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.

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.

벤처기업 블루오션 디자인에서 찾다

김철호,Kim, Cheol-Ho 벤처기업협회 2005 벤처다이제스트 Vol.82 No.-

한국 동해안에 출현하는 냉수괴의 특성과 기원

김철호,김구,Kim, Cheol Ho,Kim, Kuh 한국해양학회 1983 韓國海洋學會誌 Vol.18 No.1

To serch the origin of the cold water mass along the east coast of Korea its characteristics are inrestigated based upon Cooperative Study of Kuroahio and Fisheries Research and Development Agency data. In the southwestern part of the Japan Sea the North Korean Cold Water sinks at the front and flows southwards on top of the Japan Sea Proper Water. it is found that the sunken North Korean Cold Water il high in the content of dissolved oxygen and less saline compared with the Japan Sea Proper Water. It is highly likely that the cold water mass off the Jugbyeon-Chuksan coast in summer il the North Koreah Cold Water and not upwelled Japan Sea Proper Water. It os shown that the Notth Korean cold Water Flows strongly in summer and its scuthern limit is generally off Chuksan-Janggigab and occasionally off Gampo as observed in 1973.

세균에 의한 남조 Anabaena cylindrica의 분해에 대한 연구

김철호,권오섭,이진애,Kim, Cheol-Ho,Gwon, O-Seop,Lee, Jin-Ae 한국조류학회(藻類) 2003 ALGAE Vol.18 No.4

A Gram (-), rod-shaped bacterium in size of 1.6-2.8 $\times$ 0.4 μm was isolated from a eutrophic reservoir, which exhibited growth-inhibiting effect against a bluegreen alga (Anabaena cylindrica). This isolate showed positive reactions for catalase and oxidase, and optimal conditions of 35-40°C and pH 9.0. This isolate was designated AC-1 in this manuscript. In a mixed-culture of A. cylindrica and AC-1, their growth patterns were inversely correlated and the bluegreen algal vegetative cells completely disappeared within 24-36 hours. AC-1 showed similar lytic activity in natural water as in an artificial medium. The lytic activity of AC-1 was dependent on the photosynthetic activity of A. cylindrica. When observed under phase contrast microscope, the isolate lysed vegetative cells of A. cylindrica in scattered state in a liquid medium, whereas heterocysts have not been lysed.

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

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.

HYDRA 70 로케트 체계(하)-하늘과 땅의 용아(소공자)

김철호,Kim, Cheol-Ho 한국방위산업진흥회 1987 國防과 技術 Vol.- No.96

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

저온에서 초전도 결정의 비열 점프

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

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.