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).

소비자패널자료를 통해 살펴본 비내구소비재의 상표선택행동에 있어 준거가격의 영향에 관한 기술적 연구

안광호(Kwang Ho Ahn),임병훈(Byung Hun Lim) 한국마케팅학회 2000 마케팅연구 Vol.15 No.2

본 연구의 목적은 국내 소비자들을 대상으로 수집된 패널자료를 이용하여 비내구소비재에 있어 소비자가 형성하는 준거가격이 상표선택행동에 미치는 효과를 살펴보는 데 있다. 실증분석결과 준거가격이 소비자의 상표선택행동에 의미있는 영향을 미치는 것으로 밝혀졌다. 준거가격이 상표선택에 미치는 효과를 알아보기 위해 로짓분석을 실시한 결과, 준거가격과 실제가격간의 차이가 상표선택에 유의한 영향을 미치는 것으로 나타났다. 즉 소비자가 형성한 준거가격에 비해 특정가격의 실제가격이 낮을수록 그 상표를 구매할 확률이 증가하는 것으로 나타났다. 또 프로스펙트이론을 통해 제시된 소비자의 가격에 대한 비대칭적 반응도 확인되었다.

DAF를 이용한 음식물쓰레기 바이오차의 탈염특성

안광호 ( Kwang-ho Ahn ),신동철 ( Dong-chul Shin ),정진홍 ( Jinhong Jung ),정윤아 ( Yoonah Jeong ),이예은 ( Ye-eun Lee ),김이태 ( I-tae Kim ) 한국폐기물자원순환학회 2022 한국폐기물자원순환학회 심포지움 Vol.2022 No.1

탈수여액을 이용한 활성슬러지의 저온 질산화 향상

안광호 ( Kwang Ho Ahn ),김광수 ( Kwang Soo Kim ),김이태 ( I Tae Kim ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.1

In a domestic waste water treatment plant(WWTP), the amount of recycle water from an anaerobic digestion tank or sludge thickener is approximately 1% to 3% of inflow rate. The water quality of recycle water is very favorable to dominant microorganism of nitrifying bacteria since nitrogen concentration is higher than organic matter concentration and also alkalinity is high. This study was performed to improve nitrification of activated sludge at low temperature. Lab-scale reactor was operated by introducing dewatering water increased the number of nitrifying bacteria. As a result, nitrification reactor become nitritation due to high NO2--N concentrations at HRT 12hr. Nitrification of activated sludge at 10℃ was further improved by injection of dewatering water compared to that of the aeration tank without injection of dewatering water. The best nitrification efficiency was 10% of the dewatering water supply.

고객자산 구성요소가 고객충성도에 미치는 상대적 효과에 관한 연구

안광호(Kwang Ho Ahn),김모란(Mo Ran Kim),김성환(Sung Hwan Kim) 한국마케팅학회 2011 마케팅연구 Vol.26 No.1

