• Journal of Industrial Technology
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• v.25 no.B
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• pp.211-220
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• 2005

The wireless sensor network consists of a number of sensor nodes which have physical constraints. Each sensor node senses surrounding environments and sends the sensed information to Sink. The inherent vulnerability in security of the sensor nodes has promoted the needs for the lightweight security protocol. In this paper, we propose a non-hierarchical sensor network and a security protocol that is suitable for monitoring the man-made objects such as bridges. Furthermore, we present the efficient way of setting the routing path by storing IDs, MAC(message authentication code) and the location information of the nodes, and taking advantage of the two node states, Sleep and Awake. This also will result in the reduced energy consuming rate.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.11 no.3
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• pp.270-276
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• 2018

This paper presents a low area 256-point pipelined FFT architecture, especially for IEEE 802.16a WiMAX systems. Radix-24 algorithm and single-path delay feedback (SDF) architecture are adopted in the design to reduce the complexity of twiddle factor multiplication. A new cascade canonical signed digit (CSD) complex multipliers are proposed for twiddle factor multiplication, which has lower area and less power consumption than conventional complex multipliers composed of 4 multipliers and 2 adders. Also, the proposed cascade CSD multipliers can remove look-up table for storing coefficient of twiddle factors. In hardware implementation with Cyclone 10LP FPGA, it is shown that the proposed FFT design method achieves about 62% reduction in gate count and 64% memory reduction compared with the previous schemes.

• Journal of the Korean Institute of Telematics and Electronics
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• v.25 no.1
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• pp.101-107
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• 1988

This paper proposes a circuit extractor which extracts a netlist from the CIF input file cntaining the layout mask artwork informations. The circuit extractor extracts transistors and their interconnections, and calculates circuit parameter such as parasitic resistance and parasitic capacitance from the mask informations. When calculating the parasitic resistance, we consider the current flow path to reduce the errors caused by the resistance approximation. Similarly, we consider the coupling capacitance which has an effect on the circuit characteristics, when the parasitic capacitances are calculated. Therefore, using these parameter values as an input to circuit simulation, the circuit characteristics such as delay time can be estimated accurately. The presented circuit extraction algorithm uses a multiple storage quad tree as a data sturucture for storing and searching the 2-dimensional geometric data of mask artwork. Also, the proposed algorithm is technologically independent to work across a wide range of MOS technologies without any change in the algorihm.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.593-595
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• 2003

TV-Anytime은 차세대 디지털 방송을 위한 메타데이타 표준으로 XML 형식으로 기술된다. TV-Anytime 메타데이타는 그 특성상 단일 스키마를 따르며, 규모에 있어서 대용량이다. 그러므로 데이터베이스를 이용하여 메타데이타를 저장하고 관리할 필요가 있다. 본 논문에서는 대용량 TV-Anytime 메타데이타를, 데이터베이스를 이용하여 저장하고 관리하기 위한 저장 엔진을 제안한다. 단일 스키마에 기반을 두고 있다는 점을 고려하여 TV-Anytime 메타데이타의 구조에 적합한 데이터베이스 스키마를 설계하였다. 문서 재조합을 효율적으로 할 수 있도록 노드 번호를 위하여 Dewey 방법을 사용하였으며, 조인 연산을 줄이기 위하여 Path 테이블을 두었다. 저장 엔진은 TV-Anytime 관리 시스템에서 XQuery 엔진과 같은 XML 질의처리기와 연동될 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.11a
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• pp.377-380
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• 2006

최근 XML(eXtensible Markup language) 사용의 증가로 인해 다량의 대용량 XML 문서가 이용되고 있음에 따라, 효율적인 문서 관리를 위한 XML문서의 데이터 모델과 저장 스키마를 어떻게 구현할 것인가에 대한 연구가 활발히 진행되고 있다. 이에 본 논문에서는 관계형 데이터베이스를 기반으로 한 XML문서에 대한 효율적인 저장, 검색 및 관리 기법으로 노드의 텍스트 값이나 속성 값이 존재하는 경로만을 저장하고, 노드 표현에 따라 고유 노드명 식별자(Node Expression Identifier)를 부여함으로써 부여된 노드 식별자를 매칭하는 숫자 매칭(Number Matching)기법을 제안한다. 그리고 이를 입증하기 위해 WPath 질의들에 대한 처리 성능을 기존 방법과 비교함으로써 제안한 방법의 효율성을 제시한다.

