• Title/Summary/Keyword: scale effect

Search Result 8,452, Processing Time 0.031 seconds

Shaking Table Test of a Full Scale 3 Story Steel Frame with Friction Dampers (마찰형 감쇠장치가 설치된 실물크기 3층 철골프레임의 진동대 실험)

  • Bae, Chun-Hee;Kim, Yeon-Whan;Lee, Sang-Hyun;Park, Young-Pil
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.17 no.9
    • /
    • pp.862-873
    • /
    • 2007
  • Energy dissipation devices can be considered as an alternative for the seismic performance enhancement of existing structures based on the strengthened seismic design code. In this study, seismic response mitigation effects of friction dampers are investigated through the shaking table test of a full scale 3 story building structure. Frist, the bilinear force-displacement relationship of a structure-brace-friction damper system and the effect of brace-friction damper on the increase of frequency and damping ratio are identified. Second, frequency, displacement, and torque dependent characteristics of the friction damper are investigated by using harmonic load excitation tests. Finally, the shaking table tests are performed for a full scale 3 story steel frame. System identification results using random signal excitation indicated that brace-friction damper increased structural damping ratio and frequency, and El Centro earthquake test showed that brace-friction damper reduced the peak displacement and acceleration significantly. In particular, it was observed that the damping effect due to friction damper becomed obvious when the structure was excited by more intensive load causing frequent slippage of the friction dampers.

Design and Development of Micro Combustor (I) - Combustion Characteristics in Scale-Downed Combustor - (미세 연소기 개발(I) - 소형 연소기 환경에서의 연소 특성 -)

  • Lee, Dae-Hun;Choe, Gwon-Hyeong;Gwon, Se-Jin
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.26 no.1
    • /
    • pp.74-81
    • /
    • 2002
  • Combustion phenomena in a sub-millimeter scale combustor have been investigated. To evaluate scale effect on flame propagation characteristics, a cylindrical combustion chamber with variable depth was built in-house. The combustor was charged with premixed gas of hydrogen and air and ignited electronically. A piezo electric pressure transducer recorded transient pressure after the ignition. Measurements were made at different test conditions specified with chamber depth and initial pressure as parameters. Visual observation was made through a quartz glass window on top side of the combustion chamber using high speed digital video camera. From the pressure data, available work was estimated and compared with energy input required for stable ignition. The preliminary results suggested that the net thermal energy release is sufficient to generate power and enables a combustor of the size in the present study to be used as the energy source of a micro power devices .

The Intra System Dynamics and Family Financial Well-being -Focusing on family type- (가족체계 역동성과 가계재정복지 -가족유형을 중심으로-)

  • 고보선
    • Journal of the Korean Home Economics Association
    • /
    • v.37 no.3
    • /
    • pp.63-84
    • /
    • 1999
  • The purpose of this study was to explore how family type based on intra system dynamics explained housewives'objective and subjective family financial well-being. The data were collected by means of questionnaire distributed to a stratified sample of 662 housewives in Seoul who usually managers household finances. The questionnaire included family cohesion and adaptability scale, communication scale, financial management scale, and subjective family financial well-being scale. Frequency, percentile, mean, Х$^2$ Pearson’s correlation, one-way ANOVA, multiple regression were used to analyze the data. The study had resulted in five major findings: 1. Among four intra system dynamics elements were highly relationships 2. Families were categorized tv four types, named personal-oriented(N: 164), managerial-oriented(N=169), dynamics(N=154), and non-dynamic(N=134) family. 3. The four types of family were influenced tv age of housewives, duration of marriage, and job status of husbands. 4. The four types of family were significantly related with subjective family financial well-being. The personal-oriented family type was significantly related with objective family financial well-being. 5. The dynamic family type showed the highest effect of subjective family financial well-being. The personal-oriented family type showed the greatest effect of objective family financial well-being. The recommendation for future research and better ways to enhance level of intra system dynamics elements and family financial well-being.

