• 식품과학과 산업
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• 제52권1호
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• pp.20-31
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• 2019

Sensory perception of food/beverage products is one of the most important quality factors to determine consumer acceptability and thus sensory discrimination methodology has been a vital tool for quality management. Signal detection theory(SDT) and Thurstonian modeling provide the most advanced psychometric approach to modeling various discrimination methods. In these theories, perceptual and cognitive decisional factors are considered so that, a fundamental measure of sensory difference (d') can be computed, independent of test methods used. In this paper, sensory discrimination analysis based on SDT and Thurstonian modeling is introduced for more accurate and systematic applications of sensory and hedonic quality management in industry. Ways to realize the statistical power and relative sensitivity of sensory discrimination methods theorized in SDT and Thurstonian modeling in practice, are also discussed by using a case study of the Nongshim quality management program for drinking water in which SDT A-Not A test methodology was further optimized.

• 한국지능시스템학회논문지
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• 제22권5호
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• pp.533-539
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• 2012

본 연구는 사람 팔의 움직임에 따른 신체 발생 신호인 근육의 근전도 데이터를 실시간으로 추출하여 신호 발생에 따른 외골격 로봇 팔의 동작을 통해 제어신호의 유효성을 평가하는데 그 목적이 있다. 지능형 알고리즘에 의해 인간의 인지와 판단의 결과가 팔의 근육을 통해서 제어 가능한 지를 실제 시스템을 구성하여 확인해 보는 것이다. 근육의 수축과 이완에 따른 근전도 센서 데이터는 외골격 로봇 팔을 구동하는 원신호로 사용되며 로봇 구동을 위한 힘을 전달하는 엑츄에이터가 인간의 팔의 동작을 모사한다. 이를 위해 아날로그 필터회로와 관련 회로를 설계하여 신호를 추출하였고 시스템의 동작을 위해 DSP컨트롤러를 통한 신호처리과정을 거친 후 지능 알고리즘을 통한 부하의 정확한 예측을 위한 퍼지 논리 알고리즘의 동작을 표현할 수 있는 외골격 로봇 팔을 제작하였다.

• 한국철도학회논문집
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• 제10권6호
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• pp.730-734
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• 2007

본 논문은 철도신호 내장형제어기의 정지결함검출을 위해 적용되는 워치독타이머 설계와 관련하여 FMEA와 FTA를 통해 타이머 결함발생을 시스템이 인식하지 못하는 은폐고장(Hidden Failure)의 심각성을 제시한다. 은폐고장은 결함허용을 목적으로 추가된 소자의 결함발생으로 인한 시스템의 신뢰성 및 안전성의 저하이다. 이러한 은폐고장으로 인해 안전무결성레벨이 저하된 상태로 시스템이 운용되는 젓을 방지하기 위해 본 논문에서는 바이탈워치독타이머를 설계하고, 결함발생에 대한 회로의 안전성을 평가하여 기존 설계로 인한 안전성저하 문제가 보완되었음을 입증한다.

• 디지털산업정보학회논문지
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• 제7권1호
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• pp.19-29
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• 2011

The u-Healthcare system, a new paradigm, provides healthcare and medical service anytime, anywhere in daily life using wired and wireless networks. It only doesn't reach u-Hospital at home, to manage efficient personal health in fitness space, it is essential to feedback process through measuring and analyzing a personal vital signs. MBAN(Medical Body Area Network) is a core of this technology. MBAN, a new paradigm of the u-Healthcare system, can provide healthcare and medical service anytime, anywhere on real time in daily life using u-sensor networks. In this paper, an ontology-based context-awareness in MBAN proposed system development methodology. Accordingly, ontology-based context awareness system on MBAN to Elderly/severe patients/aged/, with measured respiratory rate/temperature/pulse and vital signs having small variables through u-sensor network in real-time, discovered abnormal signs and emergency situations which may happen to people at sleep or activity, alarmed and connected with members of a family or medical emergency alarm(Emergency Call) and 119 system to avoid sudden accidents for early detection. Therefore, We have proposed that accuracy of biological signal sensing and the confidence of ontology should be inspected.

• 디지털산업정보학회논문지
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• 제6권4호
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• pp.57-65
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• 2010

Application of WBAN technology in medical field facilitates the prevention of diseases by collecting the vital signs remotely. It also enables to prevent the accidental emergency situation in advance plus long-tem monitoring of patients with chronic diseases such as heart diseases, hypertension, or the elderly and infirm. For emergency patients, major vital signal information collected by the 'Sensing' should have the top priority and such information should be transferred as promptly as possible without competition. In addition, when an emergency occurs to a patient, a priority mechanism is necessitated for a urgent message to get through to the final destination. However, LR-WPAN IEEE 802.15.4 technology does not consider such emergency message handling features. To deal with aforementioned issues, the IEEE 802.15.4 super frame protocol structure has been designed for stable transfer of emergency information in WBAN environment in this study, and alternation to super frame structures have been made, allowing GTS(Guaranteed Time Slot) can be used first at CFP (Contention Free Period) by reserving the resources in advance and prioritize the emergency signals. NS-2 has been utilized for the performance test and analysis.

