Analysis on Current Distribution of Four-Layer HTSC Power Transmission Cable with a Shield Layer

Sung-Hun Lim 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.3

The inductance difference between conducting layers of high-Tc superconducting (HTSC) power transmission cable causes the current sharing of each conducting layer to be unequal, which decreases the current transmission capacity of HTSC power cable. Therefore, the design for even current sharing in HTSC power transmission cable is required. In this paper, we investigated the current distribution of HTSC power cable with a shield layer dependent on the pitch length and the winding direction of each layer. To analyze the effect of the shield layer on the current sharing of the conducting layers of HTSC power cable, the current distribution of HTSC power cable without a shield layer was compared with the case of HTSC power cable with a shield layer. It could be found through the analysis from the computer simulations that the shield layer of HTSC power cable could be contributed to the improvement of current distribution of conducting layers at the specific pitch length and the winding direction of conducting layer. The result and discussion for the current distribution calculated for HTSC power transmission cable with a shield layer were presented and compared with the cable without a shield layer.

Analysis on Current Distribution of Four-Layer HTSC Power Transmission Cable with a Shield Layer

Lim Sung-Hun The Korean Institute of Electrical Engineers 2006 Journal of Electrical Engineering & Technology Vol.1 No.3

The inductance difference between conducting layers of high-Tc superconducting (HTSC) power transmission cable causes the current sharing of each conducting layer to be unequal, which decreases the current transmission capacity of HTSC power cable. Therefore, the design for even current sharing in HTSC power transmission cable is required. In this paper, we investigated the current distribution of HTSC power cable with a shield layer dependent on the pitch length and the winding direction of each layer. To analyze the effect of the shield layer on the current sharing of the conducting layers of HTSC power cable, the current distribution of HTSC power cable without a shield layer was compared with the case of HTSC power cable with a shield layer. It could be found through the analysis from the computer simulations that the shield layer of HTSC power cable could be contributed to the improvement of current distribution of conducting layers at the specific pitch length and the winding direction of conducting layer. The result and discussion for the current distribution calculated for HTSC power transmission cable with a shield layer were presented and compared with the cable without a shield layer.

Layer-specific cholinergic modulation of synaptic transmission in layer 2/3 pyramidal neurons of rat visual cortex

Kwang-Hyun Cho,Seul-Yi Lee,Kayoung Joo,Duck-Joo Rhie 대한약리학회 2019 The Korean Journal of Physiology & Pharmacology Vol.23 No.5

It is known that top-down associative inputs terminate on distal apical dendrites in layer 1 while bottom-up sensory inputs terminate on perisomatic dendrites of layer 2/3 pyramidal neurons (L2/3 PyNs) in primary sensory cortex. Since studies on synaptic transmission in layer 1 are sparse, we investigated the basic properties and cholinergic modulation of synaptic transmission in layer 1 and compared them to those in perisomatic dendrites of L2/3 PyNs of rat primary visual cortex. Using extracellular stimulations of layer 1 and layer 4, we evoked excitatory postsynaptic current/potential in synapses in distal apical dendrites (L1-EPSC/L1EPSP) and those in perisomatic dendrites (L4-EPSC/L4-EPSP), respectively. Kinetics of L1-EPSC was slower than that of L4-EPSC. L1-EPSC showed presynaptic depression while L4-EPSC was facilitating. In contrast, inhibitory postsynaptic currents showed similar paired-pulse ratio between layer 1 and layer 4 stimulations with depression only at 100 Hz. Cholinergic stimulation induced presynaptic depression by activating muscarinic receptors in excitatory and inhibitory synapses to similar extents in both inputs. However, nicotinic stimulation enhanced excitatory synaptic transmission by ~20% in L4-EPSC. Rectification index of AMPA receptors and AMPA/NMDA ratio were similar between synapses in distal apical and perisomatic dendrites. These results provide basic properties and cholinergic modulation of synaptic transmission between distal apical and perisomatic dendrites in L2/3 PyNs of the visual cortex, which might be important for controlling information processing balance depending on attentional state.

