• 치과방사선
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• 제14권1호
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• pp.121-134
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• 1984

The authors analyzed the morphological change of bone structure from 3,140 radiographs (1570 joints) of 785 patients with temporomandibular joint arthrosis, which were obtained by the oblique lateral transcranial projection and orthopantomographs. The interrelation of bone change and clinical symptoms, duration of the diseases were examined. Also, the bone changes of articular eminence, condyle, articular fossa were examined according to positional change of the condyle in the mouth open and close state. The results were as follows. 1. In the 785 patients with TMJ arthrosis, 782 patients (99.62%) show the positional change of the condyle. Among them 691 patients (88.03%) show the bone change. 2. In TMJ arthrosis patients with bone changes 451 patients (65.27%) showed both the condylar positional changes and bone changes bilaterally. 198 patients (28.65%) show the condylar positional changes bilaterally and bone changes unilaterally. 3. The bone changes in the TMJ arthrosis were in order of frequency eburnation (647 cases, 32.8%), erosion (548 cases, 27.79%), flattening (418 cases, 21.20%), deformity (138 cases, 6.99%). sclerosis (115 cases, 5.83%), marginal proliferation (106 cases, 5.38%). The region of bone change in TMJ arthrosis with condylar positional changes were in order of frequency the articular eminence (43.97%) condylar head (38.64%), articular fossa (17.39%). In the patients with bone changes, their clinical symptoms were pain (44.34%), clicking sound (33.5%), limitation of mouth opening (22.52%). In the patients complaining pain the most frequent bone change was erosion (28.60%), in the patients complaining clicking sound, eburnation (28.97%) in the patients complaining the limitation, eburnation (29.40%). Also in the patients with the duration below 1 year most common bone change was eburnation. 5. The most common condylar positional change was downward position (39.94%) in closed state, restricted movement of condyle (30.07%) in open state. The condylar positional changes and bone changes according to the region were as follows: a) In the condylar head the most frequent bone change was erosion (30.45%) and the most frequent condylar positional change was downward position (37.40%) in closed state, restricted movement of condyle (33.2%) in open state. b) In the articular eminence the most frequent bone change was eburnation (39.91%) and the most frequent condylar positional change was downward position (39.79%) in closed state, restricted movement of condyle (27.22%) in open state. c) In the articular fossa the most frequent bone change was eburnation (53.94%) and the most frequent condylar positional change was downward position (42.57%) in closed state, restricted movement of condyle (30.32%) in open state.

• Journal of Oral Medicine and Pain
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• 제31권1호
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• pp.101-111
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• 2006

측두하악관절장애에 관한 역학연구는 주로 1970년대 초 스칸디나비아국가에서 국민을 대상으로 무작위 추출법에 의한 악관절 및 저작계기능에 관한 역학조사로 시작되었으며 국내에서도 1970년대 이후 측두하악관절장애의 유병률에 대해 많은 역학연구가 보고되었다. 하지만 성, 병력, 주소, 진단에 따른 각각의 증상과 징후들을 평가한 연구는 외국에 비해서 많이 부족한 실정이다. 측두하악관절장애에 대한 증상과 진단에 관한 총괄적 연구조사는 오래전에 이루어진 것이 대부분이기 때문에 본 연구를 통해서 측두하악관절장애를 가진 환자들의 성, 병력, 주소, 진단에 따른 증상들을 총괄적으로 조사하여 향후 점증하는 측두하악관절장애환자의 진단과 치료에 도움이 되는 기초자료를 확보하고자 하였다. 본 연구결과를 보면 우선 연령의 경우 전체 내원 환자 6500명의 평균나이는 34.06세로 남자는 33.15세, 여자는 34.62세였으며 진단그룹별로 연령차이가 있었다. 의뢰 환자는 대체로 치과의사가 의뢰한 환자가 많았으며(80.07%), 의뢰한 환자 진단군은 관절성장애, 근육성장애, 연조직질환 순이었다. 전체 내원 환자 중 63%가 안면통증으로 내원하였으며, 발생부위에 대한 비교에서 좌우 유의한 차이를 볼 수 없었다. 또한 통증 발생은 6개월 미만에서는 주로 남성이, 6개월 이상인 경우는 여성의 비율이 상대적으로 높음을 알 수 있었다. 관절잡음의 경우 병력 환자는 3445명(53.15%)였으며, 발병시기에는 성차가 없었다. 관절잡음의 발생부위는 좌우 양측간에 차이가 없었으며 주로 clicking sound가 많음을 알 수 있었다. 이갈이는 주로 남자에서, 이악물기는 여자에서 나타났었다.

