• The korean journal of orthodontics
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• v.27 no.4 s.63
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• pp.523-538
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• 1997

In order to investigate TMD prevalence in malocclusion patients and to study its relationship with occlusal factors, 205 malocclusion patients (M67, F138, 6Y1M-46Y8M) were examined. The following examinations were carried out, Questionnaire personal history, TMD symptoms, and the associated factors Clinical examination : TMJ sound and maximum mouth opening Orthopantomogram : condyle abnormalities, length of Co'-Inc' and Co'-Go', ratio Co'- Inc'/ Co'-Go', and depth of antegonial notch Transcranial view limitation of anterior movement of condyle Model Angle classification, overjet, overbite, midline discrepancy, missing of posterior teeth, posterior crossbite, attrition of palatal cusp of maxillary molars, crowding/spacing The results could be summarized as follows, 1. The prevalence of TMD showed that Helkimo Anamestic Inder(Ai) 0 was $46.8\%$, Ai I was $22.0\%$, Ai II was $31.2\%$ and subjective symptoms increased with aging (p<0.001) and were frequent in females (p<0.05). 2. Flattening ($4.4\%$) was the most frequent condyle abnormality on Orthopantomogram, and $8.3\%$ of subjects showed some abnormalities on Orthopantomogram. 3. The cases with neck and shoulder pain (p<0.001), clenching, lip biting (p<0.01), and headache (p<0.05) showed higher scores of Ai. 4. Angle class II showed high frequency of condylar abnormalities on Orthopantomogram, and subjects whose palatal cusp of maxillary molars had been attrided had the tendency to show high hi scores (p<0.05). The other occlusal factors had nothing to do with the symptoms of TMD. 5. In the cases that 1)the value of Co'-Inc', Co'-Go' or Co'-Inc'/Co'-Go' were low or 2)the differences of Co'-Go' or Co'-Inc'/Co'-Go' between the right and the left were large, condylar abnormalities were frequently obserbed on Orthopantomogram.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1981.05a
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• pp.39.1-39
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• 1981

The author presents clinical study for 111 cases of tinnitus with pure tone audiometry from Jan. 1, 1978 to Dec. 31, 1980 in department of otolaryngology, Ewha Womans University Hospital. The results were as follows; 1) Male to Female ratio was as 1 : 1, and peak age incidence was in the age group of 21 to 30. 2) Most frequent duration was 1 month to 1 year in the cases of the tinnitus. 3) The patient who complained tinnitus only was 10.0% and the patient who complained tinnitus with hearing impairment was 72.0% in the cases of tinnitus. 4) The affected site in the tinnitus, in order of frequency were; Both ear 38.7% Left ear 32.4% Right ear 28.9% 5) The drum finding, in order frequency were; Normal 48.0% Retraction 33.1% Perforation 8.4% 6) The degree of hearing loss in the audiometry were; Normal 29.2% Moderate severe 22.7% 7) The shape of hearing impairments were; High tone loss 46.9% Flat 33.0% Low tone loss 11.9% 8) The occurrence of $C_{5}$ dip was 11.0% in cases of the tinnitus. 9) The classification of hearing loss were; Sensorineural hearing loss 46.9% Mixed hearing loss 33.1 % Conductive hearing loss 20.1%

• The Journal of the Korean dental association
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• v.50 no.4
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• pp.203-210
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• 2012

