• Transactions of the Korean Society of Automotive Engineers
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• v.23 no.1
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• pp.65-73
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• 2015

The ride quality has become a key component of not only design but car selling as the technology developed and the requirement of passengers grew up. Thus car industry invests lots of time and cost for the higher ride quality. The evaluation of the ride quality mainly is expressed by subjective element that drivers felt. In this paper, instead of the original transfer path analysis method, relatively new methods such as OPAX(Operational path analysis with eXogeneous inputs) and OTPA(operational transfer path analysis) are used for analyzing the main hindrance element of ride quality. With those new method, contribution rate of all paths that the vibration propagate along analyzed after driving test on the roads having different characteristic. The comprehensive hindrance elements of ride quality are deduced from the contribution rate and the improve experiment by changing one of hindrance elements for higher ride quality.

• The KIPS Transactions:PartC
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• v.15C no.3
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• pp.205-212
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• 2008

In the environment with multiple heterogeneous wireless sensor networks with a single point of sensed data collection or a gateway (GW), relay points (RPs) may be required for the energy efficient delivery of sensed data from static or mobile sinks to the GW. The optimal placement of RPs becomes an even more difficult problem if static sinks are dynamically added or the trajectory of mobile sinks can not be known in advance. In order to resolve this problem, we propose a mechanism to deploy RPs in a grid pattern and to use the tree-based relaying network for reducing the cost of the RP and for reducing the control overhead incurred by the route setup from sinks to the GW. For the performance evaluation of our proposed mechanism, we have carried out a numerical analysis on a single route setup from a sink to the GW and, for more general performance evaluations, ns-2 based simulations have been carried out. According to the performance evaluation results, our tree-based relaying network mechanism outperforms that based on AODV in terms of the data delivery time, the network service time and the control overhead.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.24 no.12
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• pp.935-942
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• 2014

The ride quality investigation is on-going topic in the car industry since its global standard has not evaluated and it is difficult to point out one part that hinders the ride quality. Since the traditional transfer path analysis that is widely used in car industry to investigate the ride quality requires a lot of test time to process the full data so that there are problems to conduct in industry. Based on these disadvantages, new approaches have developed such as OPAX(operational path analysis with eXogeneous inputs) and OTPA(operational transfer path analysis) for last decades. The OTPA only requires the operational data for evaluate the contribution of vibration sources and the OPAX has advantage of using parametric model to estimate the operating load and needs a minimum set of extra tests with excitation. In this paper, for evaluating the hindrance of ride quality two methods are used and the result is compared with another result of a car having higher ride quality.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.782-788
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• 2008

In this paper, a comparison about two representative Transfer Path Analysis(TPA) methods for air-borne noise based on, matrix inversion method and pressure transmissibility, are presented on the view point of crosstalk effect between sources. In order to assess accuracy of two methods according to path models between virtual airborne noise sources, experiments are made for two cases, weak and strong crosstalk effect condition, by using acrylic vehicle model. Based on this assessment, the paper presents a reasonable application criteria for TPA method according to the circumstances of air-borne noise sources.

• Asia Marketing Journal
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• v.8 no.3
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• pp.1-11
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• 2006

The Bass model assumes two communication channels: mass-media and word-of-mouth. In this paper, we call the mass-media Type I channel of communications. The word-of-mouth channel means interaction between non-adopters and adopters. Let us call it Type II channel of communications. In the real world, however, the non-adopters who are not aware of the innovation can be affected by communications with other non-adopters who are aware of it. Let us call it Type III channel of communications to differentiate with Type II channel. This paper analyzes the impact of Type III channel on diffusion process. The result shows that exponential growth patterns (for example, the adoption patterns of the blockbuster movies) can be observed when non-adopters are influenced by other non-adopters who aware of the innovation.

• Proceedings of the Korean Society of Computer Information Conference
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• 2009.01a
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• pp.77-84
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• 2009

Intracellular signal transduction is achieved by protein-protein interaction. In this paper, we suggest performance algorithm based on Yeast protein-protein interaction and protein location information. We compare if pathways predicted with high valued weights indicate similar tendency with pathways provided in KEGG.

