Titanium Phosphide 표면에 대한 세포독성 및 골친화성의 평가

이강진,김천석,김형수,염창엽,김병옥,한경윤,Lee, Kang-Jin,Kim, Chun-Seok,Kim, Hyung-Soo,Yum, Chang-Yup,Kim, Byung-Ock,Han, Kyung-Yoon 대한치주과학회 1997 Journal of Periodontal & Implant Science Vol.27 No.2

Dental implants have been developed for enhancement of osseointegration. Biocompatibility, bone affinity and surface characteristics of dental implants are very important factors for osseointegration. The aim of the present study was to determine the cytotoxicity and the bone affinity of titanium phosphide(Ti-P) implant material. The Ti-P surface was obtained by vacuum sintering of titanium within compacted hydroxyapatite powder. The composition and the chemical change of the surface were determined by Auger electron spectroscopy. The in vitro cytotoxicity was evaluated by the viability of the bone cells and macrophages obtained from chicken embryo and rat,s peritonium, respectively. For the comparative evaluation, 316L stainless steel, commercially pure titanium and Ti-P materials, prepared in size of 1O.0mm in diameter and 5.0mm in height, were immersed separately in bone cells and macrophages for 10 days. For the evaluation of the in vivo bone affinity, 316L stainless steel, commercially pure titanium and Ti-P materials, prepared in size of 5.0mm in diameter and 10.0mm in length, were implanted after drilling in diameter 5.5mm in femurs of 2 dogs weighing 10Kg more or less. Six weeks after implantation the specimens were prepared for histopathological examination and were observed under light microscope. In comparison of in vitro bone cell viability, Ti-P and commercially pure titanium groups were not significantly different from control group (p>O.1), but 316L stainless steel group was significantly lower than control group(p<0.05). There was no statistical difference in the viability of macrophages between 3 different groups and control group(p>O.l). In comparison of in vivo study, 316L stainless steel and commercially pure titanium showed fibrous encapsulation, but Ti-P showed remarkable new bone formation without any fibrous tissue. The results demonstrate that Ti-P has favorable biocompatibility and bone affinity, and suggest that dental implants with Ti-P surface may enhance osseointegration.

[전북] 스마트산단 육성으로 포스트 코로나 대비해야

이강진 한국자치학회 2020 월간 공공정책 Vol.181 No.-

2021년 7월 동해 주변에서 나타난 고온 현상과 발생 기작

이강진,권민호,강현우 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10

지구 온난화와 기후 변동성의 증가로 과거에 경험하지 못한 이상기후 현상의 발생 빈도가 증가하고 있다. 세계기상기구는 이상기후를 기온, 강수량 등의 기후요소가 평년값에 비해 현저하게 높거나 낮은 극한현상으로 정의하고 있으며, 이는 90퍼센타일을 초과하거나 10퍼센타일 미만의 범위에 해당한다. 올해도 이상기후는 세계 곳곳에서 끊임없이 발생하고 있다. 프랑스 전역에서는 봄철 한파로 4월 일시적으로 영하의 기온을 기록하였으며, 러시아 모스크바에서는 봄철부터 계속된 폭염으로 기상관측 사상 가장 높은 6월 기온을 기록하였다. 미국과 캐나다 서부에서는 6월 기록적인 폭염으로 많은 사망자가 발생했다. 중국 정저우에서는 7월 중 사흘 동안 연강수량에 준하는 폭우를 기록하였으며, 서유럽을 강타한 폭풍의 영향으로 독일 쾰른에서는 7월 중 하루 동안 월평균 강수량의 2배를 초과하는 폭우와 홍수가 발생하면서 많은 사망자가 발생했다. 고온와 관련된 극한현상의 경우 해양에서는 고수온에 의한 녹조의 증가와 어패류의 폐사 등 해양생태계에 큰 영향을 미칠 수 있으며, 육지에서는 폭염에 의한 온열질환 등의 인명피해를 야기할 수 있다. 국립기상과학원의 연구결과에서도 지난 100년간 우리나라에서 단일 기상재해에 의한 최대 인명피해는 1994년 폭염 때 발생한 것으로 보고된 바 있다. 세계 각국의 이상기후 발생과 함께 한반도 주변에서도 지난 7월 고온과 관련된 극한현상이 발생하였으며, 그 결과 동해를 중심으로 지난 40년 중 가장 높은 기온이 기록되었다. 본 연구에서는 7월 한반도 주변의 상·하층 대기환경, 원격상관, 파동 속 분석 등을 통해 동해를 중심으로 발생한 이례적인 고온 현상을 유도한 기작을 규명하고자 한다.

