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EPON망에서 OPNET을 이용한 주기적 폴링 기반의 동적 대역 할당 방법의 성능평가
유승진 ( Seung Jin Yoo ),최수일 ( Su Il Choi ) 전남대학교 전자통신기술연구소 2008 전자통신기술논문지 Vol.11 No.1
EPON망은 효율적이고 경제적인 광대역 가입자망이다. EPON망에서 개별 ONU에게 상향 대역을 할당하는 여러 가지 방법이 있는데, 효율적인 대역 할당을 위해 ONU간 통계적 다중화를 고려한 동적대역할당(DBA: Dynamic Bandwidth Allocation) 방안으로 여러 가지 알고리즘이 제시되었다. 본 논문에서는 DBA 방법 중 차등 CoS(Class of Service) 제공을 위한 주기적 폴링에 기반한 동적대역할당 방법을 이용하여 OPNET을 통한 시뮬레이션 모델을 구현하였다. 그리고 OPNET 시뮬레이션 모델을 통해 주기적 폴링에 기반한 동적대역할당의 필요성 및 유용함을 보였다. 본 논문에서 구현한 시뮬레이터는 EPON망에서 논의될 수 있는 여러 가지 기술적인 측정항목을 반영하여 모의 실험을 통해 성능평가 결과를 제시할 수 있을 것이다. Ethernet Passive Optical Networks(EPONs) are an efficient and a low-cost broadband access networks. In EPON network, there are many methods allocating upstream bandwidth to each ONU and many algorithms proposed for Dynamic Bandwidth Allocation(DBA) method considering static multiflexing between ONUs. In this paper, We develop simulation model for DBA based cyclic polling providing CoS(Class of Service) by using OPNET. We present that DBA method based cyclic polling is necessary and useful method by using OPNET simulator. We expect that this simulator can help to determine various parameters and to analyze statistics which are considered for designing EPON.
공간디자이너와 소비자의 감성인식의 차이에 관한 연구 -브랜드 커피전문점 공간디자인을 중심으로-
유승진 ( Seung Jin Yoo ),이재규 ( Jae Kyu Lee ) 한국공간디자인학회 2014 한국공간디자인학회논문집 Vol.9 No.4
(Background and Purpose) There is an emotional aspect of design, and spatial designers attempt to connect the design of a space with their customers’ emotions. Nowadays, the importance of differentiated emotional spatial design has become important in coffee franchises, which have increased in number and which have transformed into cultural spaces, not merely spaces for food or beverages. This study was undertaken to determine how efficiently spatial designers intend to reach customers of coffee franchises; a further aim was to find out the emotional differences between spatial designers and customers. (Method) We selected four representative coffee franchises in Korea and conducted a survey to evaluate the emotions of spatial designers and customers in an independent sample. To determine if emotional differences between the two groups were meaningful, an independent t-test and regression analysis were performed. (Results) A difference regarding the recognition of emotion between spatial designers and customers was revealed. Using this finding as an important concept in designing space will enable spatial designers to plan more efficiently to design space from the customer’s point of view and emotions.
유승진 ( Seung Jin Yoo ),진종언 ( Jong-eon Chin ),오성훈 ( Sung Hoon Oh ),류민정 ( Min Jung Ryu ),황권택 ( Kwontack Hwang ) 한국키틴키토산학회 2018 한국키틴키토산학회지 Vol.23 No.3
본 실험은 떡 가공상품을 가정식 대체식으로 이용하고자 유통기한을 설정하였다. 통팥찰떡과 녹두깨찰떡에 대하여 실험을 실시하였고, 떡은 편의용으로 하고자 증숙 후 바로 tray에 sealing하는 구조로 개발하였고, 증숙후 바로 처리에 따른 미생물 오염을 최소화하고자 하였다. 냉장유통을 위하여 0, 4, 10℃에서 총균수, 대장균군, 수분함량, 관능변화검사, 물성변화, 색도변화를 측정하였다. 최장 21일간의 시험에서, 2종의 시료에서 총균수는 5.87±0.09 log를 넘지 않았고, 대장균군은 두 시료 모두 검출되지 않았다. 수분함량변화에서는 통팥찰떡과 녹두깨찰떡은 3가지 온도 모두에서 시간에 따라 유의하게 차이가 나지 않았다. 색도의 변화중 특히 L값의 변화가 저장기간 중 유의적 차이가 없었다. 또한 물성의 변화가 5% 미만을 유지하여 노화에 따른 변화가 나타나지 않았다. 다만 관능적 변화에서 통팥찰떡의 21일에 유의적인 저하를 보여, 최대 설정한 여러 품질지표 중「식품공전」규격에 따라 떡의 품질한계일을 설정하였다. 실험결과 떡의 품질한계일은 0℃에서 21일, 4℃에서 21일, 10℃에서18일로 산출되었다. 제품 유통 시 여러 가지 변수를 고려하고자 안전계수 0.8을 곱하여 최종 유통기한은 16일(0℃, 4℃), 14일(10℃)로 설정하였다. In this experiment, we set the expiration date to use the rice cake processing product as a substitute for home. Experiments were carried out on the brown rice cake and green bean curd rice cake. The rice cake was developed to be sealed to the tray immediately after boiling for convenience, and it was tried to minimize microbial contamination due to the treatment immediately after boiling. Total bacterial counts, coliform group, moisture content, sensory evaluation, physical properties, and chromaticity were measured at 0, 4, and 10℃ for refrigerated distribution. In the test for up to 21 days, the total number of bacteria in the two samples did not exceed 5.87 ± 0.09 log, and the two samples were not detected in the coliform group. The changes of moisture content did not show a significant difference in time between the three kinds of temperature. There was no significant difference in the L value among the changes of chromaticity during the storage period. Also, changes in physical properties were maintained at less than 5%, indicating no change due to aging. However, the sensory change showed a significant decrease in 21 of Korean sweet rice cakes, and the quality limit date of rice cakes was set according to the “Food Codes” standard among the maximum set quality indicators. The quality limit of rice cake was 21 days at 0℃, 21 days at 4℃ and 18 days at 10℃. The final shelf life was set to 16 days (0℃, 4℃) and 14 days (10℃) by multiplying the safety factor of 0.8 by various factors in product distribution.
