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빅데이터를 활용한 리츠 인식 변화 연구 - 공모 리츠 육성정책 시행 전후 비교를 중심으로 -
전태욱,김호철 한국부동산경영학회 2021 부동산경영 Vol.23 No.-
본 연구는 공모상장 리츠 활성화를 위해 투자자의 리츠에 대한 인식변화를 분석하는 데 목적이 있다. 이를 위해 2016년 3월 정부의 리츠 육성정책방안 공표 시점을 전후로 뉴스, 블로그, 카페 소셜데이터 경향성과 의미연결성 분석을 위해 텍스트 마이닝을 수행하였다. 부동산과 리츠 키워드로 검색한 결과, 정부정책 발표 이전인 1기에는 부동산과 리츠를 포 괄하는 회사, 펀드, 자산, 사업, 주택 등 공통키워드가 상위순위로 나타났으나, 정책발표 이 후인 2기에는 상장, 공모 등의 키워드가 뉴스를 중심으로 변화되었다. 반면, 블로그와 카페 는 공동커뮤니티인 특성상 시간흐름에 따라 큰 변화가 없었다. 의미연결성 분석결과, 뉴스 와 블로그에서 2기에 들어 리츠가 공모, 배당, 증권, 상장 등 키워드를 중심으로 연결성이 두드러지게 나타나 리츠에 대한 인식이 제고되고 있음을 확인하였다. 매체별 특성은 뉴스 의 전달력에 비해 블로그와 카페에서의 속성상 기존 부동산의 부정적 이미지가 리츠 인식 확산에 장애가 되고 있음도 알수 있었다. 본 분석결과는 투자자의 리츠에 접근 활성화와 건 전한 투자시장 토대 마련을 위한 정책적, 제도적 시사점을 제시하였다는 데 의의가 있다. The Purpose of this study is to analyze changes in investors' perception of REITs in order to activate public offering REITs. To this end, text mining was carried out to analyze news, blog, and Internet cafe social data trends and semantic connectivity around the time of the government's announcement of the REITs promotion policy in March 2016. As a result of searching with real estate and REITs keywords, common keywords including real estate and REITs were ranked high in the first period before the government policy announcement, but in the second period after the policy announcement, keywords such as listing and public offering were changed. On the other hand, blogs and Internet cafes have not changed much over time due to the nature of their joint communities. As a result of the semantic network analysis, it was confirmed that the REITs are highly connected with the keywords such as public offering, dividends, securities, and listing in the 2nd period on the news and the blogs and that the awareness of the REITs. Compared to the transmission power of news, the negative image of existing real estate on blogs and Internet cafes was also an obstacle to the spread of REITs awareness. The results of this analysis are meaningful in that they present policy and institutional implications for revitalizing investors' access to REITs and laying the foundation for a sound investment market.
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전태욱,박기문 한국축산식품학회 2002 한국축산식품학회지 Vol.22 No.3
The functional properties of egg shell membrane hydrolysate by Bacillus licheniformis(EESMH) and NaOH-ethanol(AESMH) as a food material were investigate.. The yield of egg shell membrane hydrolysate was about 15% by Bacillus licheniformis, whereas that was 70% by NaOH-ethanol. Histidine content was higher in EESMH (18.69%) than in AESMH (2.56%). Both EESMH and AESMH showed high protein solubility (>95%). Emulsifying activity and stability of EESMH were higher than those of AESMH. Foaming capacity and stability of AESMH were 2 times higher than those of EESMH in the pH ranges from 2 to 12. The AESMH had antioxidative activity whereas EESMH had not. Therefore, both AESMH and EESMH can be used for industrial food materials from the results of functional properties.
