• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.120-120
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• 2023

본 연구에서는 CCTV 영상 내 빗줄기의 특성을 바탕으로 강우강도를 산정하기 위한 합성곱 신경망(CNNs, Convolutional Neural Networks) 기반 강우강도 산정 모형을 제안하였다. 중앙대학교 및 한국건설생활환경시험연구원 내 대형기후환경시험실에서 얻은 CCTV 영상들을 대상으로 연구를 수행하고, 우적계 등과 같은 지상 관측자료와 강우강도 산정 결과를 비교·검증하였다. 먼저, CCTV 영상 내 빗줄기의 미세한 변동 특성을 반영하기 위해 데이터 전처리 작업을 진행하였다. 이는 원본 영상으로부터 빗줄기 층을 분리해내는 과정, 빗줄기 층에서 빗물 입자를 분리해내는 과정, 그리고 빗물 입자를 인식하는 과정 등 총 세 단계로 구분된다. 합성곱 신경망 기반 강우강도 산정 모형 구축을 위해 영상 전처리가 완료된 데이터들을 입력값으로 설정하고, 촬영 시점에 대응되는 지상관측 자료를 출력값으로 고려하여 강우강도 산정모형을 훈련시켰다. CCTV 원자료 내 특정 영역에 편향되어 강우강도를 산정하는 과적합 현상의 발생을 방지하기 위해 원자료 내 5개의 관심 영역(ROI, Region of Interest)을 설정하였다. 추가로, CCTV의 해상도를 총 4개(2560×1440, 1920×1080, 1280×720, 720×480)로 구분함으로써 해상도 변화에 따른 학습 결과의 차이를 분석·평가하였다. 이는 기존 사례들과 비교했을 때, CCTV 영상을 기반으로 빗줄기의 거동 특성과 같은 물리적인 현상을 직간접적으로 고려하여 강우강도를 산정했다는 점과 더불어 머신러닝을 적용하여 강우 이미지가 갖는 본질적인 특징들을 파악했다는 측면에서, 추후 본 연구에서 제안한 모형의 활용 가치가 극대화될 수 있을 것으로 판단된다.

• Physical Therapy Korea
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• v.5 no.4
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• pp.9-19
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• 1998

연구목적 이 연구의 목적은 피로유발수축후 장딴지근과 가자미근의 근전도 power spectrum 중앙경항치를 비교 검사하는 것이다. 실험대상 열 여섯명의 자원자(남자 10, 여자 6)를 대상으로 하였다. 남자 대상자의 연령범위는 25세에서 33세(평균 $28.6{\pm}2.5$)였고 여자 대상자의 연령범위는 26세에서 31세($27.8{\pm}1.9$)였다. 실험방법 실험대상자는 피로유발수축전후 50% 최대등척성근수축을 수행하였다. 자료수집과 분석을 위해 LabVIEW 소프트웨어를 사용하였다. 결과 t-검정결과 내측 장딴지근에서는 피로유발수축후 주파수의 중위값과 평균이 통계적으로 유의하게 감소하였으나 가자미근에서는 통계적으로 유의한 차이가 없었다. t-검정결과 두 근육간 주파수 감소의 차이는 통계적으로 유의한 차이가 있었다. 토의 및 결론 이 결과들은 피로유발수축후 근전도 power spectrum 중앙경향치가 저주파대역으로 감소함을 나타내었다. 이 연구는 중앙주파수와 평균주파수가 피로지수로서의 신뢰도와 타당도가 뛰어나며 객관적 측정과 훈련효과 평가로 사용할수 있음을 보였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.6
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• pp.649-656
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• 2014

In this paper, we address the problem of center lane detection algorithm for autonomous driving. Color information for center lane is gathered by analyzing a row line color distribution of road in front of a vehicle. The candidate pixels for center lane are extracted from the histogram of road colors. Morphological filtering and clustering process are applied to the candidate pixels to extract the exact center lane. We predict a expected area of center lane and search only the regions in subsequent frames, that reduces the time required for center lane detection.

• Journal of Digital Contents Society
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• v.16 no.6
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• pp.951-959
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• 2015

Scene text extraction is important because it offers some important information on different image based applications pouring in current smart generation. Edge-Enhanced MSER(Maximally Stable Extremal Regions) which enhances the boundaries using the canny operator after extracting the basic MSER shows excellent performance in terms of text extraction. But according to setting the threshold of the canny operator, the result images using Edge-Enhanced MSER are different, so there needs a method figuring out the threshold. In this paper, we propose a AEMSER(Adaptive Edge-enhanced MSER) that applies the method extracting the boundary using the middle value of histogram to Edge-Enhanced MSER to get the canny operator's threshold. The proposed method can acquire better result images than the existing methods because it extracts the area only for the obvious boundaries.

