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Economic Feasibility of Forest Biomass Thermal Energy Facility Using Real Option Approach (실물옵션법을 이용한 산림 바이오매스 열공급 시설의 투자 분석)

  • An, Hyunjin;Min, Kyungtaek
    • Journal of Korean Society of Forest Science
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    • v.110 no.3
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    • pp.453-461
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    • 2021
  • The energy use of forest biomass is crucial to deal with climate change and achieve the carbon-neutral goal. This study aims to analyze the economic feasibility of forest biomass thermal energy facilities and calculate the optimal subsidy level of heat supply to ensure continued operation of the facilities. To achieve this aim, the net present value approach (NPV) and call option price model are adopted considering wood chip price volatilities. The Forest Energy Self-Sufficient Village Project financed by Korea Forest Service is considered as the research case study. In our analysis, when 50% of the initial investment is given to the subsidies and RECs are applied to only power generation, NPV and IRR are both negative and the investment value using the real option model is also zero. We concluded that some heat subsidies should be acknowledged to keep the facilities operating. Besides, the simulation results reveal reliable economic values when the heating subsidy is priced at KRW 0.0248 per kcal.

Performance Analysis on Speed Quality of LTE-Maritime Considering Scenario of e-Navigation Service and the Modulation Coding Scheme(MCS) (이내비게이션 서비스 시나리오 및 변조코딩방식(MCS)을 고려한 초고속해상무선통신망(LTE-Maritime)의 전송속도 성능 분석)

  • Kim, Bu-Young;Shim, Woo-Seong
    • Journal of Navigation and Port Research
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    • v.45 no.6
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    • pp.360-365
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    • 2021
  • LTE-maritime, which was built as part of the Korean e-Navigation project, has been providing a service that meets the goal of establishing a network up to 100km from the coast since J anuary 31, 2021. To provide appropriate communication services for LTE-maritime from the perspective of real users, additional performance analysis of LTE-maritime is required considering service implementation, and efficient use of spectrum resources. This paper presents the requirement of transmission speed according to the e-Navigation service scenario, and available transmission speed based on LTE modulation coding scheme (MCS) according to sea-specific ship distribution scenario and frequency resource allocation, and is cross-analyzed with results of the sea test.

Developing Competency Model and Analyzing Competency Needs for Construction Manager in D Co., Ltd. (건설사업관리자 역량 모형 개발 및 역량 요구 분석: D사(社) 사례를 중심으로)

  • Kim, Dae-Young
    • Journal of vocational education research
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    • v.33 no.3
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    • pp.37-56
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    • 2014
  • The purpose of this study was to develop a competency model and analyze the competency needs for construction manager in D Co., Ltd.. The delphi method of 25 excellent construction managers working in D Co., Ltd. was used to develop a competency model. The results showed that there would be a construction manager competency model which consisted of 3 competency clusters, 11 competencies, and 60 key actions. Then the survey of 114 construction managers working in D Co., Ltd. was conducted to examine concurrent construct validity of the competency model for construction manager and to analyze construction managers' competency needs by using the Borich's formula and the Locus for Focus Model(LfFM). The results showed that construction managers perceived 'communication', 'risk management', 'goal orientation', 'customer orientation', and 'project management' as top five priorities of competencies for construction managers. Based upon the above results, some implications were suggested for developing construction managers' competencies and improving their performance.

A Study on Implementation and Deriving Future Tasks of 「The Korean National CCS Master Action Plan」 (「국가 CCS 종합추진계획」 이행점검 및 개선과제 도출 연구)

  • Cho, GaBi;Cho, Hayoung;Park, Noeon
    • Journal of Climate Change Research
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    • v.7 no.3
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    • pp.237-247
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    • 2016
  • Global warming caused by greenhouse gases is one of the foremost challenges in the international community. As an alternative to solve this problem, the importance of CCS (Carbon Capture and Storage) technology is increasing. However, due to the delay of European financial crisis recovery, some large-scale CCS projects were postponed. In turn, large-scale CCS projects in South Korea have not been launched as originally planned. Given these situations, it is important to review the latest R&D activities related to CCS in South Korea, and then adjust relevant national policy accordingly. The purpose of this study is to identify policy issues for the effective promotion of CCS technology in South Korea. Following the analysis of recent global trend on CCS policy, we evaluated the results and achievements from national CCS projects, which had been listed under the "Korean National CCS Master Action Plan (2010)". Especially, we tried to review the attainability for the original goal of each project. Through the present study, we identified the current status of CCS technology in South Korea and suggested efficient ways to be taken in order to increase efficiency in implementing national CCS policy in the future.

