Caries Prevention by Use of the Computer Program on Diet Control for Adolescent

Kyoung-Hye Min,Bo-Ram Cho 대한예방치과학회 2017 International Journal of Clinical Preventive Denti Vol.13 No.1

Objective: In order to utilize dietary control, one of ways to prevent dental caries, more easily, the sugar content and viscosity of food were measured to obtain cariogenic index. Using this index, this study is to contribute to having proper eating habits through improvement of eating habits and to the prevention of dental caries through the use of computation program for dietary control. Methods: A 5-day dietary log from 105 students in the first year of high school, who are residing in Cheonan, and the result of survey was entered into the existing computation program for dietary control to examine calorie intake, 3 major nutrients and deficiency of clean food intake count, cariogenic index; S-PHP index and Snyder test were performed to examine the correlation of each category with oral health. Results: The ratio of average daily intake of 3 major nutrients was 62.4:19.9:17.7 respectively, and the average daily intake count of clean food was 2.44±1.71, which was appropriate. The average cariogenic index, 152.89±65.45 min. Since cariogenic index (r=−0.535), S-PHP index (r=−0.338) and Snyder test (r=−0.365) decreased as clean food intake count increased, they showed a relatively high correlation (p<0.01). Conclusion: Computation program for dietary control enables analyzing adolescents’ dietary habits by category and leads them to have proper eating habits through improvements in eating habits, which will result in dental caries prevention and oral health improvements; therefore, utilization of the program for preventive care in clinical environment is recommended.

레진시멘트의 접착 내구성에 관한 연구

조민우,박상혁,김종률,최경규 대한치과보존학회 2007 Restorative Dentistry & Endodontics Vol.32 No.4

전방 또는 전측방 흉수 종양 수술에서 후측방도달법

조경석,박춘근,성재훈,허필우,박춘근,백민우,김달수,강준기 대한신경외과학회 1997 Journal of Korean neurosurgical society Vol.26 No.5

상아질 접착제의 용매 증발이 접착 효율에 미치는 영향

조민우,김지연,김덕수,최경규 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.5

연구목적: 본 연구는 상아질 접착제의 잔류 용매가 접착 효율에 미치는 영향을 평가하고자 하였다. 연구 재료 및 방법: 본 연구에서는 5세대 2단계 산부식형 접착제와 7세대 단일과정 자가부식형 접착제를 사용하였다. 상아질 접착제의 증발률과 전환률, 적용 후 용매의 공기건조 방법에 따른 미세인장결합강도를 측정하였으며 접착 계면을 FE-SEM을 이용하여 관찰하였다. 결과: 1. 시간에 따라 접착제의 증발률은 증가하나 접착제의 종류에 따라 증가 양상이 서로 달랐다. 2. 대부분 전환률은 증발률에 비례하는 경향을 나타내었다. 3. 공기건조 방법에 따라 결합강도는 대부분 under군, control군, over군 순으로 증가하는 양상을 나타내었다. 4. FE-SEM에서 아세톤을 용매로 사용하는 접착제는 공기건조 방법에 따라 droplet이나 gap이 관찰되었다. 결론: 상아질 접착제의 잔류 용매는 접착 효율에 부정적인 영향을 미치기 때문에, 상아질 접착제의 선택과 사용 시 용매의 종류와 특징에 대한 적절한 이해가 필요할 것이다. Objectives: The purpose of this study is to evaluate bonding efficacy by means of measuring the effect of remained solvent on Degree of conversion(DC) and μTBS and FE-SEM examination. Materials and Methods: Two 2-step total etching adhesives and two single-step self etching adhesives were used in this study. First, volume weight loss of 4 dentin adhesives were measured using weighting machine in process of time in normal conditions and calculate degree of evaporation (DE). Reaction/reference intensity ratio were measured using micro-Raman spectroscopy and calculate DC according to DE. Then 2 experimental groups were prepared according to air-drying methods (under, over) and control group was prepared to manufacturer's instruction. Total 12 groups were evaluated by means of micro tensile bond strength and FE-SEM examination. Results: Degree of evaporation (DE) was increased as time elapsed but different features were observed according to the kind of solvents. Acetone based adhesive showed higher DE than ethanol and butanol based adhesive. Degree of conversion (DC) was increased according to DE except for S³ bond. In μTBS evaluation, bond strength was increased by additional air-drying. Large gaps and droplets were observed in acetone based adhesives by FE-SEM pictures. Conclusions: Additional air-drying is recommended for single-step self etching adhesive but careful consideration is required for 2-step total etching adhesive because of oxygen inhibition layer. Evaporation method is carefully chose and applied according to the solvent type.

