• Title/Summary/Keyword: Interference Management

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A prediction and distribution of Moors Applying to Environment Assesment Based on E-GIS (환경지리정보 기반의 환경평가 적용시 습지분포 및 규모예측)

  • Kwak, Young-Joo;Park, Sang-Yong;Kang, In-Joon
    • Journal of Korean Society for Geospatial Information Science
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    • v.13 no.3 s.33
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    • pp.53-57
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    • 2005
  • The moors ecosystem is sensitive environment change and weak in artificial interference. These nature property are very important to people. It is necessary to preservation and protection the moors with a countermeasure. We really need to Environment-GIS(E-GIS) using Geographical Information System(GIS) and digital map including range, correct position and attribute data of moors. In this study, we take priority of making a database of moors management. Taking effect an environment assesment, we concentrate on a standard method of digital map production and a preservation of moors in our research using GIS. Especially, we have to preserve our important national heritage using GIS when Environment Assesment is conducting under construction. We suggest to pre-estimated model of hidden moors as analysing terrain, geological feature, a geographical distribution of plants and animals using GIS.

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Blockchain E-voting System and Governance: The Case of Korean National Pension Service (블록체인 기술을 활용한 전자투표시스템과 지배구조: 국민연금 사례를 중심으로)

  • Chung, Hae Jin
    • The Journal of Society for e-Business Studies
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    • v.24 no.4
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    • pp.1-16
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    • 2019
  • Blockchain technology prevents tampering of central authorities that manage voting process, enhancing trust in the vote results. This technology enables citizens to participate more directly in the areas where delegation was inevitable due to the difficulties in polling fair and trustworthy public opinions. There are many projects around the world proposing to implement voting system for public decision making using blockchain technology. The blockchain voting system is expected to work as a transparent and fair channel for polling public opinions, which will transform the public decision-making process and governance. Korean National Pension Service (NPS) recently introduced stewardship code to better represent the interest of beneficiaries. However, because of the mistrust in governance of NPS, introduction of stewardship code is facing criticism for potential misuse of their voting rights against the interest of beneficiaries and for government's interference with corporate management. This study proposes a voting system applying blockchain technology for polling the opinions of National Pension Fund's beneficiaries to support public decision-making, and discusses social and institutional conditions for implementation of the proposed system.

Design and Implementation of Low Power Touch Screen Controller for Mobile Devices (모바일용 저전력 터치 스크린 제어 회로 설계 및 구현)

  • Park, Sang-Bong
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.12 no.6
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    • pp.279-283
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    • 2012
  • In is paper, we design and implement the low power, high speed touch screen controller that calculates and outputs the coordinate of touch point on the touch screen of mobile devices. The system clock is 10HMz, the number of input channels is 21, standby current is $20{\mu}A$, dynamic range of input is 140pF~400pF and the response time is 0.1ms/frame. It contains the power management unit for low power, automatic impedance calibration unit in order to adapt to humidity, temperature and evaluation board, adjacent key and pattern interference suppression unit, serial interface unit of I2C and SPI. The function and performance is verified by using FPGA and $0.18{\mu}m$ CMOS standard process. The implemented touch screen is designed for using in the double layer ITO(Indium Thin Oxide) module with diamond pattern and single layer ITO module for cost-effective which are applied to mobile phone or smart remote controller.

Development of A Biotelemetry System for A Totally Implantable Artificial Heart (완전이식 인공심장용 무선정보 전송장치의 개발)

  • Choi, Won-Woo;Kang, Dong-Woo;Park, Seong-Keun;Choi Jae-Soon;Kim, Hee-Chan;Min, Byoung-Goo
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.33B no.1
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    • pp.57-66
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    • 1996
  • In this paper, a new biotelemetry system for a transcutaneous data communication between an implanted artificial heart with a control system and an external human-interfaced management system has been developed. A radio telemetry using radio frequency is a commonly used method in the conventional telemetry systems. But, it is not suitable for the medical applications because of not only an interference due to a radio broadcasting but also a harmfulness to the human body. In this paper, therefore, a new biotelemetry system applied to an artificial heart has been developed with the results of the recent research for an optical telemetry system based on the infrared light transmission with good skin permeability. The performance of the biotelemetry system developed has been assessed through mock circulatory experiments, and the clinical applicability has been also confirmed with the successful results in the animal experiments.

