국내 치매 노인을 위한 인지중재활동의 효과: 메타분석

권재성 ( Jae Sung Kwon ) 한국보건정보통계학회 2019 보건정보통계학회지 Vol.44 No.3

Objectives: The purpose of this meta-analysis was to investigate the effects of cognitive intervention activities (CIAs) for the elderly with dementia in Korea. We had searched for articles related to cognitive intervention for dementia over the past decade. Methods: The studies were searched through domestic search engine such as Earticle, KISS, Kyoboscholar, NDSL and RISS. The PEDro scale was used to assess the quality of the studies. The meta-analysis was implemented to analyze statistical values such as the number of samples, mean and standard deviation. Results: Nine papers were carefully selected for meta-analysis. The PEDro scales of analyzed studies were 4-5 points. The total number of subjects in identified studies was 336. We classified the dependent variables into mental function (MF) and activity and participation (A&P) based on the International Classification of Functioning, Disability and Health to compute effect sizes. The effect size of MF was 0.464 and the effect size of A&P was 0.422, both of which were “medium effect sizes”. Conclusions: The medium effect sizes for CIAs are clinically acceptable. However, it should be considered that dementia is a degenerative disease. And well designed and high quality research should be implemented continuously.

기능적 인지의 작업치료 임상 적용 필요성

권재성 ( Kwon Jae Sung ) 대한인지재활학회 2021 대한인지재활학회지 Vol.10 No.1

The aim of this study was to introduce the concept of functional cognition to the clinical field of occupational therapy and to explain the process up to the appearance of functional cognition based on the historical context of occupational therapy and the process of changing cognitive concepts. In addition, it was attempted to examine the perspectives of occupational therapy clinical models for functional cognition and to explain the necessity of clinical application of functional cognition in occupational therapy. Functional cognition is historically based on holistic and occupation-based integrationism and conceptually influenced by situated cognition. Functional cognition is not a new theory, but a combination of occupational therapy theory and knowledge accumulated by professional experience. The concept of functional cognition includes various clinical models and frame of references of cognitive rehabilitation in occupational therapy. Functional cognition is the most occupational therapy-like concept of cognition in that it describes integrative cognition from the perspective of human occupation. Occupational therapists can evaluate real tasks in daily life through functional cognitive concepts and implement client-centered intervention in cognitive rehabilitation. Functional cognition is still constantly evolving. Therefore, functional cognition should be continuously studied and developed by occupational therapists who are experts in cognitive rehabilitation.

高所에서 墜落時에 發生한 骨骼系統損傷에 對한 臨床的考察

權宰成(Jae Sung Kwon),韓時俊(See Joon Hahn) 대한정형외과학회 1969 대한정형외과학회지 Vol.4 No.2

지역냉방을 위한 아이스슬러리의 연속제조 및 배관내 빙충전율 조절

권재성(Jae-Sung Kwon),이윤표(Yoon Pyo Lee),이상훈(Sang Hoon Lee),유호선(Hoseon Yoo),윤석만(Seok-Mann Yoon) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.12

The ice slurry maker which can produce the ice slurry well for the ice particle in-flowing condition was revised. We removed the stagnant region at the top of the ice slurry maker, and IPF 40% could be realized. The IPF controller with 6㎜ diameter holes at the bottom was designed. But the IPF controller with only 6㎜ diameter holes could not control IPF in a pipe. This is because the ice particles at ice slurry flow exist homogeneously not only at the upper part but also at the bottom part. We changed the hole size of IPF controller surface using fine meshes and then, IPF in a pipe was increased by 70% when the hole size was 80㎛ and less.

포스트가 배열된 마이크로 채널 내 전기 역학 및 유전 영동 흐름에 대한 수치 연구

권재성(Jae-sung Kwon),맹주성(Joo-sung Maeng),송시몬(Simon Song) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11

본 논문은 마이크로 채널 내의 전기 역학 및 유전 영동 현상을 수치적으로 분석하였다. 이를 위하여 원형 post가 배열된 마이크로 채널 내에 직류 전기장을 걸어주고 두 현상을 수치적으로 해석하였다. 외부 전기장에 의해 마이크로 채널내에 전기 역학 및 유전 영동 현상이 발생할 때 전기장의 세기에 따라 세 가지 형태의 입자 움직임이 나타난다. 낮은 전기장 세기에서는 전기 역학이, 높은 전기장 세기에서는 유전 영동이 지배적으로 입자의 움직임에 영향을 준다. 그 중간세기의 전기장에서는 streaming 유전영동 현상이 관찰된다. 이 연구는 현재 진행중인 연구로서 앞으로는 전기장에 대한 post 배열 각도와 post 형상을 달리하여 전기 역학과 유전 영동 현상의 변화를 연구하고, 이를 바탕으로 칩위에서 바이오샘플을 분리, 정제, 추출할 수 있는 샘플 전처리기술을 개발하고자 한다. 또한 칩 설계에 최적화 기술을 도입하여 바이오칩 성능을 획기적으로 향상시킬 것이다. We predict electrokinetic and dielectrophoretic flows in microchannels with a uniform post array. Computational studies are performed to determine velocity of particles suspending in a fluid driven by electrokinesis and dielectrophoresis in the channel. Monte-Carlo simulations are also conducted to visualize the particle motions. At low applied electric fields, electrokinesis is the dominant transport mechanism. At moderate applied fields, dielectrophoresis are in balance with electrokinesis and diffusion to produce flowing filaments of concentrated and rarefied particles in the microchannels. At high applied fields, dielectrophoresis overwhelms, and locally traps particles. The results provide useful insight for optimizing design parameters of a microfluidic chip to carry out on-chip sample pretreatment using electrokinetic and dielectrophoretic effects.

