• Journal of Korea Port Economic Association
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• v.31 no.1
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• pp.171-188
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• 2015

Logistics network has been increasingly acknowledged as one of the important driving force for economic development in China. With the scope of logistics effect broadening and the development of logistics infrastructure, both logistics network and economy in terms of GDP in China has experienced rapid development hand in hand. This paper investigates the relationship between logistics network and economic growth, using a dataset covering 31 provinces over the period from 2003 to 2012 in China. Factor analysis is applied to obtain a total evaluation of logistics function defining the impact of logistics network on the national economy growth. According to fixed effect panel data approach, a significant and positive impact of logistics network on economic growth in China is found, meanwhile, a comparative analysis regarding economic development between coastal provinces and interior provinces is also conducted. The results suggest that the impact of logistics network on economic growth is higher in eastern provinces than that in western provinces. The policy implication for other nations, in particular for developing nations, is logistics network should be regarded as an important driving force for economic development, and investment should be made in advance to achieve the best efficiency in economic development and planning.

• Korean Journal of Labor Studies
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• v.24 no.1
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• pp.261-295
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• 2018

This study draws on data from the 1st (2005) to 6th (2015) waves of the Workplace Panel Survey regarding workplaces with labor representatives, i.e., a trade union or labor-management council, and analyzes these using a fixed effects panel data model to examine the relationship between the level of worker participation and the economic performance of workplaces. Analysis results indicate that higher levels of worker participation in an earlier time period are associated with higher per-worker value added (productivity) and per-worker labor costs (wages) at the current time period, but only up to a certain level beyond which the effect is found to decrease, thus forming an inverted-U shape pattern. Considered from a broad framework, these results are in line with the theoretical predictions by Freeman and Lazear (1995), who had established the logic behind the dynamics of the participation of labor representatives in management activities. In view of the fact that the current average level of worker participation in Korea is very low, the empirical analysis results of this study presents the policy implication that raising the level of workplace participation somewhat beyond current levels would yield improvements in economic performance in terms of the shared rent between labor and management - i.e., productivity (per-worker value added).

• Journal of Korean Society of Transportation
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• v.30 no.1
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• pp.103-112
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• 2012

This research introduces a trip generation model reflecting time-series effects derived from a panel analysis with the data collected from the national household trip surveys conducted in 1996, 2002 and 2006. The existing methods are unable to reflect time-series effects from the change of socioeconomic conditions because the parameters applied to the model were basically from the base year of study - the parameter values were unchanged. This study proposes a new trip generation model developed through a panel analysis performed with the data collected from the last three national household trip surveys. From the results, it was found that the number of school trips increases and that the number of shopping trips decreases as time passes. The results showed that there are time-series effects affecting in trip generation.

• Journal of the Korean Data and Information Science Society
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• v.22 no.3
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• pp.413-421
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• 2011

The present study was carried out to summarize the effect of garlic in the hyperlipidemia rats by meta-analysis related studies. The association measure to test effect of garlic was the mean difference (MD). In this particular fixed-effect model of mean difference, body weight, liver weight, kidney weight and heart weight were significantly decreased (p < 0.05). Also, blood glucose, plasma total cholesterol, plasma triglycerides, LDL-cholesterol, liver cholesterol, liver triglycerides were significantly decreased. HDL-cholesterol was significantly increased. In this case of heterogeneous variable, random effect model was applied. In this model, liver weight, blood glucose, plasma total cholesterol, plasma triglycerides, LDL-cholesterol, liver cholesterol, liver triglycerides were significantly decreased. HDL-cholesterol was significantly increased. According to the meta-regression analysis, duration of injection was significantly for kidney weight, testis weight, plasma total cholesterol, plasma triglycerides, HDL-cholesterol, LDLcholesterol, liver cholesterol, liver triglycerides.

