Tracking of Moving Objects Using Bayes Decision and Cluster Model

Woosung Chung,Ji Woong Choi,Youngho Choi,Jaecheol Lee,Kyu Tae Park 대한전자공학회 1998 International Conference on Electronics, Informati Vol.1998 No.8

무인이동체 적용 매립형 빔패턴 향상 마이크로스트립 패치 안테나 설계

정우성(Woosung Chung),최세아(Seah Choi) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.11

CXCL5 abundant in the wound fluid at the late phase of wound healing, possibly promoting migration of mesenchymal stem cells and vascular tube formation

Chung, Eunkyung,Ahn, Woosung,Son, Youngsook 한국조직공학과 재생의학회 2014 조직공학과 재생의학 Vol.11 No.4

Stretchable triboelectric multimodal tactile interface simultaneously recognizing various dynamic body motions

Choi, Woosung,Yun, Inyeol,Jeung, Jinpyeo,Park, Yun Sung,Cho, Sunghwan,Kim, Dong Wook,Kang, In Seok,Chung, Yoonyoung,Jeong, Unyong Elsevier 2019 Nano energy Vol.56 No.-

<P><B>Abstract</B></P> <P>Human cutaneous tactile receptors are deformable, and can distinguish touch, strain, relative moving distance, and relative moving velocity. In addition, the tactile potential is self-activated when external stimulation is exerted and the potential is transmitted to the nerve system, resembling the wake-up function in electronic devices. In this study, we mimic such characteristics of the human tactile receptors. We designed a stretchable triboelectric nanogenerator (TENG) for the stimuli-responsive potential generator. The TENG device has a multilayer structure independently recognizing lateral strain by the sliding mode, touch by the contact mode, the relative moving distance, and the relative moving velocity. In addition, the device design allows simultaneous sensing of strain and touch without signal interference. The self-triggered potentials generated by various body motions such as touching, joint bending, and the combinations turn on a sleeping microcontroller unit (MCU) and are used as the distinct motion signals. This study demonstrates a wearable low-power remote tactile interface that controls the 3D movements of a mobile device (drone) by the body motions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The TENG sensor can distinguish pressure, strain, distance, velocity. </LI> <LI> The sensor can extract information from random dynamic motions. </LI> <LI> The integrated wearable haptic interface can control complex 3-D movement of a drone. </LI> <LI> The wake-up function is turned on or off by the sensor signal itself. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

연령이 직무만족에 미치는 영향

정효채(Chung, Hyochae),석진홍(Suk, Jinhong),박우성(Park, Woosung) 한국노동연구원 2013 노동정책연구 Vol.13 No.2

본 연구는 연령이 직무만족에 미치는 영향을 이론적으로 검토하고, 실증적으로 검증하는 데 목적이 있다. 이를 위해 연령과 직무만족 사이의 관계를 사회 정서적 선택 이론(Socioemotional Selectivity Theory)의 관점을 통해 설명하였으며, 잠재성장모형(LGM : Latent Growth Model)을 이용하여 종단적으로 검증하였다. 본 연구에서는 2006, 2008, 2010년 고령화연구패널조사(KLoSA) 자료에서 추출한 929명의 임금근로자를 표본으로 연령과 직무만족 사이의 관계를 검증하였다. 분석 결과, 직무만족은 시간의 흐름에 따라 선형으로 증가하였고, 연령은 직무만족에 긍정적인 영향을 미치는 것으로 나타났다. 즉 연령이 높을수록 직무만족이 높으며, 직무만족은 시간의 흐름에 따라 선형으로 증가하므로 연령이 낮은 근로자에 비해 연령이 높은 근로자가 직무만족이 높다는 것을 알수 있다. 이러한 연구결과는 고령화된 임금근로자의 특성을 이해하는 첫걸음으로서 중ㆍ고령 임금근로자의 심리적 특성의 변화와 직무태도에 대한 중요한 단서를 제공하고 있다. This study has a purpose of examining the effect of Age on Job Satisfaction through Socio-emotional selectivity Theory perspective and Using Latent Growth Modeling for Longitudinal research design. In this paper, we select 929 employees from KLoSA(Korean Longitudinal study of Ageing) panel data at 2006, 2008, 2010. Our analysis shows that Job satisfaction is positive linear relationship with age the passage of time. As predicted, our findings support that age is positively influence with Job Satisfaction. This phenomenon is well explained through the theory of Socio-emotional selectivity theory perspective. This study examined that aged worker’s psychological changes after it affects to job attitude. This study is the first step for understanding aging workers that can give useful evidence for managing HR in aged society.

