• 대한두경부종양학회:학술대회논문집
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• 1996.11a
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• pp.255-256
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• 1996

• 대한두경부종양학회:학술대회논문집
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• 1998.11a
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• pp.295-296
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• 1998

• Journal of the Economic Geographical Society of Korea
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• v.13 no.3
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• pp.312-334
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• 2010

This paper examines the process of Gyeongbu Highway construction from the standpoint of political economy, which was pursued by President Park Jeong-Hee in the 1960s, focusing on the politics of mobility and demarcation implied in it. As results of examination, it can be argued that Gyeongbu Highway was seen as a powerful element to promote a socio-spatial integration of population and hence to enforce an authoritative political power of the Park regime through creation of mobility; that it has had an strong impact on changing the physical landscape of national space and the spatio-temporal rhythm of everyday life by extending the 'machine space' as a non-place; that it has provided a physical infrastructure on which the period of capital circulation could be reduced through its effect of space-time compression. But Gyeongbu Highway has led serious problems such as uneven regional development, expansion of non-place or alienated place, ecological destruction and pollution. In conclusion, a sustainable politics is suggested to overcome this kind of 'tragedy of highway' and to develop the highway as a true way of political and spatial balance and integration.

• Journal of Dental Rehabilitation and Applied Science
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• v.24 no.3
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• pp.299-310
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• 2008

In this study, the regression analysis method was tested for the estimation of peak stress at stress concentration area in the cervical bone. Submerge type EZ plus implant (Megagen. Daegu, Korea), 4.1 mm in cervical diameter and 9.6 mm in endosseous length, were axisymmetrically modelled together with surrounding alveolar bone of which the width was 10 mm. Vertical force of 100 N was applied to a head of crown above 8.5 mm from the outer surface of the cortical bone. Four different mesh models were composed of differently sized elements in vicinity of sharp corners, and they include 6 stress monitoring points that are located in the same geometrical points regardless of the differences in the meshes. Primary consideration was given to the stresses in the cortical bone surrounding the implant neck. The results showed that virtually all the stresses were concentrated in the cortical bone regardless of mesh designs. The peak stresses were successfully calculated by a regression analysis in a stable manner, as far as the mesh is designed to represent the acute gradient of stresses near the sharp corner.

• Proceedings of the KOR-BRONCHOESO Conference
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• 2003.09a
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• pp.108-108
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• 2003

식도 천공의 치료는 최근 치료법의 발전에도 불구하고 여전히 난해한 문제이다. 이 환자들은 천공의 원인이나 위치, 심한 정도가 다양한 이질적인 군이며, 반수 이상이 이미 식도에 기존의 질환을 가지고 있어 문제를 더욱 복잡하게 한다. 따라서 절대적이고 획일적인 치료방법은 아직 확립되어 있지 않으며 많은 다양한 방법들이 제시되고 있다. 2002년 11월부터 2003년 7월까지 총 8명의 환자가 식도 천공으로 동아대학교병원 흥부외과에서 치료를 받았으며, 원인별로는 의인성(iatrogenic) 손상이 6례, 자발성(spontaneous) 손상이 2례였고 부위별로는 경부가 3례, 흥부가 5례였다. 의인성 손상에는 내시경 검사중 정상 경부 식도에 발생한 1례, 부식성 식도협착 환자의 풍선 확장술과 스텐트 삽입시 흉부 식도에 발생한 경우가 각각 1례씩, 외상성 경추손상의 수술시 정상 경부 식도에 발생한 경우가 2례, 선천성 식도폐쇄증(esophageal atresia)의 술후 문합부 누출이 생긴 경우가 1례 있었으며, 자발성 손상에는 하부식도에 발생한 기압성(barogenic) 손상 1례와 상흉부 식도암 천공 1례가 있었다. 경부 식도 천공 3례는 모두 경부 배액(drainage)과 식이용 장루술(feeding jejunostomy)을 시행하였고, 부식성 식도협착이 있던 환자 2례는 식도절제술과 흉부내 식도-위 문합을 시행하였으며, Boerhaave씨 증후군 환자는 1차 봉합술, 술후 문합부 유출이 있었던 환자와 식도암 천공이 있었던 환자는 식도절제 및 경부 식도루(esophagostomy), 배액용 위루(gastrostomy), 식이용 장루술을 시행하였다. 모든 환자는 패혈증 등의 심각한 합병증으로의 진행 없이 회복되었다. 현재 위장관의 연속성이 유지 혹은 복원된 환자는 경구식이 중이며 그 외의 환자들은 장루를 통해 영양을 공급하며 식도재건술을 기다리고 있다. 식도 천공은 최근 항생제의 사용, 과영양요법(hyperalimentation), 술후 환자관리의 개선 등으로 치료에 많은 발전이 있었으나, 치료 방침에 있어서는 여전히 논란이 있으며 높은 사망률을 보이는 난제로 남아있다. 비록 일반적인 지침이 도움이 되겠지만, 치료 방침은 환자 개개인의 상황에 따라 적절하게 선택해야 하며, 임상경과에 따라 언제라도 방침을 변경할 수 있는 유연함이 필요하리라 생각한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.2D
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• pp.181-190
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• 2010

The purpose of this study is to propose an effective approach of making route decisions for the large-scale national project (i.e. the KTX Gyeongbu line between Daegu and Busan) by analyzing the conflicts that had occurred in the process of selecting the routes and stations. This study investigated policy making processes and conflicts during the construction of the KTX Gyeongbu line. The five contentious issues were 1) selecting the route between Daegu~Busan line, 2) developing a new route through Gyeongju areas, 3) making decisions of the first and second phases of construction, 4) setting up an extra station in Ulsan, and 5) conflicts of the Mt. Cheonseong route in Yangsan. In terms of analyzing these issues, the current study focuses on dealing with notions of technical, economical, legal, social, and practical rationality. Based on such analyses and implications, this study proposes a relatively reasonable model of line decision making especially for long-distance intercity routes. It also turns out that the large-scale project like the development of KTX Gyeongbu line should be conducted after receiving enough quantitative evaluation by reviewing relevant technical research studies and economic analyses, and having social agreements to prevent plausible conflicts.

