• 경영과정보연구
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• 제22권
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• pp.1-23
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• 2007

This paper investigates the relationships between exports, firm size, and firm dynamics. It is based on a longitudinal data covering listed firms in the Korean manufacturing industry. We found the stylized fact that the probability that a firm is exporter increases with firm size. A regression model for the determinant of export/sales ratio including dynamic adjustment process is tested on a cross-section sample for the year 2001. Empirical findings suggest that there is a positive and inversely U-shaped relationship between firm size and export/sales ratio, just for basic material and capital good industry. Except for firm size, the hypotheses concerning human capital intensity, physical capital intensity, R&D intensity, and patent are rejected. Using Granger causality test, we found that the rate of growth of total sales influences the change of the export/sales ratio with time lag for medium-sized firms. Finally, some policy implications are presented.

• 한국경영과학회지
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• 제29권1호
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• pp.31-41
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• 2004

This study analyzes the structure of the variations In the domestic bank earnings and examines their dynamic features by estimating the short-run response and the long-run adjustment Process after the changes in financial market variables. A system of the equations for the bank stock price index and KOSPI is formulated to utilize the whole information in the market and simultaneously estimated to identify the relationships between the market variables and the bank earnings. Since the bank stock price is found to be responsive to changes in none of the market variables in the short run, while being relatively responsive to dollar exchange rate and business state, It implies that a good economic conditions and a stable foreign exchange rate should be maintained to Improve the level of the stock price In the long run. In addition, the dynamic structure of the responses of the bank stock price index and KOSPI to the initial changes in the market variable are compared and anlayzed. The response of the bank stock price appears to take much longer in adjusting to the long-run eouilibrium level than that of KOSPI. As a result, the cumulative response of the bank stock price index over time is found much bigger than that of HOSPI.

• 대한기계학회논문집B
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• 제28권5호
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• pp.560-568
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• 2004

We performed the numerical study on the characteristics of the 3-D airflow and dynamic cross contamination in the photolithography process cleanroom. The nonunifurmity, the deflection angle and the global cross contamination were used for analyzing the characteristics and performances of cleanroom. From the numerical results, we knew that the airflow characteristics of the cleanrooms are largely affected by the porosity of panel and the adjustment of dampers and the global cross contamination varies with the location of source and the passage of time through the concentration ratio.

• 한국생산제조학회지
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• 제23권6호
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• pp.630-635
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• 2014

This study aims to develop a PZT-driven depth adjustment device with a flexure hinge and to investigate its static/dynamic characteristics. This device will be applied to rapidly and accurately trace a flat surface with slight waviness of up to several hundreds of micrometers in magnitude. One typical example is to cut a film coated on a steel plate. A depth control system composed of PMAC, PZT/PZT amplifier, flexure hinge/knife, and laser displacement sensor is implemented on a desktop three-axis machine and an actual cutting test is conducted on a steel workpiece with a sinusoidal-wavy surface. It is verified that the dynamic characteristics of the device limit the maximum cutting speed and depth precision.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.1141-1146
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• 1993

The problem of tension control in metal-strip processing line is discussed. A new mathematical dynamic model which relates tension change, motor-speed change and roll-gap change is developed. Through the computer simulation of this model, parameter sensitivity, the tension transfer phenominon, and static and dynamic characteristics of strip tension were studied. Guidelines are developed to help one selecting locations of the master-speed drive in multi-drive speed control for tension adjustment and reducing the effect of interaction between tension and roll gap control.

• 디지털융복합연구
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• 제6권1호
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• pp.53-61
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• 2008

For the domestic digital contents, a proactive cooperation system or framework between the government, the businesses and research institutions, which would allow for free flow of interaction among these players, can play that role. We have proposed and realized the Dynamic Coordinating Framework(DCF) to bridge these gaps among the major players in the industry. The the Dynamic Coordinating Framework rests on the following major functions. The first major function of the DCF is to decipher any ambiguity that may be embedded in external inputs by stratified role and bias. The second function is to create cooperative groups that will deal with the ambiguities based on its consequent situation. The third is a feedback function that will draw out a new cooperative way by re-feeding the capacities and the conflicts that stem from the existing organizations and strategies into cooperation and adjustment process. Our DCF has compared and evaluated with England and Australia digital content industry models under AHP(Analytic Hierarchy Process) method. DCF has turned out to be well designed and have strong points based on OECD innovation and cooperation criteria.

