장력법을 적용한 박판블록의 변형제어에 관한 연구

김철호,양종수,김호경,Kim, Cheol-Ho,Yang, Jong-Soo,Kim, Ho-Kyung 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.6

The weld-induced deformation is more serious in thin plates than in thick plates because heat affect zone of thin plates is wider than that of thick plates and in addition internal and external constraints have much more influence upon weld-induced deformation of thin plates. This paper deals with the application of the mechanical tensioning method to butt weld of thin plates to reduce the transverse and longitudinal deformation. In order to investigate the quantitative effect of tensioning method upon the reduction of angular deformation and shrinkage in longitudinal and transverse direction of weld line, butt welding test has been carried out for several thin plate specimens with varying plate thickness and magnitude of tensile load. From the present experimental study, it has been found that the tensioning method is very effective in reducing the weld-induced residual stress as well as the weld-induced deformation.

유기질비료 시용이 무의 생육 및 수량에 미치는 영향에 관한 연구

김철호,윤화모,Kim, Cheol-Ho,Yun, Hwa-Mo 배재대학교 자연과학연구소 1992 自然科學論文集 Vol.5 No.1

유기질비료 시용이 봄 및 가을 작형에서 무 품종의 생육 및 수량에 미치는 영향을 알아보고자 본실험을 실시한 바 다음과 같은 결과를 얻었다. 1) 무의 엽장, 엽중, 근장, 근경, 근중등 생육은 봄, 가을작형 모두에서 3요소, 발효계분 + 1/5 량NK추비, 발효계분, 계분, 무처리구 순으로 촉진하는 경향이었으며, 엽의 chlorophyll 함량과 질소함량도 생육에서와 같은 처리순으로 증가하였다.2) 봄 및 가을작형의 수량에 있어 발효계분 450kg 처리구는 3요소구에 비해 저하되는 경향이었으나 전국평균 수량을 상회하였다.3) 발효계분처리로 4회연속재배한 경우보다 1회재배한 경우보다 3요소처리구와의 무 생육차가 감소하였다.4) 무 재배후 토양의 질소 및 마그네슘함량은 처리간 비슷한 경향이었으며 pH, 유기물함량과 인산 및 칼슘함량은 3요소구에 비해 발효계분에서 높은 경향이었다. The experiment was conducted to evaluate the effects of organic fertilizer. Sarang of fermented poultry manure. Miwon glutamic acid fertilizer and poultry manure, on the growth and yield of radish cultivated in spring and autumn. 1) The growth of leaf length, leaf weight, root length, root diameter and root weight of radish in two culture types was stimulated in order of NPK, fermented poultry manure + 1/5NK, fermented poultry manure, poultry manure and control treatment, and chlorophyll and nitrogen content of leaf were increased in order of the above mentioned fertilizers.2) Yield decreased in fermented poultry manure plot of 450kg application comparison with NPK plot but the one of 1800kg fermented poultry manure was increased. The yield of 450kg Sarang plot was sufficient as compared with Korean average yield of spring and autumn culture.3) The difference of growth of radish between treatments of fermented poultry manure and NPK was lowered by continuous application of Sarang organic fertilizer.4) Soil nitrogen content and exchangeable Mg were similar in all treatments but soil pH, the contents of organic matter, $P_2 O_5$ and Ca were high in the fermented poultry manure treatment.

하천의 어제, 오늘 그리고 내일 1 - 원주천의 역사와 문화

김철호,Kim, Cheol-Ho 한국하천협회 2013 하천과 문화 Vol.9 No.1

슬관절 퇴행성 관절염의 관절경적 치료 - 기졔적 증상이 있는 군과 없는 군과의 비교 -

김철호,임창균,조성우,김기형,문진웅,Kim Cheol-Ho,Lim Chang-Kyun,Cho Seong-Woo,Kim Gi-Hyung,Moon Jin-Woong 대한정형외과스포츠의학회 2003 대한정형외과스포츠의학회지 Vol.2 No.2

