정지궤도 복합위성 개념 설계

김창호,김경원,김선원,임재혁,김성훈,Kim, Chang-Ho,Kim, Gyeong-Won,Kim, Seon-Won,Im, Jae-Hyeok,Kim, Seong-Hun 한국천문학회 2012 天文學會報 Vol.37 No.2

위성체가 발사체에 실려 발사될 때에 매우 높은 가속도에 의한 정적, 동적 하중 및 공기의 저항에 의한 하중, 연소 가스 분출시 발생하는 음향에 의한 하중, 발사체로부터 분리될 때 발생하는 충격 하중 등 여러 가지의 극심한 하중을 겪게 된다. 이러한 발사 환경에 대한 안정성을 검토하기 위해 발사체 업체에서 제공하는 매뉴얼 상의 설계 조건을 이용하여 설계하고 해석하여 검증한다. 천리안 위성의 후속 위성으로, 해상도 및 채널 성능 향상된 차세대 기상탑재체를 탑재하고 현재 개발 중인 정지궤도 복합위성에 대해 발사환경을 고려한 개념 설계 및 초기 해석을 수행하였고, 개발 가능성 분석을 그 목적으로 한다.

거대 정지궤도위성 형상 설계

김창호,김경원,김선원,임재혁,김성훈,Kim, Chang-Ho,Kim, Gyeong-Won,Kim, Seon-Won,Im, Jae-Hyeok,Kim, Seong-Hun 한국천문학회 2012 天文學會報 Vol.37 No.2

위성체가 발사체에 실려 발사될 때에 매우 높은 가속도에 의한 정적, 동적 하중 및 공기의 저항에 의한 하중, 연소 가스 분출시 발생하는 음향에 의한 하중, 발사체로부터 분리될 때 발생하는 충격 하중 등 여러 가지의 극심한 하중을 겪게 된다. 이러한 발사 환경에 대한 안정성을 검토하기 위해 발사체 업체에서 제공하는 매뉴얼 상의 설계 조건을 이용하여 설계하고 해석하여 검증한다. 천리안 위성의 후속 위성으로 해상도 및 채널 성능 향상된 차세대 기상탑재체를 탑재하는 정지궤도 복합위성을 개발 중이다. 임무 수명 기간을 연장할 수 있는 3.5톤급 혹은 그 이상의 플랫폼에 대한 형상 설계를 수행하였고 그 내용을 목적으로 한다.

에어리어 마케팅전략에 관한 사례연구 -(주)진로의 참이슬의 시장탈환-

김창호,Kim, Chang-Ho 한국정보기술전략혁신학회 2004 情報學硏究 Vol.7 No.4

The present paper attempts to describe Area Marketing and develop an empirical model for Alcoholic Company. The focus is given on the several area in Korea. With both empirical case studies ad literature review, we aim to develop empirical case and propose a desirable area marketing strategy for specific area Area Market Research was adopted for several Area as an environment analysis and the action plan about sales promotion that each area was developed. After It was implemented for 5 years(1999-2003). The Jiro made a results as follow: The first is sales volume. It was risen Market Share 55.3%(2004.11) more than 38%(1998). The second is Relationship with retailer(wholesaler) and CRM(customer relationship management effects: Loyal customer was increased). The last one is Brand Power which was extended than before.

방전액의 전도율이 와이어방전가공성에 미치는 영향

김창호,Kim, Chang-Ho 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.2

In wire-electrical discharge machining (W-EDM), the dielectric plays an important role as the working fluid. It affects the material removal rate and the properties of the machined surface. This paper deals with the effects of the electrical conductivity of dielectric and cobalt percentage of sintered carbides on the machining characteristics and the machined surface integrities with deionized water as dielectric. A series of experiments have been performed on sintered carbides having different cobalt contents. Experimental results show that a higher cobalt content of WC decreases the metal removal rate and worsens the surface quality. Lower electrical conductivity of the dielectric results in a higher metal removal rate as the gap between wire electrode and workpiece reduced. Especially, the surface integrities of rough-cut workpiece, wire electrode, and debris were analyzed also through scanning electron microscopy(SEM) and surface roughness tester. By energy dispersive spectrometry(EDS), it is confirmed that micro cracks and some of electrode material are found on the workpiece surface.

