한외여과공정을 이용한 사과주의 품질개선

정재호,목철균,임상빈,박영서,Chung, Jae-Ho,Mok, Chul-Kyoon,Lim, Sang-Bin,Park, Young-Seo 한국응용생명화학회 2003 한국농화학회지 Vol.46 No.3

사과 착즙액을 효모를 이용하여 발효시키는 과정에서 사과주의 발효패턴을 관찰하였으며 숙성과정 및 한외여과에 따른 미생물학적 변화와 이화학적 특성을 조사하였다. 사과 착즙액을 Saccharomyces cerevisiae KCCM 12224를 사용하여 $25^{\circ}C$에서 14일간 발효시킨 후 $15^{\circ}C$에서 14주간 숙성시킨 결과 발효기간 중 총세균과 효모는 각각 $1.4{\times}10^3$ CFU/ml, $4.3{\times}10^4$ CFU/ml에서 $2.8{\times}10^6$ CFU/ml, $1.2{\times}10^7$ CFU/ml로 증가하였다. 숙성과정을 거친 후에는 총세균수는 $10{\times}10^5$ CFU/ml로, 효모수는 $1.2{\times}10^4$ CFU/ml로 감소하였다. 발효기간 중 당도는 $20.0^{\circ}Brix$에서 $8.5^{\circ}Brix$로, 환원당은 9.66%에서 6.44%로 감소한 반면, 알코올 함량은 7.0%로, 산도는 0.19%에서 0.24%로 증가하였다. 14주 동안 숙성하였을 때 pH, 산도, 당도는 큰 변화를 보이지 않은 반면, 환원당과 고형물 함량은 감소하였고 알코올 함량은 11.8%까지 증가하였다. 사과주를 $0.45\;{\mu}m$ nitrocellulose 미세여과막을 이용하여 여과한 후 재질과 공경이 서로 다른 한외여과막을 사용하여 한외여과한 결과 Biomax 100k 막의 초기 $flux(121.2\;liter/m^2/h)$와 평균 flux가 사용한 한외여과막 중에서 가장 높았다. 한외여과에 의해 사과주 내에 존재하는 미생물은 완벽하게 제거되었으며 탁도와 고형물 함량은 감소하였으나 그 이외의 이화학적 특성은 변화하지 않았다. 사과주를 $15^{\circ}C$에서 6주간 저장하였을 경우 저장기간동안 미생물이 전혀 검출되지 않았으며 이화학적 특성도 변화하지 않았다. 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.

복숭아주 발효시 이화학적 특성변화와 한외여과에 의한 품질 향상

정재호(Jae-Ho Chung),목철균(Chulkyoon Mok),임상빈(Sangbin Lim),박영서(Young-Seo Park) 한국식품영양과학회 2003 한국식품영양과학회지 Vol.32 No.4