목적: 관절경 술식으로 치료한 퇴행성 슬관절염 환자에서 기계적 증상의 유무에 따른 임상 결과를 알아 보고자 하였다. 대상 및 방법: 2000년 10월부터 2002년 1월까지 슬관절의 퇴행성 관절염 으로 관절경 수술을 받은 60명 60례를 대상으로 하였다 추시 기간은 평균 15개월(12$\~$30개월)이었다. 수술전 단순 방사선 소견과 문진 그리고 이학적 검사로 기계적 증상의 유무를 판단 하였다. 치료 결과는 Baumgaertner의 평가 방법을 이용하였다. 결과: 술전 Baumgaertner score는 기계적 증상이 있는 군에서 평균 3.1점에서 술후 8.1점이었으며 기계적 증상이 없었던 군에서는 술전 3.5점에서 술후 5.4점으로 기계적 증상이 있었던 환자군에서 더 높은 만족도를 나타냈다. 결론: 퇴행성 관절염에서 기계적 증상이 있는 경우 관절경적 치료는 의미 있는 치료방법이라고 사료되나 보다 많은 증례에 대한 연구가 필요할 것으로 사료된다 Purpose: The purpose of this study is to evaluate the clinical results for the treatment of osteoarthritis of the knee by arthroscopic procedure according to presence or absence of mechanical symptoms. Materials and Methods: We studied sixty patients (60 knees) who underwent arthroscopic procedure for the treatment of osteoarthritis of the knee from October,2000 to January,2002. The average follow up period was 15 months(12-30 months). We evaluated the mechanical symptoms by simple radiographs, history taking and physical examination. We analysed the clinical results by Baumgaertner's scale. Results: The Baumgaetner's score improved from 3.1 preoperatively to 8.1 postoperatively in the group with mechanical symptoms, whereas the scores in the group without mechanical symptom improved from 3.5 preoperatively to 5.4 postoperatively. The patients with mechanical symptoms were satisfied more than the patients without mechanical symptoms. Conclusion: The arthroscopic surgery could be one of good alternative treatment methods for the osteoarthritis of the knee with mechanical symptoms . But, more than these patients will be needed for further evaluation.

저온에서 초전도 결정의 비열 점프

김철호,Kim, Cheol-Ho 한국결정성장학회 2011 한국결정성장학회지 Vol.21 No.1

본 논문에서는 먼저 저온에서의 초전도 결정의 비열 점프를 임계 온도의 함수로 구하였다. 다음에, 구한 비열 점프의 부호와 크기 등을 분석하여 여러 가지 실험적인 사실들을 예측하였다. 마지막으로 우리가 예측한 실험 사실과 실제의 실험이 일치하는지 비교하였다. 이론적으로 구한 비열점프는 $YNi_2B_2C$ 결정의 비열 점프 업 과 비열 점프 다운 현상을 비교적 잘 설명한다. 특히 매우 낮은 온도에서는 상전도-초전도 전이 시에 비열이 점프 다운된다는 주목할 만한 이론적 예측을 실험 결과를 통해 확인할 수 있었다. In this paper, firstly we have derived and presented the specific heat jump as a function of the critical temperature. Secondly, we have analyzed the sign and magnitude of the derived specific heat jump and predicted the expected experimental results. And lastly, we have compared the expected experimental results with the real experimental results. Theoretically derived specific heat jump is considerably compatible with the specific heat jump up and down phenomena of the $YNi_2B_2C$ crystal. Especially, the remarkable theoretical prediction-hat the specific heat would jump down during the normal state-to-superconducting state transition at extremely low temperatures-have been confirmed by the experimental results.

초전도 결정의 저온 비열 점프의 자기장 의존성

김철호,Kim, Cheol-Ho 한국재료학회 2011 한국재료학회지 Vol.21 No.2

Specific heat of a crystal is the sum of electronic specific heat, which is the specific heat of conduction electrons, and lattice specific heat, which is the specific heat of the lattice. Since properties such as crystal structure and Debye temperature do not change even in the superconducting state, the lattice specific heat may remain unchanged between the normal and the superconducting state. The difference of specific heat between the normal and superconducting state may be caused only by the electronic specific heat difference between the normal and superconducting states. Critical temperature, at which transition occurs, becomes lower than $T_{c0}$ under the influence of a magnetic field. It is well known that specific heat also changes abruptly at this critical temperature, but magnetic field dependence of jump of specific heat has not yet been developed theoretically. In this paper, specific heat jump of superconducting crystals at low temperature is derived as an explicit function of applied magnetic field H by using the thermodynamic relations of A. C. Rose-Innes and E. H. Rhoderick. The derived specific heat jump is compared with experimental data for superconducting crystals of $MgCNi_3$, $LiTi_2O_4$ and $Nd_{0.5}Ca_{0.5}MnO_3$. Our specific heat jump function well explains the jump up or down phenomena of superconducting crystals.

