하악의 전방 이동이 상부기도의 용적에 미치는 영향

최재갑,기우천,강덕식,Choi, Jae-Kap,Kee, Woo-Cheon,Kang, Duk-Sik 대한안면통증구강내과학회 1999 Journal of Oral Medicine and Pain Vol.24 No.1

OBJECTIVES: This study was designed to measure the minimal cross-sectional areas and volumes of the pharynx in snoring patients and normal subjects and to see if there is an increase in the minimal cross-sectional areas and volumes of the pharynx with advancement of the mandible. METHODS: The pharyngeal computed tomography and 3-dimensional reconstruction were used to measure the cross-sectional areas and volumes of the nasopharynx, oropharynx, and hypopharynx with the jaw in normal position and in protrusive position in 7 patients with snoring and 7 control subjects while they were awake. RESULTS: The oropharynx was revealed to have the most narrow site in the pharynx and there was a tendency for the snorers to have a smaller nasopharyngeal and oropharyngeal cross-sectional area than normal subjects but not statistically significant. There were no significant differences in the volumes of the nasopharynx and oropharynx between the two groups. With advancement of the jaw the minimal cross-sectional area of oropharynx was significantly increased, and the volume was also increased but not significantly. The minimal cross-sectional areas and volumes of nasopharynx as well as hypopharynx were not significantly influenced by the advancement of the mandible. CONCLUSIONS: There was a tendency for snorers to have a smaller oropharynx than normal subjects and the oropharyngeal lumen was increased with the advancement of the mandible in both snorers and normal subjects.

하악의 위치 변화가 기도저항에 미치는 영향

최재갑,정태훈 대한안면통증구강내과학회 1998 Journal of Oral Medicine and Pain Vol.23 No.1

This study evaluated whether substantial airflow resistance changes occurred by changing jaw position in normal and snoring subjects. A case-control design was utilized to assess group differences. Subjects included 11 snoring patients and 10 non-snoring subjects. Airway resistance was assessed using a whole body plethysmograph. Subjects in this study had their mouth opening standardized to a position of 7 mm of vertical separation and the resistance was measured under the following conditions; normal jaw position and 2/3 maximum protrusive jaw position. The results were as follows : 1. The airway resistance was higher in snoring group than in non-snoring group. 2. Both groups had a significant decrease in their airflow resistance upon jaw protrusion. In conclusion, these data document that airflow resistance can be significantly influenced by jaw positioning. Moving the jaw in a protrusive position produced reduction of resistance.

악관절 장애환자의 진단 및 평가(Diagnosis and Evaluation)

최재갑 대한치과의사협회 1991 대한치과의사협회지 Vol.29 No.5

MPDS 환자의 임상적 양상

최재갑,정운하 대한안면통증구강내과학회 1982 Journal of Oral Medicine and Pain Vol.7 No.1

The author has studied on the clinical features and symptomatology of 97 MPDS patients, who visited the Dept. of Dentistry, Kyungpook National University, from January to September in 1982. The results were as follow : In age and sex distribution of patients in this population, the third decades appeared to have the highest prevalence and the male to female ratio was almost 1 to 2.23. As to occupation, students and housewives were revealed to have the highest incidence of MPDS. The chief complaints of patients were pains, TMJ noises, and limitation of mouth opening in order of frequency, and the most prevalent site of symptom was that of preauricular area. In symptom sequence, the majority of initial symptoms were TMJ noise and pain but limitation of mandibular movement was progressively developed, regardless of nature of early symptoms. Chronic unfavorable oral habits were found to be the most possible predisposing factors in this study. The average maximum interincisal distance was $38.13\pm10.00mm$ in males and $30.73\pm8.75mm$ in females, and a deviation of mandible during mouth opening was observed in 60.8% of patients. In TMJ signs, tenderness of the TMJ to palpation was found in 60.8% of patients and TMJ noise was audible in 50.5% of patients with a stethoscope. The muscles of masticatory system were palpated according to usual methods, and a significant indidence of muscular tenderness was present, with the lateral pteygoid muscles being most frequently involved, followed by masseter, medical pterygoid and temporalis muscles.

