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지역 산업의 특화 수준이 스마트 특성화에 미치는 영향 분석
동진우 ( Dong Jinwoo ),정혜진 ( Jung Hyejin ) 한국지방행정연구원 2020 地方行政硏究 Vol.34 No.4
한국에서는 지역 기반의 혁신을 활성화하기 위해 2020년부터 스마트 특성화가 본격적으로 시행되었다. 그러나 아직까지 스마트 특성화의 추진에 영향을 미칠 수 있는 지역별 기술 특성에 대한 연구가 부족한 상황이다. 이에 본 연구는 16개 광역시도의 2007년부터 2017년까지 5년 단위 패널 자료를 토대로 지역이 보유하고 있는 기술적 연관성과 복잡성이 스마트 특성화에 미치는 영향을 분석하고자 하였다. 일반화 선형 모형으로 분석한 결과 평균 기술 근접성 및 기술 복잡성(유망 및 안정 기술)이 스마트 특성화에 긍정적인 영향을 미치는 것으로 나타났다. 이 외에도 지역별 연구개발비가 스마트 특성화에 유의미한 영향력을 미치는 변수로 분석되었다. 이러한 결과는 지역마다 비교 우위를 지닌 산업과 관련이 있는 기술의 특성과 수준에 따라 지역발전이 불균등하게 이루어질 수 있음을 시사하고 있다. 본 연구는 분석 결과를 토대로 향후 스마트 특성화의 원활한 추진을 위한 정책적 시사점을 제시하였다. Smart specialization designed to facilitate regional innovation has been implemented in South Korea since 2020. However, there are insufficient studies dealing with technological attributes that can affect smart specialization. The present study aims to examine whether technological relatedness and complexity influence smart specialization by using a panel data set comprised of 16 metropolitan regions for the five-year periods between 2007 and 2017. The results obtained from a general linear model indicate that average technological relatedness and technological complexity(i.e., promising and stable technologies) positively affect smart specialization. In addition, the amount of R&D investment is positively associated with smart specialization. These result show that technological attributes and the extent of technological development in sectors with comparative advantages result in geographical disparities in regional economic development. Based on results, this study suggests various policy implications for practical implementation of smart specialization.
동진우 ( Jinwoo Dong ),정수관 ( Sukwan Jung ),김영덕 ( Youngduk Kim ) 한국국제경제학회 2016 국제경제연구 Vol.22 No.4
본 연구는 대표적 소비자의 동태적 최적화 문제에서 유도된 휘발유 수요함수를 기반으로 교통혼잡비용이 휘발유 수요와 가격탄력성에 미치는 영향을 살펴보았다. 또한, 휘발유 가격의 내생성을 고려하여, 2SLS(Two Stage Least square), GMM(Generalized Method of Moments), 및 Arellano-Bond 추정방법을 적용하여 통상적인 회귀분석과 비교하였다. 분석 결과, 첫째, 교통혼잡비용이 많이 들수록 가격탄력성 역시 높아지는 것으로 나타났다. 둘째, 휘발유 가격에 내생성이 있음을 확인하였고, 2SLS, GMM, 및 Arellano-Bond 추정방법이 OLS에 비해 일치성과 불편성을 보장하는 것으로 나타났다. 마지막으로 교통혼잡비용이 누락되는 경우 가격탄력성이 과대평가되는 것으로 나타났다. 이를 통해 엄밀한 휘발유 수요 추정 및 예측을 위해서는 가격의 내생성과 교통혼잡비용을 고려할 필요가 있음을 확인할 수 있었다. This study examined the effect of traffic congestion costs on gasoline demand based on gasoline demand function derived by a dynamic optimization. Considering endogeneity of gasoline price, 2SLS, GMM, and Arellano-Bond methods were compared with OLS. First, the estimated coefficients were as expected. Second, the higher price elasticity was associated with the higher traffic congestion costs. While consumers in the metropolitan area confront high traffic congestion costs, they seem to react flexibly on price changes because they can use other choices of transportation (bus, subway, etc.) besides their own cars. Third, endogeneity was found, and 2SLS, GMM, and Arellano-Bond was more reliable than OLS. Also, price elasticity in the model without holding traffic congestion costs were overestimated otherwise. The findings imply that considering endogeneity of price and congestion costs may improve estimates and predictions of gasoline demand.
