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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.
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.
충동구매에 미치는 마케팅자극요인: TV홈쇼핑 이용자를 중심으로
김창호,Kim, Chang-Ho 한국정보기술전략혁신학회 2005 情報學硏究 Vol.8 No.4
The central purpose of this paper is to examine impulsive buying from home shopping channels and to investigate some stimulating factors of marketing on the customers' impulsive buying. on TV. Survey questionnaires were given to 303 customers who have purchased products through TV home shopping more than once. We report the following findings. First, we find that product stimuli factors exert an effect on impulsive buying of fashion goods, but not of specialty goods. Second, of the two promotion stimuli factors a bonus pack and an extended payment period-the latter is shown to have a great effect. Third, in the case of price stimuli factors, concrete stimuli such as a discount range have a greater influence than abstract stimuli such as a reliable pricing. Finally, in the area of situational stimuli factors, speeches of show hosts have a bigger impact than buying situations such as limit selling. We believe that the current research provides a significant result, theoretically and practically, with respect to customers' behavior in TV home shopping. The methodological limitation involving samples and sampling method and the regional limitation make it difficult to generalize the findings. It should be worthy classifying and managing marketing stimuli. More practical research is in order.
온라인 구전정보와 수신자 특성이 구전수용에 미치는 영향
김창호,Kim, Chang-Ho 한국정보기술전략혁신학회 2005 情報學硏究 Vol.8 No.3
The present paper aims to examine the relationship between the online word of mouth(WOM) contents and the WOM effect and to see how receivers' features such as product knowledge and involvement level influence the WOM received. For that purpose, we categorize WOM contents into two subcategories; product news and personal experience. The WOM effect, in turn, is into the WOM received. Survey questionnaires were given to 268 collegians as to their online WOM activities to purchase MP3 players. SPSS 10.0 package was employed as the method of statistical analysis. We report the following results. First, product news is shown to exert a greater effect on the WOM received than personal experience. Second, their product knowledge plays a moderating role in the relationship between the WOM contents and the WOM received. Finally, it is shown that the factor of involvement level moderates the relationship between the WOM contents and the WOM received. The current paper attempts to develop a hypothetical relationship between WOM information and WOM received and to provide a theoretical foundation for the practical online marketing. We must admit the methodological limitations with respect to subjects and samples. It should be worthwhile, however, to compare online and off-line marketing and to expand the range of research in the current line of thought.
하악 2급 이개부 병변 치료시 비흡수성 차폐막과 혈소판 농축 혈장의 임상적 효과에 대한 비교 연구
김창호,임성빈,정진형,홍기석,Kim, Chang-Ho,Lim, Sung-Bin,Chung, Chin-Hyung,Hong, Ki-Seok 대한치주과학회 2004 Journal of Periodontal & Implant Science Vol.34 No.3
This study was performed to compare the clinical effectiveness of two regenerative techniques for class II furcation involvements in human: a combination of bone grafts with PRP vs. GTR with bone grafts. The e-PTFE group was treated with non-absorbable membrane and bone grafts, the PRP group was treated with PRP and bone grafts Pocket depth, clinical attachment level, and gingival recession were measured at baseline and postoperative 6 months. Vertical and horizontal furcation depth were measured by re-entry surgeries at 6 months post-treatment Both groups were statistically analyzed by Wilcoxon signed Ranks Test & Mann-whitney Test using SPSS program (5% significance level). The results were as follows: 1. The change of pocket depth, clinical attachment level, vertical furcation depth and horizontal furcation depth in both groups was decreased significantly at 6 months than at baseline. (p<0.05) 2. The change of gingival recession in both groups was increased significantly at 6 months than at baseline. (p<0.05) 3. The change of alveolar crest absorption in both groups was increased at 6 months than at baseline but there were no statistically significant differences. 4. The change of pocket depth, clinical attachment level, vertical furcation depth and horizontal furcation depth in both groups was increased significantly at 6 months, but there were no statistically or clinically significant differences with both groups. 5. The change of gingival recession and alveolar crest absorption in both groups was increased at 6 months, but there were no statistically or clinically significant differences with both groups. In conclusion, the use of bone graft with PRP or GTR technique improved clinical index of the soft and hard tissue in mandibular class II furcation involvement but there were no statistically or clinically significant differences between bone graft with PRP and GTR technique.
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.
실시간 영상 부호화를 위한 H.264/AVC의 비트율 제어 하드웨어 설계
김창호,류광기,Kim, Changho,Ryoo, Kwangki 대한전자공학회 2012 전자공학회논문지 Vol.50 No.8
In this paper, the hardware design of rate control for real-time video encoded is proposed. In the proposed method, a quadratic rate distortion model with high-computational complexity is not used when quantization parameter values are being decided. Instead, for low-computational complexity, average complexity weight values of frames are used to calculate QP. For high speed and low computational prediction, the MAD is predicted based on the coded basic unit, using spacial and temporal correlation in sequences. The rate control is designed with the hardware for fast QP decision. In the proposed method, a quadratic rate distortion model with high-computational complexity is not used when quantization parameter values are being decided. Instead, for low-computational complexity, average complexity weight values of frames are used to calculate QP. In addition, the rate control is designed with the hardware for fast QP decision. The execution cycle and gate count of the proposed architecture were reduced about 65% and 85% respectively compared with those of previous architecture. The proposed RC was implemented using Verilog HDL and synthesized with UMC $0.18{\mu}m$ standard cell library. The synthesis result shows that the gate count of the architecture is about 19.1k with 108MHz clock frequency. 본 논문에서는 실시간 동영상 부호화를 위한 효과적인 비트율 제어 방법을 제안하고 하드웨어로 구현한다. 제안하는 비트율 제어는 각 기본유닛 마다 R-D 파라미터 갱신에 의해 많은 연산 처리를 필요로 하는 이차원 R-D 모델을 사용하지 않고, 프레임의 평균 복잡도 가중치를 이용한 Qstep 결정 모델을 사용함으로써 연산량을 감소시킨다. 또한 적은 연산량과 빠른 MAD 예측을 위해 부호화된 기본유닛을 기반으로 영상의 공간적 및 시간적 상관관계를 이용하여 MAD를 예측한다. 제안하는 비트율 제어는 프레임 레벨 MAD 예측과 매크로블록 레벨 MAD 예측, GOP 비트 할당, 프레임 비트 할당, 가상버퍼, Qstep 결정 모델, 비트율 제어 파라미터 갱신, QP 결정 모듈을 포함하며 총 8개의 모듈로 구성된다. 비트율 제어 하드웨어는 Verilog-HDL을 이용하여 설계하였으며, Synopsys사의 Design Compiler를 이용하여 UMC 공정 $0.18{\mu}m$ 셀 라이브러리로 합성한 결과, 최대 동작 주파수는 108 MHz이고, 게이트 수는 19.1k이다. 실험 결과로부터 제안한 구조는 기존 구조 보다 게이트 수가 85% 감소하였고, 매크로블럭 당 QP를 결정하는데 평균 220 사이클 수가 소요되어 기존 구조보다 64% 단축됨을 확인하였다.
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.