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최우성,신헌철,Choi, Woo-Sung,Shin, Heon-Cheol 한국전기화학회 2010 한국전기화학회지 Vol.13 No.4
기공 경사화된 마이크론 단위의 구조 틀 및 나노 수지상 구조 벽을 가지는 니켈-구리 거품 전극을 전기화학적인 방법으로 합성하였다. 전해 도금 시 순수한 니켈은 치밀한 층으로 성장하는 양상을 보였으나, 구리와 함께 도금시키는 경우 그 성장 양상이 순수한 니켈과는 매우 다르게 관찰되었다. 특히, 첨가제로써 염소 이온의 농도가 증가함에 따라 니켈-구리 도금 층의 수지상 성장이 뚜렷해지는 모습을 보였다. 또한, 기재와 먼 부분일수록 도금 층 내 구리 대비 니켈의 상대적인 양이 감소하였으며, 염소 이온 농도가 높아짐에 따라 전 도금 층에 걸쳐 니켈의 양이 증가하였다. 수지상 구조 벽의 가지 내부 조성을 분석한 결과, 중심부로 갈수록 구리 함량이 점차 높아지는 조성 구배를 확인하였으며, 적절한 열처리를 통해 상호 확산을 유도하여 균일한 조성의 니켈-구리 합금을 얻어낼 수 있었다. 본 연구를 통해 제작된 재료는 기능성 전기 화학 장치용 고성능 전극에 활용될 수 있을 것으로 기대된다. Nickel-copper foam electrodes with pore gradient micro framework and nano-ramified wall have been prepared by using an electrochemical deposition process. Growth habit of nickel-copper co-deposits was quite different from that of pure nickel deposit. In particular, the ramified structure of the individual particles was getting clear with chloride ion content in the electrolyte. The ratio of nickel to copper in the deposits decreased with the distance away from the substrate and the more chloride ions in the electrolyte led to the more nickel content throughout the deposits. Compositional analysis for the cross section of a ramified branch, together with tactical selective copper etching, proved that the copper content increased with approaching central region of the cross section. Such a composition gradient actually disappeared after heat treatment. It is anticipated that the pore gradient nickel-copper nanostructured foams presented in this work might be a promising option for the high-performance electrode in functional electrochemical devices.
족부의 종양성 석회증 -자기 공명 영상 및 조직학적 소견의 2예 증례 보고-
최우성,지종훈,이연수,모하메드샤피,최광영,김원유,오세철,Choi, Woo-Sung,Ji, Jong-Hun,Lee, Yeon-Soo,Shafi, Mohamed,Choi, Kwang-Young,Kim, Won-Yoo,Oh, Sae-Cheal 대한족부족관절학회 2004 대한족부족관절학회지 Vol.8 No.2
Tumoral calcinosis is rarely encountered disease, and most of reported cases involved large joints such as hip or elbow. We report two patients with tumoral calcinosis in the foot. In the 1st case, the lesion was observed at the 1st MP joint of foot, and in the 2nd case it was found at the DIP joint of 5th toe area with bony erosion which is rare in other tumoral calcinosis. They all needed evaluation with MRI, and eventually surgical excision.
명암 가중치를 이용한 반복 수렴 공간 모멘트기반 눈동자의 시선 추적
최우성,이규원,Choi, Woo-Sung,Lee, Kyu-Won 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.5
본 논문에서는 명암 가중치를 적용한 반복 공간 모멘트를 이용하여 복잡한 배경에서 사용자의 눈을 정확히 추출하고 추적할 수 있는 눈 추적 시스템을 제안한다. CCD 카메라를 활용하여 촬영한 입력영상으로부터 눈 영역을 찾기 전에 관심영역을 최소화하기 위하여 Haar-like feature를 이용하여 얼굴영역을 검출한다. 그리고 주성분 분석의 고유 얼굴 기반인 고유 눈을 이용하여 눈 영역을 검출 한다. 또한 눈 영역에서 가장 어두운 부분으로부터 눈의 좌 우 상 하 끝점인 특징 점을 찾고, 명암 가중치를 적용한 반복 수렴 공간 모멘트를 이용하여 정확한 눈동자의 시선추적을 확인하였다. In this paper, an eye tracking method is presented by using on iterated spatial moment adapting weighted gray level that can accurately detect and track user's eyes under the complicated background. The region of face is detected by using Haar-like feature before extracting region of eyes to minimize an region of interest from the input picture of CCD camera. And the region of eyes is detected by using eigeneye based on the eigenface of Principal component analysis. Also, feature points of eyes are detected from darkest part in the region of eyes. The tracking of eyes is achieved correctly by using iterated spatial moment adapting weighted gray level.
경구 bisphosphonate를 복용하는 환자에서 발생한 bisphosphonate-related osteonecrosis of jaw에 대한 임상적 특징 및 처치: 증례보고
최우성,윤현중,이상화,Choi, Woo-Sung,Yoon, Hyun-Joong,Lee, Sang-Hwa 대한구강악안면외과학회 2010 대한구강악안면외과학회지 Vol.36 No.6
Bisphosphonates are used effectively for many medical conditions, such as multiple myeloma, Paget's disease, osteoporosis, etc. However, recently, osteonecrosis of the jaw was observed in patients receiving long-term bisphosphonate therapy, including oral administration. This osteonecrosis is refractory, and complete recovery is not guaranteed despite a standard treatment protocol being established by many associations related to oral and maxillofacial surgery. The treatment outcome of oral bisphosphonate-related osteonecrosis of jaw (BRONJ) is reported with a review of the relevant literature.
