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Jeongil Heo,Yonghwan Kim,Taeksu Shin 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.7
We designed and manufactured a 28-GHz electron cyclotron resonance ion source (ECRIS) to obtain a steady heavy-ion beam. The ECRIS consists of various equipment for beam extraction and transmission, such as superconducting magnet, electro static quadrupole (ESQ), pair solenoid magnet, dipole magnet and etc. For the support frame of ECRIS, it is necessary to use a material with high strength must be used for stable support, and it should be easy to assemble for installation. In addition, dielectric breakdown should not occur at a high voltage applied when the beam is extracted. The manufactured frame is currently made of steel pipe, which has excellent in strength and dielectric characteristic. However assembly and installation is not convenient due to weight, corrosion, welding, etc. In order to overcome this problem, we redesigned a new frame using an aluminum profile. the advantages of the aluminum profile are easy acquisition, low cost, high strength, and easy assembly and installation. However, dielectric breakdown may occur at the edge of the aluminum profile. Therefore, a high-voltage electricfield analysis is required to design the support frame of the ECRIS. This paper, reports on the design of a high voltage support frame through an electricfield analysis using a finite element method (FEM) and a breakdown experiment.
Kang, Jeongil,Jeong, Daekeun,Heo, Sinhaeng International Academy of Physical Therapy Research 2021 Journal of International Academy of Physical Ther Vol.12 No.2
Background: Stroke patients have weak trunk muscle strength due to brain injury, so a single type of exercise is advised for restoring functionality. However, even after intervention, the problem still lies and it is suggested that another intervention method should be applied with exercise in order to deal with such problem. Objectives: To Investigate the effect of bridge exercise combined with functional electrical stimulation (FES) on trunk muscle activity and balance in stroke patients. Design: Randomized controlled trial. Methods: From July to August 2020, twenty stroke patients was sampled, ten patients who mediated bridge exercises combined with functional electrical stimulation were assigned to experiment group I, and ten patients who mediated general bridge exercises were assigned to experiment groupII. For the pre-test, using surface EMG were measured paralyzed rectus abdominis, erector spinae, transverse abdominis/internal oblique muscle activity, and using trunk impairment scale were measured balance. In order to find out immediate effect after intervention, post-test was measured immediately same way pre-test. Results: Change in balance didn't show significant difference within and between groups, but muscle activity of trunk was significant difference rectus abdominis and erector spinae within groups I (P<.01), also between groups was significant difference (P<.05). Conclusion: Bridge exercise combined with FES could improve trunk function more effectively than general bridge exercise due to physiological effect of functional electrical stimulation.
Metal Beam Extraction Experiment of a SC-ECRIS at the RAON Accelerator
Yonghwan Kim,Jeongil Heo,Taeksu Shin,Hironobu Ishiyama 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.7
We designed and fabricated a sputtering source with a simple structure to extract metal beam for the RAON heavy ion accelerator. As a test material, Bi with a mass number of 209 was selected, and a beam extraction experiment was conducted. A Bi25+ beam with a current of 3 euA was extracted during the preliminary beam extraction experiment. We confirmed that impurity control and a high-power comparative experiment are necessary for future experiments.
간세포암종에서 초치료로 양성자를 사용하여 양호한 결과를 보인 증례 1예
오진명 ( Jinmyeong Oh ),신동현 ( Dong Hyun Sinn ),성결 ( Gyeol Seong ),정혜교 ( Hye Gyo Chung ),허찬미 ( Chanmi Heo ),유정일 ( Jeongil Yu ),박희철 ( Hee Chul Park ) 대한간암학회 2018 대한간암학회지 Vol.18 No.1
Although first-line treatment option for single, small sized hepatocellular carcinoma in patients with preserved liver function and good performance status is resection or ablation, sometimes these modalities cannot be applied for variable reasons. For them, alternative options such as transarterial chemoeombolization, ethanol injection, and external radiation therapy can be considered, with variable success rates. Herein, we describe 45 year-old male who presented with a single small tumor located at caudate lobe. After multi-disciplinary discussion, the patient was treated with proton beam therapy, which resulted in favorable treatment outcome. (J Liver Cancer 2018;18:80-85)
물리치료사의 직무만족 및 직무몰입에 영향을 미치는 직무스트레스 요인 분석
박승규,박준모,양대중,강정일,김제호,정대근,허재원,Park, Seungkyu,Park, Joonmo,Yang, Daejung,Kang, Jeongil,Kim, Jeho,Jeong, Daekeun,Heo, Jaewon 대한통합의학회 2017 대한통합의학회지 Vol.5 No.3
Purpose : This study was conducted to analyze the job stress factors affecting the job satisfaction and job involvement of physical therapists and to provide basic information for the prevention of job stress among physical therapists. Method : One hundred and eighty-four physical therapists working in hospitals participated in the study by completing the Korean Occupational Stress Scale and surveys about job satisfaction and job involvement. The results were collected and analyzed. Result : The job stress factors the significantly influenced job satisfaction are the following, in order of importance: the organizational climate (p<.05), inter-personal conflict (p<.01), insufficient job control (p<.001), lack of reward (p<.001), and the occupational system (p<.001). The following factors significantly influenced job involvement, again in order of importance: job demand (p<.001), the organizational climate (p<.05), lack of reward (p<.05), the occupational system (p<.01), and insufficient job control (p<.001). Conclusion : The purpose of this study was to analyze the job stress factors affecting the job satisfaction and job involvement of physical therapists and to provide basic information to prevent job stress among physical therapists. The results indicate the need for more studies that analyze the job stress factors of physical therapists and additional studies that specifically analyze the tasks of physical therapists. Studies on how to reduce job stress among physical therapists must also be conducted in the future.