• 한국식품위생안전성학회지
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• 제11권3호
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• pp.197-201
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• 1996

D10 values obtained for radiation alone in Bacillus subtilis and Clostridium perfrigenes were 0.35-0.48 kGy in vegetative cells, and 2~2.08 kGy in spores, respectively. Irradiation dose of 24 kGy completely inhibited spores. In the case of heat treatment, D50, 60 values ranged from 10 to 14 minutes in vegetative cells, and D70, 80, 90 values ranged from 10 to 140 minutes in spores. In the case of combined treatment with heat and radiation, D10 values ranged form 1 to 1.25 kGy in vegetative cells, and from 3.42 to 3.61 kGy in spores. Thus, resistance of cells to gamma radiation did not seem to be influences by pre-heating.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제39권4호
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• pp.168-174
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• 2013

Objectives: The aim of this study is to investigate the correlation between 2-dimensional (2D) cephalometric measurement and 3-dimensional (3D) cone beam computed tomography (CBCT) measurement, and to evaluate the availability of 3D analysis for asymmetry patients. Materials and Methods: A total of Twenty-seven patients were evaluated for facial asymmetry by photograph and cephalometric radiograph, and CBCT. The 14 measurements values were evaluated and those for 2D and 3D were compared. The patients were classified into two groups. Patients in group 1 were evaluated for symmetry in the middle 1/3 of the face and asymmetry in the lower 1/3 of the face, and those in group 2 for asymmetry of both the middle and lower 1/3 of the face. Results: In group 1, significant differences were observed in nine values out of 14 values. Values included three from anteroposterior cephalometric radiograph measurement values (cant and both body height) and six from lateral cephalometric radiographs (both ramus length, both lateral ramal inclination, and both gonial angles). In group 2, comparison between 2D and 3D showed significant difference in 10 factors. Values included four from anteroposterior cephalometric radiograph measurement values (both maxillary height, both body height) and six from lateral cephalometric radiographs (both ramus length, both lateral ramal inclination, and both gonial angles). Conclusion: Information from 2D analysis was inaccurate in several measurements. Therefore, in asymmetry patients, 3D analysis is useful in diagnosis of asymmetry.

• 한국멀티미디어학회논문지
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• 제16권9호
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• pp.1109-1118
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• 2013

최근 들어 S3D 콘텐츠가 광범위하게 대중화되고 있다. 하지만, 일부의 사람들은 3D 정보를 정확하게 인지하지 못하고 있다. 기존의 입체시 검사 도구는 입체의 인지 여부를 판단하는 테스트만 수행하고, 피험자가 인지하는 정확한 깊이 정보를 측정할 수 없다. 따라서 정확하게 측정할 수 있는 검사도구가 필요하다. 본 논문에서는 3D 콘텐츠 깊이 측정기 및 측정기에 적합한 3D 콘텐츠를 제작하고, 3D 오브젝트의 양안시차(disparity)에 대한 피험자가 인지하는 3D 오브젝트의 돌출거리를 측정하고, 이론값(예측값)과 측정값을 비교 및 관계를 분석하였다. 그 결과 측정값은 이론값보다 약간 크게 나타났으며, 돌출거리가 클수록 편차가 크게 나타났다.

• 한국식품영양과학회지
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• 제25권5호
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• pp.804-809
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• 1996

식품위생 관련 미생물 8종에 대한 방사선 단독 및 가열처리와의 병용처리에 의한 살균효과를 조사한 결과, 방사선 단독처리시는 공시균주들의 D$_{10}$ 값은 0.14~0.48 kGy로 나타났으며 그 중 Escherichia coli가 0.14 kGy로 감수성이 가장 높았다. 불활성화 계수는 2~3 kGy 조사시 4.54~21.43으로 나타났다. 가열 단독 처리시에는 D(min) 값이 $50\pm1^{\circ}C에서$ 는 10~40분, $60\pm1^{\circ}C에서는$ 5~15분 정도로 나타났다. 가열과 방사선과의 병용처리시는 D$_{10}$ 값이 0.04~0.31 kGy의 범위로 나타났고 불활성화 계수도 2~3 kGy 조사시 에는 6.45~75로 나타났다. 이상의 결과, 가열과 방사선의 병용처리는 균주들의 방사선 감수성을 현저하게 상승시킴을 알 수 있었다.있었다.

• Journal of the Optical Society of Korea
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• 제17권2호
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• pp.219-223
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• 2013

The purpose of this study was to determine the relationship between the spherical equivalent visual acuity (VA) and uncorrected astigmatism. On 108 emmetropic eyes, the spherical equivalent VA was measured for cross cylindrical lens (CC lens)-induced astigmatic eyes and the VA-astigmatism relation determined. On 158 astigmatic eyes, the spherical equivalent VA and corrected astigmatism were measured and the measured values were compared with the calculated values from the VA-astigmatism relation by correlation coefficient analysis. Subsequent to that, the relationship between spherical equivalent VA and uncorrected astigmatism was made. The relationship was fitted for an exponential equation. Correlation coefficient between calculated values by equation and measured values for astigmatic eyes was 0.991 (p<0.01). The relationship between the spherical equivalent VA and the uncorrected astigmatism was decided as follows (spherical equivalent VA / uncorrected astigmatism): 1.0 / 0.25 D, 0.9 / 0.50 D, 0.8 / 0.75 D, 0.7 / 1.00 D, 0.6 / 1.25 D, 0.5 / 1.50 D, 0.4 / 2.00 D, 0.3 / 2.50 D, 0.2 / 3.00 D, 0.1 / 4.00 D, and 0.05 / 4.75 D. In conclusion, the relationship table devised from this study is a useful reference for predicting uncorrected astigmatism by measurement of decimal VA in spherical equivalent.

