• 한국건축시공학회지
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• 제11권3호
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• pp.265-275
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• 2011

건설 산업에서 BIM의 도입과 활용이 증가하면서 BIM모델의 작성과 관리, 납품, 품질검토 등에 대한 요구가 늘어나고 있다. 이를 위해서는 BIM과 관련된 각종 지침이나 기준, 매뉴얼, 가이드라인 등의 개발과 보급, 확산 등이 필요한 상황이다. 또한 BIM을 활용한 발주가 증가함에 따라 BIM모델에 대한 품질의 검증과 평가의 정량화에 대한 요구가 증대되고 있다, 이에 본 논문에서는 BIM의 품질에 대한 정의와 특징을 이해하고 BIM기준에 대한 국내외 현황을 파악하였으며, 특히 BIM의 품질과 관련된 내용을 중점적으로 조사, 분석함으로써 향후 BIM의 품질을 관리하는데 필요한 최소한의 기준을 설정하였다.

• 공학교육연구
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• 제20권4호
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• pp.21-27
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• 2017

The purpose of this study is to provide basic data and guideline to STEM(Science, Technology, Engineering, Mathematics) educators who prepare engineering education in elementary and secondary school. For this, this study develops a composition model for engineering education program of elementary and secondary school. To do this, a literature research, experts interview and Delphi survey were conducted. Through the literature research, we extracted the components of model for engineering education program of elementary and secondary school and then made a first draft of the model. The draft was revised by experts while Delphi survey was used to validate the model based on Delphi panels' opinions. The panels for the Delphi survey consisted of 51 experts in the STEM education field. The survey was conducted three different times and importance survey was included in the third stage. The conclusions of this study were as follows: First, the model consist of definition, 4 directions, 4 characteristics, 3 educational goals according to school level, educational contents area and element, teaching and learning method and evaluation method. The educational contents area and element consist of 2 major areas, 7 areas and 18 elements. Second, all components of the developed model were valid in most of the statistics such as mean, standard deviation, the degree of consensus and convergence, and CVR(Content Validity Ratio). Third, importance for education contents area and element according to the school level are analyzed.

• 한국가구학회지
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• 제28권4호
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• pp.371-379
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• 2017

This study established the scope of the main contents and interpretation of wooden product design using the CNC manufacturing technology as well as the basic concepts of which were defined, accordingly. After coming up with the definition of the CNC wood manufacturing technology from the academic point of view, a design study, using the practical CNC manufacturing technology, was conducted by analyzing and summarizing the contents of each process. In addition, data research and analysis including review on literatures and case studies of existing products were promoted besides design development through application of the design concepts, ergonomics, principle of molding, etc. Ultimately, this study suggested the step-by-step procedure in design drawing, 3D modeling, CAD/CAM data production, CNC manufacturing, and prototype completion together with figures. Through this, the study proposed a standard manufacturing guideline for wood product design using digital manufacturing technology. Base on such efforts, the advantages and points for improvement in product design using CNC manufacturing technology and the future direction of development were forwarded. Meanwhile, a prototype image that was developed through collaborative efforts between the academic circle and field workers was presented to help the case study on the wooden product design technique using CNC.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권9호
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• pp.4467-4486
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• 2016

Discrete cosine transform (DCT) based JPEG standard significantly improves the coding efficiency of image compression, but it is unacceptable event in serious blocking artifacts at low bit rate and low efficiency of high-definition image. In the light of all phase digital filtering theory, this paper proposes a novel transform based on discrete sine transform (DST), which is called all phase discrete sine biorthogonal transform (APDSBT). Applying APDSBT to JPEG scheme, the blocking artifacts are reduced significantly. The reconstructed image of APDSBT-JPEG is better than that of DCT-JPEG in terms of objective quality and subjective effect. For improving the efficiency of JPEG coding, the structure of JPEG is analyzed. We analyze key factors in design and evaluation of JPEG compression on the massive parallel graphics processing units (GPUs) using the compute unified device architecture (CUDA) programming model. Experimental results show that the maximum speedup ratio of parallel algorithm of APDSBT-JPEG can reach more than 100 times with a very low version GPU. Some new parallel strategies are illustrated in this paper for improving the performance of parallel algorithm. With the optimal strategy, the efficiency can be improved over 10%.

• 대한기계학회논문집A
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• 제21권3호
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• pp.430-438
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• 1997

Deburring and edge finishing technology as the final process of machining operation is required for manufacturing of advanced precise conponents. But, deburring is considered as a difficult problem on going to the high efficient production and automation in the FMS. Removal of burr couldn't have a standard of its definition because of its various shapes, dimensions and properties and mostly depends on manual treatment. Especially, deburring for cross hole inside is very difficult owing to its shape passing through out perpendicular to a main hole. The electrochemical method is suggested as its solution in practical aspect. Therefore, electrochemical deburring technology needs to be developed for the high efficiency and automation of internal deburring in the cross hole. In this study, the new process in the eliminating burr inside cross hole, electrochemical deburring by the wheel electroplated with Cubic-Boron-Nitrade abrasives, is suggested. Its deburring mechanism is described and machining performances is investigated. Also, CBN electroplated wheel is designed and manufactured and then characteristics of electrochemical deburring are investigated through experiments. Overall electrochemical deburring performance against burr inside cross hole is examined in the various power sources such as peak current and direct current.

