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.

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.

未拂 河川敷地 補償制度 改善方案에 관한 硏究

정재호(Chung, Jae Ho),김형근(Kim, Hyeong Geun) 韓國不動産學會 2010 不動産學報 Vol.42 No.-

1. CONTENTS (1) RESEARCH OBJECTIVES The government amended the Special Measures Law on the compensation of land included in rivers on June 26, 2009, in which the land compensated by the Special Measures Law is defined as a land that falls in river areas of national rivers or the first local class rivers. The nation or local government are trying to actively solve this problem for unpaid river sites that were included in rivers, but have not yet been compensated. However, local rivers other than national rivers confront civil complaints because related compensations have been postponed due to the shortage of finances in local governments. First of all, there are some systematic problems for the land compensation of unpaid river sites even though there are various reasons under this circumstance. Therefore, this study desires to suggest reformations by figuring out compensation systems and for loss of unpaid river sites and their status including existing problems. (2) RESEARCH METHOD The time and spatial scope of this study on the reformation of compensation system for unpaid river sites is from 1971 to the present, and the object of this study is the unpaid river sites that were included in national and local rivers in Korea. For a methodology used in this study, we examined some cases that were compensated for unpaid river sites being compensated focusing on national rivers according to the 'construction project for main 4 rivers,' taking into account some cases compensated thanks to the amendment of the Law of Rivers and suggested a reformation for them. (3) RESEARCH FINDINGS The Law of Rivers in Korea acknowledges only a nation's buy-back right excluding a claim for recapture of unfair profits or 'a claim for damages' under the Civil Law according to the state-owned river system. National rivers are being claimed for purchase according to special laws of the Special Measures Law on the compensation of land included in rivers, but the land compensations for local rivers(including small rivers) are being postponed despite a lot of recent civil complaints because local governments should compensate for them by local finances. While the percentage of rivers managed by the nation is 90%, that of rivers managed by the Korean government is less than 10%. Considering that private lands are being included in local rivers due to natural disasters such as floods in summer in Korea, special measures for compensation of the land included from local and small rivers are required at this point. However, more systematic compensation measures should be taken for local and small rivers at the time when the compensation for national rivers are nearly being completed. 2. RESULTS First, we need a reformation to extend a nation's buy-back right for river sites by upgrading local rivers into national rivers. Especially, the fact that a lot of lands are being included mainly in local and small rivers mostly in summer is full of suggestions. Under this circumstance, small rivers should be expanded into local rivers, and local rivers should be expanded national rivers, and thus, they should be compensated for loss according to the special laws. Second, the finances for the compensation of unpaid sites in local rivers should be expanded. Namely, related laws and regulation should be reviewed in order that the compensation for loss can be made by giving rent profits of the land owned by the nation as finances for local governments. Third, the system for active compensation of loss should be arranged by newly establishing departments that are exclusively in charge of the enactment of ordinance for compensation of unpaid river sites and the performance of compensation. Fourth, systematic compensations should be performed by using data through researches on the actual condition of unpaid river sites.

항력감소를 위한 2차원 환기 초공동 현상의 실험 연구

정재호(Jaeho Chung),조연우(Yeunwoo Cho) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11

This experimental study examines ventilated supercavity formation in a free-surface bounded environment where a body is in motion and the fluid is at rest. The shape of the object is a two-dimensional flat plate, and a straight cavitator is attached to the lower part of the object, and compressed air is blown out behind the cavitator. Two-dimensional supercavitation phenomenon was observed and the associated drag was measured. We found that the drag force was reduced by up to 40%.

수중 운동체 주변에 형성되는 환기 초공동(ventilated supercavitation) 현상 가시화

정재호(Jaeho Chung),조연우(Yeunwoo Cho) 한국가시화정보학회 2015 한국가시화정보학회지 Vol.13 No.1

A laboratory experiment was carried out to observe and visualize ventilated supercavitation phenomena around a moving underwater body which is attached to a newly designed high-speed (Max. 20 m/s) carriage system in a wave tank. Compared to the existing many other experimental studies using cavitation tunnels, where the body is at rest and the fluid is in motion in a bounded or closed environment, the present experimental study deals with super-cavity formation in unbounded or free-surface bounded environments, where the body is in motion and the fluid is at rest. Main attention is paid to the effective visualization of the steady-state cavity formations around a moving body and, those cavity formations are reported pictorially according to the body speed, ventilated air-pressure, and with or without a cavitator.