• 한국임상수의학회지
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• 제15권1호
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• pp.162-170
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• 1998

Present experiments were undertaken in order to determine the normal hematological and blood chemical values of elks raised in Korea. Blood samples were collected from 22 healthy adult (5~10 years old) male elks raised in Kyung-pook prefecture and examined for 9 hematological and 15 blood chemical parameters using automatic blood cell counter and automatic blood chemical analyzer. The mean hematological values were determined as PCV : 34.23%, RBC count : $6.70{\times}10^{6}/{\mu}l, Hb : 12.15g/61, WBC count : 3.17{\times}10^{3}/{\mu}l$, neutrophil : 54.09%, eosinophil : 12.27%, Iymphocyte : 28.86%, monocyte : 5.23%, and platelet : $39.94$\times$10^{5}/{\mu}l$

• 한국균학회지
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• 제34권1호
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• pp.34-38
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• 2006

양성자 빔 조사 후 조사선량에 따른 느타리버섯(Pleurotus ostreatus) 담자포자 발아율 및 균사체 생존율이 $10{\sim}100\;Gy$조사선량에서 시그모이드 곡선을 그리며 증가하였으며, 이후 500y 이상 조사시 유의성있게 감소하였다. 50% 치사율($L_{50}$)을 나타내는 조사선량은 담자포자가 500 Gy, 균사체가 400 Gy로 나타났으며, $D_{10}$값($D_{10}\;=\;-l/slope(b)$, y = a + bx) 은 각각 750 Gy와 1,250 Gy로 나타났다. 느타리버섯 돌연변이원으로서 양성자 빔 이용시 적정 조사선량은 담자포자의 경우 $500{\sim}750\;Gy$, 균사체의 경우 $400{\sim}1,000\;Gy$가 바람직하다고 판단되었다.

• Restorative Dentistry and Endodontics
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• 제49권3호
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• pp.30.1-30.12
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• 2024

Objectives: The aim of the current study was to evaluate the effect of polishing systems and surface sealant on the color stability and whiteness index of single-shade resin composites after staining and bleaching. Materials and Methods: Three single-shade (Omnichroma, Charisma Diamond One, Zenchroma) and one multi-shade (Filtek Z250) materials were tested. From each resin composite, 40 specimens were prepared. The specimens were divided into 4 subgroups (n = 10) according to the surface treatments: 1-step polishing, 1-step + Biscover LV, 2-step polishing, and 2-step polishing + Biscover LV. Color differences (ΔE₀₀) were calculated after being immersed in the coffee solution for 12 days. After the staining, the specimens were immersed in a whitening mouthrinse (Crest-3D White) for 12 hours. Whiteness index differences (ΔWI_D = WI_D after staining - WI_D after bleaching) values were recorded. The generalized linear model was used for analysis (p< 0.05). Results: The lowest and highest ΔE₀₀ values were found for Zenchroma and Charisma Diamond One respectively. Sealed groups indicated higher ΔE₀₀ values than nonsealed groups with significant differences (p = 0.008). The lowest and highest ΔWI_D values were found for Zenchroma and Charisma Diamond One respectively. Sealed groups indicated lower ΔWI_D values than nonsealed groups with significant differences (p = 0.022). Conclusions: The use of surface sealant increased the discoloration and showed less whiteness change in resin materials. When the 1-step was compared with the 2-step polishing, the effects on the color stability and whiteness index values of the resin materials were similar.

• 한국항행학회논문지
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• 제4권2호
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• pp.182-190
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• 2000

본 논문은 HAPS와 이동위성 시스템과의 간섭영향 분석으로서, HAPS 고도가 20km와 50km일 때의 C/I 값을 구해 간섭 보호비를 초과하는 시간율 및 초과지속시간에 대한 평가를 행하였다. 그 결과 HAPS가 Iridium 시스템에 미치는 간섭의 경우 최저 C/I 값은 HAPS 고도가 50km일 때 20.42dB, 20km일 때는 12.73dB로 낮아지고, 이와 반대인 Iridium 시스템이 HAPS에 미치는 간섭의 경우도 각각 13.94dB에서 10.42dB로 낮아짐을 알 수 있었다. HAPS 고도에 따른 간섭영향을 보면, 고도가 낮아질수록 강한 간섭을 주거나 받게 되며, C/I 최저값 또한 HAPS 고도에 따라 다른 시점에서 나타난다.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2000년도 종합학술발표회 논문집 Vol.10 No.1
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• pp.34-38
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• 2000

본 논문은 HAPS와 이동위성 시스템과의 간섭영향 분석을 HAPS 고도가 20Km와 50Km 일 때의 C/I 값을 구해 간섭 보호비를 초과하는 시간율 및 초과지속시간에 대한 평가에 대한 평가를 행하였다. 그 결과 HAPS가 Iridium 시스템에 미치는 간섭의 경우 최저 C/I 값은 HAPS 고도가 50Km일 때 20.42dB, 20Km일 때는 12.73dB로 낮아지고, 이와 반대로 Iridum 시스템이 HAPS에 미치는 간섭의 경우도 각각 13.94dB에서 10.42dB로 낮아짐을 알 수 있었다. HAPS 고도에 따른 간섭영향을 보면, 고도가 낮아질수록 강한 간섭을 주거나 받게 되며, C/I 최저값 또한 HAPS 고도에 따라 다른 시점에서 나타난다.