복숭아 착즙액의 당도를 24°Brix로 조절하여 25℃에서 2주간 발효하여 제조한 후 15℃에서 14주간 숙성과정 중 복숭아주의 이화학적 성분 및 미생물의 변화를 살펴보았으며 한 외여과 후의 복숭아주의 이화학적 특성의 변화를 관찰하였다. 총 세균수는 발효 초기 2.8×10² CFU/mL에서 2주간의 발효 후에는 2.4×107 CFU/mL로 증가한 후 숙성과정을 거친 후에는 7.0×10³ CFU/mL로 다시 감소하였다. 효모의 경우에는 발효 초기 3.4×10² CFU/mL에서 발효 후에는 2.4×10^7 CFU/mL로 증가한 후, 숙성과정을 거친 후에는 4.0×10⁴ CFU/mL로 역시 감소하는 경향을 보였다. 탁도, 총당, 환원당, 고형물 함량과 b값은 발효가 진행됨에 따라 감소하였고, 산도, 알코올 함량, L값과 a값은 증가하는 경향을 나타내어 발효가 완료된 후의 산도는 0.41%, 알코올 함량은 8.2%의 값을 보였다. 숙성과정 중에는 알코올 함량이 증가한 반면 환원당 함량은 감소하였다. 복숭아주를 0.45 ㎛ nitrocellulose 미세여과막을 이용하여 여과한 후 재질과 공경이 서로 다른 한 외여과막을 사용하여 한외여과한 결과 Biomax 100K 막이초기 flux가 79 liter/㎡/h(LMH)로 가장 높았으며 평균 flux도 가장 우수하여 한외여과공정의 최적 한외여과막으로 선정하였다. 한외여과에 의해 복숭아주 내에 존재하는 미생물은 완벽하게 제거되었으며 탁도와 알코올 함량은 약간 감소하였으나 그 이외의 이화학적 특성은 크게 변화하지 않았다. 복숭아주를 30℃에서 12주간 저장하였을 경우 저장기간동안 미생물이 전혀 검출되지 않았으며 이화학적 특성도 변화하지 않았다. Peach wine was fermented at 25℃ for 2 weeks using Saccharomyces cerevisiae KCCM 12224, aged at 15℃ for 14 weeks, and its physicochemical and microbiological changes were investigated. The viable bacterial cell numbers, 1.4×10³ CFU/mL at the beginning of fermentation, increased to 2.8×10^6 CFU/mL after 2 weeks, but decreased to 7.0×10³ CFU/mL after 14 weeks. The viable yeast cell numbers were changed from 3.4×10² CFU/mL to 2.4×10^7 CFU/mL during fermentation, and decreased to 4.0×10⁴ CFU/mL after aging. Turbidity, total sugar content, reducing sugar content, solid content and b value of peach wine decreased during fermentation, but acidity, alcohol content, L and a value increased. Most physicochemical properties except alcohol content and reducing sugar content were not changed significantly during aging. When peach wine was filtered through 0.45 ㎛ nitrocellulose membrane followed by various ultrafiltration membranes with different molecular weight cut-off values, Biomax 100K membrane, with 79 liter/㎡/h (LMH) of initial flux, was suitable for ultrafiltration process of peach wine. These membrane filtration treatments resulted in complete removal of microorganisms and decrease in turbidity and alcohol content without changes in other chemical properties. The physicochemical properties of peach wine were not changed and any microorganisms were not found during the storage at 30℃ for 12 weeks.

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.

코로나19 이후의 세계변화 전망

정재호(Chung Jae-ho) 한국외교협회 2020 계간 외교 Vol.- No.134

한외여과공정을 이용한 포도주의 품질개선

정재호(Jae-Ho Chung),목철균(Chulkyoon Mok),임상빈(Sangbin Lim),박영서(Young Seo Park) 한국식품과학회 2003 한국식품과학회지 Vol.35 No.3

전기투석에 의한 재래식 간장의 저염화

정재호(Jae-Ho Chung),목철균(Chulkyoon Mok),임상빈(Sangbin Lim),우건조(Gun-Jo Woo),백형희(Hyung-Hee Baek),박영서(Young Seo Park) 한국식품과학회 2002 한국식품과학회지 Vol.34 No.5

기관지주위 병변과 점막하 병변을 보이는 폐암의 진단에 있어서 경기관지 침흡인술의 유용성

정재호 ( Jae Ho Chung ),최정은 ( Jeong Eun Choi ),박무석 ( Moo Suk Park ),김영삼 ( Young Sam Kim ),장준 ( Joon Chang ),김성규 ( Sung Kyu Kim ),김세규 ( Se Kyu Kim ) 대한결핵 및 호흡기학회 2004 Tuberculosis and Respiratory Diseases Vol.56 No.4

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.

