• 제목/요약/키워드: Dominant Management Problem

검색결과 43건 처리시간 0.023초

GIS를 이용한 식생정보 통합관리시스템 구축 방안 (Construction of Vegetation Information Management System Using GIS)

  • 송지혜;강인준;홍순헌;박동현
    • 대한공간정보학회지
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    • 제22권4호
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    • pp.99-106
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    • 2014
  • 1960년대 이후 산업화와 도시화에 따른 무분별한 산림파괴로 인하여 산림 및 생태계가 급속도로 파괴되어왔다. 이에 따라 산림 및 생태계관리를 위하여 식생지도를 제작하기 위한 연구가 전 세계적으로 활발히 진행되어왔다. 우리나라 역시 1986년 제1차 자연생태계 전국조사를 시작으로 하여 현재 제4차 전국자연환경조사가 진행 중에 있으며, 1995년 이후 NGIS사업을 추진함으로써 환경부의 환경공간정보서비스를 통해 식생 관리를 위한 움직임이 활발히 진행되고 있다. 그러나 현재 환경부의 환경공간정보서비스를 통해 제공되는 식생 및 식물상 정보는 텍스트 기반의 우점 식생정보만 제공되고 있으며, 전국자연환경조사 중 일부 자료만 구축되고 나머지 정보는 구축되어 있지 않아 통합적인 식생자료를 관리하기 위한 시스템의 구축이 매우 시급한 실정이다. 따라서 본 연구에서는 환경공간정보서비스에서 제공하고 있는 식생정보의 구축 및 제공에 관한 문제점을 제시하고, 이를 해결하기 위한 방안으로써 식생정보 통합관리시스템의 구축 방안을 제시하였다. 그리고 보다 다양하고 정확한 분석과 계획수립, 의사결정지원을 위하여 관련 시스템과의 연계 구축을 통한 식생정보 활용방안을 제시하였다.

고정오염원의 응축성 먼지 배출량을 고려한 서울과 인천의 먼지 관리방안 (PM Management Methods Considering Condensable PM Emissions from Stationary Sources in Seoul and Incheon)

  • 이임학;최두성;고명진;박영권
    • 한국대기환경학회지
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    • 제33권4호
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    • pp.319-325
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    • 2017
  • In this study, the new particulate matter emissions considering condensable PM (CPM) of stationary pollutant sources were calculated to modify the CAPSS emissions based on only filterable PMs in Seoul and Incheon. When the new calculated emissions were compared to the existing filterable PM based emissions of local governments, different contribution patterns of emission sources were found. For example, the proportion of mobile sources was high when the filterable PM was considered; however, the contribution of non-industrial sources was dominant in Seoul when the emissions of CPM were considered. Also, the proportion of energy industrial combustion and manufacturing combustion sources was significant in Incheon when CPM emissions considered. Therefore, it seems to be much desirable to consider CPM emissions for determining adequate locations of collective energy facilities and manufacturing combustion facilities in the future. In addition, CPM should be considered to solve the dust problem nationwide. The emission analysis, diagnosis, prediction and countermeasures using CPM emissions should be appropriately performed.

Semi-distributed dynamic inter-cell interference coordination scheme for interference avoidance in heterogeneous networks

  • Padmaloshani, Palanisamy;Nirmala, Sivaraj
    • ETRI Journal
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    • 제42권2호
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    • pp.175-185
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    • 2020
  • Inter-cell interference (ICI) is a major problem in heterogeneous networks, such as two-tier femtocell (FC) networks, because it leads to poor cell-edge throughput and system capacity. Dynamic ICI coordination (ICIC) schemes, which do not require prior frequency planning, must be employed for interference avoidance in such networks. In contrast to existing dynamic ICIC schemes that focus on homogeneous network scenarios, we propose a novel semi-distributed dynamic ICIC scheme to mitigate interference in heterogeneous network scenarios. With the goal of maximizing the utility of individual users, two separate algorithms, namely the FC base station (FBS)-level algorithm and FC management system (FMS)-level algorithm, are employed to restrict resource usage by dominant interference-creating cells. The distributed functionality of the FBS-level algorithm and low computational complexity of the FMS-level algorithm are the main advantages of the proposed scheme. Simulation results demonstrate improvement in cell-edge performance with no impact on system capacity or user fairness, which confirms the effectiveness of the proposed scheme compared to static and semi-static ICIC schemes.

