Cover story

김규형,Kim, Gyu-Hyeong 한국과학기술단체총연합회 2003 과학과 기술 Vol.36 No.5

"어릴 적 꿈 천직으로 이어져 행복"/"'매력없는' 기초과학이 우리 미래를 밝힙니다"

VaR(Value at Risk)의 응용에 관한 연구

김규형 중앙대학교 산업경영연구소 1999 산업경영연구 Vol.8 No.1

본고는 포트폴리오에 적용되는 VaR Delta라는 개념을 개발하고 이를 이용하여 Component VaR 와 Incremental VaR를 정의한다. Component VaR는 포트폴리오를 구성하는 각원소가 전체의 VaR에서 차지하는 비중을 구하는데 사용하고 Incremental VaR는 새로운 자산의 추가여부를 결정할때 사용한다. 그러나 추가여부를 결정할 때도 새로운 자산의 규모가 기존의 포트폴리오의 크기에 비하여 아주 작을 때는 Component VaR가 Incemental VaR의 Taylor 확장에서 2계이상의 항이 무시되는 근사치라는 점에서 Component VaR를 Incremental VaR의 대용변수로 사용하여도 무방하다는 것을 보인다. 또한 동이란 크기의 Incremental VaR를 가진 새로운 자산의 추가여부를 결정할때는 보다 상대적인 VaR의 크기를 이용하는 것이 바람직한 것을 보인다. The VaR Delta concept is developed to provide a basis to define Component VaR and Incremental VaR. Component VaR is supposed to be used to divide the total VaR into additive components, while Incremental VaR is to be used when evaluating relative performance of candidate portfolios. It is shown that Component VaR can be used when evaluating relative performance of candidate portfolios because Component VaR is a second order approximation of Incremental VaR. However it is recommended that the Component VaR is used only when the candidate portfolios are small when compared to the existing portfolio as the component VaR ignores higher terms in the Taylor expansion.

Export Destination and the Impact of Exchange Rate Volatility on Trade Volume: Korean Experience

김규형 한국무역학회 2014 Journal of Korea trade Vol.18 No.4

This paper investigates how differently won/dollar real exchange rate impactsthe export volume to the world and to the U.S. for the four Korean exportindustries. Using monthly data of Korean exports to the world and to the U.S. from 2000:01 to 2014:06, and a bivariate GARCH estimator with corrections forleptokurtic errors, the paper shows that won/dollar real exchange rate volatilityhas positive and significant impact on Korean heavyweight industry’s export tothe world, while won/dollar real exchange rate volatility has negative and insignificantimpact on Korean heavyweight industry’s export to the U.S.. The impactof won/dollar on the other three industries (food, material, lightweight) is notsignificant for both markets. This finding implies that whether the claim that exchangerate volatility impacts trade volume negatively or not depends on the destinationof the export, where the relative competitiveness of the Korean export industryis revealed. Won/dollar real exchange rate volatility has positive and significantimpact on the volatility of heavyweight industry’s export to the world,which may imply possible positive and accelerating effect to the export to theworld with favorable won/dollar movement, reflecting heavyweight industry’sstrong competitiveness in the world market. However the positive and significantvolatility impact of won/dollar real exchange rate volatility on heavyweight andlightweight industries’ export to the U.S. may imply possible negative and insignificanteffect with favorable won/dollar movement, reflecting weak competivenessof the two Korean industries in the U.S. market. This paper investigates how differently won/dollar real exchange rate impacts the export volume to the world and to the U.S. for the four Korean export industries. Using monthly data of Korean exports to the world and to the U.S. from 2000:01 to 2014:06, and a bivariate GARCH estimator with corrections for leptokurtic errors, the paper shows that won/dollar real exchange rate volatility has positive and significant impact on Korean heavyweight industry’s export to the world, while won/dollar real exchange rate volatility has negative and insignificant impact on Korean heavyweight industry’s export to the U.S.. The impact of won/dollar on the other three industries (food, material, lightweight) is not significant for both markets. This finding implies that whether the claim that exchange rate volatility impacts trade volume negatively or not depends on the destination of the export, where the relative competitiveness of the Korean export industryis revealed. Won/dollar real exchange rate volatility has positive and significant impact on the volatility of heavyweight industry’s export to the world, which may imply possible positive and accelerating effect to the export to the world with favorable won/dollar movement, reflecting heavyweight industry’s strong competitiveness in the world market. However the positive and significant volatility impact of won/dollar real exchange rate volatility on heavyweight and lightweight industries’ export to the U.S. may imply possible negative and insignificant effect with favorable won/dollar movement, reflecting weak competiveness of the two Korean industries in the U.S. market.