• Radiation Oncology Journal
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• v.18 no.1
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• pp.27-31
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• 2000

Purpose : The aim of this study was to investigate treatment results, toxicity and efficacy of hypefractionated radiation therapy combined with paclitaxel for paraaortic node recurrence in cervix cancer. Materials and Methods: Between September 1997 to March 1999, 12 patients with paraaortic node recurrence in cervix cancer who previously received radical or postoperative radiotherapy were treated with hypefractionated radiation therapy combined with paclitaxel. Of these, 2 patients who irradiated less than 30 Gy were excluded, 10 patients were eligible for this study. Median age was 51 years. Initial FIGO stage was 1 stage IBI, 2 stage IIA, 7 stage IIB. For initial treatment, 7 patients received radical radiotherapy and 3 received postoperative radiotherapy. The paraaortic field encompassed the gross recurrent disease with superior margin at T12, and inferior margin was between L5 and S1 with gap for previously pelvic radiation field. The radiation field was initially anterior and posterior opposed field followed by both lateral field. The daily dose was 1.2 Gy, twice daily fractions, and total radiotherapy dose was between 50.4 and 60 Gy(median, 58.8 Gy). Concurrent chemotherapy was done with paclitaxel as a radiosensitizer. Dose range was from 20 mg/m$^{3}$ to 30 mg/m$^{3}$ (median, 25 mg/m$^{3}$), and cycle of chemotherapy was from 3 to 6 (median, 4.5 cycle). Follow-up period ranged from 3 to 21 months. Results : Interval between initial diagnosis and paraaortic node recurrence was range from 2 to 63 months (median, 8 months). The 1 year overall survival rate and median survival were 75$\%$ and 9.5 months, respectively. The 1 year disease free survival rate and median disease free survival were 30$\%$ and 7 months, respectively. At 1 month after treatment, 4 (40$\%$) achieved a complete response and 6 (60$\%$) experienced a partial response and all patients showed response above the partial response. There was distant metastasis in 6 patients and pelvic node recurrence In 2 patients after paraaortic node irradiation. There was 2 patients with grade 3 to 4 leukopenla and 8 patients with grade 1 to 2 nausea/ vomiting which was usually tolerable with antlemetic drug. There was no chronic complication in abdomen and pelvis during follow up period. Conclusion : hypefractionated radiation therapy combined with paclitaxel chemotherapy diosensitizer showed high response rate and few complication rate in paraaortic node recurrence in cervix cancer Therefore, present results suggest that hypefractionated radiation therapy combined with paclitaxel chemotherapy can be used as optimal treatment modality in this patients.

• Clinical and Experimental Pediatrics
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• v.51 no.2
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• pp.156-161
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• 2008

Purpose : Neutropenic enterocolitis is an acute, life-threatening inflammation of the small and large bowel, often seen in children with malignancies during periods of prolonged or severe neutropenia. The optimal management for typhlitis in pediatric oncology patients has been debateful between operative and nonoperative approaches. The purpose of this study was to review the outcome of medical management of patients who were diagnosed as typhlitis. Methods : The records of 207 pediatric cancer patients who were diagnosed and treated at the pediatric department of Yeungnam University Hospital for cancer between August, 2002 and July, 2007 were reviewed. Results : Among 207 patients, 12 (5.7%) children aged 9 to 14 years, were diagnosed clinically to have typhlitis. Clinical symptoms and signs of patients were fever, abdominal pain and tenderness, diarrhea, vomiting and rebound tenderness. Bowel-wall thickening (> 4mm) was seen on CT or ultrasonography. All patients were treated with antibiotics combinations of teicoplanin, carbapenem, aminoglycoside, or other third generation cephalosporin and metronidazole or clindamycin. Eight patients were treated with additional antifungal agents. Other supportive management included bowel rest, total parenteral nutrition, and G-CSF administration. All patients recovered completely and did not need any surgical management. Conclusion : Early diagnosis and aggressive supportive treatment appears to be important for complete recovery and survival of typhlitis.

