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CreditGrades모형에 기반한 국가신용부도스왑 차익거래 전략의 쉬익륭과 위험에 관한 연구
이태균 ( Tae Kyun Lee ),김정무 ( Jung Mu Kim ) 한국경제통상학회 2014 경제연구 Vol.32 No.2
This paper constructs an arbitrage strategy using a long-run relation between CDS and stock markets and then analyzes the risk and return of the strategy. We apply CreditGrades model, a variant of Merton model, to sovereign risk and derive the relation between the sovereign CDS market and the stock market. Based on this model, we design a strategy which creates a profit if there are short-term gaps between CDS and stock markets. Plus, we empirically analyze the risk and return when we implement the strategy in ten countries`` market around the world. As a result, the main findings are as follows. First, we historically verify that there exists a long-run relation between CDS spreads and stock indexes. Second, we find attractive Sharpe ratios when applying this strategy to 10 countries. Especially, such attractive Sharpe ratios are noticeable after the financial crisis. Finally, we also find low correlation between returns from the strategy we suggest and those from traditional assets such as stocks and bonds. Consequently, we conclude that the strategy we examine is valuable for investors to diversify their portfolio risks.
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${\ll}$부인대전량방(婦人大全良方)${\gg}$ 에 관한 연구
오수석,이태균,김동일,Oh, Soo-Seock,Lee, Tae-Kyun,Kim, Dong-Il 대한한방부인과학회 2002 大韓韓方婦人科學會誌 Vol.15 No.4
Buin-daejeon-yangbang is one of the special book on the traditional eastern medicine(T.E.M) Ob&Gy in Song dynasty. It remains very important book of the department of the Ob&Gy in today's T.E.M. There are a good deal of the useful theories and prescriptions about clinical Ob&Gy in it. Chen-zi-ming(陳子明) was a very famous Ob&Gy doctor and professor on T.E.M who came from Lincuan Jingxi(江西 臨川) province China in the South-Song dynasty. He was born in AD 1190, was died in AD 1270. Buin-daejeon-yangbang was written by him in AD 1237 and remained several kinds of edition now. It takes form total 8 volumes, 24 chapters. There are more than 260 medical references and 1500 prescriptions in it. And the formation of the book which the arrangement of theories and prescriptions is to keep in order. But it has some unreasonable and superstitious contents too. It performed as a bridge which link the results of pre-Song dynasty about clinical T.E.M Ob&Gy and after-Song dynasty about that. So it is a grandfather of a book for about clinical T.E.M Ob&Gy as following books like Gyoju-Buin-daejeon-yangbang, Yeougwa-Jeungchi-Junsung and Jeieum-Gangmock.
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양정민,이태균,김동일,Yang, Jeong-Min,Lee, Tae-Kyun,Kim, Dong-Il The Society of Korean Medicine Obstetrics and Gyne 2007 大韓韓方婦人科學會誌 Vol.20 No.4
Purpose: 이 실험은 골다공증의 치료약물로 자하거의 골질재흡수 억제효과를 검토하기 위하여 설계되었다. Methods: 자하거의 골질재흡수 효과를 확인하기 위하여 생쥐의 두개골 골모세포를 이용하여 Cyclooxygenase-1(COX-1), COX-2, $TGF-{\beta}$, $L-1{\beta}$, $TNF-{\alpha}$, IL-6, prostaglandin E2등의 활성화 정도를 측정하였으며, 골조직의 미세구조적 변화를 확인하였다. Results: 자하거는 $IL-1{\beta}$, $TNF-{\alpha}$, IL-6 또는 그 세가지의 조합에 의하여 유발된 PGE2의 생성 뿐만 아니라 COX-2 mRNA 수치도 감소시켰으나 COX-1 mRNA 수치에는 영향을 주지 않았다. 이로써 자하거는 시험관내에서 그리고 생체내에서 펩티드의 인산화를 억제함으로써 골의 재흡수를 저해하였다. 그리고 자하거는 생쥐에서 $IL-1{\beta}$에 의해 유발된 고칼슘혈증을 감소시켰고, 골의 재흡수를 저해하는 경로를 통하여 골에 대한 보호효과를 보여줌으로써 조기에 난소 절제한 쥐에서 골질감소와 미세구조적 변화를 부분적으로 방지하였다. 이러한 결과는 PGE2 생성에 대한 $IL-1{\beta}$, $TNF-{\alpha}$, IL-6사이의 상승효과는 COX-2의 유전자 발현이 증가한 결과이며 이러한 tyrosine kinase가 생쥐의 두개골 골모세포에서 COX-2의 신호전달에 관계한다는 것을 보여준다. Conclusion: 자하거가 생쥐의 두개골 골모세포에서 여러 신호전달물질의 활성화를 통하여 골질재흡수를 저해하는 특성을 확인함으로써 앞으로 골다공증의 예방과 치료에 대한 추가적인 임상연구가 필요할 것으로 사료된다.
