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      • KCI등재

        태권도 수련생의 참여 동기와 수련환경이 운동지속의도에 미치는 영향

        박홍석,최종운,최종인 한국스포츠학회 2019 한국스포츠학회지 Vol.17 No.3

        The purpose of this study is to analyze the effects of participation motivation and training environment on the exercise adherence intention of Taekwondo trainees. The subjects were sampled from 355 kindergarten, elementary, middle, and high school students receiving training at Taekwondo studios in S City based on convenience sampling. Collected data was treated in frequency analysis, reliability analysis, confirmatory factor analysis, correlation analysis and multiple regression analysis to achieve the research goal. The research process led to the following findings: first, the study analyzed the effects of participation motivation on the exercise adherence intention of Taekwondo trainees and found that pleasure, self-development, and promotion of health had positive(+) effects on tendency in a descending order. Pleasure and self-development had positive effects on possibility and reinforcement in a descending order. Secondly, the study analyzed the effects of training environment on their exercise adherence intention and found that facilities and programs had positive effects on tendency in a descending order. Facilities, programs and access had positive effects on possibility in a descending order. Programs had positive effects on reinforcement. 본 연구는 태권도 수련생의 참여 동기, 수련환경이 운동지속의도에 미치는 영향을 분석하고자 한다. 본 연구의연구대상자는 S시에 위치한 태권도장에서 수련중인 유치원, 초․중․고등학생 355명을 편의표본추출법을 사용하여 선정하였다. 본 연구의 목적을 달성하기 위한 자료처리 방법으로는 빈도분석, 신뢰도 분석, 확인적 요인분석, 상관관계 분석, 그리고 다중회귀분석 방법을 사용하였다. 위와 같은 연구과정을 거쳐 다음과 같은 연구결과를 도출하였다. 첫째, 태권도수련생의 참여 동기가 운동지속의도에 미치는 영향을 분석한 결과 경향성에는 즐거움, 자기개발, 건강증진 순으로, 가능성에는 즐거움, 자기개발이, 강화성에서는 즐거움, 자기개발 순으로 정적(+)영향을 미쳤다. 둘째, 태권도 수련생의 수련환경이 운동지속의도에 미치는 영향을 분석한 결과 경향성에 는 시설, 프로그램 순으로, 가능성에는 시설 프로그램, 접근성 순으로 , 강화성에서는 프로그램이 정적(+)영향을 미치는 것으로 나타났다.

      • KCI등재

        삼차신경종의 자기공명영상소견

        박홍석 대한영상의학회 1997 대한영상의학회지 Vol.37 No.2

        Purpose : To describe the MRI findings of trigeminal neurinoma.Materials and Methods : We retrospectively analyzed the MRI findings of 19 patients with trigeminal neurinomas proven by surgery and pathologic examination. Axial T1- and T2-weighted MR images in all patients and gadolinium-enhanced T1-weighted images in 14 patients were obtained at 2.0T(8 cases), 1.5T(6 cases) or 0.5T(5cases). These were analyzed in terms of tumor size, signal intensity, degree of contrast enhancement, the presence or absence of cystic change and denervation atrophy of the masticator muscles.Results : Clinical manifestations included sensory abnormality or pain(n=12), headache(n=10), impaired visual acuity or diplopia(n=6), hearing loss or tinnitus(n=3), weakness of masticator muscles(n=2), and mass or nasal obstruction(n=2). On MR images, tumor size was seen to average 4.2(range 1.5-6)cm; tumors were located in the posterior cranial fossa(n=8), middle cranial fossa(n=4), ophthalmic nerve(n=2), maxillary nerve(n=1), and mandibular nerve(n=1), and in three cases were dumbbell-shaped and extended into both the middle and posterior cranial fossa. On T1-weighted images, signals were isointense with cortical grey metter, in ten cases(53%), and of low intensity in nine(47%); on T2-weighted images, signals were of high intensity in 15cases(79%) and were isointense in four (21%). Cystic change was seen in 12 cases(63%). After enhancement, all involved the trigeminal ganglion or mandibular nerveConclusion : A trigeminal neurinoma shows similar signal intensity and enhancement to other cranial neurinomas with a higher incidence of cystic degeneration. Its location and shape are characteristic, and where there is involvement of the trigeminal ganglion or mandibular nerve, denervation atrophy may be seen.

