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Effect of weld geometry on fatigue performance of 6061-T6 aluminum GMAW: part 1. Butt joint
Sang-Woo Han,Geonho Lee,Hansol Kim,Min-Soo Kim,Young-Rae Jo,Jung Ho Cho 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
The use of aluminum in automobile bodies has increased in recent years due to its various advantages. However, the research conducted on the fatigue performance of aluminum arc welding is limited. This study conducts 6061-T6 aluminum GMAW experiments for the various weld geometries to determine their effect on the fatigue performance. These weld geometries, which include full penetration, partial penetration, welding with misalignment, different toe angles, and double butt joints, are obtained by controlling the welding conditions. Full penetration presents the best fatigue performance, and the toe angle exhibits a relatively minimal effect on fatigue performance. Misalignment causes a large reduction in the fatigue performance. In the partial penetration and double butt joint case, the non-welded part, where the stress is concentrated, is located at the bottom. Therefore, these two cases present a relatively lower fatigue performance. In the automobile production process, the use of a backing plate is limited; therefore, controlling the penetration depth significantly improves the fatigue performance, despite the difficulty in obtaining the desired penetration depth. Double butt joints present the advantage of penetration depth control; therefore, a double butt joint can be considered as an appropriate alternative solution for full penetration despite the additional cost involved in the double butt joint preparation.
Sang-Wook Lee(이상욱),Myung-Rae Cho(조명래),Byoung-Kwan Lee(이병관),Sang-Bong Ko(고상봉),Dong-Kyu Shin(신동규),Koing-Woo Kwon(권굉우) 대한정형외과학회 2004 대한정형외과학회지 Vol.39 No.5
목적: 대퇴 경부 골절 환자에서 수술시 고정을 위해 사용하는 유관 나사를 이용하여 향후 대퇴 골두 골 괴사의 예측 방법에 대하여 조사하였다. 대상 및 방법: 1999년 3월부터 2001년 2월까지 44명을 대상으로 최소 25개월 이상 추시 관찰하였으며, 평균 나이는 51세(18-76세)였다. 근위부에 삽입된 유관 나사의 두부에 있는 관으로부터 출혈 유무를 관찰하였는데, 출혈군은 38예, 비 출혈군은 6예였다. 추시에서 대퇴 골두 골 괴사는 단순 방사선 사진으로 판독하였다. 두 군에서 유관나사 부위의 출혈 유무와 무혈성 괴사의 발생 관계에 있어 민감성, 정확성, 양성 예측도, 음성 예측도를 조사하였다. 결과: 대퇴 골두 골 괴사는 7예(16%)에서 발생하였다. 출혈군은 38예 중 1예(2.6%), 비 출혈군은 6예 모두에서 대퇴 골두골 괴사가 발생하였다. 비 출혈군과 골두 골 괴사의 관계에서는 민감도 86%, 정확도 100%, 양성 예측도 100%, 음성 예측도가 97%였다. 결론: 대퇴 경부 골절 환자에서 추후 발생할 수 있는 대퇴 골두 골 괴사에 대한 예측 방법으로 수술 중 유관 나사의 두부관 출혈 유무가 단순하면서 유용한 방법으로 판단된다. Purpose: The aim of this study was to examine the validity of using cannulated screws as a method for predicting avascular necrosis of the femoral head after a fixation of fractures in patients with femoral neck fractures. Materials and Methods: Between March 1999 and January 2001, 44 patients with a femoral neck fracture that had been fixed with cannulated screws were enrolled in this study. The follow up period was more than 25 months and the mean age of the patients was 51 years (range, 18 to 76 year). Blood drainage in the holes of the screw head was checked. There were 38 cases in the bleeding group, and 6 cases in the non-bleeding group. The development of head necrosis was evaluated using plain radiography. The validity of the relationship between the two groups and head necrosis was evaluated by the sensitivity, specificity, the positive predictive value, and the negative predictive value. Results: An avascular necrosis of the femoral head developed in 7 cases (16%). Only one of the 38 patients in the bleeding group developed head necrosis (2.6%). However, all those in the non-bleeding group developed head necrosis (100%). The sensitivity was 86%, the specificity was 100%, the positive predictive value was 100%, and the negative predictive value was 97%. Conclusion: Bleeding from holes in the cannulated screws is a simple and accurate perfusion assessment for predicting the development of an avascular necrosis of the femoral head after a femoral neck fracture.
