• 대한안전경영과학회지
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• 제16권4호
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• pp.331-341
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• 2014

Internet of Thing(IoT), which is recently talked about with the development of information and communication technology, provides big data to all nodes such as companies and homes, means of transportation etc. by connecting all things with all people through the integrated global network and connecting all actual aspects of economic and social life with Internet of Thing through sensor and software. Defining Internet of Thing, it plays the role of a connector of providing various information required for the decision-making of companies in the cloud computing environment for the Insight usage by collecting and storing Raw Data of the production site through the sensor network and extracting big data in which data is accumulated and Insight through this. In addition, as the industry showing the largest linkage with other root industries among root industries, the mold industry is the core technology for controlling the quality and performance of the final product and realizing the commercialization of new industry such as new growth power industry etc. Recently, awareness on the mold industry is changing from the structure of being labor-intensive, relying on the experience of production workers and repeating modification without the concept of cost to technology-intensive, digitization, high intellectualization due to technology combination according to IT convergence. This study, therefore, is to provide a golden opportunity to increase the direct and indirect expected effects in poor management activities of small businesses by actually implementing and managing the entire process of mold life cycle to information system from mold planning to mass production and preservation by building SME(small and medium-sized enterprises)-type mold life cycle management information system in the cloud computing environment and applying it to the production site.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2006년도 추계학술발표대회 논문집
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• pp.366-369
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• 2006

Multi Housing design has not considered the remodeling even at the beginning of the construction. This severely hindered systematic maintenance, providing fundamental causes of consuming society. In general, in about 20 years when the buildings become too old, they are brought down or removed with a trail of waste left behind. In addition, since the current remodeling or future remodeling type is a general remodeling that leaves only a frame, some question the role of the remodeling as a solution to the reconstruction from economically and environmentally efficient aspects. This study intends to find a solution for long-life span multi-family housing design, promoting sequential remodeling by stating the life cycle of components. Problems were identified by analyzing joints, design and construction of multi-family housing based on the previous researches. Conclusion from characterization of the design plan according to joint parts can be summarized as the following firstly, the problem of the wet was seen in joints between the structure and a finishing materials and ones between separate finishing materials. Secondly, the problem of overlap was frequently seen in joints between the structure and a door/window, ones between a door/window and a finishing materials, and ones between a finishing materials and an electrical/mechanical device.

• 한국환경생물학회:학술대회논문집
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• 한국환경생물학회 2003년도 학술대회
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• pp.121-124
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• 2003

The goals of this study is to elucidate life cycle and to detect genetic differences within a single species of Heterosigma akashiwo. To elucidate life cycle of H. akashiwo, have to study of benthic stage and vegetative cell. So we studied identification of H. akashiwo cyst. The relative contents of DNA in nuclei were determined in Heterosigma akashiwo. Different stages of the life history were obtained from culture and natural sediments, and examined by microfluorometry after staining with the DNA-specific fluorochrome 4'-6-dianudubi-2-phenylindole(DAPI). Large cells mainly in exponensial stage, while small cell, pre-encystment cells(\ulcorner\ulcorner), showed in the end of the late growth stage. Type of DNA content showed the different with growth stage. Usually the small cell has the high level of IOD.

• 전기화학회지
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• 제6권4호
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• pp.242-249
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• 2003

아연 전극은 고농도의 KOH전해질 용액의 알카리 전지용 양극재료로 폭넓게 이용되고 있다. 그러나 급속한 전기화학적 반응과 높은 용해도에 의한 수지상의 생성에 의해 사이클 수명이 현저하게 짧아지는 것으로 알려져 있다. 본 연구에서는 용액온도 $25^{\circ}C$의 $40wt.\%$ KOH 전해질에 $Ca(OH)_2$, Citrate, Tartrate 및 Gluconate 등의 첨가제를 첨가하고 그리고 $Pb_3O_4\;5wt\%$를 아연 전극에 혼합하였을 때 아연 전극의 전기화학적 거동에 미치는 Pb,04와 첨가제의 효과를 동전위 분극 곡선, 순환전위전해분석법, 가속수명시험 및 SEM사진 분석을 통하여 고찰하였다. $Pb_3O_4$의 첨가는 아연 전극의 부식 속도를 확실히 감소시키는 효과가 있었으며 그리고 $Pb_3O_4$의 첨가에 의한 아연 전극의 부식 전위는 순수아연 전극에 비하여 다소 높았으나 개로 전압에는 거의 영향이 없었다. 그리고 4가지 종류의 첨가제는 내식성과 가속 수명시험시의 사이클 수명을 향상시키는 데 중요한 역할을 하고 있는 것으로 확인되었다. 더욱이 Tartrate 첨가는 4가지 종류의 첨가제 중에서 상대적으로 충방전 특성을 개선할 뿐 아니라 양호한 내식성 효과가 확인되었다.

