• Title/Summary/Keyword: PCS

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A Research on Development of Unified RF Module for PCS Base Station (PCS 기지국의 통합 RF 모듈 개발에 관한 연구)

  • 황선호;박준현
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.2B
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    • pp.145-150
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    • 2002
  • This paper presents an implementation methodology of unified PCS base station system which, is capable of providing PCS services for 3 PCS carriers concurrently. We have built up an unified PCS BTS using a unification module, which is consisted of a multi-channel combiner, duplexer, LNA, power divider, feeder line, and a common set of antennas. PCS unification module is featured with wide-band and high power handling capability and electrical characteristics like insertion loss, isolation have been greatly improved. It was shown that performance of the system in terms of Ec/Io and mobile receive power within the total 30MHz PCS frequency range is uniformly acceptable and measured signal quality and coverage are equivalent to that of the individual PCS base station.

Development of Common PCS Base Station System (PCS 공용 기지국 시스템 개발)

  • 황선호;박준현;김훈석
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.214-217
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    • 2001
  • This paper presents an implementation methodology of common Rf- integrated PCS base station system which, is capable of providing PCS services for 3 PCS carriers concurrently and wireless system performance evaluation data is shown. We have built up a common PCS base station system using a commonization module, which is consisted of a multi-channel combiner, duplexer, LNA, power divider, feeder line, and a common set of antennas. It was shown that the performance of the system within the total 30MHz PCS frequency range is uniformly acceptable and measured signal quality and coverage are equivalent to that of the individual PCS base station. It is expected that PCS carriers are able to save a huge amount of installation and maintenance expenses by installing and sharing this base station system. This paper forms a groundwork for deploying efficient and economical IMT-2000 network.

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Implementation of Dielectric Duplexers and Bandpass Filters for K-PCS and US-PCS Bands (K-PCS와 US-PCS 대역용 유전체 듀플렉서와 밴드패스 필터 구현)

  • Choi, U-Sung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.7
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    • pp.1433-1438
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    • 2011
  • Relative attenuations of Tx and Rx in K-PCS and US-PCS duplexers were about -60dB and -65dB, -51dB and -53dB, respectively. In the case of Rx and Tx in K-PCS and US-PCS bandpass filters, relative attenuations were about -40dB and -14dB, -5dB and -10dB, respectively. From the aboved results, the relative affect between Tx and Rx in K-PCS bands was smaller than that of US-PCS bands. Also, the various capacitances of passband were important role to determine the characterics of bandpass filter.

Effects of Concentration and Size of Porous Calcium Silicate (PCS) in Broiler Feeds on Performances, Fly Generation and Malodorous Gas Emission (Porous Calcium Silicate(PCS)의 급여수준 및 PCS 입자 크기가 육계의 성장, 파리 및 악취 발생에 미치는 영향)

  • Jeon, B.S.;Song, J.I.;Jeon, J.H.;Kwag, J.H.;Kang, H.S.;Choi, H.C.;Kim, T.I.;Lee, E.S.;Nahm, K.H.
    • Journal of Animal Environmental Science
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    • v.15 no.2
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    • pp.115-130
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    • 2009
  • Three experiments on the addition of Porous Calcium Silicate (PCS) to broiler feed were conducted at different time periods in the same house. Each treatment had 4 replicates with 12 chicks in each treatment. Weight gain and feed intake were higher ($P{\le}0.05$) in the control groups. Feed conversions' were better ($P{\le}0.05$) in the PCS group, 3.0% PCS and 20 mesh size of PCS than the control group from 21 to 49 days, and for the overall period. $NH_3$ and $H_2S$. gas production were decreased ($P{\le}0.05$) when zeolite was added in broiler feeds. 1.5% or 3.0% PCS in broiler feed was better ($P{\le}0.05$) than the 4% PCS. More than 90 mesh size PCS was better ($P{\le}0.05$) in controlling $CO_2$ production in the 5th period than the 20 or 50 mesh size or control groups. The control and PCS groups produced more flies ($P{\le}0.05$) than zeolite group during the 2nd and 3rd weeks. The 3.0% or 4.5% PCS or 50 or 90 mesh size of PCS in broiler feed produced more flies than the 20 mesh size or control groups although 50 or 90 mesh size of PCS during 5th week tended to have lower fly production than the 20 mesh size of PCS and control group.

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PCS Research and Development in Shinsegi Telecomm. Inc. (신세기통신의 PCS 연구개발현황)

  • 박용길;정동근;이도영
    • Information and Communications Magazine
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    • v.12 no.8
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    • pp.53-64
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    • 1995
  • In this article, criteria and considerations for selecting a domestic Personal Communications Services (PCS) system in Korea are presented and upbanded IS-95 Common Air Interface (CAI) is asserted to be appropriate as a result of evaluation by the criteria. And Shinsegi Telecomm, Inc. (STI) is claimed to be a suitable operator to provide PCS by upbanded IS-95 considering the experiences as the cellular operator adopting IS-95 CDMA technology. The PCS R&D plan and strategies of STI are given and the joint R&D plan with domestic manufacturers to develop PCS systems are explained. The results from R&D so far are mentioned. The PCS network architecture and various services-basic voice service, value-added services and wireless data services-are discussed.