개에서의 indocyanine green 배설시험 및 혈장효소 활성치의 변화

김철호,최일관,손민수,김진구,강정부,Kim, Cheol-ho,Choi, Il-kwan,Son, Min-soo,Kim, Jin-gu,Kang, Chung-boo 대한수의학회 1992 大韓獸醫學會誌 Vol.32 No.4

This experiment was carried out to establish a proper method of indocyanine green(ICG) excretion test for a applicable liver function test in dogs. The half life(T1/2), fractional clearance rate(KICG) and retention rate after injection of ICG with or without administred carbon tetrachloride($CCl_4$) were also invested. The results obtained were as follows ; 1. The maximum absorbance of ICG in plasma was at 810nm. 2. Half life and fractional clearance rate when administered 0.25 and 0.50mg of ICG per Kilogram body weight were $6.33{\pm}0.58$ minutes and $0.11{\pm}0.99$/minute in the former, $10.01{\pm}1.0$ minutes and $0.07{\pm}0.007$/minute in the latter, respectively. The ICG removal rate was exponentially linear for the first 15 minutes after injection both, of 0.25 and 0.50mg of ICG. 3. One day following the administration of $0.0042m{\ell}\;CCl_4$ kilogram body weight which injected 0.50mg of ICG, half life was more longer and fractional clearance rate was significantly reduced than that of ICG single injection. 4. Plasma retention rate when 15, 30, 45 minutes after injection dose of 0.25 and 0.50mg ICG per Kilogram body weight, $14.7{\pm}4.8$, $5.1{\pm}3.1$, $2.6{\pm}1.6%$ in the former, $26.9{\pm}1.8$, $11.1{\pm}2.4$, $4.8{\pm}1.3%$ in the latter, respectively. However, after administration of $CCl_4$, plasma retention rate of ICG at a dose of 0.50mg, it was $39.3{\pm}0.9$, $16{\pm}2.9$, $10.7{\pm}0.1%$, respectively. 5. Plasma enzyme(AST, ALT, r-GTP) activities administered with $CCl_4$ were increased, but there was no change which injected any dose of single ICG injection. From these results, ICG excretion test to dog is applicable to evaluation of liver function in both clinical and research.

AOP 기술을 이용한 DEVS 기반 시뮬레이터의 적응성 향상 기법

김철호,Kim, Cheol-Ho 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.3

The DEVS formalism has the well-defined relationship between its model and simulator. However, it does not define the connection between its model and experimental frame needed when a simulator's implemented with it. So, in most DEVS based simulators, the modules of the two parts are tangled, so that changing and reusing them is not easy. This paper proposes a method to improve the changeability of the experimental frame and the reusability of the model by modularizing the two parts using the AOP technology. I applied the new method to a real project, and the result shows that it improves the two qualities effectively than before.

HYDRA 70 로케트 체계(상)-하늘과 땅의 용아(소공자)

김철호,Kim, Cheol-Ho 한국방위산업진흥회 1987 國防과 技術 Vol.- No.95

세나라 책방을 둘러보고 프랑크푸르트도서전을 다녀와서

김철호,Kim, Cheol-Ho 대한출판문화협회 1993 출판저널 Vol.138 No.-

우리가 '출판선진국'에게서 배울 건 책을 보는 그들의 관점과 태도이지 책을 만드는 기술과 방법은 아니다. 유럽의 어린이책 편집자들은 어린이를 어른과 똑같다고 생각하는 것 같다. 또한 어린이용 그림책에는 책마다 전력투구하는 작가의 예술혼이 있다. 영국.프랑스.독일의 책방을 보고 온 필자의 유럽아동물에 대한 인상기를 통해 우리 아동물출판 실태를 돌아본다.