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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).
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.
안광호(Kwangho Ahn),안재환(Jaehwan Ahn),김이태(I Tae Kim),김석구(Seog Ku Kim),강성원(Sungwon Kang),박은주(Eunzoo Park),이영섭(Youngsup Lee) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.12
유체 내에서 발생된 음파 또는 초음파가 반사벽에 의해 반대방향으로 진행하면서 일정한 파동을 형성하는 음파를 음 향정재파(acoustic standing wave)라고 한다. 본 연구에서는 주파수 1.0 MHz와 2.0 MHz의 음향정재파 발생모듈을 설치한 연 속식의 입자분리장치에서, 유입수의 층류(laminar flow)를 고려하여, 수리학적체류시간(HRT) 변화에 따른 입자분리 특성을 살펴보았다. 정재파 가동에 다른 입자분리장치 내의 수온은 1.3~2.8℃ 정도 증가하였으나 정재파 형성에 큰 영향을 주지 않 았다. 주파수 1.0 MHz 가동 시 HRT 1시간에서 2시간, 4시간으로 길어짐에 따라 입자분리 효율(탁도)은 각각 64.1%, 70.0%, 74.3%로, 2.0 MHz에는 HRT에 따라 각각 58.0%, 61.8%, 70.7%로 증가된 것으로 나타났다. 즉, 동일한 주파수일 경우 HRT에 따라 처리효율이 10% 이상 차이가 발생하고 있으며, 1.0 MHz 주파수에서는 2시간, 2.0 MHz에서는 4시간 정도에서 70% 이 상의 처리효율을 유지할 수 있다. 주파수 1.0 MHz와 2.0 MHz를 동시에 가동한 결과, HRT 1시간, 2시간, 4시간에서의 입자 분리 효율은 각각 63.8%, 70.6%, 77.6% 나타나 연속된 정재파의 발생 보다는 HRT가 입자분리에 많은 영향을 주는 것을 알 수 있었다. Fluid generated within the sonic or ultrasonic waves are reflected by the wall, while the opposite direction forming a predetermined sound wave to the acoustic standing wave is referred to. In this study, the frequency of 1.0 MHz and 2.0 MHz acoustic standing wave generation module is installed in a continuous particle separation device, the laminar flow of influent, taking into account the hydraulic retention time (HRT) in accordance with changes in particle separation characteristics investigated. Operation of a standing wave in the particle separation device about 1.3~2.8℃ temperature is increased, but did not significantly affect the formation of standing waves. During operation, the HRT 1 hr frequency 1.0 MHz 2 hr, 4 hr longer as the particle separation efficiency (turbidity) were 64.1%, 70.0%, 74.3% and, 2.0 MHz has 58.0%, respectively, depending on HRT, 61.8%, 70.7% in the respectively. That is, the same frequency, the HRT treatment efficiency is 10% or more, depending on differences in generation and, 1.0 MHz frequency, 2 hr, 2.0 MHz 4 hr at about 70% or more of the processing efficiency can be maintained. Frequency of 1.0 MHz and 2.0 MHz operation at the same time, as a result, HRT 1 hr, 2 hr, 4 hr particle separation efficiency of 63.8%, respectively, 70.6%, 77.6%, rather than the generation of standing waves appear continuous HRT is affecting a lot of particles to separate could know.
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.
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.