• 신재생에너지
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• 제9권2호
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• pp.51-57
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• 2013

The Grid code is being strengthen as increase of renewable energy ratio. Especially, the grid connection regulations are continuously being updated for stable operation of power grids. Static grid support and Dynamic grid support must make an accurate measure at Grid connected point because they needs control algorithm individually. It has to exactly measure voltage including switching ripple at the output of the inverter generating system. In addition, it is necessary to have an accurate voltage measurement when the situation rapidly changing the grid impedance is caused by the input of serial impedance of transformer and line impedance as well as Grid Fault Device. In this paper, We propose a new detection method of grid voltage to calculate accurately the r.m.s voltage of the grid connection point along the standard required by the low voltage regulation. We verified performance through simulation grid fault device.

• 한국융합학회논문지
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• 제10권9호
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• pp.47-53
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• 2019

본 논문은 소프트웨어 및 제품의 개발운영 및 개발보안운영에 대한 특성을 검토하고 소프트웨어 코드 관점에서 사용 분석도구를 고찰하였다. 또한 보안 설계규칙을 고려할 때 인적인 요소의 중요성과 이를 강화해야 할 필요성이 강조되었다. 본 논문에서는 개발보안운영을 고려할 때 절차적인 요소의 관점에서 신속하고 정확한 의사결정에 중점을 두고 변화를 관리하는 안전한 프로세스에 대해 분석하였다. 또한 본 논문에서는 개발보안운영 특성과 관련하여 성숙도 모델 분석의 필요성을 논의하였고, 이에 따른 동적인 요소와 정적인 요소의 강도 및 통합 요소에 대한 세부 절차를 통해 분석요소의 의미를 분석하였다. 본 논문에서는 위협모델링 및 컴플라이언스 그리고 통제를 위한 스캔 활동이나 코드 분석과 같은 요소에 대해서도 분석하였다.

• Computers and Concrete
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• 제19권6호
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• pp.631-639
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• 2017

This study experimentally investigated the flexural capacity of a concrete beam reinforced with a newly developed GFRP bar that overcomes the lower modulus of elasticity and bond strength compared to a steel bar. The GFRP bar was fabricated by thermosetting a braided pultrusion process to form the outer fiber ribs. The mechanical properties of the modulus of elasticity and bond strength were enhanced compared with those of commercial GFRP bars. In the four-point bending test results, all specimens failed according to the intended failure mode due to flexural design in compliance with ACI 440.1R-15. The effects of the reinforcement ratio and concrete compressive strength were investigated. Equations from the code were used to predict the deflection, and they overestimated the deflection compared with the experimental results. A modified model using two coefficients was developed to provide much better predictive ability, even when the effective moment of inertia was less than the theoretical $I_{cr}$. The deformability of the test beams satisfied the specified value of 4.0 in compliance with CSA S6-10. A modified effective moment of inertia with two correction factors was proposed and it could provide much better predictability in prediction even at the effective moment of inertia less than that of theoretical cracked moment of inertia.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2015년도 추계학술대회
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• pp.208-210
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• 2015

최근 중국 천진항에서 발생한 폭발사고로 인하여 위험물에 대해 규제가 강화되고 있다. 이는 국내에서 수출되는 화학제품에도 영향을 주어 국제기준과 상이한 부분까지도 충족해야만 수입통관이 가능한 규제가 되었다. 2004년부터 국제적으로 강제화 된 위험물 운송규정(IMDG Code)을 준수하여 위험물을 수출하고 있는 국내 산업계에도 상당한 피해가 되고 있으나 중국정부의 요구에 따라야만 통관이 가능하기 때문에 물류의 효율성 측면에서 많은 어려움이 가중 되었다. 국내에서도 안전한 위험물 관리 필요성이 대두되고 있지만 단편적인 임시방편의 정책은 오히려 경제적 비용 손실과 불필요한 규제 가중으로 연결되기 되기 때문에 장기적으로 안전한 동시에 효율적인 위험물 관리방안을 찾아야만 국내 화학산업의 지속적인 성장이 가능하다.