• Journal of Chest Surgery
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• v.37 no.6
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• pp.530-535
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• 2004

Background: Thoracoscopic R3 (above the third rib)sympathicotomy has been performed as an effective method in treating palmar hyperhidrosis because it is effective in eliminating the symptoms of hyperhidrosis and has lower degree of compensatory hyperhidrosis than that of sympathectomy. Most of the results published were based on the short-term follow up. So we evaluated the intermediate term follow up results of the R3 sympathicotomy. Material and Method: From April 1999 to August 2001, ninety-four patients with palmar hyperhidrosis had been treated by R3 sympathicotomy at the Inha University Hospital. Follow-up study was completed for 76 patients (male 38, female 38) and average follow-up period were 25$\pm$9.1 (15∼50) months. The sympathetic trunk passing above the upper border of third rib was divided by electric cautery. The patient's satisfaction after surgery was estimated using the analogue scale from score 0 to 100 (100 means perfect satisfaction). Result. The scale of patient's satisfaction immediately after operation was 92.36$\pm$9.93. After 15 months, the scale of satisfaction was decreased to average 71.80$\pm$20.24 and it is statiscally significant. The cause of dissatisfaction were compensatory hyper-hidrosis and recurrence of symptom. The degree of sweating immediately after operation was mean 0 and after 15 months it increased to mean 1.5. The degree of the compensatory hyperhidrosis immediately after operation was mean 1 and it increased to mean 5 after 15 months. Conclusion: R3 sympathicotomy has excellent therapeutic results immediately after operation but therapeutic effectiveness is becoming to decrease 15 months after operation. The common causes of dissatisfaction are compensatory hyperhidrosis and recurrence of hyperhidrosis.

• Radiation Oncology Journal
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• v.14 no.2
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• pp.87-93
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• 1996

Purpose : To determine the incidence and prognostic effects of EGFR over-expression in the high-grade astrocytomas. Materials and Methods : With 23 paraffin blocks of the high-grade astrocytomas (7 anaplastic astrocytomas and 16 glioblastoma multiforme), expression of EGFR were evaluated by immunohistochemical staining employing polyclonal antibody raised to short cytoplasmic domain of the molecule. Result : Two out of 7 anaplastic astrocytomas and 9 out of 16 glioblastoma multiforme patients showed overexpression of EGFR(p=0.44). Three out of 11 patients of age below 55 and 8 out of 12 patients of age over 54 showed EGFR overexpression(p=0.141). Median survival of the EGFR negative anaplastic astrocytoma patient was 37 months. Median survival of the glioblastoma multiforme Patients were 11 months in EGFR negative group and 7 months in EGFR positive group. But survival difference was not significant (p=0.17). Conclusion There was a marked trend of increasing overexpression of EGFR in older patients. But survival of the glioblastoma multiforme decreased by the overexpression of the EGFR without significant.

• Journal of Yeungnam Medical Science
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• v.21 no.2
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• pp.198-206
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• 2004

Background: To evaluate the efficacy and safety of paclitaxel and cisplatin against advanced non-small cell lung cancer (NSCLC) as a second-line chemotherapy. Subjects and Methods: Twenty-five patients were enrolled. The patients received 200 $mg/m^2$ paclitaxel as a 3-hour intravenous infusion and 60 $mg/m^2$ cisplatin as 2D-minute intravenous infusion with vigorous hydration on day 1 every 28 days. The response was assessed every 2 cycles. Results: All 25 patients were assessed for their response and toxicity. Partial responses were observed in 5 patients. The overall response rate was 20%(95% confidence interval, 4%-36%) and the median response duration was 4.5(range, 2-11) months. The median time to progression was 3.3(range, 0-14) months. The median overall survival of all patients was 7.4(range, 1.3-39) months. The hematologic toxicities were minor and easily controlled. Conclusion: The combination chemotherapy of paclitaxel and cisplatin as a second-line treatment has a moderate efficacy with an acceptable toxicity in patients with advanced NSCLC.

• Journal of Chest Surgery
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• v.43 no.3
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• pp.273-279
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• 2010

Background: The benefit of superior vena cava (SVC) resection in thoracic malignancies remains controversial. We analyzed the results of extended resection in patients with thoracic malignancy involving the SVC. Material and Method: From March 2000 to March 2009, we performed surgical resection and reconstruction in 18 thoracic malignancies involving the SVC. Ten male and 8 female enrolled and their mean age was 56 years. Result: SVC reconstruction was performed in 9 patients with polytetrafluoroethylene (PTFE) graft. Primary closure was possible in 6 patients by partially clamping the SVC. Patch angioplasty was performed in 3 patients with PTFE or autologous pericardial patch. Three-year survival was 58.0% and median survival time was 24.5 months. Disease specific survival and recurrence free survival were not significantly different between lung cancer and mediastinal malignancy. Obstruction of graft was detected in 4 patients during follow-up; SVC graft obstruction in 1 patient, and accessory graft between the innominate vein and right atrium in 3 patients. Conclusion: Extended resection of thoracic malignancies involving the SVC was a feasible method in selected patients. Although the morbidity rate was relatively high, mid-term survival was acceptable when complete resection was possible.