고속가공에서 2중 신경망을 이용한 표면거칠기 예측과 가공DB 구축 효율화 방안

원종률,남성호,유송민,이석우,최헌종 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

In this paper, a double artificial neural network (ANN) approach and the efficient machining database building scheme are presented for the prediction of surface roughness in high-speed machining. In this approach, 4 machining parameters and used for the prediction of cutting force components, and the combinations of 4 parameters and the predicted cutting force components are finally used for the prediction of surface roughness. The experimental results comparing the these results with the predicted values using simple 4 input nodes have been also investigated to verify the effectiveness of the proposed approach.

^(131)I 전신스캔 음성 재발 분화 갑상선암에서 EDG PET의 임상적 의의 : ^(99m)Tc-MIBi Scintigraphy와 비교분석

원종철,이성진,이태윤,남궁일성,이시열,김하영,한정희,류진숙,문대혁,안일민 대한내분비학회 2001 Endocrinology and metabolism Vol.16 No.4-5

고등학생의 성 관련 특성, 성 지식에 관한 기초 조사

김혜원,김남순,윤태호,김종숙,홍경자 관동대학교 의과대학 의과학연구소 2005 關東醫大學術誌 Vol.9 No.1

Purpose : This preliminary study was done to identify sex related characteristics and sex knowledge of high school students. Methods : 622 high school students participated in the survey living in Gangreung city area. The data collection was done from May 1st to October 31st, 2000 using the self administered questionnaires. Results : The teachers and the peer students had a critical position in high school sex education. Reproductive physiology such as relations with the opposite sex, AIDS, STI, and contraceptions should be intensified in further sex education for high school students. There were sex differences in contraception and permission with sex relationship. And the false belief regarding sex assaults and knowledge deficit in AIDS were discovered. Conclusion : Sex education program development and application are necessary based on the educational needs and attitude evaluation for the sexual health improvement of high school students. In further study, developing the reliable measurement tool and various educational methodologies will be studied which are enough for the include the sex education concepts.

흉선종 제거후에 발생한 재생 불량성 빈혈 : 증례보고

전원선,이상철,김현정,배상병,김찬규,이남수,박노진,이규택,박성규,홍대식,박희숙,원종호 순천향의학연구소 2007 Journal of Soonchunhyang Medical Science Vol.13 No.2

Thymoma is associated with myasthenia gravis, Pure red cell aplasia, and autoimmune diseases such as autoimmune hemolytic anemia, aplastic anemia, and hypogammaglobulinemia. It's association with aplastic anemia is rare and aplastic anemia appearing after surgical removal of thymoma is especially rare. The authors hereby report a case of aplastic anemia occuring in a patient who was diagnosed with thymoma and myasthenia gravis and had the tumor surgically removed. The patient was treated with anti-thymocyte globulin, cyclosporin, and prednisolone, and showed partial remission with hematologic improvements after 12 months.

RF 스퍼터링법에 의한 SCT박막의 전기적 특성

김원종,정의남,심상흥,박하용 三陟大學校 2001 論文集 Vol.34 No.1

In this study, The (Sr1-xCax)TiO3(SCT) thin films are deposited on Pt-coated electrode (Pt/TiN/SiO2/Si) using RF magnetron sputtering method with substitutional contents of Ca at various substrate temperature. The structural properties of SCT thin films are analyzed using SEM, XRD, and EDS, and the electrical properties are studied by measuring the dielectric properties and the electrical properties are studied by measuring the dielectric properties and electrical conduction. The experimental results of electrical properties are summarized as follow. The dielectric constant is increased with increasing the substitutional contents of Ca, while it is decreased if the substitutional contents Ca exceeded over 15[mol%]. The maximum dielectric constant of thin film is obtained by annealing at 600[℃]. The dielectric constant changes almost linearly in temperature ranges of -80~+90[℃]. The temperature properties of the dielectric loss have a stable value within 0.1 independent of the substitutional contents of Ca. The capacitance characteristics had a stable value within ±5[℃]. The drastic decrease of dielectric constant and increase of dielectric loss in SCT thin films is observed above 200[㎑]. All SCT thin films used in this study show the phenomena of dielectric relaxation with the increase of the increase of frequency. Ⅴ-Ⅰ characteristics of SCT thin films show the increasing leakage current with the increases of deposition temperature.