Objective: The aim of this study was to investigate the incidence of the C-shaped canal of permanent mandibular second molar (PMSM) in Korean sub-population using Cone-Beam CT (CBCT) data and analyze the types of C-shaped canal. Materials & Methods: The protocol for this study was approved by the Institutional Review Board at the Pusan National University Hospital (E-2011039). Among the CBCT images taken of patients who visited the St. Bennedict Dental Hospital (Busan, Korea) from May 2008 to April 2011 for implant surgery and surgical removal of impacted teeth, high-quality CBCTs from 705 patients (361 male and 342 female) were screened and 607 PMSMs of 383 patients were evaluated retrospectively. All PMSMs were anatomically analyzed in detail by using image viewer software (EasyDent; Vatech). PMSMs were evaluated in the axial plane to investigate the shape of root and canals. The C-shaped canals were classified into five types. The total incidence, gender ratio, bilateral and unilateral appearance. and the correlation between right-side and left-side occurrences of C-shaped PMSMs were computed and compared statistically using the chi-square test. Results: Among the 607 PMSMs of 383 CBCTs of 187 females and 196 males, 198 PMSMs(32.6%) had C-shaped root and 158 PMSMs(26.0%) had C-shaped canals. The shape of C-shaped root canals at the furcalion level did not have significant change at the level of mid root (P<0.0001). Female had more prevalence of C-shaped root canals than male (P<0.0001). The prevalence of bilateral occurrence of C-shaped root canals was higher than unilateral occurrence. Conclusions: The occurrence of C-shaped PMSMs among a Korean population was 32.6% and was higher than other countries and ethnicities. Understanding the prevalence of PMSMs with a C-shaped root and/or canal in a Korean population may be useful for successful endodontic treatments.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.1
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• pp.185-194
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• 2001

This study was designed to evaluate the effects of angulation changes of head posture on the enlargement ratios of a lateral headfilm depending on the vortical or horizontal rotation of the objects. A device was constructed to measure regional changes of enlargement ratios. The device was held within the cephalostat and cephalograms recorded at each measured degrees of the device tilting, vertically and horizontally. The enlargement ratios of the horizontal, vertical, and angular measurements on the films taken at each tilted angulations were obtained and compared with those on the films taken without rotation. In summary, the enlargement ratios of the horizontal linear measurements were decreased during horizontal rotations. The enlargement ratios of vortical measurements of the right side on the film were increased and those of the left side were decreased by the horizontal rotations. Enlargement ratios of horizontal measurements were affected further than those of vertical measurements by the same angular changes of the horizontal rotations. Therefore, a disruption of parallelism between the object's midsagittal plane and the film could result in distortion of the image while vertical rotation around the object's porionic axis would not significantly affect the enlargement ratios on the headfilm.

• Journal of Korea Multimedia Society
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• v.13 no.3
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• pp.430-437
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• 2010

It is essential for living donor liver transplantation that surgeon must understand the hepatic vessel structure to improve the success rate of operation. In this paper, we extract the liver boundary without other surrounding structures such as heart, stomach, and spleen using the contrast enhanced MDCT liver image sequence. After that, we extract the major hepatic veins (left, middle, right hepatic vein) with morphological filter after review the basic structure of hepatic vessel which reside in segmented liver image region. The purpose of this study is provide the overall status of transplantation operation with size estimation of resection part which is dissected along with the middle hepatic vein. The method of liver extraction is as follows: firstly, we get rid of background and muscle layer with gray level distribution ratio from sampling process. secondly, the coincident images match with unit mesh image are unified with resulted image using the corse coordinate of liver and body. thirdly, we extract the final liver image after expanding and region filling. Using the segmented liver images, we extract the hepatic vessels with morphological filter and reversed the major hepatic vessels only with a results of ascending order of vessel size. The 3D reconstructed views of hepatic vessel are generated after applying the interpolation to provide the smooth view. These 3D view are used to estimate the dissection line after identify the middle hepatic vein. Finally, the volume of resection region is calculated and we can identify the possibility of successful transplantation operation.

• Korean Journal of Head & Neck Oncology
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• v.15 no.1
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• pp.70-75
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• 1999

