쇼트피닝가공한 평기어의 최적 피닝강도 탐색에 관한 연구

이동선,이국진,김태형,정성균 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

The shot peening process is often used to improve fatigue properties of metal parts. Among them, It is the most use in an auto-component. In order to achieve optimum, repeatable and reliable fatigue enhancement from the shot peening process, the important shot peening parameters must be controlled. In this paper, the optimum peening intensity (Almen intensity) condition is investigated by experiment..The Spur Gear steel was used to investigate shot peening effects. The fatigue life at σ_(a)=1,050 and σ_(a)=1,250MPa first gently increases, then drops gently as peening intensity increases compared with unpeened specimen. Experimental results show that the optimum peening intensity range is 0.391~0.434mmA..So the fatigue strength and fatigue life have been tremendously increased by optimum-peening treatment. However, the fatigue strength and fatigue life have been decreased by over peeing.

구치부 반대교합의 조기치료에 대한 치험례

이은미,강동균,김태완,김영진,남순현,김현정 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.2

구치부 반대교합은 유치열기와 혼합치열기에서 종종 나타나는 부정교합으로서,유병율은 7∼23%로 다양하게 나타난다. 이는 상악 치아의 협측 교두가 대합되는 하악 치아의 협측 교두의 설측에 교합하는 상태이며,하나의 치아 또는 한 치아군에서 나타날 수 있다. 구치부 반대교합의 경우, 보통 자발적 교정이 이루어지지 않으므로, 발견되는 즉시 치료해주는 것이 추천된다. 치성이나 기능성의 경우 성장함에 따라 골격성으로 이행하여 악골의 변형을 초래하고 교정적인 수단으로 개선이 불가능한 상태로 악화될 가능성도 있으므로 조기에 치료하는 것이 효과적이며,이러한 반대교합의 치료 방법으로는 하악의 변위를 유발하는 조기접촉을 제거하기 위한 교합조정,협소한 상악궁의 확장,치열궁내 비대칭을 치료하기 위한 개개 치아의 배열 등의 방법이 있다. 본 증례에서는 유치열기와 초기 혼합치열기 아동에서 구치부 반대교합이 관찰되어 치아의 선택적 삭제와 상악궁의 확장으로 반대교합을 교정한 후 정기적 검진시 양호한 결과가 관찰되기에 이를 보고하는 바이다. Posterior cross-bite is a relatively frequent malocclusion in primary and early mixed dentition and the reported prevalence of posterior cross-bite varies from 7% to 23%. It has been defined as a transverse discrepancy in arch relationship which the palatal cusp of the upper posterior teeth do not occlude in the central fossa of the opposing lower teeth, and can be manifested in a single tooth or in a group of teeth. Posterior cross-bite does not often self-correct and therefore immediate treatment is recommended. Occlusal adjustment to eliminate premature contact that causes mandibular deviation, expansion of narrow maxillary arch, arrangement of the individual teeth to treat asymmetry within the dental arch are the methods of treating cross-bite. In the present case, functional posterior cross-bite was observed in the primary and the early mixed dentition children. The children were treated by the slow maxillary expansion and occlusal adjustment. The outcome of periodic examinations after the correction of cross-bite was favorable.

얼굴 감지기반의 운전자 졸음 방지 시스템에서 영상 크기의 영향 분석

백 태 균1, 이 상 록2 신한대학교 2023 신한대학교 논문집 Vol.46 No.-

This paper analyze the system performance according to the image size at a driver drowsiness prevention system based on face detection. The driver’s face detection is performed using the Python Dlib library based on machine-learning. This system records a video with Full HD resolution and then adjusts the image size to the 4 types of resolution. And it applies HOG and linear SVM to detect the face area, and adopts the EAR criteria to determine driver’s drowsiness. The factors of performance evaluation are an average FPS and detection accuracy, and the performance is compared and analyzed according to 4 types of resolution. As a result of experimenting by applying the system on Raspberry Pi 4, it is possible to secure over 90% accuracy even at SD360 resolution. The average FPS of SD360 resolution is 20.44, which is more than 3 times improved compared to HD resolution. As a result, it is confirmed that it is possible to implement a real-time driver drowsiness prevention system based on face detection even with SD360 resolution of 640*360 size.

