• Bulletin of the Korean Chemical Society
• /
• v.3 no.3
• /
• pp.122-129
• /
• 1982

In order to extend our understanding on the multiple inhibition enzyme kinetics, a general equation of an enzyme reaction in the presence of two different reversible inhibitors was derived by what we call "match-box mechanism" under the combined assumption of steady-state and quasi-equilibrium for inhibitor binding. Graphical methods were proposed to analyze the multiple inhibition of an enzyme by any given sets of different inhibitors, i.e., competitive, noncompetitive, and uncompetitive inhibitors. This method not only gives an interaction factor $({\alpha})$ between two inhibitors, but also discerns ${\alpha}_1$ and ${\alpha}_2$ with and without substrate binding, respectively. The factors involved in the dissociation constants of inhibitors can also be evaluated by the present plot. It is also shown that the present kinetic approach can be extended to other forms of activators or hydrogen ions with some modification.

• Publications of The Korean Astronomical Society
• /
• v.25 no.3
• /
• pp.91-99
• /
• 2010

An increasing number of observations have confirmed the presence of multiple stellar populations in Galactic globular clusters. Multiple populations evidence come from the complex chemical pattern of stars hosted in GCs and from the split or broadening of different evolutionary sequences in the color-magnitude diagrams. Multiple stellar populations have been identified in Galactic and Magellanic Cloud clusters, as well as in external galaxies. In this paper I will summarize the observational facts.

• Educational Technology International
• /
• v.11 no.1
• /
• pp.119-143
• /
• 2010

This study was conducted to find out the relationship between teaching presence and self-directed learning readiness in e-learning environment. 219 cyber university students finished the web-formatted questionnaires. The Self-Directed Learning Readiness Scale-Adult Based Education instrument and Teaching Presence Scale instrument were used. The results of the present study can be concluded as follow. First of all, teaching presence and self-directed learning readiness have a very high relationship in e-learning environment. Secondly, all five components of teaching presence have significant correlations with self-directed learning readiness. Thirdly, depending on the results of multiple regression analysis, only components of instructional contents and facilitating communication predict the self-directed learning readiness.

• Journal of Convergence for Information Technology
• /
• v.11 no.6
• /
• pp.154-161
• /
• 2021

This study analyzed the characteristics of the presence of multiple chronic diseases (MCDs) in older adults who transferred from long-term care hospitals (LTCHs) to emergency departments (EDs). According to the data from the national emergency department information system from January 1, to December 31, 2019, the number of older adults transferred from LTCHs to the ED due to chronic diseases was 13,608. Among those who MCDs, 79.9% were over 75 years old, and 74.0% were hospitalized for MCDs. The length of stay in the ED differed according to the presence of MCDs (P<0.001). As for the prevalence of MCDs, the odds ratio (OR) of the ED and in the hospitalized patients was high in Gwangju (OR 8.899 vs. 8.142) and Jeonbuk (OR 13.865 vs. 10.676). As described above, the characteristics of patients regarding the presence of MCDs varied according to age and region.

• Journal of Christian Education in Korea
• /
• v.74
• /
• pp.255-271
• /
• 2023

Purpose of study: The purpose of this study is to explore the moderating effect of learning motivation in the effect of cognitive presence on cognitive regulation. Research content and method: The subjects of this study were 160 preservice teachers who are enrolled in the Faculty of Education of a university. The survey measured cognitive control, human presence, and learning motivation. Among the collected data, learning motivation was averaged. In addition, a group with low learning motivation and a group with high motivation were distinguished. Next, this study compared the averages of cognitive control by classifying the learning motivation levels. The collected data was analyzed using a multiple regression (Stepwise) method to explore the effect of cognitive presence on cognitive control. First, multiple regression analysis was performed on the entire group. Second, multiple regression analysis was performed by dividing the group with low learning motivation from the group with high motivation. Conclusions and Suggestions: As a result of the analysis, the group with high learning motivation showed a higher level of cognitive control than the group with low motivation. In the group with high learning motivation, only content understanding among the sub-factors of cognitive presence had an effect on cognitive control. In the group with low learning motivation, all factors of cognitive presence were affected.

