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연료 슬로싱 효과를 고려한 위성 기동 간의 SAR 안테나 반사판의 진동 분석
정바울(Ba-Woul Chung),김태현(Tae-Hyun Kim),서종은(Jong-Eun Suh),한재흥(Jae-Hung Han),이재은(Jae-Eun Lee),정화영(Hwa-Young Jung) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.1
Sloshing refers to the movement of a liquid free surface caused by disturbances of a liquid partially filled in a container. Sloshing generates forces and moments owing to the pressure distribution on the liquid free surface, which affect the dynamic stability of the vessel. An equivalent mechanical model that exerts the same amount of force and moment on the vessel wall as sloshing is used to analyze the sloshing effect on the vessel. This phenomenon also occurs in the fuel tank of a satellite structure that controls the attitude using a propulsion system with a liquid propellant. A satellite with a deployable synthetic-aperture radar (SAR) antenna, which is made of a thinner and lighter material, is likely to be more susceptible to various disturbances, including liquid sloshing. In this study, an analysis of a deployable SAR antenna reflector vibrating from the liquid fuel sloshing between the changes in the satellite’s attitude was conducted. The equivalent mechanical model is used to simulate the sloshing effect, and the vibrations of the reflector are compared and analyzed with and without the sloshing effect for the specified torque input.
정태환 ( Tae-hwan Jung ),황효정 ( Hyo-jeong Hwang ),윤숭섭 ( Sung-seob Yun ),이원재 ( Won-jae Lee ),김진욱 ( Jin-wook Kim ),신경옥 ( Kyung-ok Shin ),한경식 ( Kyoung-sik Han ) 한국유가공기술과학회 2016 Journal of Dairy Science and Biotechnology (JMSB) Vol.34 No.3
In many countries, goat milk is an excellent nutrient source and is less allergenic for children and the elderly. The casein composition of goat milk consists largely of β-casein and lower amounts of α<sub>s1</sub>-casein, which may interfere with digestion by forming solid curds in the human stomach. Goat milk contains small fat globules and large amounts of medium chain fatty acids for, better digestibility, as well as abundant minerals and vitamins with high absorption rates. Recently, the medical benefits of goat milk in different human disorders have been recognized, leading to an increased interest in developing functional foods with goat milk, particularly for individuals with malabsorption syndrome. However, the physiological and biochemical properties of goat milk are largely unknown. We review the importance of goat milk as a potential functional food by providing scientific evidence confirming its health benefits.
정재연,한수진,Jung, Jae-Yeon,Han, Su-Jin 한국치위생학회 2017 한국치위생학회지 Vol.17 No.5
Objectives: The objective of this study is to provide basic data needed in developing an educational program designed to upgrade capacity and awareness of preventive dental treatment among oral health workers, by analyzing levels of awareness of preventive dental treatment and educational needs among dentists and dental hygienists. Methods: The collected data was analyzed with SPSS program ver. 19.0. The data was under t-test. Results: The frequency level of giving preventive dental treatment to patients among dentists and dental hygienists is below mid-point, 3 on the 5-point Likert scale. In terms of frequency level per item, scaling & polishing was ranked the highest, followed by periodontal maintenance, tooth-brushing instruction, and prescription and instruction of oral care product in descending order. On the questions asking how important preventive dental care they perceive to be, both dentists and dental hygienists perceived it to be highly important. When they were asked to rank those items by the importance of education, they considered periodontal maintenance as the most important one, followed by individual education of oral health, incremental oral health care, scaling& polishing, toothbrushing instruction, and prescription and instruction of oral care product. Respondents pointed out problems in running a preventive dental treatment program as follows: overwork, lack of dedicated workforce, un-fixed costs, and lack of necessary equipment. When they were asked to point out items needed to run such a program, the largest number of respondents indicated dedicated workforce placement, followed by improving awareness of the customer, and improving awareness of the dental workers. Conclusions: In order to effectively run a preventive dental treatment program, it is necessary for oral health workers to clearly understand the concept of it. It is also necessary to develop and operate an education program on preventive dental treatment targeting oral health professionals.
