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정창신,이상혁,김현열,백현준,남경진,조홍재,정윤주 한국유방암학회 2017 Journal of Breast Disease Vol.5 No.2
Purpose: This retrospective study evaluated the utility of shear wave elastography (SWE), Tozaki’s visual pattern classification, and conventional Breast Imaging Reporting and Data System (BI-RADS) classification for differentiating between benign and malignant lesions. Methods: Between May 2015 and July 2016, 388 patients underwent SWE and B-mode ultrasonography. The BI-RADS system was used to exclude cases with category 1–2 lesions or unbiopsied category 3 lesions. A total of 100 patients with 100 solid breast masses underwent tissue sampling (ultrasonography-guided core biopsy or vacuum-assisted biopsy) or surgical excision. The quantitative elasticity was measured for each lesion, and the imaging and histological findings were compared. Results: The mean age of the patients was 51 years (range, 18–79 years). Histological examination identified 50 malignant lesions and 50 benign lesions. According to the BI-RADS classification, 20 lesions were classified as category 3, 56 as category 4, and 24 as category 5. Based on the Tozaki classification, 39 lesions were classified as pattern 1, seven as pattern 2, 23 as pattern 3, and 31 as pattern 4. If patterns 1 and 2 were assumed to be benign, and patterns 3 and 4 were assumed to be malignant, the combination of BI-RADS and SWE provided a sensitivity of 100% (50/50), a specificity of 92.0% (46/50), a positive predictive value of 92.5% (50/54), and a negative predictive value of 100% (50/50). Conclusion: The combination of SWE and BI-RADS was useful for evaluating breast lesions, improved the specificity of ultrasonography and may help facilitate appropriate treatment planning.
정창신,정호원 한국데이타베이스학회 1998 국제학술대회 Vol.2 No.1
본 논문에서는 국제표준화기구(ISO)에서 1999년을 목표로 표준화하고 있는 SPICE(Software Process Improvement & Capability dEtermination) 심사 모형을 사용하여 프로세스 속성의 위험 분석 방법을 제시하고 있다. 위험 분석에 사용된 자료는 통신관련 소프트웨어를 개발하는 조직의 공학 범주에서 4개 프로세스를 선정하여 실제로 심사한 결과이다. 또한 위험 분석에서 민감도 분석이 어떻게 활용될 수 있는지를 설명한다. 마지막으로 위험분석과 소프트웨어 프로세스 개선 방향 설정과의 관계를 설명한다.
한국 어린이의 영구 견치 및 소구치의 맹출 시기와 치근 발육
정창신,정연화,조봉혜,Cheong, Chang-Shin,Jung, Yun-Hoa,Cho, Bong-Hae 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.3
Purpose : The aim of this study was to investigate the timing and sequence of eruption of permanent canine and premolars, and to evaluate tooth calcification stage on emergence in Korean children. Materials and Methods : The sample was comprised of 1,266 children (male 720, female 546) aged from 7-13 years. Tooth eruption and calcification stages were determined through oral and panoramic radiographic examination, respectively. Probit analysis was used to calculate the timing of tooth eruption and tooth calcification stage from these cross-sectional data. Results : In both males and females, eruption occurred around the time when one third of tooth root or more was formed. The sequence was as follows: first premolar, canine, and second premolar in maxilla, and canine, first premolar and second premolar in mandible. Tooth eruption occurred earlier in girls compared with boys, averaging 0.63 years. Conclusions : Eruption sequence is identical in males and females with a trend for females to erupt earlier than males. Tooth eruption becomes earlier over the past decades in Korean children.