• KSBB Journal
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• 제8권2호
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• pp.126-132
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• 1993

The objective of this study was to develop an artificial dentin for easy handle and accurate observation of the mechanism on dental caries and to screen biologically active materials from the extracts of traditional plants and fruits for prevention of early dental cares. In order to produce disc PAHA (artificial dentin), the powdered hydroxylapatite was immobilized in a 20% polyacrylamide gel. The characteristics of disc PAHA was very similar to the surface, figure and lattice of human enamel. After decalcification in 0.1M citric acid based on observation with SEM. The critical point of decalcification of disc PAHA by acids was found to be pH 5.0-5.5, which was hi agreement with human enamel. The degree of decalcification from disc PAHA in 0.1M citric acid solution was sixfold higher than that of human enamel. This result suggested that disc PAHA would be useful as a substitute of human enamel for in vitro experiment. The extracts of garlic and Flower Apple A, B seemed to inhibit growth of S. mutans. Especially, when the 300$\mu\ell$ of its extracts added to the medium to incubate S. mutans, F. apple B showed strongly an inhibitory effect in both the growth of S. mutans and the synthesis of insoluble glucan.

• 대한약침학회지
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• 제13권2호
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• pp.111-120
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• 2010

Objective: This study is to evaluate the effectiveness of the oriental medicine treatment on lumbar disc herniation. Subjects and Methods : The clinical analysis was done on 32 cases of patients with lumbar disc herniation diagnosed by lumbar CT scan. Patients who admitted In Cheongju Oriental Medicine Hospital from April 2007 to April 2008 were analyzed according to the distribution of sex, age, the period of disease, condition on admission, the symptom on admission, Admission day, the treatment efficacy at discharge day. Results : 1. The forties was the most, the acutest phase the most, the day of 8-14 days the most. 2. Multiple bulging disc in 37.5% of CT scan was the most common, followed by a single HNP was 28.1%. 3. Almost 81 % patients showed effective efficacy under VAS 3 at discharge day. 4. Single bulging and herniated disc were more short admission days than multiple bulging and herniated disc.

• 한국소음진동공학회논문집
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• 제12권5호
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• pp.338-345
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• 2002

The study presents a new testing and analysis method for brake judder on vehicle. For the identification of the excitation mechanism of a brake judder, it is necessary to measure the dynamic brake disc geometry during braking on vehicle. The non-contact sensor system was used to monitor the brake disc geometry. Brake torque variation (BTV) caused by disc thickness variation (DTV) is the primary excitation for brake judder. The mechanical effects generating BTV are linked not only to initial manufacturing tolerances but also to uneven wear. Therefore, the brake disc geometry should be strictly managed to initial condition. The aim of this study has been to measure the dynamic DTV and runout on vehicle and analyze the influence of test parameters on brake judder and compare the disc component with vehicle matching about the DTV Profile. As a result of this study, The amplitude of brake judder is proportional to vehicle speed and fluid pressure fluctuation on braking. The major sources of brake judder are directly related to disc thickness variation and side runout variation of corner assembly (disc, hub. bearing).

• 대한한의학회지
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• 제16권2호
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• pp.62-78
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• 1995

In industrialized countries, low back pam is very common, with up to 60 to 80% of the population being affected at some time in their lives. Herniated lumbar intervertebral disc is one of principal cause of low back pain and radiculopathy. The therapy of the disease is classified into conservative treatment or surgical intervention. The majority of these cases successfully heal with conservative managemant, even though it was claimed that the henirated disc material would not resolved spontaneously without surgical removal. It was reported that there was no significant difference in outcome and cost effectiveness between conservative and surgical therapy group. Also after conservative therapy the resorption of herniated disc with satisfactory improvement of symptom was reported. Conservative treatment includes bed rest, heat, drug therapy, therapeutic exercises, physical therapy such as traction and manipulation, and acupuncture. These managements show favorable outcome in the patients with herniated lumbar intervertebral disc. So conservative management should be applied in the therapy of herniated intervertebral disc, unless there exist aggravation during the first 3 weeks of treatment or apparent surgical care indication. And further investigation to improve effectiveness of conservative therapy should be ensued.

• KIEE International Transactions on Electrophysics and Applications
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• 제3C권5호
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• pp.165-170
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• 2003

This paper presents development of solid core suspension disc insulators (cap and cap suspension disc insulator) for replacing cap and pin suspension disc insulators in overhead transmission and distribution lines which expose to lightning discharges. By this means the punctured problem caused by steep front surge voltage created by lightning discharge on the lines can be solved. The solid core suspension insulator was designed and constructed based on the dimensions of conventional suspension disc insulators (cap and pin insulators). The insulators are made of alumina porcelain. The electrical and mechanical characteristics of the solid core suspension insulators were carried out. The puncture test was performed in the air by applying steep front impulse voltage with amplitude about 2.5 per unit of 50% flashover (CFO) of the insulator unit at negative standard lightning impulse $1.2/50\;\mu\textrm{s}$ with steepness up to $9200\;kV/\mu\textrm{s}$. The testing results show that solid core suspension disc insulators are not punctured eventhough the steepness of the steep front impulse voltage was increased up to $9200\;kV/\mu\textrm{s}$.

