• Journal of Communications and Networks
• /
• v.8 no.4
• /
• pp.442-450
• /
• 2006

Inter-operability between heterogeneous radio access technologies (RATs), in the sense of seamless vertical han-dover (VHO) support with common radio resource management (CRRM) functionalities, has recently attracted a significant research attention and has become a prominent issue in standardization fora. In this paper, we formulate the problem of load balancing between cooperative RAT's as a mathematical program and by trading off a pre-defined delay tolerance per request we propose a vertical handover batch processing (VHBP) scheme. To quantify the performance of the proposed VHBP scheme we compare it with a baseline processing scheme, where each VHO request is processed independently under a number of different network scenarios. Numerical investigations reveal significant net benefits of the proposed scheme compared with the baseline, both in terms of achieved load balancing levels but also with regard to the acceptance rate of the VHO requests.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• v.2 no.1
• /
• pp.59-64
• /
• 2002

In the sender-initiated load balancing algorithms, the sender continues to send an unnecessary request message fur load transfer until a receiver is found while the system load is heavy. Meanwhile, in the receiver-initiated load balancing algorithms, the receiver continues to send an unnecessary request message for load acquisition until a sender is found while the system load is light. These unnecessary request messages result in inefficient communications, low CPU utilization, and low system throughput in distributed systems. To solve these problems, in this paper, we propose a genetic algorithm based approach fur improved sender-initiated and receiver-initiated load balancing. The proposed algorithm is used for new adaptive load balancing approach. Compared with the conventional sender-initiated and receiver-initiated load balancing algorithms, the proposed algorithm decreases the response time and increases the acceptance rate.

• Journal of the Korean Institute of Telematics and Electronics A
• /
• v.33A no.2
• /
• pp.23-31
• /
• 1996

This paper proposes a new UPC(usage parameter control) mechanism that varies the token generation rate of leaky bucket by observing virtual buffer, thus achieving an improvement of performance. An acceptance of a call in B-ISDN is determined by call admission control. A UPC that polices the agreed traffic parameters of a call and takes appropriate actions to prevent congestion in networks. The cell loss probability of conventional UPC is far from that of ideal UPC. The proposed mechanism has a better policing ability and response time for nonconforming call. The proposed mechanism uses ON-OFF model as input traffic. The results of simulation show the efficiency of the proposed mechanism.

• Advances in pediatric surgery
• /
• v.3 no.2
• /
• pp.126-132
• /
• 1997

Reduction of intussusception using air or oxygen has wide acceptance as an alternative to conventional hydrostatic reduction. This study was undertaken to evaluate the results and complications of air pressure enema in 948 pediatric intussusception. One hundred and twenty nine cases were operated on at the Department of Surgery, Masan Samsung Hospital from 1985 to 1996 because of air reduction failure. The success rate was 86.4 %. Twenty-one patients(2.2 %) showed perforation during air reduction. Risk prone factors of perforation were; age less than 3 months(42.9 % vs 11.1 %), duration of symptoms greater than 48 hours (66.7 % vs 33.3 %), and presence of pathologic leading point(28.6 % vs 3.7 %). Vomitting and spontaneous rectal bleeding revealed higher prediction to the complication. In nineteen cases, bowel infarction, coagulated necrosis and hemorrhage suggested that the cause of perforation was due to the preexisting strangulation. In conclusion, when doing an air pressure enema reduction, care must be taken if the patient is of a young age or the symptoms are of long duration.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
• /
• 2009.05a
• /
• pp.127-130
• /
• 2009

본 연구에서는 스마트 의류에 대하여 소비자들이 느끼는 지각된 가치가 소비자 수용도에 미치는 영향을 조사하고자 하였다. 이를 위해 MP3 기능 재킷과 심박 모니터링 스포츠웨어를 대상으로 소비자들의 수용도에 대한 연구모형을 수립하였고, 선행연구들을 근거로 각 구성요인 간의 관계에 대해 연구가설을 설정하였으며, 그 경로가설을 검증하였다. Davis(1989)가 제안한 TAM을 적용하여 스마트 의류의 수용과정을 설명한 결과 모형의 적합성을 검증하였으며, 8 개의 경로가설 중 6 개의 경로가 통계적으로 유의함이 밝혀져 채택되었다. 그 결과는, 첫째, 지각된 사용용이성은 유용성을 거쳐 태도에 간접적으로 영향을 주었고, 태도는 다시 수용의도에 영향을 주는 것으로 나타났다. 둘째, 지각된 유용성은 지각된 가치에 대한 태도에 영향을 주는 것으로 나타났으나, 스마트 의류의 수용의도에는 영향을 미치지 않는 것으로 분석되었다. 셋째, 지각된 가치가 스마트 의류에 대한 태도와 수용의도에 둘 다 영향을 미치는 것으로 나타났다. 넷째, 스마트 의류에 대한 태도는 구매의도에 영향을 미치는 것으로 나타났다.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.62 no.3
• /
• pp.312-321
• /
• 2013