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A sudy on the Out-of-band Noise Power for PCS Unified Repeater (PCS 통합중계기의 대역외 잡음에 관한 연구)

  • 황선호;김훈석
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.359-362
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    • 2002
  • The increase in the number of PCS base station and repeater has increased the level of interference between PCS carriers. In this paper, interference of singular PCS repeater out-of-band noise power on mobile phone is analysed and compared with that of unified PCS repeater for multiple PCS carriers. It is shown that unified PCS repeater provide about 2∼3dB signal gain in comparison with conventional PCS repeater. As a result, the interference of out-of-band noise power on mobile phone is reduced. It is expected that PCS carriers are able to build an environmentally-friendly communications infrastructure and reduce the cost by using unified PCS revealer and apply it for the deployment of IMT-2000 network.

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Experimental Test for Seismic Performance of PCS Structural System (PCS 구조 시스템의 내진 성능 분석)

  • Park, Soon-Kyu;Yeo, In-Seok
    • Journal of the Korea Concrete Institute
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    • v.19 no.3
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    • pp.313-322
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    • 2007
  • The PCS system, which consists of precast concrete column and steel beam, is a kind of composite structural systems. In this paper, experimental study has been conducted to analyze seismic performance of bolted beam-to-column connections for the PCS system. Based on experimental results from the seismic testing of eight interior PCS specimens, it shows that behavior of PCS system is satisfactory to seismic performance criteria of ACI such as strength deterioration, stiffness degradation and energy dissipation capacity except initial stiffness. All of the specimens maintain their strength at large levels of story drift without significant loss of stiffness and show high ductility level for inelastic behavior. The energy dissipation capacity is two times greater than requirement of ACI criterion. But the initial stiffness of all specimens does not satisfy ACI criterion, and this phenomenon is similar to the other composite structural systems such as RCS, CFT system.

Expression of Arabidopsis Phytochelatin Synthase 2 Is Too Low to Complement an AtPCS1-defective Cad1-3 Mutant

  • Lee, Sangman;Kang, Beom Sik
    • Molecules and Cells
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    • v.19 no.1
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    • pp.81-87
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    • 2005
  • Phytochelatins play an important role in heavy metal detoxification in plants as well as in other organisms. The Arabidopsis thaliana mutant cad1-3 does not produce detectable levels of phytochelatins in response to cadmium stress. The hypersensitivity of cad1-3 to cadmium stress is attributed to a mutation in the phytochelatin synthase 1 (AtPCS1) gene. However, A. thaliana also contains a functional phytochelatin synthase 2 (AtPCS2). In this study, we investigated why the cad1-3 mutant is hypersensitive to cadmium stress despite the presence of AtPCS2. Northern and Western blot analyses showed that expression of AtPCS2 is weak compared to AtPCS1 in both roots and shoots of transgenic Arabidopsis. The lower level of AtPCS2 expression was confirmed by RT-PCR analysis of wild type Arabidopsis. Moreover, no tissue-specific expression of AtPCS2 was observed. Even when AtPCS2 was under the control of the AtPCS1 promoter or of the cauliflower mosaic virus 35S promoter (CaMV 35S) it was not capable of fully complementing the cad1-3 mutant for cadmium resistance.

A Study on Mobility Management in PCS Networks (PCS 망에서의 이동성 관리에 관한 연구)

  • 김현주;강경인;박경배;곽승욱;김현욱
    • Journal of the Korea Safety Management & Science
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    • v.1 no.1
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    • pp.145-157
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    • 1999
  • In this paper, a research on the structure and the network configuration of the location register(LR), which database of new locations and service informations of subscribers according to the movement of subscribers in personal communication system(PCS). since the traditional PCS manages all the databases with the location informations as a centralized type. The service informations of the subscribers are centrally controlled by the HLR. So there have been the heavy signal traffic and the call setup delay. In order to relieve such problem, the proposed types of the configurations are the distributed type of PCS scheme and the hierarchical PCS scheme. In the distributed scheme, each PCS has its own LR and in the hierarchical PCS scheme, several LR are grouped to from a layer so that overall structure is a tree style.

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Acceptance-Diffusion Strategies for Tablet-PCs: Focused on Acceptance Factors of Non-Users and Satisfaction Factors of Users

  • Kim, You-Jin;Sim, Jin-Bo
    • ETRI Journal
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    • v.34 no.2
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    • pp.245-255
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    • 2012
  • Among emerging devices propelling the growth of mobile devices, smartphones and tablet-PCs are among the most recognizable. In this study, a research model is designed for exploring acceptance-diffusion strategies for tablet-PCs from the viewpoint of consumer perception, which is verified through a survey. The results of this study show that tablet-PCs have great potential to be versatile, multifunctional devices, even though they are currently considered mostly as entertainment-oriented rather than fulfilling the essential needs of everyday life. An analysis of the acceptance model for tablet-PCs revealed that playability, cost level, functionality, and complexity significantly affect user acceptance. An analysis of the diffusion model, on the other hand, showed that playability and user interface have a significant influence on satisfaction, trust, and positive behavioral intention. We also found that cost level is not a major hindrance in the market diffusion of tablet-PCs. The results of this study can be used to establish effective acceptance and diffusion strategies for tablet-PCs and other emerging devices.