      • KCI등재

        성장호르몬분비 뇌하수체선종:임상 및 자기공명영상소견

        박홍석,장기현,한문희,심정석,이상현,송재우,유인규,정희원,연경모 대한영상의학회 1996 대한영상의학회지 Vol.35 No.4

        Purpose : To describe clinical and MRI findings of growth hormone-secreting pituitary adenoma, to determine ifthere are any characteristic MRI findings different from those of other pituitary adenomas, to evaluate therelationship between tumor size and serum growth hormone level, and to assess the results of immunohistochemicalstudy. Materials and Methods : We retrospectively analysed clinical and MRI findings of 29 patients with growthhormone-secreting pituitary adenoma confirmed by serum growth hormone level and surgery. We also evaluated therelationship between the tumor volume and serum growth hormone level, and the results of immunohistochemicalstudy. Coronal and sagittal T1-weighted MR images in all patients and gadoliniumenhanced T1-weighted MR images in28 patients were obtained with 2.0 T(24 cases) and 0.5 T(5 cases) MR imagers. The images were analyzed in terms oftumor size, signal intensity, degree of contrast enhancement, extent of tumor growth and the presence or absenceof cystic change, hemorrhage and calcification. Results : Clinical manifestations included facial feature changeand soft tissue swelling of hands and feet(n=29), headache(n=12), impaired visual acuity(n=9), symptoms ofhyperprolactinemia(n=8), visual field defect(n=5), and others(n=6). On MR images, all of the 29 cases were seen tobe macroadenomas and the size of the tumors averaged 2.2cm(1-5.2 cm). Supra- and infrasellar extensions were seenin 21 and 22 patients, respectively. Cavernous sinus invasion was noted in seven, and in one this was bilateral.Signal intensity was isointense with cortical grey matter in 26 cases(90%). Cystic change or necrosis was seen ineight cases(28%), hemorrhage in four(14%), and calcification in two(7%). After enhancement, most(25/28) of thetumors enhaned less than mormal pituitary in degree. There was no correlation between serum growth hormone leveland tumor size. Immunohistochemical study showed positive growth hormone-secreting cells in only 69%(11/16).Conclusion : Clinical findings in patients with growth hormone-secreting pituitary adenomas were various andincluded acromegaly, headache, visual impairment, and symptoms of hyperprolactinemia, for example. On T1-weightedMR images, all tumor were macroadenoma, and there were no characteristic findings different from those of otherpituitary tumors. The volume of a tumor did not correlate with serum hormone level. Immunohistochemical studyshowed positive growth hormone-secreting cells in a limited number of cases.

      • KCI등재

        사이버 물리적 시스템의 개발 - 가상 자율적 굴삭기

        박홍석,렌곡찬 한국CDE학회 2015 한국CDE학회 논문집 Vol.20 No.3

        Nowadays, automatic digging operation of an excavator is a big challenge due to the complexity of digging environment, the hardness of soil and buried obstacles into the ground. In order to achieve the maximum soil bucket volume, this paper introduces a novel engineering model that was developed as a virtual excavator in the design phase. Through this model, the designs of mechanical and control systems for autonomous excavator are executed and modified easily before developing in real testbed. Based on a concept of an autonomous excavation, a mechanical system of excavator was first designed in SOLIDWORKS, and a soil model also was modeled by finite-element analysis in ANSYS, both modeled models were then exported to ADAMS environment to investigate the digging behavior through virtual simulation. An intelligent control strategy was generated in MATLAB/Simulink to control the excavator operation. The simulation results were demonstrated by effectiveness of the proposed excavator robot in testing scenarios with many soil types and obstacles.

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