Spatiotemporal chronographical modeling of procurement and material flow for building projects

  • Francis, Adel;Miresco, Edmond;Le Meur, Erwan
    • Advances in Computational Design
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    • v.4 no.2
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    • pp.119-139
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    • 2019
  • Planning and management building projects should tackle the coordination of works and the management of limited spaces, traffic and supplies. Activities cannot be performed without the resources available and resources cannot be used beyond the capacity of workplaces. Otherwise, workspace congestion will negatively affect the flow of works. Better on-site management allows for substantial productivity improvements and cost savings. The procurement system should be able to manage a wider variety of materials and products of the required quality in order to have less stock, in less time, using less space, with less investment and avoiding multiple storage stations. The objective of this paper is to demonstrate the advantages of using the Chronographic modeling, by combining spatiotemporal technical scheduling with the 4D simulations, the Last Planner System and the Takt-time when modeling the construction of building projects. This paper work toward the aforementioned goal by examining the impact that material flow has on site occupancy. The proposed spatiotemporal model promotes efficient site use, defines optimal site-occupancy and workforce-rotation rates, minimizes intermediate stocks, and ensures a suitable procurement process. This paper study the material flow on the site and consider horizontal and vertical paths, traffic flows and appropriate means of transportation to ensure fluidity and safety. This paper contributes to the existing body of knowledge by linking execution and supply to the spatial and temporal aspects. The methodology compare the performance and procurement processes for the proposed Chronographic model with the Gantt-Precedence diagram. Two examples are presented to demonstrate the benefits of the proposed model and to validate the related concepts. This validation is designed to test the model's graphical ability to simulate construction and procurement.

How is the Social Problem-Solving R&D Done? (사회문제 해결형 연구개발은 어떻게 수행되는가?)

  • Song, Wichin;Seong, Ji-Eun
    • Journal of Science and Technology Studies
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    • v.18 no.3
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    • pp.255-289
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    • 2018
  • The social problem-solving R&D is different from the goal and process in comparison with research aimed at scientific excellence and industrial innovation. It pursues social values and active participation of the end-user civil society. In this study, we try to derive its characteristics by analyzing the cases that are evaluated as successful social problem solving R&D project. In order to analyse the social problem-solving R & D case, these four variables are selected; 1) social and technological planning for problem solving 2) participatory technological development 3) law, system and delivery system development for innovation deployment 4) scale-up of new R&D process. Those are important issues identified through case studies: 1) the tools and support services needed to carry out social and technical planning effectively, 2) the role of the Living Lab to coordinate opinions with experts and users, 3) the legislative and institutional improvement activities as important as technological development, 4) researcher's change through interaction with end user.

The Significance of the Narrative Failure of The Conjure Woman: A Black Author's Experiment on a Socio-ethical Literary Voice

  • Kim, EunHyoung
    • Journal of English Language & Literature
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    • v.55 no.6
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    • pp.1163-1191
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    • 2009
  • As many critics do, this article starts from the premise that Charles Waddell Chesnutt wrote The Conjure Woman with a distinct socio-ethical view to ameliorating white readers' racism. For this purpose of social activism, first, the author uses a racially submissive genre and narrator- antebellum plantation-dialect fiction and an old ex-slave Julius-in order to win the attention of white racists, who constituted the majority of the reading public of postbellum America. Chesnutt then allows this seemingly submissive ex-slave consecutively to wage narrative battles against a Northern white capitalist, John. This fiction's structure is thus based on interracial narrative conflict. Granted, the result of these narrative battles is Julius's defeat. Even though he sometimes has narrative success through his manipulation of either his white female auditor's sentimentalism or the white capitalist's racial prejudice, it does not lead to any fundamental change in the white audience members' awareness: John still regards Julius's tacitly reformoriented tales merely as nonsensical ghost stories invented by the absurd imagination of a subservient, entertaining, and exploitable black coachman. Admitting his defeat, Julius relinquishes his original goal of deterring John's capitalist exploitation of both racial Others and the natural environment of the South and finally decides to serve the economic power of white capitalism. This self-defeating conclusion, however, should not be identified with Chesnutt's failure as an author. Rather, it should be understood as an interim result of the black author's earnest experiment with literary media best suited to his reform project. In fact, this narrative failure reveals Chesnutt's accurate diagnosis of the postbellum literary world: a black voice is still feebly heard and even easily buried by the whites' capitalist ambition and consequently intensifying racism. Conclusively, Julius's narrative failure should be positively evaluated as Chesnutt's one step further in his gradual and lifelong progress to a narrative goopher effectively to engage whites' imagination and sympathy for a vision of equal interracial coexistence.