• 제어로봇시스템학회논문지
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• 제17권11호
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• pp.1168-1172
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• 2011

Beam projector is popularly used for presentation. In order to pay attention to local area of the beam projector display, a laser pointer is used together with a pointing device(Mouse). Simple wireless presenter has limited functions of a pointing device such as "go to next slide" or "back to previous slide" in a specific application(Microsoft PowerPoint) through wireless channel; thus, there is inconvenience to do other tasks e.g., program execution, maximize/minimize window etc. provided by clicking mouse buttons. The main objective of this paper is to implement a multi-functional laser-pointer mouse that has the same functions of a computer mouse. In order to get position of laser spot in the projector display, an image processing to extract the laser spot in the camera image is required. In addition, we propose a transformation of the spot position into computer display coordinates to execute mouse functions on computer display.

• 대한치과교정학회지
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• 제22권3호
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• pp.617-626
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• 1992

This study was conducted for the assessment of the usefulness of masseteric silent period on electromyogram as a diagnostic method for temporomandibular disorder. Of students and dentists in Dental College of Yonsei University and patients, 36 experimental subjects with symptoms such as clicking bound, pain in the temporomandibular joint area and limitation of jaw movement, and 33 control subjects without such symptoms were selected for this study. On each subject electromyographic masseter muscle silent period followed by mention tap was recorded with surface electrodes and analysed with computerized system. The following results were obtained: 1. The mean silent period was $36.97{\pm}9.23$ msec in experimental group, and $25.62{\pm}5.24$ msec in control group respectively. 2. There were no statistically significant differences in silent period between male and female in either experimental and control group. 3. Silent periods in experimental group were more prolonged than those of control group. (P < 0.01) Taken all together, electromyographic masseter muscle silent period may be useful for diagnosis and evaluation of temporomandibular disorder.

• 한국환경과학회지
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• 제9권6호
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• pp.443-447
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• 2000

Chonan and Asan city have been a focal point due to rapid development as the first station for Express Railroad and key cities West Coast Development Region. Gokgyo stream adjacent to the cities plays an important role as a drainage channel for an agriculture and a discharger of urban storm water. Waster quality of the stream has been deteriorating caused by pollution sources such as a untreated wastewater discharge and runoff from the watershed. In the study, we conducted 4 surveys in April, May, July, and September to understand the current state of water quality for the stream and to make it possibe to predict future water-quality variation for future development. The system runs on a personal computer under the windows enviroment and provides extensive graphic user interface(GUI) for user-friendly assessment. Using the pull-down menus provided by the GUI panel, the user is able to operate the system by pointing and clicking the icon to identify the state of water-quality at locations concerned. Furthermore, we developed an integrated watershed management system. The constructed system could be a useful tool as a decesion maker for pollution source control strategy.

• Journal of Oral Medicine and Pain
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• 제14권1호
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• pp.25-34
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• 1989

The author performed on epidemiological study of the TMD in 189 elderly people and 195 young people with Helkimo index. The clinical dysfunction index was based on data from clinical examination and the anamestic dysfunction index was based on data from the interview with the investigated person. The results were as follows : 1. In the elderly population, 27.5% reported that they had subjectively symptom of TMD but 43.4% had sign and symptoms of TMD in clinical examination. 2. The mean values for maximal opening differed significantly between elderly and young populations, 47.22mm and 51.44mm (p<0.001) and less than a 40mm opening was observed 7.9% in elderly population, 0.5% in young population (p<0.001). 3. The mean values for lateral movement to the right and left did not differ with age, which were 8.56mm and 8.47mm in elderly population, 8.90mm and 8.81mm in young population, but the mean value for protrusion differed significantly between elderly and young populations, 6.89mm and 7.64mm (p<0.01). 4. A higher incidence of TMJ noise was recorded in the elderly and young populations than young population, especially crepitus, but a higher incidence of clicking was recorded in young population (p<0.05).

