• 한국전문물리치료학회지
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• 제11권3호
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• pp.59-70
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• 2004

The purpose of this study was to propose a task-related circuits program for stroke patients and to test the difference in functional improvements between patients undergoing conventional physical therapy and those participating in a task-related circuits exercise program. The subjects were 10 stroke in-patients of the Korea National Rehabilitation Center in Seoul. We measured the following variables: Motor Assessment Scale (MAS), Berg Balance Scale (BBS), Tone Assessment Scale (TAS), speed of gait, rate of step, physiological costs index, age, weight, height, site of lesion, onset day and whether the subject participated in an exercise program. Collected data were statistically analyzed by SPSS 10.0/PC using descriptive statistics, Mann-Whitney U test, Wilcoxon rank sum test and Spearman's correlation. The results of the experiment were as follows: (1) In the pre-test and post-test for function, there was not a statistical significance between the group partaking in a task-related circuits program and the group of conventional physical therapy (p>.05). (2) In the MAS, BBS and speed of gait test, the group undergoing conventional physical therapy showed a statistical significance (p<.05). (3) In the MAS, BBS, speed of gait, PCI, TAS (passive, associated reaction, TAS total score), the group of task-related circuits program showed a statistical significance (p<.05). As a result, the group participating in a task-related circuits program had a more functional improvement than the group participating in conventional physical therapy. Therefore, an intervention recommended for a stroke patient would be a task-related circuits program consisting of a longer session of each task for a more improved functional recovery.

• Journal of the Korean Data and Information Science Society
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• 제8권2호
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• pp.163-171
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• 1997

공학 분야에서 신경망에 대한 관심은 신호처리, 로보틱스, 컨트롤, 문자인식, 패턴인식 그리고 컴퓨터 그래픽 분야등에서 연구되고 있으며, 이들은 함수근사응용과 밀접한 관련이있다. 통계학 분야에서는 패턴인식의 판별분석, 주성분분석, 회귀분석 그리고 군집분석을 위한 신경망등에 대한 연구가 활발히 이루어지고 있다. 문자인식을 위한 다층 신경망을 학습시키기 위해 역전파 알고리즘이 널리 사용되고 있으나 이 알고리즘은 긴 훈련기간, 극소점 문제, 이상치(outlier)에 민감하다는 단점을 지니고 있다. 이상치에 민감한 일반적인 역전파 알고리즘의 단점을 극복하기 위해 이상치에 민감하지 않은 로버스트 알고리즘의 필요성이 대두되었다. 본 논문에서는 통계물리에서 자주 사용하는 방법을 이용하여 제안한 로버스트 역전파 알고리즘을 문자인식에 적용하여 일반적인 역전파 알고리즘의 문자인식 성능과 비교하였다.

• 한국전자파학회논문지
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• 제22권10호
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• pp.966-980
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• 2011

레이더는 표적으로부터 반사된 신호의 크기, 도플러 속도로부터 표적의 거리, 속도 정보를 알 수 있으며, 이런 반사 신호의 특징들은 표적의 반사 특성과 기동에 의해 결정된다. 표적의 위치 정보에 대한 각도 오차는 합채널에 대한 차채널의 크기 비로부터 추출된다. 본 논문에서는 다기능 레이더의 성능을 평가하고 분석하기 위한 레이더 반사 신호 모의 장치(RSSE)에 대해 소개하였다. 개발된 레이더 반사 신호 모의 장치는 다채널 직접 디지털 합성(MC-DDS)을 이용하여, 재밍 신호를 포함한 다중 표적 환경을 모사할 수 있도록 구현되었으며, 효율적인 하드웨어 구조 설계를 통해 모사할 수 있는 표적의 수를 용이하게 확장할 수 있도록 설계되었다. 개발된 모의 장치의 요구 성능 및 기능을 시험 환경에서 확인하였으며, 신호 처리기(RSP)와의 연동 시험 구성에서 표적 탐지 성능을 입증하였다.

