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헬리콥터 비행 시뮬레이터와 실 비행훈련과의 효과 분석: 계기비행 훈련을 중심으로
김상철,김종민,Kim, Sang-chul,Kim, Jong-min 한국항공운항학회 2020 한국항공운항학회지 Vol.28 No.1
To compare and analyze the differences between flight simulation and actual flight among 130 army helicopter pilot training subjects, the correlation analysis was performed first through t-testing and multiple regression analysis of individual characteristics and flight simulation and actual instrument flight training, which were analyzed significantly in the age (a3) and service classification (a5) of the six verification factors. This has been shown to be significant, with no difference between the flight simulator and the actual flight. Second, in order to study the correlation between aircraft types, the flight evaluation (v1) was analyzed as a dependent variable for the performance of the flight simulator (KUH: s2, UH60: s3, AH-1S: s5, UH-1H: s6), and the results of the multiple regression analysis of the flight simulator evaluation (s1) were analyzed, in contrast, as a dependent variable, and in conclusion, the training of the flight simulator provided statistical data on the possibility of replacing the actual flight training, which is thought to contribute to the orientation, budget reduction and aviation safety of the pilot training.
Relationship between Study Skills and Conceptions of Intelligence for Postsecondary Students
K. Kovach,L. Wilgosh,L. Stewin 대한사고개발학회 1999 The International Journal of Creativity & Problem Vol.9 No.2
This study was designed to investigate the relationship between study skills and attitudes toward intelligence in undergraduate university students. In that respect, it replicates a similar study by Jones, Slate, Marini, and DeWater (1993), which found a relationship between the variables such that general education undergraduate students with an entity view of intelligence had weaker study skills, exerting less study effort, than did similar students with an incremental view of intelligence. The present findings generally supported the earlier Jones et al. research, demonstrating the replicability of the Jones et al. findings cross-nationally. The authors raised, for further consideration, questions about feasibility of altering adults ' entity views of intelligence toward an incremental view, about the effectiveness of study skills interventions with those who hold an entity view of intelligence, and about further cross-cultural research to assess the range of appli-cability of the research and theoretical framework.
( Sang Ho Lee,Louis E . Kovach,Judith B . Carberry ) 한국물환경학회 1993 한국물환경학회지 Vol.9 No.3
A selected microbial consortium(SMC), using pentachlorophenol(PCP) as a sole carbon source was developed. For systems of nonpretreated and fungally or chemically pretreated PCP, the resulting growth rates were determined and compared. Pretreatment was accomplished using the white-rot fungus Phanerochaete chrysosporium or Fenton`s Reagent. Growth rate kinetics were described by the Haldane Model. Haldane constants were used as the basis of comparison. Results indicate that both fungal and chemical pretreatment effected a significant decrease in toxicity when compared with nonpretreated systems. In addition, fungal pretreatment decreased PCP toxicity to a greater extent than did chemical pretreatment at the chemical doses investigated for this study. At PCP concentrations above 47㎎/ℓ, for the fungal pretreatment system, at PCP concentration above 29㎎/ℓ, for the chemical pretreatment system, toxicity gradually increased. Possible mechanisms for these results are explained using cometabolism.
The Impact of Perforator Number on Deep Inferior Epigastric Perforator Flap Breast Reconstruction
Ritwik Grover,Jonas A Nelson,John P Fischer,Stephen J Kovach,Joseph M Serletti,Liza C Wu 대한성형외과학회 2014 Archives of Plastic Surgery Vol.41 No.1
Background: Perforator flaps minimize abdominal site morbidity during autologous breast reconstruction. The purpose of this study was to assess whether the number of perforators harvested influences the overall deep inferior epigastric perforator (DIEP) flap survival and flap-related complications. Methods: A retrospective review was performed of all DIEP flaps performed at the Hospital of the University of Pennsylvania from 2006 to 2011. The outcomes assessed included flap loss and major complications. We compared flaps by the number of total perforators (1–4) and then carried out a subgroup analysis comparing flaps with one perforator to flaps with multiple perforators. Lastly, we conducted a post-hoc analysis based on body mass index (BMI) categorization. Results: Three hundred thirty-three patients underwent 395 DIEP flaps. No significant differences were noted in the flap loss rate or the overall complications across perforator groups. However, the subgroup analysis revealed significantly higher rates of fat necrosis in the case of one-perforator flaps than in the case of multiple-perforator flaps (10.2% vs. 3.1%, P=0.009). The post-hoc analysis revealed a significant increase in the flap loss rate with increasing BMI (<30=2.0%, 30–34.9=3.1%, 35–39.9=3.1%, >40=42.9%, P<0.001) in the DIEP flaps, but no increase in fat necrosis. Conclusions: This study demonstrates that the number of perforators does not impact the rate of flap survival. However, the rate of fat necrosis may be significantly higher in DIEP flaps based on a single perforator. Multiple perforators should be utilized if possible to decrease the risk of fat necrosis.
