• Journal of Korean Ophthalmic Optics Society
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• v.13 no.1
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• pp.21-26
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• 2008

Purpose: To investigate the proper care system of sample-wearing cosmetic contact lens (SWCCL). Methods: Research on the actual condition about SWCCL was examined in fifty cosmetic contact lens wearer in their 10s and 20s by the questionnaire. Also, the extents of the contamination of gram-negative bacteria and fungi were measured in SWCCL after wearing for 2, 4 and 6 weeks, and it was investigated whether the proper care system could prevented the contamination. Results: As the result of the questionnaire, people purchased the cosmetic contact lens after trying SWCCL with a mean of 4.5. The contamination of gram-negative bacteria and fungi were significantly increased in SWCCL-wearing period-dependent manner. In both Group 1 (rubbing SWCCL and exchanging preserving solution every wearing of SWCCL) and Group 2 (only exchanging preserving solution every wearing of SWCCL without rubbing SWCCL), the contamination of gram-negative bacteria and fungi were prevented perfectly. In the case of Groups having every-week care, the proliferation of gram-negative bacteria and fungi were somewhat suppressed, and rubbing was helpful of decreasing the contamination. The biweekly care had scarcely any effect for preventing the contamination. Conclusions: By exchanging the preserving solution every wearing of SWCCL, the contamination of gram-negative bacteria and fungi could be suppressed perfectly.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.34 no.4
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• pp.98-105
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• 2011

수리가능 제품은 가격 비싸고 중요성이 크면서 새 제품을 구매하기 어려운 부품을 의미하며, 항공기 또는 선박의 엔진 등을 들 수 있다. 수리가능 제품에 대하여 고장이 발생할 경우 가용성을 유지하기 위하여 즉지 교체하여야 하고, 교체된 부품은 수리에 들어가야 한다. 이러한 문제에 대한 통제 시스템은 시스템의 효율성을 결정하는 중요한 요소이기 때문에, 다양한 시스템 구성에 대하여 많은 연구가 이루어져 왔다. 본 연구에서는 우선 중앙 수리기지와 여러 지역 수리기지를 대상으로 하고 있으며, 물류량의 변화에 따라 중앙 수리기지와 지역 수리기지 간의 효과적인 운영 방안을 고려하고 있다. 각 지역 수리기지는 수리 운영 능력이 제한되어 있는 것으로 가정하고 있으며, 한정된 수의 여분의 제품을 유지하고 있다. 중앙 수리기지는 여분을 제품을 보유하거나 유지하지 않고 오직 수리 작업만을 수행하고 있다. 유한 가동에 대한 효율적인 알고리즘은 이러한 상황에 대하여 운영 능력의 한계를 고려하면서 효율성을 최대화하기 위하여 개발되었다. 지역 수리기지에서는 제품의 고장이 발생하는 속도와 현재 보유한 제품 수량에 따라 효율성이 바뀌고, 시스템이 보유할 수 있는 재고량과 수리할 수 있는 능력의 한계가 제한되어 있다. 대기행렬이론에 기반하여 고장율과 수리율에 의한 비용 함수를 정의하고, 최적해를 구할 수 있는 IMES(지능형 다단물류 시스템)을 개발하였다. 총 예상 재고량에 의한 재고 비용과 품절 비용을 최소화함으로써 최적의 보유 재고수량을 찾아내고 실제로 사용자가 활용할 수 있는 시간 내에 해를 구할 수 있는 효율성을 갖춘 알고리듬을 개발하였다. 본 연구의 목적은 전체 시스템의 총비용을 최소화하는 것이며, 예제를 통하여 알고리듬을 묘사하고 수치예제를 통한 실험을 실시하여 제안 알고리듬이 정확하고 효율적임을 보였다. 제안된 알고리즘에 의하여 매우 정확하고 효율적인 계산 결과를 얻을 수 있었으며, 이 방법을 통해 신속하고 정확하게 많은 문제를 해결할 수 있을 것으로 생각된다.

