• The Journal of Society for e-Business Studies
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• v.16 no.4
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• pp.17-31
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• 2011

Damage caused by private information breach causes serious problems and huge social losses. In order to make a better policy that prevents society from suffering from the damage, we have to know about the actual size of damage. So it is needed to develop a quantitative model of private information breach that helps catching the more accurate size of damage. In our study, we suggest a method which calculate not only the costs of damage from firms' perspective but also those from individual and social perspectives. In this process, we refer to methods adopted by JNSA(Japan Network Security Association) and Ponemon Research Institue and modify it with considering our current situation. Also we try to make a new model by using new methods(web traffic analysis, survey, indirect comparison, etc.) and verify it with theories and methods from econometrics, cost accounting and theory of producer.

• Journal of Navigation and Port Research
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• v.41 no.4
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• pp.243-250
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• 2017

Seaports are not longer considered to be single entities for which the main activity is to load and discharge cargo, but rather as fundamental hubs within a complex supply chain serving global production networks. From a public perspective, they hold a key role in terms of their economic impact at the local, regional and national level by generating value added activity and employment. This issue is becoming increasingly pivotal for ports and their stakeholders. The objective of the study is to estimate a regression model of the value added activity and employment figures of 17 Italian ports for which there are no publications available. Concerning port system reform in Italy, the research intends to provide policy makers with a tool to measure the effects produced by ports and their importance to local communities and regions. The paper finds that in all Italian ports, the direct effects are larger than the indirect effects, and the bigger socio-economic effects are found in the biggest ports.

• Journal of Korea Water Resources Association
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• v.36 no.4
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• pp.547-559
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• 2003

In this study, a mathematical model is developed for sewer rehabilitation planning by considering cost and inflow/infiltration. A sewer rehabilitation planning model is required to decide the economic life of the sewer by considering trade-off between cost and inflow/infiltration. And it is required to find the optimal rehabilitation timing, according to the cost effectiveness of each sewer rehabilitation within the budget. To solve the problem, we formulated a multiple objective mixed integer programming(MOMIP) model based on network flow optimization. The network is composed of state nodes and arcs. The state nodes represent the remaining life and the arcs represent the change of the state. The model considers multiple objectives which are cost minimization and minimization of inflow/infiltration. Using the multiple objective optimization, the trade-off between the cost and inflow/infiltration is presented to the planner so that a proper sewer rehabilitation plan can be selected.

• Journal of the Korean Institute of Gas
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• v.8 no.1 s.22
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• pp.30-36
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• 2004

Although the usage of gas as one of the most economical energy source is ever expanding, numerous gas accidents occur as a result of negligence in safety management. The main reason behind such accident is that the current safety control system relies heavily on the manual control mechanism. This paper designed and developed a prototype of a computerized gas safety control system that automates such critical functions as the alarm sensing and the valve control. Since the system is connected through a digital network, the control can be performed remotely. Most importantly, the accidental risk or damage can be greatly reduced since the system monitors and reacts actively to gas leakage in real time.

• Journal of Satellite, Information and Communications
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• v.7 no.2
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• pp.42-46
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• 2012

This paper analyses technical and economical conditions which activate the use of mobile communication spectrum not to limit the growth of mobile broadband service because of mobile big data traffic and proposes the method which activate the use of mobile communication spectrum. To activate new mobile communication spectrum the expenditure and income of investment should be balanced. The activation of new mobile communication spectrum to process mobile big data traffic depends on technical and economical conditions, internal and external factors of service provider. The investment expenditure is relate to CAPEX, OPEX which is internal factors of service provider and to spectrum price which is external factor of service. The investment income is relate to tariff system which is internal factors of service provider and to spectrum neutrality which is external factor of service provider. The activation of new mobile communication spectrum can be implemented when the investment expenditure and investment income meet the balance including the spectrum price in the investment expenditure and the tariff system which is able to extend network and the income based on traffic increase by external contents in the investment income.

