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김선근,서홍섭 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.2
자성 초미립자로 이루어진 응집체의 형상이 응집기구에 따라 어떤 영향을 받는가를 실험과 이론을 통하여 살피었다. 실험에서 입자가 크면 클수록, 물질 고유의 포화자화도가 크면 클수록 만들어진 응집체는 사슬모양을 이루었으며 이 사슬은 외부 자장하에서 거의 직선에 가까운 모습을 보였다. 또 사슬을 이루는 기본입자들의 크기는 극히 좁은 분포를 가지고 있음이 관찰되었다. 아울러 사슬형 이든 random한 것이든 어떤 형태의 응집체에 대해서도 그 형상을 fractal의 개념을 써서 수학적으로 표시할 수 있었다. 이론적으로는 무향성의 van der Waals힘, hydrodynamic 힘들과 방향성의 자기력을 각각 고려하여 그것이 브라운 응집에 기여하는 유효인자값을 계산하여 비교 검토하였다. 그 결과 사슬을 만드는 경우 다른 힘을 자기력이 압도하여 일어남을 확인하였고 더불어 외부 자장하의 선형화 및 기본입자의 분포에 관한 위의 실험적 사실도 충분히 뒷받침할 수 있었다. The shapes of aggregates of ferromagnetic ultrafine particles have been studied experimentally and theoretically. Experiment shows that the paricles form more chain-like aggregates when both the size and the saturation magnetization of the particles increase as far as their sizes remain within single domain. The chains become straightened under an external magnetic field. The primary particles in a single chain seem to have very narrow size distributions. The various shapes of the aggregates could be described mathematically by the concept of 'fractal'. The values of the efficiency factor which modifies the extent of Brownian coagulation were calculated from a model equation considering isotropic forces (van der Waals and hydrodynamic forces) and anisotropic force (magnetic force), respectively. It has turned out that the latter force dominates the formers in case of chain-forming particles and the model well supports the experimental observations on the chain linearization under the field and the monodispersity of the primary particles, described above.
金善根,鄭炳和,金珖,吉殷鎬,金文成,朴洪表 中央醫學社 1963 中央醫學 Vol.5 No.5
1. The author has studied on 115 operated cases of H.N.P. since reporting on the study of Sciatica and H.N.P. among Koreans in August 1956. 2. In these series, H.N.P. was found predominately in patients from the 2nd decade to the 3rd decade of life (66.3%). Males were involved much more frequently than females(84.8%). 3. The L 4ti5 interspace is most commonly involved in the spine level of H.N. P. , the per centage is 84%. 4. The operation used by the author was chiefly partial interlaminar diskectomy (75%). 5. The author classified macroscopically the pathology of the ruptured. disk as free disk, moderate degeneration and liquified disk. Moderate degeneration was mostly found. In surgery on the cases of free disk the, prognosis was good. 6. Revision was carried out on 7 recurrent cases, and 3 cases of these were contralateral recurrent H.N. P. , 2 cases were homolateral, and the others were hematoma with infection, bony impingement. The main complications in this authors series was neurosis and aneurysm. 8. The prognosis of the operated patients was divided into 4 groups. In these groups the per centage of completely healed cases (group 1. If )was 71.3%.
원격검침 시스템의 빅데이터를 활용한 공동주택 단지의 전기설비 최적설계 용량 산정에 관한 연구
김선근 한국조명.전기설비학회 2019 조명·전기설비학회논문지 Vol.33 No.4
In case of Korea, apartment housing accounts for a largest portion in whole residential type. For apartment construction, estimated capacity of whole apartment complex is conducted at an initial design stage. Especially, A capacity of electrical facilities of apartment complex is estimated by code and regulation. However, the electric equipment design plan tends to be designed considering the excess margin more than the actual electric equipment capacity used. In this study, electrical utilities consumption data of 5,881 residential households were collected for a year. This study shows real consumption of apartment complex is lower than current standard capacity. Thus, The proposed maximum demand power in this paper can reduce the construction cost of electrical equipment for apartments.
기축건물의 제로에너지 하우스 하자 사례를 통한 공종별 문제점 및 최적구축 방안에 관한 연구
김선근,권순욱,Kim, Sun-Geun,Kwon, Soon-Wook 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.4
In this paper existing buildings, not a new buildings and house for living people not just a displaying and a viewing, created by the imagine effect or virtual simulation was applied various Active and Passive elements. After constructing zero-energy houses, through default case happened during operation period it is described problems and solutions about field part, work classification, installation by Location part, and Installation equipment part. Since then, to take advantage of this thesis, it's the purpose of this paper using as the baseline data for building a zero-energy house in another similar case.