• 유통과학연구
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• 제15권10호
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• pp.41-50
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• 2017

Purpose - Online product review has become a crucial part of the online retailer's market performance for a wide range of products. This research aims to investigate how an individual reviewer's review frequency and timing affect her/his average attitude toward products. Research design, data, and methodology - To conduct reviewer-level analysis, this study uses 42,172 posted online review messages generated by 6,941 identified reviewers for 59 movies released in the South Korea from July 2015 to December 2015. This study adopts Tobit model specification to take into account the censored nature and the selection bias arising from the nature of J-shaped distribution of movie rating. Results - Our estimation results support that the negative impact of review frequency and timing on valence. Furthermore, review timing has an inverted-U relationship with the user's average valence and enhance the negative effect of review frequency. Conclusions - This study contributes to the growing literature on the understanding how eWOM is generated at the individual consumer level. On the basis of the main empirical findings, this study provides insights into building a recommendation system in online retail store based on the consumer's review history data - frequency, timing, and valence.

• 영어어문교육
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• 제11권2호
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• pp.51-66
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• 2005

This study investigates the feasibility of incorporating student evaluations of peer review interactions into the course grade for an EFL writing course. The use of such evaluations offers a way to grade the process of writing more directly than using writing portfolios alone. Moreover, evaluating peer review interactions highlights the social aspect of writing, which is valuable in the current post-process climate in writing instruction. The 18 members of a semester-long EFL writing course at a Korean university were trained in peer response for one half of a semester; then performed evaluations of peer review interactions during the second half of the semester as part of their writing course. Student evaluations were examined to reveal whether any bias occurred due to relative age, gender, major, or question type. The results revealed no such biases. Therefore, it is suggested that students are capable of providing fair evaluations of peers, which means the evaluations can be factored into the course grade in order to evaluate the social aspect of the writing process.

• 한국산학기술학회논문지
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• 제19권1호
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• pp.321-330
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• 2018

본 연구는 유아를 대상으로 한 반편견 교육활동 및 프로그램들과 관련된 국내의 실천연구 동향을 살펴보고자 하였다. 보다 구체적으로는 유아기 반편견 교육활동 및 프로그램들이 주요하게 다루고 있는 편견의 주제를 살펴보고, 해당 교육활동에서 적용하고 있는 교수-학습의 매체나 접근법을 분석함으로써 반편견 교육활동에 대한 이해를 돕고자 하였다. 이를 위해 유아기 반편견 교육 연구가 처음 시작된 1995년부터 2017년까지 수행된 반편견 교육활동이나 프로그램을 개발, 적용한 실천연구 125편을 분석하였다. 분석결과 시기적으로는 2000년-2004년 사이에 절반에 가까운 53편의 연구가 수행되었으며, 단일한 편견주제를 다룬 교육활동 연구들이 64.8%로 두 가지 이상의 편견주제를 다중으로 다룬 교육활동 연구보다 많았다. 한 가지의 편견에 초점을 둔 교육활동의 주제로는 장애관련 편견과 젠더관련 편견이 가장 많이 다루어진 것으로 나타났다. 여러 편견주제를 함께 다룬 다중편견주제의 경우 절반 이상이 세 가지에서 다섯 가지 사이의 편견주제들을 다루고 있었으며, 가장 빈번하게 다루어진 내용은 외모, 가족, 장애, 젠더, 인종, 계층, 문화와 관련한 편견의 순서로 나타났다. 반편견 교육에 사용된 교수-학습 매체 및 방법은 동화를 활용한 것이 압도적으로 많아 60.8%로 나타났고, 통합적 환경이 그 뒤를 이어 14.4%를 차지하였다. 이러한 분석 결과는 유아기 반편견 교육의 주제 범위 체계화, 접근 방법 다양화의 기초자료로 활용될 수 있을 것으로 생각된다.

• Korean Journal of Acupuncture
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• 제36권1호
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• pp.1-18
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• 2019