국제화 시대의 병원 외자관리 전략

김창호,Kim, Chang-Ho 대한병원협회 1994 대한병원협회지 Vol.23 No.7.8

선천성 코눈물관막힘을 가진 영아 중에서 마사지만으로 호전된 경우의 특징

김창호,유혜린,윤영수.Chang Ho Kim. M.D.. He-len Lew. M.D.. Young Soo Yun. M.D. 대한안과학회 2008 대한안과학회지 Vol.49 No.10

Purpose: The treatments for congenital nasolacrimal duct obstruction range from minimally invasive to more invasive methods. Initially, clinicians select lacrimal sac massage with topical antibiotics application or early lacrimal sac probing. We studied if the characteristics of infants improved after lacrimal sac massage with topical antibiotic application. Methods: Two hundred thirty-four eyes of 204 patients diagnosed with congenital nasolacrimal duct obstruction from March 2001 to January 2007 were included. Excluded were infants who had obvious epiblepharon or eyelid abnormalities, tumors of the lacrimal system, or a history of trauma. Neonates less than 1 month were also excluded to rule out neonatal conjunctivitis. At the first visit, we recorded birth profile information such as gestational age, birth weight and height, onset time of symptoms, and post-conceptional age. We compared the results between the successful treatment group and failure group after lacrimal sac massage and topical antibiotic application. Results: One hundred twenty-three eyes showed improvement after conservative treatment (52.6%), and the infants included in the success group visited earlier and had lower PCA (P<0.05). No other factors evaluated in this study contributed toward the improvement in symptoms observed. Conclusions: When considering treatment for congenital nasolacrimal duct obstruction, an evaluation of factors related to birth should be performed. According to the results, infants with the characteristics of favorable outcome should be treated conservatively, while those patients who do not have the characteristics for favorable outcome should be treated by early probing to achieve an effective and satisfactory outcome. J Korean Ophthalmol Soc 2008;49(10):1559-1564

(바이오기업 소개) 전문의약품 생산업체 이연제약 -발효 의약품 중심으로-

김창호,Kim, Chang-Ho 한국미생물학회 2004 微生物과 産業 Vol.30 No.1

치아 및 임플랜트 지지 고정성 국소의치에서 내가동 연결장치의 변형에 관한 유한요소법적 분석

김창호,최아영,계기성,조규종,Kim, Chang-Ho,Choi, Ah-Young,Kay, Kee-Sung,Cho, Kyu-Zong 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.2

A lot of the research paper was reported about the result of influence of IMC (Intra-mobile connector) in the IMZ implant placed solely in the alveolar bone, but reports about the effect of IMC on functional load at state of connecting with natural teeth ere rare. The major propose of this study was find the mechanical character of IMC itself by using the finite element analysis program after simulated variance of condition connected with the natural teeth and implant on funcional load. When first and second premolar was lost, IMZ implant was placed with a diameter of 3.3mm and a length of 13mm with IMC in second premolar area. Rigid connection was done and the non-figid connention was located on the female part of the canine abutment and the implant respectively and then both the infraocclusion of $30{\mu}m$ and the non-infraocclusion under the load of 40kg applied to the portion of the natural teeth, the pontic and the implant. The displacement and the stress of it was estimated and analyzed IMC itself of the rigid connection and the non-rigid connection was grouped. The following result were obtained. 1. In all groups, the displacement of Y-axis was greater than that of X-axis and the aspect of displacement showed that IMC was displaced downward and to the center. 2. There was no differences in the displacement of IMC regardless of the connection type. 3. In the displacement of IMC, I 4 was the least, I 1 and I 3 are similar and I 2 was the greatest. 4. There was no differences in the peak value of maximal stress of IMC regardless of the connection type. 5. In the peak value of maximal stress of IMC, I 4 was the least, I 1 and I 3 were similar, and I 2 was the largest.

