• Journal of Bio-Environment Control
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• v.28 no.1
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• pp.28-37
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• 2019

We designed a system that can automatically collect, convey, and control cool air of $15^{\circ}C-20^{\circ}C$ containing carbon dioxide from a mushroom cultivation house to a strawberry plastic house. We recorded the temperature at various positions from July to August 2017. The average temperature of the green house during day and at night was maintained at $33^{\circ}C$ and $26^{\circ}C$, respectively. In the moveable three-tier cylindrical bed, the average temperature around root was maintained at $26^{\circ}C$ and $21^{\circ}C$ during day and at night, respectively. On the high-bench in the green house, the temperature was maintained at $32^{\circ}C$ and $30^{\circ}C$ during day and at night, respectively. The carbon dioxide concentration was maintained around 800-1,600 ppm in the mushroom cultivation system and 400-800 ppm in the strawberry plastic house. The growth characteristics of the strawberry treated with moveable three-tier cylindrical bed were significantly different from those of the untreated high-bench bed. In addition, during the summer season, moveable three-tier cylindrical bed showed more tendency to increase in normal fruit number (NFN) and to decrease in defective fruit number (DFN) compare to the high-bench bed. Therefore, the moveable three-tier cylindrical bed showed a tendency to be more than 2 times higher yields than that of the high-bench bed. It was confirmed that ever-bearing strawberry cultivars could be cultivated in green house due to the cool air supply from the mushroom cultivation system in the summer season.

• The Journal of Information Technology and Database
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• v.7 no.2
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• pp.1-15
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• 2000

The World-Wide-Web have many advantages as a front-end of database systems. Hence in Internet applications, such as E-Commerce systems, the requirements for Web-based database applications have been increasing. In this work we propose a framework for java-based Web database applications-JaWAF(Java-based Web Application Framework). JaWAF has the 3-tier architecture of Client/Server, and consists of database gateway, application server, and communication and message component. When this framework is applied to the database applications developments, it can provide advantages, such as ease understanding and fast implementations of the Web applications. Thus we can build 3-tier Web-based database application systems with high scalability and distributed processing capability. Database gateway in JaWAF works as a daemon process that connects to the database systems and waits for requests from clients, and supports state-oriented service between clients and database servers. Hence the performance of Web applications could be increasing.

• New & Renewable Energy
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• v.6 no.2
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• pp.12-18
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• 2010

This paper reviews commercial wind mapping services provided by the oversea consulting companies, AL-PRO and anemos in Germany, AWS Truepower and 3TIER in USA. They provide quick-to-use but essential dataset for a preliminary assessment before commencing an actual feasibility study for wind farm development. Details of wind mapping method, mapresolution, data extraction height, price and so forth are compared and fresh service contents such as site analysis report are drawn from the comparison. Despite its public service, the objective value of the Renewable Energy Resource Map System of Korea Instistute of Energy Research is also confirmed and it is anticipated that the drawn new content idea will be ported to the system to enrich its applicability.

• Proceedings of the Korea Association of Information Systems Conference
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• 2001.12a
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• pp.14-30
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• 2001

At present, EDI system is indispensable process in Port and e-logis industry. Using EDI system service has been variably applicable Client/Server system base on 2-Tier, Web EDI and skill oriented distribution object. Up to date, EDI System has been Closed. Moreover it raised several points on User. For settling the problem, A study make progress with Web EDI system, XML/EDl system, distribution object technology based on 3-Tier. This Study produce several EDI system and Service. With a Result of study as the central figure, All kinds of System and Service make a comparative study synthetically in port and e-logis industry. As a result of Study, this paper make an Model Construction Planning for estimating the Port EDI System.

• 한국IT서비스학회:학술대회논문집
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• 2002.06a
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• pp.381-386
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• 2002

급변하는 정보화 사회에서, 철도 물류 정보 분야는 업무 자동화에 대한 인식 부족, 데이터 실시간 처리 불가, 열악한 사용자 환경 등으로 인해 활성화되지 못하였다. 이러한 상황을 극복하기 위해 인터넷을 기반으로 하며 차세대 인터넷 표준으로 알려진 XML을 적용한 철도 물류 정보 연계 시스템을 구축하였다. 구축된 시스템은 기존의 철도 물류 정보 시스템의 기능과 성능을 개선하여 사용자에게 안정되고 편리한 서비스를 제공하기 위한 구조로 설계되었다. 또한 기존의 2-tier 형태의 WEB 구조를 3-tier 형태로 하여 보안이 강화된 구조로 하였으며, 새로운 인터넷 표준으로 각광받는 XML Schema와 XSL을 적용하여 앞서 나가는 철도 물류 정보 시스템이 되도록 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.57-59
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• 1999