Identification of Vibrio species isolated from cultured olive flounder (Paralichthys olivaceus) in Jeju Island, South Korea

  • Sohn, Hanchang;Kim, Jeongeun;Jin, Changnam;Lee, Jehee
    • Fisheries and Aquatic Sciences
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    • 제22권7호
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    • pp.14.1-14.8
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    • 2019
  • Olive flounder (Paralichthys olivaceus) is the major species developed for aquaculture in South Korea. Over the long history of olive flounder aquaculture, complex and diverse diseases have been a major problem, negatively impacting industrial production. Vibriosis is a prolific disease which continuously damages olive flounder aquaculture. A bacterial disease survey was performed from January to June 2017 on 20 olive flounder farms on Jeju Island. A total of 1710 fish were sampled, and bacteria from the external and internal organs of 560 fish were collected. Bacterial strains were identified using 16 s rRNA sequencing. Twenty-seven species and 184 strains of Vibrio were isolated during this survey, and phylogenetic analysis was performed. Bacterial isolates were investigated for the distribution of pathogenic and non-pathogenic species, as well as bacterial presence in tested organs was characterized. V. gigantis and V. scophthalmi were the dominant non-pathogenic and pathogenic strains isolated during this survey, respectively. This study provides data on specific Vibrio spp. isolated from cultured olive flounder in an effort to provide direction for future research and inform aquaculture management practices.

COVID-19 상황에서 나타나는 재택근무자 테크노스트레스 모델에 관한 연구 (Confirmatory Study on Telecommuters TechnoStress Model Under COVID-19)

  • 김수형;이정우
    • 한국IT서비스학회지
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    • 제20권5호
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    • pp.55-71
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    • 2021
  • Technostress management is increasingly getting important as ICT advances and infiltrates every job and task. Especially with the advent of COVID-19, workers had to switch to teleworking utilizing ICT extensively. In this study, we developed a research model explaining antecedents and their impacts on technostress in telecommuting context, especially under the COVID-19 situation. The result revealed that techno-complexity, techno-invasion, and techno-overload are the dominant factors that affect the negative psychological responses in the COVID-19 situation. Among them, we found that techno-overload maintain the most significant influence. It is due to the lack of instant feedback on workload allocations in telework and the lack of adjustment period with the sudden shift to telecommuting. In the case of techno-complexity, employees seem to experience difficulty acquiring new technical skills. Finally, the techno-invasion came out significant, signifying the infiltration of working space by home-related activities. The emotion-focused coping strategy had a moderating effect. In contrast, the problem-focused coping strategy had no significant effect, indicating that an appropriate emotional coping strategy is more important for workers undergoing extreme changes in the work environment. Subsequently, practical and theoretical implications, limitations, and future research directions are discussed.

대구지역 안면골 골절의 임상역학적 연구 (Clinical Epidemiologic Study of Facial Bone Fractures in Daegu)

  • 권혁준;한준;김준형;정호윤;김종엽;윤신혁;송철홍;류민희;김용하;서만수
    • Archives of Plastic Surgery
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    • 제34권3호
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    • pp.365-370
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    • 2007
  • Purpose: There are many reports about facial bone fractures, but limited to retrospective data of a single hospital. Etiology and severity of the facial bone fracture have been changed and treatment method and materials have been advanced. In order to reflect those changes and provide up-to-date data of the facial bone fractures in Daegu, we gathered the data and analyzed the epidemiologic study. Methods: The medical records of 1058 fractures in 895 patients were gathered from 5 general hospitals in Daegu during last year and these data were analyzed by following parameters: age, sex, place of residence, occupation, cause of injury, time of injury, location of fracture, length of in-hospital stay, time of operation, treatment method, associated injury, complication. Statistical analysis was performed using the Chi-square test. Results: Most commonly involved age group was 20s(26%) and the sex ratio was 3.4:1(male predominance). Fractures were occurred more in unban and white-color workers. Among variable etiology of injury, traffic accident was the most common cause. Time of injury was heighest at 6 to 7 P.M., on Sunday, in July. Locations of fractures were following sequence: nasal, zygoma, mandible, orbit, maxilla. Mean length of in-hospital stay and time of operation after injury were 6.3 and 3.2 days, respectively. In treatment methods, operative methods were dominant than conservative management and general anesthesia were favored than local anesthesia. Associated injuries were noticed in 188 cases(21.2%) and complications were in 94 cases(8.9%) and among them, ocular problem were common. Conclusion: Compared to previous studies, mean age of occurrence was lowered and the etiologies showed age-specific pattern and reflected the change of lifestyle. In young age groups, sports injury, violence were more dominant and the other hand, traffic accident and fall were dominant in older groups.

