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.

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.

다중 사용자 MIMO 채널 환경에서 셀 용량을 증가 시키는 사용자 선택 기법

정재호(Jaeho Chung),최승원(Seung-won Choi) 한국통신학회 2011 韓國通信學會論文誌 Vol.36 No.1

본 논문에서는 하향링크 다중 사용자 Multiple Input Multiple Output (MIMO)채널 환경에서 셀 용량을 증가시키기 위한 Zero Forcing 기반의 효율적 사용자 선택 기법을 제안한다. 이 기법에서는 채널 전력이 미리 결정된 한계점을 초과하는 사용자들을 주요 그룹으로 구성한다. 100명의 사용자와 4개의 기지국 안테나를 가정한 컴퓨터 모의실험을 통해서 제안된 기법이 기존 기법보다 0.33 bps/Hz만큼 셀 용량을 추가로 제공할 수 있음이 밝혀졌다. This paper proposes an efficient user selection algorithm that provides a maximum 셀 용량 based Multi-user MIMO system based on zero-forcing criterion. The proposed scheme forms a primary group of users whose channel power exceeds a predetermined threshold. Through computer simulations, we have found that the proposed method outperforms the conventional scheme yielding a sum rate that is 0.33 bps/㎐ higher when the total numbers of users and transmit antennas in the cell are 100 and 4, respectively.

중국 산동성내 낙후지역과 발전지역의 정치경제: 청도와 요성의 비교

정재호(Jae Ho Chung) 한양대학교 아태지역연구센터 1999 중소연구 Vol.23 No.1

코로나19 이후의 세계변화 전망

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

미-중 관계의 진화(進化): '전략적 경쟁' 단계로의 진입?

정재호(Jea Ho Chung) 한양대학교 아태지역연구센터 2014 중소연구 Vol.37 No.4

US-China relations has no doubt become the most crucial variable affecting the Korean Peninsula and South in particular. This study seeks to analyze Sino-American relations from three distinct time-frames - namely, thirty-odd years of the post-Mao reform era, trends in the past 4-5 years, and the year of 2013. The study concludes that, from a mid- to long-term perspective, US-China relations are likely to be comprised of three manifestations: cooperative bilateral relations, strategic competition based on China`s evolving intentions, and strategic confrontation based on the dwindling room for America`s maneuvering. This conclusion dictates the Koreans to get out of their conventional boxed thinking in their long-term strategic planning, as well as to secure a wide base of support for their“national interests” more concretely defined.

한국에서의 중국정치 연구의 재 고찰

정재호(Jae Ho Chung),안치영(Chi-young Ahn),박만준(Man-joon Park),장윤미(Yoon-mi Chang),차창훈(Changhoon Cha),박병광(Byung-kwang Park) 한국국제정치학회 2005 國際政治論叢 Vol.45 No.2

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

〈청산별곡〉의 새로운 이해 모색

정재호(Chung Chae-Ho) 국어국문학회 2005 국어국문학 Vol.- No.139

〈Chungsanbyolgok〉 presumed to be formed in the end of Koryo dynasty is said to be one of the best of Koryo poetry and has already been studied in many ways. However the establishment of accepted theory supported by the academic world has not been made even though there are many arguments about the themes and structures.<br/> Above all, there could be four different parts of the themes that have been argued.<br/> First, 〈Chungsanbyolgok〉 is connected with the society considered to form the poetry. It means the 〈Chungsanbyolgok〉 is a song reflected the painful lives of serfs who had suffered from the disturbance of musins(military officials) and the invasion of Mongo.<br/> Second, 〈Chungsanbyolgok〉 is the expression of personal emotion. It shows perception of the theme in poetry as the pain of the broken heart.<br/> Third, 〈Chungsanbyolgok〉 is considered to connect with its structure. It means the grasp of the theme by examining the first stanza of 〈Chungsanbyolgok〉 consisted of eight stanzas which shows the expression of seeking Chungsan the Utopia and living there and the last stanza(the 8th stanza) about drunkenness.<br/> Fourth, It is the search of the theme in 〈Chungsanbyolgok〉 by using new methods. there has been changing viewpoints from bibliography and literature to the science of religion, mythology, shamanism, and drama in search of the theme of 〈Chungsanbyolgok〉.<br/> The reasons such themes seem to come out from are free interpretation due to the absence of historical records pertaining to 〈Chungsanbyolgok〉, different understanding of abstract words, no reveal about its formation in the content of 〈Chungsanbyolgok〉, personal viewpoints and methodolgy and the different way of recognizing the structure of 〈Chungsanbyolgok〉.<br/> However, The bases of these themes are not from the historical records but from the guessworks of researchers. In addition, there are very few including the themes of eight stanzas.<br/> Next, It is examined the present situation of the study on the structure of 〈Chungsanbyolgok〉. Many arguments about the structure have been mainly consisted of the systematic relations of 8 stanzas in 〈Chungsanbyolgok〉 or the collections of independent themes in each stanza.<br/> After concretely being examined the theme of each stanza in 〈Chungsanbyolgok〉 it is clear that each stanza has its own independent theme showing the bitters of life such as worry, solitude, misfortune, yearning for Utopia with the mind of living in Chungsan or by the sea, special experiences such as listening to the performance of Haegeum (musical instrument) or being drunk and something related to occupation.<br/> It has been studied hard the connection the time 〈Chungsanbyolgok〉 was made with Chungsanbyolgok to understand the work. However the result of efforts has raised doubts because of no historical basis but inference about the connection. It is desirable to argue the historical research on the basis of reliable data.<br/> Finally, It is argued that 〈Chungsanbyolgok〉 has to be studied actively in the more positive point of view considering the interest of 〈Chungsanbyolgok〉 not only by the people living Koryo but by current people.