• The Journal of Asian Finance, Economics and Business
• /
• 제6권2호
• /
• pp.83-93
• /
• 2019

This paper provides empirical evidences from the Baltic States on the relationship between technology and trades. In this study, regression and correlation analysis were employed an attempt to reveal the relationship between technology index and net-export coefficient, as well as the relationship between technology index and import coefficient. In this research, technology level was measured by technology index, while trades included of domestic and foreign trades; export and import. The data used for this study were collected from world input-output databases of Estonia, Latvia and Lithuania for the period 2000, 2005, 2010, and 2014. The findings remarked that the relationship between technology and domestic trade was positive and statistically significant. The result of the study implies that the higher was the technology index leads to the higher domestic transaction. Furthermore, relationship between technology and net-export was unpredictable. In year 2000, data from Estonia and Latvia showed that the relationship between variables was negative and in other years of the study, the relationship was positive. However, the relationship between variables was not statistically significant. Lastly, the relationship between technology and import was negative and statistically significant. It implies that the higher was technology index, will have a consequence the smaller was import.

• 전기학회논문지
• /
• 제57권1호
• /
• pp.52-57
• /
• 2008

In the transformer that is used for the contactless power transmission system, the primary and secondary sides are separated structurally unlike general transformers. When the contactless transformer is built, it forms relatively bigger air gap than the general transformer. Thus it is difficult to transfer energy from the primary side input to the secondary side output with high power efficiently because of low coupling coefficient. This paper proposes a contactless transformer using the rectangular type core that maintains high coupling coefficient even when it has relatively large air gap. The performance characteristics of the proposed transformer are compared with the transformer using general EE core to the air gap variation. The proposed contactless system using rectangular type core and dc-dc full bridge converter, and the system using EE core type and dc-dc full bridge converter are respectively implemented and their performance characteristics are verified by the simulation and experiment.

• 한국통신학회논문지
• /
• 제19권2호
• /
• pp.195-201
• /
• 1994

다중 경로 신호를 억제하기 위하여 적응등화기, 다이버시티 컴바이너등의 사용은 이미 보편화 되어 있으나 어댑티브 안테나의 사용 가능성을 타진한 논문은 극히 그 수가 제한되어 왔다. 본 논문에서는 이에 착안, 애플범 타입의 어댑티브 안테나 어레이를 다중경로 신호 페이딩의 해결책으로 사용할 수 있는 이론적 근거를 제시하였으며 어레이출력신호가 다중경로 신호의 존재에도 불구하고 어떻게 선명도가 보장되는지를 수식화 하고 컴퓨터 시뮬레이션에 의해 효용성을 입증하였다.

• 한국통신학회논문지
• /
• 제39A권9호
• /
• pp.560-562
• /
• 2014

국내 이동통신 주파수를 모두 수용할 수 있는 광대역분배기를 설계 및 제작하였다. 제작한 20W급 광대역분배기는 810 ~ 2620MHz의 동작주파수에서 삽입손실은 최대 3.49dB, -18.48dB 이하의 입력반사계수, -20.2dB 이하의 출력반사계수, 24.7dB 이상의 격리도 그리고 3차 PIMD(Passive Intermodulation Distortion)는 -141.2dBc의 성능을 갖는다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2000년도 춘계학술대회 논문집
• /
• pp.591-594
• /
• 2000

In the recent day, fatigue life prediction techniques play a major role in the design of components in the ground vehicle industry. Full scale durability testing in the laboratory is an essential of any fatigue life evaluation of components or structure of the automotive vehicle. Component testing is particulary important in today's highly competitive industries where the design to reduce weight and production costs must be balanced with the necessity to avoid expensive service failure. Generally, 3-axis durability testing device is used to carry out the fatigue test. In this paper, The operation software for simultaneously driving 3-axis vibration testing device is developed and the displacement of the 3-axis actuator is separately calibrated by LDT Moreover, the input and output data are displayed in windows of PC controller with real time.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
• /
• pp.141-141
• /
• 2000

In the recent day, fatigue life prediction techniques play a major role in the design of components in th ground vehicle industry. Full scale durability testing in the laboratory is an essential of any fatigue life evaluation of components or structure of the automotive vehicle. Component testing is particularly important in today's highly competitive industries where the design to reduce weight and production costs must be balanced with the necessity to avoid expensive service failure. Generally, multi-axis durability testing simulator is used to car교 out the fatigue test. In this paper, the operation software for simultaneously driving 3-axis simulator is developed and the real-time signals of input-output data are displayed in window of PC. Moreover, the displacements and the loads of 3-axis actuators are calibrated separately and the operating characteristics of the actuators are evaluated.

