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송찬이,임지용,오상훈,김효준 대한응급의학회 2022 대한응급의학회지 Vol.33 No.6
Objective: We aimed to investigate diagnostic accuracy of the STONE score and the modified STONE score by external validation in a large-scale cohort. Methods: We retrospectively reviewed the medical records of patients with suspected urinary stones who underwent computed tomography in the emergency center of a single tertiary hospital from 2014 to 2015. We compared and analyzed our cohort and two original studies with each other. Patients were categorized into three risk groups (low, moderate, and high) according to both scoring systems. The prevalence of urinary stones and alternative diagnoses was evaluated in each group. We calculated sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) with our data for each score performance. Results: Eight hundred fifty-six patients out of a total of 1,013 were diagnosed with urinary stones. The prevalence of urinary stones in the high-risk group of the STONE and the modified STONE scores were 91.1% and 91.2%, respectively. The areas under the receiver operating characteristic curve of both scores were 0.71 and 0.73, respectively. The optimal cutoff value for predicting urinary stones using the STONE score was 9, with 87.9% sensitivity, 45.9% specificity, 89.8% PPV, and 40.9% NPV. In the case of the modified STONE score, the optimal cutoff value was 10, which was the same as that of the original study with 85.9% sensitivity, 54.8% specificity, 91.2% PPV, and 41.6% NPV. Conclusion: The STONE and the modified STONE scores showed good diagnostic accuracy in high-risk groups of patients with suspected urinary stones. These scoring systems would be helpful to physicians in their diagnoses and in reducing radiation exposure.
Ga_(0.6)Sb_(1.4)Se₃單結晶의 光傳導度 特性
宋燦日,劉炳守,李愚宣,金南伍,金亨坤 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
Ga_(0.6)Sb_(l.4)Se₃single crystals were grown by the Bridgman technique method, These single crystals had orthorhombic structure, and lattice constant and electric conduction type of Ga_(0.6)Sb_(l.4)Se₃single crystals was a = 11.860Å , b = 12.057Å, c = 4.103Å and p-type, respectively. Direct band gap of Ga_(0.6)Sb_(l.4)Se₃single crystals obtained from optical absorption spectrum were 1.17 eV. Photoconductivity spectrum measured at 10K showed that the photoconductivity peak in Ga_(0.6)Sb_(l.4)Se₃single crystals was located in 960 nm.
송찬일,송상기,송각기 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
Automobile alternator noises are composed of mechanical noise, ventilation noise and magnetic noise. The design of magnetic parts, fans, bearing, and the rotor has an effect on these noises. In running automobile alternator, these elements can generate noises and vibrations. To know the noise sources of the various alternator, the characteristics of noises are analyzed as rotating speed is increased. Also, this study analyze the harmonics of the noise for the various alternators. The results of this study can lead the instruction t o the noise reduction on the automobile alternator.
송찬일,박홍주 대한평형의학회 2013 Research in Vestibular Science Vol.12 No.4
Benign paroxysmal positional vertigo (BPPV) is characterized by brief recurrent episodes of vertigo triggered by head positional changes. BPPV is one of the most common causes of recurrent vertigo. BPPV results from abnormal stimulation of the cupula within any of the three semicircular canals by free-floating otoliths (canalithiasis) or otoliths adhered to the cupula (cupulolithiasis). Spontaneous recovery occurs frequently even with conservative treatment. However, canalith repositioning maneuvers are believed to be the best way to treat BPPV by moving the canaliths from the semicircular canal to the vestibule. Various treatment methods of posterior,superior, and lateral canal BPPV are discussed in this review.
송찬일,송상기,송각기 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2
Automobile alternator noises are composed of mechanical noise, ventilation noise and magnetic noise. The design of magnetic parts, fans, bearing, and the rotor has an effect on these noises. In running automobile alternator, these elements can generate noises and vibrations. To know the noise sources of the various alternator, the characteristics of noises are analyzed as rotating speed is increased. Also, this study analyze the harmonics of the noise for the various alternators. The results of this study can lead the instruction to the noise reduction on the automobile alternator.
SMART100 표준설계인가 심사를 위한 사전 기술현황 검토
송찬이(Chanyi Song),이정재(Jungjae Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Korea Institute of Nuclear Safety (KINS) has initiated to review Standard Design Certification (SDC) of SMART100 (System-integrated Modular Advanced ReacTor) which was submitted by Korea Atomic Energy Research Institute (KAERI). This review is quite challenging because SMART100 is an integral small modular reactor (SMR) and adopts fully passive systems. So, KINS conducted the pre-application review and technical meetings to solve the safety issues and derive anticipated licensing issues for 10 months prior to SDC review. 18 items were discussed through the preapplication review. Also, KINS developed Regulatory Guides for passive safety systems.