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Octamethylcyclotetrasiloxane를 이용한 광섬유 클래드 프리폼 형성
최진석,이태균,박성규,이가형,전구식,안성진,Choi, Jinseok,Lee, Tae Kyun,Park, Seong Gyu,Lee, Ga Hyoung,Jun, Gu Sik,An, Sung Jin 한국재료학회 2018 한국재료학회지 Vol.28 No.1
There are various manufacturing processes for pure $SiO_2$ that is used as abrasives, chemicals, filters, and glasses, and in metallurgy and optical industries. In the optical fiber industry, to produce $SiO_2$ preform, $SiCl_4$ is utilized as a raw material. However, the combustion reaction of $SiCl_4$ has caused critical environmental issues, such as ozone deficiency by chlorine compounds, the greenhouse effect by carbon dioxide and corrosive gas such as hydrochloric acid. Thus, finding an alternative source that does not have those environmental issues is important for the future. Octamethylcyclotetrasiloxane (OMCTS or D4) as a chlorine free source is recently promising candidate for the $SiO_2$ preform formation. In this study, we first conducted a vaporizer design to vaporize the OMCTS. The vaporizer for the OMCTS vaporization was produced on the basis of the results of the vaporizer design. The size of the primary particle of the $SiO_2$ formed by OMCTS was less than 100 nm. X-ray diffraction patterns of the $SiO_2$ indicated an amorphous phase. Fourier-transform infrared spectroscopy analysis revealed the Si-O-Si bond without the -OH group.
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업무용 SNS 스트레스가 사용자저항을 통해 SNS 자기노출에 미치는 영향
남은우 ( Eun-woo Nam ),이태균 ( Tae-kyun Lee ),서영욱 ( Young-wook Seo ) 사회혁신기업연구원 2021 혁신기업연구 Vol.6 No.3
정보통신기술의 눈부신 발전으로 개인간의 의사소통시 공간과 시간적 제약을 덜 받는 SNS(Social Network Service)가 확대되고 있다. COVID19 팬데믹 위기 이후로 기업은 온라인에서 적시에 의사소통을 하기 위하여 업무용 SNS의 사용을 점차 확대하고 있다. 업무용 SNS는 기업 조직 구성원간의 의사소통 뿐만 아니라 외부 파트너 또는 고객들과의 제품 및 서비스에 대한 의견을 교환하기 위한 목적으로 사용이 증대되고 있다. 본 연구에서는 기업의 업무용 SNS 정보과부하와 상호작용부담이라는 변수로 구성된 업무용 SNS 스트레스가 침해, 프라이버시염려와 사용자저항을 통해 자기노출에 미치는 영향을 연구하고자 한다. 실증 연구를 위해 일반기업에서 업무용 SNS를 사용하고 있는 직장인을 대상으로 416부를 설문한 결과 400개의 유효한 응답에 대하여 SPSS 26.0과 Smart PLS 3.0으로 분석하였다. 분석결과, 첫째, 업무용 SNS상에서의 정보과부하와 상호작용부담은 침해에 유의한 영향을 미치는 것으로 나타났으나 정보과부하는 사용자저항에 유의한 영향을 미치지 않는 것으로 나타났다. 둘째, 업무용 SNS상에서의 상호작용부담은 사용자저항에 유의한 영향을 미치며 침해와 프라이버시염려 또한 사용자저항에 유의한 영향을 미치는 것으로 나타났다. 셋째, SNS 프라이버시염려가 SNS 사용자저항에 따른 SNS 자기노출감소를 강화한다는 것도 확인되었다. 이상에서 기술한 업무용 SNS 스트레스가 SNS 침해와 사용자저항을 통하여 자기노출에 미치는 영향에 대한 실증분석을 실시함으로써 이론적, 실무적 시사점을 도출하고 기업의 업무용 SNS 이해관계자들과 후속 연구자들에게 실질적인 도움을 주고자 한다. With the remarkable development of information and communication technology, social network services (SNS), which are less restricted in space and time when communicating between individuals, are expanding. Since the COVID-19 Pandemic crisis, companies have gradually expanded their use of corporate SNS to communicate in a timely manner online. Corporate SNS is increasingly used for the purpose of exchanging opinions on products and services with external