기본 모드에서 동작하는 비동기 순차 회로의 시험 벡터 생성

趙庚衍,李宰勳,閔炯福 성균관대학교 1998 학술회의지원논문목록집 Vol.1998 No.-

비동기 순차 회로에 대한 시험 벡터를 생성하는 문제는 매우 어려운 문제로 남아 있다. 현재까지 이 문제 에 대한 알고리즘은 거의 없었다. 그리고, 기존의 접근 방식은 시험 벡터를 생성하는 동안에는 피이드백 루프를 절단하여 그 곳에 플립플롭이 있는 것처럼 가정하고 시험 벡터를 생성하는 방식이었다. 그래서, 기존의 알고리즘은 동기 순차 회로용 시험 벡터 생성 알고리즘과 매우 유사하였다. 이것은 시험 벡터를 생성할 때에는 비동기 순차회로를 동기 순차 회로로 가정하고 시험 벡터를 생성한다는 것을 의미한다. 그러므로, 생성된 시험 벡터가 비동기 순차 회로에 적용되었을 때, 대상 결함을 검출하지 못할 수도 있다는 것을 나타낸다. 본 논문에서는 비동기 순차 회로에 대한 시험 벡터를 생성할 수 있는 알고리즘을 제시하였다. 본 논문에서 제안된 알고리즘을 적용하여 생성된 시험 벡터는 임계레이스(critical race) 문제와 순환(oscillation) 문제의 발생을 최소로 하면서 비동기 순차 회로의 결함을 검출할 수 있다. 그리고, 본 논문에서 제안된 알고리즘을 적용하여 생성된 시험 벡터는 비동기 순차 회로에 대해서 대상 결함을 검출하는 것이 보장된다. Generating test patterns for asynchronous sequential circuits remains to be a very difficult problem. There are few algorithms for this problem, and previous works cut feedback loops, and insert synchronous flip-flops in the feedback loops during ATPG. The conventional algorithms are similar to the algorithms for synchronous sequential circuits. This means that the conventional algorithms generate test patterns by modeling asynchronous sequential circuits as synchronous sequential circuits. So, test patterns generated by those algorithms may not detect target faults when the test patterns are applied to the asynchronous sequential circuit under test. In this paper an algorithm is presented to generate test patterns for asynchronous squential circuits. Test patterns generated by the algorithm can detect tasget faults for asynchronous sequential circuits with the minimal possibility of critical race problem and oscillation. And it is guaranteed that the test patterns generated by the algorithm will detect taraet faults.

폴리에스테르 섬유 감량시스템용 프로세서 타이트레이터 개발

조진호,이흥락,이종현,김명남,구성모,김무영,진경찬,유병희,강민수,김국진 경북대학교 센서기술연구소 1993 연차보고서 Vol.1993 No.-

폴리에스테르 섬유 감량시스템의 제어를 위해서는 처리조 내에서 감량되는 섬유가 목표 감량치에 도달했는지를 판단해 주는 장치가 필요하다. 본 연구에서는 가성소다용액의 초농도 및 섬유 감량 정도의 정확한 측정과 감량 종료시간의 산출 및 이에 따른 종료신호를 발생할 수 있는 폴리에스테르 섬유 감량기 전용의 자동적정장치를 개발하였다. To control caustic soda treatment system for the polyester fabric reduction, we need the device to determine that the fabric has been arrived target reduction value. In this study, we develope an automatic process titrator for the caustic soda treatment system. Major functions of the target titrating system are accurate measurements of the caustic soda concentration and then producing the end point signal for caustic soda treatment system.