Al-Li 합금의 시효석출에 미치는 Cu, Mg 및 Zr 첨가의 영향

백승남,김종원 조선대학교 생산기술연구소 1995 生産技術硏究 Vol.17 No.2

The purpose of this study is to improve the low toughness of Al-Li binary alloy which is expected to be widely used for the structural materials of the aircraft and light industry. For the sake of improvement addition Cu, Mg and Zr were together added. The kind of shape and variation of precipitation phase formed by age precipitation in alloy with addition element and the mechanism of nucleation were closely examined. The above were carried out through investigation of the variation of mechanical properties such as tensile strength, yield strength, hardness and elongation, microstructure by TEM, and the formation and dissolution of precipitate by thermo analysis. 1. For Al-Li-Cu-Mg-Zr porynary alloy at 170℃, the strength is at the highest at 72hr aging, but elongation is at the lowest at 65hr aging. 2. There are various precipitates of δ', α', S' and T1 at 170℃ aging. It is assumed that these mixed structures have an effect on the strength and elongation in the under aging. This is attributed to multipicative mutual supplement action by coexistence of composite phase rather than δ'single phase. 3. The resurt of thermo analysis of as-quenched shows that endothermic range regarded as dissolution of G. P. zone appeared at 130℃ lower by about 70℃ than predictable on the phase diagram.

연질폴리우레탄폼의 물리적 성질 및 흡음율에 관한 연구

정종원,박남국,박선정,박종래,김영철 全南大學校 觸媒硏究所 1997 觸媒硏究 論文集 Vol.19 No.-

The effects of polyols, isocyanates. surfactants and water on the physical properties of the polyurethane foam were investigated. The resin used in this study was prepared from a variety of polyol mixtures by adding catalyst, surfactant and cross-linker. The polyurethane was foamed from the resin by adding an equivalent amount of isocyanate and was used in property measurements. The physical properties were more affected by the type of isocyanates and the amount of water than the sound absorption coefficient. The sound absorption coefficient of the polyurethane foam was superior for the polyol mixture of KE-810(40%)FA-733(40%)/FA-703(20%). The sound absorption coefficient was increased with the amount of surfactant L-5309 up to 3000Hz, but was decreased above that frequency.

압축력과 휨을 받는 Hollow Core Slab의 구조적 거동에 관한 연구

강원석,김승훈,이리형,김용남,김종수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Recently, Many engineers have used Hollow Core Slab(HCS) system on buildings. However, they couldn't apply this system to under three underground buildings, because the axial force effect hasn't yet been clearly investigated. This paper presents the test results for structural behaviors of HCS under axial and bending load. Variables are the thickness of Topping concrete and the maginitude of axial forces. The thicknesses are 100mm and l50mm. The axial forces are 0kN, 911.4kN, 1313.2kN, 1640.5kN. The results showed that HCS system has more strength capacity as the axial forces are increaser.

한국의 광물명칭에 관한 연구

정원우,상기남,이윤종,김중욱,곽기근 慶北大學校 科學敎育硏究所 2003 科學敎育硏究誌 Vol.27 No.-

The purpose of this study is to investigate historical records on Korean mineral terms. One of the earliest records on Korean mineral terms is the Donguebogam(oriental medical handbook) written by Heo Jun in 1613. Most of geological investigation of Korea was accomplished by Japanese geologists in the period of the 1900~1945. Korean mineralogical records have been described by Gottsch(1886), Kwasaki(1935), Kinosaki(1937, 1940), Tsuda(1941, 1952) and Galleger(1963). Korean mineral species have been described about 300 species by KIER(Korea Institute Energy and Resources) in 1977. In the results of this study, Comparisons and classifications between current korean mineral terms and korean traditional and chinese medical mineral terms are suggested.

유두체-시상로의 신경종말에 관한 연구

양남길,심동원,김종규,안의태 순천향대학교 1985 논문집 Vol.8 No.1

This experiment was performed to define the ultrastructural character of axon terminal of mammillothalamic tract. The rats weighing 250∼300 gm were stereotaxically lesioned in the mammillary body. 2,7 and 14 days following the lesion, animals were sacrificed and perfused with 1% glutaraldehyde-1% paraformaldehyde solution(pH 7.2∼7.4), and anterior thalamic nuclei were punched out from the successfully lesioned brain. Tissue punchings were fixed in the same fixative as perfusion liquid overnight, immersed in the 2% osmic acid (pH 7.2∼7.4), dehydrated through alhcohol series, and embedded in the Araldite mixture. Degenerated axon terminals within the anterior thalamic nucleus following the mammillary lesion show two kinds of patterns, i,e., dark degeneration and lucent degeneration. Boutons of both types were asymmetrically synapsed with dendritic spine. Some boutons were synapsed directly with dendritic body, but from the correlative serial readings they showed the impression that they were originally synapsed with the spine. The result was contrasted with the former report that the synaptic type was defined as axo-dendritic one. The evidence suggests that axon-terminals of mammillothalamic tract make asymmetric axo-spinous synapses within anterior thalamic nucleus.