• 동의신경정신과학회지
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• 제13권1호
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• pp.19-37
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• 2002

Objectives : This study sought to define autonomic functional difference on heart rate variability between headache patients and normal subjects Methods : We determined, heart rate variability of 52 headache patients and 30 normal subjects by means of three time domain measures: Mean PR(mean pulse rate), SDNN(standard deviation of all normal R-R intervals), RMSSD(the square root of the mean of sum of the squares of differences between adjacent normal R-R intervals), and five frequency domain measures: TP(total power), VLF(very low frequency), LF(low frequency), HF(high frequency). Results : 1) RMSSD, TP, HF, HF Norm of HRV decreased with aging and LF Norm, LF/HF increased with aging in headache patients. 2) There was no significant differences between migraine and tention headache in any standard index of HRV, whereas, HRV of total headache patients were smaller than those of normal subjects. 3) In the gender comparison, SDNN, RMSSD, HF of tention headache patients were the smallest and then migraine patients, normal subjects in order with man, whereas, LF Norm, LF/HF of normal subjects were the smallest with man. RMSSD of migraine patients were the smallest and then tention headache patients, normal subjects in order with women. 4) In the term of history of headache patients, SDNN, RMSSD were getting lower as long term. 5) There was no significant differences of HRV in physical symptom of headache patients. Conclusions : All of these results show that standard index of HRV of headache patients were significantly different with normal subjects.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.158-164
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• 1999

This paper investigated and evaluated the NASA's Shuttle Imaging Radar-C (SIR-C) multiple frequency SAR data for differential backscattering effects of microwave from the surface geological materials overlying the skarn type mineralization. Although an integrated approach in mineral exploration is more cost effective and is well in use, there are still many technical and scientific issues to be further investigated and researched. In this study we have reprocessed several sets of previously surveyed exploration data and experimented with fuzzy logic digital fusion of the preprocessed data with respect to chosen exploration targets. Among the numerous fuzzy logic operators, which are currently available for a data driven integrated exploration strategy, we used varying combinations of fuzzy MIN, fuzzy MAX, and fuzzy SUM operators along with Gamma operator for fusion of exploration data, including the contact metamorphic zone information. The final exploration target tested was a skarn type W-Mo-F mineralization in the study area. The fuzzy logic derived mineral potential anomaly almost exactly matched the differential backscattering anomalies on the C-band and L-band SIR_C data when overlaid on each other. Although this high degree of correlation between these two data sets is remarkable, the differential backscattering anomaly over the skarn type W-Mo-F mineralization in the study area requires further investigation.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2011년도 한국우주과학회보 제20권1호
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• pp.20.1-20.1
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• 2011

We present the results of far-ultraviolet (FUV) observations of comet C/2001 Q4 (NEAT) obtained with Far-ultraviolet Imaging Spectrograph (FIMS) on board the Korean microsatellite STSAT-1, which operated at an altitude of 700 km in a sun-synchronous orbit. FIMS is a dual-channel imaging spectrograph (S channel 900-1150 ${\AA}$, L channel 1350-1750 ${\AA}$, ${\lambda}/{\Box}{\lambda}$ ~ 550) with large image fields of view (S: $4^{\circ}.0{\times}4'.6$, L: $7^{\circ}.5{\times}4'.3$, angular resolution 5'-10') optimized for the observation of diffuse emission of astrophysical radiation. Comet C/2001 Q4 (NEAT) was observed with a scanning survey mode when it was located around the perihelion between 8 and 15 May 2004. Several important emission lines were detected including S I (1425, 1474 ${\AA}$), C I (1561, 1657 ${\AA}$) and several emission lines of CO $A1{\cap}-X1{\sum}+$ system in the L channel. We estimated QCO = ($2.58\;{\pm}\;0.64)\;{\times}\;1028$ s-1 from the production rate of CO 1510 ${\AA}$. We obtained L-channel image which have map size of $5^{\circ}{\times}5^{\circ}$. The image was constructed for the wavelength band of L-channel (1350-1750 ${\AA}$).We also obtained radial profile of S I, C I, CO with line fitting from central coma.

• 대한한의학회지
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• 제16권1호통권29호
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• pp.475-498
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• 1995