  • PDF

The Effect of Neck Strengthening Exercise Using Proprioceptive Neuromuscular Facilitation on Swallow ability of Patient with Dysphagia: A Single Case Study (고유수용성신경근촉진법을 이용한 목근육 강화운동이 삼킴 장애환자에게 미치는 영향: 단일사례연구)

  • Lee, Soon-Hyun;Won, Young-Sick
    • PNF and Movement
    • /
    • v.13 no.3
    • /
    • pp.163-168
    • /
    • 2015
  • Purpose: The current study seeks to identify the effect of neck muscle strengthening exercise using proprioceptive neuromuscular facilitation (PNF) on the swallowing ability of patients diagnosed with dysphagia due to stroke. Methods: As a single case study, the current research conducted neck muscle strengthening exercise using PNF on the patient with dysphagia for 40 minutes, four times per week for a six-week period. At the same time, typical rehabilitation therapy for dysphagia was provided. This type of therapy included food-swallowing and the relation of the muscles surrounding the neck. The functional dysphagia scale and the penetration-aspiration scale were used to assess swallowing ability. Results: After the therapy, the functional dysphagia scale and the penetration-aspiration scale decreased by 18 points and 3 points, respectively, which proves the effectiveness of this type of therapy for dysphagia. Conclusion: The results of the current study indicate that neck muscle strengthening exercise using PNF reduces penetration-aspiration in patients with dysphagia, and that PNF can be clinically utilized to improve the swallowing ability of dysphagic patients.

A Case Report of a Patient with Lateropulsion in Lateral Medullary Infarction Improved by Korean Medicine Treatment Including Scalp Acupuncture (가쪽쏠림보행을 동반한 외측 연수경색 환자의 두침요법을 병행한 한의치료: 증례보고)

  • Hyun, Jae-Cheol;Jeong, Su-Hyeon
    • Journal of Korean Medicine Rehabilitation
    • /
    • v.31 no.4
    • /
    • pp.193-201
    • /
    • 2021
  • The aim of this study was to report the effect of Korean medicine treatment with scalp acupuncture of patient with lateropulsion, dizziness, headache caused by lateral medullary infarction. We treated the patient with scalp acupuncture, acupuncture, herbal medicine. Numeric rating scale (NRS), Korean version of berg balance scale (K-BBS), gait balance evaluation, dizziness handicap inventory (DHI), activities-specific balance confidence scale (ABC) and vestibular disorders activities of daily living scale (VADL) were used to evaluate symptoms. NRS of Lateropulsion, dizziness, headache were decreased. K-BBS score increased from 4 to 56, and in the gait balance evaluation, it returned to normal. DHI, VADL score were decreased and ABC score increased from 0 to 1,300. This case report shows that Korean medicine treatment with scalp acupuncture can be effective in lateral medullary infarction. However, further controlled studies are needed to confirm the effect of scalp acupuncture on such patients.

Assessing agricultural competitiveness of cities and counties in Gyeongbuk

  • Jeong, Jaewon;Kim, Hyun Seok
    • Korean Journal of Agricultural Science
    • /
    • v.45 no.4
    • /
    • pp.871-878
    • /
    • 2018
  • The government of Gyeongbuk in Korea increased the financial input in the agricultural sector by 43% from 2008 through 2012. However, the productivity of the agricultural sector in Gyeongbuk rose only about 3.6% during the same period. This study evaluated the agricultural competitiveness of each city or county in Gyeongbuk using six evaluation indices (scale, productivity, finance input, location quotient, technical education, and total) and investigated the relationship between the indices and total values of agricultural productions. The results show that Sangju, Gyeongju, Andong, Uiseong, and Seongju have high competitiveness for the scale index. For the productivity index, Gimcheon, Mungyeong, Ulleung, Yeongju, and Seongju were highly evaluated. For the location quotient index, Yeongcheon, Uiseong, Cheongdo, Seongju, and Sangju have high competitiveness. Uiseong, Yeongdeok, Cheongsong, Gunwi, and Yeongyang were highly evaluated for the agricultural finance input index. For the agricultural technical education index, Chilgok, Sangju, Mungyeong, Uiseong, and Gyeongju have high competitiveness. Finally, Sangju, Euiseong, Yeongcheon, Gyeongju, and Andong were highly evaluated for the total competitive index, while Yeongdeok, Yeongyang, Goryeong, Uljin, and Cheongsong have a low competitiveness for the total competitive index. This study also found that out of five indices, scale, location quotient, and technical education indices have a positive and statistically significant effect on the total values of agricultural production. However, we did not find any statistically significant effect of the productivity and finance input indices on the total values of agricultural production. Hence, we can conclude that the government should focus their agricultural policy on scale, location quotient and education to improve total agricultural production.

