• Title/Summary/Keyword: statistical data analysis

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Effect of dietary protein levels and age on growth performance, total excreta and nitrogen balance of laying hens during the growing phase

  • Jeseok Lee;Myunghwan Yu;Elijah Ogola Oketch;Shan Randima Nawarathne;Yu Bin Kim;Nuwan Chamara Chathuranga;Venuste Maniraguha;Bernadette Gerpacio Sta. Cruz;Eunsoo Seo;Haeeun Park;Hyunji Choi;Dong Jo Yu;Jung-Kon Kim;Jung Min Heo
    • Korean Journal of Agricultural Science
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    • v.51 no.2
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    • pp.193-203
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    • 2024
  • This study examined the effect of a dietary protein level and age on growth performance, total excreta, and nitrogen balance in laying hen during the growing period for 18 weeks. A total of 96 Hy-Line Brown laying hens were divided into two treatments according to the experimental diets, with each group consisting of six replicates. The experimental diets included: 1) an adequate metabolizable energy and crude protein diet formulated to meet the age and breed specification for Hy-Line Brown containing 21, 18, 16, and 14% dietary CP during 0 to 6, 6 to 12, 12 to 15, 15 to 18 weeks, respectively (CON); 2) 2% CP deficiency from CON diet containing 19, 16, 14, 12% dietary CP during 0 to 6, 6 to 12, 12 to 15, 15 to 18 weeks, respectively (LP). Growth performance, total excreta, and nitrogen balance were investigated for 18 weeks every 3 weeks, and two-way ANOVA was used for statistical analysis of data. The LP group had lower total excreta and N intake than CON group in the whole period of the experiment (p < 0.001). Moreover, birds in the LP group showed lower N excretion than the CON group (p < 0.05). However, the CON group exhibited higher BW, ADG than the LP group (p < 0.001). Application of low-protein diet to laying hens during the growing period reduced N excretion, which contribute to the sustainable development of the laying hen industry by minimizing environmental pollution.

College Students' Writing Self-Efficacy in Reflective Writing Classes Utilizing ChatGPT (ChatGPT를 활용한 성찰적 글쓰기 수업에서 대학생의 쓰기 효능감 고찰)

  • Jeon-Gu Kang;Si-Yeon Pyo
    • Journal of Practical Engineering Education
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    • v.16 no.4
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    • pp.471-479
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    • 2024
  • This study aims to examine the cognitive and affective changes in university students' writing self-efficacy when engaging in reflective writing classes utilizing ChatGPT. Over ten sessions, reflective writing classes using ChatGPT were conducted for students enrolled in a mandatory writing course at S University in Gyeonggi Province. The reflective journals written by the students during these sessions were meticulously reviewed as qualitative data with statistical analysis of pre- and post-surveys on writing self-efficacy. The results confirmed that utilizing ChatGPT in reflective writing classes positively impacted students' writing self-efficacy. Participants showed increased interest and confidence in their writing abilities when using ChatGPT. It was reported that they received cognitive assistance in outlining and paragraph structuring from samples generated by ChatGPT. Although survey results showed an overall increase in writing self-efficacy, the only statistically significant change was in the 'plagiarism response' category, which means a clear awareness of plagiarism issues. The process of personalizing the ChatGPT-generated samples requires consistent practice, and systematic guidelines on using such helpful tool effectively should be reinforced as a future task.

Statistical Analysis of Soil and Geological Environment Characteristics in Slow-moving Landslide Prone Areas in the Republic of Korea (땅밀림 우려지의 토양 및 지질환경 특성에 관한 통계적 분석)

  • Daeseong Yang;Sangjun Im;Jung Il Seo;Taeho Bong;Dongyeob Kim
    • Journal of Korean Society of Forest Science
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    • v.113 no.3
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    • pp.382-392
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    • 2024
  • This study aimed to identify differences in soil properties and geological characteristics between slow-moving landslide prone areas and areas without landslide (control areas) in the Republic of Korea. During this 3-year field surveys (2019-2021), 11 soil and geological parameters were measured at 300 sites, i.e., 107 slow-moving landslide prone areas and 193 control areas. T-tests were conducted to identify differences in field-observed parameters between the two areas, followed by χ2-tests and density plots considering distribution patterns of the sample groups. We identified statistically significant differences between the areas in terms of soil internal friction angle, weathered rock thickness, bedrock thickness, and number of major geological anomaly zones. In conclusion, slow-moving landslide prone areas exhibited significant differences in geological characteristics, such as stratum thickness and presence of anomaly zones, compared with the control areas. To better understand the relationship between the geological characteristics identified in this study and the occurrence of slow-moving landslides, further field data collection and systematic analyses are warranted.