• International conference on construction engineering and project management
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• 2015.10a
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• pp.669-670
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• 2015

Efficient management of the construction heavy equipment is required to reduce the rate of carbon emissions and on-site accidents. The intelligent excavation system (IES) will improve the construction quality and productivity through information technologies and efficient equipment operation, especially in large earthwork projects. Three-dimensional digitized ground data should be required for identifying the path of heavy equipment and work-site environment. Rapid development of terrain laser scanners (TLS) is more readily to acquire the digital data. This study suggests the '3D ground terrain processing platform (3DGTPP)' including data manipulating module and analyzing module of the scanned data for intelligent earthmoving equipment operation. The processing platform consists of six modules, including scanning, registering, manipulating, analyzing, transmitting, and storing. 3D ground terrain processing platform presented in this study will provide fundamental information for intelligent excavation system (IES), which will increase the efficiency of earthworks and safety of workers in significant.

• The KIPS Transactions:PartA
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• v.10A no.5
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• pp.439-452
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• 2003

Mobile agent is one of the good technologies for overcoming network load and latency in distributed applications, and it may be a promising way of base technology of distributed applications because of its high adaptability for various network environments. In this paper, a mobile agent programming system, called HUMAN, is designed and implemented efficient use in various distributed applications based on mobile agents. HUMAN supports such high level utilities as file searhing, addressing by groups of nodes, storing path information, storing search information, and thus it gives us high easiness in agent-based programming. And it provides various itinerary modes and flexible reply modes for easy adaptation to given network environment. It also provides a management server for registering and active agents. Thus it can be efficiently applied for such varous distributed applications as searching distributed information, remote control, and file sharing in networks. A simple electronic commerce system is designed is designed and implemented as a HUMAN based illustrative application.

• Journal of Korea Spatial Information System Society
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• v.9 no.3
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• pp.35-50
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• 2007

In a data centric sensor network, a sensor node to store data is determined by the measured data value of each sensor node. Therefore, if the same data occur frequently, the energy of the sensor node to store the data is exhausted quickly due to the concentration of loads. And if the sensor network is extended, the communication cost for storing data and processing queries is increased, since the length of the routing path for them is usually in the distance. However, the existing researches that generally focus on the efficient management of data storing can not solve these problems efficiently. In this paper, we propose a NUNS(Non-Uniform Network Split) method that can distribute loads of sensor nodes and decrease the communication cost caused by the sensor network extension. By dividing the sensor network into non-uniform partitions that have the minimum difference in the number of sensor nodes and the splitted area size and storing the data which is occurred in a partition at the sensor nodes within the partition, the NUNS can distribute loads of sensor nodes and decrease the communication cost efficiently. In addition, by dividing each partition into non-uniform zones that have the minimum difference in the splitted area size as many as the number of the sensor nodes in the partition and allocating each of them as the processing area of each sensor node, the NUNS can protect a specific sensor node from the load concentration and decrease the unnecessary routing cost.

• Journal of KIISE:Databases
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• v.37 no.2
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• pp.113-120
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• 2010

XML is broadly using for data storing and processing. XML is specified its structural characteristic and user can query with XPath when information from data document is needed. XPath query can process when the tern and structure of document and query is matched with each other. However, nowadays there are lots of data documents which are made by using different terminology and structure therefore user can not know the exact idea of target data. In fact, there are many possibilities that target data document has information which user is find or a similar ones. Accordingly user query should be processed when their term usage or structural characteristic is slightly different with data document. In order to do that we suggest a XML document ranking method based on path similarity. The method can measure a semantic similarity between user query and data document using three steps which are position, node and relaxation factors.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.12
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• pp.1033-1044
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• 2002

In this Paper, a new FRAM design technique utilizing grounded-plate PMOS-gate (GPPG) ferroelectric cell is proposed. A GPPG cell consists of a PMOS access transistor and a ferroelectric data storage capacitor. Its plate is grounded. The proposed architecture employs three novel methods for cell operation: 1) $V_{DD}$ -precharged bitline, 2) negative-voltage wordline technique and 3) negative-pulse restore. Because this configuration doesn't need the plate control circuitry, it can greatly increase the memory cell efficiency. In addition, differently from other reported common-plate cells, this scheme can supply a sufficient voltage of $V_{DD}$ to the ferroelectric capacitor during detecting and storing the polarization on the cell. Thus, there is no restriction on low voltage operation. Furthermore, by employing a compact column-path circuitry which activates only needed 8-bit data, this architecture can minimize the current consumption of the memory array. A 4- Mb FRAM circuit has been designed with 0.3-um, triple-well/1-polycide/2-metal technology, and the possibility of the realization of GPPG cell architecture has been confirmed.