가압기 밀림관 벤딩반경에 따른 구조하중 분석

김규형,김태순,김성환,강선예 한국에너지학회 2013 한국에너지공학회 학술발표회 Vol.2013 No.11

고주파 마그네트론 Sputtering에 의해 상온에서 성막된 ITO, IZO, IZTO 박막들의 전기적ㆍ광학적 특성 비교

김규형,박승환,김종재,김화민 한국물리학회 2003 새물리 Vol.46 No.4

Various transparent conducting oxide (TCO) films such as ITO (In$_2$O$_3$-SnO$_2$), IZO (In$_2$O$_3$-ZnO) and IZTO (In$_2$O$_3$-ZnO-SnO$_2$) films were prepared on glass substrates at room temperature in a pure Ar gas by using rf--magnetron sputtering. Their electrical sheet resistances as functions of the film thickness and their optical properties were investigated. IZO and IZTO are more suitable for TCO films than ITO in several respects, such as electrical conductivity, resistance to moist heat and surface uniformity. In particular, IZTO (In$_2$O$_3$ : ZnO : SnO$_2$ = 90 : 7 : 3 wt.\%) films show a minimum resistivity of 3.2 $\times$ 10$^{-4}$ $\Omega \cdot$cm and have a most excellent resistance to moist heat. In addition, the increase in sheet resistance of TCO films due to moist heat has been reported to be closely related to changes in their structure and surface morphology. 고주파 마그네트론 sputtering을 사용하여 ITO (In$_2$O$_3$-SnO$_2$), IZO (In$_2$O$_3$-ZnO) 그리고 IZTO (In$_2$O$_3$-ZnO-SnO$_2$)와 같은 여러 TCO 박막 (transparent and conductive oxide film)들이 상온에서 성막되었으며, 이들의 전기적, 광학적 특성이 조사되었다. 상온에서 성막할 수 있는 TCO 물질로는 전기전도도, 습열에 대한 저항력 그리고 표면조도와 같은 성질들에 있어서, IZO 와 IZTO 가 ITO보다 더 우수함을 보여준다. 특히, IZTO (In$_2$O$_3$ : ZnO : SnO$_2$ = 90 : 7 : 3 wt.\%) 박막으로부터, 3.2 $\times$ 10$^{-4}$ $\Omega \cdot$ cm 의 가장 낮은 비저항이 얻어졌으며, 이 박막은 습열 (moist heat)에 대한 저항력 또한 가장 우수한 것으로 나타났다. 그리고 습열에 의한 TCO 박막들의 면 저항 증가는 각 박막들의 구조 또는 표면 형상 (morphology) 변화와 밀접한 관계가 있음을 보여준다.

