• The Korean Journal of Community Living Science
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• v.16 no.4
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• pp.159-174
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• 2005

This study examines adult perceptions of old age planning and the factors that explain the degree of their planning for the future. The data came from 478 adults between the age of 30 and 59 living in Gunpo city. Major findings can be summarized as follows. First, we find that participants are well aware of the need for old age planning, and that the majority of them think aey are responsible for their old age security. Nevertheless they are not preparing for later life very much. Second, they are doing their best planking for their later lives in the area of social activities. The degree of participants' preparation varies depending on their age and socioeconomic factors. Finally, participants who strongly recognize their parents' role are also more likely to plan for the future. These results suggest that the educational programs and systems for pre-instruction about various plans for old age be developed for even younger people.

• Restorative Dentistry and Endodontics
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• v.13 no.2
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• pp.253-263
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• 1988

In order to study the cleansing effect of air-driven sonic system, the author prepared root canals on 48 extracted human permanent single rooted teeth using hand instrumentation and aforementioned method, half and half of the cases. In order for comparison of the degree of remnant debris and cleanliness, the cross sections at 3mm and 7mm levels from the apex were stereomicroscopically observed and scored in accordance with predetermined degree. The obtained results were as follows: 1. Air-driven sonic system was more effective in cleansing root canal than hand instrumentation at apical 3mm level. (p < 0.01) 2. Air-driven sonic system was more effective in cleansing root canal than hand instrumentation at apical 7mm level. (p < 0.01) 3. In hand instrumentation, Helisonic file was more effective in cleansing root canal than Rispisonic file. (p < 0.05) In air-driven sonic system, on the other hand, there were no significant difference between the two files.

• Journal of Pharmaceutical Investigation
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• v.13 no.3
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• pp.100-103
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• 1983

Coprecipitates of sulpiride and polyethylene glycol (PEG) decrease the dissolution rate of sulpiride and the degree of decrease is reversely proportional to molecular size of PEG and proportional to increase of PEG ratios in coprecipitates. The physical mixtures of sulpiride and PEG increase the dissolution rate of sulpiride.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.299-300
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• 2003

본 연구자들은 이산화탄소($CO_2$)에 의한 셀룰로오스 카보네이트의 제조 및 재생 셀룰로오스 섬유 제조에 대한 몇몇 기초 연구성과를 발표한 바 있다[1, 2]. 이번 연구에서는 이산화탄소와의 반응을 통해 제조된 셀룰로오스 카보네이트 유도체의 치환도 변화에 따른 용해성을 평가하고 상그림표를 작성하였다. (중략)

• Restorative Dentistry and Endodontics
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• v.8 no.1
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• pp.161-166
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• 1982

The purpose of this study was to examine the influence of canal preparation on the property of apical seal. Seventy canals from extracted human maxillary and mandibular teeth were randomly selected and divided into two groups: conventional group and step-back group. Thirty five canals in one group were enlarged with a, conventional preparation method and thirty five canals in the other group were instrumented in a step-back method with K-file. After instrumentation sixty canals were obturated by lateral condensation of gutta percha and zinc oxide eugenol cement, and five canals in each group were not filled and used as control. All the specimens were immersed in 2% methylene blue dye solution and the depth of dye penetration into the canals were observed by macroscope at the intervals of 1 day, 2 days, and 7 days. The following results were obtained. 1. All the canals experimented showed varying degrees of dye penetration. 2. There was no significant difference between conventional method and step-back method in the depth of dye penetration and the degree of dye penetration tended to increase with time passage in both groups. 3, In conventional preparation group the mean dye penetration was 3.6mm at 1 day, 4.8mm at 2 days. and 6.5mm at 7 days. 4. In step-back prepareation group, the specimens exposed to the dye for 1 day showed mean dye penetration of 4.1mm, and the specimens immersed in the dye for 2 days and 7 days revealed mean dye penetration of 4.6mm and 6.2mm respectively.

• Journal of the Korean Operations Research and Management Science Society
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• v.26 no.4
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• pp.1-21
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• 2001

The purpose of this stuffy is to derive critical success factors for ERP system implementation by integrating managerial, technical. human resource and organizational culture factors welch have been proposed as influencing factors for the performance of ERP system implementation in previous studios. Especially, this stuffy divides ERP system implementation process into preparation stave, implement stage and settle-down and stabilization stave, and then derives critical success factors in each stage. The data for empirical analysis of the research model are collected from 64 companies and the respondents for questionnaire consist of ERP system implementation project managers and user department managers in companies which have already operated it after ERP system installation. The main results of this study are as follows. First, it derives 27 success factors through comprehensive review of various factors which may affect ERP system implementation performance, and categorizes them into one of three stapes preparation stave, implement stage, and settle-down and stabilization stage. Second, the relationship between many success factors at each stave (preparation stave, implement stage, and settle-down and stabilization stave) and performance variables is tested. As a result, the significant correlations between many success factors at each stage and ERP system implementation performance are found, and the difference among success factors in the degree of influencing the system performance is significantly shown. finally, the relationship between process-oriented performance variables and result-oriented performance ones is tested. As a result, it is found that there is significant correlation between process-oriented performance variables except for one variable-project resource management appropriateness - and result-oriented performance ones. The theoretical contribution of this study is to derive a comprehensive model of critical success factors for implementing ERP system project from the system deve1opment life cycle perspective, and empirically test it through field survey with a wide range of data collection. And, the practical implication of this study is to present the desirable guidelines for performing ERP system implementation project successfully.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.25 no.1
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• pp.99-107
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• 1995

