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구조해석에 기반한 콘크리트 펌프 트럭의 동적 특성 분석
이현아(Hyunah Lee),한승오(Seungoh Han),이우균(Wookyun Lee),정민영(Minyoung Jung) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
Dynamic characteristics of boom structures in a concrete pump truck is analyzed. The enlargement of boom structure is essential part of concrete pump trucks in order to keep pace with high-rise construction trend. Thus, a large scaled boom structure including cylinders, links and so on, is the model to analyze. Dynamic analysis is performed under the most common positions like horizontal and arch positions. For the worst cases, rapid acceleration and deceleration is considered when the analysis is carried out. Dynamic loads profile is generated from multi-body dynamic analysis and those profile is applied as the external loads in dynamic structural analysis. Structural safety of the boom structure is confirmed from kinetic efforts.
Lee, Yookyung,Kim, Jongsoo,Kim, Seungoh,Kim, Jongbin The Korean Dental Society of Anesthsiology 2016 Journal of Dental Anesthesia and Pain Medicine Vol.16 No.1
Background: The most important reason for pre-operative administration of medication is to reduce anxiety. Alleviation of fear and anxiety about surgery enables patients to remain comfortable during treatment. Dexmedetomidine (DEX) is a fast-acting drug that is used as a premedication in different circumstances because it has sedative and anti-anxiolytic effects, and stable hemodynamics. It also has the advantage of intranasal administration. The aim of this study was to investigate the effects and hemodynamic stability of DEX by retrospectively analyzing cases in which DEX was administered nasally as a premedication. Methods: Ten patients treated at Dankook University Dental Hospital, recruited between February and April 2015, received intranasal delivery of $2{\mu}g/kg$ DEX, 30 minutes prior to general anesthesia. Anesthesia records of anxiety, blood pressure, respiration, pulse, estimated arterial oxygen saturation ($SpO_2$), and partial pressure, or maximum concentration, of carbon dioxide ($ETCO_2$) were analyzed. Results: Administration of DEX prior to a general anesthetic effectively relieved anxiety. Respiratory depression, the most severe adverse effect of other sedatives, was not observed. Hemodynamic stability under general anesthesia was maintained during treatment and a reduction in emergence delirium was observed upon completion of treatment. Conclusions: Premedication administration of DEX is safe for pediatric patients undergoing dental treatment under general anesthesia.
The use of laryngeal mask airway in dental treatment during sevoflurane deep sedation
Lee, Sangeun,Kim, Jongsoo,Kim, Jongbin,Kim, Seungoh The Korean Dental Society of Anesthsiology 2016 Journal of Dental Anesthesia and Pain Medicine Vol.16 No.1
Background: General anesthesia is frequently considered for pediatric patients, as they often find it difficult to cooperate and stay calm during administration of potentially painful treatments. Sedation can overcome these adversities; however, this is challenging while maintaining unobstructed airways. Methods: The study involved 11 pediatric dental patients treated with LMA under deep sedation with sevoflurane, from 2011 through 2015. LMA size, sevoflurane concentration, and the vital signs of patients were assessed through a chart review. Results: The age distribution of the patients ranged from 6 to 10 years old. A total of 3 patients underwent mesiodens extraction, while the remaining 8 underwent an surgically assisted orthodontic forced tooth eruption The average sedation period was approximately 45 minutes and the LMA size was $2\small{^1/_2}$. The sevoflurane concentration was maintained at 2% on average, and overall, the measurements of vital signs were within the normal range; the patients had an average blood pressure of 98/49 mmHg, breathing rate of 26 times/min, pulse frequency of 95 times/min, $SpO_2s$ level of 99 mmHg, and $ETCO_2$ level of 41.2 mmHg. Conclusions: Deep sedation with sevoflurane coupled with LMA may be applied successfully in pediatric patients who undergo mesiodens extraction or a surgically assisted orthodontic forced tooth eruption