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편측 후방 치아 잔존시 의치 설계에 따른 지대치지지 조직과 잔존 치조제의 응력 분석에 관한 연구
안광호,정영완,진태호,Ahn, Kwang-Ho,Jung, Young-Wan,Jin, Tai-Ho 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.2
This study was peformed to investigate the distribution and magnitude of stress at supporting tissue of abutment teeth and residual ridge tissue with remaining unilateral posterior teeth. Four types of removable partial dentures that included clasp retained removable partial denture, attachment retained removable partial denture, telescopic removable partial denture, and swing-lock partial denture were designed, and strain gauge was used for stress analysis. Each prosthesis was subjected to simulated vertical and oblique load. The following conclusions were drawn from this study. 1. The clasp retained removable partial denture generally distributed simulated vertical force more evenly to the supporting structure. 2. The stress at buccal side of 1st premolar was the lowest in swing-lock partial denture and that was highest in attchment retained removable partial denture. The stress at lingual side of 1st premolar was the lowest in telescopic partial denture. 3. In clasp retained removable partial denture, stress was lower at load site and ridge crest at mid-line, but it was higher at 1st premolar area on vertical load. 4. In attachment removable partial denture, stresses at buccal side of 1st premolar. lingual side of 1st premolar on vertical load, and ridge crest at midline on oblique load were higher. 5. In telescopic removable partial denture, stress at lingual side of 1st premolar was the least in all removable partial dentures, but the stress at load site was higher. 6. In swing-lock removable partial denture, stress at buccal side of 1st premolar was the lowest, and stresses at load site and distal end of residual ridge crest were higher.
반복 장착 철거시 CLASP ARM의 길이가 유지력의 변화에 미치는 영향
안광호,동진근,진태호,Ahn, Kwang-Ho,Dong, Jin-Keun,Jin, Tai-Ho 대한치과보철학회 1991 대한치과보철학회지 Vol.29 No.1
This study was designed to investigate the influence of the clasp arm length on the change of retentive force with repeated placement or removal. The author measured the retentive force of Akers clasp and I-bar clasp in the depth of undercut 0.5mm, 0.25mm, respectively, varying the length of clasp arm, that is, 10mm, 14mm, 17mm in Akers clasp and 16mm, 18mm, 20mm in I-bar clasp. The retentive force was measured just before the placement of removal, after 100 times repeated placement or removal, after 300 times repeated placement or removal. The obtained results were as follows : 1. The shorter the clasp arm, the greater retention in Akers clasp and I-bar clasp(p<0.05). 2. There was decreased retentive force of Akers clasp and I-bar clasp after 300 times repeated placement or removal(p.<0.005). 3. The decreasing rate of retentive force in Akers clasp with 10mm was higher than that with 17mm, after 300 times repeated placement or removal, but there was no statistica difference(p>0.05).
베이지안 MDS 모형을 이용한 시장구조분석과 소비자 상표선택행동에 관한 연구
안광호(Kwang Ho Ahn),김영찬(Young Chan Kim) 한국마케팅학회 1999 마케팅연구 Vol.14 No.4
지금까지 이산적 상표선택행동자료에 근거하여 각 소비자의 상표선호도와 상표대안들의 경쟁적 포지션을 공간상에 표시하기 위한 계량모형들이 개발되어 왔다. 다양한 형태의 optimal scaling, correspondence analysis, 벡터 MDS모형, unfolding MDS 모형, latent structure MDS모형등이 그 대표적인 예이다. 그러나 대부분의 모형들이 상표대안들 및 소비자들간에 독립적이라는 IIA가정을 가지고 있어 실제 상표선택행동에서 발생되는 상표대안들간의 의존성, 맥락효과 등을 모형속에 적절히 반영하지 못하고 있다. 본 논문은 이산적 상표선택자료에 대한 공간분석을 위해 베이지안 external 벡터 MDS모형을 제시한다. 모형의 모수를 추정하기 위해 Gibbs sampling방법이 사용된다. 또한 공분산행렬의 추정을 통해 상표 대안들간의 의존성을 밝힘으로써 IIA가정이 위반되는 실제 상표선택 상황을 반영할 수 있다. 이와 함께 본 논문에서 제안된 모형에서는 각 소비자의 상표선택에서의 불확실성을 사후표준오차의 추정을 통해 파악한다. 끝으로 본 논문은 청량음료 상표선택자료를 이용하여 제안된 모형이 적용되는 예를 보여준다.
SNG 선회 안정화 화염구조 가시화를 위한 OH<SUP>*</SUP> 자발광 이미지 역변환에서 전처리 효과
안광호(Kwang Ho Ahn),송원준(Won Joon Song),차동진(Dong Jin Cha) 한국연소학회 2015 한국연소학회지 Vol.20 No.1
Flame structure, which contains a useful information for studying combustion instability of the flame, is often quantitatively visualized with PLIF (planar laser-induced fluorescence) and/or chemiluminescence images. The latter, a line-integral of a flame property, needs to be preprocessed before being inverted, mainly due to its inherent noise and the axisymmetry assumption of the inversion. A preprocessing scheme utilizing multidivision of ROI (region of interest) of the chemiluminescence image is proposed. Its feasibility has been tested with OH PLIF and OH<SUP>*</SUP> chemiluminescence images of SNG (synthetic natural gas) swirl-stabilized flames taken from a model gas turbine combustor. It turns out that the multi-division technique outperforms two conventional ones: those are, one without preprocessing and the other with uni-division preprocessing, reconstructing the SNG flame structure much better than its two counterparts, when compared with the corresponding OH PLIF images. It is also found that the Canny edge detection algorithm used for detecting edges in the multi-division method works better than the Sobel algorithm does.