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참치백자로부터 추출한 Protamine 의 특성 및 항균활성
전태욱,김진호,박기문,Jeon, Tae-Woog,Kim, Jin-Ho,Park, Ki-Moon 한국식품과학회 1999 한국식품과학회지 Vol.31 No.2
참치 백자의 항균제호서의 사용 가능성 검토를 위하여 참치 백자의 특성 및 항균력 실험을 하였다. 아미노산 분석결과 arginine 함량은 약 46%로 연어 백자로부터 추출한 standard protamine (SP, Asama 화성, Japan)에 비해 약 10%가 낮았으며, proline및 glycine등 아미노산 조성에서도 큰 차이가 있었다. 주된 단백질의 평균 분자량은 SP가 11,300 Da과 2,600 Da이었으며, TP는 13,400 Da이었다. 그리고 SP와 TP의 항균활성 비교 실험에서 TP는 SP보다 약한 것으로 나타났다. 항균활성을 높이기 위해 $37^{\circ}C$에서 효소처리한 pepsine hydrolyzed protamine (PHP)과 trypsine hydrolyzed protamine (THP)의 주된 단백질의 평균 분자량은 PHP의 경우 11,300 Da과 3,900 Da으로 확인되었고, THP의 분자량은 2,500 Da 이하로 나타났다. PHP의 항균활성을 확인한 결과 TP보다 높은 항균력을 보였으며, 주된 단백질의 평균 분자량이 비슷한 SP와 유사하게 항균활성이 향상됨을 알 수 있었다. 그러나 gram (+)균인 Stap. aureus, L. helveticus, L. plantarum 등에서는 PHP가 SP보다 강한 항균활성을 보여 주었다. 그리고 분자량이 2,500 Da 이하인 THP의 경우 항균활성이 없는 것으로 밝혀졌다. 이와같이 PHP의 항균활성이 향상된 것은 protamine의 arginine의 함량이 증가하지 않더라도 주된 단백질의 평균 분자량이 변화되었기 때문으로 생각된다. 따라서 참치 백자로부터 추출한 TP를 pepsin처리했을 때 SP와 유사한 수준으로 항균활성 향상되는 것을 확인하였다. The purpose of this study was to investigate the antimicrobial effects and characteristics of protamine extracted from spermary of tuna. The result of amino acids analysis showed that the contents of arginine were 46%. It was 10% lower when compared to standard protamine (SP: Asama kasei LTD, Japan). Also, there were significant difference in the contents of proline adn glycine. The average molecular weights of main protein in TP were 13,400 Da, whereas those in SP were 11,300 Da and 2,600 Da. To increase antimicrobial activities of TP, pepsin or trypsin was treated at $37^{\circ}C$. After TP was hydrolyzed with pepsin (pepsin hydrolyzed protamine: PHP) for 4hrs, the average molecular weights of the main protein were 11,300 Da and 3,900 Da, and the antimicrobial activities were significantly increased compared to TP. After TP was hydrolyzed with trypsin (trypsin hydrolyzed protamine: THP) for more than 10 min, the average molecular weights of the main protein were below 2,500 Da. PHP had higher antimicrobial effects on some gram positive bacteria (Staphylococcus aureus, Lactobacillus helveticus, Lactobacillus plantarum) than SP. However, THP had no antimicrobial activities. When TP was hydrolyzed with pepsin (PHP), its antimicrobial activities increased in the same level with those of SP, and this increase might be resulted rather from the changes of molecular weights of the main protein than from the contents of arginine in protamine.
