• 한국IT서비스학회지
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• 제14권4호
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• pp.31-44
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• 2015

Local governments in Korea are involved in three types of online shopping sites : 'direct operation', 'outsourced operation', and 'sales agency.' They are different in terms of the site operator and the charging mechanism among a local government, the site operator, and local producers. This study analyzes their differences in site traffic, local producers' participation, promotion, and partnership. The results from the investigation of 72 shopping sites are the following. First, shopping sites of the 'direct operation' type and the 'outsourced operation' type show significantly higher participation of local producers. Second, the 'marketing agency' type has significantly higher number of promotional activities than the 'oursourced type' which has significantly higher number than the 'direct operation' type. Third, the number of partnerships in the 'marketing agency' type is the highest. The 'direct operation' type is the second and significantly higher than the 'outsourced type.' On the basis of the analysis results, this paper suggests an incubation ecosystem model as a better way of involvement by local governments in online shopping sites.

• 무역학회지
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• 제44권1호
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• pp.143-158
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• 2019

As the overseas direct purchase market grows rapidly, firms are setting up various strategic directions to attract consumers. However, many previous researches on this issue have focused on consumption behavior based on consumers' motivation and demographic factors, so there is a certain limit to suggest practical implications for firms. Therefore, this study proposed modeling to understand how firm's strategic direction influences consumers' acceptance behavior in order to overcome these limitations. For this purpose, this study conducted a survey on 357 domestic consumers and conducted empirical analysis through structural equation model analysis. As a result, the effort expectancy of overseas direct purchase site has a strong influence on consumer intention as much as performance expectancy. We also found that product variety had the strongest impact on performance expectancy and that web site reputation directly affected consumers' behavioral intention as well as purchasing behavior.

• 태양에너지
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• 제9권3호
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• pp.13-24
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• 1989

Direct and diffuse components of solar radiation were measured inside and outside a single-span plastic greenhouse. To analyze the direct solar radiation inside the plastic greenhouse, the cross-section of the greenhouse was assumed to be circular. Then the direct solar radiation transmitted into the greenhouse was calculated theoretically, and compared with the experimental measurements. The results are summarized as follows: (1) The transmissivities of total solar radiation were about 65% on cloudy days and 50% on clear days. For cloudy days, the transmissivity of the total solar radiation was regarded as the transmissivity of sky diffuse radiation. (2) The ratio of the inside effective scattered component of direct solar radiation to the diffuse radiation was 60-65%. (3) It appeared that the seasonal variation of the transmissivity of total solar radiation was adversely affected by the transmissivity of direct solar radiation and the effective scattered coefficient. But the effect of the transmissivity of direct solar radiation was dominant factor. (4) Computer simulation showed that the inside direct solar radiation was decreased as the floor of the plastic greenhouse was higher. (5) The predicted value of the inside direct solar radiation was 3.3% to 29.0% higher than the measured value.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 추계학술대회 논문집
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• pp.73-74
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• 2007

• Current Research on Agriculture and Life Sciences
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• 제18권
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• pp.33-42
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• 2000

A field case study was performed to investigate the effect of shallow ponding in paddy field on irrigation water requirement of direct seeded rice. In addition, an economic analysis was made to see the effect of no-till direct seeded rice on cost reduction. A field study was performed at a 2.1ha paddy field in Kimjae city, Chonbuk province from 1991 to 1999. Various direct seeding methods such as dryland seeding, wetland seeding, and no-till wetland seeding were introduced. Then, cost reductions due to the direct seeding and no-till were calculated. In addition, to investigate the effect of shallow ponding on irrigation water requirement, field measurements such as irrigation water volume, drainage water volume, rainfall depth, and ponding depth, were made at a 40a plot within the same area in 1988 and 1990. The results of the shallow ponding study showed that the irrigation water depth, rainfall, and the drainage depth were 379mm, 458mm, and 448mm in 1988 growing season, and 274mm, 819mm, and 736mm in 1990, respectively. The shallow ponding irrigation method saved irrigation water by about 20% with higher yield compared with the traditional method. The economic analysis showed that won \640,000 per ha can be saved by direct seeding due to no nursery cost, and \1,220,000 per ha due to no-till and no nursery cost. The yields ranged 540 to 640 kg per 10a during the study period with an average of 590kg per 10a. If these cropping techniques with no-till direct seeding and shallow ponding depth for rice cropping prove to be advantageous with further study, they can be adopted for the most of the paddy fields in Korea.

• 생물환경조절학회지
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• 제6권3호
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• pp.176-182
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• 1997

온실의 동방위 및 지붕경사각, 구조물의 재원, 설치 지역의 위도 등이 단동형 유리 온실내의 직달 및 산란일사 투과에 미치는 효과를 분석하고자 컴퓨터 시뮬레이션 모형이 개발되었다. 개발된 모형은 년중 일수, 온실의 방위 및 설치된 지점의 윈도, 지붕경사각이 서로 다른 단동 및 연동 온실에 대하여 적용할 수 있다. 본 연구에서 수행된 온실의 동방위가 온실내의 직달 및 산란일사 투과율에 미치는 영향에서 얻어진 결과를 요약하면 다음과 같다. 1. 단동의 유리온실에서 계산된 산란일사의 투과율은 60.4％로서, 동방위에 무관하게 일정한 값을 갖는 것으로 나타났다. 2. 겨울철에 직달일사의 투과율은 동서동에서 67∼69％ 정도이고, 남북동의 경우 51∼55％ 정도로서 동서동에서 14∼16％ 정도 높게 나타났다. 3. 여름철에 직달일사의 투과율은 동서동에 서보다 남북동에서 높게 나타났다. 4. 직달일사의 투과율에 미치는 국내 지역간의 차이는 거의 없는 것으로 나타났다.