• The KIPS Transactions:PartA
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• v.14A no.3 s.107
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• pp.159-166
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• 2007

A arrival of u-teaming paradigm requires many u-teaming system and model that is varied and support to distance education, Accordingly, the distance education system in u-learning environment has attracted a fair amount of critical attention. However there remain many questions, as yet unresolved, such as it is difficult to maintain interaction between tutor and learner, the construction of system is a great expense to them, a tutor, who manages the system, lacks technologic background, in most current distance education system. To solve these problem, some preliminary observations have to be made first: to keep teaming process in situation that it is unconnected with tutor, to construct the system economically, and to make to be easy-to-use. Therefore, in this paper, we develop the 'Intelligent U-Learning System using Cyber Tutor', which includes the conception of u-learning such as mobility, immanency, supports to keep learning without real tutor by cyber tutor, and removes technological and economical costs, verify the validity.

• Tunnel and Underground Space
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• v.26 no.3
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• pp.192-200
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• 2016

We analyzed the behavior of the lining segments considering the middle slab and lateral pressure coefficients when planning the construction of a duplex tunnel for the underground network. Reviewed segment lining analysis for research, the analytical model was determined for duplex tunnel. Also reviewed the vertical load, and a load of middle slab is considered the static load and the live load by vehicles. Section force by middle slabs a load applied was mainly generated in the lower tunnel had the greatest effect on the bending moment. In addition, the bending moment acting direction changes appeared with a large variable, and the section force according to the load applied to the middle slab is relatively constant and the effect on the segment lining from the smallest section force of the lateral pressure coefficient of 1.00 was found to occur appears most significantly. As a result of this research to identify the behavior of the slab and the segment lining by the effect of the lateral pressure coefficient (K) of the duplex tunnel will be able to present a method of the duplex tunnel structure is reasonable and economical design.

• Journal of Digital Convergence
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• v.17 no.10
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• pp.469-478
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• 2019

This study tried to analyse the factors to promote sport cooperatives as the solutions to overcome those problems of present sports industry. The results of this study By Using the priorities of AHP on promoting factors of sport cooperative in Korea, could be suggested as follows. In advance, the basic directions were suggested in order of economical, social, cultural, and institutional factors. And next, the promoting strategies were suggested as follows: 1st, setting directions on the essentials of cooperative. 2nd, securement of the finance by business management development and organization ability improvement. 3rd, acquaintance with the basic laws of cooperative and securement of administrative support. 4th, social contribution through cooperation and interaction among cooperatives. 5th, making local communities through constructing networks among cooperatives. 6th, development of business models with membership systematizing and efficiency pursuit.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.18-18
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• 2018

상수관망 시스템(Water Distribution System, WDS)은 이용자에게 양질의 상수도를 공급하기 위해 구축된 사회기반시설물로써, 정수된 물이 사용처에 도달하기까지 송수과정에서 발생 가능한 수질저하를 고려해야 한다. 일반적으로 정수장에서 염소처리를 한 후, 도달시간을 고려한 시스템 내 잔류 염소농도를 유지함으로써 수질저하를 예방한다. 여기서 상수도 내 잔류 염소농도는 미생물 번식 및 관내 부식물 등 다양한 생물 화학적 오염을 효과적으로 예방하는 반면, 과다할 경우 이용자의 음용성을 저해할 수 있어 시스템 전반에 걸쳐 염소농도의 적절한 관리가 요구된다. 특히, 상수관망에서는 공급경로 및 공급량에 따라 각 수요처의 도달 염소농도가 다르게 분포할 수 있으므로, 시설운영자는 균등하고 적절한 염소농도를 유지하기 위해 추가적인 염소 재투입시설을 설치하여 함께 관리하고 있다. 이 때, 염소투입 시설의 운영계획은 EPANET과 같은 상수관망 해석모형의 수질모의를 바탕으로 수립된다. 그러나 일반적으로 수질모의는 수리해석과는 달리 긴 시간이 소요되는 단점이 존재한다. 본 연구에서는 이러한 단점을 개선하기 위해, 특정 네트워크의 수질모의 결과를 학습시킨 인공신경망(ANN) 모형을 구축하고 이를 이용하여 상수관망 수질모의 계산시간을 단축하고자 하였다. 여기서 ANN모형의 학습은 EPANET을 통해 미리 선정된 다양한 염소 투입지점의 염소 투입농도와 용수 공급량 자료, 그리고 주요 관측지점에서 측정된 염소농도자료를 이용하였다. 학습된 ANN모형을 EPANET 수질모의 결과와 비교 및 검증을 실시한 결과, 사전에 소요된 학습시간을 제외하면 수질모의 소요시간 측면에서 큰 개선효과를 보였으며, 대표지점에서의 수질모의 결과가 유사하였다. 추가적으로, 본 연구에서는 학습된 ANN모형과 최적화 알고리즘인 GA(Genitic Algorithm)를 연계하여 상수관망에서의 염소 재투입 스케줄링을 최적화하는 프로그램을 개발함으로써, 안전하고 경제적인 상수관망의 수질운영에 기여하고자 하였다.

