• Title/Summary/Keyword: Initial center

Search Result 3,380, Processing Time 0.042 seconds

Association between prehospital i-gel insertion and PCO2 in patients with out-of-hospital cardiac arrest

  • Cho, Eunsom;Cho, Eun-Hye;Kim, Hyuk-Hoon;Choi, Sang-Cheon;Min, Young-Gi;Kang, So Young;Chae, Minjung Kathy
    • Journal of The Korean Society of Emergency Medicine
    • /
    • v.29 no.6
    • /
    • pp.578-584
    • /
    • 2018
  • Objective: This study examined the initial partial pressure of carbon dioxide ($PCO_2$) as a possible indicator of prehospital ventilation and its association with prehospital i-gel in out-of-hospital cardiac arrest (OHCA) patients. Methods: The demographics and arrest parameters, including i-gel insertion and initial arterial blood gas analysis, of OHCA patients who visited the emergency department were analyzed retrospectively. Linear regression analysis was performed to examine the association between i-gel insertion and the initial $PCO_2$. Results: A total of 106 patients were investigated. Fifty-six patients had prehospital i-gel insertion and 50 patients did not have a prehospital advanced airway. The initial $PCO_2$ was higher in the i-gel group than the no advanced airway group (105.2 mmHg [77.5-134.9] vs. 87.5 mmHg [56.8-115.3], P=0.03). Prehospital i-gel insertion was associated with a higher initial $PCO_2$ level (${\beta}$ coefficient, 20.3; 95% confidence interval, 2.6-37.9; P=0.03). Conclusion: Prehospital insertion of i-gel was associated with higher initial $PCO_2$ values in OHCA patients compared to no advanced airway.

Fast Video Motion Estimation Algorithm Based on Motion Speed and Multiple Initial Center Points Prediction (모션 속도와 다중 초기 중심점 예측에 기반한 빠른 비디오 모션 추정 알고리즘)

  • Peng, Sha-Hu;Saipullah, Khairul Muzzammil;Yun, Byung-Choon;Kim, Deok-Hwan
    • Journal of KIISE:Computing Practices and Letters
    • /
    • v.16 no.12
    • /
    • pp.1219-1223
    • /
    • 2010
  • This paper proposes a fast motion estimation algorithm based on motion speed and multiple initial center points. The proposed method predicts initial search points by means of the spatio-temporal neighboring motion vectors. A dynamic search pattern based on the motion speed and the predicted initial center points is proposed to quickly obtain the motion vector. Due to the usage of the spatio-temporal information and the dynamic search pattern, the proposed method greatly accelerates the search speed while keeping a good predicted image quality. Experimental results show that the proposed method has a good predicted image quality in terms of PSNR with less searching time comparing with the Full Search, New Three-Step Search, and Four-Step Search.

Axial behavior of RC column strengthened with SM-CFST

  • Jiang, Haibo;Li, Jiahang;Cheng, Quan;Xiao, Jie;Chen, Zhenkan
    • Steel and Composite Structures
    • /
    • v.43 no.6
    • /
    • pp.773-784
    • /
    • 2022
  • This paper aims to investigate the axial compressive behavior of reinforced concrete (RC) columns strengthened with self-compacting and micro-expanding (SM) concrete-filled steel tubes (SM-CFSTs). Nine specimens were tested in total under the local axial compression. The test parameters included steel tube thickness, filling concrete strength, filling concrete type and initial axial preloading. The test results demonstrated that the initial stiffness, ultimate bearing capacity and ductility of original RC columns were improved after being strengthened by SM-CFSTs. The ultimate bearing capacity of the SM-CFST strengthened RC columns was significantly enhanced with the increase of steel tube thickness. The initial stiffness and ultimate bearing capacity of the SM-CFST strengthened RC columns were slightly enhanced with the increase of filling concrete strength. However, the effect of filling concrete type and initial axial preloading of the SM-CFST strengthened RC columns were negligible. Three equations for predicting the ultimate bearing capacity of the SM-CFST strengthened RC columns were compared, and the modified equation based on Chinese code (GB 50936-2014) was more precise.

