• ETRI Journal
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• 제35권5호
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• pp.869-879
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• 2013

This study is related to the acquisition of physiological signals of human emotions and the recognition of human emotions using such physiological signals. To acquire physiological signals, seven emotions are evoked through stimuli. Regarding the induced emotions, the results of skin temperature, photoplethysmography, electrodermal activity, and an electrocardiogram are recorded and analyzed as physiological signals. The suitability and effectiveness of the stimuli are evaluated by the subjects themselves. To address the problem of the emotions not being recognized, we introduce a methodology for a recognizer using prototype-based learning and particle swarm optimization (PSO). The design involves two main phases: i) PSO selects the P% of the patterns to be treated as prototypes of the seven emotions; ii) PSO is instrumental in the formation of the core set of features. The experiments show that a suitable selection of prototypes and a substantial reduction of the feature space can be accomplished, and the recognizer formed in this manner is characterized by high recognition accuracy for the seven emotions using physiological signals.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.349-352
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• 2003

A personal low-frequency stimulator is a portable device to relax muscle pains of a person. The stimulator generates combined low-frequency pulses to be applied to pads attached to painful muscles. This paper reports a development of such device with its characteristic analyses. The major components of our stimulator are MCU, high-voltage generating circuit part, high-voltage switching circuit part, input switch part and display unit. High-voltage generating circuit is designed by using a boost converter circuit and allows user control of the output voltage. High-voltage switching circuit, controlled by MCU, generates output voltage to be applied to pads. Input switch part is composed of power supply, intensity selection, mode selection and memory. Display unit adopts a text LCD module to display modes, Intensity, output frequency and user set-up time. Our designed safety circuit, to protect human body from possible electric shock, slowly increases the output voltage to the selected output intensity. It continuously checks the output pulse shape and disable the output when dangerous pulses are detected. This paper also shows some experimental results.

• 전자공학회논문지CI
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• 제49권2호
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• pp.53-60
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• 2012

최근접 이웃 분류에서 입력 데이터의 클래스는 선택된 근접 학습 데이터들 중에서 가장 빈번한 클래스로 예측된다. 최근접분류 학습은 학습 단계가 없으나, 준비된 데이터가 모두 예측 분류에 참여하여 일반화 성능이 학습 데이터의 질에 의존된다. 그러므로 학습 데이터가 많아지면 높은 기억 장치 용량과 예측 분류 시 높은 계산 시간이 요구된다. 본 논문에서는 분리 경계면에 위치한 학습 데이터들로 구성된 새로운 학습 데이터를 생성시켜 분류 예측을 수행하는 프로토타입 선택 알고리즘을 제안한다. 제안하는 알고리즘에서는 분리 경계 영역에 위치한 데이터를 Tomek links와 거리를 이용하여 선별하며, 이미 선택된 데이터와 클래스와 거리 관계 분석을 이용하여 프로토타입 집합에 추가 여부를 결정한다. 실험에서 선택된 프로토타입의 수는 원래 학습 데이터에 비해 적은 수의 데이터 집합이 되어 최근접 분류의 적용 시 기억장소의 축소와 빠른 예측 시간을 제공할수 있다.

• 한국정밀공학회지
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• 제18권3호
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• pp.75-83
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• 2001

RIM(Reaction Injection Molding) is a widely used method to manufacture middle-large size outfit-part for a prototype car. The main advantage of RIM is the capability of manufacturing a small number of prototype parts with less cost and lead time than injection molding which is the most popular method to manufacture plastic parts. Generally, epoxy resin and RTV(Room Temperature Vulcanization) silicon are used as mold materials for RIM, and the selection of mold materials is usually depended upon the industrial environment of manufactures and it decides overall mold making process and part quality. This paper suggests a new mold making process by consolidating the advantages of epoxy resin and RTV silicon based RIM mold to enhance the parts quality while reducing the manufacturing cost and time and shows the competitiveness of the suggested process compared with conventional methods.

• 한국결정성장학회지
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• 제30권6호
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• pp.264-270
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• 2020

사용자 중심의 서비스디자인 방법론을 통한 디자인개발을 진행하고 시제품 제작 시 소재 선정 기준에 대해 조사분석하여 선정된 소재인 CFRP(Carbon Fiber Reinforced Plastics) CNT(Carbon Nano Tube)를 동물용 X-ray 디텍터 패널부분에 적용하여 제품디자인 및 시제품 개발을 진행하고 CFRP CNT 패널을 적용하여 완성된 시제품을 Drop 테스트, 전면 외압 강도 시험, 방진/방수 성능 시험을 진행하여 야외환경에서 사용하는 휴대가능한 동물용 X-ray 디텍터로 활용이 가능한 제품임을 확인하였다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.1277-1282
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• 2009

The main objective of this prototype is to control resonance frequency of DTL system through the temperature control of cooling water. It is to resonant frequency of the drift tube cavities to 350 MHz. This paper describes the design of a prototype cooling water skid required for the temperature control of the DTL cavities, focusing in the modeling and simulation of the cooling system, the sizing of water pumping skid component.

