• 대한물리의학회지
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• 제19권2호
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• pp.91-98
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• 2024

PURPOSE: This study aimed to provide basic clinical data by investigating the impact of Activities of daily living-related dual-task intervention on lung function, balance, and Activities of daily living of stroke patients. METHODS: After sampling 40 stroke patients who met the selection criteria, this study randomly assigned 20 patients who received dual-task exercise intervention to the experimental group and 20 patients who received single exercise intervention to the control group by drawing lots. Next, the study pre-tested their lung function, balance, and activity of daily living. All interventions were conducted for 30 minutes, 3 times a week for 4 weeks, and when all interventions were completed after 4 weeks, lung function, balance, and activity of daily living were re-measured in the same way as the pre-test. RESULTS: In comparing changes in lung function, balance, and activity of daily living within each of the experimental and control groups, statistically significant improvement were found in the experimental group only (p < .01). Statistically significant improvement were also found in lung function, balance, and activities of daily living between the groups (p < .05) (p < .01). CONCLUSION: A statistically significant improvements were found in lung function, balance, and activities of daily living only in the experimental group and statistically significant differences were found between groups. Because they take arm exercises by maintaining balance in a standing position on a labile surface and through dual-task exercise such as folding a towel, moving a cup, and throwing and catching a ball, muscles related to lung function were stimulated and lung function and balance were improved. This helped activities of daily living to be improved. Thus, it is considered that dual-task exercise should be utilized for stroke patients' smooth everyday life.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1289-1294
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• 2003

This paper proposes a novel and efficient intelligent digital redesign technique for a Takagi-Sugeno (TS) fuzzy system. The term of intelligent digital redesign involves converting an existing analog fuzzy-model-based controller into an equivalent digital counterpart in the sense of state matching. In this paper, we suggest the discretization method based on the dual-rate sampling approximation is first proposed, and then attempt to globally match the states of the overall closed-loop TS fuzzy system with the pre-designed analog fuzzy-model-based controller and those with the digitally redesigned fuzzy-model-based controller. To show the feasibility and the effectiveness of the proposed method, a computer simulation is provided.

• 한국국방경영분석학회지
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• 제28권1호
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• pp.47-66
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• 2002

Instead of using signal-to-noise ratio, we attempt to optimize both the mean and variance responses using dual response optimization technique. The alternative experimental strategy analyzes a robust parameter design problem to obtain the best settings that give a target condition on the mean while minimizing its variance. The mean and variance are treated as the two responses of interest to be optimized. Unlike to the crossed array and combined array approaches, our experimental setup requires replicated runs for each control factor's treatment under noise sampling. When the postulated response models are true, they enable the coefficients to be estimated and the desired performance measure to be analyzed more efficiently. The procedure and illustrative example are given for the dual response optimization techniques of nonlinear goal programming.

• 대한전자공학회논문지
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• 제24권2호
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• pp.196-200
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• 1987

The following methods are proposed for implementing digital dual tone multi-frequency (DTMF) receiver: using infinite impulse response(IIR) digital filters, period-counting algorithm, discrete Fourier transform(DFT), and fast Fourier transform(FFT)[2]. The PARCOR(Partical Correlation) analysis method which has been widly used in the speech signal processing area is applied to the dual tone multi-frequency(DTMF) signal detection. This method is easy to implement digitally and stronger to digit simulation of speech than any other methods proposed up to date. Since sampling rate of 4KHz is used in the DTMF receiver for the detection of input DTMF signal originally sampled at 8KHz, it effects two times higher multiplexing efficiency.

• JSTS:Journal of Semiconductor Technology and Science
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• 제17권1호
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• pp.110-119
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• 2017

This paper describes a CMOS image sensor (CIS) with dual correlated double sampling (CDS) and column-parallel analog-to-digital converter (ADC) and its measurement method using a field-programmable gate array (FPGA) integrated module. The CIS is composed of a $320{\times}240$ pixel array with $3.2{\mu}m{\times}3.2{\mu}m$ pixels and column-parallel 10-bit single-slope ADCs. It is fabricated in a $0.11-{\mu}m$ CIS process, and consumes 49.2 mW from 1.5 V and 3.3 V power supplies while operating at 6.25 MHz. The measured dynamic range is 53.72 dB, and the total and column fixed pattern noise in a dark condition are 0.10% and 0.029%. The maximum integral nonlinearity and the differential nonlinearity of the ADC are +1.15 / -1.74 LSB and +0.63 / -0.56 LSB, respectively.

