Tree Grammar를 이용한 한글 인식 Algorithm과 Simulation에 관한 연구

李敎鎬,鄭燦義 건국대학교 1985 論文集 Vol.20 No.1

Syntactic pattern recognition is concerned with the application of formal language and automata theory to the modeling and description of structural relationship in pattern classes. In this paper, the recognition of Korean characters is tried with the tree grammar method in various approach of syntactic pattern recognition. A microcomputer, a digisector, and a C.C. TV camera were used as instruments for simulation. The most significant factor that improved recognition-success-ratio was illumination.

엘리베이터 도어의 거동해석

이종선,손의찬 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

The objective of this study is to behavior analysis of elevator door. In general, a door system are a device for an elevator in safety. The finite element model was developed to compute stress and strain. ANSYS code was applied for this behavior analysis.

전문대학 물리치료과 교육과정 개선에 관한 연구

이재학,박찬의,오승렬 高麗大學校 倂設 保健大學 保健科學硏究所 1983 保健科學論集 Vol.13 No.1

With a view to regulating proposals for model curricula by establishing the purpose and objectives of education for the department of physical therapy in technical colleges, and to proposing educational objectives and the syllabus on major subjects, we have conducted a comparative analysis of the proposals recommended by the World Confederation for Physical Therapy, those prescribed by the Department of welfare of Japan, model proposals of the Ministry of Education of Korea, and the current curricula and syllabus of local technical colleges, and obtained following conclusions: 1. The purpose of education of physical therapy has been established, which reads "The purpose of the education of physical therapy lies in teaching and studying the special knowledge and theories on the fields of health and medical treatment, practicing the treatment skills, and thus training physical therapists needed to promote the national health" and the objectives to achieve this purpose have been established as follows: (1) To foster such personality and character as needed as a democratic citizen, and to establish firm views of professional ethics. (2) To acquire expert knowledge and treatment skills with which to cope with the requirements of the rapidly growing fields of health and medical treatment. (3) To increase the capabilities to carry out physical therapists' duties effectively as health and medical treatment experts. 2. As to the compilation of curricula, the cultural courses have been divided into required subjects (16 credits) and elective subjects (more than 3 credits) for which more than 19credits(more than 23.75% of the credits required for graduation) must be completed, while the major courses have teen divided into the elementary subjects (12 credits), required subjects (20 credits), and elective subjects .(more than 29 credits), for which more than 61 credits (76.25% of the credits required for graduation). In particular, out of the elective subjects (29 credits), at least 15 credits must be completed for clinical training subjects (See Table 6). 3. The objectives of education by subject and the syllabus on major required subjects and clinical training subjects have been presented. (See Tables 7-13) 4. As results of comparative analysis of the subjects proposed by the World Confederation for Physical Therapy and those prescribed by the Ministry of Welfare of Japan, it is advisable to rearrange them gradually as four-year courses in order to improve special knowledge and treatment skills.

방사선조사와 저칼슘식이가 성장기 백서의 치주조직에 미치는 영향에 관한 실험적 연구

이상래,황의환,전찬덕 大韓口腔顎顔面 放射線學會 1998 Imaging Science in Dentistry Vol.28 No.1

The present study was designed to elucidate the effects of the Co-60 ?? irradiation and/or calcium-deficient diet on the periodontal tissue formation in rat pups. The pregnant three-week old Sprague-Dawley rats were used for the study. The experimental group was divided into two groups, irradiation/normal diet group(Group 2) an irradiation/calcium-deficient diet group(Group 3). The control group was non-irradiation/normal diet group(Group 1). The abdomen of the rats at the 19th day of pregnancy were irradiated with single absorbed dose of 350 cGy. The rat pups were sacrificed on the 14th day after delivery, and the maxillae including molar tooth germ were taken. The specimens including the 1st molar tooth germ were prepared to make tissue sections for light and transmission electron microscopy. Some of tissue sections for light microscopy were stained immunohistochemically with anti-fibronectin and anti-osteonectin antibodies. The results were as follows; 1. In the periodontal ligament forming area, the fibroblasts of Group 2 showed irregular arrangement and low activity. The immunoreactivity between the fibroblasts and collagen fibers was decreased, compared with Group 1. The fibroblasts of Group 3 showed atrophic change and clumped nucleus. The collagen fibers showed cystic change and low immunoreactivity to the fibronectin. 2. In the cementum forming area, the cementoblasts of Group 2 showed decrease of number and atrophic change. The cementoblasts of Group 3 showed edematous change, atrophy of cytoplasm, and clumping of nucleus. 3. In the alveolar bone forming area, the bone of Group 2 was thin and various degree of immunoreactivity to the osteonectin. Group 3 showed edematous osteoblasts, fibrous degeneration of bone marrow, and weak immunoreactivity to the osteonectin.