시스템 다이내믹스의 CLD와 SFD의 일관성 및 타당성 개선에 관한 연구 (An Improvement of Coherence and Validity between CLD and SFD of System Dynamics)

  • 정재운;김현수
    • 디지털융복합연구
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    • 제12권6호
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    • pp.69-77
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    • 2014
  • 시스템 다이내믹스(SD)는 복잡계 이론 중의 하나로서 사회과학 분야에서 동태적 문제의 분석 및 정책(전략) 개발을 위한 컴퓨터 기반의 시뮬레이션 연구방법론으로 많은 관심을 받아 왔다. 하지만 지난 50여 년간 다양한 분야에서 이 방법론으로 만들어진 모형 중에는 아직 검증이 제대로 되지 않은 채 시스템다이내믹스의 구성이론을 대표하는 모형으로 활용되는 사례들이 있다. 이에 본 연구에서는 SD의 이론을 설명하는 데 자주 활용되는 인구 동태학 모형을 대상으로 인과적 피드백 구조와 지배적 피드백 루프의 추론 오류를 증명하고, 인과지도(causal loop diagram)와 저량-유량 다이어그램(stocks-and-flows diagram) 간의 일관성 강화 전략을 통해 기존 모형의 타당성을 개선하였다. 본 연구의 결과는 기존 시스템다이내믹스의 이론적 발전과 시스템다이내믹스를 활용한 정책 연구모형의 타당성 강화에 기여한다.

제조 공정 결함 탐지를 위한 MixMatch 기반 준지도학습 성능 분석 (Performance Analysis of MixMatch-Based Semi-Supervised Learning for Defect Detection in Manufacturing Processes)

  • 김예준;정예은;김용수
    • 산업경영시스템학회지
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    • 제46권4호
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    • pp.312-320
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    • 2023
  • Recently, there has been an increasing attempt to replace defect detection inspections in the manufacturing industry using deep learning techniques. However, obtaining substantial high-quality labeled data to enhance the performance of deep learning models entails economic and temporal constraints. As a solution for this problem, semi-supervised learning, using a limited amount of labeled data, has been gaining traction. This study assesses the effectiveness of semi-supervised learning in the defect detection process of manufacturing using the MixMatch algorithm. The MixMatch algorithm incorporates three dominant paradigms in the semi-supervised field: Consistency regularization, Entropy minimization, and Generic regularization. The performance of semi-supervised learning based on the MixMatch algorithm was compared with that of supervised learning using defect image data from the metal casting process. For the experiments, the ratio of labeled data was adjusted to 5%, 10%, 25%, and 50% of the total data. At a labeled data ratio of 5%, semi-supervised learning achieved a classification accuracy of 90.19%, outperforming supervised learning by approximately 22%p. At a 10% ratio, it surpassed supervised learning by around 8%p, achieving a 92.89% accuracy. These results demonstrate that semi-supervised learning can achieve significant outcomes even with a very limited amount of labeled data, suggesting its invaluable application in real-world research and industrial settings where labeled data is limited.

2015 개정 교육과정 중학교 기술·가정 교과서 '의복관리와 재활용' 관련 내용의 지속가능발전교육(ESD) 연관성 및 탐구적 성향 분석 (Analysis of ESD-Related Content in Clothing Management Unit of Technology and Home Economics Textbooks of 2015 Revised Curriculum)

