http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
송찬일,김창석,정천옥,김병인 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
In this study, the evaporation of SiO layers with different thickness on Si wafer(n-100) is conducted by using the RF sputtering method. Thin films are made with the structure of Si/SiO and Si/SiO/TiN by evaporating TIN which is used as a diffusion barrier of non-resistant superintegrated semiconductor circuit. The research is performed to increase the I-V characteristics depending upon the SiO thickness and the reliability and reproducibility of the TIN thin film. It is shown that, since the TIN is diffused into SiO surface and fosters the potential barrier highly in the SiO/TiN thin film, the saturation voltage appears after the SiO thin film does. The thicker the SiO film becomes, the weaker the current variation does and the less leakage current the TiN deposited thin film has. The leakage current variation with a little slope is found in the negative voltage zone due to the effect of the trap state density near the electrode. The spiking which occurs when the film is too very thin can be reduced by adding TiN. The stability can be obtained due to no pervasion of A1 into SiO. The experimental result matches the Ohm s law and satisfies the equation of current.
2차측 능동크램프 방식의 영전압 영전류 스위칭 풀브리지 DC-DC 컨버터
송찬일,이상일,김병철 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2
The zero voltage switching(ZVS) full-bridge(FB) PWM dc-dc converter is characterized by high efficiency, low switching stress and simple topology. But because of primary current in the circulating period, conducting loss of the lagging leg device occur. In this paper, a novel zero voltage and zero current switching(ZVZCS) FB Phase-Shift(PS) PWM dc-dc converter was proposed. The converter has secondary auxiliary circuit using R, L, D. The proposed secondary auxiliary circuit is simple and lossless but removes the primary current for circulating period effectively. The 50 kHz, 300 W prototype converter was experimented for verification of the converter characteristics. The proposed converter has good Characteristics of ZVZCS and high efficiency of 91%.
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 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
This paper presents the obtained ecperimental results of a research program aimed to study corona on rough surfaces. This paper models the interaction between positive coronas using sewing needles attached to a thick conductor of smooth surface. The experimental research is focused on stundying of discharge ; namely the onset and offset voltages of the pulse mode. The obtained results will be analysed and the transition from burst pulses to continuous glow in labolatory air is discussed.
SF_(6)의 Impulse 破壞電壓-時間特性에 對한 硏究
宋燦日 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
In this paper the impulse breakdown voltage-time characteristics of coaxial cylinder gaps in SF_(6) are experimentally and theoretically investigated. The factors influencing the voltage-time curve that are systematically studied in this paper include the nature and pressure of the gas and the polarity of the impulse applied to the high voltage electrode. The breakdown time delay probability is treated as a bivariate distribution in statical and formative time lags. A systematic method is developed to relate the statistics of breakdown delays in SF_(6) with their breakdown voltage-probability.
송찬이,임지용,오상훈,김효준 대한응급의학회 2022 大韓應急醫學會誌 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.
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.