The Effect of Self-control, Time management behavior, SNS addiction proneness on academic procrastination in college students (대학생의 자기통제, 시간관리행동과 SNS 중독 경향성이 학업지연행동에 미치는 영향)

  • Jeongeun Yu;Hyunsu Ko;Euigyu Sin;Junghee Park
    • The Journal of the Convergence on Culture Technology
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    • v.10 no.5
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    • pp.819-826
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    • 2024
  • This study aims to examine the correlations between self-control, time management behavior, and SNS addiction proneness among university students, and to analyze their impact on academic procrastination. The goal is to explore intervention strategies to improve academic procrastination behaviors. The subjects of this study were 167 students from a university located in City D, who agreed to participate and responded to the survey between February 6, 2024, and April 19, 2024. The collected data were analyzed using the SPSS 21.0 statistical program, employing t-test, ANOVA, Pearson's correlation coefficient, and multiple regression analysis. Academic procrastination showed significant negative correlations with self-control (r=-.570, p<.001) and time management behavior (r=-.544, p<.001), and a significant positive correlation with SNS addiction proneness (r=.367, p<.001). The factors influencing academic procrastination were time management behavior (β=-.461, p<.001), self-control (β=-.359, p<.001), and SNS addiction proneness (β=.199, p<.001), with an explanatory power of 52%. To reduce academic procrastination among university students, it is necessary to implement various extracurricular programs aimed at improving time management behavior.

Effect of Different Intensity in Exercise on Blood Lipids, Albumin and FFA in Postmenopausal Middle-aged Obese Women (운동 강도 차이에 따른 폐경 후 비만 중년 여성의 혈중지질, 알부민 및 FFA에 미치는 영향)

  • Dong-Gi Lee;Tae-Kyu Kim;Su-Han Koh;Min-Kyo Kim;Do-Yeon Kim
    • Journal of the Korean Applied Science and Technology
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    • v.41 no.4
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    • pp.929-938
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    • 2024
  • This study examined the effects of a 12-week combined exercise program on blood lipids, albumin, and free fatty acid (FFA) levels in obese, middle-aged women, aged 55-64, who were within five years post-menopause. The participants were divided into two groups: a moderate-intensity exercise group (MIG, n=10) and a high-intensity exercise group (HIG, n=10). Both groups performed resistance exercises using elastic bands and aerobic walking on treadmills three times a week for 60 minutes per session. Data analysis involved calculating the mean (M) and standard deviation (SD) for each measurement item. A two-way repeated measures ANOVA was used to assess interaction effects between groups and periods. Paired t-tests were conducted to evaluate within-group differences over time, and independent t-tests were used to compare between-group differences. The statistical significance level was set at .05 for all analyses. Results showed a significant interaction effect for triglycerides (TG) among the blood lipids (p<.05). No statistically significant difference was found in albumin levels. FFA levels significantly decreased in both groups due to the interaction effect (p<.05), with a more pronounced decrease in the MIG group. These findings indicate that regular exercise is effective in improving and preventing obesity in post-menopausal, obese middle-aged women. Notably, moderate-intensity exercise had a more substantial impact on TG and FFA levels compared to high-intensity exercise. Therefore, continuous moderate-intensity exercise is recommended to improve obesity and promote a healthy lifestyle before transitioning into old age.

A Study on Improving the Acceptability of Security Policies among Organizational Members: Based on the Health Belief Model (조직구성원의 보안정책 수용성 향상에 관한 연구: 건강신념모델을 바탕으로)

  • Boyoung Kim;Woojong Suh
    • Journal of Korea Society of Industrial Information Systems
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    • v.29 no.5
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    • pp.69-94
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    • 2024
  • In order to improve the security policy compliance performance of an organization, it is crucial for organizational members to have a strong intention to actively accept these policies. Accordingly, this study proposes a research model based on the Health Belief Model, a key theory in the field of health psychology, with the aim of seeking ways to enhance the acceptability of security policies among organizational members. Data were collected through surveys and analyzed using statistical methods. The results of the study revealed that the perceived security threats and the perception of support for security policy compliance at the organizational level significantly influence the acceptance of security policies through the mediating role of perceived benefits from security policy compliance. Additionally, the study demonstrated that the perceived burden of effort and work disruption associated with complying with security policies, i.e., perceived barriers, has a significant negative impact on the acceptance of security policies. This study holds academic significance as it presents a model that effectively analyzes the cognitive mechanisms influencing the acceptance of security policies by applying the Health Belief Model, originally rooted in healthcare. The analysis results and various implications discussed in this study are expected to provide useful information and insights for developing strategies to enhance the acceptance of security policies among organizational members in the future.