• Journal of Korea Entertainment Industry Association
• /
• v.14 no.7
• /
• pp.79-94
• /
• 2020

The purpose of this study is to analyze the difference in the effect of presence for the activation of virtual reality sports on participation satisfaction, to suggest continuous screen golf exercise participation, and to provide empirical and academic data for the development of the entire virtual reality sports market. To achieve this purpose, the survey period was from March 13 to May 13, 2020, with five researchers and assistants. The purpose of this study and the questionnaire were fully explained to consumers who experienced screen golf directly, and 247 questionnaires were used as the final valid sample by making a questionnaire with self-administration method. The data processing method was the statistical program Windows SPSS 18.0. First, factor analysis and reliability analysis, second, frequency analysis mean(M) and standard deviation(SD), third, Scheffe analysis among t-test and One-way ANOVA analysis, fourth, correlation analysis between variables and multiple regression analysis were conducted. The results of this study through these methods and procedures are as follows. First, there was a significant difference in participation satisfaction of presence in gender, and participation period of general characteristics. Second, there was a high difference in social presence, social self-reliance, and Ego, which are sub-factors of Presence, in social satisfaction, psychological satisfaction, and physical satisfaction. Third, the sub-factors of Presence, Social Presence, Social Self-Reliance, and Ego, were found to have a high effect on the sub-factors of Participation Satisfaction, Social Satisfaction, and Psychological Satisfaction.

• Journal of Industrial Convergence
• /
• v.21 no.11
• /
• pp.75-83
• /
• 2023

This study aimed to identify the effect of academic emotions, learning flow and perceived teaching presence for academic achievement of nursing students in an uncontacted online class learning in the convergence society. The participants were 127 nursing students; data were analyzed using t-test, ANOVA, pearson correlation, multiple regression. It was found that: nursing students showed higher score at academic emotions, higher learning flow, and higher perceived teaching presence, higher score for academic achievement. The main factors influencing academic achievement were academic emotions, learning flow and perceived teaching presence. They explained about 42.7% of the academic achievement. Therefore, when operating uncontacted online classes for nursing students, it is necessary to consider the factors of learners, the personal efforts of the instructor, and systematic support for strengthening the instructor's capabilities.

• Korean Journal of Clinical Laboratory Science
• /
• v.40 no.2
• /
• pp.135-141
• /
• 2008

Benign paroxysmal positional vertigo (BPPV) is one of the most common clinical entities encountered in a dizziness clinic. Treatment of this disease, canalith repositioning procedures, have been reported to be successful in 44-90%. Treatment requires only one treatment visit in most patients. However, there are significant numbers of patients who require multiple treatment visits for relief. The goal of this study is to identify variables that may be associated with these difficult to treat cases. Retrospective review was performed for the patients diagnosed as BPPV at St. Carollo dizziness center. Variables for statistical analysis included age, sex, involved canal, presence of bilateral disease, presence of recent head trauma, presence of chronic otitis media, history of middle ear surgery, history of otologic surgery, unilateral vestibular loss, underlying disease such as hypertension or diabetes, change of involved canal during treatment course and number of treatment visits. Two hundred patients with BPPV who received treatment were identified from JAN. 2006 to JUN. 2007. 87% required one treatment visit, 5% required second treatment visit, and 95% were successfully treated after three treatment visits. Variables such as bilateral disease, post-traumatic BPPV, duration of symptom before treatment and change of involved canal during treatment were significantly related with number of treatments. Patient's with bilateral BPPV or with recent head trauma or longer duration of symptom are more likely to require multiple visits for canalith repositioning.

• Health Policy and Management
• /
• v.7 no.2
• /
• pp.1-18
• /
• 1997

This study was conducted to analyze patient days and medical care benefits of finger-amputated patients due to industrial accident. The 161 personal data on medical care for finger-amputated patients due to industrial accident(88 in 1994, 73 in 1995) of Regional Labor Office and hospital characteristics were analyzed. The major results of this study were as follows : According to stepwise multiple regression analysis of patient days, number of amputated finger, location of hospital, bed capacity of hospital, presence of plastic surgery in hospital, number of orthopedic specialist per 100 beds, sick leave benefits per day were the major significant variables in order. In stepwise multiple regression analysis with medical care benefits as a dependent variable, presence of plastic surgery in hospital, number of orthopedic specialist per 100 beds, number of amputated finger, sick leave benefits per day, age, bed capacity of hospital were the major significant variables in order. The minimum optimal size with the lowest medical care benefits was a hospital with 300 beds. This shows that the economy of scale is also applicable for hospital industry. In summary, presence of plastic surgery in hospital, number of orthopedic specialist per 100 beds, number of amputated finger, sick leave benefits per day, bed capacity of hospital were the major significant variables in both patient days and medical care benefits.

• Journal of the Korean Institute of Telematics and Electronics S
• /
• v.34S no.1
• /
• pp.9-15
• /
• 1997

In this paper, the performance of a hybrid direct-sequence/slow-frequency-hoped (DS/SFH) spread-spectrum (SS) system with noncoherent DPSK modulation is considered. Th ebit error probability is derived ovef a rayleigh fading channel in the presence of multiple tone jamming. Numerical evaluations are presented for some combinations of system parameters. The performance of a hybrid DS/SFH SS system is shown to be inferior to that of a pure DS SS system at low jamming-to-signal power ratio (JSR). At high JSR, the performance of a pure DS SS system is shown to be the same as the worst case peformance of a hybrid DS/SFH SS system.