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우주현(Joohyun Woo),김낙완(Nakwan Kim) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.12
This paper proposes vision-based collision risk estimation method for an unmanned surface vehicle. A robust imageprocessing algorithm is suggested to detect target obstacles from the vision sensor. Vision-based Target Motion Analysis (TMA) was performed to transform visual information to target motion information. In vision-based TMA, a camera model and optical flow are adopted. Collision risk was calculated by using a fuzzy estimator that uses target motion information and vision information as input variables. To validate the suggested collision risk estimation method, an unmanned surface vehicle experiment was performed.
우주현(Joohyun Woo),김낙완(Nakwan Kim) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.3
This paper proposes a potential field-based guidance law for docking a USV (unmanned surface vehicle). In most cases, a USV without side thrusters is an under-actuated system. Thus, there are undockable regions near docking stations where a USV cannot dock to a docking station without causing a collision or backward motion. This paper suggest a guidance law that prevents a USV from enter such a region by decreasing the lateral error to the docking station at the initial stage of the docking process. A Monte-carlo simulation was performed to validate the performance of the proposed method. The proposed method was compared to conventional guidance laws such as pure pursuit guidance and pure/lead pursuit guidance. As a result, the collision angle and lateral distance error of proposed method tended to have lower values compared to conventional methods.
폐경 전 호르몬 수용체 양성 유방암 환자의 난소기능 측정을 위한 방법
김현아,우주현,최향숙,이석준,최지혜,박찬섭,성민기,노우철 이화여자대학교 의과학연구소 2017 EMJ (Ewha medical journal) Vol.40 No.3
The evaluation of menopausal status is an important subject in the field of treatment of hormone receptor positive breast cancer. According to the menopausal status, endocrine therapy should be categorized by individual patient. However, the gonadal injury caused by various therapeutic drugs and its recovery would confuse the interpretation of clinical and biological markers for ovarian reserve. There are some methods to examine the functional ovarian reserve indirectly. Ultrasonography for counting follicles is a relatively reliable procedure, although it is not feasible because of time-labor consumption and high cost. Biological marker from blood samples such as serum follicle stimulating hormone (FSH), serum estradiol (E2), serum inhibin, or anti-Müllerian hormone (AMH) would be a better choice. The examination of serum FSH and E2 is already recommended as biomarkers for measuring functional ovarian reserve in many guidelines. However, there are limitation of serum FSH and E2 in patients with chemotherapy- induced amenorrhea and treated by tamoxifen. AMH is promising biomarker in the field of infertility treatment even in the patients treated by chemotherapy. It might be a possible biomarker to determine the menopausal status for decision-making whether aromatase inhibitor could be applicable or not in hormone positive breast cancer patients with chemotherapy induced amenorrhea or treated by tamoxifen.
우주현,임우성 이화여자대학교 의과학연구소 2017 EMJ (Ewha medical journal) Vol.40 No.1
Selenium is an essential microelement in animals including human. Selenium plays an important role in cellular functions such as deoxygenation and detoxification. Also, it can be used in treatment of cardiac disease, hepatic disease, AIDS and various cancers. Recent meta-analysis showed that high selenium exposure was associated with decreased risk of several cancers. Selenium has an effect on anticarcinogesis through several mechanisms, which are regulation of cell cycles, apoptosis, DNA damage and repair, inhibition of cellular adhesion and migration, anti-angiogenesis and immune modulation. Even though many laboratory studies have provided convincing evidence of these mechanisms, results from epidemiologic and clinical studies of selenium does not coincide with each other. Well-designed trials considering dosage and chemical form of selenium supplement as well as confounding factors and long-term follow-up of them would be needed to use selenium in chemoprevention and therapy of cancers.
우주현,임우성 이화여자대학교 의과학연구소 2014 EMJ (Ewha medical journal) Vol.37 No.2
Breast cancer is the second most common cancer in Korean women and its mortality rate has increased steadily. Although breast cancer is heterogeneous tumor, hormone receptor-positive tumors comprise about 75 percent of all breast cancers. Therefore endocrine therapy that works by targeting estrogen receptor is a pivotal treatment for breast cancers. There are selective estrogen receptor modulators, such as tamoxifen and raloxifene, aromatase inhibitors, such as anastrozole, letrozole and exemestane, fulvestrant and luteinizing hormone-releasing hormone agonists used in endocrine therapy. Endocrine therapy is effective in treating early breast cancer as an adjuvant therapy and metastatic breast cancer as a palliative therapy. Also in women who are at high risk for breast cancer, tamoxifen or raloxifene can prevent breast cancer. Studies for neoadjuvant endocrine therapy are emerging. Considering side effects of each drug and overcoming drug resistance are needed to maximize effectiveness of treatment and advance endocrine therapy.