• Title/Summary/Keyword: Network adjustment

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Ethnographic Research on Adjustment of Mothers Caring for their Cancer Children in Korea (암환아 어머니의 돌봄 적응에 관한 일상생활기술적 연구)

  • Kim, Seong-Heui;Yoo, Eun-Kwang
    • Women's Health Nursing
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    • v.21 no.3
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    • pp.216-231
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    • 2015
  • Purpose: The purpose of this study is to provide the basic data to develop the effective nursing intervention for the parent who have children with cancer by acquiring the deeper understanding of the mothers' adjustment of caring for their children with cancer. Methods: The ethnographic research method was used to find out the pattern of caring adjustment in Korean cultural context. Informants consisted of 12 mothers who were caring for their children with cancer. The data were collected using in-depth interviews, participant observation, and telephone interviews by maximum variation purposive sampling. The data were analyzed following Spradley's methodology. Results: The mothers' caring adjustment were organized into one cultural theme, four categories, and twelve properties. The cultural theme was 'standing alone as a mother with sin'. The four categories were 'blaming for falling illness', 'overcoming with motherhood', 'desperate struggling with side effects', and 'establishing new network as a dependent'. Conclusion: For the mothers who are caring children with cancer, the supportive nursing intervention based on the deeper understanding of mothers' pattern of caring adjustment for their children and centered on facilitating effective adjustment in each cultural context especially from the very early stage of caring in the hospital ward is extremely required.

Analysis of Pointer Adjustment Jitter Generated in Degraded Mode with Computer Simulation (비정상인 모드에서 발생되는 포인터조정지터의 컴퓨터 시뮬레이션에 의한 분석)

  • Choe, Seung-Guk
    • The Transactions of the Korea Information Processing Society
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    • v.2 no.4
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    • pp.561-566
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    • 1995
  • In the degraded mode, there is frequency-misalignment between the node clocks in a synchronous network. Therefore the phase differences between node clocks fluctuate greatly. To keep the phase difference under allowable level the pointer adjustment technique is used Unfortunately these processes cause an inherent pointer adjustment jitter, that accumulates in a chain of pointer adjustment systems. To analyze the jitter, computer simulation is carried and the results is compared with experimental jitter values.

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A Dynamic Backoff Adjustment Method of IEEE 802.15.4 Networks for Real-Time Sporadic Data Transmission (비주기적 실시간 데이터 전송을 위한 IEEE 802.15.4 망의 동적 백오프 조정 기법에 대한 연구)

  • Lee, Jung-Il;Kim, Dong-Sung
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.3
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    • pp.318-325
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    • 2008
  • In this paper, a dynamic backoff adjustment method of IEEE 802.15.4 is proposed for time-critical sporadic data in a noisy factory environment. For this, a superframe of IEEE 802.15.4 is applied to a real-time mixed data (periodic data, sporadic data, and non real-time message) transmission in factory communication systems. To guarantee a channel access of real-time sporadic(non-periodic) data, a transmission method using the dynamic backoff is applied to wireless control networks. For the real-time property, different initial BE, CW parameters are used for the dynamic backoff adjustment method. The simulat-ion results show an enhancement of the real-time performance of sporadic emergency data. The proposed method provides the channel access of real-time sporadic data efficiently, and guarantee real-time transmission simultaneously within a limite-d timeframe.

Different QoS Constraint Virtual SDN Embedding under Multiple Controllers

  • Zhao, Zhiyuan;Meng, Xiangru;Lu, Siyuan;Su, Yuze
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.12 no.9
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    • pp.4144-4165
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    • 2018
  • Software-defined networking (SDN) has emerged as a promising technology for network programmability and experiments. In this work, we focus on virtual network embedding in multiple controllers SDN network. In SDN virtualization environment, virtual SDN networks (vSDNs) operate on the shared substrate network and managed by their each controller, the placement and load of controllers affect vSDN embedding process. We consider controller placement, vSDN embedding, controller adjustment as a joint problem, together considering different quality of service (QoS) requirement for users, formulate the problem into mathematical models to minimize the average time delay of control paths, the load imbalance degree of controllers and embedding cost. We propose a heuristic method which places controllers and partitions control domains according to substrate SDN network, embeds different QoS constraint vSDN requests by corresponding algorithms, and migrates switches between control domains to realize load balance of controllers. The simulation results show that the proposed method can satisfy different QoS requirement of tenants, keep load balance between controllers, and work well in the acceptance ratio and revenue to cost ratio for vSDN embedding.

