 및 지리적 환경에 따른 局地的 기후와 연관이 있다. 본 연구에서는 답사를 통하여 실측조사된 자료를 기본으로 평면 및 공간구조를 비교하여 각 지역의 局地的인 특성을 파악하고 또한 각 類型의 原型과 變化過程을 추정해 보았다. Most of Vernacular Hounses in Kyung-buk Province have been known to us that they belong to the plan type of Kyup-Jip style. But, the typical plan of Kyup-Jip style house shows various types based on it's geographical conditions. Especially, between the plan type of western and eastern parts of Tae-Baek Mountain range in Kyung-buk Province shows distinct differentae in the plan pattern and spatial organization. These distinctiveness are closely connected with unique climatic and geographic condition of that are as, and cultural contact with adjacent district. Therefore, this study tries to find out the architectural characteristics and archtypes of Kyup-Jip style houses in the two areas, the eastern and the western areas of Tae-Baek Mountine range. Futhermore this study elucidate the developmental aspect of the two plan types.

李朝時代 警察의 史的考察 : 李朝初에서 甲午更張以前까지의 制度史를 中心으로

林承宰 東國大學校 法政硏究所 1970 法政論叢 Vol.2 No.-

집진용 세라믹 필터의 제조 및 공기 투과 특성

이승인,박재구,정재화 한양대학교 환경공학연구소 2000 環境科學論文集 Vol.21 No.-

슬러리발포 및 겔캐스팅법을 이용하여 세라믹 다공체를 제조하였다. 또한, 이를 분진제거용 여과재로 응용하기 위해 기공구조 및 공기 투과율에 관한 연구를 실시하였다. 기공률은 80% 정도이며, 100㎛와 200㎛, 두 종류의 기공크기를 갖는 다공체를 제조하였다. 기공들은 창(window)을 통해 연결된 연속성 기공구조를 갖는다. 미세분진을 제거하기 위해, 다공체의 한쪽 면은 표면여과층을 형성하였으며, 기공크기는 10 ㎛이하이다. 기공크기가 200㎛인 다공성지지체의 경우, 900∼1000×10-13 ㎥의 투과율은 나타내었으며,기공크기가 100㎛인 지지체의 투과율은 600∼700 × 10-13 ㎥로 각각 측정되었다. 표면여과층이 형성된 여과재의 투과율은 약 200 × 10-13 ㎥로서 지지체의 기공크기에 관계없이 거의 일정한 값을 나타냈다. 또한, Flyash 분진을 이용하여 측정한 여과재의 집진효율은 99.9% 이상인 것으로 나타났다. This study was carried out to evaluate the pore structure and air permeability of the foam ceramic filter prepared by using foam method. Two different types of agents, Benzethonium chloride(C27H42NO2Cl) and Sodium Lauryl Sulfate(CH3(CH2)11OSO3Na) were used for foaming slurry. Porosity of foam ceramics was about 80 % and pore sizes were differed as 200 and 100 ㎛ respectively according to types of agents. It was observed that foam ceramics had continuous pore structure that pores were connected each other by small pathways called windows. For collecting dust, one side of foam ceramic support was coated with fine particles that the size was 20∼50 ㎛. Pore size of the coating layer was under 10 ㎛. Permeability of foam ceramics is proportional to pore size. But coated ceramic filters have similar values without regard to pore size of supports. The permeability of supports was varied with pore size in the range of 600 × 10-13 ㎥ to 1000 × 10-13 ㎥. And for the case of the coated ceramic filter, it was about 200 × 10-13 ㎥. As a result of dust collection test with fly ash, the particle removal efficiency for the oeramic filter specimen was estimated over the 99.9%.

셀룰라 이동 무선 네트워크 시스템에서 적응적인 채널 할당에 관한 연구

오승재 順天靑巖大學 1996 論文集-順天靑巖大學 Vol.20 No.2

We simulate high-capacity mobile radio systems using different channel assignment in irregular cellular systems. In this simulation, we initiate call attempts and move vehicle about randomly according to prescribed statistical distribution. After system operating Statistics are accumulated, base station and radio channels are assigned to serve mobile. Relationships between system parameters obtained from the simulation are presented. Performance of a dynamic channel assignment system has all channels available at all base station. In this paper, for irregular cellular distribution of call attempts and 40-channel systems with reuse intervals of four base station radio coverage areas, the dynamic channel outperforms the fixed one at blocking rates up to 40 percent..

담수지에서의 식물성 Plankton 군집의 계절적 변동에 관한 연구 : Study on Phytoplankton Population Dynamics in Two Reservoirs

현재선,양승원 서울대학교농과대학농업개발연구소 1989 서울대농학연구지 Vol.14 No.2

This study was carried out to examine the seasonal changes of abiotic factors and characteristics of phytoplanktonic community to investigate the probable casual relationship between them at two reservoirs near Suweon City during the period from August 1987 to July 1989. 1. Caracteristics of physical and chemical factors. 1-1. The water temperatures were higher at Ilweol reservior than at Uncheon reservoir throughout the year with exception January and February, 1988. 1-2. The dissolved oxygen concentrations (ppm) and its saturations were higher at Ilweol reservoir than Ucheon reservoir in spring and fall, but low in winter. 1-3. The average concentrations of NH₄-N (ppm) were about 2 times higher at Ilweol reservoir, than at Ucheon reservoir and 15 times at the winter peak. 1-4. The concentrations of PO₄-P (ppm) were so as NH₄-N, but its absolute concentrations and variation were lower than NH₄-N. 1-5. The values of pH were slightly higher at Ilweol reservoir than at Ucheon reservoir, low in winter and increased toward summer. 2. Characteristics of phytoplanktonic community. 2-1. The total species identified were 209 species in 84 genera; 149 species in 48 genera at Ilweol reservoir, and 182 species in 66 genera at Ucheon reservoir. Reservoir-specific species were 29 species in 18 genera at Ilweol reservoir, and 59 species in 36 genera at Ucheon reservoir. 2-2. The average densities of the phytoplankton were greater at Ilweol reservoir than at Ucheon reservoir, and so in vaiations. 2-3. In general, the dominant plankton groups were green algae for Ilweol reservoir and diatom for Ucheon reservoir during the study. 2-4. Dominance indicies were greater at Ilweol reservoir than at Ucheon reservoir. While species diversity indicies (Shannon, Evenness, Richness indicies) were greater at Ucheon reservoir than at Ilweol reservoir throughout the year. 2-5. Cyclotella meneghiniana seems to be the common dominant species throughout the year in two reservoirs. The seasonal dominant species showed considerable difference between the two reservoirs, reflecting the difference in the conditions of mineral nutrients at two reservoirs. The relationship between the dominant species and the two mineral nutrientswas examined and found significant for NH₄-N, indicating to be more important than PO₄-P. 2-6. The dominant plankton genera were Oscillatoria, Anabaena, Microcystis, Merismopedia (blue-green algae), Scenedesmus, Micractinium, Ankistodesmus, Golenkinia (green algae), and Cyclotella (diatom) for Ilweol reservoir, while Synedra, Fragilaria, Tabellaria (diatom), Staurastrum, Characium, Pleurotaenium, Astrococcus, Chlorella(green- algae), and Oscillatoria (blue-green algae) for Ucheon reservoir.