• Ecology and Resilient Infrastructure
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• 제2권1호
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• pp.22-32
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• 2015

본 연구는 하천에서 격리된 구하도와 본류에서 어류 군집 구조의 차이를 비교하기 위하여, 만경강에서 2곳의 본류와 단절된 구하도를 선정하여 환경 요인과 어류 군집 구조를 조사하였다. 측정된 환경 자료를 이용하여 주요인분석을 실시한 결과, 구하도는 하상이 주로 진흙과 모래로 이루어졌고 식생 피도가 높은 반면 본류는 수로 폭이 넓고 하상이 왕자갈, 잔돌, 호박돌 등 다양한 하상구조를 보였고 용존산소 및 전기전도도가 높게 나타났다. 어류 자료를 사용하여 군집분석 결과, 구하도 군집과 본류 군집으로 뚜렷이 구분되었다. 구하도는 호소 및 소하천에 서식하는 어류 군집 구조가 나타났고, 본류는 강과 같은 대형하천에 서식하는 어류군집 구조를 나타냈다. 비모수다차원척도법 결과에 의하면 구하도에 분포하는 어류는 식생 피도와 높은 양의 상관관계를 가진 반면 본류에 분포한 어류는 용존산소, 전기전도도와 높은 상관관계를 보였다. 본 연구 결과, 구하도는 본류와의 연결성이 단절되면서 본류와 비교할 때 어류 서식 환경이 완전히 달라짐으로써 어류 군집 구조가 큰 차이를 보이고 어류의 산란처 및 은신처 기능도 상실한 것으로 판단되었다. 따라서 하천의 어류 생물다양성 증진을 위하여 구하도의 횡적 연결성을 복원하기 위한 노력이 필요하다.

• Ecology and Resilient Infrastructure
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• 제1권2호
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• pp.49-60
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• 2014

본 연구는 전형적인 자갈하천인 가평천에서 하천 환경과 서식처 교란이 어류 군집구조에 미치는 영향을 파악하기 위하여, 13개 조사지점에서 미국 환경청의 간편 생물평가법을 적용하여 하천환경을 평가하고 어류 군집구조를 조사하였다. 하천환경 평가 자료를 이용하여 주요인분석을 실시한 결과, 하상 경사와 관계가 있는 하상 서식환경, 유속/수심 체제, 유사 퇴적이 주요한 평가항목으로 판별되었다. 가평천에서 출현한 어종은 12과 46종이었고, 우점종이 참갈겨니 (Zacco koreanus), 아우점종이 피라미 (Z. platypus)이었다. 종별 개체수 자료를 사용하여 계층적 군집분석의 결과, 조사지는 상류, 중류 및 하류의 세 개의 집단으로 구분되었다. 비모수다차원척도법 결과에 의하면, 어류는 하천환경 평가 항목 중 하상 서식환경, 하상 매몰, 유속/수심 체제, 유사 퇴적, 하도 개수, 여울 빈도 항목과 유의한 상관관계가 있었다. 따라서 자갈하천인 가평천에서 어류 군집구조는 일차적으로 하상의 종적 환경 변화에 의하여 영향을 받고, 인위적 교란에 의하여 군집구조에 변화가 나타났다.

• 아동학회지
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• 제30권6호
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• pp.139-151
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• 2009

This study aimed to explore the current status of playgrounds, children's libraries and youth centers as local community centers in support of children. Its data were collected from reviewing the relevant literature, interviews, surveys and web search. It was found that children's libraries were predominantly located in Seoul and Kyungki provinces. In comparison with other advanced countries, Korea had lower ratios of volumes of books and periodicals per the library user and of a number of staff per the user. It was also found that over a half number of playgrounds was placed in apartment areas. Since 1993, the long-term youth development plan has commenced the construction of various societal infrastructure such as local youth centers, counseling institutes, sex-culture centers and youth cultural zones. Based on these findings, some policy issues were raised.

• Journal of Communications and Networks
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• 제8권4호
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• pp.432-441
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• 2006

As the community antenna television (CATV) networks becomes ubiquitous, instead of constructing an entirely new broadband network infrastructure, it has emerged as one of the rapid and economic technologies to interconnecting heterogeneous network to provide broadband access to subscribers. How to support ubiquitous real-time multimedia applications, especially in a heavy traffic environment, becomes a critical issue in modern CATV networks. In this paper, we propose a time guaranteed and efficient upstream minislots allocation algorithm for supporting quality-of-service (QoS) traffic over data over cable service interface specification (DOCSIS) CATV networks to fulfill the needs of realtime interactive services, such as video telephony, video on demand (VOD), distance learning, and so on. The proposed adaptive fast expansion algorithm and the loading statistics with dynamic swapping algorithm have been shown to perform better than that of the multimedia cable network system (MCNS) DOCSIS.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2017년도 춘계 종합학술대회 논문집
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• pp.459-460
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• 2017

The research proposes theoretical recommendations for Smart City that targets elderly citizens. The elderly citizens in question are people currently in their mid-50s to early 60s, in order to adequately employ futuristic technologies into four major sectors: healthcare, post-retirement employment, community-based governance, and environment-friendly infrastructure. The research concludes that the technical application of welfare to the elderlies through constructing a purposeful Smart City is desirable, environmental consideration should come in prior concern as a sustainable foundation.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.1363-1366
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• 2002

The studies of multi-hop wireless networks are active as the new communication media, which does not require any fixed communication infrastructure. One of application of the networks is local information distribution service, which is useful far daily activities in certain geographically restricted region or community within a radius of several kilometers. In this paper, MID-Net, which is the network enabling such distribution service, and effective information distribution algorithm MCMS are proposed. The behavior of the MID-Net is characterized by the waiting time function, three types of the functions are proposed in this paper.