A Clinical case of a Hepatocellular carcinoma Patient with abdomen pain Improved by Daegunjoong-tang and Moxibustion. (대건중탕 및 쑥뜸치료로 호전된 간세포암 환자의 암성 통증 1례)

  • Lee, Su-jung;Ha, Jeong-been;Lew, Jae-hwan
    • Journal of Korean Traditional Oncology
    • /
    • v.25 no.2
    • /
    • pp.13-21
    • /
    • 2020
  • Objective: Most cancer patients suffer from various forms of pain. This study presents the case of a patient with hapatocellular carcinoma with abdominal pain treated by Daegunjoong-tang. Method: For 7 days, the patient was treated with Daegunjoong-Tang and Moxibustion. We planned to maintain moxibustion CV12(中脘), CV4(關元) for 20 minutes everyday. To evaluate the therapeutic effect, we used Visual Analogue Scale (VAS) and Clinical Opiate Withdrawal Scale (COWS). Results: After the treatments, Visual Analogue Scale (VAS) and Clinical Opiate Withdrawal Scale (COWS) score about abdominal pain are decreased. Conclusions: These results suggested that Daegunjoong-tang and Moxibustion have a beneficial effect on relieving abdominal pain caused by cancer.

Effect of inlet throttling on thermohydraulic instability in a large scale water-based RCCS: An experimental study

  • Qiuping Lv;Matthew Jasica;Darius Lisowski;Zhiee Jhia Ooi;Rui Hu;Mitch Farmer
    • Nuclear Engineering and Technology
    • /
    • v.56 no.2
    • /
    • pp.655-665
    • /
    • 2024
  • The objective of the present experimental study is to investigate the effect of inlet throttling on the thermohydraulic stability of a large scale water-based Reactor Cavity Cooling System (RCCS). The test was performed using the water-based Natural convection Shutdown heat removal Test Facility (NSTF) at Argonne, which represented a ½ axial scale and 12.5° sector slice of the full scale Framatome 625 MWt SC-HTGR RCCS concept. A two-phase steady state was first established through direct condensate refill, followed by increased inlet throttling over 10 stages, corresponding to a loss coefficient K over the range of 0.05-653. With the inlet throttling gradually increased, the system experienced a unique transition process between stabilization and destabilization. Through a stability analysis, three instability mechanisms were identified in the present test, including a compound mechanism due to both natural circulation oscillations (NCOs) and density wave oscillations (DWOs), Type-II DWOs, and geysering.

The Effect of Listening to Music for the Reduction of Unilateral Neglect in Chronic Stroke: A Single Subject Study (음악 감상이 만성기 뇌졸중 환자의 편측무시에 미치는 영향 : 단일대상 연구)

  • Lee, Eun-Young
    • Therapeutic Science for Rehabilitation
    • /
    • v.2 no.2
    • /
    • pp.67-75
    • /
    • 2013
  • Objective : This study aims to investigate the effect of listening to music for the reduction of unilateral neglect in stroke patients. Methods : This study used a single subject (A-B) design for a stroke patient with unilateral neglect. The subject was trained for 12 sessions in total. Unilateral neglect was measured using a line bisection test and catherine bergego scale. Results : The line bisection test showed decreased mean error scores of treatment period(B) compared with baseline period(A). and catherine bergego scale showed slightly decreased total scores of treatment period(B) compared with baseline period(A). Conclusion : The listening to music showed a beneficial effect for the reduction of unilateral neglect.

A Study on the relationship between Transformational Leadership and Job Involvement according to Nurses' Personal Characteristics (임상간호사의 성격특성에 따른 변혁적 리더쉽과 직무몰입과의 관계)

  • Kim Myoung Sook;Park Young Bae
    • Journal of Korean Public Health Nursing
    • /
    • v.15 no.2
    • /
    • pp.249-261
    • /
    • 2001
  • Today's health care environment is rapidly changing and nurse administrators' leadership styles need to identify in nursing organization to achieve organizational objectives. By Bass(1985), transformational leadership stimulates the subordinates to be creative and achieve organizational objectives and is related to job satisfaction, job involvement, productivity, and organizational commitment. Transformational leadership process consists of charisma, intellectual stimulation, individual consideration. The purpose of this study was to identify the effect of transformational leadership and personal characteries on nurses' job involvement. The subjects for this study consisted of 594 nurses from 8 University Hospitals and General Hospitals. The data were collected by personal characteristics scale, transformational leadership scale, and job involvement scale. The factor analysis, Cronbach's alpha analysis, Pearson correlation analysis, multiple regression analysis and hierarchical multiple regression analysis were used for the statistical method. The results of this study were found that (1) charisma dimension of transformational leadership has positive influence on nurses' job involvement ; but another two dimensions (intellectual stimulation and individualized consideration) did not showed significant effect on job involvement (2) nurses' personal characteristic (internal locus of control) moderated the effect of transformational leadership on job involvement.

  • PDF