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  1. Article: The most critical trait of great researcher.

    Choi, Yong-Geun

    Journal of the Korean Association of Oral and Maxillofacial Surgeons

    2020  Volume 46, Issue 4, Page(s) 219

    Language English
    Publishing date 2020-08-28
    Publishing country Korea (South)
    Document type Editorial
    ZDB-ID 2763851-0
    ISSN 2234-5930 ; 2234-7550
    ISSN (online) 2234-5930
    ISSN 2234-7550
    DOI 10.5125/jkaoms.2020.46.4.219
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Survey of the use of statistical methods in

    Choi, Yong-Geun

    Journal of the Korean Association of Oral and Maxillofacial Surgeons

    2018  Volume 44, Issue 1, Page(s) 25–28

    Abstract: Objectives: This study aimed to describe recent patterns in the types of statistical test used in original articles that were published in : Materials and methods: Thirty-six original articles published in the : Results: Twenty-two types of ... ...

    Abstract Objectives: This study aimed to describe recent patterns in the types of statistical test used in original articles that were published in
    Materials and methods: Thirty-six original articles published in the
    Results: Twenty-two types of statistical test were used. Statistical test type was not reported in four original articles and classified as unclear in 5%. The four most frequently used statistical tests constituted 47% of the total tests and these were the chi-square test, Student's t-test, Fisher's exact test, and Mann-Whitney test in descending order. Regression models, such as the Cox proportional hazard model and multiple logistic regression to adjust for potential confounding variables, were used in only 6% of the studies. Normality tests, including the Kolmogorov-Smirnov test, Levene test, Shapiro-Wilk test, and Scheffé's test, were used diversely but in only 10% of the studies.
    Conclusion: A total of 22 statistical tests were identified, with four tests occupying almost half of the results. Adoption of a nonparametric test is recommended when the status of normality is vague. Adjustment for confounding variables should be pursued using a multiple regression model when the number of potential confounding variables is numerous.
    Language English
    Publishing date 2018-02-26
    Publishing country Korea (South)
    Document type Journal Article
    ZDB-ID 2763851-0
    ISSN 2234-5930 ; 2234-7550
    ISSN (online) 2234-5930
    ISSN 2234-7550
    DOI 10.5125/jkaoms.2018.44.1.25
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: The conquest of errors.

    Choi, Yong-Geun

    Journal of the Korean Association of Oral and Maxillofacial Surgeons

    2017  Volume 43, Issue 4, Page(s) 213

    Language English
    Publishing date 2017-08-24
    Publishing country Korea (South)
    Document type Editorial
    ZDB-ID 2763851-0
    ISSN 2234-5930 ; 2234-7550
    ISSN (online) 2234-5930
    ISSN 2234-7550
    DOI 10.5125/jkaoms.2017.43.4.213
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: The current problem with journal review systems.

    Choi, Yong-Geun

    Journal of the Korean Association of Oral and Maxillofacial Surgeons

    2014  Volume 40, Issue 2, Page(s) 98–99

    Language English
    Publishing date 2014-04-28
    Publishing country Korea (South)
    Document type Journal Article
    ZDB-ID 2763851-0
    ISSN 2234-5930 ; 2234-7550
    ISSN (online) 2234-5930
    ISSN 2234-7550
    DOI 10.5125/jkaoms.2014.40.2.98
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Clinical statistics: five key statistical concepts for clinicians.

    Choi, Yong-Geun

    Journal of the Korean Association of Oral and Maxillofacial Surgeons

    2013  Volume 39, Issue 5, Page(s) 203–206

    Abstract: Statistics is the science of data. As the foundation of scientific knowledge, data refers to evidentiary facts from the nature of reality by human action, observation, or experiment. Clinicians should be aware of the conditions of good data to support ... ...