Objectives: This study was designed to evaluate the methods of diagnosis and treatment of thyroid nodules. Materials and Methods : We performed a clinical review of patients with thyroid nodules, who were surgically treated at the Department of Surgery, College of Medicine, Chosun University from January 1996 to December 1998. Results: 1) The patients were divided into two groups; 65 patients(80.2%) with benign nodular disease and 16 patients(19.8%) with malignant disease. 2) The sex distribution showed a preponderance of females with a ratio of 5.2:1 in benign nodular disease and 3:1 in malignant disease. Benign nodules were more prevalent in patients in their 40's as compared to malignant nodules in patients in their 50's and 60's. 3) The most common duration of illness was 3 months, occurring in 45.7% of the total cases. 4) The most prominent symptom and sign was a palpable nodule in the anterior aspect of the neck. 5) The location of the nodule was ; 41 cases in the right lobe, 29 cases in the left lobe, and 11 cases in both lobes. 6) Thyroid scanning of 40 patients revealed cold nodules in 90.6% of benign nodules and in all malignant disease. 7) Fine needle aspiration cytology were performed in 32 cases of the 81 patients. Comparing with postoperative pathological findings, the results were the same in 87.5% of 32 cases. 8) Intra-operative frozen section study was performed in 56 cases of the 81 patients. Comparing with postoperative pathological finding, the results were same in 96.4% of the 56 cases. 9) The histopathological classification revealed that adenomatous goiters were the most common benign disease and papillary carcinomas were the most common malignant disease. 10) The most frequently employed operation for benign nodules and malignant disease was unilateral total lobectomy. When the metastasis was confirmed, lymphadenectomy and radical neck dissection was performed in malignant disease. 11) Important postoperative complications were transient hoarseness, transient hypocalcemia, hypothyroidism, wound bleeding, and hoarseness. Conclusions: The results of this study suggest that palpable nodules in anterior aspect of neck is revealed cold nodule by thyroid scanning and malignancy by fine needle aspiration cytology, which should be removed surgically. There is no difference in complication and survival rate with type of operation and lymphatic dissection. Therefore, procedure of operation is dependent on the site of nodule and involvement of lymph node.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1993.05a
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• pp.76-76
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• 1993

Endotracheal intubation is common technique for general anesthesia or patency of airway. However, laryngeal intubation granuloma is the most common sequale of endotracheal intubation in otolaryngologic field. From 1982 to 1992, the authors had experienced 16 cases intubation granuloma. The following results were as follows; 1. Age distribution was mostly in the 20 to 49 years old group (84 %).The sex ratio of male to female was 1:7, predominantly in female. 2. Main sx. were hoarse in 12(75%), F.B. sensation in 3(18%), dyspnea in 1 (6%). 3. The side of lesion was bilateral in 6 cases (37%) and unilateral in 10 cases (63%). Unilateral had the 3 cases (30%) in left and the 7 cases (70%) in right. The location of mass was vocal process of arytenoid cartilage in 8 cases(50%), post 1/3 of vocal cord in 6 cases (37 %) and middle 1/3 of vocal cord in 2 cases (12 %). 4. The duration between extubation and onset of symptom in less than a month was most frequent in 7 cases (44 %) out of 16 cases. 5. The most common operation was cesarean section in 6 cases (37 %). 6. Mean duration of intubation time was 2 hour 5 minutes. 7. Composition of used intubation tube was red rubber tube. 8. One case (6 %) was recurred.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.9 no.3
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• pp.257-265
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• 2016

In this study, an optimal design for motor-driven track type traveling system applied into high clearance working machineries in orchard is proposed. Tractive performance and hill climbing ability were predicted and evaluated for the optimal motor traveling system by taking into account of soil characteristics in orchard utilizing the high clearance working machineries. Design criteria for tractive performance were based on the traction force calculated from tractive effort subtracted by motion resistance, while hill climbing ability had its design criteria that fulfill the climbing 20% slope ground at a speed of 3km/h. Based on the evaluation results of traction and climbing ability, two DC48V, 4500rpm, 1.6kW AC motors were independently applied to both left and right side of orbits; each motor is designed to transmit power on driving sprocket of track type traveling system via 50:1 reduction gear ratio. The motor-driven track type traveling system developed in the study found to have 396 kgf of tractive force, which is 12.5% higher than climbing resistance at orchard soil having 20% slope ground (352 kgf), demonstrating sufficient tractive performance and hill climbing ability.

