운동학습에 의한 왼쪽 하전두영역의 분할비등방성의 변화

박지원,남기석,Park, Ji-Won,Nam, Ki-Seok 대한물리치료학회 2010 대한물리치료학회지 Vol.22 No.5

Purpose: This study was to delineate the structural change of neural pathway after sequential motor learning using diffusion tensor imaging (DTI). Methods: The participants were 16 healthy subjects, which were divided by training (n=8) and control (n=8) group. The task for the training was the Serial Reaction Time Task (SRTT) which was designed by Superlab program. When the 'asterisk' shows up in the 4 partition spaces on the monitor, the subject presses the correct response button as soon as possible. The training group participated in the training program of motor learning with SRTT composed of 24 digits pattern in one hour per daily through 10 days during 2 weeks. Results: In the behavioral results the training group showed significant changes in the increase of response number and the reduction of response time than those of the control group. There was significant difference in the left inferior frontal area in the fractional anisotropy (FA) map of the training group in DTI analysis. Conclusion: Motor sequential learning as like SRTT may be needed to the learning of language and visuospatial processing and may be induced for the experience-dependent structural plasticity during short period.

해양플랜트용 500 MPa급 후판강의 모재 및 HAZ의 미세조직과 기계적 특성의 상관관계

박지원,조성규,조영욱,신건철,권용재,이정구,신상용,Park, Jiwon,Cho, Sung Kyu,Cho, Young Wook,Shin, Gunchul,Kwon, Yongjai,Lee, Jung Gu,Shin, Sang Yong 한국재료학회 2020 한국재료학회지 Vol.30 No.3

In this study, two types of thick steel plates are prepared by controlling carbon equivalent and nickel content, and their microstructures are analyzed. Tensile tests, Vickers hardness tests, and Charpy impact tests are conducted to investigate the correlation between microstructure and mechanical properties of the steels. The H steel, which has high carbon equivalent and nickel content, has lower volume fraction of granular bainite (GB) and smaller GB packet size than those of L steel, which has low carbon equivalent and nickel content. However, the volume fraction of secondary phases is higher in the H steel than in the L steel. As a result, the strength of the L steel is higher than that of the H steel, while the Charpy absorbed energy at -40 ℃ is higher than that of the L steel. The heat affected zone (HAZ) simulated H-H specimen has higher volume fraction of acicular ferrite (AF) and lower volume fraction of GB than the HAZ simulated L-H specimen. In addition, the grain size of AF and the packet sizes of GB and BF are smaller in the H-H specimen than in the L-H specimen. For this reason, the Charpy absorbed energy at -20 ℃ is higher for the H-H specimen than for the L-H specimen.

자살시도자들에서 충동성과 자살시도의 의학적 치명도와의 관계

박지원,서경훈,손경훈,한재현,전영주,정유진,이원준,성수정,한창환,조규종,황재연,Park, Ji Won,Suh, Kyung Hoon,Son, Kyung Hoon,Han, Jae Hyun,Jeon, Yeong Ju,Jung, Yu Jin,Lee, Won Joon,Seong, Su Jeong,Han, Chang Hwan,Cho, Gyu Chong,Hwang, J 대한생물정신의학회 2018 생물정신의학 Vol.25 No.4

Objectives Although impulsivity has long been thought as an important factor influencing suicidal behaviors, it is unknown whether impulsivity increases the risk of dying from suicidal behaviors and what specific component among constructs of impulsivity contributes to the risk of dying among suicide attempters. Methods To elucidate the association between impulsivity and medical lethality of suicide attempt among suicide attempters, we consecutively recruited 46 suicide attempters who visited an emergency room of a general hospital located in a metropolitan area, Seoul, Republic of Korea, due to suicide attempts and consented to participate in this study. Then we assessed medical lethality with the Beck Lethality Scale (LS) and impulsivity with the Korean version of the Barratt Impulsiveness Scale-11-Revised (BIS). Demographic variables were obtained from medical records and structured social work reports for suicide attempters. Results Although total scores of the BIS did not correlate with LS scores, only the scores of self-control, that is one of the Barrett's six theoretical constructs of impulsivity in which the higher score indicates less self-control and more impulsivity, had a significant positive correlation with scores of LS (p = 0.003). The association remained significant after adjusting for variables known to affect suicide lethality such as job status, recent alcohol consumption, diagnosis of depressive disorders, and having a plan for suicide (${\beta}=0.429$, p = 0.009). Conclusions Not impulsivity in general, but poor self-control, in particular, predicts lethal suicidal behaviors among suicide attempters. The degree of self-control should be evaluated when assessing patients with elevated suicide risk, and proper measures should be installed to prevent possible future lethal suicide attempts.