The Impact of FinTech Diffusion on Firm Performance: the Case of China (핀테크 확산이 기업의 성과에 미치는 영향: 중국 사례를 중심으로)

  • Jungeun Lee;Dawoon Jung
    • Journal of Korea Society of Industrial Information Systems
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    • v.29 no.5
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    • pp.113-124
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    • 2024
  • FinTech has been credited with generating positive economic outcomes by improving access to financial services through technological innovations. This study examines how FinTech diffusion impacts firm performance using the case of China-one of the world's fastest-growing FinTech markets. Moreover, given China's unique economic landscape-characterized by disparities between the eastern regions and the rest of the country, largely due to early policy decisions that prioritized efficient growth during the Reform and Opening-up period-regional variables (eastern vs. central-western) are incorporated into the model. A random effects model analysis was conducted using panel data collected over six years from listed companies in China. The hypothesis that the level of FinTech diffusion would have a positive impact on firm performance was not supported at the 5% significance level. However, statistical evidence was found for the moderating effect of regional disparities. Specifically, in regions with lower levels of economic development and underdeveloped financial infrastructure-where access to traditional financial services is constrained-the positive impact of FinTech diffusion was more pronounced. These findings suggest that while the economic benefits of FinTech diffusion may not uniformly enhance corporate performance, they can vary depending on contextual factors such as regional disparities.

Application of Support Vector Regression for Improving the Performance of the Emotion Prediction Model (감정예측모형의 성과개선을 위한 Support Vector Regression 응용)

  • Kim, Seongjin;Ryoo, Eunchung;Jung, Min Kyu;Kim, Jae Kyeong;Ahn, Hyunchul
    • Journal of Intelligence and Information Systems
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    • v.18 no.3
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    • pp.185-202
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    • 2012
  • .Since the value of information has been realized in the information society, the usage and collection of information has become important. A facial expression that contains thousands of information as an artistic painting can be described in thousands of words. Followed by the idea, there has recently been a number of attempts to provide customers and companies with an intelligent service, which enables the perception of human emotions through one's facial expressions. For example, MIT Media Lab, the leading organization in this research area, has developed the human emotion prediction model, and has applied their studies to the commercial business. In the academic area, a number of the conventional methods such as Multiple Regression Analysis (MRA) or Artificial Neural Networks (ANN) have been applied to predict human emotion in prior studies. However, MRA is generally criticized because of its low prediction accuracy. This is inevitable since MRA can only explain the linear relationship between the dependent variables and the independent variable. To mitigate the limitations of MRA, some studies like Jung and Kim (2012) have used ANN as the alternative, and they reported that ANN generated more accurate prediction than the statistical methods like MRA. However, it has also been criticized due to over fitting and the difficulty of the network design (e.g. setting the number of the layers and the number of the nodes in the hidden layers). Under this background, we propose a novel model using Support Vector Regression (SVR) in order to increase the prediction accuracy. SVR is an extensive version of Support Vector Machine (SVM) designated to solve the regression problems. The model produced by SVR only depends on a subset of the training data, because the cost function for building the model ignores any training data that is close (within a threshold ${\varepsilon}$) to the model prediction. Using SVR, we tried to build a model that can measure the level of arousal and valence from the facial features. To validate the usefulness of the proposed model, we collected the data of facial reactions when providing appropriate visual stimulating contents, and extracted the features from the data. Next, the steps of the preprocessing were taken to choose statistically significant variables. In total, 297 cases were used for the experiment. As the comparative models, we also applied MRA and ANN to the same data set. For SVR, we adopted '${\varepsilon}$-insensitive loss function', and 'grid search' technique to find the optimal values of the parameters like C, d, ${\sigma}^2$, and ${\varepsilon}$. In the case of ANN, we adopted a standard three-layer backpropagation network, which has a single hidden layer. The learning rate and momentum rate of ANN were set to 10%, and we used sigmoid function as the transfer function of hidden and output nodes. We performed the experiments repeatedly by varying the number of nodes in the hidden layer to n/2, n, 3n/2, and 2n, where n is the number of the input variables. The stopping condition for ANN was set to 50,000 learning events. And, we used MAE (Mean Absolute Error) as the measure for performance comparison. From the experiment, we found that SVR achieved the highest prediction accuracy for the hold-out data set compared to MRA and ANN. Regardless of the target variables (the level of arousal, or the level of positive / negative valence), SVR showed the best performance for the hold-out data set. ANN also outperformed MRA, however, it showed the considerably lower prediction accuracy than SVR for both target variables. The findings of our research are expected to be useful to the researchers or practitioners who are willing to build the models for recognizing human emotions.

