• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권11호
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• pp.3083-3098
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• 2023

As demands for efficient and echo-friendly production of marine products increase, smart aquaculture based on information and communication technology (ICT) has become a promising trend. The smart aquaculture is expected to control fundamental farm environment variables including water temperature and dissolved oxygen (DO) levels with less human intervention. A recirculating aquaculture system (RAS) is required for the smart aquaculture which utilizes a purification tank to reuse water drained from the water tank while blocking the external environment. Elaborate water treatment should be considered to properly operate RAS. However, analyzing the water treatment performance is a challenging issue because fish farm circumstance continuously changes and recursively affects water fluidity. To handle this issue, we introduce computational fluid dynamics (CFD) aided water treatment analysis including water fluidity and the solid particles removal efficiency. We adopt RAS parameters widely used in the real aquaculture field to better reflect the real situation. The simulation results provide several indicators for users to check performance metrics when planning to select appropriate RAS without actually using it which costs a lot to operate.

• 한국환경교육학회지:환경교육
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• 제11권2호
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• pp.130-143
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• 1998

This study was conducted as a preliminary step to establish a model for the practical application of environmental education related to food wastes collected from elementary school foodservices. Methods of treatment and present recycling status of food wastes in elementary schools in Kyonggido were surveyed. The consciousness of dieticians who have been serving for elementary school foodservices was also analyzed through the survey questions concerning environmental education for the reduction and recycling of food wastes. The results derived from this survey were as follows: The major portion of food wastes from elementary school foodservices was constituted with vegetables and soup, and an average amount of food wastes per day was highest in June and July. Therefore environmental education related to reduction of wastes was needed in the first semester of school terms, and the possible reduction of food wastes achieved through the proper planning of school foodservice menu was also needed. In most cases food wastes were collected and treated by animal growing farmers or composted by machines in school. In operating composting machines microorganism inoculant was mostly used but dieticians pointed out the problem of a nasty odor, insects, and high energy consumption. This situation means it has not been operated efficiently and suggests an efficiency problem of machine composting in elementary schools because composting itself is based on the aerobic digestion and high temperature fermentation which kills insects and harmful microorganisms. Elementary school dieticians in Kyonggido were aware that food wastes cause main pollution problem, and that food wastes are valuable resources which can be recycled, and recycling of food wastes is inevitable. But more than half of the schools surveyed have not been reused food wastes in school, so a proper model for recycling and reuse of food wastes in school grounds was thought to be needed. Environmental education programs related to food wastes have not been peformed in more than half of the schools surveyed. It was concluded that the following three plans will be helpful to reduce school food wastes. First, environmental education should be enforced, second, teachers' and dieticians' intensive teaching concerning food wastes should be needed, and finally establishment of a model for recycling and reuse of food wastes in school grounds and its application to environmental education would offer a valuable field experience to school students.

• 한국환경복원기술학회지
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• 제9권1호
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• pp.112-120
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• 2006

It is possible to divide the historical changes of slope revegetation in Japan into five periods as follows; 1) The early period after creation(1927-1948), 2) The spreading period of modern revegetation work with manpower(1947-1958), 3) The spreading period of rapid revegetation technique using exotic grasses with machineries(1959-1985${\dots}$), 4) The spreading period of rapid reforestation technique by fast growing species mainly using leguminous shrub species(1986-1995${\dots}$), 5) The developing period of nature restoration technique using endemic arborous species(1996-). Recently main purpose of slope revegetation has been developing from the erosion protection to the nature restoration in the current of the 5th period. It is said that the role of the Japanese Society of Revegetation Technology(JSRT) is critical to the history of slope revegetation in Japan. 'The tentative guidelines of slope nature restoration' was announced by JSRT in 2004. In the guidelines, it was proposed that the planning techniques of using suitable seeds/plants based on the preservation level at the each construction sites. Moreover, the use of soil seed bank is the new and important study theme in the field of nature restoration. Consequently, at present the importance of advanced monitoring methods for vegetation maintenance and plant sociologic survey to evaluate the plant succession is increasing. Finally, some critical concepts are necessary to develop the field of restoration in Korea as follows; 1) monitoring of constructed sites, 2) ensuring of biodiversity, 3) recognition of slow revegetation and mosaic arrangement in revegetation, 4) reuse and recycle on the construction sites, and 5) promotion of specialist.

