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정재호,목철균,임상빈,박영서,Chung, Jae-Ho,Mok, Chul-Kyoon,Lim, Sang-Bin,Park, Young-Seo 한국응용생명화학회 2003 Applied Biological Chemistry Vol.46 No.3
An apple wine was prepared by fermentation at $25^{\circ}C$ for 2 weeks using Saccha개myces cerevisiae KCCM 12224, followed by aging at $15^{\circ}C$ for 14 weeks, and its physicochemical and microbiological changes were investigated. The viable bacterial cell numbers, increased from $1.4{\times}10^3\;CFU/ml$ at the beginning of fermentation, to $2.8{\times}10^6\;CFU/ml$ after 2 weeks, but decreased to $1.0{\times}10^5\;CFU/ml$ after aging. The viable yeast cell numbers changed from $4.3{\times}10^4\;CFU/ml$ to $1.2{\times}10^7\;CFU/ml$ during the fermentation, and decreased to $1.2{\times}10^4\;CFU/ml$ after aging. Sugar content changed from $20.0^{\circ}Brix$ to $8.5{\circ}Brix$, and reducing sugar content was changed from 9.66% to 6.44%. Alcohol content and acidity increased to 7.0% and from 0.19% to 0.24%, respectively. No changes in acidity, pH, and sugar content were observed during the aging, but reducing sugar and solid contents decreased. When apple wine was fultered through $0.45\;{\mu}m$ nitrocellulose membrane followed by various ultrafiltration membranes with different molecular weight cut-off values, the initial flux $(121.2\;liter/m^2/h)$ and the average flux of Biomax 100k membrane were the highest among the membranes used. These membrane filtration treatments resulted in complete removal of microorganisms as well as decrease in turbidity and solid content without changes in other chemical properties. No changes in the physicochemical properties of the apple wine and no microorganisms were detected during the storage at $156{\circ}C$ for 6 weeks.
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AHP기법을 이용한 국토정보 관련산업의 진흥 및 육성에 관한 연구 : 대한지적공사의 업무를 중심으로
정재호(Chung, Jae Ho),김형태(Kim, Hyung Tae),김종하(Kim, Jong Ha),안재성(Ahn, Jae Seong) 한국지적학회 2015 한국지적학회지 Vol.31 No.1
최근 국토정보 관련산업은 국토 및 공간정보 기술을 정보통신기술 및 타 분야 기술과 융합하여 신산업 및 신서비스를 창출하는 방향으로 발전하고 있다. 본 연구는 국토정보 관련산업 진흥 육성을 위한 대한지적공사의 역할을 모색하기 위해서 산업 진흥 육성 우선순위를 제시하는 것이 목적이다. AHP 기법을 적용한 전문가 설문을 실시하여 우선순위 평가지표에 대한 가중치를 구한 후, 다섯 종류의 국토정보 관련산업을 진흥 육성 사업 참여와 미 참여로 구분하여 대안을 평가하였다. 평가 결과를 보면, 전문가들은 대한지적공사가 국토정보 생성 및 관리–국토정보 가공 및 융합–국토정보 유통–국토정보 이용 및 활용–국토정보 상품화 순으로 국토정보 관련산업을 진흥 육성해야 함을 제시하고 있다. 향후, 국토정보공사로 사명을 변경하는 대한지적공사의 사업 추진 과정에서 국토정보 관련산업 진흥 육성 사업 우선순위를 정할 때 본 연구 결과가 근거 자료로 활용될 수 있을 것으로 기대된다. National geospatial information industry has been growing with the creation of new industries and services based on the convergence with the national geospatial information technologies and other industries. The priorities analysis is conducted with AHP in the promotion of national geospatial information industry, focusing on korea cadastral survey corporation. The result shows that experts recommend that korea cadastral survey corporation should foster the national geospatial information industries in the following order: generation and management, processing and convergence, use and application, commercialization. It is expected that this research result is used as the base data for decision making of the business promotion for national geospatial information industry.
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거시경제변수와 부동산변수를 이용한 대전광역시 아파트가격에 관한 연구
정재호(Jae Ho Chung), 이석원(Seok Won Lee) 한국부동산융복합학회 2025 부동산융복합연구 Vol.5 No.4
This study conducted a multivariate time series analysis utilizing macroeconomic and regional variables to analyze factors affecting apartment prices in Daejeon. Unit root and cointegration tests were used to confirm long-term relationships between variables, and the VEC model was applied to analyze short- and long-term influences. The analysis revealed that interest rates and the Consumer Price Index significantly impacted apartment prices in the long term, while mortgage loan amounts and the Industrial Production Index, which represents income, were key variables in the short term. This suggests that apartment prices in Daejeon are significantly influenced not only by macroeconomic variables but also by regional economic and credit conditions, highlighting the need for real estate policies that take regional characteristics into account.