• 한국기후변화학회지
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• 제9권4호
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• pp.319-324
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• 2018

Due to climate change, water shortages and water-related disasters will be serious. Since the damage and frequency of drought are increasing, the importance of water resource management technology is increasing. In this study, we analyzed the amount of greenhouse gas and the environmental impact caused by the production and operation system technologies of movable weir among various water resource management technologies. The research subjects were air inflatable rubber dams widely used in rivers and upright type rubber dams, which are an improvement on the existing rubber type. Each type of dam was studied at sizes of $1,500H{\times}10,000L\;mm$ and $3,000H{\times}20,000L\;mm$, and the two types and two sizes were compared and analyzed. Using life cycle assessment, we examined the environmental impacts using the amount of electricity required for operation and the discretionary amount required for production. In the '$1,500H{\times}10,000L$' dams, the global warming indexes were $9.35E+04kg\;CO_2-eq$. for upright type and $7.36E+04kg\;CO_2-eq$. for inflatable type. At size of '$3,000H{\times}20,000L$' the global warming indexes were $9.09E+05kg\;CO_2-eq$. for upright type and $1.07E+06kg\;CO_2-eq$. for inflatable type. Analysis of the life cycle environmental impact showed that the environmental impact of the air inflatable rubber dam was reduced by 39.8% at '$1,500H{\times}10,000L$' compared to the larger size. At the larger '$3,000H{\times}20,000L$' size, the upright dam showed a 10.1% smaller impact than the air inflatable rubber dam. Selection of water resource management system should consider climate change, not only management purpose and cost. Additional studies and improvements on rubber dam systems should be made.

• Smart Structures and Systems
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• 제16권4호
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• pp.743-758
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• 2015

This paper presents an advanced life cycle cost (LCC) analysis of a ground source heat pump (GSHP) system and suggests a smart operation mode with a thermal performance test (TPT) and an energy pile system constructed on the site of the Incheon International Airport (IIA). First, an economic analysis of the GSHP system was conducted for the second passenger terminal of the IIA considering actual influencing factors such as government support and the residual value of the equipment. The analysis results showed that the economic efficiency of the GSHP system could be increased owing to several influential factors. Second, a multiple regression analysis was conducted using different independent variables in order to analyze the influence indices with regard to the LCC results. Every independent index, in this case the initial construction cost, lifespan of the equipment, discount rate and the amount of price inflation can affect the LCC results. Third, a GSHP system using an energy pile was installed on the site of the construction laboratory institute of the IIA. TPTs of W-shape and spiral-coil-type GHEs were conducted in continuous and intermittent operation modes, respectively, prior to system operation of the energy pile. A cooling GSHP system in the energy pile was operated in both the continuous and intermittent modes, and the LCC was calculated. Furthermore, the smart operation mode and LCC were analyzed considering the application of a thermal storage tank.

• 정보교육학회논문지
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• 제17권3호
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• pp.357-365
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• 2013

본 논문의 목적은 4학년 과학 식물의 한살이 단원의 교육용 어플리케이션을 현재 교육과정에 기반을 두고 설계 및 구현하여, 교사가 수업과 과제활동에 직접적으로 편리하게 활용하고, 4학년 학생들의 식물 학습에 실질적인 도움을 주고자 하는 것이다. 이 어플리케이션을 활용하여 교사는 식물의 한살이 단원에서 오프라인 수업과 모바일 학습을 결합한 블렌디드 학습을 구현할 수 있고, 이를 통하여 학생들은 학교에서 배운 내용을 언제, 어디서든 복습하고, 어플리케이션을 이용하여 과제활동을 수행할 수 있다. 이와 같은 학습 방법은 학생들의 학습 동기를 증가시키고, 학습의 재미를 더하여 식물의 한살이 단원의 학습효과를 향상시킬 수 있을 것으로 기대된다.

• 동력기계공학회지
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• 제22권1호
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• pp.72-78
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• 2018

With growing concerns over air pollutions attributed to shipping activities, the international maritime organization has enacted a series of stringent regulations. In particular, MARPOL Annex IV Reg. 16 requires sulfur contents from exhaust gases of marine engines to be progressively reduced. To comply with this regulation, three feasible options have been introduced: using LNG as a marine fuel, using heavy fuel oil with the scrubber system, and using the marine gas oil (a type of low sulfur fuel oil). For the objectives of this paper, the holistic environmental impacts pertinent to these options were investigated and compared in ways that the flows of energy and emission were tracked and quantified through the life cycle of the ship. Research findings obtained from a case study with a large bulk carrier showed that the use of the scrubber system to purify heavy fuel oil would produce relatively fewer amounts of emissions attributing to global warming than other two options. On the other than, the use of LNG would be the way to operate the ship in a cleaner way in terms of reducing the acidification, eutrophication, and photochemical effects. Throughout the analysis, the excellence of life cycle assessment was proven to shift the environmental impact of marine systems from the short-term view to the long-term one.

• 한국태양에너지학회 논문집
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• 제24권3호
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• pp.101-109
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• 2004

This research investigates the life-cycle energy consumption of the windows used for the building's exterior cladding, and its environmental potential aspects by utilizing the LCA. The research scope has taken account of the entire life-cycle of the windows from the extraction of raw materials to its disposal, of which given sample building type is an apartment building. Results gained from the LCA of the windows as one of the steps in analysis reflects the current global interest and analysis trend towards the world's environmental issue on all fields of industry including the architectural industry, of which its newly established standards of architectural windows can further promote more environmentally sustainable factor compared to the previous analysis (focused more on energy efficiency assessment of the use stage).

• 설비공학논문집
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• 제28권3호
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• pp.103-109
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• 2016

The purpose of this study is to perform comparative economic evaluation for the systems of ground source heat pump (GSHP) and district heating and cooling (DHC) by focusing on the analysis of operation case of GSHP. The adapted research object is a public office building located in Seoul. The capacity of ground source pump is about 3,900 kW. Ground heat exchanger is closed loop type. The analysis period for life cycle cost is 30 years. Economic evaluation is assessed from the viewpoints of the following four parts: initial cost, energy cost, maintenance and replacement cost, and environment cost. The total life cycle cost of GSHP is approximately 8,447 million won. The cost of the DHC System is approximately 3,793 million won. The cost of the DHC is approximately 46% lower than GSHP system under the condition of current rate for GSHP and DHC.