• Title/Summary/Keyword: Operational Environment

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광촉매 반응에 의한 환경호르몬 분해특성

  • 박재홍;안상우;장순웅
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2004.04a
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    • pp.358-361
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    • 2004
  • The photocatalytic degradation of Endocrine Discruptors, dibuthyl phthalate(DBP) has been investigated over TiO$_2$ photocatalysts irradiated with a ultraviolet (UV) light. The effect of operational parameters, i.e., reaction time, light intensity, pH and additive on the degradation rate of aqueous solution of Endocrine Discruptors has been examined. Results show that the employment of efficient photocatalysts and the selection of optimal operational parameters may lead to degradation of Endocrine Discruptors solutions.

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Optimized Operational Environment for Parallel TTLS Solver (병렬계산용 TTLS 알고리즘의 최적운용환경)

  • Kim, H.J.;Kim, Y.J.;Lee, J.G.
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.666-668
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    • 1988
  • A new tridiagonal Toeplitz linear system (TTLS) solver is proposed. The solver decomposes a strictly diagonally dominant TTLS equation into a number of subsystems using a limit convergent of an analytic solution of a continued fraction. Subsystem equations can be solved employing a modified Gaussian elimination method. The solver fully exploits parallelism. Optimized operational environment for the algorithm is discussed.

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A Rational Operation Scheduling for Operational Cost Saving in Cogeneration System for Paper Mill (제지공장용 열병합발전시스템의 운용비용절감을 위한 합리적 운전기법 수립)

  • Choi, Kwang-Beom;Lee, Jong-Beom
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1276-1278
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    • 1999
  • This paper proposed the optimal operational scheduling of cogeneration system for paper mill connected with several auxiliary devices. Auxiliary devices that include auxiliary boiler, waste boiler and sludge incinerator operate with multi-cogeneration system. Especially environment element was considered in objective function to solve environment problem. Electricity can be purchased through power system from utility. The proposed operational strategy on cogeneration system for paper mill to increase energy efficiency can be applied to the similar cogeneration system in industrial field.

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A Rational Operation Scheduling Using Genetic Algorithms on Cogeneration System for Paper Mill (제지공장용 열병합발전시스템에서 유전알고리즘을 이용한 합리적 운전계획 수립에 관한 연구)

  • Choi, Kwang-Beom;Lee, Jong-Beom;Jeong, Ji-Hoon
    • Proceedings of the KIEE Conference
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    • 1999.11b
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    • pp.291-293
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    • 1999
  • This paper proposed the optimal operational scheduling of cogeneration system for paper mill connected with several auxiliary devices. Auxiliary devices that include auxiliary boilers, waste heat boilers and sludge incinerators operate with multi-cogeneration systems. Especially environment element was considered in objective function to solve the environment problem. And GAs(Genetic Algorithms) was applied to optimize and to analyse nonlinear operational property of cogeneration system of paper mill connected with several auxiliary devices. C-language was used to GAs computation. Electricity can be purchased through power system from utility. The proposed operational strategy on cogeneration system for paper mill to increase energy efficiency can be applied to the similar cogeneration system of industrial field.

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Operational Hydrological Forecast for the Nakdong River Basin Using HSPF Watershed Model (HSPF 유역모델을 이용한 낙동강유역 실시간 수문 유출 예측)

  • Shin, Changmin;Na, Eunye;Lee, Eunjeong;Kim, Dukgil;Min, Joong-Hyuk
    • Journal of Korean Society on Water Environment
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    • v.29 no.2
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    • pp.212-222
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    • 2013
  • A watershed model was constructed using Hydrological Simulation Program Fortran to quantitatively predict the stream flows at major tributaries of Nakdong River basin, Korea. The entire basin was divided into 32 segments to effectively account for spatial variations in meteorological data and land segment parameter values of each tributary. The model was calibrated at ten tributaries including main stream of the river for a three-year period (2008 to 2010). The deviation values (Dv) of runoff volumes for operational stream flow forecasting for a six month period (2012.1.2 to 2012.6.29) at the ten tributaries ranged from -38.1 to 23.6%, which is on average 7.8% higher than those of runoff volumes for model calibration (-12.5 to 8.2%). The increased prediction errors were mainly from the uncertainties of numerical weather prediction modeling; nevertheless the stream flow forecasting results presented in this study were in a good agreement with the measured data.

A Study on Models of Data Consolidation Center for Multi-Organization in Public Sector (공공부문 다기관 통합전산센터 모형에 관한 연구)

  • Lim, Sung-Mook;Lee, Yeong-Jae
    • IE interfaces
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    • v.18 no.4
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    • pp.418-430
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    • 2005
  • We establish an efficient strategy for construction and operation of data consolidation center for multi-organization in public sector. First, we introduce important concepts on data consolidation center in public sector, and draw some success factors by analyzing several foreign and domestic cases. Second, we construct all the possible logical operational models of the center and investigate the properties and feasibility of the models. Third, we suggest a virtual operational environment for the two representative models selected by feasibility criteria among the possible logical models, and compare the two models in terms of operational cost. We also utilize AHP methodology to evaluate qualitative opinions on the two models from several experts in public information systems. As a result, we find the best alternative is the case in which all infrastructure and facilities for the center are provided by government, and common essential IT operations are integrated, associated data are consolidated and the whole operational work are outsourced to specialized IT operations service providers.