온라인 네트워크 게임은 인터넷을 이용하여 동시에 수백명 이상이 접속하여 게임을 즐길 수 있으므로 초고속 통신망의 실현이후 고부가가치를 창출하는 미래 핵심 산업으로 각광받을 전망이다. 그러나, 서버에 접속하는 사용자의 수가 크게 증가함에 따라 나타나는 많은 문제점들이 발생하고 있다. 본 논문에서는 기존 네트웍 게임 서버의 구조적 단점을 보완한 3-tier 방식의 분산 네트웍 게임 서버를 설계하고 구현하였다. 이 시스템은 클라이언트/서버 모델의 2-tier방식을 적용한 서버에서 각 서버간의 통신, 데이터 공유에 대한 문제 등을 해결하기 위하여 3-tier바식을 적용하여 구현되었다. 또한 각 서버의 접속자나 이동되는 데이터를 모니터링하는 미들웨어 시스템을 구현하였다.

• Annual Conference of KIPS
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• 2002.04a
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• pp.427-430
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• 2002

기존의 2 Tier나 3 Tier형태의 소프트웨어 개발 시 생산성과 효율성을 향상시키기 위하여 RAD Tool을 많이 사용하였다. 이러한 RAD Tool의 사용은 생산성과 효율성을 향상 시켰지만 소프트웨어의 유지보수나 성능 개선을 위한 작업 시 코드의 중복이나 복잡성 등의 증가 등 많은 문제점들을 발생되었으며, 이는 소프트웨어의 유지보수에 많은 문제점을 가져왔다. 이러한 문제점들은 역공학 기법을 통해서 해결이 가능하다. 역공학 기법을 이용하여 소프트웨어의 구조를 이해할 수 있는 정보를 추출하고 추출된 정보를 체계적으로 관리할 수 있는 시스템을 구축하여 문서화하는 것이다. 이에 본 논문에서는 소프트웨어의 소스코드를 분석하여 시스템 변경 등의 작업 시 문서화를 지원하여 생산성과 효율성을 증가시킬 수 있는 시스템을 설계 구현하였다.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.33 no.1
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• pp.13-19
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• 2022

Vocal fold leukoplakia poses a challenge to otolaryngologists due to its various spectrum of pathologic diagnosis. The degree of dysplasia is associated with malignancy risk and the new 2017 WHO classification system changed from the 3-tier system to a 2-tier system consisting of low and high grades. Infections including candidiasis, cryptococcosis, and tuberculosis should also be included in the differential diagnosis. Efforts have been made to evaluate risks using endoscopic technologies such as narrow band imaging, and surgery is essential for histopathological diagnosis. Regarding management, it is important to make an accurate diagnosis and find a balance between oncologic safety and functional outcome.

• ETRI Journal
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• v.46 no.2
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• pp.263-276
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• 2024

Different diseases occur in the brain. For instance, hereditary and progressive diseases affect and degenerate the white matter. Although addressing, diagnosing, and treating complex abnormalities in the brain is challenging, different strategies have been presented with significant advances in medical research. With state-of-art developments in artificial intelligence, new techniques are being applied to brain magnetic resonance images. Deep learning has been recently used for the segmentation and classification of brain images. In this study, we classified normal and pathological brain images using pretrained deep models through transfer learning. The EfficientNet-B5 model reached the highest accuracy of 98.39% on real data, 91.96% on augmented data, and 100% on pathological data. To verify the reliability of the model, fivefold cross-validation and a two-tier cross-test were applied. The results suggest that the proposed method performs reasonably on the classification of brain magnetic resonance images.

• Journal of the Society of Disaster Information
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• v.15 no.4
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• pp.540-547
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• 2019

Purpose: This paper is for the improvement of the fire gate performance that occurs between the construction company and the residents. A survey was conducted on experts in the construction to prepare the causes and measures for the suit. Method: The application of the Analytic Hierarchy Process(AHP) resulted in the following conclusions. Results: TIn the 2nd tier, 28percent of the "strengthening standards for installation of fire prevention zones" included in the "institutional strengthening of stnadards" of the 1st tier had higher importance. In the 3rd tier, "strengthening the installation standards by floor area" and "strengthening the standard of fire-resistant structures" showed high importance. Conclusion: The results suggest that detailed legal criteria for detailed installation criteria with varying site conditions are needed.