For the purpose of developing Korean Herbalogy with the plants of Urticaceae which grow wild and is planted in Korea, the these and writings on herbalogy, from literature of successive generations, have been thoroughly investigative and the results obtained were as follows: 1. There were totaled 11 genera and 44 species in Korea and among them medecinal plants are 9 genera, 19 species, some 43% in total but the number of species may be added because of similar plants. 2. According to the oriental name which can be used for medical purpose, the medicinal plants beloning to the Urticaceae were classified as Herba 10, Radix 8, Folium 3, Cortex 1, Flos 1, Rhizoma 1. Thus it was noticed that Herba was the main kind. 3. According to sum of 44 species in Urticaceae they were classified into Boehemeria genera 18, Urtica genera 9, Pliea genera 5, Elastosma genera 3, Parietaria genera 2, Pellionia genera 2, Achudemia 1, Debregeasia genera 1, Girardinia genera 1, Laportea genera 1, Nanocnide genera 1 etc. Thus it was noticed that Boehemeria genera was the main kind, some 41% in total. 4. According to nature and flavour of medicinal plants, they were classified into cold, cool; 6 each, wormth, heat; 4 each, balance 3. Thus it was noticed that cold and cool is the main in nature and flavour of medicinal plants. 5. According to the Properties and Principal Curative action, they were classified into, clearing up heat and toxin 9, drugs for urination an removing abscess 7, drugs for circulating blood and hemostasis 7, drugs for expelling wind 5, drugs for comporting embryo 4, 6. Comparing to whole medicinal plants 44 kinds, toxic durgs include minor toxin were 2 kinds, 5% of the whole. Thus toxic durgs were rare. From this result, It was revealed that the plants for medical purpose in Urticaceae was 43% kinds of the whole, in which Herba was mostly abundunt, toxic plants were so rare that it will be used for clinical treatments more easily. It is considered that many clinical experiments and approaches must be continued to use widely.

• 한국안전학회지
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• 제31권5호
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• pp.95-101
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• 2016

This study proposes a multi-scale dynamic system reliability analysis of control system as a method of quantitative evaluation of its performance in probabilistic terms. In this second paper, we discuss the control effect of the viscous damper on the seismic performance of the structure-level failure. Since the failure of one structural member does not necessarily cause the collapse of the structural system, we need to consider a set of failure scenarios of the structural system and compute the sum of the failure probabilities of the failure scenarios where the statistical dependence between the failure scenarios should be taken into account. Therefore, this computation requires additional system reliability analysis. As a result, the proposed approach takes a hierarchial framework where the failure probability of a structural member is computed using a lower-scale system reliability with the union set of time-sequential member failures and their statistical dependence, and the failure probability of the structural system is again computed using a higher-scale system reliability with the member failure probabilities obtained by the lower-scale system reliability and their statistical dependence. Numerical results demonstrate that the proposed approach can provide an accurate and stable reliability assessment of the control performance of the viscous damper system on the system failure. Also, the parametric study of damper capacity on the seismic performance has been performed to demonstrate the applicability of the proposed approach through the probabilistic assessment of the seismic performance improvement of the damper system.

• 한국정보통신학회논문지
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• 제15권4호
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• pp.921-929
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• 2011

본 논문에서는 모바일 WiMAX용 layered LDPC(low-density parity-check) 복호기의 복호성능 및 복호 수렴속도 분석을 통해 LDPC 복호기의 하드웨어 구현을 위한 최적의 설계조건을 탐색하였다. 최소합 알고리듬과 layered 복호방식을 적용한 LDPC 복호기의 고정소수점 Matlab 모델을 개발하고 시뮬레이션 하였다. IEEE 802.16e 표준에 제시된 블록길이 576, 1440, 2304 비트와 부호율 1/2, 2/3A, 2/3B, 3/4A, 3/4B, 5/6에 대해 고정소수점 비트 폭, 블록길이, 부호율 등이 복호성능에 미치는 영향을 분석하였으며, 고정소수점 비트 폭이 8 비트 이상이고 정수부분이 5 비트 이상일 때 안정된 복호성능이 얻어짐을 확인하였다.

• 한국정보통신학회논문지
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• 제17권2호
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• pp.363-371
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• 2013

본 논문에서는 IEEE 802.16e 모바일 WiMAX 표준의 19가지 블록길이(576~2304)에 따른 6가지 부호율(1/2, 2/3A, 2/3B, 3/4A, 3/4B, 5/6)과 IEEE 802.11n WLAN 표준의 3가지 블록길이(648, 1296, 1944)에 따른 4가지 부호율(1/2, 2/3, 3/4, 5/6)을 지원하는 다중표준 LDPC 복호기를 설계하였다. Layered 복호방식의 블록-시리얼(부분병렬) 구조와 SM(sign-magnitude) 수체계 기반의 DFU(decoding function unit)를 적용하여 하드웨어 복잡도를 최소화시켰다. 설계된 회로는 FPGA 구현을 통해 하드웨어 동작을 검증하였으며, 0.13-${\mu}m$ CMOS 셀 라이브러리로 합성한 결과 약 312,000 게이트와 70,000 비트의 메모리로 구현되었고, 100 MHz@1.8V로 동작하여 79~210 Mbps의 성능을 갖는 것으로 평가되었다.