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Review of Cave Surveying Techniques
Worthington, Steve The Speleological Society 1997 Journal of the speleological society of korea Vol.5 No.2
The main purpose of this article is to compare different mapping techniques, so that an appropriate one may be chosen for a particular cave. Ultra-accurate techniques such as using tripods are not discussed here, as their application is limited to a small minority of caves. Most modem mapping is carried out under time restraints, due to the shortness of an expedition or the difficulty of a cave; thus, rapid mapping techniques are emphasized here.(omitted)
Andrew Worthington,Helen Higgs 연세대학교 동서문제연구원 2006 Global economic review Vol.35 No.3
This article examines market risk in four demutualised and self-listed stock exchanges: the Australian Stock Exchange, the Deutsche Börse, the London Stock Exchange and the Singapore Stock Exchange. Daily company and Morgan Stanley Capital International(MSCI) index returns provide the respective asset and market portfolio data. A bivariate GARCH model is used to estimate time-varying betas for each exchange from listing until 7 June 2005. While the results indicate significant beta volatility, unit root tests show the betas to be mean-reverting. These findings are used to suggest that despite concerns that demutualised and self-listed exchanges entail new market risks that merit regulatory intervention, the betas of the exchange companies have not changed significantly since listing. However, market risk does vary considerable across the exchanges, with mean time-varying betas of 0.56 for the Deutsche Börse, 0.66 for the London Stock Exchange, 0.78 for the Singapore Stock Exchange, and 0.95 for the Australian Stock Exchange.
Evaluating Financial Development in Emerging Capital Markets with Efficiency Benchmarks
Andrew C. Worthington,Helen Higgs 중앙대학교 경제연구소 2006 Journal of Economic Development Vol.31 No.1
This paper examines the weak-form market efficiency of twenty-seven emerging markets. The sample encompasses three markets in Africa (Egypt, Morocco and South Africa), ten in Asia (China, India, Indonesia, Korea, Malaysia, Pakistan, the Philippines, Sri Lanka, Taiwan and Thailand), four in Europe (Czech Republic, Hungary, Poland and Russia), seven in Latin America (Argentina, Brazil, Chile, Colombia, Mexico, Peru and Venezuela) and three in the Middle East (Israel, Jordan and Turkey). Daily market returns are tested for random walks using serial correlation coefficient and runs tests, Augmented Dickey-Fuller (ADF), Phillips-Perron (PP) and Kwiatkowski, Phillips, Schmidt and Shin (KPSS) unit root tests and multiple variance ratio tests. The serial correlation and runs tests conclude that most emerging markets are weak-form inefficient. However, the unit root tests suggest the presence of weak-form efficiency in many emerging markets, but with some exceptions. The results from the most stringent multiple variance ratio tests are in general agreement with the serial correlation and runs tests. On this basis, only Hungary, Jordan and Israel are weak-form market efficient, with Egypt, Korea, Malaysia and Argentina meeting at least some of the requirements of a random walk.
골 이식술이 환자에 의해 거부되는 경우 : 임프란트 술식이 여전히 치료방법으로서 의미를 가질 수 있는가에 관한 고찰
양윤석,Yang, Yun-Seok,Worthington, Philip Korean Association of Maxillofacial Plastic and Re 1997 Maxillofacial Plastic Reconstructive Surgery Vol.19 No.4
골의 퇴축 혹은 수술시의 절제로 인해 임플란트를 식립하기엔 불충분한 악골을 가진 환자에 있어서 골 이식술의 필요성은 오랫동안 논의 되어왔다. 골이식술은 악골의 전체 두께(full thickness)결손시 연결성(continuity)의 수복, 혹은 표면(surface)에서의 골상실시 보강(augmentation)목적으로 쓰일 수 있다. 따라서 술자들은 임플란트를 식립하기에 불충분한 악골을 가진 환자에 있어 골 이식술에 권유하게된다. 그러나, 골 이식술은 donor site 의 morbidity혹은 수술에 대한 두려운, 추가되는 비용에 대한 염려등으로 인해 환자에 의해 거부될 때가 종종 있다. 악골 결손으로 인해 골이식없이는 임플란트를 식립하기 어려운 경우에 있어서도 임플란트 술식이 여전히 해결책이 될 수 있을까? 다음의 두가지 증례를 통해 저자등은 골이식술 없이는 임플란트르 식립하기 어려운 경우에 있어서도 임플란트 술식이 여전히 치료방법으로서 의미가 있었음을 보고하는 바이다.
( Helen Higgs ),( Andrew C. Worthington ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2010 Journal of Economic Integration Vol.25 No.3
This paper measures financial integration among selected European Union equity markets over the period July 1990 to June 2006 using daily data. Eleven markets (Austria, Belgium, Denmark, France, Germany, Greece, Ireland, Italy, Netherlands, Spain and the United Kingdom) are included in the analysis. Panel unit root tests are used to test for non-stationarity, and multivariate cointegration, Granger causality and level VAR procedures and variance decompositions are conducted to examine the equilibrium and causal relationships among these markets. The results indicate that there is a stationary long-run equilibrium relationship among and significant and substantial short and long run causal linkages between these markets. The findings offer complementary evidence that a high level of financial integration now prevails in the region.
Flicker Mitigation for a Grid-Connected Tidal and River Power Generator Using the BESS
S. Seo,J. Kim,E. Muljadi,S. Meor-Danial,M. Worthington,R. Wills 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In the grid-connected tidal and river power generation, the water turbulence and the grid condition can induce the fluctuating output power. This power fluctuation may cause a power quality issue such as flicker, or voltage fluctuations, during the continuous operation. Hence, it is important to assess flicker emission and to mitigate flicker in order to solve this power quality issue. This paper proposes a Battery Energy Storage System (BESS) installed between the power converters of the tidal and river power system in order to mitigate flickers in different grid conditions. The BESS smooths the active power fluctuations and reduces flicker even from the weak grid with the low impedance angle in the distribution network. The feasibility of the proposed BESS system has been tested using a simplified simulation model with interconnected inverters developed in the validated simulation tool of PSCAD/EMTDC, and the obtained results from the case studies are presented.