• 기술사
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• 제46권2호
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• pp.24-27
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• 2013

Following the mobile era, the technical architecture and the software development environment of mobile system plat form has been explained, and the future development direction has been summarized in the 5 ways. Closed operating system can be developed in the certain period. However, because of the lack of maintenance of the development infrastructure, it has been met its limit. Android, which is open source mobile, will be greatly spread, As it is the age SNS(Social Network System), I will introduce cases apply to formal community which used Twitter, Facebook, and so on.

• 한국농공학회논문집
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• 제63권4호
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• pp.23-32
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• 2021

For agricultural water management, it is essential to establish the digital infrastructure data such as agricultural watershed, irrigated area and canal network in rural areas. Approximately 70,000 irrigation facilities in agricultural watershed, including reservoirs, pumping and draining stations, weirs, and tube wells have been installed in South Korea to enable the efficient management of agricultural water. The total length of irrigation and drainage canal network, important components of agricultural water supply, is 184,000 km. Major problem faced by irrigation facilities management is that these facilities are spread over an irrigated area at a low density and are difficult to access. In addition, the management of irrigation facilities suffers from missing or errors of spatial information and acquisition of limited range of data through direct survey. Therefore, it is necessary to establish and redefine accurate identification of irrigated areas and canal network using up-to-date high resolution images. In this study, previous existing data such as RIMS (Rural Infrastructure Management System), smart farm map, and land cover map were used to redefine irrigated area and canal network based on appropriate image data using satellite imagery, aerial imagery, and drone imagery. The results of the building the digital infrastructure in rural areas are expected to be utilized for efficient water allocation and planning, such as identifying areas of water shortage and monitoring spatiotemporal distribution of water supply by irrigated areas and irrigation canal network.

• 한국농공학회논문집
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• 제64권1호
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• pp.79-89
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• 2022

Soil moisture is significantly related to crop growth and plays an important role in irrigation management. To predict soil moisture, various process-based model has been developed and used in the world. Various models (Land surface model) may have different performance depending on the model parameters and structures that causes the different model output for the same modeling condition. In this study, the three land surface models (Noah Land Surface Model, Soil Water Atmosphere Plant, Community Land Model) were used to compare the model performance (soil moisture prediction) and develop the multi-model simulation. At first, the genetic algorithm was used to estimate the optimal soil parameters for each model, and the parameters were used to predict soil moisture in the study area. Then, we used the multi-model approach based on Bayesian model averaging (BMA). The results derived from this approach showed a better match to the measurements than the results from the original single land surface model. In addition, identifying the strengths and weaknesses of the single model and utilizing multi-model methods can help to increase the accuracy of soil moisture prediction.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.967-974
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• 2022

It is no news that Nigeria's infrastructure challenge is enormous. In the global ranking, Nigeria ranked low in quantity and quality of its infrastructural provision which has a great impact on the ease of business transaction. Low investments in transportation have brought about the current infrastructural deficit. Recently, the Nigerian government has made effort to address at least to some extent the infrastructural deficit through Public-Private Partnership, but this has not yielded the desired result. Moreover, the sustainability issues relating to railway projects such as, emissions, noise pollution, ecosystem, and other environmental issues calls for urgent attention. Hence, this necessitated consideration on sustainability appraisal for the Chinese rail project in Nigeria. This study reviews sustainability of railway projects built by the Chinese firm in Nigeria with particular emphasis on the environmental and social impact of these projects. The study further identified issues and challenges in project implementation with a particular focus on civil dialogue and community engagements. A detailed literature search was conducted on railway projects and infrastructure by systematically reviewing selected published articles.The analysis of the selected articles identified sustainability issues and potential for improvement of Chinese railway projects and how they contribute to or inhibit competitiveness in the Nigerian railway market. From the literature searched, some of the projects constructed by Chinese firm revealed that there is economic and social impact of railway projects delivered by the Chinese firm in terms of capacity development and knowledge transfer potentiality. For instance, in the just concluded Lagos-Ibadan railway projects, the study gathered that the project brought about 5000 jobs and local staff were trained by the Chinese company, this will boost man power and local content capability. Also, it will significantly improve Nigeria's infrastructure and boost its economic development. The study suggests that Nigerian government should ensure and provide an enabling environment that is conducive for investment on the continent. Peace, improved security, and decent governance are the best conditions for sustainable transportation growth.