• Journal of Electrical Engineering and Technology
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• 제10권1호
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• pp.364-371
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• 2015

In this study, we developed a feasible structure of a textile-based inductive sensor using a machine embroidery method, and applied it to a non-contact type vital sign sensing device based on the principle of magnetic-induced conductivity. The mechanical heart activity signals acquired through the inductive sensor embroidered with conductive textile on fabric were compared with the Lead II ECG signals and with respiration signals, which were simultaneously measured in every case with five subjects. The analysis result showed that the locations of the R-peak in the ECG signal were highly associated with sharp peaks in the signals obtained through the textile-based inductive sensor (r=0.9681). Based on the results, we determined the feasibility of the developed textile-based inductive sensor as a measurement device for the heart rate and respiration characteristics.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권8호
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• pp.3529-3550
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• 2016

In heterogeneous networks (HetNets), energy saving is vital for a sustainable network development. Many techniques, such as spectrum allocation, network planning, etc., are used to improve the network energy efficiency (EE). In this paper, micro BSs utilizing cell range expansion (CRE) and spectrum allocation are considered in multi-channel heterogeneous networks to improve EE. Hotspot region is assumed to be covered by micro BSs which can ensure that the hotspot capacity is greater than the average demand of hotspot users. The expressions of network energy efficiency are derived under shared, orthogonal and hybrid subchannel allocation schemes, respectively. Particle swarm optimization (PSO) algorithm is used to solve the optimal ratio of subchannel allocation in orthogonal and hybrid schemes. Based on the results of the optimal analysis, we propose three service control strategies on the basis of large-scale user behaviors, i.e., adjust micro cell rang expansion (AmCRE), adjust micro BSs density (AmBD) and adjust micro BSs transmit power (AmBTP). Both theoretical and simulation results show that using shared subchannel allocation scheme in AmBD strategies can obtain maximal EE with a very small area ratio. Using orthogonal subchannel allocation scheme in AmCRE strategies can obtain maximal EE when area ratio is larger. Using hybrid subchannel allocation scheme in AmCRE strategies can obtain maximal EE when area ratio is large enough. No matter which service control strategy is used, orthogonal spectrum scheme can obtain the maximal hotspot user rates.

• Journal of Ginseng Research
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• 제42권3호
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• pp.389-399
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• 2018

Background: The antioxidant effects of Panax ginseng have been reported in several articles; however, little is known about the antimelanogenesis effect, skin-protective effect, and cellular mechanism of Panax ginseng, especially of P. ginseng calyx. To understand how an ethanol extract of P. ginseng berry calyx (Pg-C-EE) exerts skin-protective effects, we studied its activities in activated melanocytes and reactive oxygen species (ROS)-induced keratinocytes. Methods: To confirm the antimelanogenesis effect of Pg-C-EE, we analyzed melanin synthesis and secretion and messenger RNA and protein expression levels of related genes. Ultraviolet B (UVB) and hydrogen peroxide ($H_2O_2$) were used to induce cell damage by ROS generation. To examine whether this damage is inhibited by Pg-C-EE, we performed cell viability assays and gene expression and transcriptional activation analyses. Results: Pg-C-EE inhibited melanin synthesis and secretion by blocking activator protein 1 regulatory enzymes such as p38, extracellular signal-regulated kinases (ERKs), and cyclic adenosine mono-phosphate response element-binding protein. Pg-C-EE also suppressed ROS generation induced by $H_2O_2$ and UVB. Treatment with Pg-C-EE decreased the expression of matrix metalloproteinases, mitogen-activated protein kinases, and hyaluronidases and increased the cell survival rate. Conclusion: These results suggest that Pg-C-EE may have antimelanogenesis properties and skin-protective properties through regulation of activator protein 1 and cyclic adenosine monophosphate response element-binding protein signaling. Pg-C-EE may be used as a skin-improving agent, with moisture retention and whitening effects.

• 한국전자통신학회논문지
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• 제11권9호
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• pp.923-928
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• 2016

오늘날 사람들의 건강을 실시간으로 점검하고 응급상황에 대처하기 위해 다양한 기술들이 개발되어지고 있다. 지금까지는 대부분 맥박과 같은 생체신호를 측정하여 활용하고 있지만 최근에는 뇌파(EEG)를 활용하는 연구가 늘어나고 있다. 그러나 길에서 걸어 다니는 모든 사람들의 EEG 신호를 실시간으로 검출하여 해당 서버에 전송하는 것은 여러 가지 문제점을 야기시킨다. 특히, 2차원 공간에서 실시간으로 EEG 신호를 수집 및 전송하는 제약이 존재하기 때문에 본 논문에서는 이러한 제약을 피할 수 있는 3차원 공간의 드론을 활용하는 효율적인 네트워크 모델을 제안하고자 한다. 이러한 모델을 Opnet 시뮬레이터를 활용하여 네트워크 구조를 설계하고 시뮬레이션하고 평가하였다.

• 한국정보전자통신기술학회논문지
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• 제6권2호
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• pp.88-94
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• 2013

본 논문은 LMS 알고리즘의 수렴 속도를 향상시키기 위한 효율적인 신호간섭 제어기법을 제안한다. 수신 데이터를 재활용하여 심볼 시간 주기에 계수들을 곱함으로써 적응되는 제안된 알고리즘의 수렴특성이 수렴 속도의 향상을 이론적으로 증명하기 위해 분석한다. 스텝-크기 매개변수 ${\mu}$가 증가 됨에 따라 알고리즘의 수렴 속도가 제어된다. 고유치 확산을 증가시킴에 따라 적응 등화기의 수렴속 도를 천천히 제어하고 평균 자승 에러의 안정-상태 값을 증가시키는 효과를 나타내며 데이터-재사 용 LMS 기술이 수렴속도를 (B+1)배만큼 증가시켜 적응 등화기에서 신호간섭제어의 우수성을 입증 한다.