• 한국ITS학회 논문지
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• 제7권1호
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• pp.68-74
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• 2008

SIW (Substrate Integrated Waveguide) cavity 공진기의 구조는 유전체기판에 다수의 via-hole 을 이용함으로써 나타낼 수 있으며, rectangular waveguide 와 유사한 특성을 갖는다. 그리고 $50-{\Omega}$ 마이크로스트립라인과 SIW cavity 공진기 중앙간의 결합구조를 통하여 대역저지 특성이 나타나도록 하였다. 이러한 특성을 갖는 SIW cavity 공진기를 이용하여 X-band(9.45 GHz) 발진기를 제작하였고, 위상잡음은 100kHz offset에서 -98.1 dBc/Hz 로 측정되었다. SIW cavity 공진기는 높은 QL 값을 갖고, 2차원 구조이기 때문에 저비용에 우수한 위상잡음 특성을 갖는 발진기 설계에 응용할 수 있다.

• Journal of Power Electronics
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• 제15권1호
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• pp.31-38
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• 2015

In this paper, a buck-boost type battery charger is developed for charging battery set with a lower voltage. This battery charger is configured by a rectifier circuit, an integrated boost/buck power converter and a switched capacitors circuit. A boost power converter and a buck power converter sharing a common power electronic switch are integrated to form the integrated boost/buck power converter. By controlling the common power electronic switch, the battery charger performs a hybrid constant-current/constant-voltage charging method and gets a high input power factor. Accordingly, both the power circuit and the control circuit of the developed battery charger are simplified. The switched capacitors circuit is applied to be the output of the boost converter and the input of the buck converter. The switched capacitors circuit can change its voltage according to the utility voltage so as to reduce the step-up voltage gain of the boost converter when the utility voltage is small. Hence, the power efficiency of a buck-boost type battery charger can be improved. Moreover, the step-down voltage gain of the buck power converter is reduced to increase the controllable range of the duty ratio for the common power electronic switch. A prototype is developed and tested to verify the performance of the proposed battery charger.

• Ocean Systems Engineering
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• 제12권1호
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• pp.39-61
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• 2022

Renewable energy such as wave energy has gained popularity as a means of reducing greenhouse gases. However, the high cost and lack of available sea space in some countries have hindered the deployment of wave energy converters (WEC) as alternative means of sustainable energy production. By combining WECs with infrastructures such as floating breakwaters or piers, the idea of electricity generated from WECs will be more appealing. This paper considers the integration of vertical raft-type WEC (commonly known as the vertical flap WEC) with floating breakwater as means to generate electricity and attenuate wave force in the tropical sea. An array of 25 WECs attached to a floating breakwater is considered where their performance and effect on the wave climate are presented. The effects of varying dimensions of the WEC and mooring system of the floating breakwater have on the energy generation are investigated. The integrated WECs and floating breakwater is subjected to both the regular and irregular waves in the tropical sea to assess the performance of the system. The result shows that the integrated vertical flap-floating breakwater system can generate a substantial amount of wave energy and at the same time attenuate the wave force effectively for the tropical sea when optimal dimensions of the WECs are used.

• 한국안전학회지
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• 제27권2호
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• pp.34-41
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• 2012

In this study, it has been proposed the new type of temporary bridge which is structural performance maximization to integrated cover plate and girder as well as roll of lining board. Of all temporary bridge integrated cover plate and main girder in the form of a new type of structure is advantageous for the judge, but to the field of transport difficulties and challenges due to high altitude operations to take advantage of this challenge and deliver a structured, easy transport, and the synthesis of lining board possible was proposed. Lining board proposed in this study through experimental synthesis and analysis of the factors that influence the effectiveness of the construction and economic development in the construction method was superior, compared to the conventional lining board.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2008년도 춘계학술발표대회 논문집
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• pp.140-144
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• 2008

While we go through a rapid change in society, family types composing social relationship underwent lots of changes. Recently the range of family is included not only families on the basis of blood relationship but also single family, a one-parent family and non-blood relationship family. Now we need not unified types of housing but social integrated housing models responding to family diversity. The purpose of this study is that examine family diversity through social statistics and demography and grasp the current housing types responding to family diversity. The features of family diversity are reducing the number of family member and turning up a unformal family type. At the social statistics and demography in 2005, the number of family member is only 2.9 people per family. Due to decline of birth rate and change of marriage consciousness, various family types appear and increase such as single family, a one-parent family and non-blood relationship family. But there is lack of housing types responding to such family diversity. This study will be a basic research to develop social integrated housing models responding to family diversity. Housing must be sensitive to change of family type, so it responds our needs based on thorough understanding on various housing life.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권1호
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• pp.35-57
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• 2014

Multi-criteria decision making (MCDM) algorithms play an important role in ensuring quality of service in an integrated HetNets (Heterogeneous Networks). The primary objective of this paper is to develop a multi-criteria vertical handoff decision algorithm (VHDA) for best access network selection in an integrated Wireless Local Area Network (WLAN)/Universal Mobile Telecommunications System (UMTS)/Worldwide Interoperability for Microwave Access (WiMAX) system. The proposed design consists of two parts, the first part is the evaluation of an Analytic Hierarchy Process (AHP) to decide the relative weights of handoff decision criteria and the second part computes the final score of the weights to rank network alternatives using Simple Additive Weighting (SAW). SAW ranks the network alternatives in a faster and simpler manner than AHP. The AHP-SAW mathematical model has been designed, evaluated and simulated for streaming video type of traffic. For other traffic type, such as conversational, background and interactive, only simulation results have been discussed and presented in brief. Simulation results reveal that the hierarchical modelling and computing provides optimum solution for access network selection in an integrated environment as obtained results prove to be an acceptable solution to what could be expected in real life scenarios.

