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H₂ 준최적제어기의 변수화를 이용한 혼합된 H₂H<SUB>∞</SUB> 최적제어기 설계
류동기(Dong Ki Ryu),방경호(Kyeong Ho Bang),윤한오(Han O Yun),박홍배(Hong Bae Park) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
In this paper, we proposed a mixed H₂H∞ optimal controller design method using the parameterization of H₂ suboptimal controller. The method is based on the minimization of H₂ performance measure with an H∞ -norm constraint. We also derived the necessary and sufficient conditions for existence of solution from the decoupled Riccati equations. And the designed controller has state-space representation.
LED TV를 위한 단일전력단 전류평형 다채널 LED 구동회로
류동균(Dong-Kyun Ryu),원충연(Chung-Yuen Won),한상규(Sang-Kyoo Han) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.6
A single-stage current-balancing multi-channel light-emitting diode (LED) driver is proposed in this study. The conventional LED driver system consists of two cascaded power conversion stages, i.e., an isolation DC/DC converter and LED driver. LED driver is usually implemented with the same number of expensive boost converters as those of LED channels to tightly control the current through each LED channel. Therefore, its overall system size is not only bulky, but the cost is rather high. By contrast, the proposed LED driver system is composed of a single power stage with the DC/DC converter and LED driver merged. Although the current balancing circuit of the proposed LED driver requires only passive devices instead of expensive boost converters, all currents through multi-channel LEDs can be well balanced. Therefore, the proposed LED driver features a small system size, improved efficiency, and low cost. To confirm the validity of the proposed driver, its operation and performance are verified on a prototype for a 46"" LED TV.
유방암 환자의 혈청 HER-2/neu 농도의 임상적 중요성 및 생존율과의 관련성
류동원 ( Dong Won Ryu ),최우식 ( Woo Sik Choi ),이충한 ( Chung Han Lee ) 대한임상종양학회 2010 Korean Journal of Clinical Oncology Vol.6 No.2
목적: HER-2/neu의 세포막 밖 리간드부분은 혈중내에서 쉽게 측정할 수 있다. 몇몇 보고에 의하면 혈청내의 HER-2/neu의 농도가 높은 경우 항암 화학요법에 대한 반응률이 낮은 것으로 알려져 있다. 그래서 본원의 환자를 대상으로 혈청내의 HER-2/neu의 농도의 임상적인 의미와 예후에 미치는 영향을 알아보고자 한다. 대상 및 방법: 2005년 1월부터 2006년 12월까지 유방암으로 진단 후 수술적 치료를 받은 환자 중 혈청 serum HER-2/neu가 측정되어 있는167명의 환자를 대상으로 후향적으로 조사하였다. 술 전 HER-2/neu의 농도가 15ng/ml를 기준으로 하여서 고농도군과 저농도군으로 나눴다. 양 군사이의 임상병리학적 인자는 교차분석을 통해서 비교하였으며 5년 무병생존율과 전체생존율은 Kaplan-Meier을 이용하여서 분석하였다. 결과: 평균연령은 54세였으며 평균종양의 크기는 3.2 cm이였다. 고농도군에서 병리학적으로도 HER-2/neu가 양성인 경우는 많았다..(p=0.035) 그리고 고농도군에서 에스트로젠 호르몬 수용체가 양성인 경우가 많았다.(p=0.046) 혈청의 HER-2/neu level이 무병생존율에 영향을 미쳤으며(p=0.001) 종양의 크기도 무병생존율에 영향을 미쳤다.(p=0.007) 결론: 혈청 HER-2/neu의 농도는 호르몬 수용체나 조직의 HER-2/neu의 농도와는 연관이 없었지만 무병생존율과는 연관이 있었다. 그러나 본 연구는 추적 기관이 짧아서 한계가 있다고 생각되며 향후 더 많은 수와 추적기간을 가지고 연구를 해야 할 것이다. Purpose: the extracellular ligand-domains of HER-2/neu can be detected in the bloodstream. Many reports have determined the association between increased serum HER-2/neu concentration and decreased response the chemotherapy. The aims of our study were to assess the correlation between serum HER-2/neu and clinocopathologic factors and to assess the effect of serum HER-2/neu on disease free survival rate. Materials and Methods: The study subjects, 167 women with breast cancer, were a subset of patients operated at OOO hospital from Jan 2005 to Dec 2006. Patients are grouped into 2 categories according to serum HER-2/neu determined in the preoperative serum level. Clincopathologic factors were compared with 2 categories of serum HER-2 level. Chi-square tests were used for statistical analysis. Kaplan-Meier estimates are presented for the survival and differences in survival were analyzed using log rank test. Results: The median age was 54 years, median tumor size was 3.2cm. there is no significant correlation between tumor staging and serum HER-2/neu level.