금속광산 폐석 빛 폐재의 활용을 위한 특성 연구

민경원,진호일,최성범,조현순 강원대학교 석재복합신소재제품연구센터 1998 석재연 논문집 Vol.3 No.-

이 연구는 상동광산 주변에 적치되어 있는 폐석과 폐재 자원을 부가가치가 높은 건설자재와 새로운 건설소재 및 첨단산업소재로 활용하기 위하여 폐석 및 폐재에 대한 암석학적 및 물리적·화학적 특성을 규명하고자 하였다. 상동광산 주변의 폐석은 주로 석회암과 셰일, 호온펠스 등이며, 폐재적치장에 쌓여 있는 폐재는 주로 석영과 정장석, 각섬석, 백운모 등의 광물로서, 구폐재 적치장의 폐재가 신폐재 적치장의 폐재보다 약간 더 조립질이고 알카리성을 나타내었다. 폐재의 주성분 원소중 MgO 함량은 신폐재에서, P₂O5는 구폐재에서 각각 뚜렷하게 더 높은 값을 보여 주었으며, 질산과 과염소산의 혼합산에 의한 부분분해에 의해 Al₂O₃, Fe₂O₃(T), MnO, MgO, K₂O, Na₂O 등은 비교적 많은 함량이 추출되었으나, TiO₂, CaO, P₂O5 등은 거의 부분 추출되지 않았다. 폐재의 pH가 증가할수록 Fe₂O₃(T)는 감소하는 경향을 나타내었고, 작열감량(L.O.I.)은 CaO와는 높은 양의 상관관계, SiO₂와는 높은 음의 상관관계를 보여 주었다. The purpose of this study is to determine the petrographic, physical and chemical characteristics of waste rock and sludges around Sangdong mine in order to utilize them as new and high quality construction materials. The waste rocks piled around Sangdong mine are mainly composed of limestone, shale and hornfels, and the sludges in sludge-piles are mainly composed of quartz, orthoclase, amphiboles and muscovite. The sludges in old sludge-piles show a tendency of coarse grains and alkaline than those in new sludge-piles. The sludges of new sludge-piles contain significantly higher abundances of MgO, and those of old sludge-piles show significantly higher content of P₂O5. In consideration of total extraction contents for sludges, the partially extracted contents of Al₂O₃, Fe₂O₃(T), MnO, MgO, K₂O and Na₂O by mixing acid of nitric and perchloric acid, are relatively high, and those of TiO₂, CaO and P₂O5 are very low. According as pH increases, abundance of Fe₂O₃(T) in the sludges of Sangdong mine decreases. L.O.I.(loss on ignition) shows highly positive and negative correlations with CaO, and SiO₃, respectively.

개정 학교급식제도와 식중독 예방 : 운영방식 중심으로

백민경;조태제;엄애선 한양대학교 2007 韓國 生活 科學 硏究 Vol.27 No.1

School lunch program provides both health and education service. School lunch program targets on properly educating students which requires both safety and sanitation, and regulations and methods should be ready in order to prevent foodborne disease. But there are many weak points which current School Lunch Act can be used as a mean to prevent many sanitary problems. In order to settle school lunch program safely, programs must alleviate direct management in law and reduce responsibility of parents’ of the cost. In other side, preventing re-occurrence of similar foodborne disease is needed by detecting and improving all problems every step after the accident take place.

척수로 전이된 후두엽 다형성 교아세포종 : 증례보고 A Case Report

윤상민,송재욱,이창훈,조경자,김종현,이승훈 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.3

The tendency of glioblastoma to metastasize to the cerebrospinal fluid(CSF) is well documented, reaching approximately 20% in autopsy series. Nevertheless, clinical symptoms from spinal seeding seem to be infrequent or are at least rarely diagnosed. The authors report a case of 41-year old female patient with a cerebral glioblastoma multiform who developed paraplegia due to a pathologically confirmed spinal matastasis.

철골 구조설계 공정 표준화를 위한 CIS/2 AAM 모델 연구

한경민,조수제,박성수 釜山大學校 都市問題硏究所 1999 都市硏究報 Vol.8 No.-

The aim of this research is analysing CIS/2 AAM model fot investigating the Steel Framework Process Data Modeling Standards. This paper introduces CIS/2 AAM model and LPM/5 which is produced by CIMSteel project. and produces it's STEP Part 21 File Translator for exchanging building data, The overall objective of this paper is to analysis LPM/5 Logical Product Model and to evaluate File Read/write Translater. The results of this paper are as follow; 1) The study on CIS/2 is helpful to developing dominant Steel Framework Process Model 2) It may be basis of developing analysis application, which is based on STEP modelling technique.