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Design and evaluation of a LIPCA-actuated flapping device
Syaifuddin, Moh,Park, Hoon Cheol,Goo, Nam Seo Institute of Physics Publishing 2006 Smart materials & structures Vol.15 No.5
<P>In this paper, we have introduced a flapping wing mechanism actuated by a unimorph piezoceramic actuator, LIPCA (lightweight piezo-composite actuator). In the flapping system, the limited actuation displacement produced by bending motion of the simply supported actuator was transformed into a large flapping angle by using a four-bar linkage system. A wing rotation mechanism was also designed and implemented such that the wing can be passively rotated due to the resultant aerodynamic force during flapping motion. The natural flapping frequency of the device was about 9 Hz, where the maximum flapping angle was achieved. Flapping tests under 4–15 Hz flapping frequencies were performed to investigate the flapping performance by measuring the vertical force and forward force produced. The maximum forces were produced when the flapping device was actuated near the natural flapping frequency. The measured force data indicated that the present flapping system could produce positive average forces in the vertical and forward directions. </P>
Design and Test of Flapping Device Mimicking Insect Flight
Syaifuddin, Moh.,Park, Hoon Cheol,Yoon, Kwang Joon,Goo, Nam Seo Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.306 No.-
<P>This paper addresses detail design and demonstration of an insect-mimicking flappingwing mechanism composed of LIPCA (Lightweight Piezo-Composite Actuator) and linkage system that can amplify the actuation displacement of LIPCA. The angular amplification of the linkage system can provide various flapping angles by adjusting the actuation point of the LIPCA. The device can generate flapping frequency ranging from 5 to 50 Hz depending on weight of the wing and linkages. Flapping tests using different wing mass, area, and aspect ratio were performed to investigate the flapping performance. The test results were described and compared with the estimation. It was found that changes in wing mass, area, and aspect ratio result in significant variation of natural flapping-frequency.</P>
치과 병,의원에서의 원장의 리더십이 직무만족과 직무성과에 미치는 영향관계 -치과 병,의원에서 근무하는 여(女)직원을 중심으로-
박건모 ( Gon Moh Park ),안성식 ( Sung Sik Ahn ),이훈영 ( Hoon Young Lee ) 경희대학교 경영연구원 2011 의료경영학연구 Vol.5 No.1
A Dental business administration in Korea is in the center of sudden changes in 21 centuries. If there is not the desirably leadership of dental CEO with the satisfaction of employee, they would not be survived in such a competition. The purpose of this study is to develop the effective leadership characteristics to improve the job satisfaction and job results of employee in the dental part of administration. This study was conducted to examine th job satisfaction of 143 employee in dental hospitals and offices. Data were analyzed by AMOS package. In the organization of dental administration, the transformational leadership has more positive effect than the transactional leadership on the job satisfaction of dental employee like previous studies. But in displaying an effective leadership we have to consider the particularity of dental organization. That is, ⑴ the relative importance of "individual consideration" of the transformational leadership would be raised, ⑵ a "contingent reward" of the transactional leadership would not be passed over but be used well being harmonized with the transformational leadership. The satisfaction of employee would be directly connected to the satisfaction of patient and the increase of gross after all.
( In Ho Moh ),( Su Rin Shin ),( Hana Yoo ),( Sang Hoon Park ),( Myung Seok Lee ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: It is well known that hepatorenal syndrome (HRS) is associated with negative outcomes among patients with spontaneous bacterial peritonitis (SBP). However, it is unclear unclear whether a milder degree of kidney injury as acute kidney injury (AKI), defined as a rise in serum creatinine of ≥ 50% from baseline, or a rise of serum creatinine by 0.3 mg/dL in <48 h has associations with negative outcomes. This study aimed to evaluate the outcomes among SBP patients with and without AKI. Methods: We conducted a retrospective study of cirrhotic patients diagnosed with SBP between 2006 and 2012. Serum creatinine levels at the diagnosis of SBP were compared with baseline levels. Patients` records, as survival or death, were reviewed until March, 2013. Results: Data of 59 cases with SBP were reviewed. Thirty nine cases were male with a mean age of 56.7±9.4 years. There were 25 cases with AKI including 18 HRS and 34 cases without AKI. During follow-up period (mean 209.8±283.1 days), 19 deaths (72%) in the AKI group and 14 (41%) in the non-AKI group were noted. Survival was significantly lower in the AKI group than in non-AKI group (mean 146.9±39.1 vs. 422.3±71.0 days, P<0.001) by log rank test. The results were comparable to those of between patients with and without HRS (mean 138.7±48.7 vs. 376.3±61.9 days, P=0.001). The Cox regression survival ana lys is indi c ated that AKI , Chi ld-Pugh Cl ass C, thrombocytopenia(<150k) as independently negative prognostic indicators of survival. On multivariate analysis, only AKI remained statistically significant (P=0.004, Exp(B)=2.970). Conclusions: Our data indicates that episodes of AKI combined with SBP are associated with negative outcomes among cirrhotic patients. Attentions are necessary to patients who have a rise in serum creatinine elevation with SBP, even though it was a minor degree within normal range.