• The Southeast Asian review
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• v.21 no.1
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• pp.217-248
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• 2011

이 글은 싱가포르에 거주하는 한국인 기혼 여성을 대상으로 영구 이민이 아닌 체류이주 맥락에서 일과 가족 양립 문제의 어려움과 그 대응전략을 살펴보는 탐색적 질적 연구이다. 지난 십여 년간 꾸준히 증가한 해외 거주 한국인 중장기 체류자(sojourner)의 수는 2007년 기준으로 1백5십만 명을 넘어섰다. 그 중 상당수는 한국계 기업 파견 직원('주재원')이나 비한국계 다국적기업 혹은 현지기업 종사 이주자로 파악된다. 고학력 전문 기술직 이주자(highly educated professional/high skilled migrant)에 대한 연구가 매우 드문 한국의 맥락에서, 전문 기술직 체류자 중심으로 이주 한국인 사회가 구성된 싱가포르는 전문 기술직 이주자의 일과 가족 양립 문제뿐만 아니라, 체류자 사회(expatriate community) 전반적인 연구의 중요한 대상지로서의 장점이 크다. 연구 질문은 다음과 같다. 체류자로서 외국에서 일하며 살아가는 어려움은 무엇인가? 특히, 이러한 맥락에서 기혼 여성의 일은 어떠한 의미를 지니며 어떠한 대응전략을 마련하는가? 이 연구는 2006년부터 2007년 사이 수행한 전일제 전문직종 종사자, 파트타임 종사자, 전업주부 등 자녀를 둔 26명의 기혼 여성에 대한 심층면접 자료에 근거하여, 아내이자 어머니로서의 일과 가족 양립에 관한 체험적 경험(lived experience)을 탐색적으로 파악하였다. 연구결과는 다음과 같다. 전일제 전문직 종사자의 경우 가정친화적 근무 환경을 갖춘 직장으로의 이직, 남편과의 야간근무 조정 등을 포함한 다양한 전략들을 채택하였다. 파트타임 종사자의 경우 과거 한국에서 전일제 근무를 경험하고 현재 상대적으로 경제적 여유가 있는 경우는 전일제 근무로부터 벗어나는 '일시적 행복감'을 느끼는 경우가 많았다. 비교적 경제적 여유가 없는 경우, 어머니 역할 부족을 발견하는 계기가 되기도 했다. 이러한 어머니로서의 역할은 친지를 비롯한 한국어 구사를 할 수 있는 가사 보조 네트워크가 결핍된 체류이주 맥락에서 일하며 살아가는 것에서 있어, 비교적 쉽고 저렴하게 가사노동자를 고용하더라도, 어머니로서의 역할을 보조하는 데 큰 도움이 되지 않는다는 생각을 확인시켜준다.