Jin-Hyeuk Kwon,Dong-Wan Kang,Jinwoo Kim 경상대학교 농업생명과학연구원 2015 농업생명과학연구 Vol.49 No.6
From August to October 2013, a powdery mildew was found on Japanese artichoke(Stachys sieboldii) in Jinju, Korea. White colonies were present on leaves and petioles. Severely infected lesions were discolored, being brown. In the present study, the morphological features of anamorphic and teleomorphic Korean specimens were studied. To complete the identification, the sequence of the internal transcribed spacer region of the ribosomal RNA gene(ITS rRNA) was analyzed. Based on morphological characteristics, including anamorphic and teleomorphic features, as well as analysis of the ITS rRNA gene region, the fungus associated with the symptoms was identified as Neoerysiphe galeopsidis. Although the host ranges of powdery mildew caused by N. galeopsidis has been previously recorded, no full description or illustration of fungal symptoms and signs on Japanese artichoke has yet appeared. To the best of our knowledge, this is the first full description of powdery mildew disease on Japanese artichoke featuring molecular identification, morphological features, symptoms, and signs in Korea.
Jinwoo Choi,Dong Gun Kam,Daehyun Chung,Srinivasan, K.,Govind, V.,Joungho Kim,Swaminathan, M. Institute of Electrical and Electronics Engineers 2007 IEEE transactions on advanced packaging Vol.30 No.2
<P>This paper presents near-field (NF) and far-field (FF) analysis of alternating impedance electromagnetic bandgap (AI-EBG) structure in packages and boards. Three test vehicles have been designed and fabricated for NF and FF measurements. Simulation results using a full-wave solver (SONNET) have been compared with measurement results. This paper investigates the radiation due to return current on different reference planes. The analysis results from simulations and measurements provide important guidelines for design of the AI-EBG structure based power distribution network for noise isolation and suppression in mixed-signal systems</P>
( Jinwoo Lee ),( Seong Jin Jo ),( Youngjin Cho ),( Ji Hyun Lee ),( Il-young Oh ),( Jin Joo Park ),( Young-seok Cho ),( Dong-ju Choi ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.0
Background/Aims: There are concerns that the use of renin-angiotensin system (RAS) blockers may increase the risk of being infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) or progressing to a severe clinical course after infection. This this study aimed to investigate the influence of RAS blockers on the risk and severity of SARS-CoV-2 infection. Methods: We conducted a retrospective cohort study analyzing nationwide claims data of 215,184 adults who underwent SARS-CoV-2 tests in South Korea. The SARS-CoV-2 positive rates and clinical outcomes were evaluated according to the use of RAS blockers in patients with hypertension (n = 64,243). Results: In total, 38,919 patients with hypertension were on RAS blockers. The SARS-CoV-2 positive rates were significantly higher in the RAS blocker group than in the control group after adjustments (adjusted odds ratio [OR], 1.22; 95% confidence interval [CI], 1.10 to 1.36; p < 0.001), and matching by propensity score (adjusted OR, 1.16; 95% CI, 1.03 to 1.32; p = 0.017). Among the 1,609 SARS-CoV-2- positive patients with hypertension, the use of RAS blockers was not associated with poor outcomes, such as mortality (adjusted OR, 0.81; 95% CI, 0.56 to 1.17; p = 0.265), and a composite of admission to the intensive care unit and mortality (adjusted OR, 0.95; 95% CI, 0.73 to 1.22; p = 0.669). Analysis in the propensity score-matched population showed consistent results. Conclusions: In this Korean nationwide claims dataset, the use of RAS blockers was associated with a higher risk to SARS-CoV-2 infection but not with higher mortality or other severe clinical courses.
An Enhanced Remote Data Checking Scheme for Dynamic Updates
( Lin Dong ),( Jinwoo Park ),( Junbeom Hur ),( Ho-hyun Park ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.5
A client stores data in the cloud and uses remote data checking (RDC) schemes to check the integrity of the data. The client can detect the corruption of the data using RDC schemes. Recently, robust RDC schemes have integrated forward error-correcting codes (FECs) to ensure the integrity of data while enabling dynamic update operations. Thus, minor data corruption can be recovered by FECs, whereas major data corruption can be detected by spot-checking techniques. However, this requires high communication overhead for dynamic update, because a small update may require the client to download an entire file. The Variable Length Constraint Group (VLCG) scheme overcomes this disadvantage by downloading the RS-encoded parity data for update instead of the entire file. Despite this, it needs to download all the parity data for any minor update. In this paper, we propose an improved RDC scheme in which the communication overhead can be reduced by downloading only a part of the parity data for update while simultaneously ensuring the integrity of the data. Efficiency and security analysis show that the proposed scheme enhances efficiency without any security degradation.