내압 및 수직하중 작용시 Radial Tire Sidewall부 변형의 시간에 따른 변화 연구

성경진,박인정,유현승,김두만 한국 항공대학교 항공산업기술연구소 2001 航空宇宙産業技術硏究所 硏究誌 Vol.11 No.-

본 연구에서는 타이어 sidewall부에 대한 내압 및 수직하중 그리고 시간에 따른 변형율 변화를 strain gage를 사용하여 측정하였다. 결과적으로 타이어에 최초 내압 작용 후 24시간이 지나면서 타이어의 strain 값이 안정되는 것을 확인하였으며 수직하중에 대한 실험 수행 시 1시간 이상 지난 후에 측정해야 하중작용 실험의 영향이 나타나지 않는 것을 확인하였다. 이로서 Strain gage를 이용한 실험 및 해석의 기반을 마련하였다. In this paper, variation of the strain on the radial tire sidewall with inflation pressure and vertical loading has been measured with respect to the time by experiment of method. As a result, the strain was stable after 24 hours, and vertical loading test must be done after I hour later from the prior loading test. The experiment was conducted to verify the deformation behavior experiment analyze method using strain gage. So the basis for the experiment and analysis of sidewall strain was established.

폐경 전후 여성의 식이섭취가 골 밀도에 미치는 여향

홍성철,김문두,김성엽 제주대학교 생명과학연구소 2003 제주생명과학연구 Vol.6 No.1

Objective : To evaluate degree of bone mineral density and prevalence rate of osteoporosis according to age and to search the preventive strategy for osteoporosis, the factors that affect on bone density were studied in pre- and postmenopausal women in korea. Methods : The subjects were 961 premenopausal and 1,167 postmenopausal women who have examined in health promotion center of Yeungnam University Hospital in Daegu city from January, 1999 to January, 2001. The diet pattern of subjectives was analysed through interview with questionnaire. Results : The bone mineral density was statistically higher in women who have taken more calorie, protein, fat, or carbohydrate than recommended amount compared with women who have taken less calorie, protein, fat, or carbohydrate, than recommended amount in pre- and postmenopausal. In the effects of mineral and vitamin intake on bone mineral density, the higher intake of vitamin B12 and niacin increased bone mineral density statistically significantly in postmenopausal women, the women who have taken calcium more than 500 mg/day were revealed increased bone mineral density compared with less intake women in pre- and postmenopausal, and the women who have taken vitamin C more than 100 mg/day were revealed increased bone mineral density compared with less intake women in pre- and postmenopausal. Conclusion : These results suggested that to prevent osteoporosis, the systemized program including balanced diet for promoting anti-osteoporotic factors have to be developed and apply from the thirties whom have maximal bone mineral density.

MUSIC 알고리즘을 이용한 적응 빔 성형에 관한 연구

문성익,이광식,양두영 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.1

In order to estimate DOA(Direction Of Arrival) of signal, the adaptive beam forming algorithm based on MUSIC(Multiple Signal Classification) is studied and analyzed. The eigenvalues for the signal component and the noise component are obtained from correlation matrix of the received signal by array antenna. The eigenvalues classified the signal components into the noise components decide the power spectrum of the received signal. From the results, DOA is estimated by the signal and noise spatial vector, and the steering beam pattern is found by weight vectors calculated from the spatial vector, effectively.

전라남도 해남군 일대의 산림 조류상

이두표,김성현 호남대학교 2005 호남대학교 학술논문집 Vol.26 No.2

To elucidate the present forest avifauna of Haenam county, bird censuses were conducted at Mt. Gumgang, Mt. Jujak, and Mt, Dalma from April to July, 2004. A total of 35 bird species was recorded. Among them, 33 species were estimated prospective breeding species. Dominant species in this area were Paradoxornis webbiana, Passer montanus, Hirundo rustica, and Hypsipetes amaurotis. The special protected birds listed by Mnistry of Emviroment were five species: Otus scops, Alcedo atthis, Picus canus, Halcyon pileata and Oriolus chinensis.

분산 데이타베이스 설계를 위한 데이터 분할 방법론

박성진,백두권 한국경영과학회 1994 한국경영과학회 학술대회논문집 Vol.- No.2

최근들어 분산 데이터베이스 시스템에 관한 연구가 연구 목적뿐만 아니라 실질적인 응용 분야에서도 급속히 증가하고 있다. 한편, 분산 데이터베이스 시스템에서 데이터 분할은 주요한 설계 이슈중의 하나이다. 비록 데이터 단편화 설계에 관한 많은 연구가 진행되었지만 기존 연구의 대부분은 일시적인 해결책이나 특별한 경우에 대한 일반적인 해결책에 그치고 있으며 단순히 수평 혹은 수직 분할 방법론만을 선택적으로 적용하고 있다. 본 논문에서는 혼합 단편화에 기반한 분할 방법론을 제안하였다. 제안한 방법론은 후보 단편들을 생성하고 데이터 할당과 중복을 위한 최적의 단위를 제공한다.

演算 增幅器를 利用한 2階 RC 能動 濾波回路의 設計에 關하여

郭勳星,李斗秀,金定德 全北大學校 1978 論文集 Vol.20 No.-

State variable technique was introduced to realize active filters which have arbitrarily and independently assigned poles and zeros in the s-plane with the exception of poles at the origin. The networks designed by the state variable technique have a great deal of advantages but ideal active elements have been used for the design. This is not practical. In this paper, a method of design of active filters by state variable technique is introduced by using practical active elements. The active filters owing to this method have been proved experimentally to have a little more stable characteristics on high quality factor.

