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유사한 전자상태를 가지는 타이타늄 합금의 영률에 베타 안정화 원소 함량이 미치는 영향
유가영 ( Ga Young Yoo ),박찬희 ( Chan Hee Park ),홍재근 ( Jae Keun Hong ),김승언 ( Seong Eun Kim ),강남현 ( Seong Eun Kim ),염종택 ( Jong Taek Yeom ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.4
Previously, Gum Metal (Ti-24(Nb + Ta + V)-(Zr, Hf)-O (at%)) exhibiting an ultralow Young`s modulus, ultrahigh strength and super elasticity was developed by Saito et al., who proposed that three electronic magic numbers, an average electron/atom (e/a) ratio of 4.24, an average bond order (Bo) of about 2.87, and an average “d” electron-orbital energy level (Md) of about 2.45 eV, should be satisfied simultaneously to obtain such “super” properties. The purpose of this study was to find new alloy systems possessing those properties and to examine the effect of beta equivalent content ([Mo]eq) on Young`s moduli of new alloys having the same three electronic numbers mentioned above. It was found that not only three electronic numbers but also [Mo]eq should be considered to obtain a similar Young`s modulus and hardness with respect to the Gum Metal.
Ga Young Yoo,Seung Keun Yoon,Mi Hyoung Moon,Seok Whan Moon,Wonjung Hwang,Kyung Soo Kim The Korean Society for Thoracic and Cardiovascular 2024 Journal of Chest Surgery (J Chest Surg) Vol.57 No.3
Background: Unexpected conversion to thoracotomy during planned video-assisted thoracoscopic surgery (VATS) can lead to poor outcomes and comparatively high morbidity. This study was conducted to assess preoperative risk factors associated with unexpected thoracotomy conversion and to develop a risk scoring model for preoperative use, aimed at identifying patients with an elevated risk of conversion. Methods: A retrospective analysis was conducted of 1,506 patients who underwent surgical resection for non-small cell lung cancer. To evaluate the risk factors, univariate analysis and logistic regression were performed. A risk scoring model was established to predict unexpected thoracotomy conversion during VATS of the lung, based on preoperative factors. To validate the model, an additional cohort of 878 patients was analyzed. Results: Among the potentially significant clinical variables, male sex, previous ipsilateral lung surgery, preoperative detection of calcified lymph nodes, and clinical T stage were identified as independent risk factors for unplanned conversion to thoracotomy. A 6-point risk scoring model was developed to predict conversion based on the assessed risk, with patients categorized into 4 groups. The results indicated an area under the receiver operating characteristic curve of 0.747, with a sensitivity of 80.5%, specificity of 56.4%, positive predictive value of 1.8%, and negative predictive value of 91.0%. When applied to the validation cohort, the model exhibited good predictive accuracy. Conclusion: We successfully developed and validated a risk scoring model for preoperative use that can predict the likelihood of unplanned conversion to thoracotomy during VATS of the lung.
Ga Young Yoo,June Lee,Seok Beom Hong,Do Yeon Kim The Korean Society for Thoracic and Cardiovascular 2024 Journal of Chest Surgery (J Chest Surg) Vol.57 No.3
Venovenous extracorporeal membrane oxygenation (VV ECMO) is often used in cases of severe respiratory failure, especially in patients considered for lung transplantation. However, because many lung diseases can ultimately result in right heart failure, the treatment of secondary right heart failure can present a challenge when the patient is already under VV ECMO support. In such cases, an oxygenated-right ventricular assist device (OxyRVAD) can be used. OxyRVAD is designed to maintain anterograde blood flow and prevent right ventricular distension. Moreover, the pulmonary arterial cannula can be inserted percutaneously. We report a case in which percutaneous OxyRVAD was successfully implemented to manage right heart failure in a patient with respiratory failure who was on VV ECMO.