제한적 합리성 하에서 경품 당첨 경합에서의 설득에 관한 연구

정재호(Jaeho Chung),박민수(Minsoo Park) 사이버커뮤니케이션학회 2019 사이버 커뮤니케이션 학보 Vol.36 No.2

본 논문은 네이버 공연전시 초대권 이벤트 자료를 이용해 전략적 행위 및 언어적⋅비언어적 설득행위를 통한 경합(tournament)을 실증적으로 분석한 연구이다. 참여자들은 당첨을 위해 자신의 댓글에 대한 공감 및 타인의 댓글에 대한 비공감을 전략적으로 선택할 수 있는데, 그 결과인 ‘베스트댓글’ 선정여부는 당첨에 유의하게 긍정적인 영향을 미치는 것으로 나타났다. 또 공감이 많이 달릴수록, 비공감이 적게 달릴수록 댓글이 당첨될 확률이 유의하게 높아졌다. 이는 게시판 이용자들과 당첨 선정자의 제한적 합리성 또는 이타적 행위의 결과로 해석할 수 있다. 언어적 설득 변수에 대해서 살펴보면, 보다 긴 댓글일수록 당첨 확률이 높게 나타났는데 이는 경품에 당첨되기 위해서 참여자들이 들인 노력이 호의적으로 평가된 결과라 할 수 있다. 공연⋅전시의 동반자를 드러내는 가족, 부부, 친구 단어군, 신청자의 지위를 나타내는 직장인 단어군의 영향은 유의하게 나타났다. 진위여부를 확인할 수 없는 기념일 단어군의 경우 당첨에 미치는 영향이 유의하지 않았고, SNS를 통한 간접 광고를 제안할 경우 당첨확률이 높게 나타났다. 비언어적 설득 변수로서 댓글 순서의 영향을 살펴보면, 이벤트에 참여한 순서가 빠를수록 당첨 확률이 높게 나타났다. This study empirically analyzes participants’ behavior in a contest by persuasion by using data on the performance/exhibition invitation contests hosted by Naver, the largest web portal in Korea. In the contest, participants write the reason why they want to go to the performance/exhibition as a comment and hosts pick a limited number of comments and offer free tickets. Some of the comments become “Best Comment” which appear in the first page of comments when they earn “Like” fairly more than “Dislike”. Participants for the events can give “Like” or “Dislike” to the other participants’ comments, therefore they can use Like/Dislike strategically. We investigate what are the attributes of the comments (persuasion) that determine the probability of winning. The results of estimation show that becoming a “Best Comment” could be effective in persuasive competition. We also found that words categorized as a “family”, “married couple”, “friend”, “worker”, “social media” increase the probability of being selected while the effects of “anniversary” related words are not significant. The order of reply is another effective route of persuasion. We interpret the results in a context of contest under bounded rationality and uncertainty.

수중 운동체 주변에 형성되는 환기 초공동(ventilated supercavitation) 현상 가시화

정재호(Jaeho Chung),조연우(Yeunwoo Cho) 한국가시화정보학회 2015 한국가시화정보학회 학술발표대회 논문집 Vol.2015 No.5

건설경제산업연구 : 교통 soc 분야별 적정 투자규모

정재호 ( Jae Ho Chung ),조수희 ( Soo Hee Cho ) 한국건설경제산업학회 2011 건설경제산업연구 Vol.2 No.2

정부는 국가 물류비 절감과 경제 활성화를 위해 1990년대 이후 교통시설 등 soc 시설에 대한 재정투자를 지속적으로 확대하였다가 2003년 이후 soc 예산을 축소하였다2009년과 2010년에 일시적으로 soc 재정투자 증가에도 불구하고 국가재정 투자에서 soc 분야, 특히 교통 분야의 soc 재정투자는 지속적으로 감 소 추세이다. 본 연구는 soc 투자규모와 정부의 투자 방향 논란 가운데 투자의 적정성을 찾기 위한 목적을 가지고 있다. 기존 연구는 주로 교통 sac 투자 현황과 추이를 파악하고 도로와 철도연장 등 물리적 단위의 실물단위를 주요국과 국제 비교함으로써 우리나라의 교통 SOC 투자의 적정규모를 파악하거나 경제모형을 통해 sac 의 적정성을 분석하였다. 본 연구는 sac 물리적 규모의 국제간 비교와 경제모형으로 측정하는 두 가지 연구 방법을 채택하고 교통 soc 스톡(물리적) 규모 GDP 대비 교통 soc 투자비율, 분야별 교통 soc 투자 비중, 교통 soc 순자산 스톡(경제적) 규모의 4가지 기준으로 OECD, ITF, World Bank, IMD 등의 최근 국제 자료를 수집하여 원 데이터 활용 및 가공한 데이터를 사용하였다. 최근 교통 soc의 종합 연구 및 정부의 soc 투자 관련 정책 수립을 위한 참고자료로 활용 가능할 것으로 여겨진다. 연구 결과, 교통 soc 투자 수준의 비교에 물리적 스톡 또는 경제적 스톡, soc 대비 비율 등 어떤 기준을 선택하느냐에 따라 교통 soc 확대와 축소를 선택할 수 있다는 한계를 보여주었다 정부는 사회경제적, 지리· 환경적, 정치적 여건 등 다면적이고 종합적인 추가 검토와 구체적인 부문별 효율성 분석을 통해 우리나라 실 정에 맞는 교통 soc 적정 규모의 투자가 이루어져야 할 것이다. 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.

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.

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.