• Title/Summary/Keyword: Electricity needs

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3차원 CAD 시스템을 이용한 설계환경 구축 및 설계자동화에 대한 연구 (A Study on Construction of Design Environment and Design Automation Using 3D CAD System)

  • 김영일;전차수
    • 한국CDE학회논문집
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    • 제13권2호
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    • pp.139-152
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    • 2008
  • In order to survive worldwide competition, today's industries are experiencing strong pressure to introduce higher quality products with lower cost and shorter lead-time. Therefore, the role of design in the process of product development is increasing in significance. In this research, two methods for improving the design capability are proposed: construction of design environment and design automation using 3D CAD system. The designers and design process are the core of product design using 3D CAD system. In order to maximize the design performance, construction of the design environment including selection of a suitable system, designer training for best use of the system, establishment of an efficient design process, and stabilization of the environment are required. A method is suggested to construct design environment by systematizing the contents of the projects and consulting experiences carried out for various categories of business such as electronic devices, motorcycles, electricity parts, sanitary wares, injection molds, and die casing molds. Design automation helps reduce tedious and time-consuming jobs, simplify complicated and error-prone modeling and drawing works to shorten the lead time and improve the product quality. To develop a design automation system, understanding the process and the related knowledge on design are very important before implementing the system using API provided by 3D CAD system. In this research, an eight-step procedure is proposed for the development of a design automation system. These eight steps are analysis of needs, determination of specification, verification of specification using 3D CAD system, inspection of related API functions, programming, field test, application in practice, and maintenance. A case study in which five design automation systems in the design of turbine generators using the proposed method is introduced in detail. These systems play important roles in the generation of various output items including 3D models, drafts, material information, and NC data. The case study shows how effectively the design time is reduced and the quality improved using those systems.

저역통과 FIR필터를 이용한 저잡음 전류 센서 구현 (Implementation of Low Noise Current Sensor using Low Pass FIR Filter)

  • 김정환;이성진;최용건;한성계;권세익;김남호
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2017년도 춘계학술대회
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    • pp.499-502
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    • 2017
  • 전력의 효율적인 사용과 전기 안전(electrical Safety)을 위한 전류 측정에 대한 요구가 늘고 있다. 이에 전류 센서가 사용되며, 특히 홀 효과(hall effect)를 이용하여 회로를 차단하지 않고 전류를 측정할 수 있는 비접촉식 전류 센서가 많이 사용되고 있다. 하지만 이러한 전류 센서에는 다양한 잡음 등의 유입으로 인하여 전류 센서의 정확한 측정을 방해한다. 본 논문은 기존의 전류 센서에 저역통과 FIR필터를 사용하여, 보다 잡음에 강인한 전류 센서를 제안한다. 전류 센서의 출력단에 일정 주파수 이상의 영역을 차단하는 FIR필터를 설계하여 외부 잡음 등을 제거하였으며, 그 결과 기존 전류센서 보다 정확하고 정밀한 측정을 할 수 있었다.

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생애구술을 통해 본 중국 할빈지역 조선족의 주거의 사용 - 주거의 사용과 생활문화의 동화 및 문화접변을 중심으로 - (Use of Housing through Oral Life History of Korean Chineses in Harbin, China - Focused on use of housing, cultural assimilation and acculturation -)