( Young Soo Lee ),( Ga Young Ban ),( Ji Hye Kim ),( Dae Hong Seo ),( Young Min Ye ),( Yoo Seob Shin ),( Dong Ho Nahm ),( Hae Sim Park ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Eosinophilic gastroenteritis (EG) is a rare disease characterized by massive eosinophilic infiltration of gastrointestinal tissue, increased peripheral eosinophilia and nonspecific gastrointestinal symptoms. EG have no known causes for eosinophilia such as drug, parasite, or malignancy. About 50% of EG patients have allergic diseases suggesting EG may be associated with allergic status since some EG patients exhibit elevated serum immunoglobulin E (IgE) levels. We report a case of EG which led to severe malabsorption and iron deficiency anemia associated with multiple food allergies. A 28-yearold Caucasian male patient visited emergency room complaining general weakness and leg swelling for 2 months. He had allergic rhinitis and vomiting whenever eating eggs, steaks, and salmons. He looked chronically-ill and conjunctivae were pale. In laboratory findings, hemoglobin level and WBC count were 6.4g/dL and 7,400/uL with 24.4% of eosinophil fraction as well as serum total protein and albumin levels were 3.9g/dL and 2.8g/dL, respectively. Serum iron level (12μg/dL), total iron binding capacity (247μg/ dL), and ferritin level (2.2μg/L) were all decreased. Serum eosinophil cationic protein level was increased (30.0μg/L) whereas serum total IgE level was within normal reference value (77KU/L). Serologic tests for parasite were all negative. Endoscopic studies were performed to exclude gastrointestinal bleeding and multiple nodular lesions were seen on gastric antrum with increased eosinophil in. ltration in lamina propria. High serum specific IgE levels to offending foods (beef: 0.82kU/L, pork: 0.83kU/L, egg white: 0.40kU/L, egg yolk: 0.54kU/L, and milk: 0.81kU/L) were noted. He was recommended avoiding offending foods with oral prednisolone therapy. Six months after food restriction, eosinophil count was 400/uL and hemoglobin level was restored to 11.5g/dL with 4.1g/dL of serum albumin level. We report a rare case of eosinophilic gastroenteritis associated with multiple food allergies.
Genetic Effects on Leukotriene Production in Aspirin Exacerbated Respiratory Disease
( Ga-young Ban ),( Kumsun Cho ),( Seung-hyun Kim ),( Moon Kyung Yoon ),( Ji-hye Kim ),( Yoo-seob Shin ),( Young-min Ye ),( Dong-ho Nahm ),( Hae-sim Park ) 대한내과학회 2015 대한내과학회 추계학술발표논문집 Vol.2015 No.1
Background: It is widely known that there have been strong genetic associations with aspirin exacerbated respiratory diseas (AERD) development. Leukotriene overproduction is the major feature of AERD. Genetic polymorphisms of CysLTR1 and HLA-DPB1*0301 were associated with the phenotypes of AERD. Objective: To investigate the genetic effects on leukotriene production in AERD. Subjects and Methods: A total of 95 AERD and 94 aspirin tolerant asthma (ATA) patients were enrolled. Serum samples were collected from all of the study subjects whereas urine samples were collected from 45 AERD and 44 ATA patients when the asthma was stable. The metabolites of LTE4 were analyzed using liquid chromatography with mass spectrometry. HLA-DPB1 high-resolution genotyping wasobtained from direct sequencing method and polymorphism of CysLTR1 was genotyped using SNaP shot ddNTP primer extension kit. Results: The frequency of HLA-DPB1*0301 allele was significantly higher in AERD compared with ATA (p=0.004, OR=4.178). The TT genotype frequency at CysLTR1 -634C>T is significantly higher in AERD compared to ATA (p 0.006, OR= 2.891). Serum and urine LTE4 levels were significantly higher in AERD than in ATA (19.10 ± 14.14 pg/mL vs. 13.59 ± 10.10 pg/mL, p=0.002; 7.36 ±13.19 pmol/mg creatinine vs. 2.69 ±3.62 pmol/mg creatinine, p=0.047, respectively). The levels of urine LTE4 were significantly higher in patients carrying HLA-DPB1*0301 (p=0.041), while no differences were found in serum LTE4. The asthmatic patients with the TTgenotype at -634C>T had a significantly higher levels of urine LTE4 (p=0.015), but no differences were found in serum LTE4 levels. The levels of urine LTE4 correlated significantly with fall of FEV1% after lysine aspirin bronchoprovocation test (r=0.463, p=0.008). Conclusions: HLA-DPB1*0301 and genetic polymorphisms of CysLTR1 -634C>T affect cysteinyl leukotriene overproduction which can contribute to develop the phenotypes of AERD.