인공산성우가 잣나무 및 쥐똥나무 유묘의 (幼苗) 엽내 엽록소 함량에 미치는 영향

김창호,정용문 ( Chang Ho Kim,Yong Moon Cheong ) 한국산림과학회 1987 한국산림과학회지 Vol.76 No.1

With the purpose of pursuing the increase and decrease of chlorophyll a and chlorophyll b caused by application of the simulated acid rain treatment on Pinus koraiensis seedlings and Ligustrum obtusifolium cuttings, the experimental design of randomized block arrangement with three replications was implemented in the experimental field of Yesan National Agricultural Junior College, during the growing season of 1985. Pinus koraiensis seeds stratified in cool and moist condition were sown on pots, and in case of Ligustrum obtusifolium, C1/1 cuttings were potted for experimental use in the early spring. The regime of artificial acid rain, based upon precipitation frequency and density, was simulated from the learning of climatological data averaged from 30 years records. The spray of acid water containing pH values of 4.0 and 2.0 was initiated from the 1st of May and ended on the 31st of August. As control, ground water was also treated at the same time. To analyse the chlorophyll content, those leaves looking representative and unaffected by other harmful agents were sampled on the 18th of September, and UV-visible spectrophotometer was used. With decrease in pH values of acid rain, the content of chlorophyll a and chlorophyll b decreased in both species. The decrease in chlorophyll a could be confirmed through statistical significance, but not in chlorophyll b. And when we discussed the chlorophyll decrease index which was explained in detail in the paper, an attention might be given to similarly decreasing values in both chlorophyll a and chlorophyll b, according as pH levels of acid rain decreased. The ratios of chlorophyll a to chlorophyll b in both species were not affected by different pH leaves of acid rain.

몇 발근환경인자가 주목삽수 (揷穗) 발근에 미치는 효과

김창호,남정칠 ( Chang Ho Kim,Jung Chil Nam ) 한국산림과학회 1985 한국산림과학회지 Vol.70 No.1

The purpose of this experiment lies in finding the most appropriate cutting condition of Taxus cuspidata Sieb. et Zucc. which has been considered valuable tree species in gardening. Statistical analysis was focused on the comparison of the average ratios of rooting beaween greenhouses and fields, based on the observation rooted autogenis. To conduct this survey, hardwood cutting of Taxus cuspidata Sieb. et Zucc. were performed at both places of experiment above on April 20, 1982 with rooting results calculated on October 31, 1982. After formation of cuttings, it was soaked in IBA 200 ppm for 12 hours and than put in a bed. A summary of the result is presented as follows; 1) Cutting at the greenhouse showed higher average rate of rooting than at fields. Same tendency was found regardless of the differences in treatment. 2) It was clear that IBA-treatment contributed remarkably to causing higher average rooting rate. As an evidence, when twenty centimeter cuttings were inserted sandy media, IBA-treated area resulted in eighty six percent of average rooting rate, as compared with only twenty three percent in nontreatment case. In case of field cutting, IBA-treatment brought about fifty three percent of rooting in comparison with eleven percent nontreatment. 3) When sandy soil, loam and brown soil were separately used as cutting media, the highest rooting rate was found in case of sandy soil, without any difference between the two experimental places above. 4) As a result of the analysis to seek the impact of the length of cuttings on rooting, the range of length form fifteen to twenty centimeter was apparently most appropriate. It was also found that the rate of rooting declined beyond twenty five centimeter. 5) Two kinds of rooting pattern were observed. One was the case that callus cell lump was created on the lower cut side of cuttings. Importantly, root radical were formed inside the lump to influence the germination of root system. The other relates to the case that adventitious root which look like lateral roots appeared at the stem region. In abstract, first, sandy soil was effectively recommended in case of hardwood cutting in April. Second, the most appropriate length of cuttings ranged between fifteen and twenty centimeters. Third, high density IBA treatment was clearly effective. Forth, for proper environmental management, both pre-disinfection of sail by sterilizer and maintenance of high relative humidity were essentially required.