Empirical Investigation of the Relationship between the Operational Competence of Service Providers and the Use and Adoption of Mobile Commerce

  • Lee, Jung-Wan;Mendlinger, Samuel
    • Journal of Distribution Science
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    • v.9 no.2
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    • pp.5-12
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    • 2011
  • This study models the operational competence of mobile service providers as an endogenous factor that presumably impacts the mobile commerce (m-commerce) adoption of consumers and examines the relationship between the perceptions of consumers toward the operational performance of m-commerce providers and their m-commerce adoption likelihood. Quantitative research is applied with data collected from wireless Internet consumers in South Korea. The data is analyzed using factor analysis and structural equation modeling methods. The findings suggest that the operational competence of m-commerce providers is a significant antecedent to the m-commerce use and adoption of consumers in Korea. In this environment, the operational competence of mobile service providers in managing facilities, equipment, systems and technology plays a central role in enhancing m-commerce use and adoption. Based on the results, important managerial implications are discussed.

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Spatial Analysis on the Facility of Nature Environmental Conservation and Its Utilization (자연환경보전·이용시설의 공간조성 사례 분석)

  • Choi, Jaeyong;Park, So Hyun;Lee, Dong Kun
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.8 no.1
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    • pp.52-62
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    • 2005
  • The objectives of this research is searching for the improvement scheme of spacial use of the Nature Environmental Conservation and its Utilization Facility through the analysis of those existing facilities from the structural and operational view points. In this study, firstly, analysis is commencing with the distinction of lawful and operational concepts of Nature Environmental Conservation and its Utilization Facility. In law, the concept is defined as an individual facility, while practical use of the concept has been understood as a collective space itself. Secondly, frequency tables in regard to the duration of the construction, types of location and objectives, and facility numbers are prepared on the basis of 53 cases of completed and under construction facilities. Conclusively, through the comparisons of facilities of Korea, United Kingdom and Germany, the future considerations on the improvement of the facilities in light of structural and operational aspects has been recommended. In structural view, ecological conservation aspect should be considered from the planning stage of the facility. And at the operational stage, various considerations should be given to the employment of facility experts and development of educational programs respectively.

A Study of Environment & Bullet-Proof Capability Test Method for KLTV's Transparent Armour (한국형 전술차량 방탄유리 환경 및 방호력 시험 적용 기법 연구)

  • Park, Jinwon;Park, Youngchan;Kim, Seonjin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.1
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    • pp.69-73
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    • 2018
  • Korean-peacekeeper's transparent armors in Iraq showed delamination, cracking and clouding a decade ago. And there were also similar deterioration recurrences in KLTV during the operational test a few years ago. Also, the differences between operational capability & lab Bullet-proof test condition, and insufficiency of military protection spec resulted in incomplete bullet-proof results. Moreover, although so many ground weapon systems have been developed, there were not secure test & evaluation codes to verify transparent armoured glasses equal to advanced-overseas products. So in this study, first, environmental test codes were established that all tests should be carried out as the application of only one specimen with newly adopted thermal shock test instead of completing each test with different one. Second, protection standards were integrated through the analysis of global developed country's specifications and reinforced as adding to the real mock-up condition if vehicle's glasses are smaller than standard specimen. Hereby, by applying to test-codes which including actual operational & vehicular conditions, the gap between development test and operational environment was minimized.

A Study on Operational Efficiency Analysis on the Value of Chinese Shipping Companies

  • Cui, Lin-Lin;Choi, Jung-Suk
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.28 no.3
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    • pp.430-440
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    • 2022
  • Shipping companies are key components of the logistics industry, which is extremely significant in enhancing the country's comprehensive national power and promoting global trade development. In the context of the implementation of the new development pattern strategy in China and the impact of the global novel coronavirus (COVID-19), this paper takes 22 Chinese shipping listed companies as the research object and analyses the operational efficiency of them from 2011 to 2020 based on the Super-SBM DEA Model and Window DEA Model. Factors affecting the efficiency are further analyzed with the Tobit model. The research conclude that the operational efficiency of Chinese shipping companies as a whole shows a steady increase from 2011 to 2020. Although most of them are in a relatively ef ective operation state, fewer are absolutely effective companies. Besides efficiency among companies differs obviously, which indicates the potential of further improvement and promotion. What's more, factors such as current economic development level, enterprise size, human resources quality and enterprise turnover speed have significant positive correlation to the operation efficiency of Chinese shipping listed companies, which is significant to improve the operation efficiency of Chinese shipping companies.