마늘의 萌芽 및 뿌리의 生長에 있어서의 Maleic Hydrazide와 生長調節劑間의 相互作用에 대하여

鄭凞敦(Chung Heedon),李愚升(Lee Woosung),李鍾弼(Lee Jongphill) 한국원예학회 1973 Horticulture, Environment, and Biotechnology Vol.14 No.-

데이터 샘플링 기반 프루닝 기법을 도입한 효율적인 각도 기반 공간 분할 병렬 스카이라인 질의 처리 기법

최우성 ( Woosung Choi ),김민석 ( Minseok Kim ),( Gromyko Diana ),정재화 ( Jaehwa Chung ),정순영 ( Soonyong Jung ) 한국정보처리학회 2017 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.6 No.1

다기준 의사결정 시 활용할 수 있는 스카이라인 질의는 다수의 선택지 중에서 사용자가 `선호하지 않을 만한`(uninteresting) 선택지를 제거 함으로써 사용자가 검토해야 하는 선택지의 수를 대폭 감소시키기 때문에 대용량 데이터 분석 시 매우 유용하게 활용될 수 있다. 이러한 배경에서 대용량 데이터에 대한 스카이라인 질의를 분산ㆍ병렬 처리하는 기법이 각광을 받고 있으며, 특히 맵리듀스(MapReduce) 기반의 분산ㆍ병렬 처리 기법 연구가 활발히 진행되어 왔다. 맵리듀스 기반 알고리즘의 병렬성 제고를 위해서는 부하 불균등 문제ㆍ중복 계산 문제ㆍ과다한 네트워크 비용 발생 문제를 해소해야 한다. 본 논문에서는 부하 불균등 문제와 중복 계산 문제를 해소하면서도 데이터 샘플링 기반 프루닝을 통해 네트워크 비용 절감 시킬 수 있는 맵리듀스 기반 병렬 스카이라인 질의 처리 기법인 MR-SEAP(MapReduce sample Skyline object Equality Angular Partitioning)을 소개한다. 또한 다양한 관점에서의 실험 평가함으로써 제안 기법의 효용성을 다방면으로 검증했다. Given a multi-dimensional dataset of tuples, a skyline query returns a subset of tuples which are not `dominated` by any other tuples. Skyline query is very useful in Big data analysis since it filters out uninteresting items. Much interest was devoted to the MapReduce-based parallel processing of skyline queries in large-scale distributed environment. There are three requirements to improve parallelism in MapReduced-based algorithms: (1) workload should be well balanced (2) avoid redundant computations (3) Optimize network communication cost. In this paper, we introduce MR-SEAP (MapReduce sample Skyline object Equality Angular Partitioning), an efficient angular space partitioning based skyline query processing using sampling-based pruning, which satisfies requirements above. We conduct an extensive experiment to evaluate MR-SEAP.

스마트 워크를 통한 조직혁신

정효채(Hyochae Chung),이병하(Byungha Lee),박우성(Woosung Park) 한국경영학회 2016 Korea Business Review Vol.20 No.1

스마트 워크는 정보통신기술의 발전을 통해 시간과 장소의 유연성을 극대화 한 근무형태 또는 환경으로 궁극적으로 조직의 생산성을 향상하기 위한 혁신활동으로 볼 수 있다. 최근 스마트 워크에 대한 폭발적 관심에도 불구하고 스마트 워크가 어떻게 기업현장에서 적용되고 있으며, 또한 이를 통해 어떤 효과가 나타나는지에 대한 연구가 매우 부족한 실정이다. 따라서 본 연구에서는 스마트 워크를 추진하는 기업을 통해 스마트 워크의 동기와 실행과정, 성과, 향후과제 등에 대한 질문에 답하려는 목적을 갖고 있다. 또한 본 연구는 스마트 워크의 효과를 심층적으로 파악하기 위해 참여관찰 방법을 활용하여 스마트 워크가 작업환경에 미치는 영향이나 종업원들의 반응을 구체적으로 검토하고 있다. 사례기업인 이트너스는 전략적 공간관리의 관점에서 스마트 오피스라는 혁신적인 사무공간을 조성하고, 그와 관련된 다양한 제도와 시스템을 도입하고 활용하였으며 이를 기업 브랜드 이미지 제고에도 연결시키는 통합적인 스마트 워크를 추진하였다. 이트너스는 스마트 오피스를 도입하여 종업원 및 부서 단위의 의사소통을 크게 향상시켰으며, 스마트 워크와 관련된 시간관리 및 기술도입을 통해 종업원의 만족과 조직 정체성을 높일 수 있었다. 그러한 성과는 스마트 워크에 대한 경영진의 확고한 추진의지 및 조직 내에서 적극적인 교육훈련에 기인한 바 크다. 본 사례에서는 스마트 워크를 공간, 시간, ICT 기술의 세가지 측면에서 살펴보았으며, 그러한 과정에서 나타나는 작업조직 및 종업원의 태도 변화를 포괄적으로 관찰했다. 본 연구는 질적 연구방법을 활용하여 스마트 워크의 도입과정 및 성과를 과정적인 측면에서 검토하였으며, 향후 스마트 워크의 효과를 높이기 위한 성공조건이나 향후 과제를 깊이있게 논의 할 수 있는 기반을 제공하였다는데 의의가 있다. Smart Work is defined as innovative behavior ultimately aimed to improve productivity of an organization through maximizing flexibility of working environments realized with development of information communication technology. Notwithstanding the current high interest in Smart Work, the studies that support to explain how these attempts are applied in enterprise field and its effectiveness are insufficient. Therefore, in this case study we examined Etners, which strategically adopted Smart Work, with participatory observation. By using this method, we could observe parts that were difficult to catch only with surveys or interviews and reported on Etners Smart work of motivation, execution process, outcome, and henceforth tasks with specific suggestions. Exemplary company, Etners, built innovative office area called Smart Office in respect of strategic management of spaces. It also promoted integrated Smart Work by introducing and utilizing related systems and policies and using these efforts to Company’s image promotion. This significantly improved communication between employees and working divisions and heightened employee satisfaction and group identity through time management skills and technology related to Smart Work. Additionally, we discovered the existence of firm will of board of directors to propel successful Smart Work system and vigorous training within organization in this close observation. Etners, in this case, pursued integrated Smart Work innovation that encompasses space, time, ICT technology and we studied comprehensive phenomenon in this development progress. Therefore this case study as a research that adopted qualitative examination method in Smart Work’s beginning stage, presents implication as follows. Above all, in perspective of operational level, we considered introduction course of Smart Work and its dynamics. Because there is only a few cases that adopted integrated Smart Work system, our case will be able to offer various information that companies which considers adopting it need. This includes information about management of spaces and overall Smart Work processes. Finally, we provided groundwork of various discussions about effectiveness of Smart Work. Especially, our research gave attention to Smart Work’s effectiveness in HR’s perspective and possibilities that might affect company result through organizational commitment.