지구성 운동과 철분투여 효과

위승두,서영환,나승희 조선대학교 스포츠과학연구소 2001 스포츠科學硏究 Vol.12 No.-

初等學敎施設의 色彩計劃 合理化 試論 : 6개 新築學敎에 대한 문-스펜서 色彩調和와 PCCS 色調調和에 바탕하여 Based on Moon & Spencer and PCCS Harmonization Theory

張聖浚,崔斗源,黃仁煥 대한건축학회 2003 대한건축학회논문집 Vol.19 No.12

The study deals with color environment of some new primary school buildings to suggest alternative strategy for rationalization of color planning. We introduced two analytic methods. Firstly, we measured present color schemes in and outside the building, and checked if the colors satisfy theory of harmony suggested by Moon & Spencer, and PCCS. Secondly, we conducted enquete survey to find out preference on color samples and satisfaction on color environment of the new building. In case of exterior colors, half of them were in disharmony in respect to main color. The respondents presented conflict attitude in color combination preference in the color sample and the real color environment. The study suggests appropriate strategy for color planning to promote color satisfaction; .enhancement of harmony condition, simple checking of harmony between primary color and secondary or accent color, cheking of bipolar attitude, care of color maintenance.

마이크로프로세서를 利用한 디지탈필터의 特性 改善

郭勳星,李斗秀,金定德 全北大學校 1980 論文集 Vol.22 No.-

This paper introduces a technique for implementing a second order recursive digital filter. The realization is based on the residue number system and sequentially multiplexing two look-up tables which are used for the operations of addition and multiplication. The data rate of the filter implemented with microprocessor is improved under some assumption.

骨格筋 Protein Methylase Ⅱ에 關한 硏究

洪承元,郭相太,林圭,黃炳斗 충남대학교 의과대학 지역사회의학연구소 1988 충남의대잡지 Vol.15 No.2

Protein methylase Ⅱ (S-adenosy-L-methionine : protein-carboxyl 0-methyltransferase) has been, purifed 6,600-fold from bovine skeletal muscle and characterized. The purification procedures involved ammonium sulfate fractionation, Sephadex G-75 chromatography, S-adenosyl-L-homocysteine-Sepharose 4B chromatography, and hydroxyapatite chromatography. The enzyme showed an optimal pH around 6.0. It was heat-labile, being inactivated by heattreatment at 60℃ for 6 minutes. However, storage of the enzyme at -20℃ in the presence of 10% glycerol prevented the activity loss for 6 months. The apparent Km for S-adenosyl-L-methionine was 2.86 × 10 exp (6) M. Copper(Cu^2+) ion was potent noncompetitive inhibitor, the activity being completely inhibited b) 0.25 mM Cu^2+ and 1 mM Zn^2+. Most of the activity loss by copper and zinc ions were recovered by the addition of ethylenediamine tetracetate. The enzyme was also completely inhibited by 0.5 mM phydroxymercuribenzoate, which could be reversed by the addition of 10 mM 2-mercaptoethanol. The molecular weight of the enzyme was 24,000, as determined by Sephadex G-75 chromatography. Histone IIA, immunoglobulin A and soybean trypsin inhibitor were efficiently carboxylmethylated by the enzyme. Sarcoplasmic reticulum(SR) and sarcolemma(SL) of the skeletal muscle were also efficiently carboxylmethylated by the enzyme at a rate of 0.96 and 0.63 pmolesl mg protein/min of 3^H-CH_3, incorporation, respectively. Polyacrylamide gel electrophoresis of the carboxylmethylated SR and SL revealed multiple carboxylmethylated subfactions : SR resolved into the subfractions with molecular weight 100,000, 55,000, 22,000 and 14, 400, and SL into the subfractions with molecular weight 48,000, 22,000 and- 14, 400. Of these subfractions those with Mr=22, 000 were most strongly carboxylmethylated. Endogenous cAMP-dependent phoshorylation of SR occurred in the subfractions with Mr=55, 000, Mr=27, 000 and Mr=~14, 400, of which the fraction with Mr=27, 000 was most strongly phosphorylated. When SR was carboxylmethylated, the endogenous cAMP-dependent phosphorylation was decreased. SR exhibited relatively high Ca^2+-ATPase activity and oxalate-facilitated ATP-dependent 45^Ca^z+uptake. The carboxylmethylation and cAMP-dependent phosphorylation of SR increased the Ca^2+TATPase activity by 15% and by 29%, respectively. However, cAMP-dependent phosphorylation of SR which had been previously carboxylmethylated led to only 23% increase in the Ca^2+-ATPase activity. Both the carboxylmethylation and cAMP-dependent phosphorylation enhanced the steady-state rate as well as the initial rate of ^45Ca^2+-uptake. Kinetic analysis showed that the apparent Km and Vmax of Ca^2+ for ATP-dependent Ca^2+-uptake were 45μM and 35 nmoles/mg protein, respectively. Both the carboxylmethylation and cAMP-dependent phosphorylation of SR decreased the Km and increased the Vmax for the Ca^2+-uptake. These results suggest that protein methylase II might have some regulatory role in the calcium transport of sarcoplasmic reticulum.