• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권5호
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• pp.1316-1332
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• 2012

Formation flying is an important technology that enables high cost-effective organization of outer space aircrafts. The ad-hoc wireless network based on direct-sequence ultra-wideband (DS-UWB) techniques is seen as an effective means of establishing wireless communication links between aircrafts. In this paper, based on the theory of matched filter and error bits correction, a hybrid detection algorithm is proposed for realizing multiuser detection (MUD) when the DS-UWB technique is used in the ad-hoc wireless network. The matched filter is used to generate a candidate code set which may contain several error bits. The error bits are then recognized and corrected by an novel error-bit corrector, which consists of two steps: code mapping and clustering. In the former step, based on the modified optimum MUD decision function, a novel mapping function is presented that maps the output candidate codes into a feature space for differentiating the right and wrong codes. In the latter step, the codes are clustered into the right and wrong sets by using the K-means clustering approach. Additionally, in order to prevent some right codes being wrongly classified, a sign judgment method is proposed that reduces the bit error rate (BER) of the system. Compared with the traditional detection approaches, e.g., matched filter, minimum mean square error (MMSE) and decorrelation receiver (DEC), the proposed algorithm can considerably improve the BER performance of the system because of its high probability of recognizing wrong codes. Simulation results show that the proposed algorithm can almost achieve the BER performance of the optimum MUD (OMD). Furthermore, compared with OMD, the proposed algorithm has lower computational complexity, and its BER performance is less sensitive to the number of users.

• Journal of Preventive Medicine and Public Health
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• 제38권1호
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• pp.61-70
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• 2005

Objectives : To develop a tool for multidimensional measurement of the quality of life, which was psychometrically sound, short, and easy to administer for patients with hypertension. Methods : A sample of 1,115 hypertensive patients aged 20 or above in Cheong-Song County was studied from June 1997 to October 1998. In the development of the instrumental stage, the authors first conceptualized the quality of life. Item generation, item reduction, and questionnaire formatting were followed. Item-level (item descriptive, missing%, item internal consistency, item discriminant validity) analysis, scale-level (scale descriptive, floor and ceiling effect) analysis, and other tests(Cronbach's alpha, inter-dimension correlations, factor analysis, clinical validity) were performed to evaluate the validity and reliability of the new measurement scale. After 1 year, responsiveness and confirmatory factor analysis were performed. Results : The results of both item-level and scale-level analyses were acceptable. An acceptable degree of internal consistency was observed for each of the dimensions (Cronbach's alpha was 0.60 or higher). Inter-dimension correlations were below 0.50 and the factor analysis result was the same as the intended dimension structure. Correlation coefficients between perceived health status, stress and dimensions were proven to be acceptable. The result of comparing dimensional score means among ADL and MMSE-K groups above 60 years was statistically significant(p<0.05). The result of confirmatory factor analysis concluded that the dimensional structure model was well fitted. However, the result of responsiveness test using sensitivity and specificity was unsatisfactory. Conclusions : The newly developed measurement scale is psychometrically reliable and valid instrument for measuring quality of life in hypertensive patients.

• 지역사회간호학회지
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• 제26권1호
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• pp.1-10
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• 2015

Purpose: This study was conducted to investigate changes in cognitive functions, depression and life-satisfaction for elderly participants with mild cognitive impairments participating in an individual cognitive improvement program. Methods: A quasi-experimental with non-equivalent control group pretest-posttest design was implemented. The participants were senior citizens over 65 years of age who had been clinically diagnosed with mild cognitive impairments in G City and J Province (experimental group: 29, control group: 27). The experimental group participated in the individual cognitive improvement program based on Korean traditional tales and games for nine weeks. Results: After the intervention, only the participants in the experimental group reported significant improvement in K-MMSE (t=-2.5, p=.016), MoCA-K (t=-2.6, p=.008), depression (t=3.51, p=.001), and life satisfaction (t=-2.75, p=.008) when compared to those in the control group. Conclusion: These results indicated that the individual cognitive improvement program was effective in improving cognitive functions, depression, and life-satisfaction among the elderly with mild cognitive impairments. Therefore, the application of this individual cognitive improvement program developed in this study by visiting nurses may strengthen the cognitive functions of seniors with mild cognitive impairments.