Neural network based tool path planning for complex pocket machining (신경회로망 방식에 의한 복잡한 포켓형상의 황삭경로 생성)

  • Shin, Yang-Soo;Suh, Suk-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.7
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    • pp.32-45
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    • 1995
  • In this paper, we present a new method to tool path planning problem for rough cut of pocket milling operations. The key idea is to formulate the tool path problem into a TSP (Travelling Salesman Problem) so that the powerful neural network approach can be effectively applied. Specifically, our method is composed of three procedures: a) discretization of the pocket area into a finite number of tool points, b) neural network approach (called SOM-Self Organizing Map) for path finding, and c) postprocessing for path smoothing and feedrate adjustment. By the neural network procedure, an efficient tool path (in the sense of path length and tool retraction) can be robustly obtained for any arbitrary shaped pockets with many islands. In the postprocessing, a) the detailed shape of the path is fine tuned by eliminating sharp corners of the path segments, and b) any cross-overs between the path segments and islands. With the determined tool path, the feedrate adjustment is finally performed for legitimate motion without requiring excessive cutting forces. The validity and powerfulness of the algorithm is demonstrated through various computer simulations and real machining.

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Study On Generating Compact Network RTK Corrections Considering Ambiguity Level Adjustment Among Reference Station Networks for Constructing Infrastructure of Land Vehicle (육상교통 인프라 구축을 위한 다중 네트워크 간 미지정수 수준 조정이 고려된 Compact Network PTK 보정정보 생성기법 연구)

  • Song, June-Sol;Park, Byung-Woon;Kee, Chang-Don
    • Journal of Advanced Navigation Technology
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    • v.17 no.4
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    • pp.404-412
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    • 2013
  • Network RTK is widely used especially for static applications so far, however, the demand for high accuracy positioning for kinetic users such as land vehicles is growing for safety and convenience reasons. Kinematic users move along the roads and the network where they receive corrections can be changed. Compact Network RTK corrections should keep consistency while network change. In this paper, we introduced a method of generating Compact Network RTK corrections considering network ambiguity level adjustment by formulation of corrections. We verified the proposed method for reference station networks across whole country. We also generated Compact Network RTK corrections using simulation and real GPS data from reference stations in South Korea and evaluated performance of users. As a result, the discontinuity between corrections from two networks reduced to 0.25 cycle from several cycles. And user could achieve less than 8 cm (2DRMS) horizontal position accuracy continuously regardless of network change.

Simultaneous Adjustment of the Korea Precise Primary Geodetic Network by Development Method (우리 나라 정밀측지망(精密測地網)의 동시조정(同時調整))

  • Choi, Jae Hwa;Choi, Yun Soo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.13 no.1
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    • pp.151-159
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    • 1993
  • In conjunction with a vertical network. horizontal geodetic control points provide the basic framework for topographic mapping and legal survey. The design of such networks as well as the technical means for obtaining their coordinates have been changed in time, and therefore Korea National Geographic Institute has planned and observed the precise geodetic network since 1975. The aim of this study is to investigate the systematic distortions of the precise geodetic network in Korea implementing by the simultaneous adjustment. The results show that there are large discrepancies between adjusted and public coordinates in Chun-nam and Kyung-buk areas. The coordinate discrepancies are mainly due to the non-rigorous adjustment method and the disregard of the orientation unknown of the first direction for some blocks.