Objectives : The purpose of this study was to evaluate the effectiveness and safety of acupuncture treatment for recovery of patients with vertebral compression fracture(VCF). Methods : We searched ten English and Chinese and seven Korean database up to April 2018. Randomised controlled trials(RCTs), quasi-RCTs, non-radomised Controlled Trials(CCTs) were eligible. Quasi-RCTs and CCTs were assessed only for safety assessment. Pain and adverse events were primary outcome of this review. Quality of life, dysfunction, patient satisfaction, incidence of new vertebral compression fracture were regarded as secondary outcomes. The risk of bias was assessed by two independent authors using the Cochrane risk of bias tool. Level of evidence was tabulated using the GRADE methods. Results : Of 1656 screened, 15 RCTs, 1 quasi-RCT and 3 CCTs were included. Number of participants per study ranged from 45 to 135. Most of the studies had unclear or high risk of bias and considerable heterogeneity in terms of type of intervention, comparison and time-points for outcome measurement. Compared to usual care alone, acupuncture combined with usual care showed short-term favorable results for pain relief in patients with VCF(5 studies, n=252, MD -1.05 point on a 0 to 10 point scale, 95% CI -1.45 to -0.65, $I^2=74%$). Four studies reported mild and temporary adverse events, and no serious adverse events were reported. One study descriptively reported that acupuncture was effective for improving quality of life without providing numerical outcomes. There were no reports of patient satisfaction and incidence of new VCF. Conclusions : Level of evidence is very low for the effectiveness and safety of acupuncture for pain, harms and other clinical outcomes in patients with VCF. Included studies suffered from incomplete reporting, high or unclear risk of bias and substantial heterogeneity between studies. Future high-quality RCTs are needed to assess whether acupuncture is beneficial for recovery of patients with VCF.

• Journal of Acupuncture Research
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• 제37권3호
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• pp.137-150
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• 2020

The purpose of this study was to evaluate the evidence supporting the effectiveness of moxibustion treatment for osteoarthritis. There were 9 databases used to retrieve randomized controlled trials (RCTs) that used moxibustion as treatment for osteoarthritis. The quality of methodology for the RCTs was assessed using the Cochrane Risk of Bias tool [Review Manager (RevMan) Version 5.3 Windows, The Nordic Cochrane Centre, Copenhagen, Denmark]. The inclusion criteria for this review was met by 27 RCTs. All studies were conducted in China. A 4-week moxibustion treatment period was the most common. EX-LE4 and SP10 and GB34 acupoints were most frequently selected in the treatment of osteoarthritis. The most commonly used evaluation index was the visual analog scale (VAS). All studies, including a meta-analysis showed that moxibustion treatments were statistically significantly effective at treating knee osteoarthritis. However, well-designed randomized RCTs without a high risk of bias should be designed in the future.

• 척추신경추나의학회지
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• 제10권2호
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• pp.1-12
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• 2015

Objectives : To determine the effectiveness of Chuna manual therapy for headache Methods : We searched 6 electronic databases(Pubmed, CAJ, Oasis, RISS, DBPIA, KoreanTK) and 2 journals up to Oct 2015. We included randomized controlled trials(RCTs) using Chuna manual therapy for headache. The methodological quality of each RCT was assessed by the Cochrane risk of bias tool. Results : 9 RCT studies were eligible in our review. The meta-analysis of 6 studies showed favorable results for the use of Chuna manual therapy. High risk of bias were observed in all studies. Conclusions : Although there are favorable results with meta-analysis, our systematic review arehighly dependent on the single source of Chinese electrical database, CAJ. Now limited evidence is available tosupport Chuna manual therapy for headache and further well-designed RCTs should be encouraged.

• 한국도서관정보학회지
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• 제52권3호
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• pp.197-215
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• 2021

이 연구는 체계적 문헌고찰(systematic review) 연구방법을 활용하여 초등학생의 읽기이해력 향상을 위해 제공된 중재프로그램 실험연구들을 분석한 것이다. Cochrane의 핸드북을 적용하였으며, PICOTS-SD에 따라 핵심질문을 구성하였다. KCI에서 검색된 1,610건의 논문에서 포함기준과 배제기준을 적용하여, 최종 18건을 분석대상으로 선별하였다. Cochrane에서 제공하는 'RevMan5' 도구를 사용하여 비뚤림 위험을 평가하였다. 평가결과 대부분의 영역에서 비뚤림 위험도가 낮게 나타났다. 그리고 이들 논문들에 대한 정성적인 분석을 위해 자료요약표를 정리하였다. 이 결과, 중재프로그램의 유형은 다양하였으며, 고학년생을 적용대상으로 하는 경우가 많았다. 실험집단의 크기는 6명에서 29명이며, RCT 기반 연구보다 QED 기반 연구가 더 많았다. 중재시간은 40분이 가장 많았으며, 중재회기는 8회에서 24회로 나타났다. 그리고 모든 연구에서 중재프로그램은 읽기이해력 향상에 효과가 있는 것으로 나타났다.