Lee, Sang-Mong,Park, Nam-Sook,Park, Hye-Jin,Yun, Eun-Young,Kang, Seok-Woo,Kim, Keun-Young,Sohn, Hung-Dae,Jin, Byung-Rae Korean Society of Sericultural Science 2000 International Journal of Industrial Entomology Vol.1 No.2
The female pupae of the silkworms Bombyx mori, were injected with recombinant Autographa californica nuclear polyhedrosis virus (AcNPV) expressing green fluorescent protein (GFP) by percutaneous inoculation. When the 4 day-old female pupae were injected with 1x10$^{7}$ or 2${\times}$10$^{7}$ plaque forming units (pfu) of the recombinant AcNPV, oviposited number and egg weight were significantly decreased. Furthermore, the shape of the eggs was obviously divides into normal and abnormal shapes. The percentage of the eggs with an abnormal shape was 7.8% and 57.1% at 1${\times}$10$^{7}$ and 2${\times}$10$^{7}$ pfu inoculation, respectively. PCR analysis of the genomic DNA extracted from the eggs revealed that gfp and AcNPV ecdysteroid UDP-glucosyltransferase genes were amplified from both types of eggs with normal and abnormal shapes. The results demonstrate that AcNPV DNA, and gfp gene cloned into the AcNPV genome, injected in pupal stage were transmitted to eggs and remained stable through at least next generation.
Lee, Soon Jeong,Hwang, Mi Sook,Park, Myoung Ae,Baek, Jae Min,Ha, Dong-Soo,Lee, Jee Eun,Lee, Sang-Rae The Korean Society of Phycology 2015 ALGAE Vol.30 No.3
Pythium species (Pythiales, Oomycetes) are well known as the algal pathogen that causes red rot disease in Pyropia / Porphyra species (Bangiales, Rhodophyta). Accurate species identification of the pathogen is important to finding a scientific solution for the disease and to clarify the host-parasite relationship. In Korea, only Pythium porphyrae has been reported from Pyropia species, with identifications based on culture and genetic analysis of the nuclear internal transcribed spacer (ITS) region. Recent fungal DNA barcoding studies have shown the low taxonomic resolution of the ITS region and suggested the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene as an alternative molecular marker to identify Pythium species. In this study, we applied an analysis of both the ITS and cox1 regions to clarify the taxonomic relationships of Korean Pythium species. From the results, the two closely related Pythium species (P. chondricola and P. porphyrae) showed the same ITS sequence, while the cox1 marker successfully discriminated P. chondricola from P. porphyrae. This is the first report of the presence of P. chondricola from the infected blade of Pyropia yezoensis in Asia. This finding of the algal pathogen provides important information for identifying and determining the distribution of Pythium species. Further studies are also needed to confirm whether P. chondricola and P. porphyrae are coexisting as algal pathogens of Pyropia species in Korea.
Partial Polyhedrin Fusion Expression Enhance the Production of Recombinant Protein in Baculovirus
Sung Min Bae,Bit Na Rae Yun,Jun Beom Lee,Hee Jung Kim,Tae Young Shin,Jae Bang Choi,Yeon Ho Je,Byung Rae Jin,Soo Dong Woo 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
Polyhedrin is the major component of the nuclear viral occlusions produced during replication of the baculovirus Autographa californica multicapsid nuclear polyhedrosis virus (AcMNPV). To enhance the expression level of baculovirus vector system, we constructed several fusion vectors using various fragments of the polyhedrin. The polyhedrin fragments were genetically fused to the enhanced green fluorescent protein (eGFP) under the control of polyhedrin promoter, and their expressions were analyzed in Sf21 insect cells. Expression of the fusion protein was identified by SDS-PAGE and Western blot analysis using anti-GFP and anti-Polyhedrin. The expression level of eGFP was markedly increased by the fusion of partial polyhedrin. Also, the fluorescence intensity of fusion proteins was higher than that of non-fusion protein. Confocal laser scanning microscopy demonstrated that fusion proteins were localized to the cytosol or nucleus of insect cells. In additional, the glycoprotein E2 (gE2) of classical swine fever virus (CSFV) expressed by the these vectors was dramatically increased and its immunogenicity was proofed using experimental animal guinea pigs that were immunized with the partial polyhedrin containing gE2. This study provides a new option for the higher expression of useful foreign recombinant protein by using the partial polyhedrin in BEVS.