• Progress in Medical Physics
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• v.27 no.1
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• pp.14-24
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• 2016

Since the head and neck region is densely located with organs at risk (OAR), OAR-sparing is an important issue in the treatment of head and neck cancers. This study-in which different treatment plans were performed varying the head tilt angle on brain tumor patients-investigates the optimal head elevation angle for sparing normal organs (e.g. the hippocampus) and further compares the dosimetric characteristics of different types of radiation equipment. we performed 3D conformal radiation therapy (3D-CRT), intensity-modulated radiation therapy (IMRT), and tomotherapy on 10 patients with brain tumors in the frontal lobe while varying the head tilt angle of patients to analyze the dosimetric characteristics of different therapy methods. In each treatment plan, 95% of the tumor volume was irradiated with a dose of 40 Gy in 10 fractions. The step and shoot technique with nine beams was used for IMRT, and the same prescription dose was delivered to the tumor volume for the 3D-CRT and tomotherapy plans. The homogeneity index, conformity index, and normal tissue complication probability (NTCP) were calculated. At a head elevation angle of $30^{\circ}$, conformity of the isodose curve to the target increased on average by 53%, 8%, and 5.4%. In 3D-CRT, the maximum dose received by the brain stem decreased at $15^{\circ}$, $30^{\circ}$, and $40^{\circ}$, compared to that observed at $0^{\circ}$. The NTCP value of the hippocampus observed in each modality was the highest at a head and neck angle of $0^{\circ}$ and the lowest at $30^{\circ}$. This study demonstrates that the elevation of the patients' head tilt angle in radiation therapy improves the target region's homogeneity of dose distribution by increasing the tumor control rate and conformity of the isodose curve to the target. Moreover, the study shows that the elevation of the head tilt angle lowers the NTCP by separating the tumor volume from the normal tissues, which helps spare OARs and reduce the delivered dose to the hippocampus.

• The Journal of Korean Academy of Prosthodontics
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• v.47 no.4
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• pp.385-393
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• 2009

Statement of problem: High stress concentration on the crestal cortical bone has been regraded as a major etiologic factor jeopardizing long term stability of endosseous implants. Purpose: To investigate if the design characteristics of crestal module, i.e. internal type, external type, and submerged type, affect stress distribution on the crestal cortical bone. Material and methods: A cylindrical shaped implant, 4.3 mm in diameter and 10 mm in length, with 3 different crestal modules, i.e. internal type, external type, and submerged type, were analysed. An axisymmetric scheme was used for finite elment formulation. A vertical load of 50 N and an oblique load of 50N acting at $45^{\circ}$ with the implant's long axis was applied. The peak crestal bone stress acting at the intersection of implant and crestal bone was compared. Results: Under vertical load, the crestal bone stress was high in the order of internal, external, and submerged types. Under the oblique loading condition, it was in the order of internal, submerged, and external types. Conclusion: Crestal module design was found to affect the level of the crestal bone stresses although the actual amount was not significant.

• Korean Journal of Dental Materials
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• v.45 no.4
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• pp.287-300
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• 2018

The aim of this study was to compare the morphological characteristics of two types of stainless steel permanent molar crowns using three-dimensional scanners and the morphological changes of these crowns after crimping. Two types of stainless steel permanent molar crowns, PO-96 and PERMACROWN were scanned using three-dimensional scanner. Crown size, crown index (ratio of buccolingual diameter to mesiodistal diameter at height of contour), cervical convergency of crown were measured. Stainless steel crowns were crimped and re-scanned with three-dimensional scanner. Morphological changes of stainless steel permanent molar crowns were analyzed. As for the crown index, maxillary PERMACROWN was larger buccolingually and smaller mesiodistally than maxillary PO-96 and mandibular PERMACROWN was smaller buccolingually and larger mesiodistally than mandibular PO-96. Maxillary PO-96 was more convergent to cervical mesiodistally than maxillary PERMACROWN and mandibular PO-96 was more convergent to the cervical mesiodistally, buccolingually than mandibular PERMACROWN. Both types of stainless steel permanent molar crowns showed reduction of cervical circumference after crimping. Two products were morphologically different in crown size, shape and cervical convergence. Although both types of stainless steel permanent molar crowns are pre-contoured type, additional crimping is needed to achieve better marginal adaptation.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.12
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• pp.43-51
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• 2020

This study examined how the eight-week spinal stabilization exercise program affects the cervical disability index, postural balance ability, and body shape change. The exercise program performed 60 minutes of spinal stabilization exercise three times a week for eight weeks. Sixteen patients with chronic neck pain, who complained of neck pain for six months, were classified into exercise group (n=8 patients) and control group (n=8 patients). The results before and after the eight-week exercise program were observed. Significant differences were observed in the time, group, and interaction of the neck disability index (p<.05). The balance ability showed significant interaction effects between the groups and periods (p<.05). Significant differences were noted in the timing and interaction in the pelvic inclination angle in posture change (p<.05), and there were significant differences in the group, timing, group, and interaction in the cervical and shoulder position angles (p<.05). The above results showed that the spinal stabilization exercise significantly improved the cervical disability index, balance ability change, and body shape change in patients with chronic neck pain. Future studies will analyze the specific changes in spinal structure through radiographic imaging to increase the validity of spinal stabilization exercise.