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습식법으로 제조한 수산화아파타이트 분말의 소결과 그 미세구조에 미치는 Ca/P몰비의 영향
신용규,정형진,김병호 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.1
Hydroxyapatite powders were syntehsized by the reaction of Ca(NO3)2.4H2O and (NH4)2HPO4 in aqueous solution. The effect of the Ca/P mole ratio in the starting solution on the sintering of the powders and its microstructure was studied. When the Ca/P mole ratio in the starting solution was 1.69, the relative density of the sintered bodies was more than 95%. The sinterability was decreased as the Ca/P mole ratio in the starting solution was increased (Ca/P mole ratio >1.67). Hydroxyapatite sintered bodies obtained from the Ca/P mole ratio=1.69 had very excellent bending strength. The best bending strength was obtained at 110$0^{\circ}C$ and its value was 1220kg/$\textrm{cm}^2$. The average grain size was 0.277${\mu}{\textrm}{m}$. Most of sintered bodies were almost shown 100% hydroxyapatite phase. However, in case of the Ca/P mole ratio=1.64 hydroxyapatite was decomposed to $\alpha$-whitlockite above 120$0^{\circ}C$.
신용규,나철,이길홍 중앙대학교 의과대학 의과학연구소 1997 中央醫大誌 Vol.22 No.4
The present study was performed to identify the socio-psychiatric aspects of adolescent criminal offences reported on daily newspapers and to use them as basic materials for prevention of adolescent criminal offences. The author analysed 609 cases of adolescent criminal offence who reported on Dong-a Ilbo and Chung-Cheong Ilbo, from 1991 to 1995. The total numbers of cases were 609, including 573 males and 36 females. In data analysis, the subjects were devided into three subgroups as the student group(221 cases), the working group(70 cases), and the jobless group (318 cases). and the result of the study were as follows. 1. The cases of adolescent criminal offences were more common in male. Their mean ages were the youngest in the student in contrast to late subgroup of the working or the jobless. 2. The antisocial personality was the most common in the jobless, while the dramatic cluster including the borderline or masochistic personality was more prevalent in the working, and the anxious cluster was more in the student. In psycho-social stressors, the student was suffered from various stress in school, home and their social life, while the working showed more serious stress in their hetero-sexual and business life, or more experienced maladjustment in their social and job life, and the jobless group showed more stressful burden due to economical problems, or more experienced maladjustment in their family life. 3. In subtypes of criminal offences, violence, fatal assult, fatal injury, parricide, and their or group offences were more common in the student, while murder, rape and raising the penalty or solitary offences were more frequently observed in the working, and felony was the most prominent offence in the jobless. 4. The incidence of student's offences reported in daily newspapers was remarkably increased, while those of the working or the jobless were decreased. The most vulnerable time of criminal offence in adolescents was from 7-12 PM, and these trends were prominent in the jobless compared with the student in afternoon, and the working in midnight. 5. In motivation of crimes, the psychological conflicts were the most in the student, while the curiosity, the various personality problems, and the heterosexual conflicts were common in the working, and the economical problems or the absence of motivations were prominent in the jobless. 6. In the tools of crime, the sharp materials were the most ones in the student compared with the fists, knives or guns in the working, and the absence of tools in the jobless. In the methods of crime, the latent aggression or physical aggression were the most ones in the student, compared with the forced aggression or direct aggression in the working. 7. In terms of accompanied person participating in criminal offence, group offence was prevalent(60.9%). The numbers of accompanied persons were more than 4 persons in the student, compared with the 2 persons in the working group, and the 1 person in the jobless. In the age ranges of accompanied persons, the student showed the youngest, while the jobless showed the oldest ones. 8. Males(63.2%) were more common in victims of adolescent criminal offences, about 40% of victims was the absence of job, and adults older than 21 years old(34.6%) was the most prevalent, followed by children younger than 11 years old(21.8%). Most of the victims in the student were their friends, lovers or parent with minor injury, while those in the working were passengers with more serious injury. The 67.8% of abusers was unknown persons with victims, and these trends were prominent in the jobless compared with more known persons in the student. 9. In the characteristics of the abuser, the working used more various psychoactive substances or alcohols, and more frequently experienced hallucination or delusion at the time of criminal offence compared with the other groups.