Postoperative Complications and Their Risk Factors of Completion Total Gastrectomy for Remnant Gastric Cancer Following an Initial Gastrectomy for Cancer

  • Park, Sin Hye;Eom, Sang Soo;Eom, Bang Wool;Yoon, Hong Man;Kim, Young-Woo;Ryu, Keun Won
    • Journal of Gastric Cancer
    • /
    • v.22 no.3
    • /
    • pp.210-219
    • /
    • 2022
  • Purpose: Completion total gastrectomy (CTG) for remnant gastric cancer (RGC) is a technically demanding procedure and associated with increased morbidity. The present study aimed to evaluate postoperative complications and their risk factors following surgery for RGC after initial partial gastrectomy due to gastric cancer excluding peptic ulcer. Materials and Methods: We retrospectively reviewed the data of 107 patients who had previously undergone an initial gastric cancer surgery and subsequently underwent CTG for RGC between March 2002 and December 2020. The postoperative complications were graded using the Clavien-Dindo classification. Logistic regression analyses were used to determine the risk factors for complications. Results: Postoperative complications occurred in 34.6% (37/107) of the patients. Intra-abdominal abscess was the most common complication. The significant risk factors for overall complications were multi-visceral resections, longer operation time, and high estimated blood loss in the univariate analysis. The independent risk factors were multi-visceral resection (odds ratio [OR], 2.832; 95% confidence interval [CI], 1.094-7.333; P=0.032) and longer operation time (OR, 1.005; 95% CI, 1.001-1.011; P=0.036) in the multivariate analysis. Previous reconstruction type, minimally invasive approach, and current stage were not associated with the overall complications. Conclusions: Multi-visceral resection and long operation time were significant risk factors for the occurrence of complications following CTG rather than the RGC stage or surgical approach. When multi-visceral resection is required, a more meticulous surgical procedure is warranted to improve the postoperative complications during CTG for RGC after an initial gastric cancer surgery.

Changes of Germination Rate of Rice Seeds with Variable Status after 10-years of Storage Period

  • Young-yi Lee;Jae-young Song;Jinjoo Bae;Jung-ro Lee;Munsup Yoon
    • Proceedings of the Plant Resources Society of Korea Conference
    • /
    • 2021.04a
    • /
    • pp.38-38
    • /
    • 2021
  • The seeds of rice with variable status were examined the germination rate after 10 years of long-term storage (-18℃) conservation. For seeds of wild relatives, 2 accessions were examined and germination rate of all accessions showed no changed after freezing conservation. For seeds of native germplasm, 1,259 accessions were examined and germination rate of 696 accessions was increased or showed no change after 10 years of long-term storage. Germination rate of 432 accessions was decreased with below 15% of initial germination rate. For 79 accessions of native germplasm, germination rate of seeds was decreased with above 15% of initial germination rate after 10 years of long-term storage, which is needed to be rejuvenated. For seeds of developed varieties, 873 accessions were examined and germination rate of 486 accessions of developed varieties was increased or showed no change after 10 years of long-term storage. Germination rate of 251 accessions was decreased with below 15% of initial germination rate. For 25 accessions of developed varieties, germination rate of seeds was decreased with above 15% of initial germination rate after 10 years of long-term storage, which is needed to be rejuvenated. For seeds of developed line, 2,131 accessions were examined and germination rate of 1,245 accessions of developed line was increased or showed no change after 10 years of long-term storage. Germination rate of 588 accessions was decreased with below 15% of initial germination rate. For 96 accessions, germination rate of seeds was decreased with above 15% of initial germination rate, which is needed to be rejuvenated.

  • PDF

Initial Pole Position Estimation of Surface PM-LSM

  • Kim, Tae-Woong;Junichi Watanabe;Sumitoshi Sonoda;Junji Hirai
    • Journal of Power Electronics
    • /
    • v.1 no.1
    • /
    • pp.1-8
    • /
    • 2001
  • The elimination of a pole sensor is desirable due to the low-cost requirement, the compactness, and the applied drives. This paper proposes the algorithm for the initial pole-position estimation of a surface permanent magnet linear synchronous motor (PM-LSM), which is carried out under the closed loop control without a pole sensor and is insensitive to the motor parameters. This algorithm is based on the principle that the initial pole position (IPP) is estimated by the trigonometric function of the two reference currents. The effectiveness of the proposed algorithm is confirmed by testing a surface PM-LSM with large disturbance, which result shows that IPP is well estimated within a satisfied moving-distance and a shorter estimation taken-time even if large disturbance such as cogging and friction is existed.