  • 홍형옥
    • 가정과삶의질연구
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    • 제28권6호
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    • pp.81-94
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    • 2010
  • This qualitative research was designed to explore the use of housing among Korean Chinese people in Harbin, China. Focusing on the use which based on the epistemology of housing adjustment, this was particularly designed to examine its cultural assimilation and acculturation on the way of life course, it employed the in-depth interview on the oral history of 5 interviewees in their 60s and 70s, individualized interviews were conducted from May 28 to 31 in 2010. Key findings were summarized as follows; 1. The free market reform in China resulted in privatization that allowed respondents to become homeowners, and the ownership was viewed as part of family asset centered upon a sense of solidarity. 2. Although homeowners in multi-story houses were responsible to decorate interior spaces, the common features in using interior spaces were found: entrance had no thresholds; kitchen was small, lack of storage cabinets, tile-flooring; washers were installed inside bathroom; and newly built apartment didn't have proper space to store Korean fermented foods. It was observed that housing adaptation outweighed housing adjustment. Those who used to live in Chinese houses with indoor-wearing-shoes or Russian houses with indoor-wearing-slippers were receptive to the use of dining table and bed, and the community heating system discouraged the use of individual electric water heater because of high electricity cost. 3. In daily life, eating habit wasn't much changed to the Chinese style, meals were shared, dish sterilizer was popular, and Kimchi fridge wasn't used. Because of the influence of the Chinese culture, such Korean traditions as ancestral rites and bedroom allocation tradition faded away, but traditional family values remained unchanged. In conclusion, Korean Chinese people experience normative housing deficits and adaptation selectively incurred. It's implied that residential design meets the needs resulting from the dual culture in terms of cultural assimilation and acculturation.

유틸리티 플랜트 모터/ 터빈 공정의 최적운전 (Optimal Operation of Motor/Turbine Processes in Utility Plant)

  • 오상훈;여영구
    • Korean Chemical Engineering Research
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    • 제45권3호
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    • pp.234-241
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    • 2007
  • 공장의 안정적인 운전과 경제성을 위해서는 유틸리티의 수급을 정확히 파악하고 공급하는 것이 중요하다. 모터/터빈 공정은 유틸리티 플랜트에서 수증기와 전력의 균형을 조절하여 주며 이의 최적 운전은 유틸리티 플랜트의 경제성에 지대한 영향을 미친다. 모터/터빈 공정의 분석을 위해서는 먼저 수증기 발생장치와 수증기 분배장치 전반에 대한 모델의 규명이 요구됨은 물론 제반 상황에 대한 운전지식이 필요하다. 유틸리티 관련 장치의 모델과 운전지식 베이스를 기반으로 구성되는 모터/터빈 운전 최적화 시스템에서는 다양한 등급의 수증기 헤더에서 요구되는 수증기 양이 변할 때 각 유틸리티 설비의 최적 운전조건을 제시하여 주며 수증기 요구량의 변화에 따라 유틸리티 펌프의 구동원이 적절하게 선택되고 이에 따라 전체 유틸리티 플랜트의 조업 경비도 절감할 수 있다.

몽골에서의 지열 시스템 적용을 위한 주택 에너지분석 (Analysis on Housing Energy for Applying Geothermal System in Mongolia)

  • 김진호;김중헌;신승호
    • 한국지열·수열에너지학회논문집
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    • 제10권2호
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    • pp.19-23
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    • 2014
  • In the capital of Mongolia where the air quality is getting worse due to the coal consumption used for electricity generation and district heating, the application of geothermal systems in the housing sector is recently designed for high class resort. In this study, the case of applying a geothermal system in a house in Mongolia is examined. The effects of passive house design on the needed heat pump capacity, as well as the annual energy consumption are analyzed. Moreover, as the initial costs, except labor fee, are assumed similar to Korea, cost analysis for several cases is examined, too. From the results, if a house is designed according to passive house standard instead of ASHRAE standard, the heat pump capacity can be expected to be reduced from 16 to 5~6 RT. Furthermore, although the initial cost of architectural cost might increased by 29 M\, the total initial cost is reduced by 14 M\, while the annual energy consumption is reduced by 14%. This is mainly driven by the fact that the geothermal system which serves as the main system to cover the building needs, with a high initial cost for fulfilling the peak requirements.

