• Journal of Dental Rehabilitation and Applied Science
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• v.31 no.1
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• pp.10-19
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• 2015

Purpose: The aim of the present study was to evaluate the long-term survival of implants retrospectively and determine the risk factors associated with implant failure. Materials and Methods: Of all implants that were placed at the Department of Periodontology of the Dental Hospital of Gangneung-Wonju National University from January 1998 to December 2012, 2265 implants that were followed up until June 2013 were included in this study. Data were collected from clinical and radiographic examinations from previous visits. The information gathered included gender, age, smoking status, implant diameter, implant length, surface of implant, location of implant within the dental arch, surgical techniques and existence of complications. Results: The survival rate before loading was 98.9%. The cumulative survival rate after 5 years of loading was 97.2%, and after 15 years of loading was 95.2%. In a simple logistic regression analysis, gender (P = 0.016), smoking status (P = 0.001), location of implant (P = 0.020) and existence of complications (P = 0.002) were statistically associated with implant failure and included in the multiple regression analysis. As a result of multiple logistic regression analysis, the variables statistically associated with implant failure (P < 0.05) were smoking status (P = 0.049) and existence of complications (P < 0.001). Conclusion: The cumulative survival rate of dental implants after 15 years of loading was 95.2% and that the variables statistically associated with implant failure were smoking status and existence of complications.

• Survey Research
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• v.7 no.2
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• pp.1-38
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• 2006

This study was conducted to develop a happiness index for Korean. 16 factors of happiness derived from both exploratory and confirmatory factor analysis based on a nationwide sample of 1503 Korean adults were reclassified into 3 components of Alderfer's need theory. The LISREL was used to measure the weight of each happiness factor. The results showed that happiness index was functioned by a formula(Happiness=2.5*existence+2.5*relationship+5*growth). Applying this formula, the average happiness score for Korean was 57.71. It was also demonstrated that the degree of happiness differed according to individual's gender, region, and income. Men was happier than women, while there was no significant difference among ages. As far as the region concerned, those who live in Seoul and Daejeon were happier than the others. People who earn over 2,500,000 won per month were happier than the others in terms of economic status. Finally, the result of the discriminant function analysis revealed that individual or psychological growth factor was more important than existence and relationship factors. Based on these significant research findings, practical implications and future research directions were discussed.

• Journal of the Korea Convergence Society
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• v.12 no.4
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• pp.285-291
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• 2021

This study is a retrospective study attempted to determine the factors that influence the survival of patients with traumatic acute subdural hematoma. The study subjects were 207 patients with traumatic subdural hematoma who visited the emergency room from January 2017 to February 2019 at C University Hospital in G Metropolitan City. Data analysis was using the SPSS 23.0 program, and χ2-test, t-test, and logistic regression analysis. As a result of the study, the factors affecting the survival of the subjects were under disease, complications, and initial GCS. Therefore, it is necessary to establish a medical system to check the subject's history and to train medical staff to prevent complications. In addition, it is necessary to improve the transfer system so that the GCS of the subject can be measured from the stage before transfer to a medical institution and transferred to a hospital that can be treated quickly.

• Journal of Digital Convergence
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• v.19 no.3
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• pp.109-114
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• 2021

This study is to verify the mediating effect of self-efficacy in the relationship between elements of the ERG and organizational attachment. To verify this, a survey was conducted on employees working at companies in Korea and the research found that all three elements of ERG have a significant effect on self-efficacy, and self-efficacy also have a significant effect on organizational attachment. Thus, it was found that self-efficacy played a mediating role in the relationship between the three elements of ERG and organizational attachment. Based on these findings, we present practical implications while also presenting future research directions.

