• Journal of information and communication convergence engineering
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• 제16권1호
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• pp.23-30
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• 2018

In cognitive radio (CR), spectrum sensing is an essential function since secondary users (SUs) must determine whether the primary user (PU) is utilizing the channel or not, and furthermore, SUs opportunistically access the licensed channel when the PU is absent. In this paper, spectrum sensing is implemented by energy detection, and a software-defined radio testbed is built to evaluate sensing performance by energy detection in a real environment. In particular, the testbed was built based on the GNU's Not Unix (GNU) Radio software platform and Universal Software Radio Peripheral National Instruments 2900 devices. More specifically, a new block of energy detection is developed by using an out-of-tree module from GNU Radio. To successfully integrate CR into the cloud computing paradigm, we also implement cloud computing-based spectrum sensing by utilizing a cloud server with ThingSpeak, such that we can store, process, and share the sensing information more efficiently in a centralized way in the cloud server.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.469-472
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• 2006

Amount used of admixture fare is increasing for concrete economic efficiency and ability security. Security of economic efficiency and ability can expect by use of this admixture fare but is displaying a lot of problems on early age strength hold by hydrate delay relatively. Specially, in the case of construction site, concrete strength can speak that interrelation is high with mold removal of forms time. Therefore, is economical and need examination of plan that can secure robber within 3 days using admixture fare such as fly ash and blast furnace slage differential speech to secure function. In this study, adding liquid admixture within 1% of a binding agent quantity to examine these problem with physical characteristic after hardening ago specially, strength change at standard and air dry curing of observed change in priority. Air dried and water curing total strength enhancement effects appeared by thing which is in case of add test result liquid admixture by below 1% and strength deputy by passage of age could know is not big.

• 정보학연구
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• 제9권3호
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• pp.33-47
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• 2006

We will can do quality of measurement of service that thing is quite abstract concept. Generally, we speak Service of quality that property of a product, usability of use, social quality requirement to a quality of service by wide meaning. A purpose of this study was comparison regarding a way to measure of service quality, and in the insufficient section there was anything, and progress of model study of service left no matter how much focus to it. There is comparative study a few progress of literature of a PZB, SERVQUAL, SERVPERF, model. Desarbo, Huff, Rolandelli, & Choi, (1994: 125-131) proposed that to solve the above model contradiction point, and Presentation called a plan based on to Conjoint analysis. There is Critical point to decide on priority order of proposed model of service measurement. This study has a lot of the pieces which are short by absence of empirical study, but will make a supplementation in next term study.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(5)
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• pp.125-128
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• 2002

One of ultimate purpose that performance to information society been going recently festinately intends is in human's welfare improvement. Also, research about assist for disabled person that belong on category that is disabled persons' cloth elevation estranged in the past according to disabled person population's increase and change of advanced human rights consciousness to ruins of industrial society and traffic civilization is afoot abuzz. Guidance robot of sight obstacle can speak as its part. This research is thing about voice system about location set and search in guidance robot that is embodying to make sight disabled person can visit schedule place smoothly.

• Current Optics and Photonics
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• 제8권5호
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• pp.508-514
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• 2024

This paper presents a deep learning-based weight sensor, using optical speckle patterns of multimode fiber, designed for real-time intrusion detection. The weight sensor has been trained to identify 11 distinct speckle patterns, ranging in weight from 0.0 kg to 2.0 kg, with an interval of 200 g between each pattern. The estimation for untrained weights is based on the generalization capability of deep learning. This results in an average weight error of 243.8 g. Although this margin of error precludes accurate weight measurement, the system's ability to detect abrupt weight changes makes it a suitable choice for intrusion detection applications. The weight sensor is integrated with the Google Teachable Machine, and real-time intrusion notifications are facilitated by the ThingSpeak^TM cloud platform, an open-source Internet of Things (IoT) application developed by MathWorks.

• 한국아동복지학
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• 제32호
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• pp.33-68
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• 2010

본 연구의 목적은 아동 청소년기에 성폭력으로 인한 피해를 경험한 사람들을 이해하고자 하는 것이다. 이러한 목적을 달성하기 위하여, 연구자는 아동 청소년기에 성폭력을 경험한 사람들을 직접 만나서 그들의 목소리에 귀를 기울이는 전략을 선택하였다. 즉, 현상을 경험한 사람들의 주관적인 의미 구조를 탐구하였으며, 이를 위해 질적연구 접근을 시도하였다. 구체적으로 아동 청소년기에 성폭력 경험이 있는 6명의 여성과 심층면접을 하여 자료를 수집하고, 수집된 자료를 가지고 범주화분석과 재분석을 실시하였다. 최종적으로 발견된 주제들은 '일상에서 벗어난 그날, 말할 수 없는 공포감: 어느 날 갑자기 왜 하필 이런 일이', '의식하지 않으려고 발버둥침: 말 못할 고통, 말할수 없어서, 나는 왜 이럴까? 난 내가 싫어', '잊었다고 끝이 아니었어: 말하면 괜찮을까?, 의식하게 됨, 더 심해진 혼란들', '내 잘못이 아니라는 것은 알지만: 내면화된 사회통념들, 여성성에 대한 부정, 혼란과 회복' 등이 있었다. 연구결과에 근거하여 아동 청소년기에 성폭력을 경험한 여성들을 돕기 위한 실천지침을 제시하였으며, 후속연구에 대해서도 제언하였다.

