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일란성 쌍태 중 일측 태아의 인어체기형 (Sirenomelia)
정상근 ( Jeong Sang Geun ),김현철 ( Kim Hyeon Cheol ),김유신 ( Kim Yu Sin ),김윤아 ( Kim Yun A ),김조영 ( Kim Jo Yeong ),김지연 ( Kim Ji Yeon ),신승주 ( Sin Seung Ju ),김낙근 ( Kim Nag Geun ),강혜윤 ( Kang Hye Yun ),박정선 ( Park 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.4
Sirenomelia is a lethal congenital malformation characterized by single or fused lower limbs associated with other severe genitourinary and lower gastrointestinal tract anomalies. Associated anomalies include malformation of vertebrae and pelvis, oligohyd
헤어핀 권선이 적용된 IPMSM의 구동 속도별 고정자 슬롯 형상 파라미터 변화에 따른 AC동손 민감도 분석
정상근(Sang-Geun Jeong),김태형(Tae Heoung Kim),강동우(Dong-Woo Kang) 대한전기학회 2021 전기학회논문지 P Vol.70 No.4
High-output, high-efficiency, and light-weight technologies of electric motors are attracting attention. Among related technologies, the technology of improving SFF(Slot Fill Factor), which means the ratio of the coil area to the stator slot area, enables weight reduction through high power density. As a method of improving SFF, there is a hairpin winding method using a rectangular coil. This has the advantage of high output because it takes up more slot area than when using a general round coil. However, this winding method has limitations in achieving high efficiency with AC copper loss under specific operating conditions such as high frequency and high current. Therefore, the hairpin model considering the reduction of AC copper loss can maximize its advantages. In this paper, the cause of AC copper loss is analyzed to reduce AC copper loss, and the AC copper loss sensitivity to changes in stator shape parameters and driving speed is analyzed through simulation analysis.
정상근,Jeong, Sang-Geun 한국통신학회 2016 정보와 통신 Vol.33 No.10
본고에서는 플랫폼 산업으로 빠르게 재편되고 있는 산업계의 변화에 대해서 언급하고, 플랫폼 산업의 핵심 경쟁력 중 하나로써 인공지능을 살펴본다. 특히 최근 인공지능기술로 각광받고 있는 딥러닝과 플랫폼 비즈니스의 상호 상승작용을 고찰함으로써 향후 산업계에 필요한 핵심 경쟁력을 살펴본다.
자궁근종이 있는 한국여성에서 자기공명영상 유도하 고집적 초음파수술: 초기 임상경험
윤상욱 ( Sang Wook Yoon ),김경아 ( Kyoung Ah Kim ),황윤영 ( Youn Young Hwang ),이찬 ( Chan Lee ),차선희 ( Sun Hee Cha ),이선영 ( Sun Young Lee ),김용민 ( Yong Min Kim ),나영정 ( Young Jeong Na ),정상근 ( Sang Geun Jung ),김승조 ( 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.9
Objective: The purpose of this report is to review the safety and short-term efficacy of non-invasive magnetic resonance imaging-guided focused ultrasound surgery (MRgFUS) on uterine myomas in Korean women. Methods: A total of 29 outpatient Korean women, whose mean age was 39.1±5.8 years, were treated using the MRgFUS system for their symptomatic uterine myomas. Patients` symptoms were recorded using a validated symptom-specific questionnaire on treatment day, and at follow-up visits, 3 and 6 months post treatment. Data on adverse events was recorded on each follow up period. Results: Symptom improvement was experienced by 83% of the patients at the three months follow-up, and 90% of the patients reported on improved quality of life by the six months follow-up. There were no serious adverse events during the treatments or the follow-up period. Conclusion: MRgFUS appears to be a safe and effective treatment for symptoms relief of uterine fibroids. Additional reports on longer follow up should verify long-term durability.
