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윤상철,허윤경,최재갑,Yoon, Sang-Chul,Hur, Yun-Kyung,Choi, Jae-Kap 대한안면통증구강내과학회 2007 Journal of Oral Medicine and Pain Vol.32 No.4
The aim of this study was to measure the suprathreshold taste intensity for NaCl, sucrose, citric acid, and quinine HCl in elderly Korean women using a whole-mouth, sip-and-spit procedure, employing the method of magnitude matching. The results were analysed in terms of aging, menopause, and salivary flow rate. 31 elderly women (mean age; $50.8{\pm}5.1$ years) and 30 young women (mean age; $25.1{\pm}1.71$ years) were included for the study. Subjects were instructed to give nonmodulus magnitude estimates to the intensities of five concentrations each of sucrose, NaCl, citric acid, and quinine HCl; distilled water; 6 loudness level of a 1,000-Hz tone, using the same 9-point intensity scale. Each of the 21 taste stimuli and 6 auditory stimuli are presented in random order twice. The auditory function is used to assess the absolute intensity function of the subject's taste system. The results were as follows; 1. Comparing to young women, elderly women showed decreased taste intensities for lower concentration solutions of NaCl and sucrose. However, other solutions didn't show any difference in taste intensities between young and elderly women. 2. There were not significant difference in perceived taste intensities for NaCl, sucrose, citric acid, and quinine HCl between menopause and pre-menopause women in elderly women group. 3. There were not significant difference in perceived taste intensities for NaCl, sucrose, and quinine HCl between low salivation women and high salivation women in elderly women group. 4. The low salivation women in elderly group showed higher taste intensity for low concentration citric acid than high salivation women.
Attention-Mechanism을 결합한 Hybrid 딥러닝 기반 주간 전력수요예측
윤상철(Sang-Cheol Yun),김병호(Byoungho Kim),김홍래(Hongrae Kim) 대한전기학회 2024 전기학회논문지 Vol.73 No.9
In the current situation of increasing power demand, research is needed for better electricity demand forecasting. This study presents a new approach to enhance the accuracy of electricity demand forecasting. The objective of this study is to facilitate more precise Load Forecasting by incorporating the Attention Mechanism into the existing deep learning models, LSTM and GRU. For this purpose, LSTM and GRU models combined with Attention Mechanism were applied to actual power demand data. The experimental results confirmed that the proposed model significantly improved the accuracy of power demand prediction compared to the existing models. These results show that the addition of Attention Mechanism can contribute to improving the performance of deep learning-based power demand prediction models.
정맥문합부 협착이 있는 인조혈관 동정맥루의 폐색 전 수술과 폐색 후 수술의 장기 개통률 비교
윤상철(Sang Chul Yun),송단(Dan Song),문철(Chul Moon) 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.78 No.6
Purpose: The most frequent complication in vascular access for hemodialysis is the stenosis of venous anastomosis site and resultant thrombosis. And it has been suggested that the correction of stenosis before thrombosis can prolong graft survival. We compared the outcomes of surgical repair between stenosed group and thrombosed group. Methods: From March 2003 to July 2007, 155 cases of stenosed graft-venous anastomosis (GVA) of arteriovenous graft (AVG) underwent salvage operation; 53 elective revisions for stenosis (group A), and 102 emergency open thrombectomies with jump grafts (group B). Outcomes were compared by post-intervention primary patency (PIPP) and post-intervention secondary patency (PISP). Results: The mean follow-up duration was 24.8±15.2 months. Surgical success rate was 100% for elective revision group and 98% for emergency operation group. Elective revision of symptomatic GVA stenosis improved PIPP compared to emergency operation of thrombosed graft (mean 13.0 vs. 8.6 months, P=0.018). But PISP was not extended (mean 24.2 vs. 23.2 months, P=0.359). The electively revised GVA stenosed graft had fewer subsequent thrombotic events (0.3 vs 0.7 thrombosis/patient year, P=0.027) and fewer interventions (0.6 vs. 1.2 interventions/patient year, P=0.06). The proportion of other stenoses for group A and group B was 35.8% and 38.2%, respectively. Conclusion: The frequency of subsequent thrombotic events and total number of postoperative interventions decreased significantly after elective revision. Elective revision of GVA stenosis in PTFE graft prolongs PIPP, and should be considered before the occurrence of thrombosis.
고객의 성격유형에 따른 특급호텔 양식당 선택속성에 관한 연구
우성근 ( Sung Kuen Woo ),윤상철 ( Sang Chul Yun ),안성근 ( Sung Kuen Ahn ) 한국호텔ㆍ리조트ㆍ카지노산학학회 2009 호텔리조트연구 Vol.8 No.1
The goal of this study is to draw the most proper cause and suggest the method for considering the competitive power of the western restaurant in deluxe hotel by verifying the selective attribute of western restaurant according to customer`s character before real purchase action of various customers using hotel`s western restaurant occurs. Its research results are as follows: First, when considering the difference between the specialty of customer and the selective attribute of the western restaurant of special grade hotel, it showed that it wasn`t influenced by the quality, service and image of the food of the western restaurant of special grade hotel, however, it also showed that it wasn`t also influenced by its facility and environment. Second, when considering the difference according to the selective attribute of the western restaurant of hotel and the character of customer, males thought that the quality, facility and environmental factor of the food are important and females thought that image factor is more important.