복강 내 발생한 Immunoglobulin G4 연관 염증성 가성종양
모인호 ( In Ho Moh ),김진배 ( Jin Bae Kim ),신수린 ( Su Rin Shin ),정성원 ( Sung Won Jung ),박상훈 ( Sang Hoon Park ),김정원 ( Jeong Won Kim ),신미경 ( Mi Kyung Shin ),이명석 ( Myung Seok Lee ) 대한소화기학회 2012 대한소화기학회지 Vol.60 No.4
The term inflammatory pseudotumor (IPT) has been used to describe inflammatory and fibrosing tumoral processes of an undetermined cause that may involve a variety of organ system. IgG4-related disease is a newly recognized fibroinflammatory condition characterized by IgG4-producing plasma cell expansion in affected organs and, often but not always, elevated serum IgG4 concentrations. IgG4-related IPTs, a subtype of IPT, are characterized by dense infiltration of IgG4-positive plasma cells and stromal fibrosis. The association between inflammatory pseudotumor and IgG4 was first reported with a regard to sclerosing pancreatitis. Despite there are many reports on intraperitoneal IPTs including both cellular and lymphoplasmacytic type, only a few cases have been confirmed to be IgG4-related. We experienced a case of intraperitoneal IgG4-related inflammatory pseudotumor in an 83-year-old woman presenting with epigastric pain and malaise. Surgical specimens revealed an IgG4-related inflammatory pseudotumor.
LIPCA 작동기로 구동되는 날갯짓 기구의 설계 및 성능평가
이승식(Seungsik Lee),모 시아푸딘(Moh. Syaifuddin),박훈철(Hoon Cheol Park),윤광준(Kwang Joon Yoon),구남서(Nam Seo Goo) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.12
본 논문에서 LIPCA(Lightweight Piezoceramic Composite Actuator)를 이용한 날갯짓(flapping) 기구의 개발에 관한 최근의 연구진척 사항을 제시하였다. 날갯짓 기구는 여러개의 연결막대를 이용하여 LIPCA의 제한된 작동변위를 커다란 날갯짓 각(flapping angle)이 발생하도록 증폭시켰으며, 패더링 메커니즘(feathering mechanism)을 적용하여 날갯짓과 동시에 날개에 비틀림이 발생하도록 설계되었다. 이 날갯짓 기구의 고유 날갯짓 주파수는 약 9㎐로, 이때 최대의 날갯짓 각이 발생하였다. 제작된 날갯짓 기구의 작동성능을 평가하기 위하여 날갯짓 주파수를 4㎐에서 15㎐까지 변화시키면서 발생되는 양력과 추력을 측정하였으며, 최대 양력과 최대 추력은 고유 날갯짓 주파수 부근에서 계측되었다. In this paper, we present our recent progress in the LIPCA (Lightweight Piezo-Composite Actuator) application for actuation of a flapping wing device. The flapping device uses linkage system that can amplify the actuation displacement of LIPCA. The feathering mechanism is also designed and implemented such that the wing can rotate during flapping. The natural flapping-frequency of the device was about 9 ㎐, where the maximum flapping angle was achieved. The flapping test under 4 ㎐ to 15 ㎐ flapping frequency was performed to investigate the flapping performance by measuring the produced lift and thrust. Maximum Lift and thrust were produced when the flapping device was actuated at about the natural flapping-frequency.
LC : Evaluation of Adrenal Insufficiency in Cirrhotic Patients in Korea
( Ha Na Yoo ),( Su Rin Shin ),( In Ho Moh ),( Sang Hoon Park ),( Myung Seok Lee ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: Adrenal insufficiency (AI) is frequent in cirrhotic patients with severe infection or hemodynamic instability. However, there is limited data about the prevalence of AI in stable cirrhotic patients and the impact of etiology of cirrhosis on AI. This study prospectively evaluated prevalence and characteristic of AI in stable cirrhotic using the conventional short synacthen, a synthetic analogue of adrenocorticotrophic hormone. Methods: From July 2011 to Aug 2012, a total of 50 cirrhotic patients without infections or hemodynamic instability admitted to two university-affi liated hospitals were enrolled. AI was defined by a total serum cortisol level < 18 μg/dL at 30 or 60 min after injection of 250 μg of synacthen. Results: Thirty eight patients were men and age was ranged 29-89 years. Etiology of cirrhosis was alcohol/viral hepatitis/ both/others in 26/6/10/8 patients. AI was present in 18 patients (36%). No significant difference was observed regarding age, gender, mean arterial pressures, and heart rates between patients with and without AI. The etiology of cirrhosis and degree of alcohol consumption did not affect presence of AI or basal and peak serum cortisol levels either. Prothrombin time was higher, while albumin was lower in patients with AI than those without AI. However, in multivariate analysis, there was no independent predictor of AI. The prevalence of AI increased according to severity of liver disease (17, 50, and 33% in Child- Pugh class A, B, and C respectively; P=0.174). There were negative correlations between Child-Pugh score and both basal cortisol (γ=-.377, P=0.007) and peak cortisol levels (γ=-.373, P<0.005) Conclusions: In this study, AI was frequent in stable cirrhotic patients without infections or hemodynamic instability. AI was not related to the etiology of cirrhosis or alcohol consumption, either. AI tended to be associated with only severity of liver disease.