영상 번역에 나타나는 러시아 관용어 번역연구 - 넷플릭스 ‘국민의 일꾼 더 무비’를 중심으로

김규형 한국외국어대학교 통번역연구소 2023 통번역학연구 Vol.27 No.1

Since the outbreak of COVID-19 in 2019, people have engaged more in indoor activities than outdoor activities. Accordingly, the demand for video content, especially for those on the OTT platforms has also grown. Furthermore, along with video content in English, the demand for content created in other languages has also grown rapidly with the audience making efforts to appreciate and understand the work beyond the ‘1-inch-tall barrier of subtitles.’ In such video content, we often encounter idioms that we use quite frequently in our daily lives. It is difficult to understand idioms by trying to comprehend the meanings of each word. Because idioms contain the culture, history, and customs of a nation, translating idioms is not an easy task. This study examines Russian idioms appearing in Servant of the People provided by Netflix, starring the current Ukrainian President Volodymyr Zelensky, which were classified according to Komissarov's four phraseology translation strategies. The study found that corresponding phraseologies and generalization strategies were highly utilized in similar proportion. Borrowing strategy appeared only twice and equivalent phraseology did not appear. In addition, Russian, English, and Korean subtitles were compared as Netflix has a policy of translating languages through its intermediate language, English. It was found that the similarity between English and Korean was slightly less than that between Russian and English. Nevertheless, it cannot be concluded that translations were done through English which was the pivot language. With more video content in languages other than English produced and demand growing, it is necessary to heighten the interest of viewers by fostering professional video translators while avoiding translating through an intermediate language if we are to transcend the '1-inch-tall barrier' into '1-inch-tall art.'

Synthesis of positively charged polystyrene nanospheres by using poly (N-vinylpyrrolidone with various molecular weight as polymeric surfactant

김규형,이원목 한국고분자학회 2014 한국고분자학회 학술대회 연구논문 초록집 Vol.2014 No.10

한국 주식시장에서의 Piotroski의 FSCORE와 Mohanram의 GSCORE를 활용한 패자추종 실시간 포트폴리오 전략의 비교에 관한 연구

김규형,임창우,정태규 성균관대학교 경영연구소 2018 자산운용연구 Vol.6 No.1

We applied Piotroski’s FSCORE (2000) to select value stocks as portfolio components. We subdivided the value stock portfolio into buying group and selling group, and then we applied various loser following on-line portfolio strategies. In the process, we decided what to buy and what to sell(short selling) on daily basis. We found RMR strategy and OLMAR strategy are the best performers, while CWMR and PAMR strategies are less successful. This may imply that the value stocks have mean reverting or trending properties. For the comparison, we applied Mohanram 's GSCORE to select the growth stocks and followed the same process as we did for the Piotroski’s FSCORE. We found that every loser following on-line portfolio strategy that we applied did not outperform market returns in the final cumulative return. This seems to imply that the random walking property is dominant in the growth stock portfolio. 가치주 집단에 대해서 Piotroski(2000)의 FSCORE 를 적용하여 매수주집단과 매도주집단을 구분해 내고 이들에 대해서 여러 가지 패자추종 실시간 포트폴리오 전략을 적용한 결과 RMR전략과 OLMAR전략이 여러 가지 지표에 비추어 볼 때 가장 좋은 성과를 보였다. 반면에 CWMR과 PAMR를 이용한 포트폴리오 전략은 RMR과 OLMAR보다 누적수익률이 상대적으로 낮았다. 이는 가치주의 경우에는 기계학습으로 그 패턴을 추정해 낼 수 있는 평균회귀과정이나 추세과정을 따르기 때문으로 보인다. 성장주집단에 대해서 Mohanram의 GSCORE를 적용하여 매수주집단과 매도주집단을 구분해내고 이들에 대해서 여러 가지 패자추종 실시간 포트폴리오 전략을 실행하였다. 그 결과 어떤 패자추종 전략도 최종 누적수익률에서 시장 수익률을 이기지 못하였다. 이는 성장주의 경우에는 기계학습으로는 그 패턴을 추정해낼 수 없는 임의 보행과정을 따르기 때문으로 보인다.

BMP-2 Derived Peptide Modified Polymer on Titanium for Dental lmplant Application

김규형,강은정,김효섭,강원석,김진호,엄태관,김재호 한국고분자학회 2007 한국고분자학회 학술대회 연구논문 초록집 Vol.2007 No.4

Variation of the Si-induced Gap State by the N defect at the Si/SiO₂ Interface

김규형,정석민 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.2