• 한국직업건강간호학회지
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• 제29권2호
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• pp.114-122
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• 2020

Purpose: This study aimed to identify the effect of integrated nursing using cognicise and neurofeedback on cognition and α waves among elderly individuals. Methods: This quasi-experimental single group pretest-posttest study included 29 Korean adults aged 65 years or older who participated at a senior welfare center in Y city from February to May 2019. Each integrated nursing session consisted of cognicise (10 minutes) and neurofeedback (20 minutes). Subjects participated twice a week for 10 weeks. Structured questionnaires to assess participants' general characteristics and the Korean version of the Mini-Mental Status Examination for Dementia Screening (K-MMSE-DS) were applied. Alpha waves were measured using BrainMaster. Results: Following the integrated nursing program, alpha waves improved in F3 (t=2.41, p=.023), C3 (t=3.00, p=.006), C4 (t=2.60, p=.015), P3 (t=2.43, p=.022), O1 (t=2.30, p=.029), T3 (t=3.05, p=.005), T4 (t=2.28, p=.030), T5 (t=2.91, p=.007), Fz (t=2.30, p=.029), Cz (t=2.73, p=.011), and Pz (t=2.23, p=.034). Most subjects experienced improvement in concentration after participating in the intervention. Conclusion: This study provides evidence for the use of a neuroscientific approach including brain wave measurement to improve cognitive health among community-living elderly people.

• 대한한방내과학회지
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• 제39권3호
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• pp.338-349
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• 2018

Objective: The purpose of this study is to investigate recent clinical studies on the effects of acupuncture on dementia. Method: We searched RCTs (randomized controlled trials) using the database PubMed (2000-2018). Clinical RCT studies of acupuncture used to treat dementia in humans were included. Nine randomized controlled trials were included. Results: Various acupoints such as Baihui (GV20), Sishencong (EX-HN1), Fengchi (GB20), and Shenting (GV24) were used to treat symptoms. The studies reported a decrease in evaluation criteria, such as the Mini Mental State Examination (MMSE) and activities of daily living (ADL), for measuring cognitive ability. The acupuncture process, the results for outcome measure, and the effectiveness of studies were analyzed. We then assessed "risk of bias." Conclusions: Through this review, we found that acupuncture is applicable for the treatment of dementia. This can be used for future study.

• 한국융합학회논문지
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• 제9권5호
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• pp.219-229
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• 2018

본 연구는 서울 경기에 거주하며 운동에 참여하는 65세 이상 274명을 대상으로 노인의 운동참여, 근육량, 근력과 인지기능의 정량적 지표를 토대로 이들 간의 관계성을 규명하고자 하였다. 자료수집은 연구대상자의 운동참여(참여 빈도, 참여 시간), 근육량, 근력(상지근력, 하지근력), 인지기능(한국판 간이정신상태검사, 숫자 바로 읽기, 숫자 거꾸로 읽기)을 측정하여 자료를 수집하였다. 일련의 타당성 있는 연구절차를 통하여 도출된 결론은 다음과 같다. 첫째, 노인의 운동참여, 근육량, 근력, 인지기능 간에는 통계적 유의한 상관관계가 나타났다. 둘째, 노인의 운동참여는 근육량, 근력, 인지기능에 정적(+) 영향력을 나타내었다. 셋째, 노인의 근육량은 근력, 인지기능에 통계적 유의한 정적(+) 영향력을 나타내었다. 넷째, 노인의 근력은 인지기능에 정적(+) 영향력을 나타내었다.