( Sang Gyun Kim ),( Seon Mi Ji ),( Na Rae Lee ),( Seung-Hee Park ),( Ji Hye You ),( Il Ju Choi ),( Wan Sik Lee ),( Seun Ja Park ),( Jun Haeng Lee ),( Sang-Yong Seol ),( Ji Hyun Kim ),( Chul-Hyun Lim ) 대한소화기학회 2017 Gut and Liver Vol.11 No.1
Background/Aims: Endoscopic submucosal dissection (ESD) has been an established treatment for indicated early gastric cancer (EGC) without deterioration of quality of life (QOL) compared with surgical resection. The aim of this study was to evaluate long-term QOL in patients undergoing ESD for EGC. Methods: Patients scheduled to undergo curative ESD for EGC were prospectively enrolled from 12 institutions between May 2010 and December 2011. Assessments of QOL with Korean versions of the European Organization for Research and Treatment of Cancer (EORTC) QOL questionnaire- core (QLQ-C30) and a gastric cancer-specific questionnaire (STO22) were performed at baseline and at 7 days, 3 months, and 6 months after ESD. Results: A total of 666 subjects were assessed for QLQ-C30 and QLQ-STO22. The mean QLQ-C30 score was 69.5 at baseline, 68.8 at 7 days, 73.1 at 3 months, and 73.2 at 6 months. The global health status on the EORTC QLQ-C30 was significantly improved after 3 and 6 months (p=0.0003 and p<0.0001, respectively). The QLQ-C30 and STO22 scores were not significantly different, or they only slightly deteriorated between before and immediately after ESD, but they were significantly improved after 3 and 6 months (p<0.05). Conclusions: QOL did not deteriorate immediately after ESD, and it improved more significantly at up to 6 months in patients who underwent curative ESD for EGC without significant complications. (Gut Liver 2017;11:87-92)
Effect of Dominant Versus Non-dominant Vision in Postural Control
Rae-Young Park,Soe-Ra Yoon,Hoi-Sung Kee,Jung-Ho Kang,Su-Jin Lee,Kwang-Ik Jung 대한재활의학회 2011 Annals of Rehabilitation Medicine Vol.35 No.3
Objective To assess the eff ect of dominant and non-dominant vision in controlling posture in quiet stance. Method Twenty-fi ve healthy elderly subjects aged over 60 years old and twenty-fi ve young subjects aged under 30 years old were assessed by computerized dynamic posturography. Postural stability was measured in two conditions; dominant eye open and non-dominant eye open. We used the sensory organization test (SOT) for evaluating sensory impairment. A SOT assessed the subject’s ability to use and integrate somatosensory input,vision, and vestibular cueseff ectively to maintain balance. The SOT was conducted 3 times, and the average value of the 3 trials was used for data analysis. Equilibrium scores reflected the subject’s anteroposterior sway. The highest possible score was 100, which indicated that the subject did not sway at all, and a score of 0 indicated a fall from the footplate. Determination of ocular dominance was performed by a hole-in-the card test. Results For the twenty-five young subjects in this study, equilibrium score in two conditions did not differ. However, for elderly subjects over 60 years, the equilibrium score in dominant vision was higher than in nondominant vision (p<0.05). Conclusion In young subjects, there were no signifi cant diff erences in postural control between dominant vision and non-dominant vision. However, in elderly subjects, postural control in non-dominant vision was signifi cantly impaired. Therefore, the evaluation of a dominant eye should be considered in rehabilitation programs for elderly people.