Layer-specific cholinergic modulation of synaptic transmission in layer 2/3 pyramidal neurons of rat visual cortex

조광현,이슬이,주가영,이덕주 대한약리학회 2019 The Korean Journal of Physiology & Pharmacology Vol.23 No.5

It is known that top-down associative inputs terminate on distal apical dendrites in layer 1 while bottom-up sensory inputs terminate on perisomatic dendrites of layer 2/3 pyramidal neurons (L2/3 PyNs) in primary sensory cortex. Since studies on synaptic transmission in layer 1 are sparse, we investigated the basic properties and cholinergic modulation of synaptic transmission in layer 1 and compared them to those in perisomatic dendrites of L2/3 PyNs of rat primary visual cortex. Using extracellular stimulations of layer 1 and layer 4, we evoked excitatory postsynaptic current/potential in synapses in distal apical dendrites (L1-EPSC/L1EPSP) and those in perisomatic dendrites (L4-EPSC/L4-EPSP), respectively. Kinetics of L1-EPSC was slower than that of L4-EPSC. L1-EPSC showed presynaptic depression while L4-EPSC was facilitating. In contrast, inhibitory postsynaptic currents showed similar paired-pulse ratio between layer 1 and layer 4 stimulations with depression only at 100 Hz. Cholinergic stimulation induced presynaptic depression by activating muscarinic receptors in excitatory and inhibitory synapses to similar extents in both inputs. However, nicotinic stimulation enhanced excitatory synaptic transmission by ~20% in L4-EPSC. Rectification index of AMPA receptors and AMPA/NMDA ratio were similar between synapses in distal apical and perisomatic dendrites. These results provide basic properties and cholinergic modulation of synaptic transmission between distal apical and perisomatic dendrites in L2/3 PyNs of the visual cortex, which might be important for controlling information processing balance depending on attentional state.

Modified oxygen transmission model for layer by layer self assembly film

이성윤,민수정,이준영,신교직,최경호,이상국 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

Layer by layer self-assembly (LbL-SA) film has been used as a barrier film to disturb the transmission rate of undesired materials that have a higher vapor pressure than an atmospheric pressure. Although several oxygen transmission models have been investigated to correlate the state and contents of inorganic materials such as clay with gas permeability, it is difficult to apply these equations to the LbL-SA film due to the partially condensed clay in each layer. In this study, modified composite-type model was introduced by the sum of each layer. Particularly, it was implied that not only the tortuous pathway but also the pore size and density in the clay layer can be proportioned to the oxygen transmission rate.

Layer-specific cholinergic modulation of synaptic transmission in layer 2/3 pyramidal neurons of rat visual cortex

Cho, Kwang-Hyun,Lee, Seul-Yi,Joo, Kayoung,Rhie, Duck-Joo The Korean Society of Pharmacology 2019 The Korean Journal of Physiology & Pharmacology Vol.23 No.5

It is known that top-down associative inputs terminate on distal apical dendrites in layer 1 while bottom-up sensory inputs terminate on perisomatic dendrites of layer 2/3 pyramidal neurons (L2/3 PyNs) in primary sensory cortex. Since studies on synaptic transmission in layer 1 are sparse, we investigated the basic properties and cholinergic modulation of synaptic transmission in layer 1 and compared them to those in perisomatic dendrites of L2/3 PyNs of rat primary visual cortex. Using extracellular stimulations of layer 1 and layer 4, we evoked excitatory postsynaptic current/potential in synapses in distal apical dendrites (L1-EPSC/L1-EPSP) and those in perisomatic dendrites (L4-EPSC/L4-EPSP), respectively. Kinetics of L1-EPSC was slower than that of L4-EPSC. L1-EPSC showed presynaptic depression while L4-EPSC was facilitating. In contrast, inhibitory postsynaptic currents showed similar paired-pulse ratio between layer 1 and layer 4 stimulations with depression only at 100 Hz. Cholinergic stimulation induced presynaptic depression by activating muscarinic receptors in excitatory and inhibitory synapses to similar extents in both inputs. However, nicotinic stimulation enhanced excitatory synaptic transmission by ~20% in L4-EPSC. Rectification index of AMPA receptors and AMPA/NMDA ratio were similar between synapses in distal apical and perisomatic dendrites. These results provide basic properties and cholinergic modulation of synaptic transmission between distal apical and perisomatic dendrites in L2/3 PyNs of the visual cortex, which might be important for controlling information processing balance depending on attentional state.

