• Steel and Composite Structures
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• 제6권2호
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• pp.87-101
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• 2006

The deformation and dynamic behavior mechanism of submerged shell-like lattice structures with membranes are in principle of a non-conservative nature as circulatory system under hydrostatic pressure and disturbance forces of various types, existing in a marine environment. This paper deals with a characteristic analysis on quasi-periodic and chaotic behavior of a circular arch under follower forces with small disturbances. The stability region chart of the disturbed equilibrium in an excitation field was calculated numerically. Then, the periodic and chaotic behaviors of a circular arch were investigated by executing the time histories of motion, power spectrum, phase plane portraits and the Poincare section. According to the results of these studies, the state of a dynamic aspect scenario of a circular arch could be shifted from one of quasi-oscillatory motion to one of chaotic motion. Moreover, the correlation dimension of fractal dynamics was calculated corresponding to stochastic behaviors of a circular arch. This research indicates the possibility of making use of the correlation dimension as a stability index.

• 의정연구
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• 제27권1호
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• pp.117-155
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• 2021

이 연구의 목적은 포퓰리즘 수요측면에서 대중의 이념 정향과 포퓰리즘 성향의 관련성을 규명하는 것이다. 구체적으로 주관적 이념평가와 정당지지가 포퓰리즘 성향, 즉 반엘리트주의, 인민 중심주의, 반다원주의에 미친 영향을 분석하였다. 이를 위해 사회경제적 요인과 민주주의 인식 및 정치참여 방식 등을 통제변수로 설정하고, 독립변수 중 이념은 극보수·보수·중도·진보·극진보로 세분화하였다. 자료는 전국 단위의 온라인 설문조사를 통해 수집하였다. 분석결과, 첫째, 이념 정향과 포퓰리즘 성향 간의 강력한 친화성을 확인하였다. 보수 이념(특히 극보수)과 보수정당 지지는 반엘리트주의와 반다원주의에, 그리고 극진보 이념과 진보정당 지지는 인민 중심주의와 반다원주의를 추동하였다. 그리고 세 가지 성향을 종합한 결과에서는 보수(특히 극보수)와 극진보 이념이 포퓰리즘 성향을 결정하는 요인이었다. 둘째, 성별(여성)과 연령을 제외한 사회경제적 변수의 영향력은 나타나지 않았다. 셋째, 포퓰리즘 성향은 민주주의 만족도, 정부 신뢰, 외적 효능감, 투표 및 비투표 활동에 의해서 결정되는 다차원적 성격을 가졌다.

• Restorative Dentistry and Endodontics
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• 제47권3호
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• pp.26.1-26.10
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• 2022

Wegener's granulomatosis (WG) is a condition with immune-mediated pathogenesis that can present oral manifestations. This report describes the case of a patient diagnosed with WG 14 years previously, who was affected by persistent pain of non-odontogenic origin after successful endodontic treatment. A 39-year-old woman with WG was diagnosed with pulp necrosis and apical periodontitis of teeth #31, #32, and #41, after evaluation through a clinical examination and cone-beam computed tomography (CBCT). At the first appointment, these teeth were subjected to conventional endodontic treatment. At 6- and 12-month follow-up visits, the patient complained of persistent pain associated with the endodontically treated teeth (mainly in tooth #31), despite complete remission of the periapical lesions shown by radiographic and CBCT exams proving the effectiveness of the endodontic treatments, thus indicating a probable diagnostic of persistent pain of non-odontogenic nature. After the surgical procedure was performed to curette the lesion and section 3 mm of the apical third of tooth #31, the histopathological analysis suggested that the painful condition was likely associated with the patient's systemic condition. Based on clinical, radiographic, and histopathological findings, this unusual case report suggests that WG may be related to non-odontogenic persistent pain after successful endodontic treatments.

• 대한산업공학회지
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• 제26권4호
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• pp.392-401
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• 2000

In this work, a deadlock avoidance strategy is proposed in order to effectively handle conflicts and deadlocks occurring in zone-control AGV (Automated Guided Vehicle) systems. The basic idea is based on Capacity-designated Directed Graph (CDG) theory that was developed to avoid from deadlocks in manufacturing systems. However, to enforce the effectiveness of detecting impending and restricted deadlocks, AGV routings are explicitly described in Extended Directed Graph (EDG). From EDG, a non-conservative deadlock-avoidance strategy is derived. The superiority of the proposed strategy lies on the applicability to diverse AGV path configurations using zone control. Also, because of its insensibility and robustness, it can be effectively used when the system has randomness and stochastic nature.

