• Proceedings of the Safety Management and Science Conference
• /
• 2006.04a
• /
• pp.195-200
• /
• 2006

건설업계는 제조업과 특성이 달라 여러 가지 문제점이 엿보인다. 특히, 건설업 근골격계 질환에 대한 연구 및 지원은 별로 찾아볼 수가 없다. 근골격계 질환의 제조업과 건설업의 비율을 보았을 때 "2004 산업재해분석" 요양자 업종별 분포를 보면 제조업이 3,281명(79.79%)로 건설업의 63명(1.53%)보다 월등히 많은 것으로 조사되었다. 이는 미국의 사례를 보았을 때, 2007년 업종별 분포를 보면 건설업이 42,867명(26.20%), 제조업이 101,437명(36.23%)로 우리나라에 비해 건설업 근골격계 질환자가 상대적으로 많은 것으로 조사되었다. 이는 건설업에서의 근골격계 부담 작업 실태조사 등을 통하면 제도적 문제점이나, 근로자가 몰라서 질병에 이환되는 경우가 아닌가 한다. 건설업 근로자들은 건설업 특성상 근골격계 질환예방을 위한 도구를 거의 사용하지 못하고, 작업의 연속성, 지속성이 떨어지므로 부자연스럽고, 불편한 자세를 작업을 위해 수시로 반복하여 취할 수 밖에 없다. 따라서 건설업체에 중대재해를 줄이기 위한 노력 뿐 만 아니라, 열악한 건설업체의 근로자의 근골격계 질환 예방에 대한 제도적인 지원과 안전담당자 교육, 근로자에 대한 근골격계 질환 예방교육(스트레칭, 작업 자세, 동작, 근력강화, 적절한 휴식시간 부여) 등 대책이 절실히 필요하고 하겠다.

• Korean Journal of Veterinary Research
• /
• v.15 no.2
• /
• pp.271-277
• /
• 1975

한국재내산양(韓國在來山羊) 11두(頭)의 흉벽근(胸壁筋)을 절개하여 관찰하였던 바 다음과 같은 결과(結果)를 얻었다. 1. 산양(山羊)의 흉벽(胸壁)에는 횡격막을 포함하여 11개의 筋들을 확인할 수 있었다 : 전배거근(前背鋸筋) M. serratusdorsalis cranialis, 후배거근(後背鋸筋) M. serratus dorsalis caudalis, 사각근(斜角筋) M. scalenus, 늑횡근(肋橫筋) M. transversus costarum, 늑골거근(肋骨擧筋) Mm. levatores costarum, 외늑간근(外肋間筋) Mm. intercostales externi, 내늑간근(內肋間筋) Mm. intercostales interni, 늑연골간근(肋軟骨間筋) Mm. intercartilaginei, 늑골후인근(肋骨後引筋) M. retractor costae, 흉횡근(胸橫筋) M. transversus thoracis, 횡격막(橫隔膜) Diaphragma. 2. 전배거근(前背鋸筋)의 발달이 아주 미약하여 단지 1예(例)에서만 볼 수 있었다. 3. 사각근(斜角筋)은 천부(淺部)(M. scalenus supracostalis)와 심부(深部)(M. scalenus primal costae)로 구분되었으며 이들은 각각 배(背), 복(腹)으로 나누어졌고, 천부(淺部)는 제 1늑골 및 제 3~4늑골에서 기시(起始)하고 있었다. 4. 늑연골간근(肋軟骨間筋)은 제 7늑간에서는 양쪽 늑골이 서로 밀접하게 붙어있어 나타나지 않았으며, 제 1늑간 부터 제 6늑간 사이에서는 섬유방향이 거의 수평으로 향하고 있어 내늑간근(內肋間筋)의 연장으로 보이고 제 8늑간 부터 마지막 늑간사이에서는 거의 수직으로 향하고 있어 외늑간근(外肋間筋)의 연장으로 보인다.