• 한국해양공학회지
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• 제14권2호
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• pp.84-88
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• 2000

The main objectives of this study are to compare the obtained mechanical characteristics of reduced-scale model materials with those of the prototype and to provide the information on the best selection of materials. Manufacturing techniques on the micro-concrete and reduced reinforcement are introduced. The test results of these materials are shown to be satisfactory with regard to the similitude requirement. The simple beam tests were performed to verify similitude in the bond behavior between micro-concrete and reduced reinforcement. Those results also prove that these manufacturing and experimental techniques are useful and reliable for reduced-scale model tests.

• 센서학회지
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• 제30권4호
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• pp.223-228
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• 2021

This work presents a low-power CMOS image sensor (CIS) with a multi-column-parallel (MCP) readout structure while focusing on improving its performance compared to previous works. A delta readout scheme that utilizes the image characteristics is optimized for the MCP readout structure. By simply alternating the MCP readout direction for each row selection, additional memory for the row-to-row delta readout is not required, resulting in a reduced area of occupation compared to the previous work. In addition, the bias current of a pre-amplifier in a successive approximate register (SAR) analog-to-digital converter (ADC) changes according to the operating period to improve the power efficiency. The prototype CIS chip was fabricated using a 0.18-㎛ CMOS process. A 160 × 120 pixel array with 4.4 ㎛ pitch was implemented with a 10-bit SAR ADC. The prototype CIS demonstrated a frame rate of 120 fps with a total power consumption of 1.92 mW.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권4호
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• pp.1406-1423
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• 2014

Multi-mode device which combines multiple access technologies into a device will offer more cost-effective solution than a sole access implementation. Its concurrent multipath transfer (CMT) technology can transmit media flows over multiple end-to-end paths simultaneously, which is essential to select at least two paths from all available paths. At real networks, different paths are likely to overlap each other and even share bottleneck, which can weaken the path diversity gained through CMT. Spurred by this observation, it is necessary to select multiple independent paths as much as possible to avoid underlying shared bottleneck between topologically joint paths. Recent research in this context has shown that different paths with shared bottleneck can weaken the path diversity gained through CMT. In our earlier work, a grouping-based multipath selection (GMS) mechanism is introduced and developed. However, how to estimating the selection is still to be resolved. In this paper, we firstly introduce a Selection Correctness Index (SCI) to evaluate the correctness of selection results in actual CMT experiment. Therefore, this metric is helpful to discuss and validate the accuracy of the output paths. From extensive experiments with a realized prototype, the proposed scheme provides better evaluation tool and criterion in various network conditions.

• 한국정보처리학회논문지
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• 제4권10호
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• pp.2533-2543
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• 1997

컴퓨터 네트워크 장비의 객관적 선정을 위해서는 통신 서비스 품질(Quality of Service : QoS) 개념의 이해와 적용이 요구된다. ITU-T E.800 권고안은 공급자와 고객관점의 서비스 품질 및 만족도 평가 기준을 제시하고 있기 때문에 네트워크 제품 평가 및 선정에 이용될 수 있다. 본 연구에서는 QoS를 고려한 LAN 스위치 평가모형과 선정을 위한 소프트웨어 도구를 개발하였다. 이를 위한 구체적 평가방법으로 효과적인 집단 의사결정을 위한 다기준 평가 모형에서 유용하게 이용되는 Saaty의 계층적 분석방법(Analytic Hierarchy Process : AHP)을 적용하였다. 선정 평가를 위한 자료는 네트워크 전문가들에 대한 설문조사와 현장 조사 방법으로 수집하였다. 그리고 제안된 LAN 스위치 평가 모형에 따라 선정 도구를 구현하고 적용 결과를 분석하였다. 본 연구 결과는 LAN 스위치 선정을 위한 의사결정시 유용한 도구로 활용될 수 있을 것으로 기대되며, 아울러 컴퓨터 네트워크와 관련된 QoS 기반의 평가 및 선정을 위한 의사결정에 적용될 수 있을 것이다.