• 벤처혁신연구
• /
• 제5권2호
• /
• pp.35-48
• /
• 2022

본 연구는 창업의지에 미치는 영향을 분석하고 어떤 요인이 가장 큰 영향을 미치는지에 대해 실증적으로 분석하기 위해 이루어졌다. 이를 위해 창업의지에 미치는 영향요인으로 자아성취동기, 간접경험, 롤모델, 사업가에 대한 인식, 실패부담감을 독립변수로 설정하였다. 이를 실증적으로 분석하기 위하여 일반인을 대상으로 유효한 데이터 399개를 분석 대상으로 하였다. 통계분석에는 SPSS 25.0를 활용하였다. 본 연구의 실증 분석 결과, 자아성취동기, 간접경험, 롤모델, 사업가에 대한 인식, 실패부담감은 창업의지에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 본 연구 결과는 창업의지에 영향을 미치는 요인 중에서도 자아성취동기가 가장 큰 영향을 미치는 것을 확인하였으며, 이론형 창업강좌, 창업특강, 부모나 지인들의 창업 유무 등 간접경험과 롤모델이 창업의지에 영향을 미치는 것을 실증적으로 분석하였다는 측면에서 의의가 있다.

• 디지털정책학회지
• /
• 제2권4호
• /
• pp.25-32
• /
• 2023

논문은 PPG 기반 센서에서 측정한 심박수(HR), 심박변이도(HRV) 데이터를 기반으로 DNN(Deep Neural Network) 혈당예측 모델을 개발하는 연구이다. 혈당 예측은 다층퍼셉트론(MLP) 신경망을 이용하였다. DNN 심층학습은 11의 독립변수가 있는 입력층, 은닉층, 출력층으로 구성된다. 혈당 예측모델의 학습결과는 MAE=0.3781, MSE=0.8518, 및 RMSE=0.9229이며, 결정계수(R²)는 0.9994이다. PPG기반의 디지털기기를 이용한 비채혈적 생체신호를 이용하여 혈당관리의 가능성을 확인하였다. PPG기반의 표준화된 활력신호 획득 및 해석법, 다량의 데이터기반 심층학습(Deep Learning)의 데이터셋, 정확성를 실증하는 연구가 이어진다면 개의 혈당관리에 편이성과 대안적인 방법을 제공할 수 있을 것이다.

• 한국전문물리치료학회지
• /
• 제31권1호
• /
• pp.72-78
• /
• 2024

Background: Limitations of shoulder range of motion (ROM), particularly shoulder internal rotation (SIR), are commonly associated with musculoskeletal disorders in both the general population and athletes. The limitation can result in connective tissue lesions such as superior labrum tears and symptoms such as rotator cuff tears and shoulder impingement syndrome. Maintaining the center of rotation of the glenohumeral joint during SIR can be challenging due to the compensatory scapulothoracic movement and anterior displacement of the humeral head. Therefore, observing the path of the instantaneous center of rotation (PICR) using the olecranon as a marker during SIR may provide valuable insights into understanding the dynamics of the shoulder joint. Objects: The aim of the study was to compare the displacement of the olecranon to measure the rotation control of the humeral head during SIR in individuals with and without restricted SIR ROM. Methods: Twenty-four participants with and without restricted SIR ROM participated in this study. The displacement of olecranon was measured during the shoulder internal rotation control test (SIRCT) using a Kinovea (ver. 0.8.15, Kinovea), the 2-dimensional marker tracking analysis system. An independent t-test was used to compare the horizontal and vertical displacement of the olecranon marker between individuals with and without restricted SIR ROM. The statistical significance was set at p < 0.05. Results: Vertical displacement of the olecranon was significantly greater in the restricted SIR group than in the control group (p < 0.05). However, no significant difference was observed in the horizontal displacement of the olecranon (p > 0.05). Conclusion: The findings of this study indicated that individuals with restricted SIR ROM had significantly greater vertical displacement of the olecranon. The results suggest that the limitation of SIR ROM may lead to difficulty in rotation control of the humeral head.

• PNF and Movement
• /
• 제22권1호
• /
• pp.129-137
• /
• 2024

Purpose: The aim of this study was to investigate and compare the risk factors focusing on the neck and lower back between general workers (GW) and mild intellectual disability workers (MIDW) in the automobile manufacturing industry. Methods: A total of 32 participants were required for this study design to achieve 80% power, 0.9 effect size, and an alpha level of 0.05. Each group consisted of 16 subjects, including GW and MIDW. Pain levels in the neck and lower back were measured for all participants using the visual analog scale (VAS). A dual digital inclinometer was used to measure the range of motion (ROM) in the neck and lower back three times, and the average was used for analysis. The independent t-test was used to compare between the wo groups. Cohen's d effect analysis was employed to determine the effect size. The significant level was set at 0.05. Results: In the MIDW, neck pain was significantly higher, and left cervical flexion was significantly decreased compared with the GW. There was no significant difference in lower back pain between the MIDW and GW. However, both lumbar flexion and extension, as well as lateral flexion, were significantly reduced in the MIDW compared with the GW. Conclusion: This study reveals that MIDW working in the automobile manufacturing industry have a greater risk of neck pain, limitation in left cervical flexion, and overall restriction in the ROM of the lower back compared with GW.

