• 한국실내디자인학회논문집
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• 제25권2호
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• pp.30-40
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• 2016

This study analyzed the attention concentration tendencies of one(1) subject who showed convergent exploratory acts actively through the gaze-brainwave measurement experiment of cafe space images and our research findings are as follows. First, the areas of interest (AOIs) that the subject gazed visually by paying attention to it and concentrating on it at a cafe space include counter&menu area, sign area, partition area, image wall area, stairs area, and movable furniture area, and built-in furniture area: seven areas in total. Second, conscious gaze frequency appeared the highest in counter&menu area, and conscious gaze appeared more later than in initial times. Third, conscious gaze pattern was divided into the zone that explored various areas dispersely (distributed exploratory zone) and the zone that explored between particular areas concentratedly (intensive exploratory zone). Fourth, as a result of analyzing the brainwave attention concentration, it was found that the attention concentration in prefrontal lobe (Fp1, Fp2) and frontal lobe (F3, F4) rose to a higher level in the zone of 15 to 16 seconds and this time zone was considered to be a zone where gazing at counter&menu area was very active. In addition, the attention concentration appeared higher in the initial zone than in the later zone, among the entire experimental time zones. Finally, as a result of analyzing the changes in activation by brain portion of the SMR wave expressed when maintaining the arousal and attention concentration, it was found that the right prefrontal lobe and the frontal lobe became activated in the time zone when the intensive exploration of "counter&menu area" and "movable furniture${\leftrightarrow}$built-in furniture area" had occurred and the time zone when the intensive exploration of "image wall${\leftrightarrow}$partition area" and "counter&menu${\leftrightarrow}$sign area" had occurred.

• Archives of Plastic Surgery
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• 제36권5호
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• pp.623-628
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• 2009

Purpose: In cases where nasal fractures involve frontal process of maxilla or perpendicular plate of ethmoid, 4 - 5 days of nasal packing may not provide sufficient support for avoiding displacement after packing removal. Therefore a single Kirschner - wire(K - wire) is used as an internal splint when nasal fractures involve the above two areas. Methods: Thirty five patients during the last 3 practical years were treated with a K -wire pinning according to the anatomic locations of nasal fractures. We performed a retrospective study using 13 nasal fractures out of total 35 patients. Among 13 cases, 10 patients involved frontal process of maxilla, and 3 patients were diagnosed as bilateral nasal side wall fractures accompanied with fractures of perpendicular plate of ethmoid. One patient of the last three cases had been augmented with dorsal silicone implant long before the trauma. We analyzed the anteroposterior displacement of key stone area and the width between both lateral walls by comparing immediate postoperative radiographs with 2 month follow - ups. To reduce the errors, the same measurements were taken by two different inspectors, and the mean of each inspector's measurements was compared. Patient satisfaction was analyzed using a questionnaire regarding the esthetic and functional outcomes. Results: Ten patients underwent a longitudinal K - wire fixation in submucoperiosteal plane underneath the frontal process of maxilla. And three patients underwent a transverse K - wire fixation from the one side of lateral wall to the perpendicular plate of ethmoid and to the other side of lateral wall. The mean postoperative anteroposterior displacement of the key stone area measured by two inspectors were 1.84% and 3.06%; mean narrowing of bony pyramid were 1.33% and 1.48%, respectively. Subjective satisfaction scores regarding the esthetic appearance and the maintenance of nasal shape compared with immediate post - operative state with the long term ones were not different (p>0.05). Conclusion: K - wire pinning after closed reduction is a reliable and useful method for the treatment of nasal fractures involving frontal process of maxilla or perpendicular plate of ethmoid. This is because it achieves longer intranasal support after reduction. This method also leaves conspicuous external scar, and minimal soft - tissue injury.

• 멤브레인
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• 제13권1호
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• pp.20-28
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• 2003

본 연구에서는, 혈관 내 폐 보조장치를 설계할 때 혈액의 압력손실에 대한 영향을 받지 않는 최적의 설계조건을 찾기 위하여 압력손실을 예측할 수 있는 관계식을 유도하고자 하였다. 정맥 내경의 직경을 3 cm로 고정하고 삽입되는 중공사 개수의 변화에 따른 압력손실을 측정하였으며 실험에 의하여 얻어진 압력손실과 장치의 전면면적과의 상관관계를 curve fitting을 통하여 유도하였고, 유도되어진 관계식을 이용하여 정맥 내에 삽입되는 중공사 개수의 변화에 따른 압력손실을 예측하였다. 그리고 실험을 통하여 예측되어진 값과 비교 검토하여 유사성을 찾고자 하였다. 실험결과 장치에서 액체 유속의 변화에 따라 압력손실은 2차 함수 형태로 변화됨을 알 수 있었다. 또한 장치의 전면면적이 감소하면 압력손실은 증가하였고 충진율이 증가하면 압력손실도 증가함을 알 수 있었다. 장치 내에서의 압력손실에 대한 관계식을 장치의 전면면적과 충진율의 함수로 유도할 수 있었으며, 관계식에 의하여 압력손실을 예측할 수 있었다. 또한, 실험에 의한 압력손실과 비교하였을 때 유사한 경향성을 보여 줌으로써 압력손실 예측의 신뢰성을 얻을 수 있었다.

