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History of Bioelectrical Study and the Electrophysiology of the Primo Vascular System
Park, Sang Hyun,Kim, Eung Hwi,Chang, Ho Jong,Yoon, Seung Zhoo,Yoon, Ji Woong,Cho, Seong-Jin,Ryu, Yeon-Hee Hindawi Publishing Corporation 2013 Evidence-based Complementary and Alternative Medic Vol.2013 No.-
<P><I>Background</I>. Primo vascular system is a new anatomical structure whose research results have reported the possibility of a new circulatory system similar to the blood vascular system and cells. Electrophysiology, which measures and analyzes bioelectrical signals tissues and cells, is an important research area for investigating the function of tissues and cells. The bioelectrical study of the primo vascular system has been reported by using modern techniques since the early 1960s by Bonghan Kim. This paper reviews the research result of the electrophysiological study of the primo vascular system for the discussion of the circulatory function. We hope it would help to study the electrophysiology of the primo vascular system for researchers. This paper will use the following exchangeable expressions: Kyungrak system = Bonghan system = Bonghan circulatory system = primo vascular system = primo system; Bonghan corpuscle = primo node; Bonghan duct = primo vessel. We think that objective descriptions of reviewed papers are more important than unified expressions when citing the papers. That said, this paper will unify the expressions of the primo vascular system.</P>
The Application of Antisense RNA Technology for plant Secondary Metabolism
Kim, Yong-Kyung,Xu, Hui,Kim, Young-Seon,Kim, Eung-Hwi,Park, Sang-Un 충남대학교 농업과학연구소 2007 농업과학연구 Vol.34 No.1
유전자의 발현이 다양한 형태로 억제되는 것을 silencing이라고 한다. 유전자 발현억제 방법 중 antisense RNA는 자연 상태의 mRNA에 역상보적인 RNA 분자로서 형질전환된 세포에서 그 mRNA의 전이을 억제하는 데 이용된다. RNA분자에 대하여 상보적 염기배열을 갖는 RNA는 분자간 결합을 연결하여 RNA의 기능 발현에 억제적으로 작용한다고 생각된다. 미생물에 나타나는 유전자발현 제어기작으로서 어느 특정한 mRNA에 대하여 상보적인 RNA가 유전자 발현의 억제인자로서 작용하고 있는 예가 몇 가지 알려져 있다. 이러한 경우 antisense RNA는 mRNA 상의 전이개시 영역과 상보적 배열을 하고 있고, 전이과정을 방해한다고 추정되고 있지만 작용기작의 상세한 내용 은 아직 명확하지가 않다. 한편 안티센스RNA는 임의의 표적유전자에 대하여 인위적으로 제작할 수가 있기 때문에 인위적인 유전자발현제어의 한 방법으로 이용되고 있다. 특정한 유전자에 대한 antisense RNA를, 발현하는 유전자를 인위적으로 제작하여 세포내에 도입하면 표적유전자의 발현을 특이적으로 억제·제어할 수 있는 것이 기대되어, 다양한 생물체를 대상으로 하여 많은 시도가 이루어지고 있으며 몇 가지 성공적인 보고가 있다. 그 중 식물이차대사과정에 관련 유전자를 대상으로 antisense RNA 기법으로 유전자의 발현억제와 이차대사산물 생산조절에 관한 연구를 이 논문에서 조사하고 정리하였다.
The Application of Antisense RNA Technology for Plant Secondary Metabolism
Yong-Kyung Kim(김용경),Hui Xu(서혜),Young-Seon Kim(김영선),Eung-Hwi Kim(김응휘),Sang-Un Park(박상언) 충남대학교 농업과학연구소 2007 농업과학연구 Vol.34 No.1
유전자의 발현이 다양한 형태로 억제되는 것을 silencing이라고 한다. 유전자 발현억제 방법 중 antisense RNA는 자연 상태의 mRNA에 역상보적인 RNA 분자로서 형질전환된 세포에서 그 mRNA의 전이을 억제하는 데 이용된다. RNA분자에 대하여 상보적 염기배열을 갖는 RNA는 분자간 결합을 연결하여 RNA의 기능 발현에 억제적으로 작용한다고 생각된다. 미생물에 나타나는 유전자발현 제어기작으로서 어느 특정한 mRNA에 대하여 상보적인 RNA가 유전자 발현의 억제인자로서 작용하고 있는 예가 몇 가지 알려져 있다. 이러한 경우 antisense RNA는 mRNA 상의 전이개시 영역과 상보적 배열을 하고 있고, 전이과정을 방해한다고 추정되고 있지만 작용기작의 상세한 내용은 아직 명확하지가 않다. 한편 안티센스RNA는 임의의 표적유전자에 대하여 인위적으로 제작할 수가 있기 때문에 인위적인 유전자발현제어의 한 방법으로 이용되고 있다. 특정한 유전자에 대한 antisense RNA를, 발현하는 유전자를 인위적으로 제작하여 세포내에 도입하면 표적유전자의 발현을 특이적으로 억제·제어할 수 있는 것이 기대되어, 다양한 생물체를 대상으로 하여 많은 시도가 이루어지고 있으며 몇 가지 성공적인 보고가 있다. 그 중 식물이차대사과정에 관련 유전자를 대상으로 antisense RNA 기법으로 유전자의 발현억제와 이차대사산물 생산조절에 관한 연구를 이 논문에서 조사하고 정리하였다.
