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유상영(SY Ryu),박교훈(KH Park),전종관(JK Jun),박서영(SY Park),이동원(DW Lee),윤보현(BH Yoon),신희철(HC Shin) 대한산부인과학회 1996 Obstetrics & Gynecology Science Vol.39 No.10
Moyamoya disease is a rare condition characterized by angiographic evidence of bilateral narrowing and occlusion of the internal carotid arteries, along with the presence of an abnormal capillary network of vessels at the base of the brain. Clinically, this disease is found with a higher incidence in young female, but there are few cases of moyamoya disease in pregnancy. We describe two cases of pregnancy with known moyamoya disease, which have delivered successfully by elective cesarean section with epidural anesthesia.
진행성 난소암에서 분리중합효소연쇄반응 ( differential PCR ) 을 이용한 HER-2/neu 종양유전자 증폭양상의 임상적 유용성에 관한 연구
유상영(SY Ryu),강순범(SB Kang) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.2
The HER-2/neu oncogene, located on chromosome 17q, encodes a transmembrane cell surface glycoprotein of 185kD that is similar to the epidermal growth factor receptor. HER-2/neu oncogene amplification was shown to occur in a number of adenocarcinomas and seems to be a valuable prognostic parameter. This present study was carried out to investigate the prevalence of HER-2/neu oncogene amplification by differential polymerase chain reaction and to examine whether HER-2/neu oncogene overamplification has any prognostic significance in advanced ovarian cancer patients. Amplification of HER-2/neu oncogene was assessed in 32 cases of FIGO stage Ⅲ and Ⅳ advanced ovarian cancers(24 epithelial ovarian cancers, 2 Brenner tumors, 2 malignant mixed mullerian tumors, 2 granulosa cell tumors, 1 struma ovarii, 1 Krukenberg tumor) using differential polymerase chain reaction. HER-2/neu oncogene was amplified in all of the ovarian cancers(100%, 32/32), but significant overamplification[gene copy number ≥ 1.5 a.u.(arbitrary unit)] was assessed in 50%(12/24) of epithelial ovarian cancers. There was no correlation between HER-2/neu oncogene overamplification and cell type or grade of tumor or initial CA-125 level. The clinical complete remission rate in high copy group(gene copy number ≥ 1.5 a.u.) was 25%(3/12) and that of low copy group(gene copy number < 1.5 a.u.) was 50%(6/12), and pathologic complete remission rate was 0%(0/12) in high copy group and 25%(3/12) in low copy group. Median survival in high copy group was 28 months and 35 months in low copy group, and there was no correlation between HER-2/neu oncogene overamplification and overall survival(p=0.12). This result suggests that HER-2/neu oncogene overamplification is not a significant prognostic factor of advanced ovarian cancer, but large scaled prospective randomized studies are required.
인간 정자의 수정 능력 평가에 있어서 ARIC 검사의 유용성에 관한 연구
류범용(BY Ryu),김석현(SH Kim),박서영(SY Park),지병철(BC Jee),정병준(BJ Jung),김희선(HS Kim),방명걸(MG Pang),오선경(SK Oh),서창석(CS Suh),최영민(YM Choi),김정구(JK Kim),문신용(SY Moon),이진용(JY Lee),손영수(YS Son) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.10
Over recent years, major emphasis has been focused on the management of male factor infertility, and it has become increasingly clear that standard semen analysis has many limits for the prediction of fertilization. As in vitro fertilization and embryo transfer (IVF-ET) is an important therapeutic option in male factor infertility, enormous efforts have been geared towards the development of better tests that might predict the fertilizing potential of a given semen specimen. The present study was designed to evaluate and verify the effectiveness of the acrosome reaction following ionophore challenge (ARIC) test as a prognostic indicator of fertilization capacity of human spermatozoa. Such parameters as the spontaneous reaction rate (control), the induced reaction rate (ionophore challenged), and the difference between the spontaneous and induced rates (ARIC value), and the proportion of spermatozoa capable of reacting in response to calcium influx were measured in 86 men with good fertilization rate (≥30%) and 39 men with poor fertilization rate (<30%) undergoing IVF-ET. While the spontaneous reaction rate had no relation to the fertilizing capacity, the induced reaction rate and ARIC value were significantly reduced in the poor fertilization group, indicating acrosomal dysfunction is a likely cause of fertilization failure. In evaluating the effectiveness of ARIC test, ROC curve was used. Among the various thresholds for the prediction of fertilizing capacity, ARIC value 8.5 corresponded to the value with higher sensitivity and lower false positive rate, and was determined as a cut-off value. Using this cut-off point, sensitivity, specificity, positive predictive value (PPV), and negtive predictive value (NPV) for ARIC test was 83.7%, 92.3%, 96.0% and 72.0%, respectively. These results suggest that ARIC test can be a valuable tool as a prognostic indicator of fertilization capacity of human spermatozoa.