    Abstract Statistics is the science of data. As the foundation of scientific knowledge, data refers to evidentiary facts from the nature of reality by human action, observation, or experiment. Clinicians should be aware of the conditions of good data to support the validity of clinical modalities in reading scientific articles, one of the resources to revise or update their clinical knowledge and skills. The cause-effect link between clinical modality and outcome is ascertained as pattern statistic. The uniformity of nature guarantees the recurrence of data as the basic scientific evidence. Variation statistics are examined for patterns of recurrence. This provides information on the probability of recurrence of the cause-effect phenomenon. Multiple causal factors of natural phenomenon need a counterproof of absence in terms of the control group. A pattern of relation between a causal factor and an effect becomes recognizable, and thus, should be estimated as relation statistic. The type and meaning of each relation statistic should be well-understood. A study regarding a sample from the population of wide variations require clinicians to be aware of error statistics due to random chance. Incomplete human sense, coarse measurement instrument, and preconceived idea as a hypothesis that tends to bias the research, which gives rise to the necessity of keen critical independent mind with regard to the reported data.
    Language English
    Publishing date 2013-10-22
    Publishing country Korea (South)
    Document type Journal Article ; Review
    ZDB-ID 2763851-0
    ISSN 2234-5930 ; 2234-7550
    ISSN (online) 2234-5930
    ISSN 2234-7550
    DOI 10.5125/jkaoms.2013.39.5.203
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Epidemiology of Implant Mortality Disparity Among Intraoral Positions and Prosthesis Types.

    Choi, Yong-Geun / Eckert, Steven E / Kang, Kyung Lhi / Shin, Sang-Wan / Kim, Young-Kyun

    The International journal of oral & maxillofacial implants

    2017  Volume 32, Issue 3, Page(s) 525–532

    Abstract: Purpose: To examine the disparity of single-crown implant failure with a similar loss of the splinted prosthesis in differing anatomical locations while controlling for other demographic and clinical variables that may confound the relationship between ... ...

    Abstract Purpose: To examine the disparity of single-crown implant failure with a similar loss of the splinted prosthesis in differing anatomical locations while controlling for other demographic and clinical variables that may confound the relationship between prosthesis types and implant loss.
    Materials and methods: A multicenter retrospective cohort study was designed to include patients treated with dental implants from 2003 to 2014. The variables included age, sex, systemic disease, bone graft, implant placement date, position of dental implant, length of dental implant, diameter of dental implant, loading time, type of prosthesis, type of opposing occlusion, latest check date, and survival or loss of the dental implant. The demographic and clinical variables' influence on the survival of dental implants was estimated by the Kaplan-Meier method. The position and diameter were adjusted for the accurate estimation of the relationship between the prosthesis type and survival of the dental implant with the Cox proportional hazard method.
    Results: A total of 1,151 dental implants from 403 patients were ascertained. After adjusting for the confounding effect of position and diameter, single-crown prostheses were 38.1 (95% CI: 15.1-118) times more likely to be lost than the connected-type prostheses. For single-crown implants, the waiting time for osseointegration before loading was the highest for the maxillary molar position and the lowest for the mandibular molar position (P < .0001), while the most frequent implant loss occurred in the maxillary anterior area, and the second frequent area was the maxillary molar position; the lowest occurrence of implant loss was for the mandibular molar position. This disparity was statistically significant (P = .0271).
    Conclusion: Despite the high survival rates of endosseous implants as a whole, since the variation of implant loss was observed among the different anatomical positions for single-crown implants, special attention has to be given to the maxillary anterior and maxillary molar positions. A longer healing time assuming compensation for disadvantageous bone quality was not directly effective in increasing implant longevity in the vulnerable positions.
    Language English
    Publishing date 2017-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 632880-5
    ISSN 1942-4434 ; 0882-2786
    ISSN (online) 1942-4434
    ISSN 0882-2786
    DOI 10.11607/jomi.5044
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2179: Show issues Location:
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  7. Book ; Online: A Recent species of Frambocythere Colin, 1980 (Ostracoda, Crustacea) from a cave in South Korea; the first extant representative of a genus thought extinct since the Eocene

    Smith, Robin J. / Lee, Jimin / Choi, Yong Geun / Chang, Cheon Young / Colin, Jean-Paul

    eISSN: 2041-4978

    2018  

    Abstract: The non-marine ostracod genus Frambocythere Colin, 1980 (Limnocytheridae, Timiriaseviinae) had a previously known stratigraphical range from the Albian (Lower Cretaceous) through to the Lutetian (middle Eocene). However, during surveys of Seongryu Cave ... ...

