• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 International Conference
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• pp.395-400
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• 2007

Previous studies present the mixed results on online reputation mechanism. In this study, we have found that an approach based on Bayesian statistics can explain most results of previous studies which are conflicting with each others. With this model, we explain why negative ratings have more significant marginal impacts on sellers' reputation than positive ones do. Furthermore, we even show why the feedbacks with a few negative ratings may increase the value of the item and final prices by confirming buyers' prior beliefs on the sellers' reputation much more than those without negative ratings. Also, we explain why there are not many negative ratings. Even though some studies suggest this because of generosity of users, our model shows that the reason is that the existence of FS itself prevents bad sellers from participating to the market as a signal itself. Even further, we show how this extreme tendency of positive ratings gets even stronger as markets evolve. Finally, to validate our analytical results, we examine the previous studies and see what factors effect the outcomes of their analyses.

• 대한치과의사협회지
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• 제50권6호
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• pp.304-311
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• 2012

Eruption of the teeth can be disturbed by crowding, ectopic eruption path, retention for pathologic condition of follicle and periodontal ligament, local disturbances in the innervation, and delayed eruption for overlying obstacles in the eruption path. Eruption disturbance of permanent posterior teeth is taken with diverse therapeutic approaches according to the patient age, cooperation of patient, tooth position and maturity, degree of impaction, clinical features, and repercussion on the neighboring teeth. However, delayed treatment usually results in less favorable outcomes. Therefore, In order to prevent this situation, periodically radiographic examinations during the early mixed dentition period and early diagnosis of eruption disturbances of permanent posterior teeth are recommended.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2015년도 춘계학술대회 논문집
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• pp.128-129
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• 2015

Al-rich coatings were prepared on hot rolled low carbon steel by hot dipping method in molten Al-bath to investigate the corrosion resistance with the possible outcomes and defects of aluminized coatings in air and $Ar-0.2%SO_2$ mixed gases. Coating microstructure was composed of an inner Al-Fe intermetallic layer and outer Al-rich layer. Aluminum oxidized preferentially to the thin, outer, protective ${\alpha}-Al_2O_3$ layer, without forming the nonprotective iron/sulfur-oxide layer after heating at $800^{\circ}C$ for 20 h, in both the gases and provided the resistance against corrosion.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2015년도 춘계학술대회 논문집
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• pp.122-122
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• 2015

Al-rich coatings were prepared on hot rolled low carbon steel by hot dipping method in molten Al-bath to investigate the corrosion resistance with the possible outcomes and defects of aluminized coatings in air and $Ar-0.2%SO_2$ mixed gases. Coating microstructure was composed of an inner Al-Fe intermetallic layer and outer Al-rich layer. Aluminum oxidized preferentially to the thin, outer, protective ${\alpha}-Al_2O_3$ layer, without forming the nonprotective iron/sulfur-oxide layer after heating at $800^{\circ}C$ for 20h, in both the gases and provided the resistance against corrosion.

• 한국구조물진단유지관리공학회 논문집
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• 제6권4호
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• pp.91-98
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• 2002

Prediction for the compressive strength of concrete by non-destructive tests(NDT) has a tendency to show different outcomes according to various aggregates. The purpose of this study is to develop estimation equation by rebound number, ultrasonic velocity and combined method at concrete structures which used granite as coarse aggregates. The test variable is water/cement ratio(41.1%, 48.6%, 67.6%), curing method(moisture condition, dry condition) and age(7, 14, 28, 56). According to the test variable, new equation was suggested, and compared with the existing equations.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.791-795
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• 2005

A simulation model is proposed to evaluate the effect of correlations between activity durations on the overall project duration. The proposed model incorporates NORTA, a recent developed statistical method, into the simulation process to allow arbitrarily specified marginal distributions for activity durations and any desired correlation structure. The generality is of practical value when systematic data is not available and planners have to rely on arbitrary experts' estimation, which may involve a mixed situation when some activity durations are continuously distributed whereas others are discrete outcomes. The proposed model is validated by showing that the correlation coefficients of the simulation results are close to the originally specified ones. The simulation results are compared to two conventional approaches: PERT and simulation without correlation. The comparisons illustrate that the proposed model can provide important management information, which would otherwise be distorted due to the neglect of the correlations between activity durations.

• Journal of Korean Biological Nursing Science
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• 제25권4호
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• pp.256-265
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• 2023

Purpose: This study examined the definitions, diagnostic criteria, and measurements of sarcopenic obesity and identified effective exercise interventions that improve cardiometabolic outcomes in middle-aged and older adults, in whom the prevalence of sarcopenic obesity is increasing. Methods: This comprehensive review followed the principles of literature search, data extraction, and review, as described in the PRISMA 2009 guidelines. Results: The 11 articles included in this study presented different concepts of sarcopenic obesity. Exercise interventions for sarcopenic obesity varied in their effects. Resistance exercise improved muscle mass and physical function, while aerobic exercise primarily impacted obesity and cardiometabolic indicators. Combined exercise had mixed results across indicators. Conclusion: This study addressed a pressing public health concern in the context of an aging population, acknowledged the unique challenges of sarcopenic obesity, and attempted to clarify definitions and assessment methods, while identifying effective exercise interventions to reduce cardiometabolic risk. Sarcopenic obesity is a multifaceted condition with varying definitions and diagnostic criteria. Its association with cardiometabolic risk underscores the need for comprehensive assessments considering both muscle and obesity indicators. While exercise interventions hold promise for managing sarcopenic obesity, further research is required to establish effective strategies.

