http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
심층 신경망의 영상 인식 분류 성능 균일성 향상을 위한 명시적 상호보완 앙상블 구조
김도현(Dohyun Kim),김중헌(Joongheon Kim) 한국정보과학회 2019 정보과학회논문지 Vol.46 No.9
본 논문에서는 영상 인식 분류 시스템의 주요한 성능평가 고려사항 중 하나인 분류 대상 별 성능 편차문제를 완화시키기 위한 새로운 심층 신경망 기반 조화 앙상블(Harmony) 기법을 제안한다. 조화 앙상블 기법은 표적 모델(Target model), 보완 모델(Complementary model) 그리고 지휘자 모델(Conductor model)로 명명된 3가지의 하위 모듈들로 구성된다. 제안하는 기법에서의 분류 대상은 지휘자 모델에서의 결과에 따라 표적 모델 또는 보완 모델을 통해 선택적으로 처리된다. 표적 모델은 종래의 분류모델과 동일한 방식으로 학습된다. 반면에 보완 모델은 표적 모델의 취약한 분류 대상에 대하여 상호보완적인 분류 성능을 가지도록 학습된다. 지휘자 모델은 분류 대상이 표적 모델의 취약 분류대상에 속하는지를 사전에 분류하여 분류대상을 표적 모델과 보완 모델 중에 어떤 모델을 사용하여 분류 할 것인지를 결정한다. 논문의 끝에서는 실험적 결과를 통하여 제안하는 조화 앙상블 기법을 통해 평균 분류성능의 대한 손실 없이 분류 대상 별 성능 편차문제를 효과적으로 완화시킬 수 있음을 확인한다. One of the major evaluation metrics for classification systems is average accuracy, while accuracy deviation is another important performance metric used to evaluate various deep neural networks. In this paper, we present a new ensemble-like fast deep neural network, Harmony, that can reduce the accuracy deviation among categories without degrading the overall average accuracy. Harmony consists of three sub-models: the Target model, Complementary model, and Conductor model. In Harmony, an object is classified by using either the Target model or the Complementary model. The Target model is a conventional classification network for general categories, while the Complementary model is a classification network specifically for weak categories that are inaccurately classified by the Target model. The Conductor model is used to select one of the two models. The experimental results indicate that Harmony accurately classifies categories and also, reduces the accuracy deviation among the categories.
Kim, Yikwon,Kang, MeeJoo,Han, Dohyun,Kim, Hyunsoo,Lee, KyoungBun,Kim, Sun-Whe,Kim, Yongkang,Park, Taesung,Jang, Jin-Young,Kim, Youngsoo American Chemical Society 2016 JOURNAL OF PROTEOME RESEARCH Vol.15 No.1
<P>Intraductal papillary mucinous neoplasm (IPMN) is a common precursor of pancreatic cancer (PC). Much clinical attention has been directed toward IPMNs due to the increase in the prevalence of PC. The diagnosis of IPMN depends primarily on a radiological examination, but the diagnostic accuracy of this tool is not satisfactory, necessitating the development of accurate diagnostic biomarkers for IPMN to prevent PC. Recently, high-throughput targeted proteomic quantification methods have accelerated the discovery of biomarkers, rendering them powerful platforms for the evolution of IPMN diagnostic biomarkers. In this study, a robust multiple reaction monitoring (MRM) pipeline was applied to discovery and verify IPMN biomarker candidates in a large cohort of plasma samples. Through highly reproducible MRM assays and a stringent statistical analysis, 11 proteins were selected as IPMN marker candidates with high confidence in 184 plasma samples, comprising a training (n = 84) and test set (n = 100). To improve the discriminatory power, we constructed a six-protein panel by combining marker candidates. The multimarker panel had high discriminatory power in distinguishing between IPMN and controls, including other benign diseases. Consequently, the diagnostic accuracy of IPMN can be improved dramatically with this novel plasma-based panel in combination with a radiological examination.</P>
Kim, Dohyun,Kim, Sunil,Song, Minju,Kang, Dae Ryong,Kohli, Meetu R.,Kim, Euiseong Elsevier 2018 JOURNAL OF ENDODONTICS - Vol.44 No.11
