• Journal of Korean Neurosurgical Society
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• 제65권2호
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• pp.245-254
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• 2022

Objective : The etiology of angiographically occult spontaneous subarachnoid hemorrhage (AOsSAH) is unclear. Three-dimensional (3D) high-resolution vessel wall magnetic resonance imaging (HVM) might be useful in detecting the hidden arterial wall angiopathy in patients with AOsSAH. We aimed to demonstrate the feasibility of HVM for detecting the arterial cause of AOsSAH. Methods : Patients, who were diagnosed with AOsSAH in the first evaluations and underwent HVM, were enrolled. Their clinical and radiologic data were retrospectively reviewed. Especially, focal enhancement of arterial wall on HVM and repetitive catheterized angiograms were precisely compared. Results : Among 251 patients with spontaneous SAH, 22 patients were diagnosed with AOsSAH in the first evaluations (8.76%). After excluding three patients who did not undergo 3D-HVM, 19 patients were enrolled and classified as convexal (n=2) or perimesencephalic (n=4), and diffuse (n=13) groups. In convexal and perimesencephalic groups, no focal enhancement on HVM and no positive findings on repetitive angiography were noted. In diffuse group, 10 patients showed focal enhancement of arterial wall on HVM (10/13, 76.9%). Repeated angiography with 3D reconstruction revealed four patients of angiographically positive causative arteriopathy and possible lesion in one case in the concordant location of intramural enhancement on 3D-HVM (5/10, 50%). Three of them were treated with endovascular stent insertion. All patients, except one, recovered with good clinical outcome (3-month modified Rankin score, 0 and 1). Conclusion : 3D-HVM was useful in detecting hidden true arteriopathy in AOsSAH. It may provide new insights into the etiologic investigation of AOsSAH by proving information about the arterial wall status.

• Journal of Radiation Protection and Research
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• 제47권2호
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• pp.67-76
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• 2022

Background: We conducted a cross-sectional study of residents within and outside Fukushima Prefecture to clarify their perceptions of the need for smartphone applications (apps) for explaining exposure doses. The results will lead to more effective methods for identifying target groups for future app development by researchers and municipalities, which will promote residents' understanding of radiological situations. Materials and Methods: In November 2019, 400 people in Fukushima Prefecture and 400 people outside were surveyed via a web-based questionnaire. In addition to basic characteristics, survey items included concerns about radiation levels and intention to use a smartphone app to keep track of exposure. The analysis was conducted by stratifying responses in each region and then cross-tabulating responses to concerns about radiation levels and intention to use an app by demographic variables. The intention to use an app was analyzed by binomial logistic regression analysis. Text-mining analyses were conducted in KH Coder software. Results and Discussion: Outside Fukushima Prefecture, concerns about the medical exposure of women to radiation exceeded 30%. Within the prefecture, the medical exposure of women, purchasing food products, and consumption of own-grown food were the main concerns. Within the prefecture, having children under the age of 18, the experience of measurement, and having experience of evacuation were significantly related to the intention to use an app. Conclusion: Regional and individual differences were evident. Since respondents differ, it is necessary to develop and promote app use in accordance with their needs and with phases of reconstruction. We expect that a suitable app will not only collect data but also connect local service providers and residents, while protecting personal information.

• 대한전자공학회논문지SP
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• 제47권2호
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• pp.20-32
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• 2010

기존 모션 캡쳐의 경우, 고가의 장비나 사용의 복잡도, 동작자의 움직임 제한 등 모션 캡쳐의 어려움이 있었다. 최근 실시간으로 모션 캡쳐가 가능한 컴퓨터 비젼 기반 시스템에 대한 연구가 활발히 진행되고 있다. 본 논문에서는 다시점 영상으로부터 쉽고, 빠르게 추출할 수 있는 피부색과 정확한 3차원 복원을 위한 2차원 영상 좌표 보정을 사용하여 효율적인 다시점 영상 분석 알고리즘을 제안한다. 동작자의 피부색을 검출하고, 카메라 보정 및 에피폴라 기하학 정보를 이용하여 보다 정확한 영상 분석, 그라고 칼만 필터(Kalman filter)를 사용한 추적 등을 통해 보다 안정적인 모션 캡쳐가 가능하게 된다. 실험결과를 통하여, 제안된 방법은 보다 정확한 위치 추정 및 살시간 모션 캡쳐를 위한 알고리즘임을 보여주고 있다.