• 한국산학기술학회논문지
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• 제17권10호
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• pp.39-45
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• 2016

본 연구는 친환경 농업부문 직불금의 지원이 농업부문 거시경제 지표에 어떠한 영향을 미쳤는지를 검토하기 위해 시행되었다. 이를 위해 농업부문을 일반농업과 친환경농업 부분으로 구분한 AGE(applied general equilibrium)모형을 이용하였다. 분석은 먼저 직불금 지원의 경제적 영향을 측정하기 위해 직불금 지급 이전의 상황을 기준으로 직불금이 지급된 몇 가지 상황을 시나리오로 설정하여 분석하였다. 즉 기준전망(baseline)은 직불금 지급 이전 상황, 시나리오 1은 직불금이 실제 수준으로 지급된 상황, 시나리오 2는 실제 직불금 보다 5% 추가 지원한 상황, 시나리오 3는 실제 직불금 보다 10% 추가 지원한 상황, 시나리오 4는 실제 수준 보다 15% 추가 지원한 상황, 시나리오 5는 실제 수준 보다 20% 추가 지원한 상황으로 설정하였다. 기준전망 및 시나리오에 대한 시뮬레이션 분석결과, 친환경 농업부문에 직불금의 투입으로 친환경 농업부문에 대한 고정자본 형성, 생산량, 노동생산성이 증대되었고, 이에 따른 노동력 대체효과로 친환경 농업부문 취업자는 다소 감소한 것으로 나타났다. 또한 친환경 농산물 가격은 직불금 투입 전후 큰 차이를 보이지 않은 것으로 분석되었는데 이는 공급 및 수요에 대한 가격탄력성이 비탄력적이고, 분석기간 동안 소비자들의 소득에 큰 변화가 없었기 때문에 나타난 현상으로 파악된다. 그러나 보다 더 정교한 분석을 위해 친환경 직불금의 투입에 따른 고정자본의 형성과 노동력의 대체 수준, 친환경 농업 및 농산물 관련 통계 자료의 보완에 따른 모형의 개선 등에 대해 향후 추가적인 연구가 이루어질 필요가 있다.

• 설비공학논문집
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• 제16권2호
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• pp.175-183
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• 2004

Performance of the water/air direct contact air conditioning system, in which heat and mass are directly transferred between air and water droplet, is simulated using semi-empirical method. Direct contact system improves transport efficiency compared to conventional indirect contact system. In this study, correlations for h$_{c}$A / c$_{pm}$ which represent the capacity of direct contact system are derived as a function of air and water flowrate from the experimental data. Cooling and heating performance of the water/air direct contact air conditioning system are evaluated using these correlations.ons.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권8호
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• pp.514-521
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• 2000

This paper presents a direct thrust control scheme for permanent magnet linear synchronous motor(PMLSM) by using digital signal processor(DSP). And a simulation method for the direct thrust control of a permanent magnet linear synchronous motor using the equivalent circuit is presented. The detent force that was obtained by cubic spline method is considered in the simulation. Thrust correction coefficient is utilized to estimate actual thrust on the direct thrust control, which considers the longitudinal end effect due to the finite core length of the permanent magnet linear synchronous motor. The motor self inductance, the initial flux linkage by the permanent magnet is calculated in advance by the finite element analysis, and then the direct control simulation is carried out. As the results, thrust, current and speed are shwon.

• 농촌지도와개발
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• 제27권3호
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• pp.125-134
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• 2020

The regional centrality plays a very important role in national and regional planning and it is measured by data such as people, goods, and information flows among regions. The inter-regional flows are usually considered by only direct flows, yet indirect flows, which are generated accordingly from direct flows, are not critically considered. Most centrality studies have also hardly reflected the indirect flow in the network analysis. This study demonstrates the significance of the indirect flows to enhance accuracy of the regional centrality. The nationwide dataset of inter-regional commuter traffic matrix is used in this study and analysed into two groups; one to consider only direct flow and the other both direct and indirect flows. The results indicate remarkable differences of centrality raking between two groups such as Yeongam of Jeonnam Province(+60th), Eumseong of Chungbuk Province(+57th), Gwacheon of Gyeonggi Province (-35th), and Nowon of Seoul (-32nd). It clearly shows the significant influence of indirect flow for regional centrality study. This also reveals regional centrality ranking in Korea by considering direct and indirect flows of commuters. Jung, Gangnam, and Jongno of Seoul are categorized in the highest rank group and Ulleung of Gyeongbuk, Ongjin of Incheon, and Jindo of Jeonnam are in the lowest group. The top group includes seven districts of Seoul, two of Busan, and one of Gyeonggi Province. The bottom group includes mostly island and costal areas. As this study shows an accurate method of centrality measurement, it has a significant implication to lead an effective regional planning.