• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.1
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• pp.113-118
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• 2016

This study found that there are problems in sending mails at the postal service reception desks and proposes a system which transmits address information to POSNET(the terminals at post office reception) without the use of an additional security system based on address information which is stored in the terminals of mobile phones. The system proposed transforms the information of users into two-dimensional barcode(QR code) of the POSNET and a number of address information is texturized and transmitted to the POSNET with the use of how to read QR code and LAN such as bluetooth. When the system proposed is connected to the postal reception system, it can create and output mail addresses for mobile computers automatically and contribute to better performance for the post office reception clerks and better economic results.

• Journal of the Society of Naval Architects of Korea
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• v.29 no.1
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• pp.135-142
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• 1992

In the vibration analysis or submerged of floating bodies such as ship and offshore structures, the coupled system between structure and fluid satisfying the compatibility conditions on the wetted surface should be considered. It is well known that the hydroelastic analysis of structural vibration in contact with fluid can be solved by applying the finite element method to structure and the boundary element method to fluid domain. However such an approach is impractical, because fluid added mass matrix is fully coupled on whole wetted surface. To overcome this shortcoming, an efficient approach based on reanalysis scheme is proposed in this paper. The proposed method can be applied for cases with higher modes lacking 3-D reduction factor J as well as beam-like modes of marine structures. It is well known the traditional method using 2-D added mass and J-factor is good only for beam-like modes with reliable J values. The validity and the calculation efficiency of the proposed method are proved with numerical examples.

• Journal of Ocean Engineering and Technology
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• v.10 no.3
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• pp.74-82
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• 1996

수면상에 떠있는 2차원 물체에 작용하는 시간평균 표류력 및 표류모오멘트를 비점성 선형 포텐셜 이론을 사용하여 계산하는 방법에 대하여 검토하였다. 부유체 접수면상의 압력을 직접적분하여 구한 수평방향 표류력이 특정주파수 부근에서 음의 값을 보이고 있다. 이는 무한원방에서의 에너지 보전방법에 의한 표류력이 항상 양의 값을 취한다는 기존 이론과 상이하다. 본 논문에서, 이러한 차이가 부유체의 횡요 및 상하동요에 기인한 복원력의 성분과 횡요와의 연성효과에 의하여 발생하였음을 규명하였다. 이는 횡요가 있는 경우, 표류력을 산출하는 기존의 무한원방 방법에 결함이 있음을 보이고 있다. 이에 반하여 기존의 접수면압력 직접적방법은 부유체에 작용하는 시간평균 표류력 및 표류모오멘트를 모든 주파수에 대하여 정확하게 산출한다고 결론지울 수 있다.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2939-2941
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• 2005

한전에서 핵심사업으로 구축된 신 배전정보 시스템은 전반적인 배전업무 수행은 물론, 전기고장신고 콜센터를 통한 복구처리 등 전력설비 기동보수와 같은 대고객업무에도 효과적으로 활용하고 있다. 하지만 콜센타에 의해 접수된 전기고장 정보와 이동중인 기동 보수차량 간에 시스템적인 연계가 불가능하여 이미 구축된 고장위치 도면정보, 설비속성 정보 등과 같이 복구에 필요한 정보를 현장에서의 활용이 어려운 실정이었다. 이러한 배경에서 기동보수 차량의 위치를 모바일 환경에서 상시 파악하여 고장지점으로 신속히 출동시키게 하고, 현장에서는 고장접수정보와 계통정보 등을 제공하여 고장설비를 신속 복구함으로서 고객서비스의 질을 높이기 위한 TRS 응용 시스템를 구현하고 그 결과를 기술하였다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.46 no.3
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• pp.176-179
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• 2001

To obtain the basic information of high yielding ability for varietal improvement and cultural practice, reciprocal grafts were made analyzed among five sweet potato cultivars. Five cultivars were characterized with the different in whose source and sink capacities. Grafting decreased main vine length, number of tuberous roots per plant, but its effects were different among grafting combinations. The growth of vines was affected more by scion, while growth and yield of under-ground were influenced more by stock. Grafting effects, interactions between stock and scion for main vine length and number of tuberous roots were highly significant in diallel grafting. The percentage of marketable tuberous roots was higher in the order of stem cutting＞self grafting＞reciprocal grafting.