국가균형발전특별회계의 기초자치단체에 대한 재원배분 방안에 관한 연구: 전라북도를 중심으로

이강진 한국지방재정학회 2008 한국지방재정논집 Vol.13 No.2

Since the adoption of local self-government regime, expansion of local government's budget autonomy, through local finance equalization scheme, has been an on going issue for policy makers. In spite of differences in the shape and the origin of funds, this will be a constant issue and even for the new government. The participatory government has devised the national balanced growth special account and applied its distribution scheme from year 2006. Each local government has been applying it from the next year. In order for the national balanced growth special account budget to be distributed fairly and objectively, each local government should have developed her own distribution scheme. This study elaborates the process and challenges of developing a Jeonbuk province's national balanced growth special account budget distribution scheme. We used regression method to develop new models and compared these to old distribution methods and found that the former is logically superior to the latter. This study will stimulate the local government's interest for developing objective budget distribution scheme for her province. Since the adoption of local self-government regime, expansion of local government's budget autonomy, through local finance equalization scheme, has been an on going issue for policy makers. In spite of differences in the shape and the origin of funds, this will be a constant issue and even for the new government. The participatory government has devised the national balanced growth special account and applied its distribution scheme from year 2006. Each local government has been applying it from the next year. In order for the national balanced growth special account budget to be distributed fairly and objectively, each local government should have developed her own distribution scheme. This study elaborates the process and challenges of developing a Jeonbuk province's national balanced growth special account budget distribution scheme. We used regression method to develop new models and compared these to old distribution methods and found that the former is logically superior to the latter. This study will stimulate the local government's interest for developing objective budget distribution scheme for her province.

2005년 석유수급 전망

이강진,Lee, Gang-Jin 대한석유협회 2001 석유와 에너지 Vol.2001 No.5

한반도 여름철 폭염과 열대야의 최근 발생 경향

이강진,권민호 한국기상학회 2019 한국기상학회 학술대회 논문집 Vol.2019 No.10

충돌과냉수분류(衝突過冷水噴流)의 비등열전달(沸騰熱傳達)에 관한 연구(硏究)

이강진,이종수,엄기찬,조용철,서정윤,Lee, G.J.,Lee, J.S.,Ohm, K.C.,Cho, Y.C.,Seo, J.Y. 대한설비공학회 1993 설비공학 논문집 Vol.5 No.1

This paper describes the boiling heat transfer phenomena to be divided into three regions, nonboiling, nucleate boiling and burn-out in the impinging subcooled water jet system. In the nonboiling region, Nusselt number is a function of Prandtl number, Reynolds number and ${\Delta}T_{sub}/T_{ast}$ In the nucleate boiling region, the heat flux increases with increment of the nozzle exit velocity. But the degree of liquid subcooling does not affect the shape of the nucleate boilng curve. The dimensionless correlations can be expressed in the form of $q{\ell}/K_f{\Delta}T_{ast}=C(Bo{\cdot}C_p{\cdot}{\Delta}T_{sat}/Vo^2)^m{\cdot}(Re/We)^n$. The burn-out heat flux increases linearly with increment of the nozzle exit velocity, but independs of degree of subcooling and the supplementary water height.

근적외선을 이용한 신고 배 당도판정에 있어표면온도영향의 보정

이강진,최동수,최규홍,김기영 한국농업기계학회 2002 바이오시스템공학 Vol.27 No.2

미래 시설원예 연구를 위한 테스트베드 구축: 농쳔진흥청 농업공학부 첨단디지털온실

이강진,권진경,이시영,강태경,최인찬 한국농공학회 2022 韓國農工學會誌 : 전원과 자원 Vol.64 No.1

근적외선을 이용한 사과의 당도예측 (I) - 다중회귀모델 -

이강진,노상하,W. R. Hruschka,J. A. Abbott,B. S. Park 한국농업기계학회 1998 바이오시스템공학 Vol.23 No.6

The MLR(Multiple Linear Regression) models to estimate soluble solids content non-destructively were presented to make a selection of optimal photosensor utilized to measure the soluble solids content of apples. Visible and NIR absorbance in the 400 to 2498 nanometer(nm) wavelength region, soluble solids content(sugar content), hardness, and weight were measured for 400 apples(gala). Spectrophotometer with fiber optic probe was utilized for spectrum measurement and digital refractometer was used for soluble solids content. Correlation between absorbance spectrum and soluble solids content was analyzed to pick out the optimal wavelengths and to develop corresponding prediction model by means of MLR. For the coefficient of determination($R^2$) to be over 0.92, the MLR models out of the original absorbance were built based on 7 wavelengths of 992, 904, 1096, 1032, 880, 824, 1048nm, and the ones of the second derivative absorbance based on 5 wavelengths of 784, 1056, 992, 808, 872nm. The best model of the second derivative absorbance spectrum had $R^2$=0.91, bias= -0.02bx, SEP=0.28bx for unknown samples.