• 대한정형외과스포츠의학회지
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• 제10권1호
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• pp.18-26
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• 2011

목적: 단일 다발 전방 십자인대 재건술에서 동일한 고정 방법 하에 사용된 이식건 종류에 따른 임상적 결과와 이차 관절경을 통한 치유 상태를 비교하였다. 대상 및 방법: 2003년 8월부터 2008년 8월까지 전방 십자 인대 재건술을 시행 받은 환자 186예 중 최소 12개월 이상 추시가 가능하였고 동반인대 손상환자를 제외한 169예를 대상으로 하였다. 66예는 자가 슬괵건을, 42예는 자가슬괵건과 동종 경골건을 혼합하여 사용하였고, 61예는 동종 경골건을 이용하였다. 임상적 평가는 수술 전과 최종 추시 시 Lysholm 점수와 IKDC 평가 기준, Lachman, Pivot shift test, Telos 기구 검사를 이용하여 세 군을 비교 분석하였고, 이차 관절경을 통한 이식건의 치유상태를 관찰하였다. 결과: 수술 전과 최종 추시에서 Telos 스트레스 방사선 검사상에서 환측과 건측의 전방 전위 차이는 자가 슬괵건 군은 평균 $7.5{\pm}1.0$ mm에서 $1.6{\pm}1.0$mm로, 혼합건 군은 $7.6{\pm}1.1$ mm에서 $1.4{\pm}1.1$ mm로, 동종 경골건 군은 평균 $7.4{\pm}1.3$ mm에서 $2.5{\pm}1.3$ mm로 세 군 모두 통계적으로 유의하게 향상되었으며 세 군 간 차이는 없었다(p>0.05). Lysholm 슬관절 점수는 자가 슬괵건 군은 58.6점에서 92.3점으로, 혼합건 군은 60.6점에서 92.6점으로, 동종 경골건 군은 55.3점에서 91.5점으로 세 군 모두에서 통계적으로 유의하게 향상되었고 세 군 사이에 차이는 없었다(p>0.05). 나사 제거술시 시행한 이차 관절경에서 인대의 이완 정도나 활액막의 재형성 정도는 자가 슬괵건을 이용한 군과 혼합건 군이 동종 경골건 군보다 더 양호한 결과를 보였다. 결론: 자가 슬괵건, 혼합건 및 동종 경골건을 이용한 단일 다발 전방 십자 인대 재건술 모두 각 군간의 유의한 차이 없이 양호한 임상적 결과를 얻었고 이차 관절경에서 자가 슬괵건과 혼합건을 사용한 경우에서 우수한 활액막 재형성 소견을 보였다. 따라서 자가 슬괵건이 가늘거나 길이가 짧은 경우 채취한 건에 동종 경골건이 보강된 혼합건 사용을 고려할 수 있다고 사료된다.

• Asian Pacific Journal of Cancer Prevention
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• 제13권5호
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• pp.1935-1941
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• 2012

Introduction: Uterine sarcomas are a group of heterogenous and rare malignancies of the female genital tract and there is a lack of consensus on prognostic factors and optimal treatment. Objective and Methodology: To perform a retrospective evaluation of clinicopathological characteristics, prognostic factors and treatment outcomes of 93 patients with uterine sarcomas who were diagnosed and treated at 4 different centers from November 2000 to October 2010. Results: Of the 93 patients, 58.0% had leiomyosarcomas, 26.9% malignant mixed Mullerian tumors, 9.7% endometrial stromal sarcomas, and 5.4% other histological types. According to the last International Federation of Gynecology and Obstetrics (FIGO) staging, 43.0% were stage I, 20.4% were stage II, 22.6% were stage III and 14.0 % were stage IV. Median relapse free survival (RFS) was 20 months (95% confidence interval (CI), 12.4-27.6 months), RFS after 1, 2, 5 years were 66.6%, 44.1%, 16.5% respectively. Median overall survival (OS) was 56 months (95% CI, 22.5-89.5 months), and OS after 1, 2, 5 years was 84.7%, 78%, 49.4% respectively. Multivariate analysis showed that age ${\geq}60$ years and high grade tumor were significantly associated with poor OS and RFS; patients administered adjuvant treatment with sequential chemotherapy and radiotherapy had longer RFS time. Among patients with leiomyosarcoma, in addition to age and grade, adjuvant treatment with sequential chemotherapy and radiotherapy after surgery had significant effects on OS. Conclusion: Uterine sarcomas have poor progrosis even at early stages. Prognostic factors affecting OS were found to be age and grade.

• 과학교육연구지
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• 제45권2호
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• pp.257-273
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• 2021

본 연구는 예비수학교사 대상의 수학교육론과 미적분학 강좌를 비대면수업으로 진행한 결과와 대면수업으로 진행한 결과 사이의 차가 무엇인지를 살펴보기 위한 목적으로 진행하였다. 본 연구의 대상인 '수학교육론' 및 '미적분학' 강좌의 비대면수업은 '비대면수업 수업설계 모형'에 근거하여 계획, 개발, 실행되고 평가하였다. 본 연구를 통해 수학교과교육학 및 수학교과내용학 강좌운영에서 '비대면수업/혼합수업'과 '대면수업'의 차이가 무엇인지 살펴보았고, 수학교과교육학 과목과 수학교과내용학 과목에 대한 비대면수업에 대한 학생들의 인식을 조사하였으며, '수학교육론' 강좌와 '미적분학' 강좌에서 비대면수업과 대면수업에서 평가결과의 차가 있는지 분석하였다. 향후 예비수학교사교육에서 비대면수업 및 혼합수업 역량이 향상될 수 있는 기회를 제공하고, 지속적인 연구가 수행되길 기대한다.