• 대한지역사회영양학회지
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• 제12권6호
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• pp.815-825
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• 2007

The study was designed to investigate food waste management practices and to identify factors affecting food waste generation at school food services. A total of 202 dietitians employed at elementary schools participated in the survey. The mean food waste weight per school was 77.54 kg, forty percent of the schools generated food waste of $50{\sim}100kg$ every day and 53% generated plate waste less than 50 kg. Three quarters of the dietitians perceived plate waste as a major component of the food waste and vegetable dishes were a major source of the plate waste. Half of the dietitians used a food waste pick-up service for waste disposal, which was the most preferred waste disposal method. Approximately 90% of the dietitians conducted education on plate waste reduction for students but their perceptions on the effectiveness of the education was inconsistent. The contents were environmental issues (70.3%) and unbalanced food choice (56.7%). According to factor analysis based on performance score, solid waste management practices were grouped into 'information collecting and education', 'supervision of production process', 'cooperation with related groups', and 'control over production planning'. Practices appertaining to 'cooperation with related groups', 'information collecting and education' factor need to be improved. Dietitians should pay attention to 'recycle and reuse of left over' practice. Waste generation differed significantly by dietitians' ages and working experience. In order to reduce plate waste, more effective education materials and methods need to be developed and support from principals, teachers, and parents is necessary.

• 한국정보과학회논문지:소프트웨어및응용
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• 제41권7호
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• pp.469-480
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• 2014

소프트웨어 제품라인은 제품들 간의 공통성 및 가변성을 전체 개발라이프사이클에 걸쳐 체계적으로 계획하고 재사용하여 생산성 향상, 비용절감, 시장적시성 향상을 꾀하는 소프트웨어 개발 패러다임이다. 소프트웨어 제품라인이 가져다 주는 이익을 최대화하기 위하여 시험은 도메인 공학과 어플리케이션 공학의 두 라이프사이클을 구성하는 프로세스들과 일관된 방식으로 통합되어야 하며, 더불어 시험 노력을 절감할 수 있어야 한다. 본 논문에서는 조합 시험 설계를 적용하여 제품라인 플랫폼을 시험할 시험항목을 생성함으로써 시험항목 개수를 상당히 줄이면서 동시에 재사용이 용이한 시험항목 생성을 지원하여 시험노력을 절감할 수 있는 조합 시험 설계를 이용한 제품라인 시험항목 생성 방법을 제안한다. 또한, 사례연구를 통하여 제안한 방법이 조합 설계를 이용하거나 그렇지 않은 기존의 다른 방법들 보다 효율적임을 보인다.

• 한국습지학회지
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• 제9권1호
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• pp.47-60
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• 2007

The rapid development of economy in China at the expense of consuming huge amount of energy and resources, water resource in particular, which has resulted in the production and discharge of increasing amount of wastewater to the water environment. In order to effectively control the increasing water pollution trend, the State Council has stipulated that all the cities with population over 500,000 should reach wastewater treatment rate of 60% by 2005, and all the cities should reach the rate of 60% by 2010, of which Capital Beijing and all the province capital cities and important tourism cities should reach 70% then. By the end of 2005, of the 661 cities in China, 393 have built and operated municipal wastewater treatments with a total number of 790 sets, total treatment capacity of $80.91{\times}106m^3/d$ and total treatment rate of > 48%. Other 73 cities have started the construction of municipal wastewater treatment plants, and other 168 cities have started to prepare, planning and design of wastewater treatment plants. Most of municipal wastewater treatment plants in big cities in China operate normally and perform well with good quality of effluent in terms of wastewater treatment train, but the sewage sludge treatment is usually poor with big problems. It has been found that the small scale WWTPs using activated sludge process in the towns are usually operated and maintained abnormally because of lack of fund, skilled operators and energy. It is therefore suggested that the small scale MWWTPs in small cities and towns adopt appropriate technologies, of which the most available ones are multi-stage ponds, constructed wetlands and the combination of them for further purification and reuse of treated wastewater.

• 한국건설관리학회논문집
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• 제12권1호
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• pp.133-140
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• 2011

지속가능한 발전을 추구하는 최근의 추세에서 해체산업은 자원의 재활용이나 재생측면에서 중요성이 더욱 커져가고 있다. 주택건립 및 기존주택현황을 고려할 때 해체시장의 규모는 계속 증가될 것으로 예측되고 있다. 따라서 지속가능한 발전을 위해서는 해체폐기단계에서 발생하는 건설폐기물을 정확히 예측하고 관리하는 것이 필요 하다. 그러나 해체업체의 규모가 영세하고 이에 대한 기술투자가 미비하여 이와 관련한 기준마련이나 시스템을 개발하기 위한 노력이 부족한 실정이다. 따라서 본 연구에서는 해체물량산정을 자동화하기 위한 시스템을 개발하고자 한다. 본 시스템은 해체공사와 관련된 모든 활동을 통합해서 해체공사의 기획, 물량산정, 폐기물처리, 재재활용계획을 한 시스템내에서 처리할 수 있도록 구성한다. 시각화 시스템은 2D 도면을 3D화하여 해체시설물을 입체화하고 공정관리툴과 연계하여 해체공정이 진행됨에 따라 실시간으로 관리할 수 있도록 구성한다. 해체물량산정 또한 3D Object 라이브러리화 하여 물량산정을 쉽게 할 수 있는 방안을 제시한다. 해체 물량의 정확한 산정과 예측은 건설폐기물관리에 많은 도움을 줄 수 있을 것으로 기대한다.