• ETRI Journal
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• 제45권4호
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• pp.570-580
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• 2023

Sensor nodes are the most significant part of a wireless sensor network that offers a powerful combination of sensing, processing, and communication. One major challenge while designing a sensor node is power consumption, as sensor nodes are generally battery-operated. In this study, we proposed the design of a low-power, long range-based wireless sensor node with flexibility, a compact size, and energy efficiency. Furthermore, we improved power performance by adopting an efficient hardware design and proper component selection. The Nano Power Timer Integrated Circuit is used for power management, as it consumes nanoamps of current, resulting in improved battery life. The proposed design achieves an off-time current of 38.17309 nA, which is tiny compared with the design discussed in the existing literature. Battery life is estimated for spreading factors (SFs), ranging from SF7 to SF12. The achieved battery life is 2.54 years for SF12 and 3.94 years for SF7. We present the analysis of current consumption and battery life. Sensor data, received signal strength indicator, and signal-to-noise ratio are visualized using the ThingSpeak network.

• 한국실내디자인학회논문집
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• 제15권6호
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• pp.43-51
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• 2006

The purpose of this study is to present possibility about applying space design of urban theory focused on collective memory. Urban which is the final data of human's collective life has been recognized creative circumstances human collective is living. It can not think without collective from its motivation to problem of form as well as building as element which compose these cities. It is to recognize essential attribute of construction in the collective that think architecture with urban, and It means that recognize actuality of architecture that can talk as the most collective product that represent human. There was discussion for collective and urban. But, this problem was proceeded to clear human knowledge of architecture mainly in other discipline, and even if speak as field of architecture, it could just pass confined meaning by refering at process that clear several main aspects of architecture as doing not pass over more than it. Problem of form that is ultimate aspect of architecture remained by different thing still doing not combine with collective architecture, and occasionally happened the case that make collective of architecture and relation of form overly incommodiously reducing form by a tool for diagram, shape, figuration in the aspect of collective. This research study concept for memory collective in the urban and collective of architecture, and choose urban planning methodology and their work by specific example between Aldo Rosi and Rem Koolhaas dealing with architecture and urban, and present possibility about space design of urban.

• 한국실내디자인학회논문집
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• 제15권3호
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• pp.155-162
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• 2006

Space is integrated or segment with organic formation by circulation path. It estimates important problem to grasp as factor that promote movement of visitor and space organization without grasping circulation as connection relation about simple space function from these viewpoint, is a thing which this study does not cause confusion to visitor's circulation path through data that analyze form of space connection and visitor's circulation path as quantitative in museum space and layout form that access by easy each unit exhibition grasps what it is. This study does factor grasping for guideline and inspection circulation path of layout by purpose in exhibition space on the basis of analytical result that grasps connection form between exhibition area that grasp laying stress on visitor's movement and appears in space through follow-up survey for circulation path of museum exhibition area. Space connection form that is expose by sequence of investigation and analysis(II) estimates on constituent affecting to visitor's circulation, and these do not speak for all space connection forms at the museum, but may systematize typology about connection form of unit spaces to utilize by indicator pointer of space planning if continue study to various spatial sphere more than hereafter. Unit exhibition area, divide connection form of space by grid and tree and laying stress on this quantitative data by spectator follow-up survey comparison and Estimate that space connection form provides partial basis of judgement for supposition that can promote direction and circulation path about visitor's movement if summarize result of investigation and analysis (III).

• 디자인학연구
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• 제18권1호
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• pp.223-232
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• 2005

컴퓨터의 보급으로 모든 산업이 자동화 및 간편화 되어가고 있는 개발 및 생산체계 환경과 경쟁적인 산업디자인 제품개발 과정에서 가장 우선하는 것은 신속성과 다양성의 추구라고 할 수 있다. 디자인을 연구하는 학생들에게 사회 환경 적응을 위해 다양한 아이디어를 단시간에 전개해야만 한다. 그러므로 학교나 기업에서 새로운 조형의 전개와 신속한 디자인 설계검토 및 생산을 위해서는 신속한 조형능력에 대한 결과를 보여줄 수 있는 새로운 도구를 찾게 되었다. 이와 같은 환경변화에 따라 기업은 경쟁이 치열해짐에 따른 제품설계에서부터 생산에 이르기까지의 소요되는 시간과 비용 절감에 따른 요구와 학교는 다양한 디자인전개에 따른 3차원 모형에 대한 결과물 제시 등으로 RP도입을 생각하기에 이르렀다. 본 연구는 앞으로 도입해서 사용하고 있거나 예정하고 있는 대학에 하나의 새로운 사례로서 도움이 될 수 있다고 생각한다. 본 연구목적은 이러한 시점에서 연구자가 재직하고 있는 대학에서 사용하고 있는 RP기기를 중심으로 학생들의 디자인결과물을 어떻게 제작했으며, 수작업이나 CNC기기를 사용한 모형제작 방식과 의 차이점을 비교하려고 한다. 그 결론으로는 수동형 도구로는 곡선적인 모형으로 형태가 큰 것이, CNC기기로는 복잡하지 않으면서 정교하게 제작하려는 모형, RP는 복잡하면서 제품의 크기가 작은 것이 경제적이 측면에서 유리함을 알 수 있었다.