벡터제어를 이용한 표면형 영구자석 동기전동기의 최대효율제어

이진,김의선,홍형표,최찬학 木浦大學校 工業技術硏究所 1992 工業技術硏究誌 Vol.2 No.-

In general, surface type permenent magent synchronous motor is controlled by the i_d=0 control method for producing maximum torque per ampere below the rated speed. And it is controlled by the field-weakening control method in order to expand the operating speed limits. However, these control methods do not consider the efficiency. So it is required to minimize the loss. This paper proposes a maximum efficiency control algorithm for surface type permanent magnet synchronous motors. The proposed maximum efficiency algorithm is derived from minimizing the core loss and copper loss. In this method the optimum d-axis current is supplied by the vector controller which solves the maximum efficiency control algorithm. From the computer simulation and experimental results. the improvement of the efficiency with the proposed control system was confirmed.

키토산 구슬을 이용한 가토 연골세포의배양

장의찬,김경환,저호중,이기현,정상인,손태일 대한정형외과연구학회 2003 대한정형외과연구학회지 Vol.6 No.2

유산 완충용액의 pH 및 포화도 변화에 따른 법랑질 내 수산화인회석 결정 형태의 변화

전영의,정일영,노병덕,이찬영 大韓齒科保存學會 2007 Restorative Dentistry & Endodontics Vol.32 No.6

Since it was reported that incipient enamel caries can be recovered, previous studies have quantitatively evaluated that enamel artificial caries have been remineralized with fluoride, showing simultaneously the increase of width of surface layer and the decrease of width of the body of legion. There is, however, little report which showed that remineralization could occur without fluoride. In addition, the observations on the change of hydroxyapatite crystals also have been scarcely seen. In this study, enamel caries in intact premolars or molars was induced by using lactic acidulated buffering solutions over 2 days. Then decalcified specimens were remineralized by seven groups of solutions using different degree of saturation (0.212, 0.239, 0.301, 0.355) and different pH (5.0, 5.5, 6.0) over 10 days. A qualitative comparison to changes of hydroxyapatite crystals after fracturing teeth was made under SEM (scanning electron microscopy) and AFM (atomic force microscopy). The results were as follows : 1. The size of hydroxyapatite crystals in demineralized area was smaller than the normal ones. While the space among crystals was expanded, it was observed that crystals are arranged irregularly. 2. In remineralized enamel area, the enlarged crystals with various shape were observed when the crystals were fused and new small crystals in intercrystalline spaces were deposited. 3. Group 3 and 4 with higher degree of saturation at same pH showed the formation of large clusters by aggregation of small crystals from the surface layer to the lesion body than group 1 and 2 with relatively low degree of saturation at same pH did. Especially group 4 showed complete remineralization to the body of lesions. Group 5 and 6 with lower pH at similar degree of saturation showed remineralization to the body of lesions while group 7 didn't show it. Unlike in Group 3 and 4, Group 5 and 6 showed that each particle was densely distributed with clear appearance rather than crystals form clusters together. 법랑질 초기 우식이 회복된다는 것이 보고된 이래 법랑질에 대하여 불소를 첨가한 상태에서 행했던 이전의 연구들은 법랑질 인공우식의 재광화가 표면층의 증가와 함께 병소본체의 폭 감소가 일어난다는 정량적인 평가는 많이 하였으나 불소를 첨가하지 않은 상태에서는 재광화가 일어났다는 연구는 부족하였고, 또 수산화인회석 결정의 입자 변화에 대한 관찰도 미비하였다. 본 연구는 탈회나 균열이 없는 소구치 및 대구치를 대상으로 탈회 완충용액을 이용하여 법랑질을 2일간 탈회시키고, pH와 포화도가 상이한 7가지 유산 완충용액으로 10일 동안 재광화를 유도한 후 치아를 파절시켜 수산회인회석 결정의 변화를 원자현미경과 주사전자현미경을 이용하여 정상적으로 비교 관찰하여 다음과 같은 결과를 얻었다. 1. 탈회된 부위에서 관찰된 수산화인회석 결정은 정상적인 수산화인회석 결정보다 크기가 작았으며 결정 사이의 공간이 증가하면서 결정들이 불규칙하게 존재하는 것이 관찰되었다. 2. 재광화된 부위에서는 탈회에 의하여 형성된 빈 공간에 작은 수산화인회석 결정이 새로 침착되는 양상과 결정들이 융합하여 다양한 모습을 갖는 더 커진 결정들을 관찰할 수 있었다. 3. 동일한 pH에서 포화도가 더 높은 3군, 4군은 1군, 2군에 비하여 표면층에서부터 병소본체까지 작은 결정들이 모여 큰 cluster를 형성하였으며 특히 4군에서는 병소본체까지 완전한 재광화가 일어났다. 비슷한 포화도에서는 pH가 더 낮은 5군, 6군은 7군에 비하여 병소본체까지 재광화가 일어났으며 3군, 4군처럼 결정들이 모여 cluster를 형성하기보다는 개개의 입자들이 뚜렷한 외형을 가지며 매우 치밀하게 분포되어 있었다.