Radiation Exposure of Hands and Feet from $^{18}F$-FDG in Radio-technologists (방사선 작업 종사자의 작업화 및 작업복의 방사선 오염 분석)

  • Lee, Seung-Jae;Jeong, Seok;Seo, Soo-Hyun;Park, Yong-Sung;Park, Hoon-Hee;Oh, Shin-Hyun;Lim, Han-Sang;Kim, Jae-Sam;Lee, Chang-Ho
    • The Korean Journal of Nuclear Medicine Technology
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    • v.15 no.2
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    • pp.94-98
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    • 2011
  • Purpose: The radiation exposure from radioisotope at the hands and foots of radiation workers who works in PET/CT part at the department of nuclear medicine was investigated in this study. Materials and Methods: From 4th August 2010 to 14th January 2011, 6 radio-technologists' radiation on hands and feet were measured. All radio-technologist have been examined around 8; morning, 12; afternoon, and 16 o'clock; evening, respectively. SPSS version 17 was used for statistical analysis. Results: The statistical significances were calculated in several ways. The radiation from both hands and feet in the Morning was lower than Afternoon and Evening. In some cases, the detected radiation showed extremely high values in data. In order to find the effect of the ${\gamma}$-ray on the hand, the estimated doses were presumably calculated, however, the exposure dose on feet were unmeasured. Conclusion: Even if the radiation exposure from the radioisotope at the hands and feet were under the limitations, it is definitely needs to prevent the radiation-contamination. Therefore, the radio-technologists need to have a proper radiation-dealing-procedure of their own, and must try to prevent a radiation exposure by themselves.

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Shear bond strength and debonding failure mode of ceramic brackets according to the surface treatment of porcelain (도재 표면 처리가 따른 세라믹 브라켓의 전단 접착 강도 및 탈락 양상)

  • Lee, Jeong-Nam;Lee, Cheol-Won
    • The korean journal of orthodontics
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    • v.28 no.5 s.70
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    • pp.803-812
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    • 1998
  • The purpose of this study was to evaluate the shear bond strength and failure mode of ceramic brackets according to the surface treatment of porcelain. Sixty Porcelain samples were randomly divided into six groups of ten samples. Then they were treated as follows: Group 1(silane only), Group 2(etching+silane), Group 3(stone+silane), Group 4(sandblasting+silane), Group 5(stone +etching+silane), Group 6(sandblasting+etching+silane) After surface treatment of porcelain, sixty Transcend 6000 brackets were bonded to the prepared porcelain surface and they were stored in $37^{\circ}C$ saline for 24 hours. An Instron universal testing machine was used to test the shear bond strength of ceramic brackets to porcelain. After debonding, bases of ceramic brackets and porcelain surfaces were examined under scanning electron microscope(SEM) to determine failure mode. Statistical analysis of the data was carried out with one-way ANOVA and Duncan's multiple range test. The results were as follows : 1. The shear bond strength of surface-treated groups 2 to 6 was higher than that of only silane-treated group 1, and there was statistical significance. (P<0.05) 2. There was no significant difference among the groups 3 to 6. (P>0.05) 3. The shear bond strength of etching-surface treated group 2 was significantly lower than those of sandblasting-surface treated group 4, complex surface treated group 5 and group 6. 4. According to the scanning electromicroscopic images, the surface roughness of sandblasting-surface treated group 4 was less than those of the group 5 and 6, but there was no significant difference in the shear bond strength. (P>0.05) As a conclusion we can have a clinically adequate bond strength when an application of silane is done after the treatment of porcelain surface with more than one way to bond ceramic bracket on the porcelain. Also, it is considered that the sandblasting and application of silane is effective for the simplication and convenience of the treatment.

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