partners or customers as well as communication between members of corporate organizations. This study aims to study the effect of corporate SNS stress consisting of variables such as corporate SNS information overload and interaction burden on self-exposure through invasion, privacy concerns and user resistance. As a result of a survey of 416 copies of office workers using corporate SNS in general companies for empirical research, 400 valid responses were analyzed as SPSS 26.0 and Smart PLS 3.0. As a result of the analysis, first, it was found that information overload and interaction burden on business SNS had a significant effect on invasion, but information overload did not significantly affect user resistance. Second, it was found that the burden of interaction on business SNS had a significant effect on user resistance, and invasion and privacy concerns also had a significant effect on user resistance. Third, it was also confirmed that SNS privacy concerns strengthen SNS self-exposure reduction due to SNS user resistance. By conducting an empirical analysis of the effect of corporate SNS stress described above on self-exposure through SNS invasion and user resistance, we intend to derive theoretical and practical implications and provide practical help to corporate work SNS stakeholders and follow-up researchers.
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이동녕,문진영,오규석,이태균,최미정,이동목,남경수,Lee, Dong-Nyung,Moon, Jin-Young,Oh, Gue-Suc,Lee, Tae-Kyun,Choi, Mi-Jung,Lee, Dong-Mok,Nam, Kyung-Soo 한국생약학회 1997 생약학회지 Vol.28 No.3
Antaeum(ATE) has been used as a prescription for threatened abortion, associated with pregnancy in traditional medicine. Because gravida could be administered ATE for a long period, its administration might cause a harmful effect on fetus and gravida during the pregnancy. This study aimed to determine whether exposure to ATE caused mutagenicity or hepatotoxicity during the pregnant period. For mutagenicity test of ATE, Salmonella typhimurium and Bacillus subtilis were used as indications for DNA damage. In the Ames test, Samonella typhimurium TA98 and TA100 were used for mutagenicity testing, and the number of histidine revertants was measured. In Rec-assay, Bacillus subtilis H $17(Rec^+)$ and $M-45(Rec^-)$ strains were used to clarify the DNA damage property. In the SOS umu test, Salmonella typhimurium TA15335 containing plasmid pSK1002 was used as a tester strain, and we monitored the levels of umu operon expression by measuring the ${\beta}-galactosidase$ activity. From the tested results, ATE did not show DNA damage and mutagenicity. On the other hand, hepatotoxicity of ATE to female ICR mice was monitored by the measurements of s-GOT, s-GPT and LDH activities after oral feeding for 15 days. ATE did not show significant change of s-GOT, s-GPT and LDH activities in mice sera.
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