• 한국수산학회:학술대회논문집
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• 2005.05a
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• pp.107-109
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• 2005

• 한국여성벤처협회:학술대회논문집
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• v.2005 no.04
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• pp.121-129
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• 2005

• The Korean Journal of Malacology
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• v.16 no.1_2
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• pp.25-29
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• 2000

In order to investigate the optimal environment factor for growth of the cockle shell, Anadara granosa bisenensis, tolerance experiment to the water temperature and salinity have been conducted. In the tolerance experiment to the temperature A. granosa bisenensis survived a very wide range from 3$^{\circ}C$ to 33$^{\circ}C$, but their survival rate was lower at higher water temperature up to 35$^{\circ}C$. In the case of salinity their tolerance range was from 0$\textperthousand$ to 100$\textperthousand$ and showed higher survival rate at lower salinity. Growth in shell length and total weight of the spat at the end of the rearing experiment was 13.17${\pm}$0.98 mm and 0.69${\pm}$011 g.

• Journal of Dental Rehabilitation and Applied Science
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• v.26 no.1
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• pp.59-68
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• 2010

Recently, dental implants extensively inserted on edentulous area show highly clinical success rate. However, clinicians cannot exclude the possibility of failure and it often unexpectively occures. Many possible factors associated with failure of dental implants have been reported but controversy exists over the extent to them. In this study, we collected 212 patients who had been inserted 358 dental implants on mandibular premolar and molar area from 2005 to 2006. The survival rate of fixtures was recorded according to age of patients, implantation site, implant system, diameter and length of fixtures. Multi-variable analysis using SPSS chi-square test was operated to verify relation of each factors and survival rates. Accumulative survival rate was 98.3% for 3 years. Only diameter of fixtures was related to the implant survival rate. This may be thought that wider fixtures had been chosen to rescue implants or used in sites of poor bone quality. Further continuous study will be needed for direct guidance associated with survival rate of implants.

• The Journal of Korean Academy of Prosthodontics
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• v.47 no.4
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• pp.457-462
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• 2009

Purpose: The objective of this systematic review was to obtain the comprehensive survival rates of short implants. Then it was examined that whether treatment using short implants has favorable results. Methods: A MEDLINE search was performed, the data obtained from many articles about length, diameter, site of placement, surface treatment and prosthetic design were analyzed. Results and discussion: The data obtained from many articles were analyzed, and it was found that the survival rate of short implants was 95.87%, short implants has similar outcomes to those reported for standard implants. On the other hand, in the comparison the survival rate of 3 groups divided by the diameter of implants under 4 mm, 4-5 mm, and above 5 mm, a statistically significant difference was detected in under 4mm group. In implant group with 6-7 mm length, a group with 5-6 mm diameter has survival rate of 97.01%, groups with 3.1-4.8 mm diameter has survival rate of 92.96%, which was statistically significantly different. In the result of surface feature, the roughed surface groups of short implant showed a higher survival rate by approximately 6.3% than machined surface group. In the result of prosthetic design, survival rate of short implant was considerably lower for the single implant crown group (94.3%) than splinting group (99.4%).

• Korean Journal of Poultry Science
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• v.44 no.1
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• pp.59-65
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• 2017

This study examined factors affecting the analysis of motility of chicken semen. The viability of spermatozoa was estimated using varying dilution ratios and supplementation with BSA or fatty acid free (FAF)-BSA as protein sources in semen diluent. Fresh semen was examined after preparing dilutions in beltsvile poultry semen extender (BPSE) of 1/8, 1/16 and 1/32 at $25^{\circ}C$. The motility of incubated semen at each dilution was observed at 3 min (89.9%, 69.9% and 53.2%), 30 min (86.7%, 71.4% and 51.7%), 1 h (89.5%, 74.0% and 53.5%) and 3 h (78.5%, 66.5% and 45.7%), respectively. The addition of BSA or FAF-BSA to BPSE diluent significantly increased the viability of semen in 1/32 dilution with results of 53.2% (control), 84.8% (BSA) and 92.9% (FAF-BSA) (p<0.05). This phenomenon was also observed in the dilution of frozen semen, where FAF-BSA treatment increased the viability of thawed semen from 17.6% to 34.0% in a 1/8 dilution (p<0.05). When the protein sources were used in the dilution, the survival rates of diluted chicken semen were also increased with time lapse. These results show that FAF-BSA may act to protect chicken semen and is suitable as a basic component of chicken semen diluent for the method of analyzing rooster semen after freezing.