• 전자공학회논문지D
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• 제36D권4호
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• pp.1-7
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• 1999

다양한 이동통신 시스템의 기지국과 중계기 장비에서 입·출력 신호성분의 모니터링을 위한 다양한 형태의 방향성 결합기가 요구된다. 본 논문의 서로 평행한 세 선로로 구성된 방향성 결합기는 서로 다른 결합도를 갖고, 한 결합포트에 부정합이 발생하였을 때 다른 결합포트에 영향을 주지 않는 독립성을 갖는 장점이 있다. 본 논문에서는 비대칭 결합선로를 이용하여 2개의 서로 다른 결합도를 갖는 이중 방향성 결합기의 새로운 해석방법과 설계시 필요한 우 및 기 모드의 임피던스를 구할수 있는 수식을 제시하였다. 유도된 수식을 이용하여 국내에서 운용중인 PCS 대역인 1.7∼2GHz의 주파수 영역에서 각각 20dB와 30dB의 결합도를 갖는 이중 방향성 결합기를 설계, 제작하여 원하는 결합도와 약 40dB의 SHB은 지향성을 얻었고, 측정결과와 시뮬레이션 결과가 잘 일치됨을 보였다.

• 한국통신학회논문지
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• 제12권4호
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• pp.373-385
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• 1987

스케일된 웨이브 디지털 필터는 동적범위의 관점에서 최적화되어야 한다. 변압기 스케일링법은 웨이브 디지털 필터의 각 절점에서 이득을 같게 함으로 동적범위를 최대화하는데 목적이 있다. 본 논문에서는 회로망의 구성법과 샘플링 주파수의 영향을 연구하기 위하여 쌍대인 회로망과 상이한 주파수를 사용하였다. 스케일링 안한 WDF와 비교하면 변압기 스케일링법으로 스케일된 웨이브 디지털 필터에서 SNR이 7~35[dB]정도 개선되었다. 또한 샘플링 주파수가 증가함에 다라서 SNR은 연속적인 강하를 나타냈으나, 스케일링 영향으로 SNR이 강하하는 비율은 감소하였다.

• 센서학회지
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• 제21권5호
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• pp.352-358
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• 2012

A sensor network system can be an efficient tool for healthcare telemetry for multiple users due to its power efficiency. One drawback is its limited data size. This paper proposed a real-time application of data compression/decompression method in u-Health monitoring system in order to improve the network efficiency. Our high priority was given to maintain a high quality of signal reconstruction since it is important to receive undistorted waveform. Our method consisted of down sampling coding and differential Huffman coding. Down sampling was applied based on the Nyquist-Shannon sampling theorem and signal amplitude was taken into account to increase compression rate in the differential Huffman coding. Our method was successfully tested in a ZigBee and WLAN dual network. Electrocardiogram (ECG) had an average compression ratio of 3.99 : 1 with 0.24% percentage root mean square difference (PRD). Photoplethysmogram (PPG) showed an average CR of 37.99 : 1 with 0.16% PRD. Our method produced an outstanding PRD compared to other previous reports.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 V
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• pp.2641-2644
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• 2003

Recently, TRAO Taeduk Radio Astronomy Observatory is developing wide-band digital spectrometer for radio astronomy, which will be used as back-end signal processing unit of Dual channel SIS receiver. So in this paper, we performed development of high speed digitizing sampler for the wide-band digital autocorrelator, which can perform sampling and quantization on pseudo-random gaussian noise with the maximum conversion speed of 1.5 Gsps..

• 한국사회복지학
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• 제60권3호
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• pp.253-274
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• 2008

본 연구는 맞벌이 부부들의 일과 가족생활의 상호작용을 이해하는데 중요한 개념인 전이(spillover)와 교차전이(crossover)에 초점을 맞추어 직장에서 경험한 감정과 퇴근 후 가정에서의 감정 간의 관계의 분석을 통해 이들의 경험을 이해하고자 하였다. 시카고 대학의 Sloan Working Families Study의 연구대상자들을 자료로 경험표집법(Experience Sampling Method)으로 이들의 일상을 탐구하였고 t-검증으로 분석하였다. 분석결과, 긍정적인 감정의 전이는 남녀 모두에게서 발견하였고, 아내의 부정적인 경험이 남편으로 전이하였다. 본 연구에서 발견된 긍정적인 감정의 전이현상은 사회사업 실천가나 연구자가 맞벌이 부부를 연구할 때 일과 가정생활 간의 전이, 교차전이 현상을 일상의 세부적인 요인들을 고려하여 심도있게 관찰, 연구해야 할 필요성이 있음을 시사한다.