The Impact of Perforator Number on Deep Inferior Epigastric Perforator Flap Breast Reconstruction
Grover, Ritwik,Nelson, Jonas A.,Fischer, John P.,Kovach, Stephen J.,Serletti, Joseph M.,Wu, Liza C. Korean Society of Plastic and Reconstructive Surge 2014 Archives of Plastic Surgery Vol.41 No.1
Background Perforator flaps minimize abdominal site morbidity during autologous breast reconstruction. The purpose of this study was to assess whether the number of perforators harvested influences the overall deep inferior epigastric perforator (DIEP) flap survival and flap-related complications. Methods A retrospective review was performed of all DIEP flaps performed at the Hospital of the University of Pennsylvania from 2006 to 2011. The outcomes assessed included flap loss and major complications. We compared flaps by the number of total perforators (1-4) and then carried out a subgroup analysis comparing flaps with one perforator to flaps with multiple perforators. Lastly, we conducted a post-hoc analysis based on body mass index (BMI) categorization. Results Three hundred thirty-three patients underwent 395 DIEP flaps. No significant differences were noted in the flap loss rate or the overall complications across perforator groups. However, the subgroup analysis revealed significantly higher rates of fat necrosis in the case of one-perforator flaps than in the case of multiple-perforator flaps (10.2% vs. 3.1%, P=0.009). The post-hoc analysis revealed a significant increase in the flap loss rate with increasing BMI (<30=2.0%, 30-34.9=3.1%, 35-39.9=3.1%, >40=42.9%, P<0.001) in the DIEP flaps, but no increase in fat necrosis. Conclusions This study demonstrates that the number of perforators does not impact the rate of flap survival. However, the rate of fat necrosis may be significantly higher in DIEP flaps based on a single perforator. Multiple perforators should be utilized if possible to decrease the risk of fat necrosis.
Complex oncologic resection and reconstruction of the scalp: Predictors of morbidity and mortality
Tecce, Michael G.,Othman, Sammy,Mauch, Jaclyn T.,Nathan, Shelby,Tilahun, Estifanos,Broach, Robyn B.,Azoury, Said C.,Kovach, Stephen J. Korean Cleft Palate-Craniofacial Association 2020 Archives of Craniofacial Surgery Vol.21 No.4
Background: Oncologic resection of the scalp confers several obstacles to the reconstructive surgeon dependent upon patient-specific and wound-specific factors. We aim to describe our experiences with various reconstructive methods, and delineate risk factors for coverage failure and complications in the setting of scalp reconstruction. Methods: A retrospective chart review was conducted, examining patients who underwent resection of fungating scalp tumors with subsequent soft-tissue reconstruction from 2003 to 2019. Patient demographics, wound and oncologic characteristics, treatment modalities, and outcomes were recorded and analyzed. Results: A total of 189 patients were appropriate for inclusion, undergoing a range of reconstructive methods from skin grafting to free flaps. Thirty-three patients (17.5%) underwent preoperative radiation. In all, 48 patients (25.4%) suffered wound site complications, 25 (13.2%) underwent reoperation, and 47 (24.9%) suffered from mortality. Preoperative radiation therapy was an independent risk factor for wound complications (odds ratio [OR], 2.85; 95% confidence interval [CI], 1.1-7.3; p=0.028) and reoperations (OR, 4.45; 95% CI, 1.5-13.2; p=0.007). Similarly, the presence of an underlying titanium mesh was an independent predictor of wound complications (OR, 2.49; 95% CI, 1.1-5.6; p=0.029) and reoperations (OR, 3.40; 95% CI, 1.2-9.7; p=0.020). Both immunosuppressed status (OR, 2.88; 95% CI, 1.2-7.1; p=0.021) and preoperative radiation therapy (OR, 3.34; 95% CI, 1.2-9.7; p=0.022) were risk factors for mortality. Conclusion: Both preoperative radiation and the presence of underlying titanium mesh are independent risk factors for wound site complications and increased reoperation rates following oncologic resection and reconstruction of the scalp. Additionally, preoperative radiation, along with an immunosuppressed state, may predict patient mortality following scalp resection and reconstruction.