(p=0.190). The number of patients with HER-2/neu positive at histopathologic report was correlated with serum HER-2/neu level.(p=0.035) and ER receptor negativity was also correlated with serum HER-2/neu.(p=0.046) The univariate analysis for prognostic factors associated with disease free survival revealed that the serum HER-2/neu as <15ng/ml, ≥15ng/ml was statically significant.(p=0.001) and tumor size as T1, T2, T3 or T4 was also statistically significant.(p=0.007) but lymph node status as N0, N1, N2 or N3 was not statistically significant.(p=0.553) Conclusion: According to our study, serum HER-2/neu was not associated with more advanced staging, ER-status, PR-status, HER-2/neu positive respectively. But there is significant association between serum HER-2/neu and 3- year disease free survival.
류동목(Dong Mok Ryu),박현욱(Hyun Wook Park),이한주(Han Joo Lee),허원실(Won Shil Huh) 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.2
The purpose of this study is to evaluate the effects of resorbable plate in the healing process of mandibular fracture. Reduction and rigid fixation was carried out on the artificial mandibular fracture site of the rabbits, using a resorbable screw, 1.5mm in diameter and 4.0mm in length, and an absorbable plate 1.5mm in thickness (LactosorbR). En block tissue specimens with plate were taken from the rabbits at 4, 6, 8, and 10 weeks intervals and specimen were observed with light microscope under the hematoxylin-eosin staining, to observe the inflammatory reaction and tissue healing process. The following conclusions were drawn: 1. The subject displayed good healing with no signs of detachment of the fixation plate. 2. At 4 weeks, the plate was covered by the connective tissue. Then at 6 weeks, bone regeneration was discovered around the plate. 3. During the period of healing, no inflammatory reaction or foreign body reaction, as a result of using resorbable plate, were observed. 4. At 8 weeks, the initial phase of the absorption of the plate was observed. Then at 10 weeks, macrophage were observed around the plate, indicating the absorption phase was in process. From the above results, it can be determined that when the resorbable plate is applied to rabbit, full recuperation occurs naturally in the absence of inflammatory reaction and foreign body reaction. The selected study is clinically valuable in proving this procedure.
류동현 ( Donghyun Ryu ),송석현 ( Seok-hyun Song ),한동욱 ( Dong-wook Han ) 한국스포츠정책과학원(구 한국스포츠개발원) 2018 체육과학연구 Vol.29 No.2
