• Maxillofacial Plastic and Reconstructive Surgery
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• 제27권6호
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• pp.545-551
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• 2005

Purpose: The effect of orthognathic surgery on the temporomandibular dysfunction has been controversial. The purpose of this study is to prove statistically that early removal of fixation plate at postoperative 2 weeks with active exercise of mouth opening could relieve preoperative temporomandibular dysfunction and reposition of temporomandibular joint. Patients and Methods: All 28 subject patients underwent mandibular setback with BSSRO in Kyunghee medical center by one surgeon. The fixation plates used for rigid fixation were removed at postoperative 2 weeks and we had the patients excercise active mouth opening with intermaxillary rubber rings for the guiding proper postoperative occlusion. Temporomandibular symptoms were checked and radiographs were taken before surgery, within a month after surgery, six to twelve months after surgery respectively. Results: The temporomandibular dysfunction symptoms were relieved after the surgery and the condyle was displaced inferior-posteriorly immediate after surgery and repositioned toward its original position during follow-up periods. Conculusion: Orthognathic surgery may benefit temporomandibular joint dysfunction by obtaining a postoperative stable occlusion and more physiologic neuromuscular function. The early removal of fixation plates after BSSRO could reposition the temporomandibular joint to physiologic position and relieve the symptoms of temporomandibular dysfunction by permitting movement of proximal segment.

• 한국광학회지
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• 제10권3호
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• pp.248-253
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• 1999

본 논문에서는 측면이 연마된 단일모드 광섬유와 폴리머 다중 평면도파로가 결합했을 때 발생하는 모드 결합현상을 이용한 능동형 광결합기를 연구하였다. 제안된 소자는 파장가변 광필터나 광변조기로 이용할 수 있을 뿐만 아니라, 광도파로 물질의 굴절률, 복굴절, 전기광학 계수, 열광학 계수 등을 측정하는 도구로 응용할 수 있다. BPM으로 최적화된 결합기를 설계하였고, 열광학 폴리머를 능동 평면 도파로층으로 이용하여 결합기를 제작하였다. 제작된 소자는 -0.5dB 이하 손실, 공진파장 -13dB 소멸비. 그리고 열광학 효과에 의해 -1.5nm/$^{\circ}C$ 정도의 파장 가변성을 보였다. 본 연구의 결과로 볼 때 열광학 능동형 광결합기는 광변조기, 파장가변 광필터, 광센서 등으로 이용될 가능성이 높다.

• 한국의학물리학회지:의학물리
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• 제32권3호
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• pp.59-69
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• 2021

Purpose: The relationship between computed tomography (CT) number and electron density (ED) has been investigated in previous studies. However, the role of these measures for guiding cancer treatment remains unclear. Methods: The CT number was plotted against ED for different imaging protocols. The CT number was imported into ED tables for the Pinnacle treatment planning system (TPS) and was used to determine the effect on dose calculations. Conversion tables for radiation dose calculations were generated and subsequently monitored using a dosimeter to determine the effect of different CT scanning protocols and treatment sites. These tables were used to retrospectively recalculate the radiation therapy plans for 41 patients after an incorrect scanning protocol was inadvertently used. The gamma index was further used to assess the dose distribution, percentage dose difference (DD), and distance-to-agreement (DTA). Results: For densities <1.1 g/cm³, the standard deviation of the CT number was ±0.6% and the greatest variation was noted for brain protocol conditions. For densities >1.1 g/cm³, the standard deviation of the CT number was ±21.2% and the greatest variation occurred for the tube voltage and head and neck (H&N) protocol conditions. These findings suggest that the factors most affecting the CT number are the tube voltage and treatment site (brain and H&N). Gamma index analyses for the 41 retrospective clinical cases, as well as brain metastases and H&N tumors, showed gamma passing rates >90% and <90% for the passing criterion of 2%/2 and 1%/1 mm, respectively. Conclusions: The CT protocol should be carefully decided for TPS. The correct protocol should be used for the corresponding TPS based on the treatment site because this especially affects the dose distribution for brain metastases and H&N tumor recognition. Such steps could help reduce systematic errors.