쌀가루전용 품종들의 이화학적 특성 및 설기의 품질 특성

박지원,최선영,천아름,정헌상,이연리,Park, Ji Won,Choi, Sun Young,Chun, Areum,Jeong, Heon Sang,Lee, Youn Ri 한국식품영양학회 2019 韓國食品營養學會誌 Vol.32 No.4

This study attempts to analyze the physicochemical characteristics of rice flour developed as rice powder for exclusive use, steamed rice cake recipes developed as basic recipefor rice cakes. The study also aims to compare the quality characteristics of steamed rice cakes in an effort to establish the possibilities of developing various rice cake recipes. The moisture content and amylose content increased as the rice powder particles for exclusive use became finer. With regards to water uptake, in the case of the Hungara type, the water uptake increased as rice powder particles increased in size. In the case of the Shingil and commercial types, the water uptake decreased as rice powder particles increased in size, and solubility and swelling force decreased as rice powder particles increased in size. In the case of chromaticity, Sulgidduk made with rice powder for exclusive use the brightness (L value) increased as powder particles became finer and the yellow indexes (b value) decreased, and this was especially pronounced in the Shingil type. The measurements of changes in the mechanical textures of Sulgidduk showed that rice types with larger particles led to lower hardness, cohesiveness, springiness, and chewiness.

광학R&D산실 - 초정밀가공 방산기술 국산화로 도약의 기지개 '활짝', 한국전광(주) 부설연구소

박지원,Park, Ji-Won 한국광학기기산업협회 2010 光學世界 Vol.126 No.-

한국전광(주)(대표.채진석, www.keocvi.com)는 코팅전문업체로서 국내보다는 미국, 일본, 독일 등 세계에 먼저 이름을 알리며 고출력레이저광학소자의 가공 및 코팅에서만큼은 이미 세계 최고 대열에 들어섰다고 자부한다. 최근에는 방산, 항공우주, 반도체, 의료기기 등 전방위에 들어가는 고부가가치 광학소자 및 시스템 분야로 사업 영역을 확장시키며 광학부품업체에서 토털솔루션 제작업체로 변신을 추구하고 있는 가운데 부설연구소의 김기호 연구소장을 만나 최근의 연구개발 현황을 들어보았다.

계단 보행 시 불안정성 신발 착용에 따른 슬관절 부하에 대한 연구

박지원,김윤진,Park, Ji-Won,Kim, Yun-Jin 대한물리치료학회 2014 대한물리치료학회지 Vol.26 No.2

Purpose: The purpose of this study is to compare kinematics and kinetics on the knee joint between stair gait with unstable shoes and barefoot in healthy adult women. Methods: Seventeen healthy adult women were recruited for this study. The subjects performed stair ascent and descent with unstable shoes and barefoot. The experiment was repeated three times for each stair gait with unstable shoes and barefoot. Measurement and analysis of the movements of the knee joint were performed using a three-dimensional analysis system. Results: Statistically significant differences in the knee muscle force of semimembranosus, biceps femoris-long head, biceps femoris-short head and sartorius, patellar ligament, medial gastrocnemius, and lateral gastrocnemius were observed between unstable shoes and barefoot gait during stair ascent. Statistically significant differences in the knee muscle force of sartorius, rectus femoris, medial gastrocnemius, and lateral gastrocnemius were observed between unstable shoes and barefoot gait during stair descent. Statistically significant differences in the knee flexor moment of semitendinosus, biceps femoris-long head, biceps femoris-short head, sartorius, rectus femoris, vastus intermedialis, medial gastrocnemius, and lateral gastrocnemius were observed between unstable shoes and barefoot gait during stair ascent. Conclusion: Therefore, wearing unstable shoes during stair gait in daily life is considered to influence knee joint kinematics and kinetics due to the unstable shoes, and thus suggest the possibility that reducing the risks of pain, and knee osteoarthritis, stabilizing the knee joint caused by changes in the loading of the knee joint.

