• Journal of Information Technology Applications and Management
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• 제26권6호
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• pp.47-63
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• 2019

The volatility of major crypto currencies was examined and they are diagnosed whether they have a systematic risk or not, by estimating market beta representing systematic risk using GARCH( Generalized Auto Regressive Conditional Heteroskedastieity) model. First, the empirical results showed that their prices are very volatile over time because of the existence of ARCH and GARCH effects. Second, in terms of efficiency, asymmetric GJR model was estimated to be the most appropriate model because the standard error of a market beta was less than that of the OLS model and GARCH model. Third, the estimated market beta of Bitcoin using GJR model was less than 1 at 0.8791, showing that there is no systematic risk. However, unlike OLS model, the market beta of Ethereum and Ripple was estimated at 1.0581 and 1.1222, showing that there is systematic risk. This result shows that bitcoin is less dangerous than Ripple and Ethereum, and ripple is the most dangerous of all three crypto currencies. Finally, the major cryptocurrency found that the negative impact caused greater variability than the positive impact, causing bad news to fluctuate more than good news, and therefore good news and bad news had a different effect on the variability.

• The Journal of Asian Finance, Economics and Business
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• 제6권1호
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• pp.83-89
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• 2019

The purpose of this paper is to examine how the social system of deposit insurance affected the financial market in Korea. Specifically, we want to know how much the risk-seeking behavior of financial institutions has increased or decreased. The most important feature of the deposit insurance system is to prevent the insolvency of financial institutions and to properly protect depositors. In recent studies, it has been argued that characteristics of deposit insurance bring moral hazard of financial institutions and that financial institutions make unreasonably risky investments. Therefore, in this study, we will first examine whether such previous research can be applied to the Korean financial market. Next, we will examine the appropriateness of the differential premium rate that is currently used for each financial institution in the Korean financial market. In order to test the first hypothesis, we used the Capital Asset Pricing Model (CAPM) to calculate the total risk for each financial institution. As a result, significant changes were found in all regions before and after the introduction of the deposit insurance system. As for testing the second hypothesis, we conducted a variance analysis of financial institutions' indexes before and after the introduction of the deposit insurance and we discovered significance of the total risk difference.

• 디지털융복합연구
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• 제16권12호
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• pp.175-183
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• 2018

본 논문의 연구목적은 국내 회사채시장에서 시장전체의 체계적 위험 (systematic risk)과 각각의 고유위험(idiosyncratic risk)이 회사채 수익률에 미치는 영향을 분석하고자 한다. 2001년부터 2014년까지 채권시장의 자료를 분석하기 위해, 본 연구는 체계적 위험의 대용변수로 기존의 연구에서 사용된 회사채수익률 기간구조 요인(term factor)과 지급불능 요인(default factor) 등을 사용하고, 고유위험의 대용변수로 듀레이션(duration)과 신용평가등급 요인을 선정하였다. 이러한 요인들이 채권의 수익률에 미치는 영향력을 횡단면 회귀분석을 통해 분석한 결과, 체계적 위험과 관련된 요인들은 통계적 설명력이 있는 것으로 나타났다. 반면에 회사채 고유위험과 관련된 요인들은 기존의 국내 연구와 달리 회사채 수익률을 통계적으로 설명하지 못하는 것으로 나타났다. 이러한 결과는 본 연구의 분석기간이 기존 연구의 7년 자료보다 긴 14년간의 자료를 사용하고 최근의 기간까지 확장했다는 점 때문에, 오히려 미국의 연구결과와 유사한 것으로 나타났다. 이는 우리나라 채권시장이 IMF사태 이후 국제화가 확대되어 선진국과 동조현상을 보이는 것으로 해석된다. 따라서 본 연구는 국내 채권투자시장에서도 선진국의 경우와 마찬가지로 개별 채권의 특성보다는 채권시장 전체의 위험에 보다 더 집중해서 투자할 필요가 있다는 점을 제시하고 있다.

• 한국콘텐츠학회논문지
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• 제15권7호
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• pp.531-543
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• 2015

현재까지 서울 오피스 시장의 경우 관례적으로 고정된 보증금/월세 비율로 인해 보증금에 대한 이론적인 분석의 여지가 없었다. 하지만 본 연구는 글로벌 스탠다드인 점유비용의 개념을 도입하여 오피스 임대시장의 월세 미납 리스크에 대한 분석을 시도한다. 또한 정보비대칭 상황에서 보증금의 수준이 임차인의 역선택 문제를 해소하는 수단으로 사용될 수 있다는 Benjamin, Lusht, and Shilling(1998)의 견해에 따라 본 연구는 정보비대칭 상황인 서울 오피스 시장을 대상으로 보증금과 월세의 수준이 어떻게 정보비대칭 문제를 해결하는지 검증하고자 한다. 실증분석 결과 오피스 임대인들은 월세 미납 리스크를 헤지하기 위해 약 9%의 리스크 프리미엄을 점유비용에 부과하는 것으로 나타났다. 이러한 결과는 오피스 임대시장에서 보증금 및 월 임대료의 운용수익률을 산정할 때, 임차인이 가지는 월세 미납 리스크의 반영 수준을 추정할 수 있게 한다.