    Abstract The non-marine ostracod genus Frambocythere Colin, 1980 (Limnocytheridae, Timiriaseviinae) had a previously known stratigraphical range from the Albian (Lower Cretaceous) through to the Lutetian (middle Eocene). However, during surveys of Seongryu Cave in Uljin-gun Province, South Korea, specimens of an extant species of Frambocythere were recovered. This extends the stratigraphic range of the genus by more than 40 million years to the present, and the species is, therefore, considered to be a relict ‘living fossil’. This newly described species is most similar in morphology to Frambocythere gr. tumiensis (Helmdach, 1978), reported from Thanetian (Paleocene) deposits of the Paris Basin. The living species was found in the hypogean realm, in contrast to the fossil species, which were all epigean. It is hypothesized that, like the genus Kovalevskiella Klein, 1963, which belongs to the same lineage, Frambocythere migrated from epigean to hypogean habitats.
    Subject code 590
    Language English
    Publishing date 2018-09-27
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: First discovery of a cave-dwelling Tineid moth (Lepidoptera, Tineidae) from East Asia

    Byun, Bong-Kyu / Shin, Sat-Byul / Bae, Yang-Seop / Kim, Do Sung / Choi, Yong Geun

    Journal of forestry research. 2014 Sept., v. 25, no. 3

    2014  

    Abstract: In this study, we report Monopis crocicapitella (Clemens, 1859) (Tineidae), which was collected from bat guano in a cave in the southern region of Korea, for the first time from East Asia. We briefly redescribe and illustrate the external morphology and ... ...

    Abstract In this study, we report Monopis crocicapitella (Clemens, 1859) (Tineidae), which was collected from bat guano in a cave in the southern region of Korea, for the first time from East Asia. We briefly redescribe and illustrate the external morphology and genital structures of both sexes. Also, we discuss the local habitat characteristics and some of the ecological information that was observed during our field investigation.
    Keywords Chiroptera ; Tineidae ; animal manures ; habitats ; moths ; Korean Peninsula
    Language English
    Dates of publication 2014-09
    Size p. 647-651.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 2299615-1
    ISSN 1993-0607 ; 1007-662X
    ISSN (online) 1993-0607
    ISSN 1007-662X
    DOI 10.1007/s11676-014-0503-9
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Comparison of backbone dynamics of the type III antifreeze protein and antifreeze-like domain of human sialic acid synthase.

    Choi, Yong-Geun / Park, Chin-Ju / Kim, Hee-Eun / Seo, Yeo-Jin / Lee, Ae-Ree / Choi, Seo-Ree / Lee, Shim Sung / Lee, Joon-Hwa

    Journal of biomolecular NMR

    2015  Volume 61, Issue 2, Page(s) 137–150

    Abstract: Antifreeze proteins (AFPs) are found in a variety of cold-adapted (psychrophilic) organisms to promote survival at subzero temperatures by binding to ice crystals and decreasing the freezing temperature of body fluids. The type III AFPs are small ... ...

    Abstract Antifreeze proteins (AFPs) are found in a variety of cold-adapted (psychrophilic) organisms to promote survival at subzero temperatures by binding to ice crystals and decreasing the freezing temperature of body fluids. The type III AFPs are small globular proteins that consist of one α-helix, three 3(10)-helices, and two β-strands. Sialic acids play important roles in a variety of biological functions, such as development, recognition, and cell adhesion and are synthesized by conserved enzymatic pathways that include sialic acid synthase (SAS). SAS consists of an N-terminal catalytic domain and a C-terminal antifreeze-like (AFL) domain, which is similar to the type III AFPs. Despite having very similar structures, AFL and the type III AFPs exhibit very different temperature-dependent stability and activity. In this study, we have performed backbone dynamics analyses of a type III AFP (HPLC12 isoform) and the AFL domain of human SAS (hAFL) at various temperatures. We also characterized the structural/dynamic properties of the ice-binding surfaces by analyzing the temperature gradient of the amide proton chemical shift and its correlation with chemical shift deviation from random coil. The dynamic properties of the two proteins were very different from each other. While HPLC12 was mostly rigid with a few residues exhibiting slow motions, hAFL showed fast internal motions at low temperature. Our results provide insight into the molecular basis of thermostability and structural flexibility in homologous psychrophilic HPLC12 and mesophilic hAFL proteins.
    MeSH term(s) Adaptation, Physiological/genetics ; Amino Acid Sequence ; Antifreeze Proteins, Type III/metabolism ; Antifreeze Proteins, Type III/ultrastructure ; Cold Temperature ; Crystallography, X-Ray ; Humans ; Models, Molecular ; Molecular Sequence Data ; Nuclear Magnetic Resonance, Biomolecular ; Oxo-Acid-Lyases/metabolism ; Oxo-Acid-Lyases/ultrastructure ; Protein Structure, Tertiary ; Sequence Alignment
    Chemical Substances Antifreeze Proteins, Type III ; N-acetylneuraminate synthase (EC 2.5.1.56) ; Oxo-Acid-Lyases (EC 4.1.3.-)
    Language English
    Publishing date 2015-02
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1081696-3
    ISSN 1573-5001 ; 0925-2738
    ISSN (online) 1573-5001
    ISSN 0925-2738
    DOI 10.1007/s10858-014-9895-2
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4132: Show issues Location:
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  10. Article: Heat transfer to the implant-bone interface during preparation of a zirconia/alumina abutment.

