• Journal of the korean academy of Pediatric Dentistry
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• v.43 no.4
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• pp.401-409
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• 2016

This research investigates into overall oral health status of adolescent girl inmates in a juvenile detention facility and ordinary school students in the same age range of 11 to 18 years old and compares the results focusing on the difference between the two groups. The last 5 years dental records for girl inmates in Juvenile detention facility and for students who have visited the Department of Pediatric Dentistry at Ajou University Hospital was colleted and analyzed. The restorative treatments took up the greatest part in their history of treatments. While the percentage of extractions of permanent teeth due to dental caries had been gradually increased, in Juvenile detention facility students, throughout the transition period from middle school to high school, in dental hospital patients, the phenomenon of the same kind has hardly been detected. After that record analysis, oral examination for Juvenile detention facility students and dental hospital patients was conducted. DMFT index for dental hospital patients are 4.15, whereas, the value for Juvenile detention facility students are as twice as high to be 7.53.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.151-151
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• 2017

본 연구는 인력을 이용한 품질검사를 수행하고 있는 현장에서 불량 및 품질에 대한 신뢰성이 떨어지고 있는 현상을 해소하기 위해 자동으로 평면도를 측정하고자 하였다. 설계는 Auto CAD를 이용하였다. 평면도 측정기의 크기는 가로${\times}$세로${\times}$높이를 $1000{\times}600{\times}1800mm$로 하였다. 프레임은 $60{\times}60$ 프로파일을 이용하였고 다른 구성 부품은 SUS304 재질을 이용하였다. 측정대상을 올려놓은 상태에서 녹색 버튼을 누루면 작동되도록 되어 있다. 그림 8은 측정결과를 나타낸 것이다. 측정기는 국내업체인 데바의 모델명 EA-20N의 Air Micrometer을 사용하였으며 측정핀의 위치는 조정이 가능하도록 하였다. 평면도 측정 중 설정치수와 같이 않으면 NG 명령과 함께 부저가 울리도록 프로그램하였다. 불량이 발생하면 그림 8과 같이 나타났다. 불량 측정을 위해 측정부의 결과 값이 나타나며 불량이 발생하면 어느 위치에서 불량이 발생했는지를 알 수 있도록 하였다. 또한 결과 값은 자동으로 저장되도록 하였다. 품질확보를 위해 100EA를 측정한 결과 0.00258, 0.00259, 0.00259, 0.00263, 0.00251, 0.00286, 0.00275의 평균값을 나타냈다. 측정값의 검증은 하이트게이지로 측정한 결과 0.002 이내의 결과를 나타냈다. 따라서 본 평면도 측정기를 이용한다면 생산성 향상이 가능하여 가격경쟁력이 있다고 판단된다.

• Journal of the korean academy of Pediatric Dentistry
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• v.34 no.3
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• pp.498-505
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• 2007

Management options for impacted maxillary canines can include (1) continued observation, (2) extraction of the primary canine to aid spontaneous eruption, (3) uncovering and bonding of the impacted tooth and its eruption using orthodontic traction, (4) autotransplantation, and (5) extraction followed by prosthetic replacement. Autotransplantation should be considered when the degree of malposition is too severe to correct by orthodontic alignment. The present report describes the management of an ectopic eruption of the left maxillary canine in an 10-year-old girl. The treatment included the extraction of primary maxillary left canine and the autotransplantation using a Rapid Prototyping model. By using RP model to contour the recipient bone and check for fitting in the prepared socket, the extra-oral time can reduce. The autotransplanted canine showed mobility within normal limit, negative response to percussion and positive to electric pulp test after 6 months.

• Journal of Korean Ophthalmic Optics Society
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• v.9 no.2
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• pp.397-415
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• 2004

This study surveyed differences among KS, ISO, JIS and ANSI ophthalmic spectacle lenses standards. These standards applied to several lenses that were in common currency and we checked over problems and improvements in KS. KS corresponded to ISO, for the most part, and ANSI, partly. But terms, definitions, progressive power lenses standards, UV transmittance and base curves clauses did not exist in KS. There was no differences between nominal data and actual data in important clauses estimation-minimum requirements on refractive power, tolerances on the size of lenses, material and surface quality. But tolerances of thickness, base curves, UV and visible transmittance values were not existing, there were differences among several ophthalmic spectacle lenses in the test of these clauses. These requirements will be needed for better and more comfortable vision.

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.4
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• pp.365-370
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• 2012

International Organization for Standardization has recently published ISO 12215-5 which is the small craft-hull construction and scantling. According to ISO 12215-5 AnnexB, the scantling determination can be accomplished by drop test for craft with a length $L_H$ of 2.5m up to 6m and single-skin construction. The current method, however, of visual test has the issue where it is difficult to make an objective evaluation of ship body strength. In this study, in order to develop an evaluation system that can make a quantitative evaluation of the drop test of leisure boats, the domestic/foreign regulations on drop test of leisure boats are analyzed and the drop test evaluation system is designed, and the system applicability is reviewed through 5-meter level aluminum ship, and the issues incurred by the state of the ship and the posture while dropping were checked.

