Structural Modification in Proton-Irradiated Highly-Oriented Pyrolytic Graphite

이규원,이철의 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6

We have made a comprehensive study on the structural changes in highly-oriented pyrolytic graphite (HOPG) samples irradiated with 2.25-MeV proton beams. X-ray photoelectron spectroscopy showed a surface polishing effect and a graphite-to-diamond surface structural transformation, followed by regraphitization of the diamond-like surface as the proton irradiation dose was increased from 1015 ions/cm2 to 2×1017 ions/cm2. While the surface showed prominent changes at relatively small irradiation doses, the bulk region of the HOPG, as probed by Raman spectroscopy, manifested creation of defects only at the maximum dose employed, for which ferromagnetism takes place.

국내 이중편파레이더의 활용

이규원,권수현,이충기,남경엽,Lee, Gyu-Won,Gwon, Su-Hyeon,Lee, Chung-Gi,Nam, Gyeong-Yeop 한국수자원학회 2012 물과 미래(한국수자원학회지) Vol.45 No.8

彈性理論에 依한 I型鋼 Beam의 最適設計에 關한 硏究

李奎遠 전북대학교 공업기술연구소 1976 工學硏究 Vol.5 No.-

This paper covers with following terms Ⅰ) The objective function of the nonlinear p개gramming formulation for minimum weight design is derived by the relation between area and moment of inertia, and this nonlinear objective function is transformed into the Lagrange funtion by the Lagrange multipliers. After design variables H, Af, Tw are resolved by necessary condition of this Lagrange function, whether this values are satisfying optimum points or not, is included in this paper. Ⅱ) Optimum solutions are resolved from the three case of stress control design, deflection control design and full constrained design.

小兒精神科 外來患者에 關한 考察

李揆媛 大韓神經精神醫學會 1971 신경정신의학 Vol.10 No.1

In view of the absence of any systematic study of the psychiatric disorders among the children in this country, the author reviewed 100 child psychiatry out patients seen in her practice at the Catholic Medical Center during the past one year. And the findings were compared with those of A.A.P.C.C. and N.I.M.H. reported in Children and Clinics, 1968. In table 1, one can observe that 2/3 of 100 children, were referred to the author by the physicians and the rest, 1/3, brought directly by the parents. Table 2 and 3 show the comparison of this study with the reports of N.I.M.H. and A.A.P.C.C. respectively. The differences were observed in the age groups of both preschool and adolescence in that the age distribution of this study is higher in preschool ages and lower in adolescence in comparison to those of American patients(This finding can be explained on the basis of the differences also observed in the distribution of diagnostis categories). It is of interest to see that in all three studies, the majority (70%∼80%) of the total cases fall into the age group of school children before adolescence. In order to make a valid comparison in the light of confusion in nosologic system., the comparison of diagnostic distribution was made only with. A.A.P.C.C. findings, considering the author's training and working background with A.A.P.C.C. in the past. As shown in Table 4, the findings of this study are characterized by, 1) lower incidence(9%) in transient situational disturbances, 2) higher incidence in brain syndrome and mental retardation, and 3) no case of psychophysiologic disorders 1) and 2) explain the difference in age distribution mentioned above, in view of the fact that adjustment reaction of adolescence is included in the diagnostic category of transient situational disturbances and the fact that obvious cases of mental retardation and brain syndrome can be detected at the earlier ages. The author's total clinical experience including inpatient consultation during the past one and one half year supports the third point; she has not so far seen any case of psychophysiologic disorder. Dr. Hahn of Seoul National University also comments on the absence of such psychophysiologic disorders as mucous or ulcerative colitis among the adult patients in this culture. The number of the cases dealt with in this study is too small to allow the comparison with the reports of N.I.M.H. and A.A.P.C.C.; nevertheless, the author has presented this study in an attempt to mark a biginning.

스톰의 연직 구조 : 미세물리과정에 대한 정보

이규원 한국기상학회 2010 한국기상학회 학술대회 논문집 Vol.2010 No.10

多制約條件을 考慮한 P.C橋의 最適設計에 關한 硏究

李奎遠,崔鎔星,李根泰 전북대학교 공업기술연구소 1989 工學硏究 Vol.20 No.-

學籍管理電算化에 關한 硏究

이규원,이중열,김진성 全北大學校 1983 論文集 Vol.25 No.-

The purpose of this thesis is to design and to analyze a way of utilizing a system very helpful for the effective administration of school registration management by using the HP-3000 computer system at the computer center of Jeonbug National University. The object of business management through computerization is as follows : to issue a graduation certificate and an enrollment certificate, to manage swiftly and accurately the change of a student's school registration (temporary absence and reinstatement) and to develop a program for the calculation of numbers of enrolled students as well as temporarily absent student in each grade, department and college. Incidentally, the business management of student's record is not covered by this thesis. KSAM(Keyed Sequential Access Method) was used for the design of an effective system, and consequently while the retrieval time could be shortened, move disc space was demanded in proportion to the size of SAM(Sequential Access Method) file.

증강 현실을 이용한 차량 정비 시스템의 구현

이규원 대한산업공학회 2005 대한산업공학회 추계학술대회논문집 Vol.2005 No.-

Antiferromagnetic edge states in carbon nanotubes with hydrogen line defect abundancy

이규원,이철의 한국물리학회 2015 Current Applied Physics Vol.15 No.3

We have investigated the antiferromagnetic edge states in carbon nanotubes with hydrogen line defects by using the density functional theory calculations. As the hydrogen line defects increase, the exchange energy gain stabilizing the antiferromagnetic edge states increases in each graphenic ribbon produced by the line defects, indicating that the antiferromagnetic edge states can be realized at high temperatures regardless of the nanotube size. The exchange energy gain in each ribbon is determined by the ribbon width of the flat ribbon and apparently by the curvature of the curved ribbon. The exchange interaction between the ribbons is seen to be negligibly small even in the presence of a nonmagnetic inter-ribbon interaction that is sensitive to the ribbon width.

Relationship Between Depression Anxiety Stress Scale(DASS) and Urinary Hydroxyproline and Proline Concentrations in Hospital Workers

이규원,김수정,박재범,이경종 대한예방의학회 2011 예방의학회지 Vol.44 No.1

Objectives: Although increased reactive oxygen species (ROS) is caused by stress accelerates collagen degradation,there was no data on the relationship between stress and urinary hydroxyproline (Hyp) and proline (Pro), a good marker of collagen degradation. The purpose of this study was to evaluate the relationship between depression, anxiety, and stress (DAS) and concentrations of urinary Hyp and Pro. Methods: 97 hospital employees aged 20 to 58 were asked to fill out comprehensive self-administrated questionnaires containing information about their medical history, lifestyle, length of the work year, shit-work and DAS. Depression Anxiety Stress Scale (DASS) was applied to evaluate chronic mental disorders. Urine samples were analyzed using High Performance Liquid Chromatography (HPLC) with double derivatization for the assay of hydroxyproline and proline. Results: The mean value of Hyp and Pro concenturation in all subjects was 194.1±113.4 μmol/g and 568.2±310.7μmol/g. DASS values and urinary Pro concentrations were differentiated by sex (female > male, p < 0.05) and type of job (nurse > others, p < 0.05). In the stepwise multiple linear regressions, urinary Hyp and Pro concentrations were influenced by stress (Adjusted r2 = 0.051) and anxiety and job (Adjusted r2 = 0.199), respectively. Conclusions: We found that stress and anxiety were correlated with urinary Hyp and Pro concentrations. To identifying a definite correlation, further study in large populations will be needed.