• Steel and Composite Structures
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• 제19권3호
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• pp.569-583
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• 2015

Recent years, explosive welding structures have been widely used in many engineering fields. The bonding state detection of explosive welding structures is significant to prevent unscheduled failures and even catastrophic accidents. However, this task still faces challenges due to the complexity of the bonding interface. In this paper, a new method called dual-tree complex wavelet transform based permutation entropy (DTCWT-PE) is proposed to detect bonding state of such structures. Benefiting from the complex analytical wavelet function, the dual-tree complex wavelet transform (DTCWT) has better shift invariance and reduced spectral aliasing compared with the traditional wavelet transform. All those characters are good for characterizing the vibration response signals. Furthermore, as a statistical measure, permutation entropy (PE) quantifies the complexity of non-stationary signals through phase space reconstruction, and thus it can be used as a viable tool to detect the change of bonding state. In order to more accurate identification and detection of bonding state, PE values derived from DTCWT coefficients are proposed to extract the state information from the vibration response signal of explosive welding structure, and then the extracted PE values serve as input vectors of support vector machine (SVM) to identify the bonding state of the structure. The experiments on bonding state detection of explosive welding pipes are presented to illustrate the feasibility and effectiveness of the proposed method.

• 대한전자공학회논문지SP
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• 제45권6호
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• pp.44-56
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• 2008

기존 모션 캡쳐의 경우, 고가의 장비나 사용의 복잡도, 동작자의 움직임 제한 등 모션 캡쳐의 어려움이 있었다. 최근 실시간으로 모션 캡쳐가 가능한 컴퓨터 비젼 기반 시스템에 대한 연구가 활발히 진행되고 있다. 본 논문에서는 다시점 영상으로부터 쉽고, 빠르게 추출할 수 있는 피부색과 정확한 3차원 복원을 위한 2차원 영상 좌표 보정을 사용하여 효율적인 다시점 영상 분석 알고리즘을 제안한다. 동작자와 피부색을 검출하고, 카메라 보정 및 에피폴라 기하학 정보를 이용하여 보다 정확한 영상 분석, 그리고 칼만 필터(Kalman filter)를 사용한 추적 등을 통해 보다 안정적인 모션 캡쳐가 가능하게 된다. 실험결과를 통하여, 제안된 방법은 보다 정확한 위치 추정 및 실시간 모션 캡쳐를 위한 알고리즘임을 보여주고 있다.

• 한국임상수의학회지
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• 제24권2호
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• pp.280-283
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• 2007

A 6-year-old male dog was referred to Animal Medical Center, Chonbuk National University with large distal extremity abrasion wound to the hind limb by automobile accident. The wound was reconstructed with an autogenous, full-thickness skin mesh graft. The graft was harvested from the ventrolateral abdominal wall and transplanted to the wound. The skin mesh graft survived successfully without any noticeable complications. Successful grafting requires asepsis, an adequately prepared recipient bed through the surgical debridement and lavage, proper harvesting and preparation of the graft. Full-thickness skin mesh graft has lesser skin contraction which prevents formation of scar. Meshing the graft provides more graft flexibility over uneven, convex and concave surfaces and allows adequate drainage. The full-thickness skin mesh graft can be successfully used for the treatment of large distal skin wounds in dogs.

• 기록학연구
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• 제52호
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• pp.39-58
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• 2017

역사 기록 분야 정부조직은 기록 생산 이전과 생산 영역을 통제할 수 있어야 하며, 모든 유형의 기록과 대통령기록 비밀기록을 관리할 수 있어야 한다. 또한 공공정보의 관리와 공개 등의 기능을 수행해야 한다. 아울러 역사기록의 편찬 등도 수행해야 한다. 곧 이상적인 조직 재구성 방향은 정보 관리와 공개, 기록관리, 기록 편찬, 기억의 영역까지 포괄하는 것이라 할 수 있다. 조직 개혁 방안은 열린 정부 투명성 책임성 등의 정부조직개편 원칙에 부합해야 한다. 조직 개혁 방안은 '두 길 보기'라는 시각에서 접근할 필요가 있다. 국가 기록과 기억 관리를 담당하는 기구로 "국가기록처" 또는 "국가기억위원회" 설립을 제안하고자 한다. 국가 기억의 범위를 공공영역에 한정하는 것이 아니라, 'total archives' 관점에서 사회 전체를 포괄하는 기능을 수행할 수 있도록 설계하는 방안이다. 이 기구는 독립성이 보장되는 형태로 조직할 것을 제안한다.

