Background: Physical activity and quality of life (QOL) influence the health status of older adults. Recently, the use of wearable devices to monitor physical activity has increased. Objects: This study examined the relationship between the amount of physical activity, measured using a wearable device, and QOL among older adults. Methods: In total, 71 older adults (aged ≥ 65 years) were enrolled. The amount of physical activity was measured using a wearable device with a wrist strap, and daily physical activity was classified according to intensity (sedentary, light, moderate, or very active). Self-reported QOL was evaluated using the Short Form 36 (SF-36) questionnaire. Pearson and Spearman correlation analyses were conducted to analyze parametric and non-parametric variables, respectively. The relationship between amount of daily physical activity and SF-36 scores was assessed. Results: The correlation analyses revealed positive correlations between the amount of moderate- intensity and very active physical activity (minutes/day) and SF-36 scores (p < 0.05). Conclusion: Physical activity of at least moderate intensity is associated with better QOL in older adults. Further studies are required to verify the effects of increased physical activity on QOL in older adults.

This study aims to understand the opening efficiency of the finless porpoise escape guide net by the type of extension net that is the part to which the escape guide net is attached in stow net. To this end, extension nets were manufactured in full size and the net mouth area and towing tension were investigated according to the towing speed (0.2, 0.4, 0.6 and 0.8 m/s) and the type of extension net (25 mm net and raschel net) in the water tank. As a result, the net mouth area of the guide net was larger when the raschel net was used for the extension net than when the 25 mm net was used under all towing speeds. In addition, regardless of the type of extension net, the net mouth area reached about 80% of the maximum value at a towing speed of 0.4 m/s. In the field, fishing operation of stow net is performed only when the current speed is above 0.4 m/s. Therefore, the speed of 0.4 m/s was confirmed as a meaningful value to determine whether it is possible to operate. As a result of analyzing the relationship between the net mouth area of the guide net and the towing tension, it was confirmed that the difference in the net mouth area of the guide net according to the type of the extension net was due to the difference in the solidity ratio.

This paper proposes a mathematical model that can calculate the luminescence characteristics driven by alternating current (AC) power using the current-voltage-luminance (I-V-L) properties of organic light emitting devices (OLED) driven by direct current power. Fluorescent OLEDs are manufactured to verify the model, and I-V-L characteristics driven by DC and AC are measured. The current efficiency of DC driven OLED can be divided into three sections. Region 1 is a section where the recombination efficiency increases as the carrier reaches the emission layer in proportion to the increase of the DC voltage. Region 2 is a section in which the maximum luminous efficiency is stably maintained. Region 3 is a section where the luminous efficiency decreases due to excess carriers. Therefore, the fitting equation is derived by dividing the current density and luminance of the DC driven OLED into three regions, and the current density and luminance of the AC driven OLED are calculated from the fitting equation. As a result, the measured and calculated values of the AC driving I-V-L characteristics show deviations of 4.7% for current density, 2.9% for luminance, and 1.9% for luminous efficiency.

목적 : 본 연구는 장애인 근로자들에게 최적의 보조공학 서비스를 제공하기 위해서 보조공학 서비스 지원사업과 관련이 있는 장애인 근로자와 실무자를 대상으로 보조공학기기 서비스 HUB 구축의 타당성을 알아보고자 하였다. 연구방법 : 보조공학기기 서비스 HUB 구축의 타당성을 알아보기 위해 현상학적 연구를 사용하였다. 본 연구의 대상자는 보조공학 서비스 지원사업과 관련 있는 장애인 근로자, 사업주, 납품업체, 공단 관계자 및 보조공학 전문가로 총 24명을 대상으로 하였다. 자료 수집을 위해 면담 조사를 이용하였고, 녹음한 면담 내용은 전사하고 분석하였다. 결과 : 연구 결과는 중심주제 3개와 구성요소 6개, 의미 단위 16개를 도출하였다. 연구 결과는 보조공학기기 서비스 HUB 구축의 필요성, 보조공학 서비스 지원사업의 개선방안, 보조공학기기 서비스 HUB의 운영방안을 주제로 분석하였다. 보조공학기기 서비스 HUB 구축의 필요성은 보조공학 서비스에서 필요한 사항과 현재 보조공학 서비스의 문제점을 통해 인지하게 되었고, 보조공학 서비스 지원사업의 개선방안은 보조공학 서비스 절차에 대한 개선과 지원에 대한 확대로 인지하였으며, 보조공학기기 서비스 HUB의 운영방안은 요구되는 인력과 기능과 지원 및 품목관리를 중요하게 생각하였다. 결론 : 보조공학기기 서비스 HUB 구축에서 중요한 것은 보조공학기기에 대한 전문적인 정보 및 상담을 통한 맞춤형 서비스를 지원으로 나타났다. 본 연구의 결과로 보조공학기기 서비스 HUB 구축되어 장애인 근로자들에게 안정적이고 생산적인 직업생활로 이끌어 삶의 질이 향상되기를 기대한다. 이를 통하여 보조공학기기 서비스 HUB 구축의 방향을 설정하고, 국내의 보조공학 관련 제도를 위한 기초자료가 되고자 한다.