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A Study on Moldability Evaluation System in Injection Molding Based on Fuzzy Neural Network (퍼지 신경망을 이용한 성형성 평가 시스템에 관한 연구)

  • 강성남;허용정;조현찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.97-100
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    • 1997
  • In order to predict the moldability of a injection molded part, a simulation of filling is needed. Especially when short shot is predicted by CAE simulation in the filling stage, there are mainly three ways to solve the problem. Modification of gate and runner, replacement of plastic resin, and adjustment of process conditions are the main ways. Among them, adjustment of process conditions is the most economic way in the cost and time since the mold doesn\\`t need t be modified at all. But it is difficult to adjust the process conditions appropriately in no times since it requires an empirical knowledge of injection molding. In this paper, a fuzzy neural network(FNN) based upon injection molding process is proposed to evaluate moldability in filling stage and also to solve the problem in case of short shot. An adequate mold temperature is generated through the fuzzy neural network where fill time and melt temperature are taken into considerations because process conditions affect each other.

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Estimation of Concrete Strength Using Improved Probabilistic Neural Network Method

  • Kim Doo-Kie;Lee Jong-Jae;Chang Seong-Kyu
    • Journal of the Korea Concrete Institute
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    • v.17 no.6 s.90
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    • pp.1075-1084
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    • 2005
  • The compressive strength of concrete is commonly used criterion in producing concrete. However, the tests on the compressive strength are complicated and time-consuming. More importantly, it is too late to make improvement even if the test result does not satisfy the required strength, since the test is usually performed at the 28th day after the placement of concrete at the construction site. Therefore, accurate and realistic strength estimation before the placement of concrete is being highly required. In this study, the estimation of the compressive strength of concrete was performed by probabilistic neural network(PNN) on the basis of concrete mix proportions. The estimation performance of PNN was improved by considering the correlation between input data and targeted output value. Improved probabilistic neural network was proposed to automatically calculate the smoothing parameter in the conventional PNN by using the scheme of dynamic decay adjustment (DDA) algorithm. The conventional PNN and the PNN with DDA algorithm(IPNN) were applied to predict the compressive strength of concrete using actual test data of two concrete companies. IPNN showed better results than the conventional PNN in predicting the compressive strength of concrete.

Network Distance Estimation Scheme with Virtual Topology and Local Adjustment Term (가상 토폴로지와 지역 조정 항을 이용한 네트워크 거리 추정)

  • Lee, Sang-Hwan
    • 한국IT서비스학회:학술대회논문집
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    • 2006.05a
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    • pp.241-248
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    • 2006
  • 네트워크 거리 (Network distance : 일반적으로 ping이나 traceroute 등으로 측정 가능한 round trip time 등 네트워크 상에서 패킷 전송 시간) 추정 기법은 인터넷상의 많은 응용프로그램들에서 유용하게 사용된다. 예를 들면 다수의 서버를 인터넷상에 설치하고자 하는 경우 사용자들 간의 네트워크 거리를 알고 있다면 서버와 사용자간의 왕복 전송 시간 (Round Trip Time)등을 최소화할 수 있도록 서버를 분산하여 설치하는 구성을 도출해 낼 수 있을 것이다. Peer to Peer 응용 프로그램들에서도 이 네트워크 거리 정보는 매우 유용하다. 기존에 존재하는 추정 기법들은 대부분 유클리드 공간 좌표 기반 기법들로서 유클리드 좌표 상의 거리가 실제 네트워크 거리와 유사하도록 유클리드 공간 좌표를 지정한다. 그러나 이런 방법들의 문제점은 인터넷 상의 네트워크 거리가 삼각 부등식을 만족하지 않는 경우가 존재하는 등 유클리드 공간의 기본적인 가정을 만족하지 못한다는데 있다. 이런 문제점 때문에 새로운 모델이 필요하고, 이 논문에서는 가상 토폴로지(Virtual Topology) 모델과 지역 조정 항 (Local Adjustment Term) 모델을 제시하고, 기본적인 성능 분석을 시도하였다.

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