• Journal of Digital Convergence
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• v.12 no.9
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• pp.93-99
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• 2014

This study aims to explore and analyze smartphone users' characteristics from the two perspectives (purchase vs. use characteristics) on the two operating systems (iOS and Android). The results of the study on purchase characteristics show that smartphones choice priority and the gender ratio are found to be significantly different between the two operating system users. However, the replacement cycle is not statistically different from iOS and Android users. The results of study on use characteristics show that the number of the applications and the registered SNS(social network service), the average monthly smartphone bill, and satisfaction are significantly different between iOS and Android users. However, the average Internet usage time is not different between the two operating system users. The findings provide useful implications for operating developers, smartphone manufacturers, and application developers.

• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.163.1-163.1
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• 2010

2030년까지 신재생에너지발전 비중을 11%로 높이겠다는 정책목표 달성을 위한 정부의 지원방안이 현행 발전차액지원제도(FIT)에서 2012년부터는 신재생에너지의무할당제(RPS)로 전환된다. 전원별로 정해진 발전량에 대해 정부가 일정한 가격으로 구매해주는 현행 제도 하에서 신재생에너지발전사업자는 중장기 가격을 보장받음으로써 수익성을 초기에 확정할 수 있는 장점이 있는 반면 정부 입장에서는 보급이 확대될수록 막대한 재정부담이 발생하고 경쟁을 통해 생산 비용을 낮추기 위한 유인이 부족한 단점이 있다. 이러한 단점을 보완하기 위해 도입되는 의무할당제는 일정 설비규모 이상의 발전사업자에게 신재생에너지발전 의무량을 부과하고 의무대상자가 의무이행의 수단으로 공급인증서(REC)를 발급받거나 구매하여 의무를 이행토록 하는 제도로서 공급인증서 가격 결정을 시장기능에 맡김으로써 신재생에너지 사업자간 경쟁을 촉진시켜 생산비용을 절감하고 정부의 재정부담을 완화하는 장점이 있는 반면 신재생에너지발전사업자 입장에서는 수익성 분석이 복잡해지고 리스크가 증가하는 문제점이 있다. 특히 발전용 연료전지를 활용한 발전사업의 경우 다른 신재생에너지원과 달리 설비투자비용(CAPEX) 외에 가스요금 및 핵심부품의 주기적인 교체 등을 위한 운영비용(OPEX)의 비중이 작지 않기 때문에 더욱 정밀한 분석이 필요하다. 본 연구에서는 신재생에너지발전사업자 입장에서 비용과 편익에 영향을 미치는 각 요소와 그 영향을 파악함으로써 발전용 연료전지의 경제성 분석을 시도해 보았다.

• Korean Chemical Engineering Research
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• v.60 no.4
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• pp.478-485
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• 2022

The certification performance issued through an external business is sold to companies subject to the emission trading system allocation, and the company subject to the allocation can secure the quota by converting the purchased external business certification performance into offset credits. In this methodology, when fossil fuels that used existing oil boilers (by oil type) were replaced with boilers using propane gas with a relatively low carbon content, the amount of carbon dioxide emission reduction by oil type was recognized. As an initial analysis to make up for the insufficient quota of large corporations, the amount of carbon reduction emissions and emission rights trading was calculated.

• Journal of Digital Convergence
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• v.12 no.2
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• pp.373-378
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• 2014