• PNF and Movement
• /
• 제22권1호
• /
• pp.13-21
• /
• 2024

Purpose: This study investigated the effects of side walking training combined with squats on the balance and gait ability of stroke patients. The purpose of this study was to provide fundamental data regarding the use of side walking training combined with squats among stroke patients. Methods: Thirty patients with stroke were randomly divided into an experimental group (n=15) that underwent side walking training combined with squats and a control group (n=15) that performed general rehabilitation exercises. Both groups performed their respective exercises for 30 minutes, five times a week for six weeks. Balance was assessed using the functional reach test and timed up and go test, while gait ability was evaluated using the 10-meter walk test. A paired t-test was performed to compare within-group changes before and after the intervention. Differences between the experimental and control groups were analyzed using an independent t-test. For all tests, the level of statistical significance was set at α=0.05. Results: After the exercise, significant within-group improvements in balance and gait ability were observed in both the experimental and control groups (p<0.05). There was also a significant between-group difference in balance and gait ability following the intervention (p<0.05). Conclusion: While general rehabilitation is commonly employed in treating stroke patients and is relatively effective, the application of side walking training combined with squats may offer additional benefits in terms of improving balance and gait ability in these patients.

• Restorative Dentistry and Endodontics
• /
• 제49권1호
• /
• pp.8.1-8.12
• /
• 2024

Objectives: The purpose of this study was to evaluate the effect of Dental Practicality Index (DPI) training using an online video on the treatment planning decisions and confidence level of dental undergraduates (DUs). Materials and Methods: Ninety-four DUs were shown 15 clinical case scenarios and asked to decide on treatment plans based on 4 treatment options. The most appropriate treatment plan had been decided by a consensus panel of experienced dentists. DUs then underwent DPI training using an online video. In a post-DPI-training test, DUs were shown the same clinical case scenarios and asked to assign the best treatment option. After 6 weeks, DUs were retested to assess their knowledge retention. In all 3 tests, DUs completed the confidence level scale questionnaire. Data were analyzed using the related-samples Wilcoxon signed rank test and the independent-samples Mann-Whitney U test with the level of significance set at p < 0.05. Results: DPI training significantly improved the mean scores of the DUs from 7.53 in the pre-DPI-training test to 9.01 in the post-DPI-training test (p < 0.001). After 6 weeks, the mean scores decreased marginally to 8.87 in the retention test (p = 0.563). DPI training increased their confidence level from 5.68 pre-DPI training to 7.09 post-DPI training. Conclusions: Training DUs using DPI with an online video improved their decision-making and confidence level in treatment planning.

• 정보화정책
• /
• 제31권2호
• /
• pp.105-132
• /
• 2024

본 연구는 온라인 콘텐츠 구독 서비스 이용에 영향을 미치는 요인을 알아보기 위한 실증 연구이다. 온라인 콘텐츠 구독 서비스가 일상생활과 밀접한 다양한 분야로 확대되고 있는 상황에서 이용자의 어떠한 특성이 온라인 구독 서비스 이용에 영향을 미치는지 알아보고자 한다. 본 연구에서는 종속변수를 현재 구독하고 있는 온라인 콘텐츠 구독 서비스 개수로 설정하였고, 독립변수를 과시적 제품 구매 성향, 성격 유형, 온라인 콘텐츠 이용 경험 여부, 디지털 리터러시로 설정하였다. 또한, 통제변수로는 인구사회학적 특성(성별, 연령, 최종학력, 개인 월평균 소득, 가구원 수)과 디지털 기기(휴대폰, 태블릿, 데스크탑, 노트북, TV) 보유여부를 설정하였다. 본 연구에서는 정보통신정책연구원(KISDI)의 2022년 한국미디어패널조사 데이터를 활용하여 토빗(Tobit) 회귀분석을 실시하였다. 연구결과, 디지털 리터러시, 성격유형 중 조화성과 친화성, 온라인 콘텐츠 이용 경험은 온라인 콘텐츠 구독 서비스 이용에 유의미한 영향을 미치는 것으로 나타났다. 그러나 이용자의 과시적 제품 구매 성향과 성격유형 중 개방성과 외향성은 온라인 콘텐츠 구독 서비스 이용에 유의미한 영향을 미치지 않았다. 구체적으로 온라인 뉴스/잡지/E-book, 음악, 교육동영상 콘텐츠의 이용 경험과 디지털 리터러시는 온라인 구독 서비스 이용에 긍정적인 영향을 미치는 것으로 나타났으며, 온라인 게임 콘텐츠 이용 경험과 성격유형 중 친화성과 조화성은 부정적인 영향을 미치는 것으로 나타났다.

