일부 농촌 지역 장애인의 일상 생활 동작 평가

박영재,최기섭,박시복,신영전 大韓再活醫學會 1999 Annals of Rehabilitation Medicine Vol.23 No.1

Bargaining-Based Smart Grid Pricing Model for Demand Side Management Scheduling

박영재,김승욱 한국전자통신연구원 2015 ETRI Journal Vol.37 No.1

A smart grid is a modernized electrical grid that uses information about the behaviors of suppliers and consumers in an automated fashion to improve the efficiency, reliability, economics, and sustainability of the production and distribution of electricity. In the operation of a smart grid, demand side management (DSM) plays an important role in allowing customers to make informed decisions regarding their energy consumption. In addition, it helps energy providers reduce peak load demand and reshapes the load profile. In this paper, we propose a new DSM scheduling scheme that makes use of the day-ahead pricing strategy. Based on the Rubinstein–Stahl bargaining model, our pricing strategy allows consumers to make informed decisions regarding their power consumption, while reducing the peak-to-average ratio. With a simulation study, it is demonstrated that the proposed scheme can increase the sustainability of a smart grid and reduce overall operational costs.

요통 환자에서 방사선 검사와 근전도 소견의 상호 연관성

박영재,김동훈,김미정,최기섭 대한재활의학회 2005 Annals of Rehabilitation Medicine Vol.29 No.5

Objective: To determine the relations of spinal measurements on magnetic resonance imaging (MRI), myelography and electromyography (EMG) in patients with low back pain. Method: We investigated forty four patients who were underwent both imaging and electrodiagnostic evaluation. Spinal geometric measurements in axial MRI included anteroposterior (AP) diameters of canal and thecal sac, interlaminar distance, width of lateral recess, thickness of ligamentum flavum, and the findings of a root deviation. This study investigated: 1) correlation of MRI disc herniation types with EMG and myelogram findings, 2) correlation of EMG findings with axial MRI spinal measurements and myelogram findings, 3) correlation of myelogram with axialMRI spinal measurements. Results: The MRI disc herniation types did not relate to EMG and myelogram findings. Findings of the root compression on myelogram related to the width of lateral recess and thecal sac AP diameter only (p<0.05). There were nonparametric correlations between myelogram findings and the findings of root deviation on MRI (p<0.05). Conclusion: There were little correlations between EMG findings and other imaging studies. In addition, we suggest not only the disc herniation type, but also the width of lateral recess and thecal sac AP diameter is helpful in interpreting the axial spinal MRI.

Time-integrated Cumulative Parameters Predictive of Radiographic Progression of Rheumatoid Arthritis: Real-world Data From a Prospective Single-center Cohort

박영재,리 메이링,김지원,고정희,박윤정,김완욱 대한류마티스학회 2022 대한류마티스학회지 Vol.29 No.2

Objective: With many chronic inflammatory diseases, outcomes are determined by assessing both disease activity at presentation and cumulative activity over time. Here, we investigated whether cumulative activity better reflects the radiographic progression (RP) of rheumatoid arthritis (RA) than measurement of activity at a single time point. Methods: From a prospective cohort of RA patients, most of whom were treated with anti-rheumatic drugs, we selected 117 subjects for whom laboratory, clinical, and radiographic parameters potentially influencing RP were monitored serially for more than 1 year. X-ray images of both hands and both feet were scored using the van der Heijde modified total Sharp score (mTSS). In addition to cross-sectional values at baseline, longitudinal and cumulative values for each parameter were calculated in a timeintegrated and averaged manner. Results: Among the values measured at baseline, mTSS, but not the baseline erythrocyte sedimentation rate (ESR) or C-reactive protein level, was associated with RP. By contrast, multivariate analyses identified cumulative values such as the cumulative ESR, cumulative tender joint count, cumulative swollen joint count (SJC), and cumulative Disease Activity Score 28-ESR as major determinants of RP. In particular, the cumulative SJC showed the best predictive performance for RP. Conclusion: This study highlights the importance of cumulative indices for predicting progression of RA. Specifically, dynamic and cumulative values of RA activity-related factors, particularly the cumulative SJC, may be the major determinants of RP in the current practice.

