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      • Truck Frame 결합부의 강도평가에 관한 연구

        송준혁,김종규,강희용,양성모 전북대학교 공업기술연구소 1998 工學硏究 Vol.29 No.-

        A structural joint represents a critical element in virtually all hardware. The mechanical fastened joint of bolted type is probably the most established and formalized design methodology at the present time. An overall analysis of the structure or structural component has been performed to determine the joint design loads and the internal load distribution. In this paper, a finite element analysis is conducted to obtain the effective joint load with the internal load distribution for 2.5T truck frame. The joint external loads are determined by the analysis of overall structures and each substructure with the joint. Using the proposed procedure, designers are able to obtain the criterion and optimization of any new developing or modified structures.

      • KCI등재

        KOSPI200 변동성의 장기기억 모형과 국면전환 모형간 예측력 비교 분석

        송준혁 한국은행 2011 經濟分析 Vol.17 No.4

        This paper investigates the long memory property of KOSPI200 volatility and compare the forecasting power between the long memory and regime switching models. When no regime-switching is assumed, the realized volatility and VKOSPI show no signs of permanent memory, but suggest that both of them have stationary long memory properties. Long memory can be spurious in the presence of structural or regime changes. In order to see this, 1-day and 5-day ahead volatility forecasting test, based on Diebold-Mariano(1995), are conducted to compare model prediction power between long memory and regime-switching models. The test shows that regime-switching model is more accurate in 1-day ahead realized volatility forecasting, while 1-day ahead forecasting shows no difference between the models. It suggests that long memory process of stock volatility can be better understood when structural-changing features of the volatility are given more attention. 본 논문에서는 KOSPI200 지수 변동성의 장기기억 속성을 분석하는 한편 장기기억과 레짐 스위칭 모형간의 예측력에 대한 실증 분석을 수행하였다. 레짐의 변화를 고려하지 않은 상태에서 실현변동성과 VKOSPI를 대상으로 단위근 검정을 수행한 결과 단위근의 존재는 발견되지는 않았으나, ARFIMA 모형을 이용하여 추정한 결과 이들 변동성들은 안정적인 장기기억 과정인 것으로 분석되었다. 장기기억 과정은 시계열에 구조 변화가 존재할 경우 가성적(spurious) 현상일 수 있다. 실제로 이를 검정하기 위해 구조 변화를 고려한 마코프 스위칭모형과 1일 및 5일 이후의 예측성과를 Diebold-Mariano(1995) 검정을 통해 살펴본 결과 실현변동성의 1일 예측에서는 마코프 스위칭모형의 예측력이 높게 나타난 반면 그 외의 경우에서는 두 모형간의 큰 차이는 발견되지 않았다. 이러한 결과는 장기기억 과정에 대한 이해를 높이기 위해서는 구조적 변화가 변동성에 가지는 의미에 관심을 둘 필요가 있음을 시사한다.

      • KCI등재

        A356 및 A357 합금으로 용탕단조한 상용차 휠 허브의 미세 조직 및 석출상 변화에 따른 기계적 물성 비교

        송준혁,문민석 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.3

        This study has related to lightweight automobiles due to global warming with the reduction of fossil fuel reserves are rapidly progressing around the automobile industry. This study has revealed the relationship for the mechanical properties via the analyzed microstructure, precipitated phase variation of the wheel hub of a commercial vehicle manufactured using molten forging technology using A356 and A357 alloys, which are high-strength Al-Si-Mg base cast aluminum alloys. Differential scanning calorimetry has performed to analyze the precipitation amount of each alloy that influences the mechanical properties of aluminum alloy. The XRD analysis has measured for the microstructure's crystal phase on A356 and A357 alloys. In this paper has evaluated to compare the properties of the A356 alloy and the A357 alloy for the mechanical properties. The A356 alloy has confirmed that a microstructure is finer than A357 alloy, and a quantity of precipitated material is more than A357 alloy. Therefore, this study confirmed that the A356 alloy has better mechanical properties than the A357 alloy.

