http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The role of shape memory alloy on impact response of glass/epoxy laminates under low temperature
강기원,H. J. Kim,J. K. Kim 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.10
The paper aims to evaluate the impact response of glass/epoxy laminates with embedded shape memory alloy (SMA) subject to low velocity impact at various temperatures. For the goal, the impact tests were performed by using an instrumented impact-testing machine at three temperatures: 293K, 263K and 233K for the baseline (laminates without SMA wires) and SMA laminates (laminates with embedded SMA wires). And the resultant damages were inspected through the scanning acoustic microscope (SAM). Also, based on the impact force history and the damage configuration, the impact resistance parameters were employed to evaluate damage resistance of laminates with embedded SMA wires. As a result, it was observed that the damage resistance of glass/epoxy laminates is influenced by embedded SMA wires and embedding SMA wires into laminates does not compromise the structure any differently to laminates without wires. In fact, it has been shown that under lower temperature, the SMA laminates have a little superior damage resistance compared with the baseline laminates.
IS DOLLARIZATION GOOD FOR CAMBODIA?
강기원 연세대학교 동서문제연구원 2005 Global economic review Vol.34 No.2
During the 12 years since 1992 when people started to use the dollar as a currency in Cambodia, the share of the dollar has reached more than 70% of the total currency. This dollarization phenomenon has resulted in large seigniorage losses for the Cambodian government. The costs are estimated up to US$682 million at the end of 2004 with an additional US$61 million lost annually. Furthermore, there are many other kinds of costs caused by the side effects of seigniorage loss. Without siegiorage, some monetary, fiscal and foreign trade policies are no longer available. Worsening the distortion of income distribution is another side effect. These are major costs of dollarization over the direct seigniorage loss. The benefits of dollarization include stabilizing price levels and lowering the risk of national default during a foreign currency crisis. It is not difficult to conclude that the costs of dollarization outweigh the benefits. There are two de-dollarization methods. One is a policy that prohibits people from using the dollar as a currency by law. The other is the policy that widens the difference of the costs and the benefits of using dollar, also by law. Either method is applicable but it seems reasonable that the method of prohibition by direct law would be more effective and efficient than the other method, since 84% of total population exclusively uses the riel in Cambodia. It is totally dependant on the decision of Cambodian government whether or not a de-dollarization policy is adopted. The results of the decision, for good or ill, will rest finally with the people of Cambodia.
애구(艾灸)의 연소(燃燒) 구간별(區間別) 열량비(熱量比)에 대(對)한 연구(硏究)
강기원,남상수,이재동,최도영,안병철,박동석,이윤호,최용태,Kang Ki-Weon,Nam Sang-Soo,Lee Jae-Dong,Choi Do-Young,Ahn Byoung-Choul,Park Dong-Seok,Lee Yun-Ho,Choi Yong-Tae 대한침구의학회 1998 대한침구의학회지 Vol.15 No.2
In order to evaluate calorie rate of moxa-combustion(direct moxibustion=DM, indirect moxibustion with stainless steel tube=IMS, indirect moxibustion with ginger slice=IMG), calorie rate(%) in the preheating period, heating period, retaining period, and cooling period was calculated respectively to the total combustion calories in all the periods. The result are as follow: 1. Indirect moxibustion with stainless steel tube had the highest rate with the statistical significance than other groups during the preheating period, represented statistical differences between IMS group and IMG group, and also between DM group and IMS group. 2. Indirect moxibustion with ginger slice group showed the highest rate with the statistical significance and followed by DM group and IMG group during the heating period, represented statistical difference among DM, IMS, and IMG group. 3. Direct moxibustion group had the highest rate with the statistical significance than other group during the retaining period, represented statistical difference between DM group and IMG group, and also between DM group and IMS group. 4. Indirect moxibustion with stainless steel tube had the highest rate with the statistical significance than other groups during the cooling period, represented statistical differences between IMS group and IMG group, and also between IMS group and DM group.