우리나라 쟁기와 Plow의 산인저항의 관한 비교연구

최재갑 한국농공학회 1970 韓國農工學會誌 : 전원과 자원 Vol.12 No.3

Korean Janggi and Western plow to have developed for a long time in the east and west were tested and compared in their draft resistance. The charaderistic of Korean Janggi and plow to be able to make deep plowing, on of the most important factors influeneed the increased yield, were ofserved. The study was undertaken to obtain these basic factors' to device and construct the deep plowing Janggi. The results were as follow; 1. The draft resistance of Korean Janggi far less than that of plow and on the dry field, the influence of soil moisture contant to the draft resistance was larger in the Korean Janggi than in the western plow, but on the rice paddy, there was not differences between them. 2. The plow was more stable than that of Janggi in their operation. 3. The relation ship between the specific draft resistance and plowing depth was shown bygthe carved equation. $$K=Ax+\frac{B}{x}+C$$(K ; specific draft restance, x; plowing depth) A, B, C; Constant controled by soil and instrument factor) 4. Minimam values of the specific draft resistance were as follow; a. On the dry field; Korean Janggi; x = $8{\sim}14cm$ $4K=280{\sim}330gr/cm^2$$ Westean plow; x=$10{\sim}12cm$ $$K=480{\sim}490gr/cm^2$$ 6. On the rice paddy; Korean Janggi; x=$8{\sim}12cm$ $$K=255{\sim}280gr/cm^2$ Western plow; x=$7{\sim}10cm$ $$K=415{\sim}420grc/m^2$$

수도이양기 제작과 그의 실용화에 관한 연구

최재갑 한국농공학회 1972 한국농공학회논문집 Vol.14 No.4

건조기 고안 제작에 관한 연구

최재갑 한국농공학회 1975 한국농공학회논문집 Vol.17 No.1

A newly devised dryer with heated air for the farm products, especially suited for high water content materials such as red pepper, Beer ground, each Vegetables, and Low water content materials such as Rough rice was tested for its thermal efficiency and drying mechanism, and the optimum conditions for each sample were established. In order to improve the present rural situation of drying farm products which entirely dependent upon natural solar radiation, a study upon an economic multi-parpose dryer was conducted. A series of drying tests were run first with red pepper which is one of the important cash crop in Korean farm. And successive series of tests were also run with such proaucts as garlic, sweet potatoes, green onion, radish, Beer ground and Rough rice. The results from the above experiment in drying system with heat dryer can be summarized as follows. 1. Drying duration could be shortened by the tempering effect in high water content crop such as red pepper and beer ground. 2. The color changes occured in around 20% water content in red pepper. The degree of color change was heavily affected by high temperature and short drying duration. 3. The drying condition of red pepper was most favourable at the temperature of 85$^{\circ}C$ in early stage and 80$^{\circ}C$ in middle stage and 75$^{\circ}C$ at the final stage, and with the air rate of 0.81㎥/sec and with sample amount of 200kg. 4. The drying condition of Rough rice(I.R.667) was most favourable at the templature of 40$^{\circ}C$ in early stage and 35$^{\circ}C$ in middle stage and final stage and with the air rate of 0.2㎥/sec and with sample amount of 75kg. 5. In order to prevent the color change of red pepper and to assure high efficiency in drying mechanism, it was necessary to lower the temperature as the time passes in drying process. 6. For vege tables, the drying rate were short in early stage and there was also tempering effect. However, for garlics, Constant drying rates through the early and final stages were observed and there were no tempering effects. 7. The drying condition or capability were as follows; Sample drying temp($^{\circ}C$) amount of material(kg) drying time(hr) Red pepper 85 200 9 Garlic 85 150 7 Sweet potato 85 200 6 Green Onion 85 200 4 Carrot 85 200 4 Radish 90 250 4 Rough rice(I.R.667) 35 75 4 Beer ground 90 320 3 Considering the above result of experiments, if this kind of dryers were distributed Korean farm and the optimun process were practiced in rural area, it would certainly help them improving the qualites of their product preventing their undue losses, and thus assuring an increase of Korean farm income and promotion of their living standards.