• Proceedings of the Korea Contents Association Conference
• /
• 2012.05a
• /
• pp.347-348
• /
• 2012

본 연구의 목적은 치과위생사의 근무환경, 근골격계 질환 예방교육에 대한 인식, 작업관련성 근골격계 질환과 근무특성과의 연관성에 대하여 알아보고자 하였으며, 근골격계 질환 증상 감소를 위한 관리방안을 제시하고자 한다. 전국(서울, 경기, 대구, 포항) 210명의 치과위생사를 대상으로2011년 8월 1일부터 12일까지 자기기입식 설문지 조사를 시행한 후 회수하여 응답이 불분명하거나 크게 사고를 당한 5명을 제외한 205명에 대해서 분석 하였다. 수집된 자료는 SPSS WIN 15.0 프로그램을 이용하여 분석하였다. 그 결과 근골격계질환 예방에 관한 교육을 받은 적이 없는 치위생사가 78.0%로 대부분을 차지하였으며, 근골격계 질환 예방프로그램이 필요하다고 인식하는 치과위생사가 93.2%로 대부분을 차지하였다. 신체부위별 통증빈도를 보면, 평균이 '어깨-목 사이(오른쪽)'가 3.07로 가장 높았고, 신체부위별 통증 정도를 보면, 평균이 '발목/종아리(왼쪽)'가 1.47로 가장 높게 나타났다. 신체부위별 근골격계 질환 통증경험 관련 작업능력 지장여부를 보면, 평균이 '무릎(오른쪽)'이 1.84로 가장 높게 나타났다. 손에 대한 근골격계 질환 증상으로는 오른손의 불편함 정도를 보면, 평균이 'Abductor hallucis muscle' 부분이 2.05로 가장 높았고, 왼손의 불편함 정도를 보면, 평균이 'Thumb' 부분이 1.69로 가장 높게 나타났다.

• The Journal of the Korea Contents Association
• /
• v.12 no.8
• /
• pp.256-263
• /
• 2012

The purpose of this study is to investigate how hotel employees' musculoskeletal pain, which is likely caused by their poor working environment, affects their intent on changing jobs. The participants of this study were 200 hotel employees who were experiencing musculoskeletal pain. They were asked four questions through face-to-face interviews and questionnaires. They were asked four questions through face-to-face interviews and questionnaires. These four questions were about musculoskeletal pain, the employees' working environment, their turnover intention, and their general personalities. This study finds that the musculoskeletal pain is related to the employee's turnover intention. Based on its findings, this study claims that an adequate working environment and various preventative programs are necessary to decrease the number of employees resigning and to prevent musculoskeletal pain.

• Journal of Life Science
• /
• v.12 no.6
• /
• pp.786-795
• /
• 2002

Three-day-old sunfower(Helianthus annuus L.) seedlings were do-rooted and incubated in the nutrient solutions that contained either deficient or sufficient boron supply, and exposure to various pH and temperatures. In the absence of boron, no adventitious roots were formed in the majority of the seedlings. Boron caused the development of numerous adventitious roots in the lower part of the hypocotyl. The low pH damage was ameliorated by the simultaneous application of calcium, implying the involvement of calcium-requiring process in overcoming proton toxicity. Borate showed a strong ameliorative effect with $Ca^{2+}$. These results suggest that the primary target of proton toxicity may be linked to a disturbance of the stability in the pectic polysaccharide network, where calcium plays a key role in plant roots. Maximum temperature for the growth of adventitious roots was $25^{\circ}C$. Although cessation of growth is the most apparent symptom of boron deficiency, exogenous ascorbate improved adventitious root growth in plants in the absence of boron. From the results it is suggested that the inhibition of adventitious root resulting from boron deficiency, low pH and temperature damage may be a consequence of disrupted ascorbate metabolism.

• Journal of the Korea Concrete Institute
• /
• v.21 no.1
• /
• pp.65-74
• /
• 2009

Glass fiber reinforced polymer (GFRP) bars are sometimes used when corrosion of conventional reinforcing steel bar is of concern. In this study, a total of 36 beams and one-way slabs reinforced using GFRP bars were tested in flexure. Four different GFRP bars of 13 mm diameter were used in the test program. In most test specimens, the GFRP bars were lap spliced at center. All beams and slabs were tested under 4-point loads so that the spliced region be subject to constant moment. Test variables were splice lengths, cover thicknesses, and bar spacings. No stirrups were used in the spliced region so that the tests result in conservative bond strengths. Average bond stresses that develop between GFRP bars and concrete were determined through nonlinear analysis of the cross-sections. An average bond stress prediction equation was derived utilizing two-variable linear regression. A splice length equation based on 5% fractile concept was then developed. As a result of this study, a rational equation with which design splice lengths of the GFRP bars can be determined, was proposed.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.11a
• /
• pp.859-862
• /
• 2008