• Restorative Dentistry and Endodontics
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• 제46권3호
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• pp.40.1-40.12
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• 2021

Objectives: The purpose of this study was to critically evaluate the quality, reliability and educational content of the information of vital pulp treatment videos available on YouTube. Materials and Methods: The keywords "pulpotomy" and "pulp capping" were searched on YouTube on 5th July 2020, until 60 English language videos of each search term with a duration shorter than 15 minutes were acquired. Video characteristics were recorded and Video Power Index (VPI) was calculated. Reliability and educational quality of videos were evaluated using the Modified DISCERN score, the Journal of American Medical Association (JAMA) benchmark criteria and Global Quality Scores (GQS). Videos were categorized by uploading source. Results: Regarding pulpotomy, 31.7% of the videos were uploaded by specialists and 68.3% were directed by non-specialists. In the case of pulp capping, the corresponding percentages were 45% and 55%, respectively. Videos uploaded by specialists had significantly higher modified DISCERN, JAMA and GQS scores compared to those uploaded by non-specialists. Endodontists tended to have the highest reliability and VPI scores. Conclusions: YouTube videos on vital pulp treatment contain low educational quality or incomplete information. Low popularity of dental pulp capping and pulpotomy videos may be attributed to the specialized nature of these procedures. As YouTube represents an important source for patient information about different health topics, reliable informative videos should be uploaded by specialized dental professionals.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제39권3호
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• pp.127-133
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• 2013

Objectives: Infererior alveolar nerve (IAN) damage may be one of the distressing complications occurring during implant placement. Because of nature of closed injury, a large proportion is approached non-invasively. The purpose of this study was to analyze the outcomes of conservative management of the injured nerve during dental implant procedure. Materials and Methods: Sixty-four patients of implant related IAN injury, who were managed by medication or observation from January 1997 to March 2007 at the Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital, were retrospectively investigated. The objective tests and subjective evaluations were performed to evaluate the degree of damage and duration of sensory disturbance recovery. Tests were performed on the day of the first visit and every two months afterward. Patient's initial symptoms, proximity of the implant to the IAN, time interval between implant surgery and the first visit to our clinic, and treatment after implant surgery were analyzed to determine whether these factors affected the final outcomes. Results: Among the 64 patients, 23 had a chief complaint of sensory disturbance and others with dysesthesia. The mean time until first visit to our hospital after the injury was 10.9 months.One year after nerve injury, the sensation was improved in 9 patients, whereas not improved in 38 patients, even 4 patients experienced deterioration. Better prognosis was observed in the group of patients with early visits and with implants placed or managed not too close to the IAN. Conclusion: Nearly 70% of patients with IAN injury during implant placement showed no improvement in sensation or dysesthesia with the conservative management. Earlier decision for active treatment needs to be considered because of possibility of deterioration of symptoms and unsatisfactory recovery.

• 한국안전학회지
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• 제35권3호
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• pp.96-104
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• 2020

The numerical simulations were conducted to investigate the thermal-fluid phenomena occurred inside the experimental apparatus during a PCCS, used to remove heat released in accidents from a containment of light water nuclear power plant, operation. Numerical simulations of the flow and heat transfer caused by wall condensation inside the containment simulation vessel (CSV), which equipped with 18 vertical heat exchanger tubes, were conducted using the commercial computational fluid dynamics (CFD) software ANSYS-CFX. Shear stress transport (SST) and the wall condensation model were used for turbulence closure and wall condensation, respectively. The simulation using the actual size of the apparatus. However, rather than simulating the whole experimental apparatus in consideration of the experimental cases, calculation resources, and calculation time, the simulation model was prepared only in CSV. Selective simulation was conducted to verify the effects of non-condensable gas(NC gas) concentration, CSV internal pressure, and wall sub-cooling conditions. First, as a result of the internal flow of CSV, it was observed that downward flow due to condensation occurred surface of the vertical tube and upward flow occurred in the distant place. Natural convection occurred actively around the heat exchanger tube. Due to this rising and falling internal flow, natural circulation occurred actively around the heat exchanger tubes. Next, in order to check the performance of built-in condensation model using according to the non-condensable gas concentration, CSV internal flow and wall sub-cooling, the heat flux values were compared with the experimental results. On average, the results were underestimated with and error of about 25%. In addition, the influence of CSV internal pressure and wall sub-cooling was small, but when the condensate was highly generated due to the low non-condensable gas concentration, the error was large compared to the experimental values. This is considered to be due to the nature of the condensation model of the CFX code. However, in spite of the limitations of CFD, it is valid to use the built-in condensation model of CFD for PCCS performance prediction from a conservative perspective.

• 복식
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• 제57권10호
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• pp.129-141
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• 2007

In the cultural realm of Hinduism centering around India, traditional costumes such as Sari, and Dhoti are worn up to date under the influence of religious faith, tradition, and fundamentalism. The purpose of this study is to clarify the religious meaning of unstitched traditional Indian costume and inquire into the figurative beauty of it. This study revolved around India, and the aesthetic feature affected by hinduism was examined based on the literature references and the figurative feature and aesthetic value of unstitched costume were analyzed. The most important feature of Indian costume is the unstitched costume without joining pieces of cloth by using a needle and thread, symbolizing the purity based on the cosmology of Hindu. In the unstitched costume of India, natural drapery that is the large cloth, slipped or tied on body, wrapping it affluently, is emphasized. Unstitched costume of India, based on cosmology of Hindu and the concept of purity, is still broadly worn by people under the influence of fundamentalism and conservative atmosphere. Religious idea is expressed and a beauty of concealment, emphasizing the chastity, is shown in the unstitched costume of India, while a beauty of nature is distinctively revealed in the non-structural and asymmetric drapery costume due to the unique wearing style. In addition, 'A beauty of symbolism' appears in the wearing method, color, the part of wearing, and ornament. Religion has affected overall culture that is inclusive art, aesthetics, and social structure and has contributed to the formulation of costume style. Unstitched costume of India is the unique tradition of India and identity, based on the religious idea.