• Electronics and Telecommunications Trends
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• v.31 no.5
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• pp.99-109
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• 2016

IETF Path Computation Element(PCE) 그룹에서는 데이터 전송을 위한 전달 경로를 찾는 엔진 기능을 중심으로 표준화를 진행하고 있다. 망의 상태, 위상, 자원 가용성, 정책을 기반으로 최적의 자원을 할당하는 경로 계산 기능과 구조, 프로토콜 등을 정의하는데 MPLS/GMPLS 망의 제어 평면 프로토콜 기반 전송을 위주로 출발하여 광, 회선 망에서의 적용과 서비스 표준이 실제 사례를 뒷받침하여 발전되었고 현재는 데이터 센터 네트워크, SDN, IoT 분야에서의 활용이 활발하게 논의되고 있다. 본고에서는 경로 계산 기능의 분산을 주요 목적으로 하여 이제는 범용의 전달망 관리 분야로 확대 적용되는 추세의 active stateful PCE와 Traffic Engineering Database (TED), Label Switched Path DB(LSP-DB), PCE Protocol(PCEP) 등을 포함한 관련 표준 현황을 살펴보고 향후 통합 전달망 제어 관리 진화 방향을 소개하고자 한다.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.18 no.9
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• pp.943-951
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• 2008

In this paper, the mathematical model on crosstalk effect between acoustic noise sources is presented. Based on this model, a theoretical value to quantitate crosstalk effect of sources can be defined on the authority of reverberation property of surrounding which sources are located, relative magnitudes of sources and phase deference between acoustic wave transferred from all of sources. In order to verify crosstalk effect factor, experiments are made for two cases, weak and strong crosstalk effect condition, by using toro representative transfer path analysis(TPA) methods.

• Journal of Plant Biotechnology
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• v.44 no.3
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• pp.264-270
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• 2017

Brassinosteroid (BR), a plant steroid hormone, plays a critical role in the growth and developmental processes through its canonical signaling and crosstalk with various internal and external signaling pathways. Recent studies have revealed the essential interplay mechanisms between BR and ABA during seed germination and early seedling establishment. However, molecular mechanisms for this important signaling crosstalk are largely unknown. To understand the crosstalk between BR-mediated signaling pathways and ABA functions during early seedling development, we carried out a comparative genome-wide transcriptome analysis with an Agilent Arabidopsis $4{\times}44K$ oligo chip. We selected and compared the expression patterns of ABA response genes in ABA-insensitive bes1-D mutant with wild type seedlings on which ABA was exogenously applied. As a result, we identified 2,353 significant differentially expressed genes (DEGs) in ABA-treated bes1-D and wild type seedlings. GO enrichment analysis revealed that ABA signaling, response, and metabolism were critically down-regulated by BR-activated signaling pathways. In addition, the genome-wide transcriptome analysis data revealed that BR-regulated signaling pathways were tightly connected to diverse signal cues including abiotic/biotic stress, auxin, ROS etc. In this study, we newly identified the molecular mechanisms of BR-mediated repression of ABA signaling outputs. Also, our data suggest that interplay among diverse signaling pathways is critical for the adaptive response of the plant to various environmental factors.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.22-24
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• 2002

이동 IP 망에서 이동 IP의 삼각 라우팅 문제를 해결한 최적경로 IP 라우팅 기법은이동 IPv6망에서의 이동성을 지원하는 기본 동작으로 되어있다. 본 논문에서는 이동 IP망의최적 경로 기법을 NBMA망에서의 NHRP를 이용한 단거리 터널설정 기법을 적용하여 그 성능을 평가하였다. 패킷 전달지연 시간 측면에서 기존 IP 라우팅 기법과 최적 경로에서의단거리 터널링 기법을 상호 비교하기 위하여 수학적 분석 및 모의실험을 수행하였다. 최적경로의 단거리 터널링 기법은 기존 IP 라우팅 방식보다 초기 데이터의 경우 종단간 전달 지연시간이 클 수 있으나 이후 패킷부터는 종단간 데이터 전달 지연시간이 대폭 개선됨을 확인하였다.