In this study, we review the status of Southwest sea 2.5GW offshore wind project and expected various problems. And we suggest government policies for offshore wind industrialization. Especially, we would like to mention the necessity of offshore wind development in order to diversify power sources and guarantee energy security in Korea. And we would like to mention necessity and direction to make offshore wind into growth engine industry thorough fusion between industries and energization for the existing industry such as civil, shipbuilding, steel, etc. that was headed into downturn.

• Journal of Information Processing Systems
• /
• v.8 no.1
• /
• pp.85-100
• /
• 2012

The Hartley transform based feature extraction method is proposed for fingerprint matching. Hartley transform is applied on a smaller region that has been cropped around the core point. The performance of this proposed method is evaluated based on the standard database of Bologna University and the database of the FVC2002. We used the city block distance to compute the similarity between the test fingerprint and database fingerprint image. The results obtained are compared with the discrete wavelet transform (DWT) based method. The experimental results show that, the proposed method reduces the false acceptance rate (FAR) from 21.48% to 16.74 % based on the database of Bologna University and from 31.29% to 28.69% based on the FVC2002 database.

• Child Health Nursing Research
• /
• v.12 no.3
• /
• pp.398-404
• /
• 2006

Purpose: To investigate the rate of questionable development in infants born prematurely and explore factors affecting developmental delays. Method: The participants were 46 infants born prematurely being seen in one of two urban health centers. A questionnaire and the HOME checklist were used to collect data, and the Korean Denver II developmental screening test was administered. Results: Of the participants 21.7% were classified as having questionable development. The only variable with a significant difference between the two groups was acceptance　in the HOME checklist. Psychosocial factors such as mothers' burden, depression, family functioning, and social support were not significantly different between the two groups. Conclusion: An early developmental screening test for prematurely born infants is needed. Also, the childrearing environment was identified as a significant factor in infants' development. These findings suggest that HOME score might be useful for identifying infants at risk for developmental delays and interventions for these infants will probably be more effective if their mothers can provide a more appropriate social environment. Further studies are suggested with larger samples.

• Journal of Information Technology Applications and Management
• /
• v.17 no.2
• /
• pp.111-132
• /
• 2010

Korean telecommunications industry has a large scale market and boasts on high service quality and high technologies enough to provide the mobile video telephony service(the VTS) satisfactorily. For many years, Korean telecommunications companies have been investing enormous amount of money to advertise their VTS widely and to allow their customers to change their cell phones for the 3G(the third generation) devices indispensable for the VTS. However, despite their efforts, the VTS adoption rate in Korea is very low as of January, 2010 and it seems that customers seldom feel the necessity to use. From this viewpoint, it becomes necessary to identify antecedents influencing the intention to use for the VTS empirically. For this purpose, we have proposed several hypotheses from the perspective of the Value-based Adoption Model(VAM). We conducted a survey and found the several factors which influence the value perception of VTS.

• Journal of Information Processing Systems
• /
• v.13 no.4
• /
• pp.852-862
• /
• 2017

In this work a Discrete Cosine Transform (DCT)-based feature dimensionality reduced approach for fingerprint matching is proposed. The DCT is applied on a small region around the core point of fingerprint image. The performance of our proposed method is evaluated on a small database of Bologna University and two large databases of FVC2000. A dimensionally reduced feature vector is formed using only approximately 19%, 7%, and 6% DCT coefficients for the three databases from Bologna University and FVC2000, respectively. We compared the results of our proposed method with the discrete wavelet transform (DWT) method, the rotated wavelet filters (RWFs) method, and a combination of DWT+RWF and DWT+(HL+LH) subbands of RWF. The proposed method reduces the false acceptance rate from approximately 18% to 4% on DB1 (Database of Bologna University), approximately 29% to 16% on DB2 (FVC2000), and approximately 26% to 17% on DB3 (FVC2000) over the DWT based feature extraction method.