• 자동차안전학회지
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• 제13권3호
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• pp.78-85
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• 2021

Recently a traffic accident of heavy duty vehicles under the mandatory installation of ADAS (Advanced Driver Assistance System) is often reported in the media. Heavy duty vehicle accidents are normally occurring a high number of passenger's injury. According to report of Insurance Institute for Highway Safety, FCW (Forward Collision Warning) and AEB (Automatic Emergency Braking) were associated with a statistically significant 12% reduction in the rate of police-reportable crashes per vehicle miles traveled, and a significant 41% reduction in the rear-end crash rate of large trucks. Also many countries around the world, including Korea, are studying the effects of ADAS installation on accident reduction. Traffic accident statistics of passenger vehicle for business purpose in TMACS (Traffic safety information Management Complex System in Korea) tends to remarkably reduce the number of deaths due to the accident (2017(211), 2018(170), 2019(139)), but the number of traffic accidents (2017(8,939), 2018(9,181), 2019(10,095)) increases. In this paper, it is introduced a traffic accident case that could lead to high injury traffic accidents by being equipped with AEB in a bus. AEB reduces accidents and damage in general but malfunction of AEB could occur severe accident. Therefore, proper education is required to use AEB system, simply instead of focusing on developing and installing AEB to prevent traffic accidents. Traffic accident of AEB equipped vehicle may arise a new dispute between a driver's fault and vehicle defect. It is highly recommended to regulate an advanced event data recorder system.

• Archives of Plastic Surgery
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• 제35권5호
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• pp.560-564
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• 2008

Purpose: Because of traffic accidents and many criminal violences, the incidence of facial trauma has been increasing not only in adults but also in children. We planed this study to introduce our experience about pediatric blow out fracture and provide more information. Methods: We made retrospective study in 76 children with blow out fracture from January 2001 to September 2005 by retrospective chart review including detailed preoperative and postoperative evaluations, age, sex, cause, symptom and sign, and their post-operative complications. Results: Among our patients, 69 were male and 7 were female. The ages ranged from 7 to 18 years, which shows the greatest incidence of blow out fracture. Physical violence(46%) was the most common cause in this group and was followed by vehicle accident(28%), and fall down accident(17%). Left side(64%) showed slightly more incidence than right side(36%), but there were no statistical importance. Ecchymosis(88%) was the most common symptom and followed by periorbital swelling(68%) and diplopia(30%). 30 patients was diagnosed with another facial bone fracture and nasal bone(51%) was the most common associated facial bone fracture. Fourty four Patients(60%) got an orbital wall reconstruction in 7 days after trauma. After the operation, only 3 patients(4%) suffered from diplopia postoperative 3 month, and resolved in 4 years. Conclusion: The incidence of blow out fracture in children has been increasing every year, and violence has become more important etiology of pediatric blow out fracture and public and private education institutions were the most common place that blow out fracture originated. Accurate diagnosis and careful treatment plans are important in pediatric blow out fracture.

• 한국산학기술학회논문지
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• 제11권6호
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• pp.2240-2245
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• 2010

심근영상의 SPECT(Single Photon Emission Computed tomography)검사는 감마선을 방출하는 방사성의약품을 환자에게 정맥주사한 후 이 의약품이 심장에 고루 퍼지면 관심부위를 촬영하여 질병으로 인한 변화를 컴퓨터를 이용하여 진단하는 검사법이다. 기능적인 정보를 담고 있는 심근관류 영상은 비침습적인 심근질환 검사에 유용한 방법이지만, 물리적 인자들에 의해 잡음과 낮은 해상도는 판도하는데 어려움을 주게 된다. 본 논문은 심근영상을 레벨 셋 알고리즘을 이용하여 영상을 분할하고 분할된 영역을 3차원으로 구현하여 판독에 도움을 주는 방안을 제안하였다. 판독의 어려움을 해결하기 위하여 레벨 셋을 이용하여 관심부위인 좌심실 영역을 분할하였고 분할된 영역을 3차원영상으로 모델링 하였다.