To investigate the wear status of contact lenses by analyzing care of contact lenses container and actual condition of people wearing contact lenses and in Gyeonggido. The results were based on a questionnaire survey of 200 people who are the students of the middle school, the high school and the college among the clients of opticians to purchase contact lenses for six months from January 2013 to July 2013. According to the poll, the highest number of those polled, 139 (55.16%) people, said they were wearing cosmetic color contact lenses. Female respondents and male respondents were in the proportion of 177 (88.5%) to 23 (11.5%), respectively. 37 people (18.5%) who responded said "yes" to the question of them sharing contact lenses and glasses. 103 people (51.5%) answered "no" to the question of regularly replacing their lens containers. 148 people (74%) answered "yes" to the question of having glasses in order to investigate contact lens wearers user rate of glasses. The highest number of respondents, 127 people (63.5%), said "middle school" was the first time that they wore contacts. Meanwhile, 65 people (43.92%) said they initiated wearing glasses at 4th-6th grades. It is considered that it is necessary using proper contact lenses suitable for the clients' eye health in order of vision correction, rather than for cosmetic purposes. The role of the optician is considered to be very important for the proper management of the appropriate contact lens hygiene and regular optical check-ups of the contact lens wearers.

• Korean Journal of Construction Engineering and Management
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• v.23 no.3
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• pp.66-73
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• 2022

In order to induce users to purchase excellent products in the water industry that satisfy the technical standards of excellent products, in this study, it is to present the advantages of the cost aspect of the pumps as the objective basis. It will be to promote technology development of domestic water companies and to create a virtuous cycle structure in the water industry. In order to present an objective basis for the merits in terms of cost, an economic evaluation was conducted through life cycle cost analysis. For the LCC analysis, initial cost (pump cost and installation cost), operation cost (energy cost and maintenance cost) and demolition cost (disposal cost and residual value) are searched and calculated. As the results of comparison on two capacity of pumps, the energy cost of the excellent pump is 212 million KRW lower than the that of general pump in the large pump. The cost of excellent pump was 17 million KRW lower than that of general pump in small capacity pump. As the results of sensibility test, if the product is developed in the direction of improving pump efficiency and increasing the replacement cycle of consumables, it is predicted that the effect on LCC will be large.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.207-209
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• 2015

Recently, with the economy and the information communication technology developed, the smartphone market grows continuously. The market outlook on the wireless rechargeable technology grows rapidly so that the market size is increased about six times bigger than that of the last year, and it will grow about 18 billion dollars in 2014. Because of that, as the interest on this area out focused, many kinds of technology and new product are being exploited in this field. Participants of this study were 76 mobile users in Gyeongnam and Jeonbuk province in accordance with convenience sampling. Most of the respondents about 88 percent, the wireless charger may be answered to be able to explain what it is. Also, about 70 percent of the respondents, is time to replace the future of smart phone, answered by selecting a product in consideration of the wireless charging. Based on these findings, several theoretical and practical implications were suggested.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.8
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• pp.1139-1145
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• 2018

According to the prosecutors' office's statistics for 2014, 53% of a bicycle users have experienced theft. The reason for the high rate of bicycle stolen in Korea is that there is no bicycle management system. This is because they do not use bicycle numbers to manage bikes like cars do. Most people do not know if they have a VIN(Vehicle Identification Number) on their bike. If the buyer registers the bicycle in the bicycle management blockchain system, anyone can view the information registered in the chain, so that if the bicycle number is filled in, the bicycle can be identified. In addition, when an accident occurs, blockchain will record what kind of equipment it is replacing, like an automobile, to manage all the information about the bicycle. In this way, consumers can inquire whether they have a history of accident when they make a second-hand transaction. In this paper, we propose a method to construct bicycle management system using bicycle VIN.

• Korean Journal of Construction Engineering and Management
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• v.11 no.1
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• pp.79-87
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• 2010

The purpose of this study is to find decisive factors affecting Share-styled Apartment house Lee Myung-bak announced for the homeless masses in February 2008. This policy tried to add up defects from Half-priced Apartment house enforced in 2007. Seoul is ranked as the highest PIR(Price Income Rate) city in the world, as far as the difficulties in getting own house is concerned. Korean government has announced a lot of policies to control the price of real-estate, especially housing bubble phenomenon, since the convalescence from IMF financial crisis. By making questionnaires to get an important factor and taking counsel with related specialists, this thesis found what kind of roles the objects including government, institutions and people should play or focus on.