미세가공기술을 이용한 Interdigitated Array 전극의 제작 및 응용

이강신,김태한,김승렬,신민철,이원용,박제균 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

Interdigitated array (IDA) electrodes were fabricated using silicon technology for highly sensitive biosensing. Thin-film platinum and gold IDA electrodes were fabricated with 10 μm band width and 7 μm gap between the bands using photolithographic techniques. The IDA electrode has 100 fingers consisting of 50 finger anodes and 50 finger cathodes. By applying both the oxidation and the reduction potentials of a reversible redox couple, ferrocyanide, to the pairs of the IDA electrode, an increased current generation can be observed. In our experiment, the collection efficiency of IDA electrode was 46% and amplification factor was 12.6. This preliminary experiment implies that the IDA electrode could be applied to biosensor fabrications as the sensitive electrochemical transducer when a lower detection limit is needed such as phenol sensor for drinking water analysis.

甘草湯의 Human Immunodeficiency Virus-1 抑制能에 관한 硏究

이태균,文濬典 東國大學校韓醫學硏究所 1992 東國韓醫學硏究所論文集 Vol.1 No.-

The microculture XTT antiviral assay method is used quantitate HIV-1 induced cytopathic effects as modulated by test substances. This relatively simple assay facilitated the safe and rapid determination of in vitro antiviral activity of selected chemicals as well as direct cytotoxicity. This experiment also confirmed that this system measures infection and subsequent viral replica-tion in target cells and XTT formazan formations correlated with the accumulation of extracellular virions, as measured by quantitative HIV-1 induced syncytium formation. The present results with Glycyrrhizin using this in vitro culture system demonstrated that effective dose EC50(the concentration at which increase XTT formazan production in infected culture to 50% of that in untreated, uninfected controls) was 250g/ml. As comparison, AZT was included in this experiment and demonstrated that EC50 AZT of was 0.05g/ml, approximately 5,000 times more potent than Glycyrrhizin based on EC50 ratio's alone. However, this potency is limited by severe cytotoxicity of AZT, while Glycyrrhizin is approxima-tely 16 times less toxic(IC50 of Glycyrrhizzn 800 and AZT 51g/ml). While AZT's anti-HIV-1 viral activity os mediated by inhibition of reverse transcriptase. Further study is necessary in order to understand the precise mechanisms of Glycyrrhizin action against HIV-1 viruses. Althouth Glycyrrhizin is less effective antiviral agent than AZT. much less toxicity of Glycyrrhizin is desirable in terms of chronic treatment. Combination treatment of AZT and Glycyrrhizin may be therapeutically beneficial. Clinical effectiveness of two drug combination treatment of AZT patient is unknown at this time. However, this experimental investigation presents the scientific rational basis for such therapeutic approach.

內膜1號丸 子宮內膜症 白鼠의 治療效果에 對한 硏究

권은정,배한익,이태균 동국대학교 경주대학 1996 東國論集 Vol.15 No.-

Endometriosis is characterized by ectopic growth of tissue resembling endometriosis in various extrauterine locations. So we surgically implanted endometrial tissue to serosal wall of small intestine in rats. After that we administrated Naemak-1-ho-hwan for 10, 20, 40, 60, 80, 100 days. The results were as follows: 1. After 4weeks we could observe tissue resembling endometrium in serosal wall of small intestine. Endometrial tissue which was located serosal wall of intestine had the function of growing, secreting and bleeding. 2. The size of the endometrial tissue in the Naemak-1-ho-hwan administrated group was significantly reduced when we compared with water administrated group (control group) . Further more, as the time goes on, the effect of Naemak-1-ho-hwan much better. 3. In case of infected group, we could find abscess and fibriotic change, also like that case Naemak-1-ho-hwan was not effect. 4. There was no difference between Naemak-1-ho-hwan administrated group and control group in the shape of primordial follicle, primary follicle, maturing primary follicle and ovary size. So these results suggest that Naemak-1-ho-hwan will be effect for the patient who suffer from slight endometriosis.