우리나라 농업기계화에 관한 조사연구

최재갑 한국농공학회 1971 한국농공학회논문집 Vol.13 No.3

1. The historical development of the agriculture in Korea is observed and the future of Korean agriculture is suggested with present situation in order to recommend a direction of policy in agricultural mechanization. 2. A factor analysis of agricultural mechanization The needs of agricultural mechanization in the view of both national need and the armer's desire under the present situation are analyzed with data from the various sources. The researcher found that the agricultural mechanization is badly needed to develop prospective Korean agriculture to future. 3. The direction of agricultural mechanization. It can be said that the position of agriculture in the national economy plays a very important role. This importance should not be ignored by the Politicians in their process of developing long range economy plan. The agricultural mechanization for the modernized Korean agriculture should be directed to increase the most effective results with minimize the least sacrifice. The merry tiller is recommended to the main agricultural machinery in Korea in order to meet its small farming operation un-its(or farm size). Tractor is recommended in the plain area for the crop cultivation. The cooperative cultivation for rice and the upland crops will be developed in the plain area. Tractor, therefore, is recommended for the main agricultural machinery in these areas. Either tractor or merry tiller is recommended to the orchard area by its operating size of the orchard. The researcher also disoussed about the development of animal husbandry on the farm with increasing the farm size in order to develop meadow and pasture nuder the consideration of both the improvement of food consumption and the comprehensive development of national resources. 4. Relationship between the Performance of various agricultural machinery and the economic scale. Because of the agricultural machinery needs an expensive fixed expense(fixed cost) the total expense Per ha of the fixed expense and the operation expense should less than the traditional expense Per Dan Bo with in creased corpgiclds Per Dan Bo. Since the anual fixed expense of the agricultural machinery is figured out by the durability the more the farm size the less fixed expense of machinery is required. The formula of this principle is as follows; fixed expense for Dan Bo=Fixed expense of agricultural machinery farm size(or farming scale) The breaking-even point is the balance point between the expense of the using agricultural machinery and the traditional farming expenses. Labor cost of the Dan Bo is increasing when the management scale increases by the tradititional farming while the machanized management decrease the management cost Per Dan Bo. The reseracher found that the distribution of agricultural machinery will be the adeventeous after the year of 1981 by the result of frguring out the breaking-even point. 5. The Investigate and the conclusion. The purpose of this study is found out the direction of agricultural machanization and the breaking-even point of various agricultural machinery, there for is found out effective of the using various agricultural machinery for Collection cutter, Binder, Footing thresser, Semi-power thresser, Power thresser, Combine, Power rice-Trans-Planter, etc.

구강작열감증후군 환자의 미각역치에 관한 연구

최재갑,허윤경 대한안면통증∙구강내과학회 2004 Journal of Oral Medicine and Pain Vol.29 No.2

Purpose: Because there are a large number of reports suggesting that burning mouth syndrome has a strong psychogenic component, any objective evidence found of taste dysfunction in BMS would suggest that there may be an organic basis to the altered sensations reported for BMS subjects. Therefore, the aim of this study was to investigate taste function in subjects diagnosed as having BMS in order to determine if there is an organic/neurologic component in the etiology of BMS. Materials and Methods: The study involved 12 BMS subjects (mean age±SD 61.25±7.41 years; 10 females, 2 males) presenting to the Kyungpook National University Hospital, Department of Oral Medicine with a chief complaint of burning mouth. In addition, 10 control subjects were also examined. Taste detection thresholds for the taste modalities of sweet, salt, sour, and bitter were obtained in control and BMS subjects with a forced-choice tracking procedure using serial solutions of sucrose, sodium chloride, citric acid, and quinine hydrochloride. Results: Compared with control subjects, BMS subjects as a whole displayed higher taste detection threshold for sucrose, citric acid, and quinine HCl. The difference was more prominent in sucrose and citric acid. Conclusion: These findings indicate that psychophysical changes in taste perception may be involved in the occurrence of sensory complaints reported by BMS subjects.

수면무호흡증 환자에서 상부기도의 협착 부위 및 순응성이 하악전방이동장치에 의한 치료효과에 미치는 영향

최재갑,허윤경,이종민 대한안면통증∙구강내과학회 2004 Journal of Oral Medicine and Pain Vol.29 No.2

Background and Objectives: The upper airway caliber shows rhythmic changes according to the respiratory cycle. The dynamic imaging technique is needed to demonstrate nonfixed oropharyngeal obstruction in patients with snoring and/or obstructive sleep apnea. This study was designed to determine the level, extent, and dynamics of the oropharyngeal closure from the dynamic view of the oropharynx and to assess the treatment outcome of the mandibular advancement device according to obstruction site and collapsibility of the oropharynx Materials and Method: The upper airway was scanned in 16 patients by using EBT while awake, asleep, with and without insertion of mandibular advancement device at least during 2 respiratory cycles. Portable polysomnography was performed before and after treatment. Results: Of 16 subjects 8 showed obstruction at velopharynx, 5 at oropharynx, and 3 at both of the velopharynx and oropharynx. The mean RDI decreased from 24.79±14.79 to 13.22±13.92 after treatment. The amount of RDI decrease is 37.86% in velopharyngeal obstruction group and 61.87% in oropharyngeal obstruction group. Conclusion: A mandibular advancement device is effective in decreasing obstructive sleep apnea during sleep wherever the obstruction occurs at velopharynx or oropharynx. Nevertheless, it is more effective in the patients with oropharyngeal obstruction rather than the patients with velopharyngeal obstruction.