• 디지털융복합연구
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• 제20권5호
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• pp.99-105
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• 2022

중국에서는 위챗페이, 알리페이 등 제3자 결제가 활발해지면서 은행의 전통적인 비지니스가 큰 충격을 받고 있다. 은행은 가맹점에 QR코드 결제를 권장할 수 있고 확대할 수 있다. 따라서 은행의 QR코드 업무를 분석하고 연구하는 것은 의미가 있다. 본 연구는 결제 사이클과 FTP(Funds Transfer Pricing)를 조합한 통합결제 QR코드의 제로 수수료율의 실행이 중국 상업은행에 미치는 영향을 분석하는 것을 목적으로 한다. 본 연구는 수작업으로 수집한 중국 상업은행의 고객 데이터를 기초로, 재무 지표 산출 방법을 활용하여 사례 분석을 진행하였다. 연구결과, 상업은행은 통합결제 QR코드 제로 수수료율 정책의 도입은 이점이 단점보다 더 큰 것으로 나타나 해당 정책을 지속적으로 시행할 필요가 있다는 것이 밝혀졌다. 본 연구는 상업은행의 마케팅 의사결정에 중요한 역할을 하는 오프라인 결제 시장을 빠르게 점유할 수 있는 방법에 대해 실현 가능한 제안을 제공하였다.

• 한국간담췌외과학회지
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• 제27권4호
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• pp.394-402
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• 2023

Backgrounds/Aims: Acute pancreatitis is an emergency presentation, which can range from mild to life threatening. Intravenous fluids are the cornerstone of management. Although the WATERFALL trial described the optimal fluid rate in mild/moderate pancreatitis, this trial excluded patients with moderate-severe/severe pancreatitis. The aim of this study was to establish clinical practice regarding intravenous fluid administration in acute pancreatitis and assess its effect on mortality. Methods: Prospective multi-centre audit of patients with acute pancreatitis was conducted. Data were collected regarding intravenous fluid administration within 72 hours of admission. The primary outcome was 30-day mortality. Multivariable logistic regression was used to identify predictors of 30-day mortality. Results: Those with severe pancreatitis received more fluid; median 5.7 L versus 4 L in 72 hours (p = 0.003). Participants with severe pancreatitis who died within 30 days received a median of 2,750 mL in the first 24 hours, compared to 4,000 mL in those who survived. The following factors were significant predictors of 30-day mortality: age, Glasgow score, C-reactive protein, ischaemic heart disease, and pancreatitis aetiology. Overall, volume of intravenous fluid was not associated with mortality. However, the effect of intravenous fluid volume on mortality differed significantly depending on pancreatitis severity. In severe pancreatitis, increased volume of intravenous fluid was associated with significant reductions in mortality (odds ratio = 0.655; 0.459-0.936; p = 0.020). Conclusions: In severe pancreatitis, more aggressive fluid prescription was associated with decreased mortality; however, this was not the case in milder disease. Further prospective trials guiding fluid resuscitation in severe pancreatitis are needed, as the impact of fluid on this population appears to differ from that in those with milder disease.

• Geomechanics and Engineering
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• 제23권2호
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• pp.127-137
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• 2020

To study the reverse fault formation process and the stress evolution feature, a simulation test system of reverse fault formation is developed based on the analysis of reverse fault formation mechanism. The system mainly consists of simulation laboratory module, operation console and horizontal loading control system, and data monitoring system. It can represent the fault formation process, induce fault crack initiation and simulate faults of different throws. Simulation tests on reverse fault formation process are conducted by using the simulation test system: horizontal loading is added to one side of the model. the bottom rock layer cracks under the effect of the induction device. The crack dip angle is about 29°. A reverse fault is formed with the expansion of the crack dip angle towards the upper right along the fracture surface and the slippage of the hanging wall over the foot wall. Its formation process unfolds five stages: compressive deformation of rock, local crack initiation, reverse fault penetration, slippage of the hanging wall over the foot wall and compaction of fault plane. There is residual structural stress inside rock after fault formation. The study methods and results have guiding and referential significance for further study on reverse fault formation mechanism and rock stress evolution.

• 정보교육학회논문지
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• 제9권2호
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• pp.221-228
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• 2005

다양한 영상매체의 홍수 속에서 주체적인 사고와 올바른 가치 판단력을 기르기 위한 미술 감상 교육의 중요성이 어느 때 보다 강조되고 있고, 미술과 제7차 교육과정에서도 감상 영역과 연계하여 미적 체험, 표현 영역을 지도하도록 강조하고 있으나, 교육현장에서는 여전히 표현과 기능 위주의 미술 교육만이 실시되고 있다. 표현 활동을 마친 후 실시하고 있는 감상활동도 시간의 부족, 작품 분석에 대한 어려움, 감상지도의 어려움으로 단순히 직관에 의한 느낌을 간단히 서술하는데 그치고 있다. 따라서, 본 논문에서는 미술 작품의 조형요소를 분석하고, 응용 프로그램을 이용해 조형요소별로 작품을 수정해 보고 이를 비교 분석하여 분석감상능력을 신장시킬 수 있는 웹 기반 미술감상 시스템을 개발하였다. 이를 교육현장에 적용하여 작품에서 보여지는 가시적인 조형요소인 선 형 명암 색채 질감 공간 구도를 분석함으로써 학생들의 조형감각과 분석감상능력이 신장됨을 확인할 수 있었다.