즐례 : 저칼슘혈증을 동반한 급성 화농성 갑상선염 1예
유승진 ( Seung Jin Yoo ),심명숙 ( Myoung Sook Shim ),김원준 ( Won Jun Kim ),김은정 ( Eun Jung Kim ),오광훈 ( Kwang Hoon Oh ),이제훈 ( Je Hoon Lee ),권준성 ( Jun Sung Kwon ) 대한내과학회 2014 대한내과학회지 Vol.86 No.1
We report a case of acute suppurative thyroiditis complicated by idiopathic hypoparathyroidism. The patient was a 49-year-old female who visited our clinic with a painful goiter on the left lobe of the thyroid gland. She was hypocalcemic, which was accompanied unusually by acute suppurative thyroiditis. She also suffered from tetany of both hands and legs. She had undergone a right subtotal thyroidectomy at another hospital 23 years previously due to a benign thyroid nodule. Intact parathyroid hormone (PTH) levels were increased, but other laboratory findings were normal. No special treatment was administered for the acute suppurative thyroiditis, except antibiotics, to observe its natural course. Her PTH levels decreased and serum calcium returned to normal. The complication of acute suppurative thyroiditis suggested the possible involvement of idiopathic hypoparathyroidism. (Korean J Med 2014;86:79-83)
이승아(Seung A Lee),김기환(Kee Hwan Kim),김지일(Ji Il Kim),안창혁(Chang Hyeok An),김정수(Jeong Soo Kim),유승진(Seong Jin Yoo),임근우(Keun Woo Lim) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.73 No.4
Primary retroperitoneal mucinous cystadenocarcinoma is a rare tumor, and it is similar to its ovarian counterpart, but it is without any evidence of ovarian, pancreatic or any other extra-retroperitoneal origin. The histogenesis of this neoplasm remains uncertain. Mucinous or colemic metaplasia of the retroperitoneal mesothelium has recently been proposed as its origin. A 39-year-old woman was diagnosed with a 13-㎝ cystic lesion in the left retroperitoneum; this was mucinous cystadenocarcinoma and no primary tumor was identified. We report here on a primary retroperitoneal mucinous cystadenocarcinoma that involved the splenic hilum, and we include a review of literature.
유승한(Seung-Han You),유승진(Seungjin Yoo),한진오(Jin-Oh Hahn),이교일(Kyo Il Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This paper presents new approaches to identify vehicle lateral velocity and road-bank angle in real-time. The main challenge in the identification of lateral velocity and road-bank angle is that they are lumped together with the disturbance induced by system parametric uncertainties such as variations of vehicle mass and cornering stiffness of tires. This paper develops two estimation algorithms using the parameterized model for the identification of parametric uncertainties, which enables the real-time estimation of vehicle lateral velocity and road-bank angle via algebraic formulation. The decent performance of the proposed estimation methods is verified using simulation results on CARSIM, proving their practicability in real-world applications.
조진범(Jin Bum Cho),조항주(Hang Joo Cho),신옥란(Ok Ran Shin),김기환(Kee Hawn Kim),안창혁(Chang Hyeok Ahn),김정수(Jeong Soo Kim),유승진(Seung Jin Yoo),임근우(Keun Woo Lim),김지일(Ji Il Kim) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.74 No.6
Purpose: A mucocele of the appendix is an uncommon pathology, representing 0.2% to 0.3% of all appendix specimens. It is often diagnosed clinically as a result of its ability to cause signs and symptoms similar to those of acute appendicitis. If it is asymptomatic, it is often detected as an incidental finding during ultrasonography, computed tomography, radiographic examination of the gastrointestinal tract, or laparotomy. The purpose of this study was to identify the clinical features of mucocele of the appendix. Methods: We describe 35 cases of mucocele of the appendix diagnosed at Uijeongbu St. Mary’s hospital between January 1993 and December 2006. We analyzed demographic, clinical, and pathologic data of all the cases. Results: A total of 12 males and 13 females with mean age of 54.7±14.9 years are described. The peak incidence occurred in the seventh decade (34.3%). Sixteen patients presented with symptoms and signs similar to those found in acute appendicitis. Ten patients complained of a palpable mass, 2 patients complained of non-specific abdominal pain, and 7 patients were asymptomatic. Fourteen cases were diagnosed preoperatively, and 3 cases were discovered incidentally. Pathologic examination revealed mucosal hyperplasia in 20% of the cases, cystadenoma in 71%, and cystadenocarcinoma in 9%. The mean age of cystadenocarcinoma patients was older than the mean age of mucosal hyperplasia patients, and the diameter of the appendix was larger in cystadenoma patients than in mucosal hyperplasia patients. Conclusion: The preoperative diagnosis of appendiceal mucocele is very important to make in order to facilitate treatment planning and avoid inadvertent rupture of the mucocele during operation. We recommend more diagnostic studies in cases of suspected mucocele. Mucocele of the appendix must be included in the differential diagnosis of patients with pain in the right iliac fossa, patients older than 40 years of age, patients suffering from long-term symptoms, and patient with a palpable mass in the right iliac fossa.