• 한국작물학회지
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• 제57권3호
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• pp.296-300
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• 2012

국내산 콩과 수입콩의 판별에 NIRS를 도입함으로써 보다 빠르고 정확한 식별분석을 하고자 실험을 수행하였다. NIRS를 사용하여 400~2,500 nm 범위에서 콩 분말의 파장을 측정하였으며, 측정된 spectrum은 WINISI II program 을 이용하여 수처리와 회귀분석을 하였다. 검량식 작성을 위한 수처리는 spectrum을 1차미분 및 4 nm gap으로 조정한 것이 가장 적합하였으며, 회귀식은 변형부분최소자승회귀법(Modified partial least squares regression)이 우수하였다. MPLS 회귀분석시 원산지 판별을 위해 loading value를 국내산 콩은 '100', 수입콩은 '1'로 처리하여 검량식을 작성하고 그 적합성을 검증한 결과 factor가 10일 때 도출된 calibration equation의 상관값이 0.98, 교차검증의 상관값이 0.94를 나타내어 상관도가 높음을 알 수 있었다. 따라서 NIRS를 이용한 국내산 콩과 수입콩의 판별분석이 가능할 것으로 판단되었다.

• 대한족부족관절학회지
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• 제7권1호
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• pp.109-114
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• 2003

Purpose: The purpose of this study is to evaluate the effectiveness and indications of the modified Essex-Lopresti reduction in calcaneal fractures. Materials and Methods: We reviewed retrospectively 41 cases of displaced intraarticular calcaneal fractures. The fracture was reduced with Essex-Lopresti technique with modification in compression of the lateral wall with the specially designed compression device instead of the operator's hands. We evaluated the results of treatment by AOFAS scale and the radiographic parameters including the Bohler's angle, calcaneal width, calcaneofibular distance and the congruency of the posterior facet. Results: Boler's angle was restored from 11 to 29.6 degrees on average, heel width was reduced to 112% of contralateral value, the calcaneofibular gap was restored up to 87.9% of contralateral side, and the articular surface of the posterior facet was restored less than 2 mm of step off and less than 2 mm of gap. AOFAS scale averaged 87 points. The quality of reduction was best in Sander's type II fractures. Small sized fragments in type III fractures could not be reduced. The results were better when the reductions were performed within 24 hours of injury. Conclusion: The modified Essex-Lopresti reduction was less invasive, easy to perform, and the results of treatment were similar to those of open reduction; it seemed to be a reasonable alternative for the selected intraarticular calcaneal fractures.

• 한국진공학회지
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• 제9권4호
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• pp.406-410
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• 2000

Hot-wall epitaxy 방법으로 GaAs (100) 기판 위에 9 $\mu\textrm{m}$의 CdTe (111)을 완충층으로 성장하고 그 위에 in-situ로 $Hg_{1-x}Cd_x$/Te (MCT)박막을 성장하였다. 성장된 MCT박막의 2결정 x-선 요동곡선의 반치폭 값은 125 arcsec이었으며 표면 형상의 roughness는 10 nm의 작고 깨끗한 면을 나타내었다. 성장된 MCT 박막에 대한 광전류 측정으로부터 최대 peak 파장과 cut off 파장은 각각 1.1050 $\mu\textrm{m}$ (1.1220 eV)와 1.2632 $\mu\textrm{m}$ (0.9815 eV)임을 알았다 이 peak 파장은 광전도체의 intrinsic transition에 기인한 band gap에 대응하는 봉우리이다. 이로부터 MCT 박막은 1.0 $\mu\textrm{m}$에서 1.6 $\mu\textrm{m}$의 근적외선 파장 영역을 감지할 수 있는 광전도체용 검출기로 쓰일 수 있음을 알았다.