• Korean Journal of Plant Resources
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• v.27 no.2
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• pp.183-187
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• 2014

Hovenia dulcis var. koreana Nakai, the oriental raisin tree, has been considered not only fruit but an herbal medicine in East Asia including Korea, Japan and east China. As honey plant, value of this species had been rising steadily. The aim of this study was conducted to develop the propagation technique by scion collection time, scion age and vinyl house on survival rate of H. dulcis. The survival rate by veneer grafting showed no significant differences among 3 new cultivars. The scion collection at the northern temperature zone was observed to be the most appropriate time before the spring equinox when the plants are fully dormant. Especially, the installation of vinyl house showed 86% survival rate by veneer grafting. The scion age was effective 1 year shoot than 2 years shoot for increase the grafting survival rate. In this case, the installation of vinyl house can contribute above 80%.

• The Journal of the Korea Contents Association
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• v.10 no.11
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• pp.189-197
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• 2010

The purpose of this study is to promote efficiency of hospital management with customer satisfaction by understanding qualitative system about more systemic hospital service coordinator's job under analyzing the satisfactory degree and coherence of hospital service coordinator's job because of increase of customer need level by medical environment improvement and the variety of offering method of medical service. I allocated a questionnaire per each dental clinic at total 226. According to the study results stated above, generally necessity on employment of a coordinator appeared high and to the necessity, I considered that a dental clinic coordinator's job must strengthen the role for going still more to customer with discriminated mind and service not simple kind service to medical consumer, with establishing more systematic and realistic educational culture in qualification and educational department of a dental coordinator. Also a dental coordinator must be changed to promote customer satisfaction and efficiency of hospital management by more systematic business assignment and role establishment.

• Journal of the Society of Naval Architects of Korea
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• v.40 no.6
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• pp.80-87
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• 2003

Tank structures in ships are in contact with various fluid. The vibration characteristics of those structures are strongly affected by the added mass due to containing fluid. It is important to predict vibration characteristics of tank structures, but it is difficult to do. That's because the interaction problem concerned with the free surface, the variation of water depth and stiffener is to be considered between the fluid and the structure. Many authors have studied vibration of rectangular tank structures containing water. Kito studied added mass effect of water in contact with thin elastic flat plates. Kim et al. studied flexural vibration of stiffened plates in contact with water. However, few researches on dynamic interaction tank walls with water are reported in the vibration of rectangular tanks recently. in the present report, the coupling effect of added mass of fluid and structural constraint between panels on each vibration mode changing breadth of elastic plate, and dynamic pressure distribution have investigated numerically and discussed.

• Journal of the Society of Naval Architects of Korea
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• v.60 no.1
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• pp.20-30
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• 2023

In this paper, the Energy Flow Finite Element Analysis (EFFEA) was performed to predict the acoustic and vibrational responses of complicated plate structures considering improved Fluid-Structure Interaction (FSI). For this, a new power transfer relationship was derived at the area junction where two different fluids are in contact on both sides of the plate. In order to increase the reliability of EFFEA of complicated plate structures immersed in a high-density fluid, the corrected flexural wavenumber and group velocity considering fluid-loading effect were derived. As the specific acoustic impedance of the fluid in contact with the plate increases, the flexural wavenumber of the plate increases. As a result, the flexural group velocity is reduced, and the spatial damping effect of the flexural energy density is increased. Additionally, for the EFFEA of arbitary-shaped built-up structures, the energy flow finite element formulation for the acoustic tetrahedral element was newly performed. Finally, for validation of the derived theory and developed software, numerical applications of complicated plate structures submerged in seawater or air were successfully performed.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.19 no.40
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• pp.321-327
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• 1996

Time phased reorder models for non-instaneous receipt was Presented in a recent paper [l]. This paper extends the models under learning effects and learning retention after breaks. The result of this model show that learning and learning retention significantly influence the amount of inventory and production lot size. Sample example demonstrate the application of the proposed methodology.