The aim of this study was to evaluate clinician's detectability in the diagnosis of bone loss in the bifurcation of mandibular molars on periapical radiographs and Digital images. Periapical radiographs were obtained of the first molars in 2 dry mandibles after preparation of bony defects corresponding to degree I, degree II and degree III buccal furcation involvements. The radiographs were randomly presented to 39 clinicians(1 oral radiologist, 4 periodontist, 34 general dentists) who were asked to determine the presence or absence of bone loss. Periapical films were digitized with a TV camera. Digital images were assessed by 15 clinicians(1 oral radiologist, 4 periodontist, 10 general dentists). I. the overall diagnostic accuracy of Digital images for detection of bone loss in the bifurcation of mandibular molars was higher than that of the periapical radiographs. 2. the largest increase in diagnostic accuracy was found between lesion grade II and III on both radiographs and Digital images(P<0.05). 3. there was no significant difference between the standard state and the controlled contrast state on Digital images. 4. the overall diagnostic accuracy of I radiologist and 4 periodontists was better than that of the general dentists for detecting bifurcation involvements.

• Journal of the Korean Wood Science and Technology
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• v.23 no.2
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• pp.26-31
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• 1995

Acetylcellulose(AC) was prepared with steam exploded wood(EXW) and EXW after delignification with sodium chlorite, pine (Pinus densiflora) and oak (Quercus mongolica) woods. The color of acetylated pine and oak exploded wood was brown, degree of substitution(D.S) of pine was 1.47~2.09, and this of oak was 1.49~2.29. The hemicellulose content of acetylated pine and oak exploded wood was 0~3.4% and 1.49~11.3%, individually. The degree of substitution of acetylated wood prepared from delignified EXW in the pine and oak wood was 0.50~0.71 and 0.70~0.88, individually. Hemicellulose content of acetylated EXW with sodium chlorite after delignification in the pine and oak wood was less than 1% and 0.6~2.5%. The color of acetylated wood after delignification was white. IR-spectra of acetylated pine and oak EXW after delignification were found that peaks at around 1740$cm^{-1}$ and 1200$cm^{-1}$ increase markedly, due to ester carbonyl group.

• Journal of the Korean Burn Society
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• v.24 no.2
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• pp.30-33
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• 2021

Purpose: Dalgona, a kind of candy made of caramelized sugar, is a popular snack for children. Given the popularity of preparing dalgona, increasingly many patients are treated for burns sustained while preparing dalgona. We report the clinical features and dangers of burns from dalgona. Methods: We retrospectively reviewed the clinical records of 11 inpatients and outpatients who had been treated for burns they received while preparing dalgona from March 2020 to December 2020. The data reviewed were age, sex, the severity of the burn, the size and location of the burn, the type of treatment, and the place where the injury occurred. Results: The age of the patients ranged from 3 to 19 years, and the average age was 10.2 years (2 male, 9 female). Three patients had superficial second-degree burns, while eight had deep second-degree or third-degree burns. Most of the cases were treated with a local skin flap or skin graft. All the burned lesions were on the hands and feet. In all cases, the burns occurred at home due to accidental spillage. Conclusion: Most of the patients were children and teenagers, and they had serious burns. Therefore, we report these findings to emphasize the need for public awareness of the potential for burn injuries to occur during dalgona preparation.

• Journal of Environmental Impact Assessment
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• v.6 no.2
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• pp.181-188
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• 1997

Vegetation is an important factor in EIA(Environmental Impact Assessment) and it is assessed according to DGN(Degree of Green Naturality) in EIS(Environmental Impact Statement) preparation. But DGN has room for improvement of assessing vegetation Status. This study introduced NDVI(Normalized Difference Vegetation Index) for improving status assessment method that subjects to DGN. For the application of NDVI, Landsat TM data of Chunchon on May 2, 1989 and June 1, 1994, and data of Ulsan on November 5, 1984, November 2, 1992 and May 9, 1994 were used. It compared NDVI with DGN according to season and location. The correlation coefficient value for the spring image (1994, 0.7, p=0.01) was proved to be higher than that of autumn (1984, 0.5, p=0.01).