• 영재교육연구
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• 제13권2호
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• pp.113-130
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• 2003

본 연구에서는 탐구 과정기술과 사고력을 중시하는 초등학교 과학과목의 특성을 고려하여 개발된 원격교육모형에 적용할 수 있는 학습 자료를 개발하고, 원격교수학습의 보고서를 통해 나타난 학생들의 특성을 조사하였다. 학생들은 보고서 작성을 위해 다양한 실험 방법들을 고안하는 과정에서 관찰 태도나 과학적 사고력을 신장시키는 계기를 가졌다. 이 같은 결과는 원격교육의 수업 모형이 학생들 간의 상호 작용과 그것을 종합화 할 수 있는 보고서 및 평가 등의 구성 요소들로 이루어졌기 때문에 가능할 수 있었다. 그러나 원격교육에서는 교사들이 학생들을 직접 관리 또는 감독하지 못하기 때문에 학생들의 특성을 바람직한 방향으로 유도하기가 곤란한 점도 없지 않아 있다는 것을 인정하여야 한다. 예를 들어, 보고서 작성의 형식에 대해 개별적인 평가를 해 주어도 학생들은 자신들이 가지고 있는 생각의 틀을 고수하는 점을 볼 수 있었다.

• 한국정보통신학회논문지
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• 제15권7호
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• pp.1405-1414
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• 2011

이 논문은 통신서비스의 규제정책이 역무통합이라는 규제정책의 변화와 함께 과거의 수직적 규제에서 수평적 규제체제로 바뀜에 따라 기존의 개별규제체제가 어떠한 형태로 변할 것이며, 이에 따라 통신망 투자에 어떠한 영향을 미칠 것인가를 분석한다. 역무통합은 진입규제와 행위규제를 분리하여 진입의 제약을 축소하고 행위규제의 유연성을 제고하는 효과를 가진다고 볼 수 있다. 따라서 역무통합 자체가 주는 직접적 효과보다는 상호접속 규제, 설비제공제도, 요금규제, 결합판매, VoIP 번호 이용 등 역무통합과 연계된 행위규제 개선을 통해 간접적으로 시장 파급효과가 나타날 것으로 예상된다. 본 논문에서는 먼저 기업수준에서 투자의사결정에 영향을 미치는 요소들에 대해 논의하고, 진입규제 완화, 상호접속, 요금규제, 망중립성 등의 개별규제가 투자결정에 미치는 영향경로를 분석한다. 마지막으로 정책에 대한 기본적인 가이드라인을 제안한다.

• 한국학교보건학회지
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• 제11권1호
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• pp.99-110
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• 1998

The purpose of this study is to investigate the effect of obese school children's life style habits in order to help school nurse in controlling and preventing the obesity by health education The survey group is extracted from the students of two elementary schools located in Seongnam city Out of 280 children randomly sampled, 102 children were evaluated to be obese and 178 ones to be normal by the standard of the 1985 Korea Pediatric Association Height and Weight Standard Chart The obese children group was compared with the normal one. For this purpose, the surveyors designed a self questionnaire to obtain the description of general background, exercise including play behavior, eating behavior, and family environment of the sampled children. The results are as follows The number of the obese children who took extracurricular physical exercises was significantly (p<0.05) more than that of the normal ones The significantly (p<0.05) more obese children went without a meal to control their weight than the normal ones. In relation to the degree of obesity, the children with the high degree of obesity watched the television significantly (p<0.05) longer than the ones with the mild and the moderate degree of obesity In gender relations, the obese girls participate in outdoorplays and physical exercises significantly (p<0.05) longer and more regularly than the normal ones, while no significant difference was found between the male groups The obese boys had significantly (p<0.05) their mothers occupying in a vocation. Combining television watching habit and mother's vocation of the obese boy, the obesity is resulted from complicated situation It can not be due to the simple absence of the mother, but rather due to the absence of a person responsible for controlling snacking and television watching time of the child Looking at the results, it is necessary for both school and home to actively involve in guiding children and providing an environment to modify life style habits and prevent childhood obesity.