• Journal of applied mathematics & informatics
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• 제27권5_6호
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• pp.1073-1086
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• 2009

This paper considers the problems of martingale measures and risk-minimizing hedging strategies in the market with restricted information. By constructing a general restricted information market model, the explicit relation of arbitrage and the minimal martingale measure between two different information markets are discussed. Also a link among all equivalent martingale measures under restricted information market is given. As an example of restricted information markets, this paper constitutes a jump-diffusion process model and presents a risk minimizing problem under different information. Through $It\hat{o}$ formula and projection results in Schweizer[13], the explicit optimal strategy for different market information are given.

• 한국경영과학회지
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• 제29권2호
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• pp.45-57
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• 2004

The purpose of this paper is studying the valuation of option prices in Incomplete markets. A market is said to be incomplete if the given traded assets are insufficient to hedge a contingent claim. This situation occurs, for example, when the underlying stock process follows jump-diffusion processes. Due to the jump part, it is impossible to construct a hedging portfolio with stocks and riskless assets. Contrary to the case of a complete market in which only one equivalent martingale measure exists, there are infinite numbers of equivalent martingale measures in an incomplete market. Our research here is focusing on risk minimizing hedging strategy and its associated minimal martingale measure under the jump-diffusion processes. Based on this risk minimizing hedging strategy, we characterize the dynamics of a risky asset and derive the valuation formula for an option price. The main contribution of this paper is to obtain an analytical formula for a European option price under the jump-diffusion processes using the minimal martingale measure.

• 전기학회논문지P
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• 제59권3호
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• pp.263-267
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• 2010

Although electricity market structures may be different from each country, they have a long-term forward market and a short-term spot market in general. Particularly, a bilateral contract transacted at a long-term forward market fixes the electricity price between a genco and a customer so that the customer can avoid risk due to price-spike in the spot market. The genco also can make an efficient risk-hedging strategy through the bilateral contract. In this paper, we propose a new mechanism for deriving the optimal bilateral contract price using game theory. This mechanism can make the customer reveal his true willingness to purchase so that an adequate bilateral contract price is derived.

• Journal of Electrical Engineering and Technology
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• 제9권3호
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• pp.789-795
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• 2014

In a demand response (DR) market run by independent system operators (ISOs), load aggregators are important market participants who aggregate small retail customers through various DR programs. A load aggregator can minimize the allocation cost by efficiently allocating its demand response resources (DRRs) considering retail customers' characteristics. However, the uncertain response behaviors of retail customers can influence the allocation strategy of its DRRs, increasing the economic risk of DRR allocation. This paper presents a risk-based DRR allocation method for the load aggregator that takes into account not only the physical characteristics of retail customers but also the risk due to the associated response uncertainties. In the paper, a conditional value-at-risk (CVaR) is applied to deal with the risk due to response uncertainties. Numerical results are presented to illustrate the effectiveness of the proposed method.

• 한국안전학회지
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• 제27권3호
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• pp.42-48
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• 2012

This paper is aimed to analysis of electrical fire risk by overcurrent and series arc signals in traditional market shops Firstly, the field state investigation was conducted for shops at the traditional market (30 shops). At each shop in the traditional market, load characteristics were investigated and thermal characteristics in Panel were analyzed. Thermal characteristics in Panel is an indicator that can determine the impact of overcurrent. Results of the field state investigation found out four shops which showed abnormal thermal characteristics in Panel. Electrical load characteristics of these 4 shops were simulated by experimental setup consists of generator, motor and heater. In order to verify the electrical fire risk by electrical loads of 4 shops, arc and overcurrent experiments were conducted. The waveshapes of arc and overcurrent are investigated in both the time and frequency domains to find signal characteristics. The results obtained in this paper will be very helpful for the prevention of electrical fires occurred at the shops in the traditional market.

• 한국융합학회논문지
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• 제6권5호
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• pp.1-8
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• 2015

공정가치 서열체계 정보는 각 수준에 따라 측정오류의 발생가능성과 정보비대칭 정도, 그리고 내포된 정보 위험이 다를 것으로 예상된다. 따라서 본 연구에서는 수준별 공정가치 서열체계 정보가 기업의 자본비용에 어떤 차별적인 영향을 미치는지 살펴본다. 2011년부터 2014년까지 한국주식시장에 상장된 기업들을 대상으로 실증 분석한 결과, 수준 1과 수준 2의 공정가치 변수의 회귀계수 값은 자본비용 유형에 따라 크기의 순위가 바뀌었지만, 수준 3의 회귀계수는 모든 자본비용 변수에 대하여 가장 큰 회귀계수 값을 가지는 것으로 나타났다. 또한 기업의 시장위험 관리 수준과 감사품질에 따라 공정가치 서열체계에 따른 자본비용의 관련성이 어떻게 달라지는 가를 추가적으로 분석하였으나 일관성 있는 결과를 얻을 수 없었다. 그러나 시장위험관리와 감사품질 변수를 융합하여, 동시적인 상호작용 효과를 분석한 결과, 시장위험관리 수준이 높고 감사품질이 높은 경우 수준 3의 자본비용을 증가시키는 효과가 크게 완화되는 것으로 나타났다. 따라서 공정가치 서열체계 정보는 내포된 정보위험에 따라 자본비용에 미치는 영향이 달라지며, 경영자의 시장위험관리 수준이나 감사품질에 따라 정보위험은 감소될 수 있음을 보여주었다.