• The Journal of Advanced Prosthodontics
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• 제6권1호
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• pp.46-52
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• 2014

PURPOSE. The aim of this study was to evaluate the interface accuracy of computer-assisted designed and manufactured (CAD/CAM) titanium abutments and implant fixture compared to gold-cast UCLA abutments. MATERIALS AND METHODS. An external connection implant system (Mark III, n=10) and an internal connection implant system (Replace Select, n=10) were used, 5 of each group were connected to milled titanium abutment and the rest were connected to the gold-cast UCLA abutments. The implant fixture and abutment were tightened to torque of 35 Ncm using a digital torque gauge, and initial detorque values were measured 10 minutes after tightening. To mimic the mastication, a cyclic loading was applied at 14 Hz for one million cycles, with the stress amplitude range being within 0 N to 100 N. After the cyclic loading, detorque values were measured again. The fixture-abutment gaps were measured under a microscope and recorded with an accuracy of ${\pm}0.1{\mu}m$ at 50 points. RESULTS. Initial detorque values of milled abutment were significantly higher than those of cast abutment (P<.05). Detorque values after one million dynamic cyclic loadings were not significantly different (P>.05). After cyclic loading, detorque values of cast abutment increased, but those of milled abutment decreased (P<.05). There was no significant difference of gap dimension between the milled abutment group and the cast abutment group after cyclic loading. CONCLUSION. In conclusion, CAD/CAM milled titanium abutment can be fabricated with sufficient accuracy to permit screw joint stability between abutment and fixture comparable to that of the traditional gold cast UCLA abutment.

• The Journal of Advanced Prosthodontics
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• 제11권6호
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• pp.341-349
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• 2019

PURPOSE. A novel retentive type of implant prosthesis that does not require the use of cement or screw holes has been introduced; however, there are few reports examining the biomechanical aspects of this novel implant. This study aimed to evaluate the biomechanical features of cementless fixation (CLF) implant prostheses. MATERIALS AND METHODS. The test groups of three variations of CLF implant prostheses and a control group of conventional cement-retained (CR) prosthesis were designed three-dimensionally for finite element analysis. The test groups were divided according to the abutment shape and the relining strategy on the inner surface of the implant crown as follows; resin-air hole-full (RAF), resin-air hole (RA), and resin-no air hole (RNA). The von Mises stress and principal stress were used to evaluate the stress values and distributions of the implant components. Contact open values were calculated to analyze the gap formation of the contact surfaces at the abutment-resin and abutment-implant interfaces. The micro-strain values were evaluated for the surrounding bone. RESULTS. Values reflecting the maximum stress on the abutment were as follows (in MPa): RAF, 25.6; RA, 23.4; RNA, 20.0; and CR, 15.8. The value of gap formation was measured from 0.88 to 1.19 ㎛ at the abutment-resin interface and 24.4 to 24.7 ㎛ at the abutment-implant interface. The strain distribution was similar in all cases. CONCLUSION. CLF had no disadvantages in terms of the biomechanical features compared with conventional CR implant prosthesis and could be successfully applied for implant prosthesis.

• 한국안광학회지
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• 제5권2호
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• pp.193-199
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• 2000

수소화된 비정질 탄소 박막은 PECVD 방법으로 제작하였으며 박막의 증착률은 아세틸렌 가스의 함량에 의존하였다. 이것은 메탄 기체를 사용하였을 때와 비교해 조금 높았다. 박막의 광학적 밴드 갭은 1.4~1.8eV였으며 아세틸렌 함량에 밀접한 연관성을 보여주었다. Raman과 FTIR 분광에 의하여 $sp^3/sp^2$의 정성적인 분율을 결정할 수 있었으며 이러한 결과로부터 아세틸렌 함량 13.8%의 박막이 최적의 조건이었다.

• 한국콘텐츠학회논문지
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• 제20권1호
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• pp.530-538
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• 2020

최근 우리나라의 자살률 문제가 매우 심각한 상황에서 지방자치단체들은 자살률을 낮추는 것을 목표로 다양한 정책 노력을 추진하고 있다. 본 연구는 지역 간 자살률의 차이를 평가하고 집중지수(CI)를 산출하여 그 변화추이를 확인함으로써 지방자치단체의 노력에 근거를 제시하고자 한다. 주요 연구결과는 다음과 같다. 첫째, 지난 20년간 시군구 자살률은 군 지역 자살률이 가장 높고 구 지역이 가장 낮아서 도시 지역일수록 자살률이 낮은 현상이 지속되었다. 둘째, 시군구 자살률은 모든 지역에서 증가하고 있지만 구 지역과 군 지역의 자살률 격차는 감소하고 있었다. 즉, 도시와 농어촌 지역의 자살률 차이가 감소하고 있는 것이다. 셋째, 지역 간 자살률 차이를 지속적으로 모니터링하기 위해 산출한 집중지수 산출결과 20년 전체 자살률 집중지수가 모두 음(-)의 값으로 나타나서 인구밀도가 낮은 농어촌 지역의 자살률이 높았다. 넷째, 20년간 집중지수의 절대 값이 지속적으로 감소하고 있어서 농어촌과 도시 지역의 자살률 격차는 감소하고 있는 것으로 나타났다. 따라서 지역 간 자살률은 상향 평준화하고 있는 것으로 평가된다.