<P><B>Abstract</B></P> <P><B>Introduction</B></P> <P>The purpose of this retrospective study was to evaluate and compare the outcome of endodontic micro-resurgery with that of primary endodontic microsurgery and determine prognostic factors affecting the outcome of micro-resurgery.</P> <P><B>Methods</B></P> <P>A clinical database was searched for endodontic microsurgery cases between 2001 and 2016. Nearest neighbor 2:1 propensity score matching for the following 5 variables was performed for cases of primary microsurgery and those of micro-resurgery: age, sex, tooth type, lesion type, and postoperative restoration. For the matched cases, the outcome was categorized as success or failure according to clinical and radiographic evaluations performed at least 1 year after surgery. Kaplan-Meier survival analysis and log-rank tests were performed to compare the outcome of primary microsurgery with that of micro-resurgery over time. For the micro-resurgery group, multivariate Cox proportional hazard regression analysis was performed to identify prognostic factors and estimate their effects.</P> <P><B>Results</B></P> <P>In total, 571 cases of endodontic microsurgery (498 primary microsurgery and 73 micro-resurgery cases) were identified, and 146 cases of primary microsurgery were matched to 73 cases of micro-resurgery through 2:1 propensity score matching. After matching, all covariates demonstrated an absolute standardized difference of <0.1. The estimated 5-year success rates were 91.6% and 87.6% for primary microsurgery and micro-resurgery, respectively (<I>P</I> = .594). The tooth type was found to be the only contributing factor for the outcome of micro-resurgery, with molars showing a higher probability of failure than anterior teeth (hazard ratio, 8.53; <I>P</I> = .002).</P> <P><B>Conclusions</B></P> <P>Within the limitations, the findings of this study suggest that the outcome of endodontic micro-resurgery is comparable with that of primary endodontic microsurgery.</P>
김도현(Dohyun Kim),김청균(Chungkyun Kim),김영규(Younggyu Kim) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
The O-ring seal is a essential component part in various mechanical apparatuses for the sealing. The contact force of O-rings is effected in environments of the O-ring seal, like that applied pressures, working temperatures and materials. Particularly the material of O-rings is a very important factor in severe condition such as high temperatures. But materials are properly selected because of the cost. So Bi-polymer O-rings that can satisfy both the mechanical characteristic and costs are proposed in this study. And the difference of the contact force of Bi-polymer O-rings and conventional O-rings with temperatures is found.
종이접기와 키리가미 이론에 기반한 3차원 T-자형 다이폴 안테나 설계
김도현(Dohyun Kim),김경득(Gyoungdeuk Kim),정현민(Hyunmin Jeong),최우혁(Woohyeok Choi),하노겸(Nohgyeom Ha),황명하(Myeongha Hwang),김상길(Sangkil Kim) 한국전자파학회 2021 한국전자파학회논문지 Vol.32 No.8
본 논문은 종이접기와 키리가미 이론을 응용하여 단일 평면기판에 접을 수 있는 3차원 T-자형 다이폴 안테나를 설계했다. 종이접기와 키리가미 기술의 2차원 공간을 3차원으로 매핑하는 이론을 기반으로 하여 Lamina Emergent Torsional(LET) 관절 구조를 0.5 mm 두께의 FR4 기판에 적용하였으며, 단일 기판에 인쇄된 T-자형 다이폴 안테나를 접어서 세울 수 있도록 설계했다. 제안하는 T-자형 다이폴 안테나는 마이크로스트립 전송선로의 전기적 커플링을 통해서 급전되어 20 %의 비대역폭(2.7~3.3 GHz)을 가지며, 상대적으로 높은 이득(6.5 dBi)을 가진다. In this study, the design of a 3D foldable T-shaped dipole antenna inspired by origami and kirigami theory is presented. The origamiand kirigami-inspired techniques map 2D to 3D space. Moreover, the lamina emergent torsional (LET) joint is designed to fold the planar structure. The proposed antenna, including the LET joint, is printed on a planar 0.5 mm thick FR4 substrate. The proposed antenna is fed by a capacitively coupled microstrip line to achieve a 20 % fractional bandwidth (2.7~3.3 GHz), with a measured antenna gain value of 6.5 dBi.
김태환(Taehwan Kim),김한구(Hangoo Kim),김도현(Dohyun Kim),김청균(Chungkyun Kim) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
This paper presents the numerical results of the contact force and durability with optimized design of lip seal. Using the finite element method based on the Ogden model, the contact force and durability of lip seals were analyzed to illuminate the effect of various shaft interferences and the shape of lip seals. And the optimized design is performed through the Taguchi method. The results show that No.5 model is the best model. And the interference, angle and displacement(d) is important factors.