• Journal of Oral Medicine and Pain
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• 제8권1호
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• pp.69-76
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• 1983

Background variables in 203 patients with TMJ pain dysfunction showing no bony change, ranging from 11 to 76 of age, were studied by use of the modified form of self-administered questionnaires deviced by Carlsson et al intended to give a review of the patient's history. All the patients were identified in the Dept. of Oral Diagnosis and Oral Diagnosis and Oral Medicine, Seoul National University Hospital, during the period from Feb. 1983 to Nov. 1983. The questions concerning general somatic and psychic health, educational and social condition were dealt with in this article. The obtained results were as follows : 1. The main symptoms reported by 203 patients were difficulties in opening the mouth wide(74.4%), clicking of TMJ(70.9%), chewing difficulties(69.0%), and pain on movement of mandible(57.6%) 2. The most fequently reported medical symptoms or histories were stomach disease (21.2%), insominia(15.3%), ENT disease(13.8%) and skin disease (12.8%) 3. Seventy-eight percent of the patients denied having had a nervous or psychic disorders while 4% were currently under treatment for such disorders. 4. Eleven percent of 203 patients with TMJ dysfunction thought their family situation was distressing(8.4%) or very troublesome(3.4%).

• 치과방사선
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• 제17권1호
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• pp.223-232
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• 1987

The author obtained the transcranial-oblique lateral radiograms from 78 patients(26 male, 52 female) with temporomandibular dysfunction problem. And then, the author analyzed the dimensional changes of the TMJ space on centric occlusion, horizontal condylar movement and antero-posterior positional relationship of condyle to the articular eminence on 2.54㎝ mouth opening with clicking, TMJ pain and mouth opening limitation repectively, which were the symptoms of the temporomandibular joint pain dysfunction problem, and compared these data with control group. The results were as follows: 1. In centric occlusion, anterior and posterior TMJ space of experimental group was slightly lesser than those of the control group, also superior TMJ space of experimental group was significantly lesser than that of the control group. (p<0.01) 2. In 2.54㎝ mouth opening, the condylar horizontal movement and the antero-posterior positional relationship to the articular eminence were significantly lesser than those of the control group. (p<0.01) 3. Examined experimental group, the degree of condylar horizontal movement of affected ide was lesser than that of the normal side in 2.54㎝ mouth opening.

• Imaging Science in Dentistry
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• 제47권1호
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• pp.57-62
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• 2017

A 21-year-old woman presented with facial asymmetry. Crepitus and clicking of the temporomandibular joint were noted. The midline deviated 5.5 mm to the left, and secondary malocclusion was observed. Panoramic and cone-beam computed tomographic images showed an irregular and exophytic bony mass on the anteromedial surface of the right mandibular condyle. A 3-phase bone scan revealed increased tracer uptake on the affected side. The lesion was treated with excision and reshaping under the diagnosis of osteochondroma confirmed by a histopathological examination. The lesion recurred after 3 years, and the patient underwent condylectomy. Mandibular condylar osteochondroma is often resected because it causes functional and aesthetic problems, but it rarely recurs. To the best of our knowledge, only 2 cases of recurrent osteochondromas of the mandibular condyle have been reported previously. Surgical treatment of the osteochondroma should be performed considering the possibility of recurrence, and long-term follow-up is recommended.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집C
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• pp.213-218
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• 2001

VR (Virtual reality) technologies have given engineers the ability to design, test, and evaluate engineering systems in a virtual environment. The virtual plant is the highlight of the application of the VR technology to plant engineering. Plant design, maintenance, control, management, operation are integrated in the virtual plant. The VR monitoring system including the concept of the virtual plant is developed to replace a current control room that has number of gages and warning lamps in two-dimensional panels which shows the operating status of a plant. The operating status of the plant is displayed in the VR monitoring system through the realistic computer graphics. Sophisticated, realistic and prompt control becomes possible. The VR monitoring system consists of advanced visualization, walk-through simulation and navigation. In the virtual environment, a user can navigate and interact with each component of a plant. In addition, the user can access the information by just clicking interesting component. The VR monitoring system is operated with various modules, such as (1) virtual plant constructed with Graphic Management System (GMS), (2) Touch & Tell System, and (3) Equipment DB System of Part. In order to confirm the usefulness of the VR monitoring system, a pilot gas plant which is currently being used for plant operator training is taken as application. The end of the paper gives an outlook on the future work and a brief conclusion.