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낙각막 분해를 위한 Bacillus licheniformis로 부터 Keratinase의 정제 및 특성
전태욱,박기문 한국축산식품학회 2002 한국축산식품학회지 Vol.22 No.3
본 연구는 토양으로부터 egg shell membrane(ESM)을 분해하는 미생물 strain 109를 분리 동정하였으며, 분리균이 생성한 keratinase를 정제하고 그 특성을 확인하였다. Strain 109는 16S rDNA 결과 99.9%의 상동성을 가지고 Bacillus licheniformis로 확인되었고, 3% ESM을 함유한 Nitrobacter 203배지에서 B. licheniformis 109를 접종하여 1주일간 배양하였을 때 ESM의 분해율은 약 15%였다. E. licheniformis 109가 생성한 keratinase를 정제하여 SDS-PA-GE로 분자량을 측정한 결과 약 65,000 Dalton이었으며 0.1% gelatin이 함유된 SDS-PAGE에 의해 효소 활력을 확인할 수 있었다. 정제한 keratinase의 PH에 따른 활성과 안정성은 pH 9.0에서 활성이 가장 높았으며 pH 9.0이상에서 안정하였다. 또한, 5$0^{\circ}C$에서 효소활성이 가장 높았으며 온도 안정성은 2$0^{\circ}C$에서 5$0^{\circ}C$까지 안정하였고, 7$0^{\circ}C$ 이상에서는 약 50%의 활력을 상실하였다. keratinase 활성에 금속 이온이 미치는 영향은 CuCl2와 ZnCl2에 의해 약 50% 정도가 저해되었으나 FeSO4에 의해서는 1mM일 때 약 11%, 10mM일 때 약 33%가 증가하였다. 그리고 PMSF에 의해 효소활성이 저해되는 것으로 나타나 B. licheniformis 109로부터 정제한 keratinase는 serine-protease로 사료된다. The egg shell membrane degrading isolated from soil was identified as Bacillus licheniformis by 16S rDNA identification method. A keratinase was isolated from the Baciilu licheniformis culture. DEAE-cellulose ion-exchange and Sephadex C-75 gel chromatograhies were used to purify the enzyme. The specific activity was increased 17.3-fold by the purification procedures. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) analysis and Sephadex G-75 chromatography indicated that the purified keratinase was monomeric and had a molecular weight of 65 kDa. The enzyme showed optimum activity at pH 9.0, and was stable above pH 9.0. The optimum temperature was 50$\^{C}$ and the enzyme was stable in the temperature ranges from 20$\^{C}$ to 50t. By the addition of 1 mM and 10 mM FeSO4, the activities of the enzyme were increased to 111$\pm$4.6% and 133$\pm$3.79%, respectively. The keratinase was an alkaline serine pretense because it was inhibited only by phenylmethylsulfonylfluorice (PMSF).
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초고진공중에 있어서 Tribo-Coating 막의 윤활특성
김형자,加藤康司,전태욱 釜山工業大學校 1993 論文集 Vol.35 No.-
In order to find out the optimum conditions for the thickness of in film and the matrix of lubri-cation material and the surface roughness of material to chance lubricating life and low friction coe-fficient, the relationship between the surface roughness of material and the thickness of In film and their tribological behavior was investigated several soft metals in pin-on-disk tests under repeated rubbing conditions. Base in thought that lubrication for space machine is very important and go developing over the world, in this study we suggest new lubricating, that is tribo-coating, that is able to prove to be powerful that has minimum friction coefficient 0.02 over the world from selec-ting optimum matrix of lubrication material between friction surface.
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브라질 오피스 빌딩의 최적 투자기구(Vehicle)에 관한 연구
전태욱(Jeon, Tae Wook),유주연(Yoo, Joo Yeon),손재영(Son, Jae Young) 한국부동산학회 2012 不動産學報 Vol.51 No.-
1. CONTENTS (1) RESEARCH OBJECTIVES Brazilian office market offers one of the best investment opportunities in the mid-term future. However, little information flows among Korean real estate professionals. This paper intends to fill the gap by introducing various indirect investment vehicles accepted under the Brazilian law and comparing them with real world case. (2) RESEARCH METHOD Specifically, we consider three financial structures: indirect acquisition through FII (real estate investment funds), indirect acquisition through FIP (fund that invests in companies which are allowed to posses real estated properties), and direct acquisition through Limitada. The investment characteristics such as legal and tax issues are identifies and expected returns are calculated. (3) RESEARCH FINDINGS For the particular office building we are considering, we conclude that Limitada seems to be the best investment vehicle. 2. RESULTS The investment characteristics and expected return would mainly affect choosing the investment structures, and also legal and tax issues should be reviewed accurately either. Through this study, we hope investors can access to the real estate market in Brazil, for expanding real estate investment opportunities overseas.
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