The objective of this study offer the equation of the development length for GFRP reinforcement. Pullout test carried out to propose the development length for GFRP reinforcement. Test variables included embedment length (L=15, 30 and 45d$_b$ ), pure cover thickness(C=0.5, 1.0, 1.5, and 2.0d$_b$ ), diameter of reforcement(D10, D13 and D16), and three types, (domestic : K2KR, K3KR, foreign : AsUS) of GFRP reinforcement. The method of test were introduced pure pullout and tests lasted until the GFRP reinforcements were reached final failure. Based on the results through the pullout test, the bond characteristics and average bond stress for GFRP reinforcement were investigated. The equation of development length was proposed based on the regression analysis selected specimens having splitting failure. The equation gained from this study compared with the design equation provided by ACI committee 440.1R-06. The results through this study are capable of the flexural member design with GFRP reinforcement having lab spliced.

• Korean Journal of Plant Tissue Culture
• /
• v.25 no.6
• /
• pp.525-530
• /
• 1998

These studies were carried out to select the active grow hairy root lines induced from various ginseng(Panax ginseng C. A. Meyer) parts. Hairy roots were induced in root explants, stem and petiole in vitro by A. rhizogenes R1000 or A. rhizogenes $A_4$. These hairy roots could be grown on the phytohormone free medium, and PCR analysis of rol C and vir C gene fragments confirmed that hairy roots were transgenic tissues. We have selected 11 hairy root lines with active growing characters among 300 hairy root lines selected based on growth and morphological characteristics on 1/2MS solid media with 250 mg/L carbenicillin. Morphological characteristics of selected 11 hairy root lines were thickness and thiness of main roots, and many projection for lateral roots, active grow of lateral roots. Among selected 11 hair root lines prominent characteristics of hairy roots with active growing characters were thiness of main roots and active grow of lateral roots. But characteristics of low growing hairy roots were thickness of main roots and low grow of lateral roots. Finally we have selected actively growing hairy roots, KGHR-1, KGHR-5, KGHR-8 among 11 hairy root lines.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.1
• /
• pp.20-27
• /
• 2020

In general, a nonlinear system is linearized in the form of a multiplication of the 1st and 2nd order system. This paper reports a design method of a weighting matrix and control law of LQ control to move the double poles that have a Jordan block to a pair of complex conjugate poles. This method has the advantages of pole placement and the guarantee of stability, but this method cannot position the poles correctly, and the matrix is chosen using a trial and error method. Therefore, a relation function (𝜌, 𝜃) between the poles and the matrix was derived under the condition that the poles are the roots of the characteristic equation of the Hamiltonian system. In addition, the Pole's Moving-range was obtained under the condition that the state weighting matrix becomes a positive semi-definite matrix. This paper presents examples of how the matrix and control law is calculated.

• The Journal of the Korea Contents Association
• /
• v.11 no.11
• /
• pp.213-220
• /
• 2011

The purpose of the study was to evaluate the effects of sling exercise program on muscle activity and cervical spine curvature of person with forward head posture. The subjects, 25 students, were divided into two groups. This experiment was intended to examine the muscle activity and cervical spine curvature while the subjects had performed the exercises to do for 2 times/week and 4 weeks. The factors of FHP were measured cranial vertical angle, cranial rotation angle, muscular activity and cervical spine curvature. Cervical spine curvature measured craniovertical, craniocervical, cervicohorizontal and upper cervical angle. Collected data were statistically analyzed by SPSS 10.0. After experiment for 4 weeks period, results were as following: Both group was significant difference of the results according to the CVA. Exercise group are more effective to increase muscle activity (p<.05), but cervical spine curvature was no significant difference. This result, we could find out there was a significant correlation between sling exercise and muscle activity, CVA and CRA.