• 한국게임학회 논문지
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• 제9권6호
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• pp.69-77
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• 2009

게임사들은 제품 및 서비스 등을 수요자들에게 제공하지만 수요자의 욕구와 필요는 시대를 거듭하면서 다양하게 변하고 있다. 하지만 게임사들은 자본과 기술의 동일성 때문에 독특한 제품 및 서비스 등을 제공하기가 어렵다. 특히 유저들에게 인기 있는 FPS 게임은 유저들의 욕구를 최대한 반영하여 게임 개발에 임하지만 비슷한 욕구로 인해 타사 FPS 게임과 비슷한 게임으로 계속 개발되고 있다. 이는 특정 수요자의 욕구를 수용하지 못하고, 더 나아가 충성도가 높은 고객 감소 및 신규고객 미확보 등으로 시장 활동의 어려움에 빠질 수 있다. 따라서 본 연구에서는 FPS게임 이용자들이 게임이용 후 재이용 의도 및 전환의도에 미치는 요인들을 찾아내어 이용자의 심리적 욕구를 찾아내고자 한다. 그 결과 현재 이용하는 FPS 게임에 대해 만족 및 재이용 의도는 84.9%로 나타났고, 스페셜 포스 게임으로 전환의도는 9.6%로 서든어택 게임으로 전환의도는 5.5%로 나타났다. 이는 특정 게임 이용자들의 욕구가 변화하고 있음을 보여주고 있다.

• 정보처리학회논문지D
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• 제9D권6호
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• pp.1043-1054
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• 2002

본 논문은 국내 자동차산업을 대상으로 개발된 응용시스템으로, UML(Unified Modeling Language)을 이용한 XML(eXtensible Markup Language)기반의 안전한 전자조달(E-Procurement) 시스템을 제안하고 있다. 컴포넌트 개발기법인 UML 방법론의 활용으로 자동차산업의 구매업무 Workflow가 분석되었으며, XML 기반의 EDI(Electronic Data Interchange)와 전자서명 기능을 구현함으로써 기업간 구매업무를 자동화하는 효율적인 E-Procurement 시스템 프로토타입이 구현되었다. 또한 본 논문은 기존 정보공학방법론에서 한계로 지적되던 S/W의 재사용성과 Life Cycle의 위험을 줄인 컴포넌트 개발기법을 활용하고, 기업내 Legacy 시스템인 ERP와의 연동을 가능하게 하였다. 본 시스템은 기존 시스템이 제공하지 못하는 워크플로우(workflow)분석 및 설계, 컴포넌트 개발, 기업내부 시스템과의 연동, 그리고 전자문서의 무결성과 인증을 위한 XML 전자서명을 적용하는 해법을 제안하고 있다.

• 한국공간정보시스템학회 논문지
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• 제3권1호
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• pp.75-87
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• 2001

컴포넌트 소프트웨어의 가장 큰 장점은 응용 소프트웨어사이의 컴포넌트 재사용이다. 본 논문에서는 컴포넌트 재사용의 장점을 지리정보시스템 분야에 접목하여 지방자치단체에서 지리정보시스템을 빠르고 효과적으로 구축하기 위한 컴포넌트의 설계와 구현 방법을 설명하였다. 구현된 컴포넌트는 응용 서비스 컴포넌트로 부산시에서 1999년도에 수행한 사업과 1999년과 2000년에 개방형 GIS 컴포넌트 S/W 개발 과제의 결과물을 기반으로 지방자치단체에서 수행하는 서로 다른 업무 사이에 공통적으로 적용 가능한 기능을 도출하여 구현하였다. 분석 대상이 된 업무는 지방자치단체에서 지리정보시스템으로 구축하는 빈도가 높은 상수도관리 업무, 하수도 관리 업무, 도로 관리 업무, 도시 계획 업무, 지적 관리 업무이다. 분석 과정을 통하여 5개의 업무들 사이에 11개의 공통 기능을 추출하였으며 이 중 7개의 기능을 5개의 응용 서비스 컴포넌트로 구현하였다. 구현된 컴포넌트는 Authority, GISReport, MapService, SymbolManager, AttributeDisplay등 5개로써 사용자 관리, 측정, 검색, 출력, 인덱스 창, 심볼 관리, 속성 정보 표현, 출력 등의 기능을 수행한다.