  • 장다원;이윤정;이선영
    • 한국가정과교육학회지
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    • 제32권1호
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    • pp.89-105
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    • 2020
  • 본 연구는 2015 개정 기술·가정 교과서의 '의복관리와 재활용' 단원을 ESD의 측면에서 분석하여 '의복관리와 재활용' 단원과 ESD와의 연관성을 찾고자 하였으며, 지속가능한 의생활 교육에 대한 학생들의 수업 참여도를 높이고 실천적 행동을 이끌어내는데 중요한 요소인 교과서의 탐구성향을 분석하였다. 이를 위하여 먼저 유네스코 통영 지역전문센터(Regional Centers of Expertise on ESD, RCE) 출판물의 ESD 핵심내용을 준거로 '의복관리와 재활용' 단원의 학습내용을 사회·정치·문화적 관점, 환경적 관점, 경제적 관점에 따라 분석하였다. 또한 Romey의 탐구적 교과서 분석방법을 변형하여 '의복관리와 재활용' 단원의 본문문장, 그림 및 도표, 학습활동 등을 분석하였다. 그 결과, 사회·정치·문화적 관점에서는 안전과 건강 및 식품, 환경적 관점에서는 자연자원과 에너지, 환경문제, 경제적 관점에서는 지속가능한 생산과 소비에 대한 내용을 찾아볼 수 있었다. 따라서 '의복관리와 재활용' 단원의 ESD 내용은 환경적 관점에 치우쳐져 있어 세 관점이 균형을 이루는 교과서 개발이 필요할 것으로 보았다. 또한 모든 교과서가 사실이나 정의적인 내용이 많아 탐구능력의 개발 기회를 얻기 어려운 성향을 지닌 것으로 나타났다. '의복관리와 재활용' 단원의 탐구성향 분석값과 ESD 관련 내용을 비교한 결과, 학습자의 수업참여를 높이기 위하여 글의 결론 부분에 ESD 관련 내용을 반영하고, 학습활동의 내용으로 ESD 관련 주제를 다루는 것이 필요할 것으로 보았다.

Railway Governance and Power Structure in China

  • Lee, Jinjing
    • International Journal of Railway
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    • 제1권4호
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    • pp.129-133
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    • 2008
  • Over the last $15{\sim}20$years, many countries have adopted policies of railway privatization to keep up with increasing competition from road and air transport. Although each country and case has its own history, market characteristics, political context as well as administrative process, railway privatizations (including railway restructure, concession etc.) in the west usually are accompanied with the establishment of new regulatory regimes. Therefore, railway governance has been innovating towards an interaction of government, regulator, industry bodies, user groups, trade unions and other interested groups within the regulatory framework. However, it is not the case in China. Although China had seen a partial privatization in some branch lines and is experiencing a much larger-scale privatization by establishing joint-ventures to build and operate high-speed passenger lines and implementing an asset-based securitization program, administrative control still occupies absolutely dominant position in the railway governance in China. Ministry of Railway (MOR) acts as the administrator, operator as well as regulator. There is no national policy that clearly positions railway in the transportation network and clarifies the role of government in railway development. There is also little participation from interested groups in the railway policy making, pricing, service standard or safety matter. Railway in China is solely governed by the mere executive agency. Efficiency-focused economic perspective explanation is far from satisfaction. A wider research perspective from political and social regime is of great potential to better explain and solve the problem. In the west, separation and constrains of power had long been established as a fundamental rule. In addition to internal separation of political power(legislation, execution and jurisdiction), rise of corporation in the 19th century and association revolution in the 20th century greatly fostered the growth of economic and social power. Therefore, political, social and economic organizations cooperate and compete with each other, which leads to a balanced and resonable power structure. While in China, political power, mainly party-controlled administrative power has been keeping a dominated position since the time of plan economy. Although the economic reform promoted the growth of economic power of enterprises, it is still not strong enough to compete with political power. Furthermore, under rigid political control, social organizations usually are affiliated to government, independent social power is still too weak to function. So, duo to the limited and slow reform in political and social regime in China, there is an unbalanced power structure within which political power is dominant, economic power expanding while social power still absent. Totally different power structure in China determines the fundamental institutional environment of her railway privatization and governance. It is expected that the exploration of who act behind railway governance and their acting strength (a power theory) will present us a better picture of railway governance as a relevant transportation mode. The paper first examines the railway governance in China and preliminarily establishes a linkage between railway governance and its fundamental institutional environment, i.e. power structure in a specific country. Secondly, the reason why there is no national policy in China is explored in the view of political power. In China, legislative power is more symbolic while party-controlled administrative power dominates political process and plays a fundamental role in Chinese railway governance. And then, in the part three railway finance reform is analyzed in the view of economic power, esp. the relationship of political power and economic power.

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