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정재호 ( Jae Ho Chung ),조수희 ( Soo Hee Cho ) 한국건설경제산업학회 2011 건설경제산업연구 Vol.2 No.2
Government had expanded financial investment on sex: such as transportation facilities to reduce logistics costs and to stimulate the economy since the 1990s, however it reduced its budget since 2003. Even Sex: investment was increased temporarily in 2009 and 2010, investment in the transport sector has been continuously decreasing. The purpose of this paper is trying to find optimal investment size in debate of the sex: investment size and the investment direction. The previous research focused on sex: trends and physical units, such as road and railway extension by comparing the country, or used economic model as analysis method. This study adopts both analysis of the physical(stock) size of the sex: and analysis of as model results. And we select 4 standards, the stock size, the percentage of Sex:, the portion of SOC, the assets of SOC using the data of recent international data, such as OECD, ITF, World Bank, IMD. This paper``s updated information will be helpful on government policy as a reference. We found decision of optimal investment is depend on criteria to select physical stock, financial stock, ratio, or portion. Government should decide optimal investment by comprehensive review and analysis of omnifaceted aspects, such as social, economical, geographical, environmental, and political conditions considering our condisions.
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자가치아 뼈 이식재의 발치와내 이식 후 골 치유 양상에 관한 연구
정재호(Jae-Ho Chung),이재훈(Jae-Hoon Lee) 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.5
Introduction: Research on dental bone graft material has been actively conducted. Recently, demineralized dentin matrix material has been developed and introduced. This study examined the effect of demineralized dentin matrix material on bone healing. Subjects and Methods: The patients who received no treatment after extraction were used as the control group and patients who underwent demineralized dentin matrix material application in the extraction socket after extraction were used as the experimental group. Panorama radiography was performed at the baseline and at 3.5 months after graft material placement and CT was taken at 3.5 months after graft material placement for a radiologic evaluation. Bony tissue specimens were collected from the alveolar crest in the middle of the extraction socket using a 2 mm trephine bur after 3.5 months for the histology and hostomorphometric study. Results: 1. On the panoramic view, a higher bone density was observed in the subject group. 2. On the panoramic view, the bone density increased significantly in the extraction socket, from the baseline to 3.5 months: a 7 and 10 gray-level scale was observed in the control and experimental group, respectively (P<0.05). 3. The CT view evaluation at 3.5 months revealed significantly higher bone density in the subject group than the control group (P<0.05). 4. The histological findings showed more active new bone and lamellar bone formation in the subject group. Dentin with osteoinduction ability and enamel with osteoconduction ability appeared. 5. On histomorphometric analysis, the subject group showed significantly more new bone, lamellar bone area and lower soft tissue area (P<0.05). The difference between the groups was significant (P<0.05). Conclusion: Bone healing was improved after the application of demineralized dentin matrix material and there was active new bone and lamellar bone formation.
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대외적 변동성충격에 대한 국면별 주택시장의 비대칭적 반응 연구
정재호(Chung, Jae-Ho),김종하(Kim, Jong-Ha) 한국부동산정책학회 2018 不動産政策硏究 Vol.19 No.1
The objective of this study was to empirically analyze the asymmetric response of the housing market to the volatility shocks. Two regimes were assumed for the analysis and the analysis period was from January 2004 to December 2017. The analysis results of the study implied that, first of all, the housing market revealed volatility clustering. In other words, it showed considerable variations over a substantially long period and maintained a relatively stable period alternately. Moreover, the results of this study confirmed that there was a GARCH effect within each regime. Secondly, the variables affecting the housing price earning rate varied by regime. The exchange rate was the main variable of this study and it was more influential in regime 2 than in regime 1. Therefore, it would be important to manage the interest rate politically when an external shock occurs. Thirdly, the mortgage interest rate had different effects on the housing market in regime 1 and regime 2. It adversely affected the housing price agreeing with the theoretical basis during regime 1. However, it had positive effects on the housing price during the regime 2, accompanying with abrupt volatility. In other words, if a volatility shock occurs in the South Korean housing market, the volume of the mortgage loan will increase even though the price is rising.
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