      • Cardiovascular beriberi: rare cause of reversible pulmonary hypertension

        송준혁,전상수,배명환,이장훈,양동헌,박훈식,조용근,채성철 영남대학교 의과대학 2014 Yeungnam University Journal of Medicine Vol.31 No.1

        Cardiovascular beriberi is caused by thiamine deficiency and usually presents as high cardiac output failure associated with predominantly right-sided heart failure and rapid recovery after treatment with thiamine. Because of its rarity in developed countries, the diagnosis can often be delayed and missed. We recently experienced a case of cardiovascular beriberi with pulmonary hypertension which successfully treated with thiamine infusion. A 50-year-old man with chronic heavy alcoholics was refered to our department for dyspnea with mental change. Echocardiography showed marked right ventricular (RV) dilatation and flattening of the interventricular septum with a D-shaped deformation of the left ventricle. Moderate tricuspid valve regurgitation was found and estimated RV systolic pressure was 52 mm Hg. Because of his confused mentality and history of chronic alcohol intake, neurological disorder due to thiamine deficiency was suspected and intravenous thiamine was administered and he continuously received a daily dose of 100 mg of thiamine. Follow up echocardiography showed marked reduction of RV dilatation and improvement of a D-shaped deformation of the left ventricle. He finally diagnosed as cardiovascular beriberi on the basis of dramatic response to intravenous thiamine. Thiamine deficiency can cause reversible pulmonary hypertension, and can still be encountered in the clinical setting. Thus high index of suspicion is critically needed for diagnosis.

      • KCI등재후보

        Escaping from Punishment

        송준혁 한국법경제학회 2011 법경제학연구 Vol.8 No.2

        Most crime literature emphasizes the substitution between legal and criminal behaviors. It contends that when punishment becomes austere, the price of crime increases, which, other things being equal, leads to less consumption of crime. This argument applies well to new criminals. However, the incumbent criminal might take price signal differently. From the standpoint of existing criminals, stiffer punishment implies the price of being caught becomes high compared to that of being free, causing those criminals to put in more effort at future crime, hence hard to catch conditional on policing efforts. In this paper, we argue the second effect could have a non-trivial impact in the total number of crime in a society both in a static and dynamic model. Numerical exercises find that insufficient increase in punishment can end up more crime and place the society in a less desirable state than as is. These findings are consistent with our theoretical prediction.

      • 외생화 및 내생화가 산업연관분석에 미치는 효과: 주거용 건물 건설업을 대상으로

        송준혁 한국부동산분석학회 2017 부동산분석학회 학술발표논문집 Vol.2017 No.1

        본 연구에서는 산업연관분석을 이용한 경제적 파급효과를 측정하는 데 있어 외생화 및 내생화 기법이 미치는 영향을 분석해 보고자 한다. 생산 활동의 궁극적인 목적인 소비, 투자, 수출 등의 최종 수요 항목이 아닌 특정 산업의 수요 증가의 경제적 파급효과를 분석하는 과정에서 외생화를 적용할 경우에는 투입계수행렬에 변형을 가함으로써 해당 산업의 지출 증가에 따른 순수한 경제적 파급효과를 구할 수 있는 반면 외생화를 적용하지 않을 경우 해당 산업의 지출 증가가 다시 자신에 대한 중간 수요 증가로 이어져 경제적 파급효과가 제대로 계상되지 못할 우려가 존재한다. 본고에서는 부동산 산업 중 일반 국민에게 미치는 영향이 큰 주거용 건물 건설업을 대상으로 최종 수요에 대한 여러 형태의 내생화와 함께 외생화 적용 여부에 따른 경제적 파급효과의 차이를 살펴보았다. 분석 결과 외생화를 적용하지 않은 경우가 적용한 경우에 비해 경제적 파급효과가 모든 경우에서 높게 나타났으며 그 차이 역시 적지 않음을 확인하였다. 이러한 결과는 산업연관모형을 이용한 경제적 파급효과를 분석하고자 할 경우 모형의 선정에 보다 주의를 기울일 필요가 있음을 시사한다. The paper studies the effects of endogenous and exogenous methods in the input-output analysis on measuring the economic spillover effects. In order to analyze the economic spillover effect of the increase in the demand of a specific industry rather than the final demand such as consumption, investment, and export, which is the ultimate objective of production activity, we need to transform the original input-output coefficient matrix to obtain a net economic spillover effect due to an increase in expenditure. On the other hand, if the exogenous method is not applied, there is a concern that the spending increase of the industry will lead to an increase in the intermediate demand for itself, and the economic spillover effect will not be properly accounted for. The purpose of this study is to investigate the differences in the economic spillover effects of exogenous methods along with various forms of endogenous final demands to an increase in residential building construction expenditure. Based on the analysis, we find that the economic spillover effects when exogenous method is not applied are higher in all cases than those when exogenous method is applied, and the differences are also far from negligible. This result suggests that it is necessary to pay more attention to the model selection when analyzing the economic spillover effect using the input-output model.