정재한,선종주,민인규,김미영,최원우,홍진우,나병조,정우상,문상관,조기호,김영석,Jung, Jae-Han,Sun, Jong-Joo,Min, In-Kyu,Kim, Mi-Young,Choi, Won-Woo,Hong, Jin-Woo,Na, Byong-Jo,Jung, Woo-Sang,Moon, Sang-Kwan,Cho, Ki-Ho,Kim, Yong-Suk 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.4
Objectives : This study investigated stroke lesions and their relationship with warning signs and risk factors in stroke patients. Methods : Three hundred fifty-three stroke patients were recruited at the Department of Cardiovascular and Neurologic Diseases (stroke center) of Kyung Hee University Oriental hospital from October 2005 to July 2007. We evaluated their stroke lesions with brain MRI, their warning signs, and risk factors. Results : 353 subjects were included in the final analysis. The frequency of diabetes was found more in presence of brain stem lesion than without. The cortex lesion showed a close relationship with smoking, drinking and the frequency of one side paralysis or weakness. These were more common in males than in females. Conclusions : We observed stroke lesions and their characteristics in stroke patients. The subjects' brain lesions seemed affectedby the risk factors. A concrete conclusion can hardly be drawn from this study; additional research is necessary.
태아발육지연 유무에 따른 자간전증 임신태반에서의 Telomerase 활성도
정영내(Young Nae Jung),김세광(Sei Kwang Kim),정현철(Hyun Cheol Chung),박규현(Kyu Hyun Park),김창한(Chang Han Kim),조현정(Hyun Jung Cho),박용원(Yong Won Park),조재성(Jae Sung Cho),김인규(In Kyu Kim),양영호(Young Ho Yang),김재욱(Jae Wo 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.2
목적: 임신 제 3기 인체 태반에서 telomerase 활성도(TA) 발현 여부를 확인하고, 자간전증임신 태반에서 태아발육지연 유무에 따른 TA 발현 빈도를 비교 분석한다. 실험방법: 임신 29∼41주 사이의 태반 조직에서 Telomeric Repeat Amplification Protocol(TRAP) 분석방법에 의해 TA를 측정하였다. 연구 대상을 크게 세군으로 나누어 1군은 자간전증과 태아발육지연이 없었던 군 21명, 2군은 태아발육지연이 없는 중증 자간전증 9명, 3군은 중증 자간전증과 태아발육지연이 있었던 16명을 대상으로 TA 발현 빈도를 비교 분석하였다. 결과: 1군에서는 16/21(76.1%), 2군은 3/9(33.3%), 3군에서는 4/16(25%)의 빈도로 TA가 발현되었다. 이상의 결과로 1군에서 2군과 3군에 비해 TA발현이 의미 있게 높았으며(p=0.003), 2군 및 3군 각각에 비해서도 높은 TA 발현 빈도를 보였다(p<0.05). 그러나 2군과 3군 사이에서의 TA의 발현 빈도에는 유의한 차이가 없었다(p>0.05). 결론: 본 연구로 임신 제 3기 태반에서도 TA의 발현이 확인되었고, 중증 자간전증 및 태아발육지연을 동반한 중증 자간전증 태반에서 TA가 현저히 감소되는 것으로 보아 중증 자간전증 및 태아발육지연의 발생은 태반 노화나 apoptosis와 관련이 있을 가능성을 제시한다. Objectives: To analyze telomerase activity(TA) in human placenta tissues and to compare TA in preeclampsia with or without fetal growth restriction(FGR) Methods: Fourty-six placenta specimens were obtained from pregnant women between 29 and 41 weeks' gestation. TA of each specimen was analyzed including 21 specimens without either preeclampsia or FGR(Group 1), 9 specimens with preeclampsia but without FGR(Group 2), and 16 specimens with both preeclampsia and FGR(Group 3). TA was analysed by radioisotope PCR based telomeric repeat amplification protocol(TRAP) assay. TA was calculated and translated into arbitrary units by computer-assisted densitometry with the control of TA in 293 cell lines. Results: TA was expressed in 16 of 21(76.1%) in group 1, and in 3 of 9(33.3%) in group 2. In contrast, only 4 patients(25%) in group 3 expressed TA. Thus, TA was expressed significantly more often in group 1 than in group 2 and group 3(p=0.003). However, compared with group 2, expression of telomerase activity in group 3 was not reduced significantly(p>0.05). Conclusion: TA was minimal in placenta from preeclamptic women with and without FGR, suggesting placental senescence and apoptosis may be associated with FGR and severe preeclampsia.