다중의도 동시 예측을 통한 다기능 뇌-컴퓨터 인터페이스
최우성(Woo Sung Choi),염홍기(Hong Gi Yeom) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
The Brain-Computer Interface (BCI) allows individuals with disabilities to communicate or control electronic devices by interpreting neural signals. While BCI systems have proven to be useful, previous models have been limited to predict only one type of intention. In order for BCI users to achieve independence and live without relying on others, the BCI system must be capable of predicting multiple intentions. In this paper, we present a multi-functional BCI system that can predict multiple intentions simultaneously. Furthermore, we present the BCI system uses augmented reality (AR) for visual presentation to reduce the inconvenience caused by a screen in daily life.
보행 중 스마트폰을 이용한 이중과제의 혼란수준이 만성 발목불안정성 성인의 보행에 미치는 영향
최우성 ( Woo-sung Choi ),최종덕 ( Jong-duk Choi ) 대한물리의학회 2020 대한물리의학회지 Vol.15 No.3
PURPOSE: This study examined the effects of the confusion level in performing dual tasks using smartphones while walking in subjects with chronic ankle instability (CAI). METHODS: Twenty subjects with CAI and 20 healthy subjects participated in the study. The spatial, temporal, spatial-temporal, and variability gait parameters were measured using GAITRite under four different conditions: general gait, web surfing during gait, texting during gait, and gaming during gait. Two-way repeated-measures analysis of variance was used to analyze the interaction according to the group (2) and confusion level in dual-tasks (4). One-way repeated-measures analysis of variance was used to compare the changes within the group according to the confusion level in dual-tasks. The changes between groups were compared using an independent t-test. The statistical significance level was set to p = .05. RESULTS: Significant interactions in the temporal and spatial-temporal gait parameters were found between the dual-task conditions and the other groups (p < .05). Significant within-group differences in the spatial, temporal, and spatial-temporal gait parameters were found according to the confusion level in dual tasks (p < .05). Significant betweengroup differences were observed in the temporal and spatial-temporal gait parameters according to the confusion level in dual tasks (p < .05). CONCLUSION: The effect of the confusion level in dual tasks was greater in subjects with CAI than in healthy individuals. This study suggests that to prevent reinjury to the ankle, subjects with CAI should avoid dual tasks such as using smartphones while walking.
발전설비 최적 정비를 위한 독립형 위험도 평가 소프트웨어 개발
최우성(Woo Sung Choi),송기욱(Gee Wook Song),김범신(Bum Shin Kim),장성호(Sung Ho Chang),이상민(Sang Min Lee) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.11
위험도 평가 기술은 주로 플랜트의 많은 운영설비 중 대형사고나 피해를 유발할 수 있는 위험설비를 선별하는 목적으로 개발되었다. 현재 발전소에 설치되어 있는 설비관리시스템에는 초기 버전의 위험도 평가모듈이 설치되어 있으나 문진 위주로 구성되어 통계적 기법에 기반을 둔 고장 확률 평가보다는 평가자의 주관적인 판단에 따라 평가 결과가 좌우되었다. 또한 발전회사 서버에 기반하였기 때문에 평가자가 공간 및 시간의 제약을 받을 수 밖에 없고 현장 활용에 한계가 있었다. 본 논문에서는 문진 대신 해석적 분석을 이용한 기본 고장확률을 계산하고 현장 검사 결과 및 검사 효용도를 분석할 수 있는 독립형 위험도 평가 소프트웨어를 개발하였다. 독립형으로 현장 운용이 가능하며 최적 정비주기 예측 및 현장검사 결과에 대한 입출력 기능이 있기 때문에 정비에 직접 참여하는 현장 사용자뿐만 아니라 발전 설비의 수명연장 및 교체를 결정해야 하는 엔지니어에게 유용한 정보를 제공할 것이다. Risk-Risk-based inspection (RBI) has been developed in order to identify risky equipments that can cause major accidents or damages in large-scale plants. This assessment evaluates the equipment"s risk, categorizes their priorities based on risk level, and then determines the urgency of their maintenance or allocates maintenance resources. An earlier version of the risk-based assessment software is already installed within the equipment management system; however, the assessment is based on examination by an inspector, and the results can be influenced by his subjective judgment, rather than assessment being based on failure probability. Moreover, the system is housed within a server, which limits the inspector"s work space and time, and such a system can be used only on site. In this paper, the development of independent risk-based assessment software is introduced; this software calculates the failure probability by an analytical method, and analyzes the field inspection results, as well as inspection effectiveness. It can also operate on site, since it can be installed on an independent platform, and has the ability to generate an I/O function for the field inspection results regarding the period for an optimum maintenance cycle. This program will provide useful information not only to the field users who are participating in maintenance, but also to the engineers who need to decide whether to extend the lifecycle of the power machinery or replace only specific components.