이산화질소의 연직분포 특성에 관한 연구

전의찬,이성기 조선대학교 환경연구소 1991 環境公害硏究 Vol.8 No.-

Recently, a number of high-rise buildings have been constructed in big cities such as Seoul. The air pollution levels at these buildings are expected to be generally different from those at the ground level. The purpose of this study is to show the vertical distribution of nitrogen dioxide(NO_(2)) in Seoul City. The concentration of NO_(2) with height were measured at the Korea Exhibition(KOEX) building(54 stories), one of the new high storied buildings. At the same time, the vertical variation of the temperature were measured and the effect of the atmospheric stability on the vertical distribution of air pollutants was analyzed. The result are as follows; 1) In the morning. the minimum concentration was found at 50m above the ground, and the maximum value at the ground level and 110m above the ground. In the afternoon, the minimum value was found at 110m above the ground, and the maximum value at 50m above the ground. At night, the minimum value was found at 50m above the ground, and the maximum value at 160m above the ground. 2) The minimum value of daily average concentration was found at 50m above the ground, and the maximum value at the ground level and 160m above the ground. 3) The daily variation of air pollution concentration turned out to have a close relationship with the atmospheric stability. The NO_(2) concentration was higher in the morning exceeding the long-term air quality standard.

울산지역 초, 중, 고등학생들의 자기 체형에 대한 인식 및 불만족도에 대한 조사

홍찬의,홍성완,정철주,이동진,최광해 영남대학교 의과대학 2008 Yeungnam University Journal of Medicine Vol.25 No.2

Background : In this study, we examined body image perception and dissatisfaction with weight and height in children and adolescents, according to age and body mass index. Additionally, we compared our findings with those of previous studies concerning eating disorders. Materials and Methods : In July and August 2008, 1,501 students were sampled from elementary, middle, and high schools in Ulsan and assessed using self-completion questionnaires. We used the Korean version of the Eating Attitude Test-26 (EAT-26) to screen for eating risk groups Participants were stratified by grade, gender, and body mass index. Results : 1) Dissatisfaction with height, weight, and body image was greater in the older group. 2) Dissatisfaction with weight and body image was greater in the heavier group. 3) EAT-26 scores and the number of individuals at high risk for eating disorders were higher in the female group than in the male group. Conclusion : The EAT-26 score in this study was similar to those found in Previous Westem studies. 2) There were a number of high-risk individuals in the female group, with a tendency toward earlier Presentation. Continuous health management and prevention programs are required.

비구개관낭종에 관한 X선학적 연구

전찬덕,이상래,황의환 大韓口腔顎顔面 放射線學會 1993 Imaging Science in Dentistry Vol.23 No.1

The purpose of this study was to evaluate the clinical and radiographic features of 35 cases of nasopalatine duct cyst by means of the analysis of periapical and/or occlusal radiograms in 35 persons visited the Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyung Hee University and Chonbuk National University. The obtained results were as follows: 1. The incidence of nasopalatine duct cysts was higher in males(74.3%) than in females(25.7%). 2. The nasopalatine duct cysts were the most frequently occurred in the 4th decades(34.3%). The 6th and 7th decades(17.1%, 17.1%) were next in order to frequency followed by the 5th decades(14.3%), the 3rd decades(8.6%), the 2nd decades(5.7%), and 8th decades(2.9%). 3. In the signs and symptoms of nasoplatine duct cysts, 25.7% were swelling, 17.1% were swelling and tenderness, 20.0% were swelling and pain, and 37.2% were a symptom. 4. In the shape of nasopalatine duct cysts, 40.0% were round type, 48.6% were oval type, and 11.8% were heart type, In symmetry of the nasopalatine duct cysts to the median palatine surture, 85.7% were symmetry, 14.3% were asymmetry. 5. In the width of nasopalatine duct cysts, 11.4% were 6-10mm, 48.6% were 11-20mm, 25.7% were 21-30mm, and 14.3% were 31-40mm. 6. In the periphery of nasopalatine duct cysts., 82.9% were distinct, 17.1% were relatively distinct. 7. In the change of root, 51.5% were intact, 17.1% were root divergence, 20.0% were root resorption, and 11.4% were root divergence and resorption.