    Huh, Jung-Bo / Eckert, Steven E / Ko, Seok-Min / Choi, Yong-Geun

    The International journal of oral & maxillofacial implants

    2009  Volume 24, Issue 4, Page(s) 679–683

    Abstract: Purpose: Excessive heat at the implant-bone interface may compromise osseointegration. This study examined the heat generated at the implant surface during preparation of a zirconia/alumina abutment in vitro.: Materials and methods: Sixty zirconia/ ... ...

    Abstract Purpose: Excessive heat at the implant-bone interface may compromise osseointegration. This study examined the heat generated at the implant surface during preparation of a zirconia/alumina abutment in vitro.
    Materials and methods: Sixty zirconia/alumina abutments were randomized into 12 experimental groups. The abutments were connected to implants and embedded in an acrylic resin block in a 37 degrees C water bath. The abutments were reduced by 1 mm in height over a period of 1 minute with a high-speed handpiece and then polished for 30 seconds with a low-speed handpiece, both with and without an air/water coolant. Temperatures were recorded via thermocouples at the cervical, middle, and apical part of the implant surfaces. The Mann-Whitney rank-sum test was used to assess the statistical significance of the difference in temperature between the abutment/implant complexes altered with and without coolant.
    Results: The 1-mm reduction with the high-speed handpiece without coolant resulted in a maximum temperature of 41.22 degrees C at the cervical portion of the implant. Three of four temperatures above 40 degrees C were observed at the cervical part of the implant following use of the high-speed handpiece without coolant. The temperature difference between "with coolant" and "without coolant" during both low-speed polishing and high-speed reduction was statistically significant at the cervical portion of the implant (P = .009). In contrast, the temperature difference between "with coolant" and "without coolant" during both low-speed polishing and high-speed reduction was not statistically significant at the middle and apical parts of the implant (P > .05).
    Conclusions: Preparation of a zirconia/alumina abutment caused an increase in temperature within the implant, but this temperature increase did not reach the critical levels described in the implant literature.
    MeSH term(s) Acrylic Resins ; Air ; Aluminum Oxide/chemistry ; Dental Abutments ; Dental High-Speed Equipment ; Dental Implants ; Dental Materials/chemistry ; Dental Polishing ; Dental Prosthesis Design/instrumentation ; Energy Transfer ; Hot Temperature ; Humans ; Jaw/physiology ; Materials Testing ; Models, Anatomic ; Surface Properties ; Temperature ; Thermometers ; Time Factors ; Water/chemistry ; Zirconium/chemistry
    Chemical Substances Acrylic Resins ; Dental Implants ; Dental Materials ; Water (059QF0KO0R) ; Zirconium (C6V6S92N3C) ; Aluminum Oxide (LMI26O6933) ; zirconium oxide (S38N85C5G0)
    Language English
    Publishing date 2009-07
    Publishing country United States
    Document type Comparative Study ; Journal Article ; Randomized Controlled Trial
    ZDB-ID 632880-5
    ISSN 1942-4434 ; 0882-2786
    ISSN (online) 1942-4434
    ISSN 0882-2786
    Database MEDical Literature Analysis and Retrieval System OnLINE

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