Climate-induced variations in atmospheric nitrous oxide during the Holocene
Syed Azharuddin,Jinho Ahn,Yeongjun Ryu,Ed Brook 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Nitrous Oxide (N₂O) is an important greenhouse gas that responds to climate change and causes strong ozone destruction. The primary sources of atmospheric N₂O are nitrification and denitrification occurring in terrestrial soils and the ocean whereas its main sink is the photolysis in the stratosphere. Several studies focussed the climate-related response of atmospheric N₂O during glacial-interglacial periods. However, limited attempts are made to focus the mechanism of N₂O variation during the Holocene. Here we present a high-resolution N₂O record obtained from South Pole Ice (SPICE) during the Holocene. The N₂O analysis is performed in specialised wet extraction facility installed at Seoul National University that used minimum size of ice (<20 gm per measurement) to yield a high precision (~1.5 ppb average standard deviation). The obtained N₂O mixing ratios agree well with the existing records on the millennial scale as well as suggest some new inferences on a multi-centennial scale. We prepared a new N₂O composite by combining our new results from SPICE with the other existing records to understand the multi-centennial to millennial scale N₂O variations during the Holocene. We observe a local N₂O maximum at 11-10 ka corresponding to intensified Asian Monsoon and the Arabian Sea (AS) OMZ. Subsequently, we observe a local N₂O minimum around 8.8-6.2 ka possibly related to the weakening of sub-surface denitrification due to ventilated OMZs around the Eastern Tropical South Pacific (ETSP) and AS. The record also indicates a progressive increase in atmospheric N₂O between 6.2 ka and 2.2 ka leading to another local N₂O maximum around 2.2 ka. This N₂O increase shows good correlation with the intensification of Southern Hemisphere monsoons and intensified OMZ around ETSP and AS. Another abrupt N₂O minimum at around 1.4 ka is observed, which might be associated with the decrease in Northern Hemisphere temperature and weakening of Asian Monsoon. The atmospheric N₂O shows a rapid increase since the Industrial Revolution.
2D Pose Nodes Sampling Heuristic For Fast Loop Closing
Syed Zain Mehdi,Jee-Hwan Ryu 한국자동차공학회 2017 한국자동차공학회 지부 학술대회 논문집 Vol.2017 No.6
Graph SLAM approach has been gaining much attention in SLAM research recently thanks to its ability to provide better map and full trajectory estimation when compared to filter based SLAM approaches. Even though graph SLAM requires batch processing it to be comparatively computationally expensive, recent advancements in optimization and computing power enable it to run fast enough to be used even in real-time. However, data association problem still requires much of computation when building a pose graph. For example, to find loop closures it is necessary to consider the whole history of robot trajectory and sensor data within the confident range. As a pose graph grows, the number of candidates to be searched also grows. It makes searching the loop closures a bottleneck in SLAM algorithm. Our approach to alleviate this bottleneck is to sample limited number of pose nodes in which loop closures are searched. We propose a heuristic for sampling pose nodes that are most advantageous to closing loops by providing a way of ranking pose nodes in order of usefulness.
문신용(SY Moon),김석현(SH Kim),정병준(BJ Jung),지병철(BC Jee),최성미(SM Choi),김희선(HS Kim),류범용(BY Ryu),방명걸(MG Pang),오선경(SK Oh),서창석(CS Suh),최영민(YM Choi),김정구(JK Kim),이진용(JY Lee) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.8
The recent advent of intracytoplasmic sperm injection (ICSI) in IVF-ET has revolutionized the management of male factor infertility. In patients with poor semen analysis, disordered acrosome reaction, severe oligoasthenoteratozoospermia (OAT), and even azoospermia, all were able to conceive successfully with IVF-ET using ICSI. However, it is extremely important to establish the strict indications for ICSI to avoid the unnecessary application of ICSI and its overuse, and to prevent the possibility of transmitting genetic abnormalities, although long-term data is not yet available. The present study was designed to establish the clinical indications of ICSI, and to evaluate the effectiveness of ICSI in the management of male factor infertility. From February, 1996 to August, 1997, a total of 156 cycles of ICSI was performed in 83 IVF-ET patients, and grouped according to the results of three andrologic tests including strict morphology of sperm, acrosome reaction after ionophore challenge (ARIC) test, and sperm penetration assay (SPA) developed in this study: Group I -39 patients (72 cycles) with at least one abnormal andrologic test or fertilization rate <30% in the previous conventional IVF-ET cycles, Group Ⅱ-22 patients (41 cycles) with severe OAT which made it impossible to perform the andrologic tests, and Group Ⅲ-22 patients (43 cycles) with nonobstructive azoospermia. The fertilization rate was 72.0±22.6% in Group Ⅰ, 65.7±23.6% in Group Ⅱ, and 61.6±22.7% in Group Ⅲ. The clinical pregnancy rate per ET was 19.7% (14/71), 15.0% (6/41), and 19.0% (8/42), respectively. There was no significant difference in the fertilization and clinical pregnancy rates among three groups. In summary, strict morphology, ARIC test and SPA can be valuable tools as the prognostic indicators of fertilization capacity in ICSI. The effective management with microassisted fertilization(MAF) by ICSI can dramatically improve the pregnancy rate in couples with male factor infertility, and contribute much to the management of all infertile couples.