김병곤,최상근,정헌생,한상근,이재장,Kim, Byeong-Gon,Choe, Sang-Geun,Jeong, Heon-Saeng,Han, Sang-Geun,Lee, Jae-Jang 한국재료학회 2001 한국재료학회지 Vol.11 No.8
천연흑연은 단위구조가 탄소육각망평면이 평행하게 배열된 층상으로 전기전도도 및 윤활성이 우수하나 소수성이 매우 강하며, 표면화학적 목성이 거의 없기 때문에 다른 물질과 흡착이 쉽게 일어나지 않아 분산이 매우 어려운 물질이다. 따라서 본 연구에서는 제타전위를 이용하여 흑연에 ABDM을 흡착시켜 표면특성을 소수성에서 친수성으로 변화시키고 수중현탁액 중에서 흑연입자의 분산 메커니즘을 DLVO이론을 이용하여 설명하였다. 흑연의 제타전위가 22.5mV가 되도록 ABDM의 흡착량 (20mg/g) 및 조건 (PH 10에서 12시간 흡착)을 만족시키면 분산안정성 (T$_{1/2}$) 이 44.5시간인 고분산성 흑연 현탁액을 제조할 수 있다. The surface of natural graphite has not only good electrical conductivities and lubrication properties but also has strong hydrophobicity. There are no functional groups and chemical properties on it. It is difficult to join with any other ions and to disperse in aqueous system. In order to increase dispersion ability throughout modification of surface property, it is necessary to let graphite have some function on its surface by the adsorption of surfactant molecules. In this study, using zeta potential adsorbed surfactant molecules(ABDM) on graphite surface and its surface Properties turn hydrophobic into hydrophilic. The dispersing mechanism of graphite particles in aqueous system has been explained using the DLVO theory, It is concluded that the high dispersable graphite suspension of which dispersing stability$(T_{1/2})$ is 44.5 hours at pH 10 and 22.5mV zeta potential can be produced.
자궁내막암에 있어 수술 후 보조 방사선치료법과 수술 후 복합항암화학치료법의 임상 비교 연구
최민철 ( Min Chul Choi ),박지현 ( Ji Hyeon Park ),김수현 ( Su Hyun Kim ),전경훈 ( Kyung Hun Jun ),정상근 ( Sang Geun Jung ),나영정 ( Young Jeong Na ),이선영 ( Sun Young Lee ),이찬 ( Chan Lee ),황윤영 ( Yeun Young Hwang ),김승조 ( 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.11
Objective: This study was performed to compare postoperative adjuvant paclitaxel and platinum (TC) chemotherapy and radiation therapy in women with uterine endometrial carcinoma. Methods: Total one hundred five patients were entered into this trial. Non-endometrioid histologic subtypes such as serous, clear cell and small cell types were excluded from the study because they have different biological potentials. Of 58 assessable patients, who were needed adjuvant treatment according to surgico-pathologic reports, after surgery, 34 were received TC chemotherapy and 24 were received radiation therapy. Chemotherapy consisted of paclitaxel 175 mg/m2 and carboplatin AUC 5 (or cisplatin 50 mg/m2) every 3 weeks for 3 or 6 cycles. Irradiation dosage was 4,500~5,040 cGy in 28 fractions. Results: In 58 evaluated patients, median follow-up time was 40.3 months (range 7~64 months). The 5-year overall survival and 5-year disease-free survival were 91.3% and 91.0% in 34 patients treated with TC chemotherapy, and 91.4% and 82.8% in 24 cases who treated with radiation therapy, however, there were no significant difference (P=0.646, P=0.129). The most common adverse effect of TC chemotherapy was hematologic toxicity, which was manageable conservatively. The serious gastrointestinal complication of radiotherapy was noted in 5 patients (20.8%), three of these patients were received another bowel surgery, such as ileo-cecal bypass, however, symptoms were persisted after surgery. Conclusions: These data suggest that postoperative adjuvant TC chemotherapy is a promising treatment which could be substituted for radiation therapy, with major activity and a acceptable toxicity profile for the treatment of uterine endometrial carcinoma.