대전·충남지역 와병노인의 실태에 관한 연구

이동배,심운택,이태용,오장균,정성훈 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.1

This study was conducted to investigate the prevalence rate and the relationship between causative diseases and self-help abilities in bed ridden patients of the elderly. The study group was composed of 1.568 peoples aged 65 or more, living in Taejeon city and Chungnam provincial area. The results obtained were as follows : 1. The prevalence rate of bed ridden patients were 5.7% in male, and 4.3% in female. The rates revealed increasing basis with the ages. 2. The prevalence rate was higher in city area with 6.1% than inland and seaside area with 4.3%, 3.7% respectively. 3. The mean age of bed ridden patients were 75.9 years in male. 78. 0 years in female. The rates were variable with residential area. As the cause of bed ridden patients the cerebrovascular disease was higher in urban than rural area. 4. The mean age of causative diseases was the highest in contusion and fracture with 82.8 years. The period of bed ridding was the highest in muscular disease and arthropathy with 60.2 monthes. 5. The average score of activity of daily living was the highest in muscular disease and arthropathy and followed by respiratory disease, other disease, senility, cerebrovascular disease, contusion and fracture with decreasing basis. But most bed ridden patients did the activity of daily living similar to those of normal persons. 6. The causative diseases were diagnosed mainly in general hospital, hospital. and herb medicine. but muscular disease and senility were in self-diagnosed. 7. The helper of bed ridden patients were mainly wives or daughters in law.

[논문]ZCS를 이용한 간단한 long pulse CO2 레이저 전원

김태균,이임근,김희제 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-

30Torr 이하 저압 공진기에서 ms order의 long pulse duration을 가진 간단한 펄스 CO2 레이저를 구현하였다. 레이저 시스템의 새로운 전원은 직접 상용전원을 스위칭한다. 이 새로운 전원의 방전 회로에는 정류기, 축전용 커패시터, 또는 전류 제한용 저항이 필요하지 않다. 레이저 출력을 제어하기 위해 펄스 반복률을 최대 60Hz까지 조절했고,SCR의 스위칭각은 30°에서 150°까지 변화시켰다. ZCS circuit과 PIC one-chip microprocessor는 SCR 게이트 신호를 제어하기 위해서 사용되었다. 18 Torr 압력,60Hz 의 펄스 반복률,SCR 스위칭각 90°에서 최대 레이저 출력 35 W를 얻었다. 또한 다른 CO2 레이저와 비교해서 long 펄스를 얻을 수 있었고 이는 대략 3ms(FWHM) 였다.

한국 민간경비 마케팅 전략 수립방안

이상철,김상균,김태복 龍仁大學校 2008 용인대학교 논문집 Vol.26 No.-

Korea's private security services has been successful in its growth in size, though research on qualities and competition has been stagnated. Also, the subject lacks the expertise, finances, and the technics causing dissatisfactions from the customers. Therefore, private security service companies are in great needs of diverse marketing strategies to fulfill the satisfaction of the customer, such strategies are providing an education for employers, or restructuring company, and for the last, benchmark more advanced companies. This research shows diverse strategies by using "SWOT" method, analyzing the inner and outer environment of the market, also setting the result of the analysis as a basis, establishing "STP" strategy that subdivides the market, and after choosing the objective market, customer who devise marketing mix strategy, and product oriented marketing strategy were provided, to satisfy the customers. When the companies product weren't selected by the customers, there has to be a reason. Before showing customers the product, people who are in security business should think what would the customers want, what would they like, what would they think, what would they dislike first. Company should be able to answer these questions, and the To be successful on customers and product oriented marketing activities, when meeting with customers, company should be more convenient, and also focusing on elevating the qualities of the services. Private security business could categorize as service, therefore securing structure, or securing civilians could define as products. To increase the qualities of the product, there has to be more veterans. to solve this problem, there has to be industrial, and educational supports, also through detailed analysis, company should set the standard price for the service, so that it would prevent the dumping of the price. When dealing with distribution and acceleration, security industry transact customers directly so that there might be some difficulties when employees don't have the right etiquettes around customers. Therefore educating employees on manners, as well as the work that employees assigned to do, will help companies to get close to the customers much easier. Company should be using online marketing, enables the company to respond to the customers man to man, accumulate potential customers for the future references.

트리 정합에 의한 서명 검증 연구

이영호,김태균 충남대학교 1992 論文集 Vol.15 No.1

This paper describes a method of On-Line signature verification based on an acceleration waveform varying with time during writing of signature. Dynamic characteristics of acceleration waveform is represented by a tree after preprocessing, pattern description process. Proposed pattern description consists of level quantization, extraction of crossing point, node generation and search steps of node path. Tree is used for hierarchical representation of peak, valley, relative magnitude of signature waveform. A tree matching technique is used to calculate the similarity between the two signature patterns.