• The Journal of Korean Physical Therapy
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• v.2 no.1
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• pp.21-33
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• 1990

The purpose of this study is to investigated the occurrence properties of the cerebrovascular accidents. Clinical observations were done 252 cases, were carried from June, 1989 to May, 1990 at 4 general hospital in Taegu, Korea. The following results have been obtained ; 1. Among the 252 cases of cerebrovascular accidents, males was noted in $51.6\%$ and females in $48.4\%$. The ratio between males and females was 1.1 : 1 in whole groups of cerebrovascular accidents, and in aging distribution, it was showed variety distribution in age groups, fifties, sixties and forties were in order of frequency, particulary, more than half was shelved from 50 to 69. 2. Among the 252 cases of cerebrovascular accidents, cerebral hemorrhage was rioted in $64.3\%$, cerebral infarction in $25.8\%$, cerebral thrombosis in $6.3\%$, subarachnoid hemorrhage in $2.4\%$ and cerebral embolism in $1.2\%$. 3. In distribution of academic career, high school level was noted in $37.7\%$, elementary school level in $30.5\%$, middle school level in $17.1\%$, elementary school level in $30.5\%$, middle school level in $17.1\%$ arid college level in $14.7\%$. 4. In distribution of occupation, office worker was noted in $21.8\%$, housewife in $20.2\%$, the others in $19.1\%$, physical laborer in $18.3\%$ and inoccupation in $18.3\%$. 5. In seasonal distribution, spring was noted in $34.9\%$, winter in $32.5\%$, autumn in $20.3\%$ and summer in $12.3\%$. 6. Among the preceding diseases at the onset of cerebrovascular accidents, hypertension was noted in $51.6\%$, no preceding disease in $20.2\%$, other disease in $10.3\%$ and diabetes mellitus in $9.5\%$ and cardiovalvular disease in $6.0\%$. 7. In systolic blood pressure on admission, 160-199mmHg was noted in $32.2\%$, 200-239mmHg in $23.4\%$, 140-159mmHg in $19.4\%$, below 140mmHg in $16.3\%$, and above 240mmHg in $8.7\%$, While, in diastolic blood pressure, above 130mmHg noted in $24.6\%$, below 90 mmHg in $17.1\%$, 120-129mmHg in $13.1\%$ and was 90-99mmHg in $11.1\%$. 8. In major predisposing factors of patients, emotional stress was noted in $20.2\%$, physical action in $17.9\%$, rest in $16.9\%$, while sleeping in $10.7\%$, drinking in $9.9\%$ and defecation in $7.9\%$. 9. In distribution of affected side, left was noted in $48.4\%$, right in 42.1 and both $9.5\%$. 10. In rates of recurrent cases, first attach was noted in $79.0\%$, 1st recurrence in $17.0\%$, 2nd recurrence in $3.6\%$ and 3rd recurrence in $0.4\%$.

• Journal of The Korean Ophthalmological Society
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• v.59 no.11
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• pp.1091-1096
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• 2018

Purpose: We report a case of bilateral nonarteritic anterior ischemic optic neuropathy (NAION) following acute angle-closure crisis (AACC). Case summary: A 76-year-old female visited our clinic because of a 1-day history of ocular pain and vision loss in both eyes. The visual acuity was 0.02 in both eyes and her intraocular pressure (IOP) was 52 mmHg in the right eye (RE) and 50 mmHg in the left eye (LE). She had corneal edema and a shallow anterior chamber in both eyes, with 4 mm fixed dilated pupils. After decreasing the IOP with intravenous mannitol, laser iridotomy was performed. However, 2 days later, visual acuity was further reduced to finger counting at 10 cm RE and at 50 cm LE, and her optic disc was swollen. Bilateral NAION following AACC was diagnosed. One month later, visual acuity slightly improved to 0.02 RE and 0.04 LE, and the optic disc edema resolved. A small cup-disc ratio, optic disc pallor, and atrophy were observed. Humphrey visual fields demonstrated superior and inferior altitudial visual field defects in the LE, and almost total scotoma in the RE. Conclusions: AACC can be a predisposing factor for NAION, so the relative afferent pupillary defect, papilledema, and presentation of other risk factors are important clues to a diagnosis of NAION.