난소암에서 IGF-2 와 H19 gene 의 promoter 이용과 발현정도의 변화
김윤아 ( Kim Yun A ),이찬 ( Lee Chan ),김승조 ( Kim Seung Jo ),이선영 ( Lee Seon Yeong ),김인호 ( Kim In Ho ),나영정 ( Na Yeong Jeong ),정상근 ( Jeong Sang Geun ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.3
Objective : To establish the possible role of imprinting in ovarian cancer, we determined the imprinting status of both IGF-2 and H-19 genes in ovarian cancer, borderline tumors of ovary, benign ovarian tumor and normal ovarian tissues. Methods : An allelictyping assay was performed using a PCR-RFLP-based method for identification of heterozygous informative cases. The usage of Insulin-like growth factor-Ⅱ (IGF-2) promoters was examined by RT-PCR using promoter-specific primers. The mRNA expression of IGF-2 and H19 was quantified using a densitometer. Results : Loss of imprinting (LOI) of IGF-2 was observed in the order of borderline tumor (77%)>cancer (71%)>benign tumor (60%)>normal ovarian tissues (50%) respectively. And the LOI of H19 gene was not detected in the normal and benign tissues but observed in the borderline tumor and cancer tissues, respectively. The usage of promoter P1, P2, P3 and P4 were observed different pattern in normal, benign tumor, borderline tumor and cancer tissues. The activity of mRNA expression of promoter P4 was higher than other promoters. The cancer tissues predominantly used promoter P1, P2 with relative silencing of the promoter P3. The ovarian cancer tissues showed the higher expression levels of the IGF-2 but a down-regulation of the H19 relative to normal tissues. Conclusion : These results suggest that LOI, deregulation of the IGF-2 promoters, and the altered expression levels of the IGF-2 and h19 gene might be associated with progression of ovarian cancer.
상피성 난소암에서 Wnt 1과 β-catenin의 발현에 관한 연구
임경란 ( Kyoung Ran Yim ),이찬 ( Chan Lee ),김용민 ( Yong Min Kim ),김광일 ( Kwang Il Kim ),김승조 ( Seung Jo Kim ),황윤영 ( Youn Yeung Hwang ),이선영 ( Seon Yeong Lee ),나영정 ( Young Jeong Na ),정상근 ( Sang Geun Jeong ),오예은 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.9
Objective: We were trying to identify the expression of Wnt 1 and β-catenin in normal ovarian epithelium and epithelial ovarian tumor. Methods: We used archival formalin-fixed and paraffin-embedded tissues from Comprehensive Gynecologic Cancer Center and the Department of Pathology at Bundang CHA Hospital from 2000 to 2005. Immunohistochemical staining for Wnt 1 and β-catenin was performed on the ovarian epithelial tissues. Statistical analyses were performed with SPSS 10.1 for Windows and significance was defined as P<0.05. Results: Of 114 cases, the cases were composed of 54 carcinomas, 40 borderline tumors, 12 benign tumors and 8 normal control ovarian tissues. Abnormal nucleocytoplasmic expression of β-catenin was found in 4 endometrioid carcinomas. The nuclear expression of β-catenin was found especially in the components of the endometrioid carcinoma (28.6%, P<0.05). Wnt 1 was overexpressed in all 9 clear cell carcinomas, but not frequent in the other types of malignant tumors (P<0.05). We found a statistically significant correlation between β-catenin nuclear localization and endometrioid carcinomas. And we found a significant correlation between Wnt 1 expression and clear cell carcinomas. Conclusion: It does not seem that Wnt 1 over expression directly provoke the nuclear localization of β-catenin. But, deregulation of β-catenin and Wnt 1 may play a role in the pathogenesis of ovarian epithelial carcinogenesis of endometriod carcinoma and clear cell carcinoma. Evaluating this avenue of regulation of β-catenin and Wnt protein in ovarian epithelial carcinoma may provide a new direction for early diagnosis and treatment in ovarian epithelial carcinoma and provide opportunities for making a certain biomarkers.