Classification of schizophrenia and normal controls using 3D convolutional neural network and outcome visualization

Oh, Kanghan,Kim, Woosung,Shen, Guangfan,Piao, Yanhong,Kang, Nam-In,Oh, Il-Seok,Chung, Young Chul Elsevier 2019 SCHIZOPHRENIA RESEARCH Vol.212 No.-

<P><B>Abstract</B></P> <P><B>Background</B></P> <P>The recent deep learning-based studies on the classification of schizophrenia (SCZ) using MRI data rely on manual extraction of feature vector, which destroys the 3D structure of MRI data. In order to both identify SCZ and find relevant biomarkers, preserving the 3D structure in classification pipeline is critical.</P> <P><B>Objectives</B></P> <P>The present study investigated whether the proposed 3D convolutional neural network (CNN) model produces higher accuracy compared to the support vector machine (SVM) and other 3D-CNN models in distinguishing individuals with SCZ spectrum disorders (SSDs) from healthy controls. We sought to construct saliency map using class saliency visualization (CSV) method.</P> <P><B>Methods</B></P> <P>Task-based fMRI data were obtained from 103 patients with SSDs and 41 normal controls. To preserve spatial locality, we used 3D activation map as input for the 3D convolutional autoencoder (3D-CAE)-based CNN model. Data on 62 patients with SSDs were used for unsupervised pretraining with 3D-CAE. Data on the remaining 41 patients and 41 normal controls were processed for training and testing with CNN. The performance of our model was analyzed and compared with SVM and other 3D-CNN models. The learned CNN model was visualized using CSV method.</P> <P><B>Results</B></P> <P>Using task-based fMRI data, our model achieved 84.15%∼84.43% classification accuracies, outperforming SVM and other 3D-CNN models. The inferior and middle temporal lobes were identified as key regions for classification.</P> <P><B>Conclusions</B></P> <P>Our findings suggest that the proposed 3D-CAE-based CNN can classify patients with SSDs and controls with higher accuracy compared to other models. Visualization of salient regions provides important clinical information.</P>

Bond characteristics of near-surface-mounted anchorage for prestressing

Lee, Heeyoung,Lee, Woosung,Jung, Woo Tai,Chung, Wonseok Elsevier 2017 Construction and Building Materials Vol.148 No.-

<P><B>Abstract</B></P> <P>The external bonds of carbon fiber reinforced polymers (CFRP) used to strengthen structures are known to be vulnerable to delamination. To prevent FRP delamination and efficiently strengthen structures, post-tension CFRP rods are installed for near-surface-mounted (NSM) strengthening. For post-tensioning, grouted anchorage systems have been applied to the NSM strengthening technique. The bond behavior between the CFRP rods and the filler in the anchorage for the post-tension rods should be investigated. This study evaluates the behavior and failure characteristics of bond-type anchorage systems based on the results of 40 pullout tests with different mortar fillers and diameters of the anchorage sleeve. The optimum mortar filler strength and sleeve diameters have been proposed to ensure proper bond behavior in NSM anchorage systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new grouted anchorage system is applied to the NSM strengthening technique. </LI> <LI> The bond behavior of anchorage for the post-tension method was investigated. </LI> <LI> 40 pullout tests with different fillers and diameters of the anchorage were conducted. </LI> <LI> Behavior and failure characteristics of tested anchorage systems were examined. </LI> <LI> The optimum mortar filler strength and sleeve diameters were proposed. </LI> </UL> </P>