휴대 장치를 위한 Layered Transmission에 관한 연구

박노경,서상진,진현준 湖西大學校 工業技術硏究所 2005 工業技術硏究所論文集 Vol.24 No.-

Mobile multimedia services have rapidly evolved in the areas mainly including cell phones. Due to the increment of data traffic, processing load of server systems, network congestion and response time of clients also increase constantly. In this paper, a layered transmission technology is proposed of which the size of requested stream from clients has reduced and its performance is evaluated through the simulation. The layered transmission decreases data traffic to 78.5% averagely by converting format of data source in accordance with the playback performance of mobile devices. It is analyzed that decrement of streaming data size depends on EFS, resolution of LCD screen, and bytes per pixel. For real applications, layered transmission consists of modules based on filters using the Directshow considering portability, scalability, and reusability.

퓨대 장치를 위한 Layered Transmission에 관한 연구

박노경(Nho-Kyung Park,)서상진(Sang-jin Seo),진현준(Hyun-Joon Jin) 호서대학교 공업기술연구소 2005 공업기술연구 논문집 Vol.24 No.1

Mobile multimedia services have rapidly evolved in the areas mainly including cell phones. Due to the increment of data traffic, processing load of server systems, network congestion and response time of clients also increase constantly. In this paper, a layered transmission technology is proposed of which the size of requested stream from clients has reduced and its performance is evaluated through the simulation. The layered transmission decreases data traffic to 78.5% averagely by converting format of data source in accordance with the playback performance of mobile devices. It is analyzed that decrement of streaming data size depends on EFS, resolution of LCD screen, and bytes per pixel. For real applications, layered transmission consists of modules based on filters using the Directshow considering portability, scalability, and reusability.

소통의 측면에서 본 기이담(奇異談) 향유 - 《천예록》 기이담 향유에서 드러나는 복합적 소통의 양상과 그 의미에 대한 고찰을 중심으로 -

박은진 ( Park Eun Jin ) 서울대학교 국어교육과 2020 先淸語文 Vol.47 No.-

The purpose of this paper is to explain the enjoyment of Gi-Yi(奇異) stories as a view point of communication. In early Yadam(野談) studies, unrealistic yadam texts are treated like meaninglessness texts, and it is not treated in academic area. After changing view point about unrealistic Yadam, texts like 《Cheonyerok》 are treated in various ways. But in these studies about 《Cheonyerok》 are not focused about the difference of narrative chapter and comment chapter. So this study focused on both narrative chapter and comment chapter and try to explain the enjoyment phenomena as communication aspect. Literary acception is also text communication through literature text, and Gi-Yi stories enjoyment are can be treated under the point of communication. Yadam Gi-Yi(奇異) story enjoyment are explained as two layers, as creation layer and transmission layer. In creation layer, Gi-Yi(奇異) stories in 《Cheonyerok》 are showing self-communication and it causes the complx communication in transmission layer. In transmission layer, Gi-Yi stories show five complex communication types. The most frequent type is “to express Gi-Yi discourse effetive-true false jugement” type. It can be interpreted as culural meaning as horrible era as unrealistis sotories are treated as information resource. And it can be a meaning in communication in korean education in various aspects.

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Seon-Guk Kim,Ok-Kyung Park,Joong Hee Lee,Bon-Cheol Ku 한국탄소학회 2013 Carbon Letters Vol.14 No.4

In this study, we present a facile method of fabricating graphene oxide (GO) filmson the surface of polyimide (PI) via layer-by-layer (LBL) assembly of charged GO. The positively charged amino-phenyl functionalized GO (APGO) is alternatively complexed with the nega-tively charged GO through an electrostatic LBL assembly process. Furthermore, we investi-gated the water vapor transmission rate and oxygen transmission rate of the prepared (reduced GO [rGO]/rAPGO)10 deposited PI film(rGO/rAPGO/PI) and pure PI film.The water vapor transmission rate of the GO and APGO-coated PI composite filmwas increased due to the intrinsically hydrophilic property of the charged composite films.However, the oxygen trans-mission rate was decreased from 220 to 78 cm3/m2·day·atm, due to the barrier effect of the graphene filmson the PI surface. Since the proposed method allows for large-scale production of graphene films, it is considered to have potential for utiliation in various applications.