MREIT Conductivity Imaging of Pneumonic Canine Lungs: Preliminary Post-mortem Study
Kim, Hyung-Joong,Kim, Young-Tae,Jeong, Woo-Chul,Minhas, Atul S.,Lee, Tae-Hwi,Lim, Chae-Young,Park, Hee-Myung,Kwon, O-Jung,Woo, Eung-Je The Korean Society of Medical and Biological Engin 2010 의공학회지 Vol.31 No.2
In magnetic resonance electrical impedance tomography (MREIT), a current-injection MR imaging method is adopted to produce a cross-sectional image of an electrical conductivity distribution in addition to MR images. The purpose of this study was to test the feasibility of MREIT for differentiating the canine lung parenchyma without and with pneumonia. Three normal healthy beagles and two mixed breed dogs with pneumonia were used. After attaching electrodes around the chest, we placed the dog inside our MR scanner. We injected as much as 30 mA current in a form of short pulses into the chest region. Reconstructed conductivity images of normal canine lungs exhibit a peculiar pattern of a relatively coarse salt and pepper noise. On the contrary, conductivity images of pneumonic canine lungs show significantly enhanced contrast of the lesions while the corresponding MR images show a little bit of contrast in the middle and caudal lung parenchyma due to the accumulation of pleural fluid. This preliminary study indicates that MREIT imaging of the chest may deliver unique new diagnostic information.
Development of a System for Diagnosing Faults in Rotating Machinery using Vibration Signals
Jae-Eung Oh,Choong-Hwi Lee,Hyoun-Jin Sim,Hae-Jin Lee,Seong-Hyeon Kim,Jung-Youn Lee 한국정밀공학회 2007 International Journal of Precision Engineering and Vol.8 No.3
It is widely recognized that increasing the accuracy and diversity of rotating machinery necessitates an appropriate diagnostic technique and maintenance system. Until now, operators have monitored machinery using their senses or by analyzing simple changes to root mean square output values. We developed an expert diagnostic system that uses fuzzy inference to expertly assess the condition of a machine and allow operators to make accurate judgments. This paper describes the hardware and software to the expert diagnostic system. An assessment of the diagnostic performance for five fault phenomena typically found in pumps is also described.
Yong Kyung Kim,Hui Xu,Eung Hwi Kim,Yun Pyo Choi,Hee Bong Lee,Sang Un Park 한국작물학회 2007 한국작물학회 학술발표대회 논문집 Vol.2007 No.11
Bitter melon (Momordica charantia L.) is a tropical and subtropical vine of the family Cucurbitaceae, widely grown for edible fruit, which is among the most bitter of all vegetables. Bitter melon contains an array of biologically active plant chemicals including triterpenes, proteins, and steroids. The fruit is useful in gout, rheumatism and subacute cases of the spleen and liver diseases. It is supposed to purify blood and dissipate melancholia. It has also been shown to have hypoglycaemic properties (anti-diabetic) in animal as well as human studies. Raw materials of used in pharmaceuticals, health food, cosmetics, food, perfumery and other industries. However, bitter melon is not popular in Korea. For research, development and commercialization of bitter melon in Korea, we collected 13 varieties of bitter melon from domestic andabroad. We study biological and chemical characteristics of bitter melon. In general frui tsize and weight of Philippines and Japanese varieties was larger than that of Chinese and Korean. We are studying chemical analysis of useful compound (diosgenin and GABA) from bitter melon.
Reconstruction of conductivity using the dual-loop method with one injection current in MREIT
Lee, Tae Hwi,Nam, Hyun Soo,Lee, Min Gi,Kim, Yong Jung,Woo, Eung Je,Kwon, Oh In Institute of Physics in association with the Ameri 2010 Physics in medicine & biology Vol.55 No.24
<P>Magnetic resonance electrical impedance tomography (MREIT) is to visualize the internal current density and conductivity of an electrically conductive object. Injecting current through surface electrodes, we measure one component of the induced internal magnetic flux density using an MRI scanner. In order to reconstruct the conductivity distribution inside the imaging object, most algorithms in MREIT have required multiple magnetic flux density data by injecting at least two independent currents. In this paper, we propose a direct method to reconstruct the internal isotropic conductivity with one component of magnetic flux density data by injecting one current into the imaging object through a single pair of surface electrodes. Firstly, the proposed method reconstructs a projected current density which is a uniquely determined current from the measured one-component magnetic flux density. Using a relation between voltage potential and current, based on Kirchhoff's voltage law, the proposed method is designed to use a combination of two loops around each pixel from which to derive an implicit matrix system for determination of the internal conductivity. Results from numerical simulations demonstrate that the proposed algorithm stably determines the conductivity distribution in an imaging slice. We compare the reconstructed internal conductivity distribution using the proposed method with that using a conventional method with agarose gel phantom experiments.</P>