• KSBB Journal
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• v.23 no.3
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• pp.213-218
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• 2008

The present study was to investigate the continuous production of alcohol using immobilized carrier manufactured by polymeric materials. Fermentation runs with a crushed rice, with constituents recovered from batch culture and with ones from continuous culture were thus compared. The performances of immobilized carrier were governed by sandwitched synthetic polymers, the evolution of the continuous culture was steadily governed by the production of alcohol in the lag time of batch culture. The main focus was set on the enhancement of the alcohol production by an newly-developed polymeric forms. This polymeric form led to a drastic increase of the microorganism and the production cost in the continuous reactor was thereby reduced. The sandwitched polymeric-formed carrier, which was resistant to external environments, serves as an interesting alternative to maintain the stability of biological process. These whole results were discussed with the aim to better understand the continuous process implied in the microorganism's build-up during cultivation of fermentation broth.

• Journal of Digital Convergence
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• v.13 no.4
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• pp.61-68
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• 2015

This study aims to estimate the economic effects of the simulation golf industry. Two steps are taken. Step 1 is to calculate the direct effect which includes input required to install the facility and consumer's fee to pay for the simulation golf, and the indirect effect which includes the introduction of the field golf course derived from simulation golf. Step 2 is to calculate the production, value added and employment inducement effect. As a result of this calculation, total production inducement effect is 3.6 trillion won, value-added inducement effect is calculated at about 1.66 trillion won, while employment inducement effect is 34.6 thousand people in 2011. This study is expected to contribute to providing a basis for the policy to support the simulation industry and for estimation of the economic effect in the different simulation industry such as the simulation baseball.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.185-186
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• 2006

우리나라는 리아스식 해안으로 지형이 복잡하고, 특히 강하구에는 사주의 영향으로 선박의 통항로가 수시로 변화되고 있어, 어선들의 좌초사고가 빈번하게 발생하고 있으나, 수심이 옅고, 굴곡이 많아 등부표 등 항로표지의 설치가 불가능한 실정이므로, 이러한 지형 환경에 맞고, 비용이 저렴한 새로운 항로표지인 등주를 설치하기 위한 연구와 설치 후 효과분석을 기술한다.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.282-285
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• 2000

본 논문에서는 사용자의 분포에 따라 섹터의 크기가 가변되는 안테나의 섹터 형성과 오율성능 개선을 시뮬레이션을 통해 확인하였다. 섹터의 크기가 가변적이기 때문에 사용자의 분포에 따라 섹터별 부하의 차이를 줄일 수 있어 간섭제거 효과를 얻을 수 있었다. 시뮬레이션 결과 가우스 분포를 하는 사용자 수에 따라 섹터의 크기가 가변됨을 확인할 수 있었고, 고정된 섹터 시스템에 비해 동일한 SNR에 대해 오율성능이 개선됨을 알 수 있었다. 채널 환경으로는 가우스 잡음, 레일리 페이딩 및 다중 사용자 간섭을 고려하였고 변복조 시스템은 BPSK로 하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.910-911
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• 2015

본 논문에서는 COL, MPS타입의 선형 엑추에이터에서 middle stroke의 흡입력 향상을 위해 고정부에 돌극을 추가하는 모델을 제시하였다. 기존 모델과 비교하여 제안된 모델의 효과를 검증 하였으며 middle stroke에서 더 큰 힘을 얻기 위해 주효과분석과 반응표면법(RSM)을 이용하여 돌극 형상의 최적설계를 수행하였다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2001.11a
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• pp.303-304
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• 2001

주 구성요소가 산소와 질소 기체인 대기는 백색광을 지닌 광원, 즉 태양광에 대하여 선택적으로 빛을 산란시킴으로써 파란색을 나타낸다. 이것은 Rayleigh scattering 효과가 파장의 4승에 반비례하기 때문에 450nm 부근의 파란색은 700nm 부근의 빨간색에 비하여 약 6배이상 강한 빛을 산란시키기 때문이다. 그러나 실제로 하늘은 고정된 색을 지니고 있지는 않다. 태양과 관측자 및 관측지점의 유기적 관계에 의하여 하늘의 색은 주기적이며 임의적으로 다르게 보인다. (중략)