  • PDF

Fast Motion Estimation Based on Motion Speed and Multiple Initial Center Point Prediction (모션 속도와 다양한 초기의 중앙점 예측에 기반한 빠른 비디오 모션 추정)

  • Peng, Shao-Hu;Saipullah, Khairul Muzzammil;Yun, Byung-Choon;Kim, Deok-Hwan
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2010.06a
    • /
    • pp.246-247
    • /
    • 2010
  • This paper proposes a fast motion estimation algorithm based on motion speed and multiple initial center points. The proposed method predicts initial search points by means of the spatio-temporal neighboring motion vectors. A dynamic search pattern based on motion speed and the predicted initial center points is proposed to quickly obtain the motion vector. Due to the usage of the spatio-temporal information and the dynamic search pattern, the proposed method greatly accelerates the search speed while maintaining a good predicted image quality. Experimental results show that the proposed method has a good predicted image quality in terms of PSNR with less search time as compared to the Full Search, New Three-Step Search, and Four-Step Search.

  • PDF

Transmission Error Influences by Initial Tension of Timing Chain System (타이밍 체인 시스템의 초기 장력이 전달 오차에 미치는 영향)

  • Park, Yongsik;Jung, Taeksu;Hong, Yunhwa;Kim, Youngjin;Park, Youngkyun;Lee, Jungjin;Cho, Chongdu
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.25 no.2
    • /
    • pp.133-139
    • /
    • 2017
  • The timing chain system, which is a typical power transmission technology applied to a vehicle, has been widely used by the automotive industry because it is normally designed to last a car's lifetime. However, the timing chain system may cause some problems due to the shape of the chains and the polygonal behavior on contact between the chain and the sprocket. In addition, noise and vibration caused by transmission error are the most typical problems encountered by major automotive manufacturers and they are considered as the main source of customer complaint. The initial tension of the chain-sprocket system is thought to be the main cause of transmission error, and it is regarded as the source of engine vibration and noise. The initial tension of the chain system should be controlled carefully since a low initial tension can cause twisting, which may lead to a system malfunction, while a high initial tension can reduce the service life due to a worn down contact surface. In this paper, the kinematic analysis model is generated with various initial tensions, which are controlled by changing the shape of the fixed guide with the largest contact surface with chain. The results showed that the transmission error was minimized on a particular range of initial tension, and the tendency showed that the error changed with a higher sensitivity at a lower initial tension.

Desmoplastic melanoma of the oral cavity: diagnostic pitfalls and clinical characteristics

  • Min, Seung-Ki;Jeong, Joo Hee;Ahn, Kang-Min;Yoo, Chong Woo;Park, Joo Yong;Choi, Sung Weon
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
    • /
    • v.44 no.2
    • /
    • pp.66-72
    • /
    • 2018
  • Objectives: Desmoplastic melanoma of the oral cavity is an extremely rare condition that is often confused on initial diagnosis with non-melanotic benign lesion or spindle cell tumors. The purpose of this article was to raise awareness of the disease using a literature review. Materials and Methods: We analyzed 19 desmoplastic melanoma cases reported in the literature and added our experience. Data on clinical, histopathology, treatment, and survival were retrieved and analyzed. Survival analysis was by the Kaplan-Meier method. Results: Initial clinical and histopathological features were indistinctive, and a definite diagnosis of desmoplastic melanoma at initial assessment was possible in only 23.5% of cases. Among tests, immunohistochemical studies for S-100 and vimentin were all positive. The 5-year disease-free survival rate for oral desmoplastic melanoma was 0%, and the 5-year overall survival rate was 55.0%. Conclusion: Oral desmoplastic melanoma has a high percentage of initial misdiagnosis and propensity for local recurrence. Thus, careful initial diagnosis and adequate surgery may result in improved overall survival.