• 재무관리연구
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• 제25권3호
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• pp.33-78
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• 2008

본 논문은 우리나라의 재벌집단 및 비재벌집단 그리고 대규모집단 및 소규모집단을 대상으로 자본구조의 최적목표자본구조로의 조정과정과 평균회귀현상 및 장기균형하의 최적자본구조의 결정요인에 대한 실증분석을 실시하였다. 본 실증분석 결과는 아래와 같다. 첫째, 우리나라 상장제조업의 기업들에서 최적목표부채비율이 존재하며 또한 장기자본구조로 부분적으로 조정하였고 최적자본구조로의 평균회귀현상을 보였다. 둘째, 조정속도를 추정한 결과 일반적으로 재벌집단보다 비재벌집단, 대기업집단보다 소기업집단의 조정속도가 빨랐다. 셋째, 우리나라의 경우 자본시장이 부채조정속도에 오히려 제약으로 작용하였다. 넷째, 우리나라 기업들은 과거 목표부채와의 괴리정도에 따라 목표자본구조로의 조정 행태가 나타났다. 다섯째, 우리나라 기업들은 1년에 실제 레버리지와 목표레버리지의 차이를 약 1/4정도 줄이고 있었다. 이러한 결과를 통하여 볼 때, 자본 조달순위이론 또는 시장적기이론이 기업의 자본조달 의사결정을 설명하는 중요한 이론이 아니라는 것을 제시하고 있다. 여섯째, 기업고유변수 및 자본시장변수를 사용하여 장기균형상태의 최적자본구조 결정요인을 분석한 결과 기업변수뿐만 아니라 자본시장변수도 유의적인 영향요인으로 작용하였다.

• 한국사회복지학
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• 제63권2호
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• pp.179-205
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• 2011

암환자에게 부부적응은 심리적인 안녕 뿐만 아니라 치료경과 및 생존율에 영향을 미치는 것으로 보고되고 있어 이들의 부부적응을 도모하기 위한 사회복지 노력과 관심이 절실히 필요하다 하겠다. 이에 본 연구는 암환자와 배우자의 커플자료를 수집하여 이들의 부부적응에 대해 조사하였으며, 기초자료가 미비한 실정에서 부부관계의 지표로 부부적응에의 필수고려 요인으로 지목되고 있는 부부의사소통의 영향을 조사하였다. 또한 암환자와 배우자의 상호의존성을 고려하여 부부의사소통이 부부적응에 미치는 영향을 자기 자신에게 미치는 영향(자기효과), 상대방에게 미치는 영향(상대방효과)을 고찰하였다. 이를 통해 부부적응에 긍정적 부부의사소통의 중요성을 제시하였으며, 부정적 의사소통 유형인 요구-철회의사소통에서 환자의 배우자에 대한 상대방효과가 유의한 것으로 나타나 환자에 대한 의사소통 교육에의 필요성을 제시하였다. 이러한 연구결과를 바탕으로 실천적 함의 및 후속연구에 대한 제언을 제시하였다.

• 한국측량학회지
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• 제35권5호
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• pp.389-404
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• 2017

The main purpose of this presented investigation is to build up the BHMS based on GNSS. This proposed monitoring system can conduct the deflection and dynamic characteristics analysis by using only GNSS positioning solution. The general bridge monitoring system being operated recently is composed of a combination of various sensors that are able to conduct deflection monitoring and dynamic characteristics monitoring analysis at the same time. However, GNSS based BHMS has the unique procedure in terms of data analysis. In the other words, GNSS positioning solution is firstly applied to deflection monitoring analysis then, this deflection analysis can be sequentially reflected in the dynamic characteristics. Unfortunately, the adjustment result of GNSS positioning solution estimated through various options and conditions and the process of monitoring analysis has not been fulfilled systematically. This means that different results or analysis value are presented according to the methodology and officers. Most of researches have been focusing on deflection monitoring analysis and some investigation regarding to dynamic characteristics is recently introduced. Moreover, it is not still reported the systematic investigation with regards to proper filtering and analysis methodology. This study was carried out based on a large amount of data, from this, various variables not reported yet are actively considered. Therefore, specific software for both monitoring analysis have been developed.

• 대한설비공학회지:설비저널
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• 제17권4호
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• pp.382-394
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• 1988

Dynamic characteristics of thermally-forced stratification process in a square enclosure with a linear temperature profile at the side walls have been investigated through flow visualization experiment and numerical analysis. The experiment was performed on air with the Rayleigh numbers of order $10^5$. A particle tracer method is used for the flow visualization and to obtain a sudden linear temperature profile at the side walls copper blocks which already have a linear temperature profile are come into contact with the thin copper plates of the test section. Immediately a meridional circulation is developed and heat transfer takes place from the wall to the interior region by circulation of fluid and finally a thermal stratification is achieved. In the numerical study, QUICK scheme for convective terms, SIMPLE algorithm for pressure correction, and the implicit method for the time marching are adopted for the integration of conservation equations. Comparison of flow visualization and numerical results shows that the developing flow patterns are very similar in dynamic nature even though there is a time lag due to the inevitable time delay in setting up a linear temperature profile. For high Rayleigh numbers, the oscillatory motion is likely to take place and stratified region is extended. However, initial temperature adjustment process is much slower than that for low Rayleigh numbers.