• Journal of the Korean Society of Costume
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• v.47
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• pp.113-124
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• 1999

Hospitals in Korea are having trouble with economic matters because of the low cost of medical insurance and the consumer's demand for high-quality care. The management of patient clothing is very difficult Especially for the management of size is very difficult because the mix of patients in the wards is very different from the stocked clothing sizes. Because of economic matters the ward dose not prepare enough clothing for every size. The nurses in the wards have trouble managing the clothing. Therefore the nurses want free-size patient clothing for all patients. The problem of managing the patient's clothing were surveyed by nureses in the wards. It was known that the free-size patient clothing was needed. The clothing designed from 150cm, to 180cm by 5cm were made. The different sizes of clothing were pretested. The experimental clothing were selected. The experimental patient clothing are designed for between from 165cm and 170cm in height which refers to Korean average. The fitness and sensory test were made by medical personnel outpatient who will be future client for hospital and by specialist in clothing. Finally The free-size patient clothing was made. It was said that there is no difference between the C-type (170cm) and the D-typer(165cm) clothing by specialists in clothing. The outpatient future client for hospital liked the C-type was selected. The questionnaires of the C-type patient clothing was tested by outpatient patients and by medical personnel. Eighty-four point-eightprecent(84.8%) of evaluators liked free-size clothing 75.8% liked unisex use.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.2
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• pp.195-201
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• 2012

According to many customers' requests, optical measurement module (OMM) applications using automatic measuring devices to measure the machined part rapidly on a machine tool have increased steeply. Touch trigger probes are being used for job setup and feature inspection as automatic measuring devices, and this makes quality checking and machining compensation possible. Therefore, in this study, the use of touch trigger probes for accurate measurement of the machined part has been studied and a macro program for a hole measuring cycle has been developed. This hole is the most common feature to be measured, but conventional methods are still not free from measuring error. In addition, the eccentricity change of the least square circle was simulated according to the roundness error in a hole measurement. To evaluate the reliability of this study, the developed hole-measuring program was executed to measure the hole plate on the machine and verify the roundness error in the eccentricity simulation result.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.6
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• pp.669-678
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• 2002

Currently, the domestic interests on the development of eyesight related measuring instruments are being increased. So we are developing such an electronic system of Refracto-keratometer, which contains a software and a hardware both. If this system could inform the examiner of the precise eyesight measuring result from the treatment of the image of optical system, then potentially the number of missed measuring results could be reduced. Our electronic system has been developed from the two areas divided into a software and a hardware. The software area was focused on the more exact eyesight measuring results, using morphological filtering methods and gray-leveled signal enhancing techniques. The hardware area is performing the same functions as the existing other systems. Besides, it provides the embedded software with free variables which could reduce the developing duration sharply as well as enlarge many kinds of application-extensions. Therefore, this electronic system has made effective eyesight measurement possible as the result of reducing the differences applied to sophisticated eyesight measurement.

• Journal of the korean academy of Pediatric Dentistry
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• v.44 no.2
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• pp.194-199
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• 2017

This study investigated the prognosis of luxation injuries in primary teeth treated with splinting. This study retrospectively analyzed 92 children with luxation injuries to their primary teeth who were treated with splints between 2010 and 2015. Prognoses were analyzed in patients who had been followed for more than 6 months. The prognoses with splinting were based on clinical and radiographic evaluations performed during the follow-up examinations. The mean patient age was 42.1 months, and 67.4% were male. The most common cause of luxation injury was falling, and the mean splint duration was 2.4 weeks. The success rate of splinting was 58.9%. The highest rate of success was achieved following subluxation, while repositioning and splinting of lateral luxation had the lowest rate of success. Pulp necrosis was the most common unfavorable prognosis in the luxation injuries. Depending upon the type of luxation, splint therapy had acceptable prognoses and might be a feasible treatment option.

• Journal of the korean academy of Pediatric Dentistry
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• v.36 no.1
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• pp.96-101
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• 2009

Regional odontodysplasia(ROD) is relatively rare localized developmental anomaly of tooth formation in which hard tissue is affected. The maxilla is typically affected than the mandible, and especially the maxillary left quadrant is the most commonly involved. Females are affected twice as often as males, and there is no association with race. Its etiology remains undetermined, but local circulatory disorders, somatic mutations, virus infections, local trauma, hyperpyrexia, irradiation, metabolic disturbances, and hereditary transmission are considered as possible etiologic factors. The affected teeth are likely to be small, hypoplastic, brown, and grooved. Eruption failure or delay is frequently seen as well as abscess or fistulae formation in absence of caries. Radiographically, there is a lack of contrast between the enamel and dentin, both of which are less radiopaque than unaffected counterparts. Moreover, enamel and dentin layers are thin, giving the teeth a “ghost-like appearance”. The pulp chambers and canals are large, the roots seem like to be short and indistinct. A 2-year-3-month old boy came to the department of pediatric dentistry, Yonsei University, with the chief complaint of delayed eruption and abnormal tooth shape on the lower left quadrant. He was diagnosed as regional odontodysplasia based on the clinical and radiographic findings.