• Journal of Acupuncture Research
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• 제18권6호
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• pp.84-92
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• 2001

Objectives : We defined that the ruptured disc is extruded trans ligamentous through the posterior longitudinal ligament or sequestrated. The authors have experienced 12 cases of ruptured disc that underwent the conservative treatment. We studied the effect and possibility of the conservative treatment for the ruptured disc. Methods : The patients with ruptured disc have underwent the conservative treatment. After the treatment, we compare pre-treatment with post treatment in the view of state of patients' ambulation and physical conditions. Results : In this study, 12 cases of ruptured disc have underwent the conservative oriental treatment. After the treatment, 75% of the cases were improved above good state Conclusion : The ruptured disc has been operated universally. Except the emergency state, the conservative treatment is helpful to improve the symptoms of the patients with ruptured disc.

• 대한기계학회논문집A
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• 제33권7호
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• pp.637-644
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• 2009

We have analyzed the biomechanical characteristics of cervical spine after total disc replacement using finite element analysis. A finite element model of C2-C7 spinal motion segment was developed and validated by other experimental studies. Two types of artificial discs, semi-constraint and un-constraint, were inserted at C6-C7 segments. Inferior plane of C7 vertebra was fixed and 1Nm of moment were applied on superior plane of C2 vertebra with 50N of compressive load along follower load direction. Mobility of the cervical spine in which each artificial disc inserted was higher than that of intact one in all loading conditions. Also, high mobility at the surgical level after total disc replacement could lead higher facet joint force and ligaments axial stresses. The results of present study could be used to evaluate surgical option and validate the biomechanical characteristics of the implant in total disc replacement in cervical spine.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제34회 춘계학술대회논문집
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• pp.101-104
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• 2010

다중펄스 로켓모타에 적용하려는 격벽형 펄스분리장치에 대한 설계를 진행하였다. 펄스분리장치의 부품인 파열판의 Slit 형상과 용접조건 및 Seal Disc 적용여부 등 설계인자를 변경하며 설계하였다. 설계 및 제작된 펄스분리장치에 대한 공압 파열시험을 실시하여 Slit 개수 및 용접강도 증가, Seal Disc 적용에 따라 파열압력이 증가함을 확인하였다.

• 에너지공학
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• 제27권4호
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• pp.13-19
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• 2018

본 연구에서는 위상최적화에 기초한 발전설비용 버터플라이 밸브 디스크 부품의 경량설계가 수행되었다. 이때 상용 유한요소해석 소프트웨어가 사용되었으며 기존 상용 밸브 디스크의 외형을 유지시키면서 내부의 불필요 공간을 제거하여 경량구조를 갖도록 하였다. 먼저 밸브 디스크의 원판과 브라켓을 분리하여 각각 최적설계 하였다. 최적의 형상이 선정되면 이들을 조립하여 3차원 경량 밸브 디스크 모델을 완성하였다. 이후 이 모델에 설계 압력을 적용하여 유한요소해석 후 구조적 안전성을 확인하였다.

• International Journal of Clinical Preventive Dentistry
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• 제14권4호
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• pp.241-246
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• 2018

Objective: This study was performed to verify how DISC behavior patterns affect the major satisfaction and professionalism of dental hygiene students and provide basic data for dental hygiene students to have increased major satisfaction and maximize their strength by understanding their DISC behavior pattern. As a result, the following conclusion was obtained. Methods: The data was collected From November 1, 2018 to November 14, 2018, 218 dental hygiene students. Data was collected using self-reported questionnaires. Statistical analysis was performed with IBM SPSS ver. 21.0. Mean (standard deviation) and one-way ANOVA & pearson correlation were performed. Results: The most frequent DISC behavior patterns of dental hygiene students was steadiness types (49.0%) followed by influence types (34.5%), conscientiousness types (9.0%), and dominance types (7.5%). There were no significant difference in professionalism and major satisfaction according to DISC behavior patterns in dental hygiene students. There was a correlation between major satisfaction and professionalism of dental hygiene students. Conclusion: In conclusion, in order for dental hygiene students to establish positive professionalism through increased major satisfaction, it is necessary to make various efforts such as providing consultation and education that corresponds to each student's DISC behavior patterns. These efforts will provide the students career vision and encourage them to improve their academic achievement and find employment that fits their vocational aptitude.