An Analysis of Inclusive Higher Education Policies in the UK and Australia (영국 및 호주의 고등교육 포용성 정책 비교 분석)

  • Chae, Jae-Eun;Ariunbold, Bolor
    • The Journal of the Korea Contents Association
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    • v.21 no.6
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    • pp.733-743
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    • 2021
  • This study aims to provide implications for the realization of the SDG goal for higher education through a comparative analysis of the UK and Australia's inclusive higher education policies. The cases of the UK and Australia were chosen for analysis since both countries have developed various policies to strengthen the inclusiveness of higher education since the early 2000s. The implications for the Korean government are as follows. First, it should approach the concept of underprivileged students by applying various categories such as 'race, region, and etc.,' not just for a category of income level. Second, it should enhance higher education opportunities for underprivileged students not only by expanding admission opportunities for them, but also by assisting them to adapt to college life and develop a student career. Third, it should provide underprivileged students with the customized support in consideration of their characteristics and merits. Finally, it should develop the "Inclusive Higher Education Project" which would help them complete higher education courses through regional partnerships.

Start Point Detection Method for Tracing the Injection Path of Steel Rebars (철근 사출 궤적 추적을 위한 시작지점 검출 방법)

  • Lee, Jun-Mock;Kang, Dae-Seong
    • The Journal of Korean Institute of Information Technology
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    • v.17 no.6
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    • pp.9-16
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    • 2019
  • Companies that want to improve their manufacturing processes have recently introduced the smart factory, which is particularly noticeable. The ultimate goal is to maximize the area of the smart factory that performs the process of the production facility completely with minimal manual control and to minimize errors of reasoning. This research is a part of a project for unmanned production, management, packaging, and delivery management and the detection of the start point of rebars to perform the automatic calibration of the rollers through the tracking of the automated facilities of unmanned production. It must meet the requirement to accurately track the position from the start point to the end point. In order to improve the tracking performance, it is important to set the accurate start point. However, the probability of tracking errors is high depending on environments such as illumination and dust through the conventional time-based detection method. In this paper, we propose a starting point detection method using the average brightness change of high speed IR camera to reduce the errors according to the environments, As a result, its performance is improved by more than 15%.

Characteristics of Non-point Pollution Runoff in Mandae, Gaa, and Jaun Districts and Evaluation of Reduction Projects (만대·가아·자운지구 비점오염 유출특성 분석 및 저감사업 평가)

  • Woo, Soo-Min;Kum, Dong-Hyuk;Hong, Eun-Mi;Lim, Kyoung-Jae;Shin, Min-Hwan
    • Journal of The Korean Society of Agricultural Engineers
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    • v.64 no.1
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    • pp.65-77
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    • 2022
  • Due to muddy water from the highland fields upstream of Soyangho Lake, the Mandae, Gaa, and Jawoon have been redesignated as NPS management areas. This study aims to evaluate the adequacy and supplementation points of the implementation plan by analyzing the operation status of muddy water generation and reduction facilities through on-site investigations by NPS management area to achieve the effective nonpoint pollution reduction goal in the implementation of the implementation plan established in 2020. The SS load calculated based on the survey results from July to October 2019 from 2017 showed a decreasen in 2019 compared to 2017. Both and the Jawoon were analyzed to have decreased. However, the amount of precipitation also decreased by about 27%, so it was judged that the effect of the reduction project was not significant. As a result of the detailed investigation of abatement facilities, about 86% of the 793 facilities installed in the management area were evaluated as 'good'. As a result of a detailed investigation by subwatersheds, subwatersheds 105 and 106 in the Mandae were analyzed as apprehensive subwatersheds. appeared to fall. In addition, it was analyzed that the effect of reducing muddy water in the Mandae district was insufficient due to the high ratio of leased farmers, lack of efforts to reduce turbid water in leased farmland, conversion to annual crops, and neglect of bare land. In the case of Gaa district, although the abatement facilities are concentrated in the upstream, muddy water was also found to be severe.