Clinical features of elderly chronic urticaria
( Ga Young Ban ),( Mi Yea Kim ),( Hye Soo Yoo ),( Dong Ho Nahm ),( Young Min Ye ),( Yoo Seob Shin ),( Hae Sim Park ) 대한내과학회 2014 The Korean Journal of Internal Medicine Vol.29 No.6
Background/Aims: Chronic urticaria (CU) is defined as itchy wheals lasting 6 weeks or more. As the aged population increases worldwide, it is essential to identify the specific features of this disease in the elderly population. Methods: We investigated the prevalence and clinical features of CU in elderly patients. Medical records of 837 CU patients from the outpatient Allergy Clinic of Ajou University Hospital, Korea were analyzed retrospectively. Patients with chronic spontaneous urticaria according to the EAACI/GA2LEN/EDF/WAO guidelines were included. Patients older than 60 years were defined as elderly. Results: Of the 837 patients, 37 (4.5%) were elderly. In elderly versus nonelderly CU patients, the prevalence of atopic dermatitis (AD) was significantly higher (37.8% vs. 21.7%, respectively; p = 0.022), while that of aspirin intolerance was lower (18.9% vs. 43.6%, respectively; p = 0.003) in terms of comorbid conditions. The prevalences of serum specific immunoglobulin E antibodies to staphylococcal enterotoxin A and staphylococcal enterotoxin B were considerably higher in elderly CU patients with AD than in those without AD (37.5% vs. 0%, respectively). Conclusions: Elderly patients with CU had a higher prevalence of AD. Therefore, there is a need to recognize the existence of AD in elderly CU patients.
Clinical features of elderly chronic urticaria
( Ga Young Ban ),( Mi Yea Kim ),( Hye Soo Yoo ),( Dong Ho Nahm ),( Young Min Ye ),( Yoo Seob Shin ),( Hae Sim Park ) 대한내과학회 2013 대한내과학회 추계학술발표논문집 Vol.2013 No.1
Background: Chronic urticaria (CU) is defined as itchy wheals lasting for at least 6 weeks, with or without angioedema. It is a common disabling disorder occurring in about 0.5-1% of the population. Recently, the aged population is increasing worldwide, and this group responds differently to environmental stimuli. Therefore, it is essential to identify the specific features of disease in aged group. Nevertheless, there have been few studies reporting the features about CU in the elderly population. We investigated the prevalence and clinical features of elderly CU in comparison with non-elderly CU in this country. Method: We retrospectively analyzed the medical records of 827 CU patients who were followed in the outpatient Allergy Clinic of Ajou University Hospital, South Korea. According to the EAACI/GA2LEN/EDF/WAO guideline, physical or other secondary types of urticarial patients were excluded, and chronic spontaneous urticarial patients were included. Elderly CU was defined as the CU patients older than 60 years old. Severe CU was defined when urticaria activity score was ≥13 at initial visit. Results: Of the total 827 patients, 37 (4.5%) were elderly. Among co-morbid conditions, atopic dermatitis (AD) was significantly higher (37.8% vs. 21.7%, p=0.022), while prevalence of aspirin intolerance was lower (18.9% vs. 43.6%, p=0.003) in elderly CU. However, prevalence of severe CU was not significantly different between the two groups. Other clinical parameters such as sex, atopy and laboratory findings including anti-thyroid antibodies and serum specific IgE to staphylococcal superantigens were found to have no significant differences between the two groups. However the prevalences of serum specific IgE to staphylococcal enterotoxin A (SEA) and staphylococcal enterotoxin B (SEB) were significantly higher in elderly CU with AD than in those without AD (37.5% vs. 0%, respectively). Conclusion: Considering the higher prevalence of AD in elderly CU, it is needed to observe the coexistence of AD in elderly CU. Specific IgE to SEA/SEB may play a role in the pathogenesis of elderly CU, especially who are accompanied by AD.