• 대한두경부종양학회지
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• 제26권2호
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• pp.243-246
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• 2010

Purpose : Eosinophilic granuloma is a rare benign tumor that is characterized histologically by the presence of destructive granulomas containing numerous Langerhans, cells. The most common presentation of eosinophilic granuloma is a painful, immobile scalp mass in the frontal and parietal bones occurring predominantly in children and adolescents or young adults. We report a representative case of eosinophilic granuloma. Methods : A 16-year-old woman complained of an enlarging fixed scalp mass without pain and tenderness which measured $3{\times}4.5cm$ at the frontal area, which had been found incidentally 2 months before. Plain skull x-ray showed a punched-out bone lesion. Computed tomography and magnetic resonance imaging showed a non-enhancing osteolytic lesion. The tumor and surrounding bony edges were completely removed via a bicoronal approach. The bony defect was reconstructed with bone cement. Results : The tumor was involved frontal bone and dura mater. We confirmed the tumor by the documentation of Birbeck's granules by electron microscopy. There is no evidence of local recurrence during postoperative 1.5 years. Conclusion : The present case shows the characteristic feature of frontal bone involvment of the eosinophilic granuloma. The prognosis of eosinophilic granuloma depend on age at diagnosis and number of bones involved. We consider that best choice of treatment for eosinophilic granuloma is surgical excision.

• 자동차안전학회지
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• 제15권4호
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• pp.88-94
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• 2023

The seating postures of passengers in the automated driving vehicle are possible in atypical forms such as rear-facing and lying down. It is necessary to improve devices such as airbags and seat belts to protect occupants from injury in accidents of the automated driving vehicle, and collision safety evaluation tests must be newly developed. The purpose of this study is to define representative types of head-on collision accidents to develop collision standards for autonomous vehicles that take into account changes in driving behavior and occupants' postures. 150 frontal collision cases remained by filtering (accident videos, images, AIS 2+, passenger car, etc…) and random sampling from approximately 320,000 accidents claimed by a major insurance company over the past 5 years. The most frequent accident type is a head-on collision between a vehicle going straight and a vehicle turning left from the opposite side, accounting for 54.7% of all accidents, and most of these accidents occur in permissive left turns. The next most common frontal collision is the center-lane violation by drowsy driving and careless driving, accounting for 21.3% of the total. For the two types above, data such as vehicle speed, contact point/area, and PDOF at the moment of impact are obtained through accident reconstruction using PC-Crash. As a result, two types of autonomous vehicle crash safety test scenarios are proposed: (1) a frontal oblique collision test based on the accident types between a straight vehicle and a left-turning vehicle, and (2) a small overlap collision test based on the head-on accidents of center-lane violation.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제22권1호
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• pp.56-62
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• 2000

Fracture of frontal bone is infrequent, but may have serious complications because of their proximity to the brain, eyes and noses. Fractures of the frontal area range from 5% to 15% of all facial bone fracture and include supraorbital rim and frontal sinus. As frontal bone fractures most frequently occur in the multiply injured patient, a thorough clinical and radiological examination of the patient is required before diagnosis and treatment plans are established. Sometimes coorperative treatment with other department is required. It is specially considered that incision for access to frontal region and surgical methods for open reduction, cranialization, cannulization, sinus obliteration. After surgical or conservative treatment, it may have complication. Complication of frontal bone injury vary in severity and may occur at several years after the incidents. The major types of complications are those that occur directly at the time of injury, infection and chronic problems. This is clinical study on 31 patients with frontal bone fracture, at department of oral and maxillofacial surgery in dental hospital of Wonkwang university during past ten years. The results were as follows; 1. The sex ratio of all patients is 29 (94%) male to 2 (6%) female, the average age is 33 and the prominent groups are 2nd, 3rd decade age. 2. The causative factors are mostly traffic accident 22 cases (70%) and fall dawn, industrial accidents, so on. 3. The 17 cases has shown alert mental status, but neurologic problems is in 14 (45%) cases in initial accessment. 4. Associated facial bone fractures are prominent in the maxilla (42%) and panfacial fracture (39%). 5. Involved general problems are in department of neurologic surgery problems (65%), orthopaedic problems (23%) and ophthalmologic problems (19%) in order. 6. Open reduction has done in 15 cases and 16 cases with conservative management. 7. Postoperative complications are chronic headache (42%), esthetic problems (39%) and ophthalmologic problems (35%)in order.