• 한국콘텐츠학회논문지
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• 제18권6호
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• pp.294-302
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• 2018

한국 정부의 게임 산업 규제는 부모 세대가 자녀의 게임 행위를 규제하는 것과 밀접한 관련이 있다. 이것은 부모와 자녀 간에 디지털 문화 경험의 차이가 존재하기 때문이다. 이 연구는 도덕적 가치가 게임 사용자의 자각 또는 인식에 어떻게 영향을 미치는지에 대한 차이점을 살펴보았다. 연구 결과에서 규범 순응은 게이머에 대한 인식에 부정적인 영향을 미치는 것으로 나타났다. 연령 또한 게이머들에 대한 인식에 부정적인 영향을 미쳤다. 이러한 결과를 바탕으로 우리는 또한 연령의 중재 효과가 게임 이용자에 대한 규범 순응과 게이머에 대한 인식의 관계와 관련하여 발견된다는 것을 확인했다. 결론적으로 이 연구는 한국의 게임 산업 진흥 정책은 목표를 모든 사람에게 초점을 맞추는 것에서부터 고 연령층에게 맞추는 것으로 전환해야한다고 제안한다.

• 산업경영시스템학회지
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• 제40권4호
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• pp.221-229
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• 2017

In the international businesses human resource elements acquired in different countries might have different values in varied industries due to the different quality of education and experiences in the original countries. Using selection models to evaluate expected values in earnings equation of human resource elements such as education and experiences etc. acquired in sending countries, system equations are expanded to examine also the values of science and engineering degrees in technology jobs with selectivity bias correction. This paper used the US census survey data of 2015 on earnings, academic degrees, occupations etc. The US has long maintained the policy of accepting more STEM workers than any other countries and helped maintaining own technological leadership. Assuming per capita GDP gap between the sending country and the US downgrades immigrant human resource quality, it rarely affects occupational selection but depresses earnings on average by two or more years' worth of education. Immigrant quality index in the sense of GDP gap appears to be a valid tool to assess the expected earnings of the worker with. Engineering degrees increase significantly the probability of selecting not only engineering jobs but also general management jobs, as well as increasing the expected earning additionally over nine years'worth of education. Getting a technology job is additionally worth about four years of education. Economics and business degrees are worth additionally almost six years of education but humanities degrees depress expected earnings. Since years after immigration does not very fast enhance earnings capacity, education level and English language ability might be more useful criteria to expect better future earnings by.

• 대한치과보철학회지
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• 제38권6호
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• pp.800-805
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• 2000

In an effort to facilitate fabrication procedure of all ceramic crowns, a novel preparation method for all ceramic crown using alumina tape was developed. The alumina tape having a uniform thickness was cast by using Doctor blade method. The physical properties of newly introduced alumina tape has biaxial flexure strength of $500\sim600MPa$. The value of toughness is $3.18\sim3,28MPa.m^{1/2}$ which corelates with fracture and the linear shrinkage rate of the alumina tape is 0.44% during core production. The marginal fitness of the alumina tape all-ceramic restoration with $90{!`}$shoulder margin had average marginal discrepancy at $78.3{\S}$ > and average marginal gap at $44.4{\S}$ >. At the marginal preparation of $135{!`}$deep chamfer, the average marginal discrepancy at $82.1{\S}$ > and the average marginal gap at $40.2{\S}$ > had been reported. This fabrication procedure of all ceramic crowns with alumina tapes is easier and less technical sensitive for dental technicians. After restoration with new all ceramic crowns we followed the patients 2 years later, there were no complications as porcelain fractures or periodontal disease. We had good esthetic clinical results with new all ceramic crowns.