• Computers and Concrete
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• 제17권3호
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• pp.305-322
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• 2016

The work is intended to demonstrate that the loss of bond between concrete and flexural steel which led in recent years a number of flat-slab structures to punching collapse under service loading conditions is also relevant to ultimate limit-state design. It is based on a comparative study of the results obtained from numerical experiments on flat slab-column sub-assemblages. The slabs were designed for punching either in compliance with the EC2 code requirements, which do not allow for such loss of bond, or in accordance with the compressive force-path method which considers the loss of bond between concrete and the flexural reinforcement in tension as the primary cause of punching. The numerical experiments are carried out through the use of a nonlinear finite element analysis package for which, although ample published evidence of its validity exists, additional proof of its suitability for the purposes of the present work is presented.

• 국제초고층학회논문집
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• 제4권4호
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• pp.311-318
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• 2015

The ASHRAE Design Guide for Tall, Supertall and Megatall Building Systems was produced in collaboration with the CTBUH. The design guide outlines various tall building mechanical systems that are presently being designed or are planned for the future. Tall commercial buildings in particular present a series of design problems that set them apart from other functions. The Design Guide will be of interest to owners, architects, structural engineers, mechanical engineers, electrical engineers and other specialized engineers and consultants. This design guide addresses design issues for tall commercial buildings, which are very often mixed-use, and commonly consist of low level retail, office floors, residential units, and hotel uses.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.730-733
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• 2004

Three Hollow RC piers were tested under a constant axial load and a cyclically reversed horizontal loadto investigate the structural behavior of hollow RC piers using the high strength concrete and the high strength rebars. The test variables include concrete compressive strength, steel strength, and steel ratio. The test results indicate that RC piers using the high strength concrete and high strength rebars exhibit ductile behavior and appropriate seismic performance, in compliance with the design code. The present study allows more realistic application of high strength rebars and concrete to RC piers, which will provide enhanced durability as well as more economy.

• 한국공간구조학회논문집
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• 제10권1호
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• pp.111-117
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• 2010

본 논문은 건축구조 관련규제를 검토하여 분석함으로서 건축구조 안전에 대한 제도적 문제를 도출하고자 하였다. 분석대상 법령으로는 건축법과 동시행령, 동시행규칙, 건축물의 구조기준 등에 관한 규칙 건축구조기준을 대상으로 하였다. 분석결과로는 구조안전의 확인 절차상의 적용에 미비점이 있는 것으로 분석되어 개선방안을 제시하였다. 보완사항으로는 용어사용의 적합성과 구조안전확인서 적용의 적합성, 특수구조의 건축구조기준 제정이다.

• 웰빙융합연구
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• 제2권1호
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• pp.35-39
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• 2019

This paper presents two social and academic studies on the boundary between cultural production and consumption. The first line of the study on cultural omnivore analyzes the choice of heterogeneous audiences in the face of various cultural offerings. The second line is a study of market categories, which analyzes the responses of peer audiences to objects with different levels of category code compliance. As such, this paper developed a heterogeneous audience model to evaluate objects of different types. This allows us to consider two dimensions of cultural preference: diversity and orientation of selection. To this end, this paper proposes a new analytical frame work to map consumption behavior on these two dimensions. The results suggest that one type of target that values diversity and transformation is particularly resistant to those that span boundaries. We test this argument in the analysis of two large data sets on film and restaurant reviews. Overall, our findings can extend beyond cultural consumption. Outline variability of contextual individuals or individuals in the same situation can cross cultural boundaries even if they are not intentionally pursuing such hybridism.

• Journal of Information Processing Systems
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• 제13권1호
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• pp.26-39
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• 2017

The need for embedded devices to be able to exchange information with each other and with data centers is essential for the advent of the Internet of Things (IoT). Several existing communication protocols are designed for small devices including the message-queue telemetry transport (MQTT) protocol or the constrained application protocol (CoAP). However, most of the existing implementations are convenient for computers or smart phones but do not consider the strict constraints and limitations with regard resource usage, portability and configuration. In this paper, we report on an industrial research and development project which focuses on the design, implementation, testing and deployment of a MQTT module. The goal of this project is to develop this module for platforms having minimal RAM, flash code memory and processing power. This software module should be fully compliant with the MQTT protocol specification, portable, and inter-operable with other software stacks. In this paper, we present our approach based on abstraction layers to the design of the MQTT module and we discuss the compliance of the implementation with the requirements set including the MISRA static analysis requirements.