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A Study on Positive Effect affecting Medical Development with Integration of Oriental-western Medicine in China (최근 중국의 중.서의 결합에 관한 연구 -- 의학발전에 미치는 긍정적인 영향을 중심으로 --)

  • Lee, Jun-Mu;Lee, Seon-Dong
    • The Journal of Korean Medicine
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    • v.17 no.2 s.32
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    • pp.17-33
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    • 1996
  • Chinese medical science with long history has experience and theory of cure and prevention as well as the perfect different system with western medicine. Western medical science also was introduced in recent times and has been used in fast development in China extensively. Therefore only China that coexist oriental and western medicine is used the term, the integration of oriental and western medicine. Its object is to make better treatment and prevention value with utilizing their strong point and weak point. That is, its great principle is to develop through interchange together without interference in the other science. For mutual growth of both medical science, national concern and support, medical staffs, administrative system and a lot of fruits, etc should be arranged simultaneously. This paper was obtained the as follows. 1. The system of public health administration is composed a sanitary department for a western medicine and a managing agency for a chinese one in the center. There are each local organization under the control both agency in the locality 2. The importance of the integration of chinese and western medicine is to get the merit of special chinese system through the interchange of both medicine and union with modem science and chinese pharmacy. 3. It is the long term and great project. So its important study field is illness treatment and cure, oriental medical remedy and theory, acupuncture and moxibution etc. 4. It makes steady progress in all the healthy medical field. It has studied its foundation, the education of medical staffs, scientific study and strengthening of skill management considerably. 5. The products are the development of new chinese medicines and many researches about traditional chinese medical science. In brief, the integration of chinese and western medical science is the historical stream. Besides it will contribute toward the cure and prevention of human illness for future 21 century.

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Relation with Activity of Road Mobile Source and Roadside Nitrogen Oxide Concentration (도로이동오염원의 활동도와 도로변 질소산화물 농도의 관계)

  • Kim, Jin Sik;Choi, Yun Ju;Lee, Kyoung Bin;Kim, Shin Do
    • Journal of Korean Society for Atmospheric Environment
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    • v.32 no.1
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    • pp.9-20
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    • 2016
  • Ozone has been a problem in big cities. That is secondary air pollutant produced by nitrogen oxide and VOCs in the atmosphere. In order to solve this, the first to be the analysis of the $NO_x$ and VOCs. The main source of nitrogen oxide is the road mobile. Industrial sources in Seoul are particularly low, and mobile traffics on roads are large, so 45% of total $NO_x$ are estimated that road mobile emissions in Seoul. Thus, it is necessary to clarify the relation with the activity of road mobile source and $NO_x$ concentration. In this study, we analyzed the 4 locations with roadside automatic monitoring systems in their center. The V.K.T. calculating areas are set in circles with 50 meter spacing, 50 meter to 500 meter from their center. We assumed the total V.K.T. in the set radius affect the $NO_x$ concentration in the center. We used the hourly $NO_x$ concentrations data for the 4 observation points in July for the interference of the other sources are minimized. We used the intersection traffic survey data of all direction for construction of the V.K.T. data, the mobile activities on the roads. ArcGIS application was used for calculating the length of roads in the set radius. The V.K.T. data are multiplied by segment traffic volume and length of roads. As a result, the $NO_x$ concentration can be expressed as linear function formula for V.K.T. with high predictive power. Moreover we separated background concentration and concentrations due to road mobile source. These results can be used for forecasting the effect of traffic demand management plan.

Slective Buffering Macro Handover Which Applies The F-SNOOP in Hierarchical structure (계층 구조에서 F-SNOOP을 적용한 선택적 버퍼링 매크로 핸드오버)

  • Ahn Chi-Hyun;Kim Dong-Hyun;Kim Hyoung-Chul;Ryou Hwang-Bin;Lee Dae-Young;Jun Kye-Suk
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.5B
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    • pp.413-420
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    • 2006
  • HMIPv6 is designed to reduce the signaling load to external network and improve handover speed of MN by including Mobility Anchor Point(MAP) in local handover. However in this case of macro handover, it's just used pervious MIPv6 handover algorithm. So, it occurs packet loss and transmission delay problem. In this paper, we propose the mechanism applying the HMIPv6 for Fast Handover to choose suitable to the condition buffering handover. The condition for the selection is result distance measurement between MN and CN, between MN and NAR. Furthermore, using F-SNOOP protocol, it is possible to improve wireless network performance. Wireless network has high Bit Error Rate(BER) characteristic because of path loss, fading, noise and interference. TCP regards such errors as congestion and starts congestion control. This congestion control makes packet transmission rate low. However, F-SNOOP improves TCP performance based on SNOOP and Freeze TCP that use Zero Window Advertisement(ZWA) message when handoff occurs in wireless network.