[목적] 본 연구는 배드민턴 서브 수행 시 숙련자와 초보자간에 어떠한 시각탐색 전략의 차이가 있는지를 밝히는데 그 목적이 있다. [방법] 배드민턴 선수 경력 10년 이상의 숙련자와 배드민턴 경력 6개월 이내의 초보자들이 본 실험에 참여하였으며, 모든 피험자는 두 가지 종류의 서브 (숏서브, 롱서브)를 각각 15회씩, 총 30회 시행하였다. 이 과정에서 피험자의 안구 움직임을 기록하였으며, 피험자의 시선고정 시간, 시선고정 위치, 마지막 시선고정 시간과 위치, 시선엔트로피를 분석하여 배드민턴 숙련성에 따른 시각탐색의 차이를 살펴보았다. [결과] 첫째, 평균 시선고정 시간의 경우에는 숙련자와 초보자 간에 차이가 나지 않았다. 시선고정 위치에 대한 분석결과, 전체적으로는 숏서브의 경우에는 네트에 대한 시선고정이 롱서브의 경우에는 윗공간에 대한 시선고정이 많이 이루어지는 것으로 나타났다. 그리고 숙련자의 경우에는 초보자보다 롱서브시 윗공간을 많이 보는 것으로 나타났으며, 숏서브의 경우에는 네트와 상대라켓에 대한 시선고정이 많은 것으로 나타났다. 하지만 초보자의 경우에는 숏서브시 셔틀콕이 착지하는 착지점에 시선고정이 많이 이루어지는 것으로 나타났다. 마지막 시선고정 위치와 시간의 경우에는 숙련자와 초보자간에 차이가 없었으며, 숏서브에서는 네트 영역에 시선고정 횟수가 많았으며, 롱서브의 경우에는 공간, 목표점, 셔틀콕에 대한 마지막 시선고정 횟수가 더 많은 것으로 나타났다. 마지막으로, 숙련자의 시선 엔트로피 값이 초보자보다 더 높은 것으로 나타났다. [결론] 본 연구를 통해 숙련자의 경우에는 숏 서브시에 네트를 집중적으로 보며, 롱 서브시에는 윗 공간을 초보자보다 훨씬 많이 보는 것으로 나타났다. 그리고 숙련자가 초보자보다 상황에 따라서 더 다양한 시선 움직임 패턴을 보이는 것으로 나타났다. [Purpose] The purpose of this study was to examine the differences in visual search strategies between expert and novice badminton players while performing badminton serve. [Method] To this end, expert (more than 10 years experience) and novice (less than 6 months experience) badminton players performed 15 trials of two types of serve (i.e., short-serve and long-serve), in total 30 trials. All the participants’ eye movement was recorded during each trial, and mean fixation duration, fixation distribution, final fixation duration and location, and gaze entropy were analyzed. [Results] The results showed that there was no difference in mean fixation duration between expert and novice players. The analysis of mean fixation duration on each location showed that participants fixated more on the net while doing short serve whereas fixated more on the space when they did long serve. In particular, expert players fixated more on the space while doing long serve than novice players, and fixated more on the net and racquet for the short serve. However, novice players fixated more on the location of shuttle would be landed. The final fixation duration was not different between expert and novice players. Further, expert players showed higher gaze entropy than novice players. [Conclusions] The findings indicate that expert players fixated more on the net for the short serve, and the space for the long serve, and visual search strategies of experts were more varied than novice players.
올브라이트 유전성 골이영양증의 진단에 실마리가 된 피부 골종
류동진 ( Dong Jin Ryu ),오상호 ( Sang Ho Oh ),한은천 ( Eun Chun Han ),배병기 ( Byung Gi Bae ),이주희 ( Ju Hee Lee ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.4
Albright`s hereditary osteodystrophy (AHO) has a broad spectrum of physical findings, including short stature, flattened nasal bridge, round facies, obesity, skeletal anomalies of the hands with brachydactyly, osteoma cutis, mental retardation, dental defects, cataracts, and calcification in the basal ganglia. It also includes endocrinologic abnormalities such as pseudohypoparathyroidism and pseudopseudohypoparathyroidism. Primary osteoma cutis, which can precede other physical findings of AHO, might be a diagnostic clue for AHO. Therefore, close follow-up and regular laboratory tests should be done to detect the early development of AHO in young children with primary osteoma cutis. Early diagnosis and treatment of AHO can prevent irreversible mental retardation and developmental delay. (Korean J Dermatol 2009;47(4):435~438)
복막투석 : MCP-1이 인간 복막중피세포의 상피-중간엽 이행 (epithelial-mesenchymal transition)에 미치는 영향
류동열 ( Dong Ryeol Ryu ),이금희 ( Jin Ji Lee ),유태현 ( Tae Hyun Yoo ),한승혁 ( Seung Hyeok Han ),김승정 ( Seung Jung Kim ),강덕희 ( Duk Hee Kang ),최규복 ( Kyu Bok Choi ),윤견일 ( Kyun Il Yoon ),강신욱 ( Shin Wook Kang ) 대한신장학회 2008 춘계학술대회 초록집 Vol.28 No.1