발전 설비 지속 가능 운영 기술 연구 (A Study of the Sustainable Operation Technologies in the Power Plant Facilities)

  • 이창열;박길주;김태환;구영현;이성일
    • 한국재난정보학회 논문집
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    • 제16권4호
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    • pp.842-848
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    • 2020
  • 연구목적: 노후화된 발전기의 지속 가능한 운영을 위하여 효율적이며, 안전한 운영이 중요하다. 효율적 운영이란 경제적 관점이며, 안전한 운영은 발전 설비의 치명적 사고 발생에 대한 발생 이전의 사전 조치를 말한다. 그러므로 발전기의 지속가능 운영 모니터링을 위하여 관련된 센서 설치와 이를 기반으로 지속 가능에 대한 예측할 수 있는 모델에 대한 연구가 필요하다. 연구방법: 전기와 열에 대한 수요 예측, 엔진의 성능과 이상을 탐지하는 예측, 그리고 재 난 안전에 대한 예측 모델을 제시하였다. 이를 위하여 필요한 센서를 정의하였으며, 이를 기반으로 예측 모델을 각각 개발하여 수행하였다. 연구결과: 수요 예측 모델은 기존의 79%에서 90% 이상으로 예측 정확도를 향상시켰으며, 다른 2개 모델도 시스템의 지속가능한 안정적 운영을 지원하였다. 결론: 노후화된 발전설비의 지속가능 운영을 지원하기 위한 3가지 종류의 예측 모델을 개발하고 이를 제이비주식회사의 발전 설비에 실제 적용하여 운영하고 있다.

엔진 없이 전기로 구동되는 자동차의 가상 엔진 음 구현을 위한 음원합성 IC에 관한 연구 (The study of sound source synthesis IC to realize the virtual engine sound of a car powered by electricity without an engine)

  • 구재을;홍재규;송영욱;이기창
    • 한국음향학회지
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    • 제40권6호
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    • pp.571-577
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    • 2021
  • 본 연구는 기존의 엔진 없이 전기로 운행되는 자동차에 가상의 엔진소리를 구현해주는 반도체 에 관한 연구로, 운전자의 욕구 및 보행자의 안전을 지키기 위해 Adaptive Difference PCM(ADPCM) 방식과 Frequency modulation 방식을 조합하여 생생한 엔진음을 구현하였다. 또한 미디를 응용하는 전자음 합성 알고리즘을 제안하여 엔진음 합성방법, 엔진음 발생 시스템의 구성 모델을 제시한다. 본 연구는 운전자와 보행자를 모두 만족시키기 위해 캔 통신을 이용하여 운전자의 운전 습관에 따라 전해지는 엔진회전량, 차량 속도, 가속 페달 눌림 량, 토크 등의 정보를 받은 후, 미리 설정된 적절한 파라미터에 따라 주파수 변조를 위한 인터폴레이션, 정보량 축소를 위하 ADPCM 알고리즘, 엔진음을 쉽게 만들기 위한 미디 포맷을 이용하여 시스템과 운전자의 의도를 정확히 반영할 수 있는 인터렉션 알고리즘을 구현하였다.

건축 WBS 위계 분석을 통한 소방 IFC 스키마 확장 방법론에 관한 연구 (Methodology of Fire Safety IFC Schema Extension through Architectural WBS Hierarchy Analysis)

  • 김태훈;원정혜;홍순민;추승연
    • 한국BIM학회 논문집
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    • 제12권4호
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    • pp.70-79
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    • 2022
  • As BIM(Building Information Modeling) technology advances in architecture around the world, projects and industries using BIM are increasing. Unlike previous developments that were limited to buildings, BIM is now spreading to other fields such as civil engineering and electricity. In architecture, BIM is used in the entire process from design to maintenance of a building, and IFC(Industry Foundation Classes), a neutral format with interoperability, is used as an open BIM format. Since firefighting requires intuitive 3D models for evacuation and fire simulations, BIM models are desirable. However, due to the BIM model, which was developed centered on building objects, there are no objects and specific properties for fire evacuation in the IFC scheme. Therefore, in this study, when adding a new object in the firefighting area to the IFC schema, the IFC interoperability is not broken and the building WBS(Work Breakdown Structure) is analyzed with a hierarchical system similar to the IFC format to define the scope for a new object and the firefighting part within of the building WBS to derive a firefighting HBS(Hierarchy Breakdown Structure) with the extension of the object-oriented IFC file. And according to HBS, we propose an IFC schema extension method. It is a methodology that allows BIM users to instantly adapt the IFC schema to their needs. Accordingly, the methodology derived from this study is expected to be expanded in various areas to minimize information loss from IFC. In the future, we will apply the IFC extension methodology to the actual development process using HBS to verify that it is actually applicable within the IFC schema.