MADF: Mobile-Assisted Data Forwarding for Wireless Data Networks

  • Xiaoxin;Gary, Shueng-Han;Biswanath;Bharat
    • Journal of Communications and Networks
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    • v.6 no.3
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    • pp.216-225
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    • 2004
  • In a cellular network, if there are too many data users in a cell, data may suffer long delay, and system's quality-of-service (QoS) will degrade. Some traditional schemes such as dynamic channel-allocation scheme (DCA) will assign more channels to hot (or overloaded) cells through a central control system (CC) and the throughput increase will be upper bounded by the number of new channels assigned to the cell. In mobile-assisted data forwarding (MADF), we add an ad-hoc overlay to the fixed cellular infrastructure and special channels-called forwarding channels- are used to connect mobile units in a hot cell and its surrounding cold cells without going through the hot cell's base station. Thus, mobile units in a hot cell can forward data to other cold cells to achieve load balancing. Most of the forwarding-channel management work in MADF is done by mobile units themselves in order to relieve the load from the CC. The traffic increase in a certain cell will not be upper bounded by the number of forwarding channels. It can be more if the users in hot cell are significantly far away from one another and these users can use the same forwarding channels to forward data to different cold neighboring cells without interference. We find that, in a system using MADF, under a certain delay requirement, the throughput in a certain cell or for the whole net-work can be greatly improved.

Better Analysis of Lower Bounds of Frequency Assignment Problems in Wireless Networks with Cellular Topology (셀룰러 위상구조 무선망에서의 주파수 할당 문제의 향상된 하한 값 분석)

  • Lee, Sang-Kyu;Lee, Ju-Young
    • Journal of KIISE:Computer Systems and Theory
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    • v.33 no.11
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    • pp.830-835
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    • 2006
  • Because of its exponential growth of data and voice transmissions through wireless communications, efficient resource management became more important factor when we design wireless networks. One of those limited resources in the wireless communications is frequency bandwidth. As a solution of increasing reusability of resources, the efficient frequency assignment problems on wireless networks have been widely studied. One suitable approach to solve these frequency assignment problems is transforming the problem into traditional graph coloring problems in graph theory. However, most of frequency assignments on arbitrary network topology are NP-Complete problems. In this paper, we consider the Chromatic Bandwidth Problem on the cellular topology wireless networks. It is known that the lower bound of the necessary number of frequencies for this problem is $O(k^2)$. We prove that the lower bound of the necessary number of frequencies for the Chromatic Bandwidth Problem is $O(k^3)$ which is tighter lower bound than the previous known result.

A study on RFID Middleware protocol for management of sensor node and network implementation in Ubiquitous environment (유비쿼터스 환경에서 센서 노드의 관리와 망 구성을 위한 RFID 미들웨어 프로토콜에 관한 연구)

  • Choi, Yong-Sik;Kim, Sung-Sun;Shin, Seung-Ho
    • Journal of the Korea Society of Computer and Information
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    • v.12 no.3
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    • pp.155-163
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    • 2007
  • In this paper, Though sensors of Ubiquitous Middle-ware System based on RFID/USN can usually be reacted from six mouths to two years, they can be exhausted their power of storage battery only one day by communication rates and ranges. That is, the lifetime of sensor node is depended on how much spending power under wireless communication that can communicate its sensing data to its destination. Therefore, it is necessary that each sensor should be designed the Routing path to its destination, in order to remote collecting data. But, in order to improve lifetime of sensor node and modify inner setting, it is opposite to simple searching path method of sensor node by entering external commands. accordingly, 1:n sensor arrangement of n form command and data send-receive that is possible simulation do without interference other sensors and research to different sensor data analysis and conversion ways to convert Sensing data that accept from sensors to actuality information.

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