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( Chan Young Ock ),( Bhumsuk Keam ),( Tae Min Kim ),( Doo Hee Han ),( Tae Bin Won ),( Se Hoon Lee ),( J Hun Hah ),( Tack Kyun Kwon ),( Dong Wan Kim ),( Dong Young Kim ),( Chae Seo Rhee ),( Hong Gyun W 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: The role of induction chemotherapy in head and neck squamous cell carcinoma (HNSCC) has been suggested but poorly established in the paranasal sinus and nasal cavity (PNS-NC). Periorbital involvement is frequently observed and need of eyeball exenteration for safe margin is concerned in HNSCC of PNS-NC. We evaluated the treatment outcome of patients with induction chemotherapy focused on eyeball preservation in HNSCC of PNS-NC. Methods: Medical records were reviewed for 21 patients diagnosed with HNSCC of PNS-NC and treated with induction chemotherapy in Seoul National University Hospital from August 2005 to March 2012. Overall survival, response rate, and eyeball preservation rate were analyzed. Results: Of total 21 patients, median age was 57 years old and 15 were male. Tumors were located in paranasal sinus (N=14) and nasal cavity (N=7). Most patients had T4 stage, consists of 10 patients of T4a and 7 patients of T4b. Induction chemotherapy regimens were DFP (Docetaxel plus fiourouracil plus Cisplatin, N=11), FP (N=8), and DP (N=2). Median follow-up duration was 83.1 (range 28.8-109.1) months, and overall survival rate at 3 years was 61.5%. Thirteen patients (61.9%) had partial response by induction chemotherapy, and 15 patients (71.4%) achieved T down-staging. Among patients with T4 stage, which is high risk of orbital exenteration, 14 out of 17 patients (82.4%) eventually preserved the involved eye. Three-year overall survival rate of patients who had partial response to induction chemotherapy was 76.2% compared with 37.5% in those with stable disease or progression to induction chemotherapy. Conclusions: In this single center retrospective analysis, induction chemotherapy could be active for downstaging of T stage, and reasonable option for eyeball preservation in HNSCC of PNS-NC.
권용남(Young-Nam Kwon),김상현(S. H. Kim),김상우(S. W. Kim),구본규(Bo Kyu Gu) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
A cold forging process for hollow shaft shape was designed by using finite element method in the present study. Hollow shaft products have been widely used for auto transmission parts and other applications. Hollow shaft has been usually fabricated with gun drill machining to lower the weight of final product. However, more cost efficient ways to manufacture hollow type product has been sought since conventional machining usually costs quite much. There have been several ways to make hollow type forgings such as rotary swaging and rotary forging, which cost a lot of initial machine cost. In the present study, a conventional cold forging process was designed to make hollow shaft product using several step forgings.
기울어진 피해구조물의 원상복구를 위한 기초지반 개량공법에 관한 연구
( W. B. Samson ),정덕교 ( Chung Duck-kyo ),우근우 ( Woo Keun-woo ),정영교 ( Chung Young-kyo ),권용완 ( Kwon Yong-wan ),천병식 ( Chun Byung-sik ) 한국구조물진단유지관리공학회 1997 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.1 No.1
Compaction grouting is a remediation method of m-situ soil densification by grout injection under pressure for diffential settlements and tilted structures. Recently in Korea, there are major construction projects such as rapid transit, subway, airport, bridge and new city construction. But, inevitably there are many cases constructed in bad ground condition like a soft ground and inhomogeneous soil layer. We have many problems which are differential settlements and negative effect of near structure in such cases. This paper describes compaction grouting technique for lifting structures suffered differential settlement.
Ajay C. Kanakamedala,Dhruv S. Shankar,Neil Gambhir,Matthew R. Boylan,Michael Boin,Matthew G. Alben,Mandeep S. Virk,Young W. Kwon 대한견주관절학회 2023 대한견주관절의학회지 Vol.26 No.4
Background: The purpose of this study was to evaluate the effect of concomitant open distal clavicle excision (DCE) on postoperative clinical outcomes and incidence of acromial and scapular stress fractures (ASFs) in patients with symptomatic acromioclavicular joint osteoarthritis (ACJ OA) undergoing reverse total shoulder arthroplasty (RTSA). Methods: A single-surgeon retrospective cohort study was conducted including patients who underwent primary elective RTSA with or without DCE from 2015 to 2019 with a minimum 6-month follow-up period. Shoulder active range of motion (AROM) and visual analog scale (VAS) pain were recorded preoperatively and postoperatively. ASFs and other adverse events were identified using postoperative notes and/or radiographs. Characteristics and outcomes were compared between the RTSA and RTSA-DCE groups. Results: Forty-six RTSA patients (mean age, 67.9±8.7 years; 60.9% male; mean follow-up, 24.9±16.6 months) and 70 RTSA-DCE patients (mean age, 70.2±8.9 years; 20.0% male; mean follow-up, 22.7±12.9 months) were included. There were no significant intergroup differences in rates of ASF (RTSA, 0.0% vs. RTSA-DCE, 1.4%; P=1.00), stress reactions (RTSA, 8.7% vs. RTSA-DCE, 11.4%; P=0.76), reoperation, revision, or infection (all P>0.05), or in pre-to-postoperative reduction in VAS pain (P=0.17) at latest follow-up. However, the RTSA-DCE group had greater pre-to-postoperative improvement in flexion AROM (RTSA, 43.7°±38.5° vs. RTSA-DCE, 59.5°±33.4°; P=0.03) and internal rotation (IR) AROM (P=0.02) at latest follow-up. Conclusions: Concomitant DCE in RTSA improves shoulder flexion and IR AROM, alleviates shoulder pain, and does not increase the risk of ASFs. Level of evidence: III.