팽이버섯 재배사의 Listera속 미생물 살균을 위하여 공기 살균 장치가 부착된 파일럿 버섯 재배사를 개발하여 물리적, 화학적 살균처리에 대한 살균 효과 검증실험을 수행하였다. 파일럿 버섯 재배사의 내부 온도는 상부 6.62˚C±0.30, 중간 6.46˚C±0.24, 하부 6.48˚C±0.25, 습도 는 79.97%±4.42, 79.43%±4.06, 79.94±4.30%로 설정 온도 6.5˚C, 상대습도 75%에 근사하게 제어되었다. 공기 살균 장치 적용에 적합한 팽이버섯 재배단계는 생육단계 조건인 온도 6.5~8.5˚C, 습도 70~80% 범위였고 유사 조건에서 이온 클러스터 발생기의 오존 발생농도는 160 ppb 수준으로 나타났다. 물리적 살균처리 후 Listeria innocua 의 생존율은 이온클러스터 살균의 경우 0.1~0.9%, UV공 기 살균은 9.3~10.6%로 나타났고, 화학적 살균처리인 75% 에탄올과 3% 유기산 수용액 처리구에서는 모두 사멸하는 것으로 나타났다. 소재에 대한 Listeria innocua 생존율은 금속시편의 경우 9.3~10.6%, 플라스틱 권지 9.9~16.2%로 나타났는데, 특히 권지의 거친면에서 생존율이 높게 나타났다. 본 연구 결과에 따르면 버섯 재배사의 Listeria균 발생을 억제하기 위해서 금속 소재로 구성된 재배사 벽면과 재배 선반에 대해서는 이온클러스터 공기 살균처리가 노동력을 절감하면서 살균 가능한 방법이며, 플라스틱 재질의 권지의 경우 화학적 살균처리가 효과적 인 것으로 나타났다.

초록  In this study, the structural analysis of sway brace device for earthquake-proof which can fix a pipe installed in the building was carried out. The sway brace device was analyzed to evaluate not only the deformations of adaptor fitting, support brace member, structure attachment fitting and clamp sway brace fitting that compose it, but also the effective stress of adaptor fitting combined with support brace member by shear bolt. As a result of structural analysis, it can be seen that the deformation of support brace member influences most of the deformation of sway brace device and the design of adaptor fitting must be modified. Above all, it indicates that the sway brace device is suitable for Korea Fire Institute(KFI) approval standard since its total deformation is smaller than the maximum displacement proposed by KFI. The result of this study can be effectively used to investigate the effective stresses and deformations without the performance test of sway brace device according to its setting angle.

NDF (No Defect Found) is a phenomenon in which defects have been found in the manufacturing, operation and use of a product or facility, but phenomenon of defects is not reproduced in the subsequent investigation system or the cause of the defects cannot be identified. Recently, with the development of the fourth industrial revolution, convergence of hardware and software technologies in various fields is spreading to products such as aircraft, home appliances, and mobile devices, and the number of parts is increasing due to functional convergence. The application of such convergence technologies and the increase in the number of parts are major factors that lead to an increase in NDF phenomena. NDF phenomena have a significant negative impact on cost, reliability, and reliability for both manufacturers, service providers and operators. On the other hand, due to the nature of NDF phenomena such as difficult and intermittent cause identification and ambiguity in judgment, it is common to underestimate the cost of NDF or fail to take appropriate countermeasures in corporate management. Therefore, in this paper, we propose a methodology for estimating NDF costs by the PAF model which is a quality cost analysis model and ABC (Activity Based Costing) technique. The methodology of this study suggests a detailed procedure and the concept to accurately estimate the NDF costs, using ABC analysis, accounting system information, and IT system data. In addition case studies have validated the methodology. We think this could be a valid methodology to refer to when estimating the cost of other parts. And, it is meaningful to provide important judgment information in the decision-making process based on quality management and ultimately reduce NDF costs by visualizing them separately by major variable factors.

이 논문은 드럼 세트를 구성하는 악기들 중 스네어 드럼에 사용되는 진동제어장치의 크기와 질량의 변화에 따라 음량과 음색 및 엔벨로프가 어떻게 변화되는지에 대해 연구하였다. 스네어 드럼을 사용하여 연주하는 드럼 연주자 및 음향 엔지니어들에게 진동제어장치의 변화에 따라 도출되는 소리의 특성을 제공하여 표현하고 싶은 스네어 음색을 구사할 수 있는 정보를 제공하는 목적을 가지고 있으며 스네어 드럼의 음색을 구사하는 능력이 향상된다는 것은 음악의 장르와 스타일에 따라 연주자 및 음향 엔지니어의 표현 능력이 향상될 수 있는 긍정적 영향을 끼칠 수 있다. 실험 결과 진동제어장치를 사용하여 면적과 질량의 변화를 준 환경에서 라우드 니스의 변화는 발생하지 않았으며, 주파수 응답의 변화는 미미한 수준이었고, 엔벨로프의 길 이에서는 큰 변화가 발생하였다. 실험과정에서 실제로 듣는 청감상의 스네어 드럼 음색 변화는 매우 크게 나타났으며 특히 질량보다는 면적의 변화에 따른 실험환경에서 큰 음색 변화가 있었다. 결과적으로 진동제어장치는 실질적으로 엔벨로프에만 관여하며, 스네어 드럼은 엔벨 로프의 길이가 짧아 엔벨로프의 앞부분에서 발생하는 음색이 더 중요하다는 일부 인식과 달 리, 엔벨로프의 뒷부분도 인간이 지각하는 음색에 큰 영향을 준다는 연구들이 도출되었다.

With the development of technology, innovations are taking place in the education field, with smart device-based Chinese educational applications drawing attention. This study examines the current status of Chinese educational applications in Korea, China, and the U.S., and explores possible directions to design effective applications for Korean young learners. A total of 179 applications from three countries were investigated and classified based on educational application criteria. Among them, the top five applications were selected from each country using ratings and reviews. Each application was then evaluated and analyzed according to the evaluation criteria. The results demonstrated that applications from the U.S. were the highest scoring overall and highest in terms of content, with applications from China highest in terms of function. The result also presented three common problems, which are limited types of applications, the absence of camera function utilization, and the lack of learning activities to experience Chinese culture. This study recommends further discussions on Chinese educational applications with the broadened scope of application types and target learners.