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Detecting hepatitis B virus in surgical smoke emitted during laparoscopic surgery
Kwak, Han Deok,Kim, Seon-Hahn,Seo, Yeon Seok,Song, Ki-Joon BMJ Publishing Group Ltd 2016 Occupational and environmental medicine Vol.73 No.12
<P>Conclusions HBV is detectable in surgical smoke. This study provides preliminary data in the investigation of airborne HBV infection.</P>
Texture, Morphology and Photovoltaic Characteristics of Nanoporous F:SnO<sub>2</sub> Films
Han, Deok-Woo,Heo, Jong-Hyun,Kwak, Dong-Joo,Han, Chi-Hwan,Sung, Youl-Moon The Korean Institute of Electrical Engineers 2009 Journal of Electrical Engineering & Technology Vol.4 No.1
The nanoporous $F:SnO_2$ materials have been prepared through the controlled hydrolysis of fluoro(2-methylbutan-2-oxy)di(pentan-2,4-dionato)tin followed by thermal treatment at $400-550^{\circ}C$. The main IR features include resonances at 660, 620 and 540 cm-1. From the TG-DTG result, three main mass losses of 6.5, 13.3 and 3.8 at 81, 289 and $490^{\circ}C$ are observed between 50 and $650^{\circ}C$ yielding a final residue of 76.0%. The size of Sn $O_2$ nanoparticles rose from 5 nm to 10-12 nm as the temperature of thermal treatment is increased from 400 to $550^{\circ}C$.
Texture, Morphology and Photovoltaic Characteristics of Nanoporous F:SnO₂ Films
Deok-Woo Han,Jong-Hyun Heo,Dong-Joo Kwak,Chi-Hwan Han,Youl-Moon Sung 대한전기학회 2009 Journal of Electrical Engineering & Technology Vol.4 No.1
The nanoporous F:SnO₂ materials have been prepared through the controlled hydrolysis of fluoro(2-methylbutan-2-oxy)di(pentan-2,4-dionato)tin followed by thermal treatment at 400-550℃. The main IR features include resonances at 660, 620 and 540 ㎝-1. From the TG-DTG result, three main mass losses of 6.5, 13.3 and 3.8 at 81, 289 and 490℃ are observed between 50 and 650℃ yielding a final residue of 76.0%. The size of Sn O2 nanoparticles rose from 5 ㎚ to 10-12 ㎚ as the temperature of thermal treatment is increased from 400 to 550℃.
Han Deok Kwak,Jae Kyun Ju 대한외과학회 2020 Annals of Surgical Treatment and Research(ASRT) Vol.98 No.3
Purpose: Appendiceal tumoral lesions can occur as benign, malignant, or borderline disease. Determination of the extent of surgery through accurate diagnosis is important in these tumoral lesions. In this study, we assessed the accuracy of preoperative CT and identified the factors affecting diagnosis. Methods: Patients diagnosed or strongly suspected from July 2016 to June 2019 with appendiceal mucocele or mucinous neoplasm using abdominal CT were included in the study. All the patients underwent single-incision laparoscopic cecectomy with the margin of cecum secured at least 2 cm from the appendiceal base. To compare blood test results and CT findings, the patients were divided into a mucinous and a nonmucinous group according to pathology. Results: The total number of patients included in this study was 54 and biopsy confirmed appendiceal mucinous neoplasms in 39 of them. With CT, the accuracy of diagnosis was 89.7%. The mean age of the mucinous group was greater than that of the nonmucinous group (P = 0.035). CT showed that the maximum diameter of appendiceal tumor in the mucinous group was greater than that in the nonmucinous group (P < 0.001). Calcification was found only in the appendix of patients in the mucinous group (P = 0.012). Multivariate analysis revealed that lager tumor diameter was a factor of diagnosis for appendiceal mucinous neoplasm. Conclusion: The accuracy of preoperative diagnosis of appendiceal mucinous neoplasms in this study was 89.7%. Blood test results did not provide differential diagnosis, and the larger the diameter of appendiceal tumor on CT, the more accurate the diagnosis
Is radical surgery for clinical stage I right-sided colon cancer relevant? A retrospective review
Han Deok Kwak,Jae Kyun Ju,Seung-Seop Yeom,Soo Young Lee,Chang Hyun Kim,Young Jin Kim,Hyeong Rok Kim 대한외과학회 2020 Annals of Surgical Treatment and Research(ASRT) Vol.98 No.3
Purpose: Radical lymph node dissection for right-sided colon cancer is technically challenging. No clear guideline is available for surgical resection of clinical stage I right-sided colon cancer. This study was designed to review the pathologic stage of clinical stage I right-sided colon cancer and determine the relevant extent of surgical resection. Methods: Patients were treated for clinical stage I right-sided colon cancers (cecal, ascending, hepatic flexure, and proximal transverse colon) between July 2006 and December 2014 at a tertiary teaching hospital. Open surgery was not included because laparoscopic surgery is an initial major procedure in the institution. Results: During the study period, 80 patients diagnosed with clinical stage I right-sided colon cancer were classified into 2 groups according to the pathology: stage 0/I and II/III. Tumor sizes were larger in the stage II/III group (P = 0.003). The stage II/III group had higher rates of vascular (P = 0.023) and lymphatic invasion (P = 0.023) and lower rates of well differentiation (P = 0.022). During follow-up, 1 case of local and 4 cases of systemic recurrences were found. Multivariate analysis to confirm odds ratios affecting change from clinical stage I to pathological stage II/III showed that tumor size (P = 0.010) and the number of retrieved lymph nodes (P = 0.046) were risk factors. Conclusion: For right-sided colon cancer, even with clinical stage I included, radical lymph node dissection should be performed for exact staging with sufficient number of lymph nodes. This will help determine appropriate adjuvant treatment, especially in large tumor sizes