최근 신규고객의 획득보다는 기존고객의 유지 및 관계강화가 기업수익성을 창출하는데 주요원천이 됨에 따라 고객관계관리(CRM)의 중요성이 부각되었다. 이에 따라 고객관계에 기반을 두어 형성된 고객자산 (customer equity)에 관한 연구가 활발하게 이루어지고 있다. 고객자산의 구성요소는 가치자산(value equity), 브랜드자산(brand equity), 관계자산(relationship equity)로 구성되며, 이를 측정하기 위해 고객생애가치 (Customer Lifetime Value: CLV)를 사용하였다. 하지만 고객자산을 측정하기 위해 사용된 고객생애가치는 기업의 재무적 성과를 측정하는데 유용한 개념이지만, 기업들이 이를 정확히 측정하는데 어려움이 있다. 고객생애가치에 기반한 고객자산 측정은 고객의 누적 구매량과 구매액에 초점을 맞추고 있기 때문에 고객자산을 정의하는데 핵심요소인 장기적 고객관계 구축이라는 개념을 반영하지 못하는 한계점을 갖는다. 이에 따라 본 연구는 고객과의 장기적 관계형성이라는 고객자산의 핵심개념을 반영하기 위해 고객생애가치대신 고객충성도를 사용해 고객자산을 측정했다. 본 연구는 Rust, Zeithaml, and Lemom(2000)이 제안한 고객자산모델을 확장시킨 Vogel, Evanschitzky, and Ramaseshan(2008)의 연구를 바탕으로 고객자산의 구성요소들이 고객충성도에 미치는 효과를 살펴보았다. 또한 상황에 따라 고객자산 구성요소의 상대적 중요도가 달라질 수 있으므로, 고객자산의 구성요소와 충성도간의 관계에서 제품유형이 갖는 조절효과를 살펴보았다. 실증분석 결과 고객자산의 구성요소인 가치자산, 브랜드자산, 관계자산은 고객충성도에 긍정적인 영향을 미치는 것으로 나타났으며, 가치자산과 관계자산에 비해 브랜드자산이 고객의 기업/브랜드 충성도에 상대적으로 더 많은 영향을 미치는 것으로 나타났다. 고객자산의 구성요소들과 고객충성도간의 관계에서 제품유형이 갖는 조절효과를 살펴본 결과, 고관여/이성제품의 경우 가치자산과 브랜드 자산이 고객충성도에 유의하게 영향을 미치는 것으로 나타났으며, 고관여/감성제품의 경우에는 가치자산, 브랜드자산, 관계자산 모두 고객충성도에 긍정적인 영향을 미치는 것으로 나타났다. 저관여 이성/감성제품의 경우 가치자산, 브랜드자산, 관계자산 모두 고객충성도에 유의하게 영향을 미치는 것으로 나타났다. 연구결과를 요약하면, 고객들은 가치자산, 브랜드자산, 관계자산 모두를 고려해 기업 또는 제품에 대해 평가하고, 이를 기반으로 충성적 행동을 결정하는 것으로 나타났다. 또한 제품유형에 따라 고객자산의 구성요소의 상대적 영향력이 다르게 나타났는데, 이는 제한된 마케팅자원을 가진 기업들이 제품유형에 따라 고객자산 구성요소에 대한 마케팅투자의 비중을 차별화시켜야 함을 시사한다. As maintaining and growing existing customers become more profitable source than the acquisition of new customers, many firms recognize the strategic importance of CRM(Customer Relationship Management). The key of successful CRM is to measure, build, and strengthen the customer equity. The concept of customer equity is important in combining customer relationship/ retention management with brand management. In the saturated product market, customer equity as a measure of the future purchase behavior of a firm`s customers is a strategic intangible asset to be monitored and strengthened to maximize long-term marketing performance. With the growing recognition that customer equity is a key strategic asset, researches on linking marketing actions to the return on investment for marketing mix programs and customer equity have been gaining significance and several conceptual/quantitative models have been proposed. Our study consists of the qualitative and quantitative approach. The purpose of qualitative research is to examine whether three customer equity drivers(value equity, brand equity, and relationship equity) are useful and valid constructs in predicting the loyal customer behavior and how they have differential impact on the customer behavior according to product types. For this purpose we use ethnographic interview. Four informants are interviewed to implement the domain analysis, taxonomy analysis, componential analysis and draw the theme and meanings. We find that value equity, brand equity, and relationship equity are useful constructs in explaining the customer loyalty and have differential impact on the customer behavior according to different product types. Quantitative approach empirically investigates the effect of customer equity drivers on customer loyalty based on the study of Vogel, Evanschitzky, and Ramaseshan(2008) which had expanded the Rust, Zeithaml, and Lemon`s study(2000) on customers equity. Specifically we empirically examine whether the value equity, brand equity, and relationship equity that are customer equity drivers have differential impact on customer loyalty And this study hypothesizes that the relative impact of customer equity drivers would be different depending on product types and examines the moderating effect of product types in the causal relationship between the drivers of customer equity and customer loyalty as well. The products are categorized as four types that are high involvement-think product(notebook), low involvement-think product(apparels), high involvement-feel product(coffee store), low involvement-feel product(shampoo). we use stepwise multiple regression analysis to empirically test the causal relationship between value equity, brand equity, and relationship equity and customer loyalty. The empirical results support that value equity, brand equity, and relationship equity all have a positive impact on customer loyalty. Especially brand equity affects more strongly on company/brand loyalties than the other two drivers( value equity, and relationship equity) do. We examine the moderating effect of product type in the relationship between customer equity drivers and loyalty, In the case of high involvement-think product, only brand equity and value equity affect customer loyalty significantly. For high involvement-feel product, all of value equity, brand equity, and relationship equity affect customer loyalty positively and brand equity is especially crucial in building customer equity. In the case of low involvement think/feel product, all of value equity, brand equity, and relationship equity affect customer loyalty significantly. The customers seem to build loyalty based on the careful assessment of all drivers of customer equity such as value equity, brand equity, and relationship equity. In addition, their relative impact is different depending on the product types. Since a company can not maintain all customer equity drivers at high level with its limited marketing resou

OH<SUP>*</SUP>PLIF 이미지와의 비교에 의한 역변환된 OH<SUP>*</SUP> 자발광 이미지의 화염 구조 가시화 평가

안광호(Kwangho Ahn),송원준(Won Joon Song),차동진(Dong Jin Cha) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12

SNG 화염구조 가시화를 위한 OH<SUP>*</SUP> 자발광 이미지 역변환에서 전처리 효과

안광호(Kwang Ho Ahn),송원준(Won Joon Song),차동진(Dong Jin Cha) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11

온라인 개방코드 OSCILOS를 이용한 모델 부분 예혼합 가스터빈 연소기의 연소불안정 해석 사례

안광호(Kwang Ho Ahn),인병구(Byung Gu In),차동진(Dong Jin Cha) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12

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.