• 의정연구
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• 제24권1호
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• pp.203-239
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• 2018

사회의 복지균열이 정당경쟁으로 제도화되고 책임 있는 정당들에 의하여 사회적 이익이 대표될 때, 책임정치와 정당정치가 지방정치에서 실현된다. 본 연구는 개별적인 정치요인, 특히 정당요인과 경쟁요인 사이의 상대적인 영향력을 분석하여 복지지출에 중요한 영향을 미치는 요인과 주변적인 영향요인을 구분하여 분석하고자 한다. 또한, 복지지출에 미치는 정치적 영향의 비선형(non-linear) 관계에 주목한다. 2007년, 2011년, 2015년 한국의 전체 기초지방정부를 대상으로 복지지출 결산에 미치는 결정요인을 분석하였다. 분석결과, 첫째, 단체장과 지방의회의 정당요인이 복지지출에 유의미하게 영향을 미치고 있으며, 선행연구에서 주장되어온 단점/분점요인과 단체장의 선거경쟁도는 복지지출에 영향을 미치지 않았다. 둘째, 기초정부의 복지지출은 재정 세입과 세출의 차이로 인하여 정당요인의 영향력이 시 군 구 사이에 다르게 나타났다. 셋째, 지방의회에서 진보정당 의석률의 변화는 복지비 지출과 비선형 관계였으며, 민주당 의석률이 40%와 60%를 기준으로 복지지출에 미치는 영향의 방향이 변화하고 있음을 확인하였다. 이러한 결과를 통해 본 논문은 한나라당 단체장의 보수적 정향은 물론, 무소속 지방의원의 보수성, 민주당 일당지배 지방의회의 보수성과 관련된 시사점을 얻었다.

• 헤리티지:역사와 과학
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• 제54권2호
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• pp.56-77
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• 2021

지명은 인간의 인식 작용이 환경과 만나는 지점 위에 존재하고 있으며, 많은 문화유산의 명칭들은 그 자체가 하나의 지명이거나 지명을 그 이름 속에 포함하고 있다. 따라서 지명유산 속에는 인간 집단과 공동체가 추구하는 정체성과 이데올로기, 그들이 만들어온 총체적 생활 양식, 나아가 소속감과 장소감에 이르는 모든 문화적 상징과 질서들이 내장되어 있으며, 인류 공동체가 소유한 문화와 자연을 외부에 지시하고 상징하고 통합하여 대표한다. 지명유산에 대한 인식을 토대로, 본 연구의 목적은 무형문화유산으로서의 지명의 가치를 정리하고 유형문화유산 관리를 위한 지명 기능의 활용 방안을 제시하는 데 있다. 첫째, 무형문화유산으로서의 지명의 의미를 다룬 장에서는 먼저 문화와 문화 경관 개념에 담긴 중층성과 다양성, 그리고 경관현상학적 비재현성을 살펴본 후 지명 문화유산에 대한 국내외 논의를 제시하였다. 2003년 유네스코가 채택한 '무형문화유산 보호협약'과 연계하여 원주민과 소수민족 등이 소유한 '문화, 유산, 정체성으로서의 지명' 논의를 지명 연구 분야의 선행 연구와 유엔지명표준화회의의 결의안을 중심으로 분석하였다. 이를 기초로 지명이 지니고 있는 문화유산적 특성과 선정 기준을 문화성, 공간성, 역사성, 사회·경제성, 그리고 언어성으로 나누어 사례 지명과 함께 제시하였다. 둘째, 유형문화유산 관리를 위한 지명 실천이란 장에서는 먼저 지명의 지시 기능을 중심으로 문화유산의 합리적인 관리 방안을 제시하였다. 특히 우리나라의 공식 문화재 명칭을 분석하여 명칭의 구성 및 관리에 있어 체계적이고 통일된 원칙이 필요함을 강조하였다. 마지막으로 지명 스케일과 다중-지명영역을 활용하여 역사문화환경 보존지역을 설정하는 방안을 시론적으로 논의하였다. 최근 유산 연구 분야에서 강조되고 있는 공간적 전환과 참여적 전환, 그리고 문화유산을 바라보는 다중적 관점의 필요성을 고려하여 특정 지명 스케일과 다중-지명영역의 선택을 통한 문화재 보호구역 및 역사문화환경 보존지역이 결정되어야 함을 제안하였다.