• 한국의류학회지
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• 제48권3호
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• pp.397-416
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• 2024

This study investigated gender characteristics in contemporary virtual fashion design, focusing on avatars and genderless fashion in recent collections from Auroboros, Republiqe, Placebo Digital Fashion House, RTFKT, and Tribute. Employing content analysis within a theoretical framework of gender-related research, the study coded virtual avatars in terms of biological sex, appearance, and sociological perspectives. The results showed a preference for female-type avatars, through which androgynous aesthetics were embraced and traditional gender norms were challenged. Male-type avatars reflected experimentation with blending masculine elements, emphasizing inclusivity. Human-like avatars indicated a preference for designs that promoted inclusivity and, in the process, challenged binary classifications. The examined brands strategically capitalized on compromise, sensuality, and playfulness, thereby breaking away from traditional values to opt for more diverse styles. Genderless features combined elements from traditional men's and women's clothing, espousing sensuality and playful exaggeration. These findings signify a dynamic shift away from conventional gender standards to foster inclusivity and experimentation. They can serve as a reference for promoting creative strategies and design innovation, challenging the traditional gender perspective in the fashion industry. Implementing these strategies can lead to a more inclusive representation of fashion styles, encouraging critical thinking about gender norms.

• 한국과학교육학회지
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• 제32권2호
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• pp.265-278
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• 2012

본 연구는 2000년부터 연구 시점인 2011년 6월까지 한국과학교육학회와 한국초등과학교육학회에 실린 관련 연구 논문들을 연도별 관련 논문 편수, 연계주제, 연구내용, 연구설계, 교육대상의 준거를 통해 분석함으로써 현재까지 융합 및 통합 과학교육과 관련된 학계의 연구 동향을 살펴보기 위한 연구이다. 해당 기간 동안의 분석 대상 논문은 총 110편(한국과학교육학회지 게재 논문 894편 중 69편, 한국초등과학교육학회지 게재 논문 446편 중 41편)이 해당되었다. 연도별 융합 및 통합 과학교육과 관련된 연구 논문의 게재 편수 분석 결과 2000년대 중반까지는 게재 논문 수의 꾸준한 증가를 보이다가 이후 관련 논문수가 줄어드는 경향이 있었다. 연계주제별 분석 결과 STS 및 통합 분야 연계가 가장 많았으며 그 다음으로는 과학분야 내 연계, 타 교과 연계 순으로 나타났다. 연구내용별 분석 결과 효과분석에 대한 연구가 가장 많았으며 다음으로 실태/인식, 이론/내용분석, 개발/적용의 순으로 분석되었다. 교육대상별 분석 결과 초등학생을 대상으로 한 연구가 가장 많았으며 다음으로 중학생, 고등학생, 문헌, 교사, 예비교사 등의 순으로 나타났다. 이러한 융합 및 통합 과학교육에 대한 연구 분석은 지금까지의 연구 동향 뿐 아니라 앞으로의 관련 연구 방향에 대한 시사점도 함께 제공해 줄 수 있는 바, 다양한 관련 연구 자료들의 종합적인 데이터베이스화 및 분석 노력, 현장감 있는 융합 콘텐츠의 개발, 교사 인식 변화 연수 지원, STS 교육에 대한 반성적 평가 등의 필요성을 제시하였다는 점에서 본 연구의 의의를 찾을 수 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.503-506
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• 1996

An integrated Robot control system for SCARA robot is developed. The system consists of an off-line programming(OLP), software and a robot controller using four digital signal processor(TMS32OC50). The OLP has functions of teaching task, dynamic simulator, three dimensional animation, and trajectory planning. To develop robust dynamic control algorithm, a new sliding mode control algorithm for the robot is proposed. The trajectory tracking performance of these algorithm is evaluated by implementing to SCARA robot(SM5 type) using DSP controller which has conventional PI-FF control algorithm. To make SCARA robot operate according to off-line teaching, an interface between OLP and robot controller in the integrated system is designed. To demonstrate performance of the integrated system, the proposed control algorithm is applied to the system.

• Asia pacific journal of information systems
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• 제9권3호
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• pp.127-142
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• 1999

There have been strong arguments that the best organizational type for the information society is a network organization which is intelligent and learning-oriented as well as has problem solving capacities rather than a traditional passive organization which strictly follows standard operating procedures. In this perspective, integrated information work environment emerges as attractive work environment for the 21st century. Integrated information work environment is defined as an integrated electronic environment that is available to and readily accessible be each employee and is structured to provide immediate, individualized on-line access to the full range of information, software, guidance, advice and assistance, data, images, tools, and assessment and monitoring systems to permit job performance with minimal support and intervention by others. Case study was performed to measure the productivity improvement by implementing integrated information work environment in life insurance company. The results show that there is a number of indications of strong work productivity improvements.