• 한국자동차공학회논문집
• /
• 제9권2호
• /
• pp.143-151
• /
• 2001

In the recent day, fatigue life prediction techniques play a major role in the design of components in the ground vehicle industry. Full scale durability testing in the laboratory is an essential of any fatigue life evaluation of components or structure of the automotive vehicle. Component testing is particularly important in todey's highly competitive industries where the design to reduce weight and production costs must be balanced with the necessity to avoid expensive service failure. Generally, Multi-axis durability testing device is used to carry out the fatigue test. In this paper, The operation software for simultaneously driving Multi-axis vibration testing device is developed and the input and output data are displayed in windows of PC controller with real time. Moteover the characteristics of the displacement and the load of Multi-axis actuators are calibrated separately.

• 소성∙가공
• /
• 제5권1호
• /
• pp.61-71
• /
• 1996

A computer-aided process design system for axisymmetric deep drawing products has been developed. An approach to the system is based on the knowledge based system. Knowledges for the system are formulated from the plasticity theory handbooks experimental results and empirical knowhow of the field experts. the system is composed of four main modules such as geometrical design test & rectification and user modification. The input to the system is final sheet-metal object geometry and the output from the system is process sequence with intermedi-ate objects geometries and process parameters, such as drawing load blank holding force clearance cup-drawing coefficient.

• Journal of electromagnetic engineering and science
• /
• 제15권1호
• /
• pp.44-52
• /
• 2015

A worst-case estimate of an envelope correlation coefficient (ECC) is obtained for small multiple-input multiple-output (MIMO) mobile antennas operating below 1 GHz. The worst-case estimate is numerically derived in this paper using spherical and exponential wave functions. The derived result confirms that the worst-case ECC can be easily obtained from the rotation angle between the radiation patterns of two MIMO elements, which are attained directly from the amplitude of 2D electric field patterns without any additional phase and polarization information. As a practical example, MIMO mobile antennas with different antenna element arrangements are compared to verify the validity of the proposed worst-case estimate. Moreover, based on these analyses, we also suggest an effective approach to reduce the ECC of a small MIMO mobile antenna operating below 1 GHz by properly locating the antenna elements to make the radiation patterns perpendicular to each other.

• 예술인문사회 융합 멀티미디어 논문지
• /
• 제7권7호
• /
• pp.671-678
• /
• 2017

본 연구는 광고산업과 영화산업의 산업연관분석 효과를 살펴보기 위해 산업연관분석을 실시하였다. 분석 결과, 1993년부터 2008년까지 생산유발효과가 증가 추세를 보여 광고산업의 증가가 영화산업의 생산성에 긍정적인 영향력을 가지고 있는 것으로 나타났다. 그러나 2009년부터 2012년까지 다시 감소하였으며, 2014년에는 0.028원으로 이전보다 생산유발효과가 증가한 것으로 나타나 광고산업의 영향력이 안정적이진 않았다. 부가가치효과의 경우, 연도별로 등락이 빈번한 것으로 나타났다. 광고산업의 전방연쇄효과를 파악하기 위해 감응도 계수를 살펴본 결과, 점차 감소하고 있는 것으로 나타났다. 후방연쇄효과를 나타내는 영향력 계수의 경우에는 1998년 이후 감소 추세를 보이다가 2009년을 기점으로 증가한 것으로 나타났다. 본 연구결과는 광고산업이 미디어 산업에 미치는 후방연쇄효과가 크다는 기존연구의 결과를 재확인하였으며, 광고산업이 영화산업의 발전에 기여하고 있음을 나타내는 결과이다. 본 연구는 광고산업이 영화산업에 미치는 영향을 분석함으로써 광고산업의 산출물의 투입에 따른 영향력을 검증하였으나, 후속연구로서 영화산업에 대한 광고산업의 영향력과 출판, 방송 등의 타 산업 간의 비교가 필요하다.