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Delayed Obstruction of Endotracheal Tube by Previously Aspirated Foreign Body: A Case Report
Sungsik Chon,Jinho Kim,Shin Ok Koh,Jung Goo Cho,In Soon Hwang,In Seon Jin Korean Society of Critical Care Medicine 2005 Acute and Critical Care Vol.20 No.2
Acute airway obstruction during endotracheal intubation status is embarrassing and critical situation which requires early diagnosis and immediate management. Endotracheal tube obstruction with foreign body is rare but a variety of objects have been reported. We present a case of endotracheal tube obstruction as a result of previous aspirated foreign body that moved from the bronchial tree into the endobroncheal tube.
1.5 V Sub-mW CMOS Interface Circuit for Capacitive Sensor Applications in Ubiquitous Sensor Networks
Sungsik Lee,Ahra Lee,Chang-Han Je,Myung-Lae Lee,Gunn Hwang,Chang-Auck Choi 한국전자통신연구원 2008 ETRI Journal Vol.30 No.5
In this paper, a low-power CMOS interface circuit is designed and demonstrated for capacitive sensor applications, which is implemented using a standard 0.35-μm CMOS logic technology. To achieve low-power performance, the low-voltage capacitance-to-pulse-width converter based on a self-reset operation at a supply voltage of 1.5 V is designed and incorporated into a new interface circuit. Moreover, the external pulse signal for the reset operation is made unnecessary by the employment of the self-reset operation. At a low supply voltage of 1.5 V, the new circuit requires a total power consumption of 0.47 mW with ultra-low power dissipation of 157 μW of the interfacecircuit core. These results demonstrate that the new interface circuit with self-reset operation successfully reduces power consumption. In addition, a prototype wireless sensor-module with the proposed circuit is successfully implemented for practical applications. Consequently, the new CMOS interface circuit can be used for the sensor applications in ubiquitous sensor networks, where low-power performance is essential.
스파크점화직분식 CNG의 점화성 및 연소화염 특성에 대한 연구
황성일 ( Seongill Hwang ),정성식 ( Sungsik Chung ),염정국 ( Jeongkuk Yeom ),전병열 ( Byongyeul Jeon ),이진현 ( Jinhyun Lee ) 한국분무공학회 2016 한국액체미립화학회지 Vol.21 No.1
For the SI engines, at only full load, the pumping loss has a negligible effect, while at part load conditions, the pumping loss increases. To avoid the pumping loss, the spark-ignited engines are designed to inject gasoline directly into the combustion chamber. In the spark-ignited direct-injection engines, ignition probability is important for successful combustion and the flame propagation characteristics are also different from that of pre-mixed combustion. In this paper, a visualization experiment system is designed to study the ignition probability and combustion flame characteristics of spark-ignited directinjection CNG fuel. The visualization system is composed of a combustion chamber, fuel supply system, air supply system, electronic control system and data acquisition system. It is found that ambient pressure, ambient temperature and ambient air flow velocity are important parameters which affect the ignition probability of CNG-air mixture and flame propagation characteristics and the injected CNG fuel can be ignited directly by a spark-plug under proper ambient conditions. For all cases of successful ignition, the flame propagation images were digitally recorded with an intensified CCD camera and the flame propagation characteristics were analyzed.
( Young In Lee ),( Jihee Kim ),( Shinwon Hwang ),( Sungsik Shin ),( Jung U Shin ),( Ju Hee Lee ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2
Background: Although studies confirmed the therapeutic effect of low-fluence Q-switched Nd:YAG laser and topical lightening agents, some types of facial pigmentations are still resistant to the current standard treatments. Objectives: To analyze the effect of micro-pulsed RF device on the treatment of refractory melasma and PIH Methods: The photographs of 10 patients who visited our dermatology clinic for the treatments of refractory melasma and PIH were retrospectively reviewed. The average number of treatments with micro-pulsed RF device (Sylfirm, SLR Inc., CA, USA) added to their existing treatments was 4 sessions, during the mean follow-up period of 19 weeks. The skin lesions were evaluated according to Investigator Global Assessments (IGA), and the patient-reported side effects were reviewed. Results: The refractory facial pigmentations after the additional treatments with micro-pulsed RF device were notably reduced in most patients. The IGA showed an average of more than 50% improvement from conventional treatments. Out of 10 patients, only 1 patient reported itching, which was mild and treated well with moderate-potency topical steroid. Another patient reported a persistent erythema on both cheeks after the 1st laser treatment, which spontaneously subsided on the next 4-week follow-up visit. Conclusion: The combination of micro-pulsed RF laser on the conventional therapy showed additional improvement in refractory melasma and PIH patients.