      • KCI등재

        이자율 기간구조를 이용한 정책금리 변경의 효과 분석

        송준혁 한국개발연구원 2009 KDI Journal of Economic Policy (KDI JEP) Vol.31 No.2

        This paper estimates the term structure of interest rates with the setup of 3-factor no arbitrage model and investigates the trend of term premia and the effectiveness of changes in policy interest rates. The term premia are found to be high in a three-year medium term objective, which can be interpreted as reflecting the recognition of investors who expect a higher uncertainty in real activities for the coming three years than for a longer term. Then, in order to look into the effect of policy interest rates after the recent change of benchmark interest rate, this paper analyzes the effects of the changes in short-term interest rates of the financial market on the yield curve of the bond market at time of change. Empirical results show that the discrepancy between call rate, short-term rate in money market, and instantaneous short rate, short-term rate in the bond market, is found to be significantly widened, comparing to the periods before the change in benchmark interest rate. It is not easy to conclude clearly for now whether such a widening gap is caused by the lack of experiences with managing new benchmark interest rate or is just an exceptional case due to the recent turmoil in the global financial market. However, monetary policy needs to be operated in a manner that could reduce the gap to enhance its effectiveness. 본고에서는 3요인 무재정거래(3-factor no arbitrage) 조건하에서의 이자율 기간구조를 추정하고 이를 이용하여 기간프리미엄의 추이 및 정책금리 변경의 유효성을 분석하였다. 기간프리미엄의 경우 3년물에서 높게 나타나고 있는데, 이는 장기적인 경제 상황보다 향후 3년 정도의 시계에서 경제의 불확실성이 높을 것이라는 투자자들의 인식을 반영한 것으로 해석된다. 한편, 최근 기준 지표금리의 변경에 따른 통화정책의 효과성을 살펴보기 위해 지표금리 변경시점을 전후로 하여 금융시장에서의 단기금리 변경이 채권시장의 수익률곡선의 형태에 미치는 효과를 분석해 보았다. 분석 결과, 금융시장에서의 대표적인 단기금리인 콜금리와 채권시장에서의 단기금리인 초단기이자율 간의 괴리가 지표금리 변경 이전과 비교하여 크게 확대된 점을 발견할 수 있었다. 이러한 괴리 확대가 새로운 기준금리에 대한 운용겸험 미숙에 연유한 것인지, 최근의 국제금융시장 불안에 따른 예외적인 경우인지는 현 단계에서는 명확히 결론짓기 어려우나 통화정책의 유효성을 제고하기 위해서는 이러한 괴리를 축소하는 통화정책 운용이 필요할 것이다.