볶음땅콩가루, 새싹 땅콩가루를 첨가한 쌀파이의 품질 특성

박지원,김민영,김미옥,이혜림,이진주,김수경,정헌상,이연리,Park, Ji Won,Kim, Min Young,Kim, Mi Ok,Lee, Hye Rim,Lee, Jin Ju,Kim, Su Kyung,Jeong, Heon Sang,Lee, Youn Ri 한국식품영양학회 2018 韓國食品營養學會誌 Vol.31 No.5

The purpose of this study is to make rice pie, a bakery item, to enhance use of rice flour and analyze quality characteristics of rice pie by adding roasted peanut flour and peanut sprout flour. Water content of rice pie adding roasted peanut flour or peanut sprout flour is lower than that of wheat pie. The pH of rice pie is lower than that of wheat pie, and pH becomes higher when roasted peanut flour or peanut sprout flour is added. Density of dough is lower in rice pie than in wheat pie, and when roasted peanut flour or peanut sprout flour is added, rice pie reveals higher density. Loss rate is higher in rice pie than in wheat pie, and when roasted peanut flour or peanut sprout flour is added, rice pie reveals lower loss rate. When roasted peanut flour or peanut sprout flour is added to rice pie, its brightness (L) and yellowness (b) decrease, while redness (a) increases. Hardness is higher in pie made of rice powder than in wheat pie, and when roasted peanut flour or peanut sprout flour is added, hardness becomes lower. Regarding composition of fatty acids in rice pie, saturated fatty acids observed are myristic acids, palmitic acids, and stearic acids. Monounsaturated fatty acids found are mainly oleic acids. Polyunsaturated fatty acids detected are linoleic acids, and are found more in pie made of rice powder, than in wheat pie.

국소 교뇌 경색으로 인한 뇌졸중 환자에서 장기적인 운동기능 회복에 관한 사례보고

박지원,Park, Ji-Won 대한물리치료학회 2009 대한물리치료학회지 Vol.21 No.4

Purpose: The aim of this study was to present fundamental information regarding clinical prognosis and clinical criteria for therapeutic intervention in stroke patients with focal pons infarction. Methods: Four stroke patients (male: 2, female: 2) who were diagnosed with pons infarction were recruited. All subjects had motor functions evaluated using methods such as the Motricity Index (MI), the Modified Brunnstrom Classification (MBC), Functional Ambulatory Category (FAC), and the Bathel Index (BI). Evaluations were done at least 4 times over a period that was approximately 8~11 months from stroke onset. We compared the final evaluation with the first evaluation. Results: All patients with focal pons infarction showed improvement with time in motor function. The physical strength of all patients was improved to normal or good grades from zero or trace grades in the Motricity Index test. Also, other motor functions such as ambulatory capacity and activities of daily living (ADL) improved with time. Conclusion: Aspects of functional recovery and clinical prognosis are clearly predictable for specific patients with focal pons infarction. In addition, adequate therapeutic interventions can be provided clinical criterion to patients, according to aspect of functional recovery. Accordingly, patients with pons infarction change for the better over time.

태양광 시스템의 인공신경망 기반 I-V 특성 모델링 향상

박지원,이종환,Park, Jiwon,Lee, Jonghwan 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.3

The current-voltage modeling plays an important role in characterizing photovoltaic systems. A solar cell has a nonlinear characteristic with various parameters influenced by the external environments such as the irradiance and the temperature. In order to accurately predict current-voltage characteristics at low irradiance, the artificial neural networks are applied to effectively quantify nonlinear behaviors. In this paper, a multi-layer perceptron scheme that can make accurate predictions is employed to learn complex formulas for large amounts of continuous data. The simulated results of artificial neural networks model show the accuracy improvement by using MATLAB/Simulink.

촉각 자극과 두점식별 자극에 따른 뇌활성도 분석: fMRI 사례 연구

박지원,김중선,Park, Ji-Won,Kim, Chung-Sun 대한물리치료학회 2010 대한물리치료학회지 Vol.22 No.4

Purpose: Sensory input is very important for proper performance of human. Two-point discrimination is the most widely used tactile sensory test. The purpose of this study was to find the changes in cortical activation patterns between tactile stimulation and two-point discrimination. Methods: Two healthy subjects participated in our study. fMRI scanning was done during 4 repeated blocks of tactile stimulation and two point discrimination of the right index finger tip. In one block, stimuli were repeated 10 times every three seconds. To determine the changes of cortical neurons during sensory input, intensity index was analyzed. Results: When tactile stimulation of the right index finger tip was completed, only contralateral primary somatosensory area was activated. In contrast, during two-point discrimination, both the primary somatosensory area and ipsilateral supplementary sensory area were activated. Conclusion: During two point discrimination, both primary somatosensory area and ipsilateral supplementary sensory area were activated. Therefore, two-point discrimination is required more complex and conscious activity than tactile stimulation.