한국 RE100 제도에서 녹색프리미엄의 특성 및 한계 (Characteristics and Limitations of Green Premium in the Korean RE100 System)

  • 양원창;이재승
    • 신재생에너지
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    • 제18권3호
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    • pp.43-59
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    • 2022
  • The green premium is the most important feature of Korea's RE100 system. Green premium has three characteristics. The first, the cost of implementation is lower than that of other means of implementation. The second, it is linked with the RPS system to keep the means of implementing the green premium low. Third, the funds raised by the green premium are used to supply renewable energy to compensate for the additionality that the green premium does not have. When the entire industrial sector's electricity consumption is converted to renewable energy, the implementation cost of the green premium is estimated to be 3,377.4 billion won, and the REC purchase is estimated to incur the implementation cost of 6,576.4 billion won, which is 3.5 trillion more than the green premium. It was analyzed that an additional implementation cost of KRW 100 million would occur. In addition, in the case of solar PPA, it was analyzed that additional implementation costs of KRW 13,375.7 billion to KRW 16,162.3 billion were incurred. It was estimated that the renewable energy that could be supplied to the green premium would at least be sufficient for companies exporting to the US and EU. In addition, it was analyzed that when the fund created as a green premium is used for renewable energy supply, about 30.7% of the renewable energy supply through PPA can be supplied. However, as ESG is emphasized, green premium can be criticized by green washing because there is no additionality. There is also a limit to responding to the EU's CBAM. Therefore, companies can use the green premium depending on the situation, but it is more advantageous to use PPA, etc. The government needs to sufficiently maintain the supply of renewable energy using the fund to maintain the green premium.

전력변환장치 캐비넷에서의 내부발열 개선을 위한 열유동 분석 및 유통안전성 향상을 위한 진동특성 분석 (Theoretical Heat Flow Analysis and Vibration Characteristics During Transportation of PCS(Power Conversion System) for Reliability)

  • 주민정;서상욱;오재영;정현모;박종민
    • 한국포장학회지
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    • 제28권2호
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    • pp.143-149
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    • 2022
  • PCS needs to freely switch AC and DC to connect the battery, external AC loads and renewable energy in both directions for energy efficiency. Whenever converting happens, power loss inevitably occurs. Minimization of the power loss to save electricity and convert it for usage is a very critical function in PCS. PCS plays an important role in the ESS(Energy Storage System) but the importance of stabilizing semiconductors on PCB(Printed Circuit Board) should be empathized with a risk of failure such as a fire explosion. In this study, the temperature variation inside PCS was reviewed by cooling fan on top of PCS, and the vibration characteristics of PCS were analyzed during truck transportation for reliability of the product. In most cases, a cooling fan is mounted to control the inner temperature at the upper part of the PCS and components generating the heat placed on the internal aluminum cooling plate to apply the primary cooling and the secondary cooling system with inlet fans for the external air. Results of CFD showed slightly lack of circulating capacity but simulated temperatures were durable for components. The resonance points of PCS were various due to the complexity of components. Although they were less than 40 Hz which mostly occurs breakage, it was analyzed that the vibration displacement in the resonance frequency band was very insufficient. As a result of random-vibration simulation, the lower part was analyzed as the stress-concentrated point but no breakage was shown. The steel sheet could be stable for now, but for long-term domestic transportation, structural coupling may occur due to accumulation of fatigue strength. After the test completed, output voltage of the product had lost so that extra packaging such as bubble wrap should be considered.