      • KCI등재

        이자율 기간구조를 이용한 정책금리 변경의 효과 분석

        송준혁,Song, Joonhyuk 한국개발연구원 2009 韓國 開發 硏究 Vol.31 No.2

        본고에서는 3요인 무재정거래(3-factor no arbitrage) 조건하에서의 이자율 기간 구조를 추정하고 이를 이용하여 기간프리미엄의 추이 및 정책금리 변경의 유효성을 분석하였다. 기간프리미엄의 경우 3년물에서 높게 나타나고 있는데, 이는 장기적인 경제 상황보다 향후 3년 정도의 시계에서 경제의 불확실성이 높을 것이라는 투자자들의 인식을 반영한 것으로 해석된다. 한편, 최근 기준 지표금리의 변경에 따른 통화정책의 효과성을 살펴보기 위해 지표금리 변경시점을 전후로 하여 금융시장에서의 단기금리 변경이 채권시장의 수익률곡선의 형태에 미치는 효과를 분석해 보았다. 분석 결과, 금융시장에서의 대표적인 단기금리인 콜금리와 채권시장에서의 단기금리인 초단기이자율 간의 괴리가 지표금리 변경 이전과 비교하여 크게 확대된 점을 발견할 수 있었다. 이러한 괴리 확대가 새로운 기준금리에 대한 운용겸험 미숙에 연유한 것인지, 최근의 국제금융시장 불안에 따른 예외적인 경우인지는 현 단계에서는 명확히 결론짓기 어려우나 통화정책의 유효성을 제고하기 위해서는 이러한 괴리를 축소하는 통화정책 운용이 필요할 것이다. This paper estimates the term structure of interest rates with the setup of 3-factor no arbitrage model and investigates the trend of term premia and the effectiveness of changes in policy interest rates. The term premia are found to be high in a three-year medium term objective, which can be interpreted as reflecting the recognition of investors who expect a higher uncertainty in real activities for the coming three years than for a longer term. Then, in order to look into the effect of policy interest rates after the recent change of benchmark interest rate, this paper analyzes the effects of the changes in short-term interest rates of the financial market on the yield curve of the bond market at time of change. Empirical results show that the discrepancy between call rate, short-term rate in money market, and instantaneous short rate, short-term rate in the bond market, is found to be significantly widened, comparing to the periods before the change in benchmark interest rate. It is not easy to conclude clearly for now whether such a widening gap is caused by the lack of experiences with managing new benchmark interest rate or is just an exceptional case due to the recent turmoil in the global financial market. However, monetary policy needs to be operated in a manner that could reduce the gap to enhance its effectiveness.

      • KCI등재

        Comparative study of typical and atypical benign epilepsy with centrotemporal spikes (Rolandic epilepsy)

        송준혁,이규하,정사준 대한소아청소년과학회 2008 Clinical and Experimental Pediatrics (CEP) Vol.51 No.10

        Purpose : This study aims to examine and compare the features of rolandic epilepsy. Methods : Of 158 patients selected retrospectively, 116 had typical (group A) and 42 had atypical (group B) rolandic epilepsy, as defined by Worrall's criteria. Results : The age at onset of the seizures in group A was 8.6±2.0 y and 6.2±1.7 y in group B (P>0.05). Among the 40 patients who underwent neuroimaging studies (25 patients in group A and 15 patients in group B), abnormal findings in group B included ventricular dilatation, mild cortical atrophy, and partial agenesis of corpus callosum. group A had no abnormal findings. The frequency of seizures was 2.0±1.0 and 2.3±1.2 per month in groups A and B respectively. Seizure control from the initial anticonvulsant treatment was achieved within 3 months in group A, and 3 to 12 months in group B. A 2-year remission rate was noted in 105 patients in group A and in 38 patients in group B. Of these, the recurrence rate after 2 y was 13 in group A and 12 in group B. Conclusion : Age of onset of seizures, gender, frequency of seizures before therapy, and 2-y remission rate were not significantly different in the 2 groups. However, neuroimaging abnormalities, the time to achieving seizure control from the initial anticonvulsant treatment, and the recurrence rate after being seizure-free for 2 y were significantly different in the 2 groups. Purpose : This study aims to examine and compare the features of rolandic epilepsy. Methods : Of 158 patients selected retrospectively, 116 had typical (group A) and 42 had atypical (group B) rolandic epilepsy, as defined by Worrall's criteria. Results : The age at onset of the seizures in group A was 8.6±2.0 y and 6.2±1.7 y in group B (P>0.05). Among the 40 patients who underwent neuroimaging studies (25 patients in group A and 15 patients in group B), abnormal findings in group B included ventricular dilatation, mild cortical atrophy, and partial agenesis of corpus callosum. group A had no abnormal findings. The frequency of seizures was 2.0±1.0 and 2.3±1.2 per month in groups A and B respectively. Seizure control from the initial anticonvulsant treatment was achieved within 3 months in group A, and 3 to 12 months in group B. A 2-year remission rate was noted in 105 patients in group A and in 38 patients in group B. Of these, the recurrence rate after 2 y was 13 in group A and 12 in group B. Conclusion : Age of onset of seizures, gender, frequency of seizures before therapy, and 2-y remission rate were not significantly different in the 2 groups. However, neuroimaging abnormalities, the time to achieving seizure control from the initial anticonvulsant treatment, and the recurrence rate after being seizure-free for 2 y were significantly different in the 2 groups.

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