• Imaging Science in Dentistry
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• 제51권4호
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• pp.363-372
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• 2021

Purpose: This systematic review and meta-analysis assessed the diagnostic accuracy of imaging examinations for the detection of peri-implant bone defects and compared the diagnostic accuracy between titanium (Ti) and zirconium dioxide (ZrO₂) implants. Materials and Methods: Six online databases were searched, and studies were selected based on eligibility criteria. The studies included in the systematic review underwent bias and applicability assessment using the Quality Assessment of Diagnostic Accuracy Studies 2 (QUADAS-2) tool and a random-effect meta-analysis. Summary receiver operating characteristic (sROC) curves were constructed to compare the effect of methodological differences in relation to the variables of each group. Results: The search strategy yielded 719 articles. Titles and abstracts were read and 61 studies were selected for full-text reading. Among them, 24 studies were included in this systematic review. Most included studies had a low risk of bias (QUADAS-2). Cone-beam computed tomography (CBCT) presented sufficient data for quantitative analysis in ZrO₂ and Ti implants. The meta-analysis revealed high levels of inconsistency in the latter group. Regarding sROC curves, the area under the curve (AUC) was larger for the overall Ti group (AUC=0.79) than for the overall ZrO₂ group (AUC=0.69), but without a statistically significant difference between them. In Ti implants, the AUCs for dehiscence defects(0.73) and fenestration defects(0.87) showed a statistically significant difference. Conclusion: The diagnostic accuracy of CBCT imaging in the assessment of peri-implant bone defects was similar between Ti and ZrO₂ implants, and fenestration was more accurately diagnosed than dehiscence in Ti implants.

• 한방재활의학과학회지
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• 제32권2호
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• pp.37-54
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• 2022

Objectives This review investigates the effectiveness of electroacupuncture for impairment of motor and sensory functions after spinal cord injury. Methods The databases used for the search were PubMed, Cochrane Library, EMBASE, China National Knowledge Infrastructure (CNKI), National Digital Science Library (NDSL), Koreanstudies Information Service System (KISS), Research Information Sharing Service (RISS), KMBASE, and Oriental Medicine Advanced Searching Integrated System (OASIS). The literature were searched using a total of 9 domestic and foreign databases. Randomized controlled trials (RCTs) using electroacupuncture as an intervention was selected. The selected studies are analyzed the risk of bias through Cochrane risk-of-bias tool, and meta-analysis was perfomed using RevMan version 5.3 (The Nordic Cochrane Centre, The Cochrane Collaboration, Copenhagen, Denmark). Results A total of 14 RCT studies were selected through 9 domestic and foreign databases, and analyzed. As a result of meta-analysis, when electroacupuncture was performed together with rehabilitation treatment or western drug treatment, it was effective in the recovery of motor and sensory functions of spinal cord injury patients. Conclusions This review suggests that electroacupuncture can be applied as an effective treatment for the recovery of motor and sensory functions of spinal cord injuries. However, there are several limitations, including the small number and heterogeneity of the included studies, as well as their poor methodological quality. Therefore, further, higher-quality studies should be required.

• Journal of Dental Anesthesia and Pain Medicine
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• 제22권1호
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• pp.1-10
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• 2022

Background: Inferior alveolar nerve block (IANB) is known to have a lower success rate for anesthesia in patients with irreversible pulpitis. This calls for supplementary techniques to effectively anesthetize such patients. This systematic review aimed to evaluate the published literature for determining the success rate of anesthesia induction using post-IANB intraligamentary (IL) injection in the mandibular teeth of patients with symptomatic irreversible pulpitis. The review question was, "What is the success rate of IL injection in the mandibular teeth of patients with irreversible pulpitis as a supplementary technique for endodontic treatment?" Methods: A thorough search of electronic databases and manual searches were performed. The protocol of the review was framed following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist and was registered in the International Prospective Register of Ongoing Systematic Reviews (PROSPERO) with a proper criterion for inclusion and exclusion of studies. The included studies were analyzed using the Cochrane Collaboration "Risk of Bias" tool. A meta-analysis that included a comparison of primary nerve block and supplemental IL injection was performed. The success rate was evaluated using the combined risk ratio (RR) with a random risk model. A funnel plot was created to measure publication bias. Results: After all analyses, four studies were included. In the forest plot representation, RRs were 3.56 (95% CI: 2.86, 4.44), which were in favor of the supplemental IL injections. Statistical heterogeneity was found to be 0%. These values suggest that supplemental IL injections provide better success rates for anesthesia. Conclusion: According to the pooled qualitative and quantitative analyses, supplemental IL injections increased anesthetic efficacy.