세종·대전·충청지역 간 아파트 가격과 거래량의 상호 영향관계 연구

정재호(Chung, Jae-Ho) 한국부동산정책학회 2020 不動産政策硏究 Vol.21 No.3

The purpose of this study is to analyze the influence and reaction relationship between the price and trading volume of the housing market among Sejong, Daejeon, and Chungnam. For the purpose of this study, this study applied monthly data from the Korea Appraisal Board from July 2012 to August 2020 as the actual apartment transaction price index and number of transactions in Daejeon, Sejong, and Chungnam. According to the results of the VEC analysis, it can be confirmed that the long-term equilibrium relationship between regions shows a positive causal relationship with each other overall. It can be seen that during the analysis target period, the actual transaction price index and the number of transactions were generally similar. Through the analysis of the impulse response function, the actual transaction price index in Daejeon shows a positive (+) effect on the region to be analyzed, but the actual transaction price index and the number of transactions in Sejong and Chungnam regions are negative (-). It has been shown to have an impact and play a competitive role. According to the results of variance decomposition analysis, it was found that the Daejeon real transaction price index has a high impact on the real estate market in Daejeon, Sejong, and Chungnam regions, and the actual transaction price index in Daejeon, Sejong, and Chungnam regions has an effect on the Daejeon actual transaction price index. It was found to be the largest except for its own variable. In the case of the transaction status, the actual transaction price index of each region was found to have a large effect on the actual transaction price index of Sejong, and it was confirmed that the formation of the actual transaction price index in the new city had an effect on the transaction status.

중소기업 정책자금 금리의 효과분석

정재호(Jae ho Chung),박재필(Jae pil Park) 글로벌경영학회 2010 글로벌경영학회지 Vol.7 No.2

본 연구는 고용과 생산측면에서 중요한 위치를 차지하고 있는 중소기업에 대한 정부 정책자금지원의 효과를 계량적으로 분석했다. 기존 연구와는 상이하게 정책자금자체보다는 현행 저리로 운용되는 정책자금 금리가 개별수혜 중소기업 경영실적에 어떤 요인으로 인식되고 있는지에 대해 구체적이고 정량적인 분석을 통해 실제 효과 및 파급경로를 구조방정식모형(structural equation modeling)분석인 AMOS (Analysis of MOment Structure)기법을 활용해 분석하였다. 연구결과에 따르면 정책금리나 일반 중소기업대출금리 및 시장금리가 기업의 안정성 증대를 통해 수익성에 통계적으로 유의한 수준에서 긍정적영향을 미치고 있음을 확인하였다. 아울러 중소기업진흥공단의 정책금리는 안정성 증대를 통한 수익성향상 이외에도 기업의 활동성을 증대시키는 부가적 효과가 추가적으로 존재함이 증명되었다. 최근에 불거진 서브프라임 모기지 사태에 의한 세계적 금융위기 과정에서 심각한 자금경색을 겪고 있는 300백만중소기업을 위해 저금리 정부 정책자금의 추가적 공급은 일시적 자금문제를 극복하고 중소기업경쟁력 강화 및 침체된 내수경기 활성화에 중요한 처방이 될 수 있다. This research analyzes the fact that the interest rate of SME policy fund generally plays a pivotal role in enhancing individual SME s economic performances by doing systematic and quantitative tests with AMOS(Analysis of MOment Structure) in order to investigate direct effect and its processes. Especially, interest rate of SME policy fund, overall SME lending rate by commercial banks as well as financial market have favorable impact on recipients profitability ratio through the financial stability. However, low interest rate of SME policy fund additionally helps SME s activity ratio to increase comparing to other indexes. Recently, the financial crisis rooted in sub-prime mortgage problem, prevails all through the countries and gives the hardest time to 3 million Korean SMEs but liquidity shortage within Korean SMEs can be alleviated by maximizing the role of governmental SME policy funding with lower interest rate than financial market lending rate as we proved with the statistical significance. In this process, we suggest that low interest rate of SME policy fund results in financial stability and enhancement of activity ratio after providing governmental policy fund.