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분위기에서 Al-Mg합금의 SiO2에 대한 젖음실험의 타당성 고찰
장형민 ( Hyung Min Jang ),이창면 ( Chang Myeon Lee ),이준호 ( Joon Ho Lee ),이재훈 ( Jae Hoon Lee ),이재철 ( Jae Chul Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.6
The effects that processing atmospheres and alloy composition have on the wetting characteristics of Al-Mg alloys on the SiO2 substrate were investigated by measuring the wetting angles. It was observed that the wetting behavior of the Al-Mg alloys on the SiO2 substrate vary depending on the Mg content of the alloys and atmospheres. The results showed that the contact angle decreases with increasing Mg content, angle is generally larger in the N2 atmosphere than in the Ar atmosphere. We discussed the validity of the results obtained from the wetting test on the basis of recent theories and the results observed from the actual penetration tests. (Received January 9, 2009)
유도 결합 구조를 응용한 UHF 대역 Near-Isotropic 태그 안테나
안준오,장형민,문효상,이범선,Ahn, Jun-Oh,Jang, Hyung-Min,Moon, Hyo-Sang,Lee, Bom-Son 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.12
본 논문에서는 유도 결합 구조를 응용하여 등방향 방사 특성에 근접하고 기 상용화된 태그 칩과의 임피던스 매칭과 제작이 용이한 UHF(911 MHz) 대역 RFID 태그 안테나를 설계 제작하였다. 제안된 안테나는 $40{\times}46mm\;(0.12{\times}0.14{\lambda})$의 크기를 가지고 수직 입사의 경우에 최대 RCS가 $-18.5dBm^2$이며, 3 dB RCS 대역폭이 9 MHz(1%)이다. 태그 칩과 안테나 임피던스가 단락 상태일 때의 RCS가 방향에 따라 최대 $-16.9dBm^2$, 최소 $-21.4dBm^2$로 4.5 dB의 차이를 보여, 기존 다이폴 형태의 안테나가 가지는 입사파의 방향에 따른 문제점을 대폭 개선하였다. 또한 설계된 안테나를 제작하여 입사파 각도에 따른 RCS를 측정하였고, 시뮬레이션 결과와 유사함을 확인하였다. This paper presents an UHF band(911 MHz) RFID tag antenna which has near-isotropic radiation pattern and easy conjugate impedance matching characteristics to any commercial chips of usual practice through the application of an inductively-coupled feeding. The proposed antenna of compact size $40{\times}46mm\;(0.12{\times}0.14{\lambda})$ has, at normal incidence, the maximum RCS of $-18.5dBm^2$ and the 3 dB RCS bandwidth of 9 MHz(1 %) in case of short chip load. It has the maximum and minimum RCS' of $-16.9dBm^2\;and\;-21.4dBm^2$ depending on the incident angles. The difference of about 4.5 dB is relatively small compared with that (about 70 dB) of a pure dipole antenna. The designed antenna has been fabricated and its RCS' have been measured varying the angles of incidence. The measured RCS' have been found to have good agreement with the simulated ones.
안정숙(Joung-Sook Ahn),장형민(Hyung-Min Jang),김민혁(Min-Hyuk Kim),김혜지(Hae-Ji Kim),신정호(Jongho Shin) 한국중독정신의학회 2008 중독정신의학 Vol.12 No.2
Once females drink alcohol, they are more apt to become alcohol-dependent than males and respond poorly to intervention. Therefore, gender-specific approaches to drinking prevention and treatment are clearly needed. The aims of this article are to investigate the relationship between maternal problem-drinking, substance use, and psychopathology of female adolescents and to compare the maternal problem-drinking group with paternal, parental problem-drinking groups and controls. Ninth grade (N= 420) and 11th grade (N=353) females were divided into maternal drinking groups and controls with the score of Children of Alcoholics Screening Test (CAST) for mother. Two groups were compared for their environmental and substance-related variables, and psychopathology was measured with the Strengths and Difficulties Questionnaire (SDQ-SR). Then the subjects were divided into four groups with scores of CAST for mother and father separately and compared the same way. Female adolescents with drinking mothers showed a younger age of first drink-ing, absence of family norms for TV watching, a lot of smoking friends, problem-drinking, and higher scores in the ‘hyperactivity-inattention’ and ‘total difficulties’ sections of the SDQ-SR. ‘Parental drinking’ was the worst condition for adolescent fe-males, followed by ‘maternal drinking only’ and ‘paternal drink-ing only’, successively. However, emotional symptoms were more prevalent in cases of ‘maternal drinking only’. We suggested that the dyad of problem-drinking mother and adolescent female should be a focus of family intervention programs against drinking.
이유라(You-Ra Lee),신정호(Jong-Ho Shin),민성호(Seong-Ho Min),김태희(Tae-Hui Kim),김민혁(Min-Hyuck Kim),장형민(Hyung-Min Chang),박기창(Ki-Chang Park),안정숙(Joung-Sook Ah),전영안(Yong-An Jeon),장지숙(Jee-Sook Jang) 한국중독정신의학회 2005 중독정신의학 Vol.9 No.1
Objectives:This study was designed to find out the changes of alcohol use behavior and it’s attributing factors through two surveys conducted in 1998 and 2004 in a rural community. Methods:We selected 116 problem drinkers and 116 matched non-problem drinkers among 480 men of the first survey. We surveyed basic epidemiologic data and alcohol use behavior with several questionnaires. Results:The results were as follows : 1) Drinking amount and frequency decreased with increasing age. 2) More than half among previous problem drinkers did not show any significant change in their alcohol use behavior. 3) Most of previous non-problem drinkers maintained their past alcohol use behavior. 4) Continuous problem drinkers had larger amount of past alcohol drinking than no more problem drinkers. They had lower scores on awareness of negative consequence, higher scores on drinking for coping strategy of Alcohol Effects Questionnaire (AEQ) and higher scores on drinking urge to relieve hangover of the Severity of Alcohol Dependence Questionnaire (SADQ) than no more problem drinkers. 5) Continuous problem drinkers showed more smoking and earlier drinking than continuous non-problem drinkers. 6) Continuous problem drinkers became poorer than no more problem drinkers. Conclusions: Continuous problem drinking pattern was associated with larger amount of past alcohol drinking, higher drinking frequency, higher drinking urge to relieve hangover, higher use of drinking for coping strategy and less awareness of negative consequence.