• 한국해안해양공학회지
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• 제2권1호
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• pp.34-42
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• 1990

우리나라 서해안 새만금해역의 조석을 수량적분한 수치모형에 의해 조사하였다. 첫 단계로서 4개 주요분석(M$_2$, S$_2$, $K_1$, $O_1$)의 외해경계외력을 부여함으로써 독립적인 조석체계를 산정하였다. 수립된 모형은 이 해역에 방조제가 건설될 시 주요분조의 변화양상을 1차적으로 평가하는데 적용된 바 반일구조의 진폭은 방조제 전면에서 2-7cm확폭되나 일주조는 큰 변화가 없었다. 반면에 방조제에 의한 주류체계는 큰 변화를 제시하는데 방조제 전면부의 유속감소와 최대해저마찰응력의 변화를 볼 때 전면부의 토사이몰 가능성이 높은 것으로 추정된다.

• 환경생물
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• 제38권3호
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• pp.461-475
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• 2020

여수와 제주도 사이 해역에 출현한 수표성 동물플랑크톤의 군집 분포와 환경요인 간의 관계를 파악하기 위해 2017년 9월 총 14개 정점에서 뉴스톤 네트를 이용하여 선박 측면에서 예인 및 채집하였다. 동물플랑크톤은 총 81개 분류군으로 요각류가 최우점하였다. 동물플랑크톤 출현 개체수를 기반으로 연안수의 영향을 받는 해역, 연안수와 외해수가 만나는 해역, 외해수의 직접적 영향을 받는 해역으로 구분되었다. 본 연구에서 해역별 우점 요각류, 식성에 따른 요각류를 2개 그룹으로 구분하고 군집에 미치는 환경요인을 분석한 결과 수온과 염분, 식물플랑크톤, 부유플라스틱과 유의미하였다(p<0.05). 추가로 연구 해역에 출현한 치어 및 화살벌레류의 위 내용물 분석을 통해 미세플라스틱 섭식을 확인하였다. 낮은 영양단계에서 섭취한 플라스틱이 먹이사슬을 타고 올라가 높은 영양단계로 전달된 것으로 보인다. 결과적으로 우리나라 남해 서부 해역에 출현하는 동물플랑크톤 군집 특성을 볼 때 여름철 확장 범위를 달리하는 섬진강 수, 제주난류, 쓰시마난류의 영향을 받아 군집 분포가 달라지는 것으로 판단된다.

• 한국정밀공학회지
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• 제17권4호
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• pp.226-232
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• 2000

This paper develops a finite element model for studying the crashworthiness analysis of a mid-size truck. A simulation for a truck frontal crash to a rigid barrier using the model is performed with PAM-CRASH installed in super computer SP2. Full vehicle model is composed of 86467 shell elements, 165 beam elements and 98 bar elements, and 86769 nodes. The model uses four material model such as elastic, elastic-plastic(steel), rigid and elastic-plastic(rubber) material model which are in PAM-CRASH. Frame and suspension system are modeled with 28774 shell elements and 31412 nodes. Cab is modeled with 34680 shell elements and 57 beam elements, and 36254 nodes. Bumper is modeled with 2262 shell elements, and 2508 nodes. Axle, steering shaft, etc are modeled using beam or bar elements. Mounting parts are modeled using rigid bodies. Bodies are interconnected using nodal constrains or joint options. To verify the developed model, frontal crash test with 30mph velocity to a rigid barrier is carried out. In the crash test, vehicle pulse at lower part of b-pillar is measured, and deformed shapes of frame and driver seat area are photographed. Those measured vehicle pulse and photographed pictures are compared those from the simulation to verify the developed finite element model.

• 대한두개안면성형외과학회지
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• 제15권3호
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• pp.125-128
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• 2014

Malignant peripheral nerve sheath tumors are extremely rare soft tissue sarcomas. Among various locations, the trunk and extremities are the most commonly involved sites, with only 15% of such lesions occuring in head and neck region. Here, we report a case of a 74-year-old male who presented with forehead swelling and right eye deviation. Computed tomography images revealed a tumor involving the frontal sinus, ethmoid sinus, and the orbital cavity. The patient underwent a surgical excision of the lesion, which histopathological examination revealed to be a malignant peripheral nerve sheath tumor.