마이크로 채널내의 전기 역학 및 유전 영동 현상에 대한 수치 해석

권재성(Jae-sung Kwon),맹주성(Joo-sung Maeng),송시몬(Simon Song) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5

Electrokinesis and dielectrophoresis are two technologically important transport phenomena produced by an external electric field applied to a conductive fluid. Electrokinesis including electroosmosis and electrophoresis is transports of particle or fluid with net mobile charges and is caused by the external electric field. In contrast, dielectrophoresis is particle motions caused by an electric field gradient on an induced dipole moment of the particle and the surrounding fluid. Numerical analyses are conducted to predict the particle and fluid motions under an external electric fields in microchannels made of glass. Results provide insights into electrokinetic and dielectrophoretic behaviors of the particles and fluids and enable to optimize microchannel designs of biochips for biochemical analysis.

작업치료 이론에 기반한 기능적 인지 개념 분석

권재성 ( Kwon Jae Sung ) 대한인지재활학회 2023 대한인지재활학회지 Vol.12 No.1

The aim of this study was to analyze the concept of functional cognition based on various clinical models (CMs) and the frame of reference (FOR) of occupational therapy through a literature review, and to present it as an evidence-based practice (EBP) for cognitive rehabilitation. For analysis, the concept of functional cognition was categorized into 5 domains, and the concept of each classified domain was compared with the concept of CMs and FORs of occupational therapy, which are closely related to cognitive rehabilitation. The CMs and FORs selected for analysis were the model of human occupation, the cognitive disabilities model, the dynamic interactional model, the cognitive orientation to daily occupational performance model, the neurofunctional approach, the rehabilitative/compensatory model, and multicontext approach. This literature review has clinical significance in that it reveals that the concept of functional cognition has a scientific evidence based on occupational therapy theory and emphasizes that it can be used as an EBP for cognitive rehabilitation. If occupational therapists actively apply the concept of functional cognition to clinical practice, they will be able to strengthen their expertise in cognitive rehabilitation and realize cognitive rehabilitation worthy of the occupational therapy.

미세유동 칩에 배열된 원형 포스트가 전기 역학 및 유전 영동 유동에 미치는 영향

권재성(Jae-Sung Kwon),맹주성(Joo-Sung Maeng),김태호(Tae-Ho Kim),송호성(Ho-Sung Song),송시몬(Simon Song) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

Microfluidic chips are frequently used for the automation and miniaturization of the analytic processes of bio molecules such as DNA or proteins. Among physical phenomena occurred on a microfluidic chip, electrokinesis and dielectrophoresis are paid attention to as means to transport and control the bio molecules. To effectively utilize electrokinesis and dielectrophoresis, it is important to design the shape of a microchannel on a microfluidic chip. We investigate the effects of microchannel geometry with circular posts on electrokinesis and dielectrophoresis, and determine a microchannel geometry suitable for the clean-up or separation of bio molecules. In addition, we examine forces on particles exerted by electrokinesis and dielectrophoresis for various post diameters and spacings using an in-house CFD code. As a result, an optimal shape of a microchannel is suggested that is suitable for separating bio molecules with different surface charges.

광-전기역학적 입자제어 기술, 그리고 그 기술의 바이오 테크놀로지 분야 내 응용

권재성(Jae-Sung Kwon) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.4

골단판 수에 따른 뼈 나이 측정 결과의 정확성 분석

권재성(Jae-Sung Kwon),김형준(Hyoung-Joon Kim),이종민(Jong-Min Lee),김회율(Whoi-Yul Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7

Bone age assessment has been widely used to measure the ossification in pediatric radiology. For the assessment, first bone age of each epiphyseal plate is estimated using DCT/LDA, then the bone age of a patient is calculated by using the median of 9 estimations. For some patients, however, due to various reasons such as X-ray image quality or the pose of fingers, it is common to miss couple of plates in automated systems. In this paper, we investigate the relationship between the number of detected plates and the accuracy of bone age assessment. In the experimental results, we confirmed the similarity between bone age assessed using more than 7 epiphyseal plates and that assessed using 9 epiphyseal plates.