• Clinical Nutrition Research
• /
• 제12권2호
• /
• pp.138-153
• /
• 2023

The prevalence of metabolic syndrome (MetS) and its cost are increasing due to lifestyle changes and aging. This study aimed to develop a deep neural network model for prediction and classification of MetS according to nutrient intake and other MetS-related factors. This study included 17,848 individuals aged 40-69 years from the Korea National Health and Nutrition Examination Survey (2013-2018). We set MetS (3-5 risk factors present) as the dependent variable and 52 MetS-related factors and nutrient intake variables as independent variables in a regression analysis. The analysis compared and analyzed model accuracy, precision and recall by conventional logistic regression, machine learning-based logistic regression and deep learning. The accuracy of train data was 81.2089, and the accuracy of test data was 81.1485 in a MetS classification and prediction model developed in this study. These accuracies were higher than those obtained by conventional logistic regression or machine learning-based logistic regression. Precision, recall, and F1-score also showed the high accuracy in the deep learning model. Blood alanine aminotransferase (β = 12.2035) level showed the highest regression coefficient followed by blood aspartate aminotransferase (β = 11.771) level, waist circumference (β = 10.8555), body mass index (β = 10.3842), and blood glycated hemoglobin (β = 10.1802) level. Fats (cholesterol [β = -2.0545] and saturated fatty acid [β = -2.0483]) showed high regression coefficients among nutrient intakes. The deep learning model for classification and prediction on MetS showed a higher accuracy than conventional logistic regression or machine learning-based logistic regression.

• 아태비즈니스연구
• /
• 제14권4호
• /
• pp.233-254
• /
• 2023

Purpose - This study aims to verify whether the effect of tax avoidance on corporate value is non-linear in the Korean financial markets. Design/methodology/approach - This study believes that the cause of the inconsistent empirical analysis results of previous studies that verified the relationship between tax avoidance and firm value may be an error in assuming linearity, and verifies whether a nonlinear relationship exists. The sample company in this study is a December settlement corporation listed on the Korean stock market, and the analysis period is from 2000 to 2021. In the empirical analysis model, Tobin's Q is used as a proxy for corporate value, tax avoidance is used as the main independent variable, and a regression model is designed with corporate size, growth rate, and debt ratio set as control variables. Findings - As a result of the empirical analysis, it can be confirmed that there is an inverted U-shaped nonlinear relationship between tax avoidance and corporate value. In the additional analysis using Ohlson (1995) firm valuation model for the robustness of the results of the empirical analysis, the same nonlinear value relationship between tax avoidance can be confirmed. Research implications or Originality - This study is considered to be meaningful in that it verifies the non-linear relationship of tax avoidance, which has not been attempted in previous studies. The meaning of the inverted U-shaped nonlinear relationship presented in this study is that corporate tax avoidance acts as a factor that increases corporate value up to a certain level, but rather becomes a factor that decreases corporate value when it exceeds a critical point. These results are expected to provide new perspectives and perspectives on tax avoidance to companies belonging to the Korean capital market.

• Current Optics and Photonics
• /
• 제8권4호
• /
• pp.406-415
• /
• 2024

The major error factors that degrade the efficiency of coherent beam combining (CBC) are numerically studied in a comprehensive manner, paying particular attention to phase, tip-tilt, polarization angle, and beam quality. The power in the bucket (PIB), normalized to the zero-error PIB, is used as a figure of merit to quantify the effect of each error factor. To maintain a normalized PIB greater than or equal to 95% in a 3-channel CBC configuration, the errors in phase, tip-tilt, and polarization angle should be less than 1.06 radians, 1.25 ㎛, and 1.06 radians respectively, when each of the three parameters is calculated independently with the other two set to zero. In a worst-case scenario of the composite errors within the parameter range for the independent-95%-normalized-PIB condition, the aggregate effect would reduce the normalized PIB to 83.8%. It is noteworthy that the PIB performances of a CBC system, depending on phase and polarization-angle errors, share the same characteristic feature. A statistical approach for each error factor is also introduced, to assess a CBC system with an extended number of channels. The impact of the laser's beam-quality factor M² on the combining efficiency is also analyzed, based on a super-Gaussian beam. When M² increases from 1 to 1.3, the normalized PIB is reduced by 2.6%, 11.8%, 12.8%, and 13.2% for a single-channel configuration and 3-, 7-, and 19-channel CBC configurations respectively. This comprehensive numerical study is expected to pave the way for advances in the evaluation and design of multichannel CBC systems and other related applications.