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이용복(Yong-Bok Lee),정재근(Jae-Keun Jung) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.6
For this study, SM45C steel rods using generally for power transmission shafts and machine components was selected and welded by butt-GMAW method. And then it was studied about estimation of fatigue strength and the region of infinite life by Haigh diagram using Goodman's equation. Fatigue strength in weld zone presents highly in order of the boundary between deposited metal zone and heat affected zone, deposited metal zone, heat affected zone. This result agrees with distribution of hardness in weld zone. Fatigue strength in base metal zone presents highly compared with weld zone in low cycles between 10⁴ cycles and 10?cycles, but it presents the lowest fatigue strength on the order of heat affected zone in the vicinity of 10?cycles. It is the result that the first high compressive residual stress distributed by drawing process of the steel rods is released and the base metal is softened by alternating stresses. The region of infinite life by Haigh diagram presents highly in order of the boundary between deposited metal zone and heat affected zone, deposited metal zone, heat affected zone. From this results, it is demanded that the stress for safety design of machine components using SM45C butt-welded steel rods must be selected in the region of the lowest infinite life of heat affected zone.
신우미 ( Woo Mi Shin ),송재연 ( Jae Yen Song ),김용욱 ( Yong Wook Kim ),김태응 ( Tae Eung Kim ),정재근 ( Jae Keun Jung ),노덕영 ( Duck Yeong Ro ),맹이소 ( Lee So Maeng ) 대한산부인과학회 2006 Obstetrics & Gynecology Science Vol.49 No.9
Fibrosarcoma of the ovary is an exceedingly rare primary ovarian stromal tumor, which has a poor prognosis. Fibrosarcoma may arise de novo or as a result of malignant change in a benign fibromatous or fibrothecomatous tumor of the ovary. There are only about 30 cases in the literature reported within past three decades, showing the extreme rarity of these tumors. We report a case of primary ovarian fibrosarcoma with a review of the available literature.
임신능이 확인된 가임 여성에서의 Deciduosis의 유병율
김미란,유영옥,노덕영,류순원,권동진,김장흡,김진홍,임용택,김은중,정재근,이진우,Kim, Mee-Ran,Lew, Young-Oak,Ro, Duck-Yeong,Ryu, Sun-Won,Kwan, Dong-Jin,Kim, Jang-Heub,Kim, Jin-Hong,Lim, Yong-Taik,Kim, Eun-Jung,Jung, Jae-Keun,Lee, Jin-Woo 대한생식의학회 2000 Clinical and Experimental Reproductive Medicine Vol.27 No.4
Objective: Extrauterine formation of decidua of stromal cells has been well described, particularly in the cervix and ovary. The apparent hormonal mechanisn of this phenomenon suggestes a relationship to endometriosis. Whether formation of ectopic decidua represents a marked progestational response of endometriosis or an independent peritoneal-stromal reaction to pregnancy is unclear. This study was designed to determine the prevalence of deciduosis in the patients whose fertility were proven. Design: Prospective study of patients who had undergone cesarean delivery without history of endometriosis. Materials and Methods: The study was performed in 179 full tenn pregnant women. During the cesarean section, the pelvic organs were thoroughly investigated and the biopsies were collected at the lesions suspicious endometriosis. And then microscopic examination of removed tissues were done. Results: Of the 179 patients who underwent cesarean delivery, 48 women (26.8%) had the lesions suspicious endometriosis such as adhesion, pigmented spots. The ovary was the most frequently ocurred site (79.2%). Microscopically, decidual cells were observed in 34 cases (70.8%) of 48 biopsed patients. Conclusion: Endometriosis has been known to be associated with subfertility. Our observations found the prevalence of deciduosis was 19.0% (34/179) in tenn pregnant women whose fertilites were proven. We suggests that the deciduosis maya manifestation of endometriosis during pregnancy. However, further follow up study should be done to confirm this clinicopathologic process.