계란막을 이용한 화상환자의 치료에 관하여

박영재,유성희,서정욱 대한외과학회 1983 Annals of Surgical Treatment and Research(ASRT) Vol.25 No.10

상향류식 혐기성 입상슬러지 공법에 의한 전분폐수의 소화 특성

박영재,박철휘,홍승모,허관용 한국물환경학회 1994 한국물환경학회지 Vol.10 No.2

The purpose of this study is to develop the advanced and high efficient upflow anaerobic reactor and put in practical use. To achieve this purpose, we built 4 reactors. 25㎥ scale each, and brought the seeding sludge for filling the reactors from K sewage treatment plant. The reactors were designed based on labotary scale reactors performed before and operated with changing the settling compartment and GSS device. During the operation, we came to get the result of DW-process characteristics. The seperation rate of gas and solid was elevated by increasing contact area and R2, R3 and R4 reactor showed good protection efficiency of 30.2, 52.5 and 23.0% from wash-out of sludge. All of 4 reactors gave over 90% COD_(nm) efficiency, 8hr HRT 6-10㎏ COD/㎥/day OLR and over 80% methane content in gas produced in the reactors.

주문생산업체의 전자상거래 지원을 위한 에이전트의 활용

박영재,최형림,한계섭,김현수 한국경영정보학회 1998 한국경영정보학회 학술대회논문집 Vol.1998 No.-

동북아 경제중심 정책 추진에 따른 국내물류기업의 전략방안에 관한 연구

박영재,정태원 한국물류학회 2004 물류학회지 Vol.14 No.2

본 연구는 정부의 동북아 경제중심 정책 추진에 따른 물류분야의 정책 현안을 기업 입장에서 제안하여 바람직한 기업 경영환경을 조성하고, 정부의 정책변화에 발맞추어 물류기업으로서의 전략방안을 모색하는 것을 목적으로 하였다. 이를 위해서 동북아 지역의 물류체계현황을 제시하였고, 정부가 추진하는 동북아 물류중심 주요 정책을 파악하였으며, 물류기업에 대한 설문조사를 통해 물류기업의 인식 및 니즈를 분석하여 물류기업의 전략방안을 수립하였다. 설문분석 결과를 토대로 정부의 동북아 경제중심 정책 추진에 대한 물류기업의 전략방안을 제시하면 먼저, 핵심 거점의 확보와 물류네트워크 구축이 이루어져야 할 것이며, 둘째로, 우수한 인력을 확보하는 동시에 물류정보시스템 구축을 통하여 물류사업의 부가가치를 창출해야 할 것이며, 마지막으로는 제도개선을 유도하여 경쟁력 강화를 이루어나가야 할 것이다. The purpose of this paper is to propose, keeping pace with change of government policy, the strategies of domestic logistics corporate being followed by employing 'Northeast Asian Business Hub' policy. To do so it examines situation of logistics system in Northeast Asian region, looks into 'Northeast Asian Business Hub' policy of government and suggests strategies of domestic logistics corporate performing analysis based on Questionnaire to grasp their needs and recognitions. The conclusion is summarized as follows : Domestic logistics corporate need to preoccupy strategic logistics hub and its network, activate value added logistics business by ensuring a great manpower and building logistics information system simultaneously and strengthen competitive edge, leading the system improved.

Suppression of volume expansion by graphene encapsulated Co3O4 quantum dots for boosting lithium storage

박영재,Kyu Seung Lee,심재호,Jin-Hwan Lee,김연호,손동익 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-

Transition metal oxide has been attracting significant attention as a potential alternative anode materialsfor high-performance lithium-ion batteries. However, the materials still suffer from poor performancedue to the large volume expansion during reversible electrochemical reaction between the materials andLi ions. Here, we report on successfully synthesized graphene encapsulated Co3O4 (GE-Co3O4) quantumdots (QDs) by a facile chemical reaction. We also demonstrate an improved performance in Li storagewith GE/Co3O4 by suppression of volume expansion during charge/discharge processes. To evaluate theelectrochemical characteristics for the lithium storage the composites were examined by cyclicvoltammetry and charge/discharge process. The GE-Co3O4 showed a large reversible capacity of820 mA h/g at a constant current density of 1000 mAg 1 even after 100 cycles and excellent rate capacityand cyclic stability compared to pristine Co3O4 QDs. The encapsulated graphene shell can obstruct thepulverization by inhibiting the volume expansion of Co3O4 QDs, which was supported by the fact that themorphology and structure of GE-Co3O4 QDs was not significantly changed after 100 cycles. We alsoconfirmed through scanning Kelvin probe microscopy, transmittance electron microscopy, and energydispersiveX-ray spectrometer that the morphology of GE-Co3O4 QDs was maintained whereas that ofCo3O4 QDs was almost fully decomposed. The encapsulation of graphene can play important roles such assuppression of volume expansion and producing a sufficient opposing force to aggregation during thecycles, resulting in a long stable life cycle.

소셜 미디어 데이터 마이닝을 활용한 스마트 스피커 제품에 대한 기회 분석

박영재,김명섭 한국산업경영시스템학회 2019 한국산업경영시스템학회 학술대회 Vol.2019 No.춘계