• PNF and Movement
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• 제7권4호
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• pp.9-16
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• 2009

Objective : The purpose of this study was to analyze the effect on psychosocial status in elderly women with chronic low back pain after practicing lumbar stabilizing exercise using the gym ball, and to developed and activated on exercise program for healthy senile life. Methods : The subjects were 23 elderly women with chronic low back pain. Mean age of subjects was $67{\pm}13$ years. The lumbar stabilizing exercise using the gym ball was performed 3 times a week during the 8 weeks study period. The research tool were ODI(Oswestry Disability Index), VAS(Visual Analogue Scale), SES(Self-esteem Scale), GDSSF-K(Geriatric Depression Scale Short Form Korea Version), PSS (perceived stress scale), Life satisfaction, and MMSE-K. The analysis of data was processed by the statistical program SPSS 12.0 and paired t-test and frequency analysis were used to compare psychosocial status between the pretest and post tests. Result : The lumbar stabilizing exercise using the gym ball increased significantly SES and Life satisfaction of subjects, and ODI, VAS(trunk flexion & trunk extention), GDSSF-K, and PSS were decreased significantly(p<.05). While VAS(trunk rotation) were not significantly. Conclusion : The lumbar stabilizing exercise using the gym ball improved psychosocial status in elderly women with chronic low back pain.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권10호
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• pp.2448-2463
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• 2013

The traditional block-based motion compensation methods in frame rate up-conversion (FRUC) only use a single uniquely motion vector field. However, there will always be some mistakes in the motion vector field whether the advanced motion estimation (ME) and motion vector analysis (MA) algorithms are performed or not. Once the motion vector field has many mistakes, the quality of the interpolated frame is severely affected. In order to solve the problem, this paper proposes a novel joint overlapped block motion compensation method (8J-OBMC) which adopts motion vectors of the interpolated block and its 8-neighbor blocks to jointly interpolate the target block. Since the smoothness of motion filed makes the motion vectors of 8-neighbor blocks around the interpolated block quite close to the true motion vector of the interpolated block, the proposed compensation algorithm has the better fault-tolerant capability than traditional ones. Besides, the annoying blocking artifacts can also be effectively suppressed by using overlapped blocks. Experimental results show that the proposed method is not only robust to motion vectors estimated wrongly, but also can to reduce blocking artifacts in comparison with existing popular compensation methods.

• 전자공학회논문지
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• 제52권5호
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• pp.33-47
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• 2015

셀룰러 네트워크에서 기지국의 과부하를 줄이고 주파수 부족 현상을 완화시킬 수 있는 D2D(Device-to-Device) 통신에 대한 연구가 활발히 진행되고 있다. 하지만 셀룰러 네트워크의 상향링크 주파수 자원을 공유함으로써 상호간의 간섭은 증가하게 된다. 본 논문에서는 셀룰러와 D2D 사이의 간섭을 줄이기 위하여 새로운 하이브리드 수신기 FSC(Full Suppression Cancellation)를 제안한다. 제안한 수신기는 IRC(Interference Rejection Combining)와 SIC(Successive Interference Cancellation)를 결합하여 간섭을 억제 및 제거 할 수 있다. 시스템 레벨 시뮬레이션은 3GPP LTE-A 시스템의 20MHz 대역을 기반으로 이루어 졌으며, 시뮬레이션 결과 제안한 수신기를 통해 기존 수신기보다 SINR, 전송률 및 스펙트럼 효율 측면에서 성능 향상을 가져다주는 것을 확인하였다.

• 한국보건간호학회지
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• 제17권1호
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• pp.69-82
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• 2003

Purpose: The purpose of this research was to evaluate the effect of horticultural therapy on cognitive function, self-esteem, depression and activities of daily living of elderly with dementia. Method: The research design was an one group pre and post-test study design. The subjects of this study were 7 elderly with dementia in K elderly institution in Daegu. Instruments used in this research were MMSE-K(Mini-mental state Examination Korean Version) developed by Kwon & Park, SES(Self-Esteem Scale) developed by Rosenberg. SDS(Self-Rating Depression Scale) developed by Zung and BADL(Bathel Activity Daily Living) developed by Bethel. One-hour horticultural therapy was offered to the study participants weekly for 12 weeks. Results: The results showed that self-esteem was significantly increased after the horticultural therapy. However, in terms of cognitive function. depression and ADL, there was no significant change after the horticultural therapy among these elderly. Conclusion: In this research. there were no obvious change in cognitive function. depression, and ADL after the horticultural therapy among participants. Although the difference was not statistically significant. descriptive statistics showed some difference in scores on these variables after the intervention. So, it is suggested to conduct a further research with larger samples and pre and post-test design with control group.