• 한국지하수토양환경학회지:지하수토양환경
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• 제19권5호
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• pp.45-52
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• 2014

Torrefaction and hydrothermal carbonization (HTC) are productive methods to reclaim energy from lignocellulosic biomass. The hydrophobic, homogenized, energy dense and carbon rich solid fuel can be obtain from torrefaction and hydrothermal carbonization. Dead leaves were carbonized in a stainless steel reactor of volume 200 ml with torrefaction ($250-270^{\circ}C$) for 120 minutes and hydrothermal carbonization ($200-250^{\circ}C$) for 30 minutes, with mass yield solid fuel ranging from 57-70% and energy content from 16.81MJ/kg to 22.01 MJ/kg compare to the biomass. The char produced from torrefaction process possess high energy content than hydrothermal carbonization. The highest energy yield of 89.96% was obtained by torrefaction at $250^{\circ}C$. The energy densification ratio fluctuated in between 1.15 to 1.30. On the basis of pore size distribution of the chars, the definition of the International Union of Pure and Applied Chemistry (IUPAC) was used as a classification standard. The pore diameter was ranging within 11.09-19 nm which play important role in water holding capacity in soil. Larger pores can hold water and provide passage for small pores. Therefore, it can be concluded that high pore size char can be obtained my HTC process and high energy content char of 22.01 MJ/Kg with 34.04% increase in energy can be obtain by torrefaction process.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2002년도 학술대회지
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• pp.567-570
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• 2002

우리나라 학교건축은 1990년 중반 이후부터 교육환경의 개선을 위한 시설확충과 노후화된 교육시설물을 유지관리 하기 위한 각종 보수공사의 비용이 증가하고 있다. 교육시설사업을 유지하는 각 주체들간 업무를 수행함에 있어 정보의 분절과 검사방법의 판단기준이 미비하여 한정된 재원의 중복투자 및 낭비를 하고 있다. 따라서 업무절차에 따른 발생정보 및 요구정보를 명확하고 일관되게 제시할 필요성이 제기된다. 학교시설물을 유지 관리 하는 단계에서 이루어지는 업무를 파악하고, 교육청에서 이루어지는 업무를 중심으로 각 기능간 문제점 및 장애요인 분석을 통해 개선프로세스 모델을 제시하고자 한다. 향후 기능간 장애요인 추출을 통한 개선프로세스 모델과 정보 모델구축이 수행되어야 한다.

• 한국음향학회지
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• 제21권1호
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• pp.27-36
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• 2002

VoiceXML (Voice extensible Markup language)은 음성 대화를 웹의 마크업 언어로 기술할 수 있는 차세대 대화형 음성 서비스를 위한 표준이다. 현재 발표된 VoiceXML 1.0 사양은 음성대화의 기술에 초점을 두고 있으며, 음성 서비스의 시작 시점에 관해서는 언급이 없다. 본 논문에서는 사용자에 의해 시작하는 주문형 (on-demand) 음성 서비스 (inbound call) 뿐만 아니라, 최근에 고객관계관리 (CRM: Customer Relationship Management) 등에서 요구되는 시스템에 의한 푸쉬형 음성 서비스 (outbound call)가 가능한 VoiceXML 플랫폼을 설계하고 구현하였다. 또한, 본 논문에서는 W3C (World Wide Web Consortium)의 호 제어 요구사항 (Call Control Requirements)을 바탕으로 음성 대화 중에 팩스 송수신이 가능하도록 VoiceXML 문서형 정의 (UTD: Document Type Definition)를 확장하였다.

• 산업공학
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• 제17권3호
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• pp.330-337
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• 2004

Since XML (eXtensible Markup Language) was highlighted as an information interchange format, there is an increasing demand for incorporating XML with databases. Most of the approaches are focused on RDB (Relational Databases) because of legacy systems. But these approaches depend on the database system. Countless researches are being focused on DTD (Document Type Definition). However XML Schema is more comprehensive and efficient in many perspectives. We propose a meta-model for XML Schema that is independent of the database. There are three processes to build our meta-model: DOM (Document Object Model) tree analysis, object modeling and storing object into a fixed DB schema using model mapping approach. We propose four mapping rules for object modeling, which conform to the ODMG (Object Data Management Group) 3.0 standard. We expect that the model will be especially useful in building XML-based e-business applications.

• Journal of Advanced Marine Engineering and Technology
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• 제39권2호
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• pp.172-178
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• 2015

Constructing a bilingual multi-word lexicon is confronted with many difficulties such as an absence of a commonly accepted gold-standard dataset. Besides, in fact, there is no everybody's definition of what a multi-word unit is. In considering these problems, this paper evaluates and analyzes the context vector approach which is one of a novel alignment method of constructing bilingual lexicons from parallel corpora, by comparing with one of general methods. The approach builds context vectors for both source and target single-word units from two parallel corpora. To adapt the approach to multi-word units, we identify all multi-word candidates (namely noun phrases in this work) first, and then concatenate them into single-word units. As a result, therefore, we can use the context vector approach to satisfy our need for multi-word units. In our experimental results, the context vector approach has shown stronger performance over the other approach. The contribution of the paper is analyzing the various types of errors for the experimental results. For the future works, we will study the similarity measure that not only covers a multi-word unit itself but also covers its constituents.