• Journal of the Korean Recycled Construction Resources Institute
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• v.3 no.4
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• pp.328-334
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• 2015

Building insulation materials use for the purpose of energy saving. Insulation materials can be classified inorganic and organic insulation materials. Inorganic insulation is used for fire resistive performance parts and organic insulation is used for thermal performance parts. Meanwhile, organic insulation is due to toxic gas emission in fire. Inorganic insulation is too heavy and low thermal performance than organic materials. This study is focused on evaluation of the physical properties of inorganic foam material using industrial by-products such as waste glass powder and fly ash. From the test result, inorganic foam materials for the applicability of fire-resistance and insulation light-weight materials.

• Progress in Medical Physics
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• v.13 no.3
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• pp.156-162
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• 2002

In this study, we attempted in preparing high precision EEG measuring equipment. To measure EEG in high efficiency, pre-amplifier should get high performance common mode rejection ratio. Also, separation amplifier is essential to eliminate common line noise. So, our study were pointed at elevating the efficiency of eliminating noise, user safety and low noise characteristics. Prepared high precision pre-amplifier for EEG was A/D converted to automatically classify $\alpha$ wave, $\beta$ wave and $\theta$ wave. And converted data were Fast Fourier Transformed with real time DSP (Digital Signal Processing). Clinical demonstrations were carried out with healthy students, aged between 20 to 26 who has no histories of illness. To recognize the efficiency of the EEG, prepared EEG were used with MS equipment in low stimulated state and high stimulated state. Then, we studied at the effect of sensitivity on brain wave. From this study, it is known that our EEG equipment is efficient in sensitivity evaluation and suitable stimulations for each psychological state are required.

• Korean Business Review
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• v.20 no.2
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• pp.61-85
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• 2007

Competitiveness of a firm essentially depends on the value of the product or service the firm supply. Product or service of high value derives customer purchase activity. Service mix is the process which creates competitiveness by value creation for customers through optimal combination of physical characteristics of product and service. This research is to contribute competitiveness increase of Korean manufacture industry by study of the effect of service mix as to the business competitiveness. Usually competitiveness advantage approach relies on the industry structure competition theory and the resource-based approach. However, it is said that, while the industry structure competition theory helps finding attractive industry, it rarely helps finding which companies succeed or fail in the specific industry. The resource-based viewpoint approach is limited in that this cannot provide any theory or systematic frame for the analysis even though it has contributed a lot to the competitiveness increase. Power process approach is applied to this study in order to overcome this limit and to Increase the business competitiveness. Power process is the process to create the value, the source of power by interaction of power elements, value, needs, environment and relation, the five power determination elements. Power process is a process that creates value to satisfy the power objective for the attainment of the goals of the power subject. This study is to contribute for the manufacture industry by establishing service mix strategy from the power process viewpoint.

• Information Systems Review
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• v.26 no.1
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• pp.385-407
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• 2024

This study explains consumers' showrooming which refers to the activities of visiting offline stores to check products in person and obtaining information offline and online via mobile devices before making the final decision to buy. More specifically, this study verifies key determinants of showrooming based on two dimensions of the mobile technology and user characteristics. Furthermore, the study examines the relationship of showrooming and purchase intentions and the moderating effect of perceived risks on the relationship. The key findings are as follows: firstly, service connectivity and time convenience of the mobile technology characteristics are positively related to showroming. Secondly, as the user characteristics, need for touch and personal innovativeness increase showrooming while impulsiveness does not. Thirdly, showrooming contributes to the increase of purchase intentions. Finally, moderating effect of perceived risks has turned out to be insignificant. This study has implications by providing the understanding of key determinants of showrooming and further proving the positive relationship of showrooming and purchase intentions.

• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.2
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• pp.190-201
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• 2004

The aim of this study was to evaluate the resistance to degradation and to compare the wear resistance characteristics of four esthetic restorative materials in an alkaline solution. The brands studied were Charmfil, Charmfil flow(composite resin), Compoglass F and PrimaFlow(compomer). The results were as follows: 1. The mass loss were not significantly different among the materials(p>0.05). 2. The sequence of the degree of degradation layer depth was in descending order by Compoglass F, PrimaFlow, Charmfil, and Charmfil flow. There were significant differences between Compoglass F and the others(p<0.05). 3. The sequence of the Si loss was in descending order by Charmfil flow, Charmfil, PrimaFlow, and Compoglass F. There were significant differences among these materials(p<0.05). 4. When observed with SEM, destruction of bonding between matrix and filler was observed and when observed with CLSM, the depth of degradation layer of specimen surface was observed. 5. The sequence of maximum wear depth was in descending order by Comfoglass, PrimaFlow Charmal, and Charmfil flow. There were significant differences among these materials(p<0.05). 6. The correlation coefficient between Si loss and degradation layer depth (r=0.602, p<0.05) Vicker's hardness number and maximum wear depth (r=0.501, p<0.05) were relatively high. These results indicate that wear and hydrolytic degradation may be considered to be evaluation factors of composite resins and compomers.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.12
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• pp.1150-1158
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• 2013

Artificial cochlear implant system is known as the most efficient and widespread device to patients who have cochlear disorder. However, current commercialized artificial cochleas have inconveniences because of large volume size and high power consumption, requiring further research on improvements in terms of the size, power, and performance. In this paper, we will introduce our fully implantable artificial cochlear implant system, where small-size sensors and actuators are wirelessly connected, focusing on communication system design and its performance simulation.

• 한국방재학회:학술대회논문집
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• 2007.02a
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• pp.113-116
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• 2007

This is a research for evaluated recycled glass powder to add asphalt concrete filler. To make a comparative study, Mechanical performance of lime stone and slag dust Mixtures was evaluated according to test procedure. Lab. performance tests included marshall stability, indirect tensile strength, resilient modulus and wheel tracking. Water resistance tests were evaluated by marshall strength ratio and tensile strength ratio. In conclusion, Results of mechanical performance showed that recycled glass powder mixtures were equivalent to conventional mixtures. Especially, result of tensile strength ratio tested recycled glass powder mixtures was superior to conventional mixtures.

• 한국HCI학회:학술대회논문집
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• 2007.02b
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• pp.241-248
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• 2007

가정용 통합형 리모콘에 관한 연구의 중간 점검 결과 5 가지 디자인 요소를 찾을 수 있었다. 본 연구는 이 선행 연구를 통해 조작대상 기기의 변환 제어에 관한 요소의 중요성이 인식되어 이에 관한 좀 더 심도있는 분석과 연구를 진행한 것이다. 먼저 가정용 통합형 리모콘의 사용상황을 3 가지 (C1, C2, C3)로 분류하고 물리적이고 직관적으로 기기를 사용하는 C1 조작 상황을 연구의 범위로 제한하였다. C1 조작 상황에서 통합형 리모콘으로 기기를 변환, 제어하는 방법으로서 피지컬 트랜지션을 연구의 대상으로 정하였다. 피지컬 트랜지션 연구를 위해 현재 출시된 통합형 리모콘의 기기 변환, 제어 사례 연구와 조작 대상 기기의 특정을 분석하여 통합형 리모콘의 사례연구를 통해 기기 변환, 제어 방법을 4가지로 정리해 보았다. 또한 조작 대상 기기를 조작 상황인지를 위한 디스플레이 요소, 작동방식 (ON/OFF, OPEN/CLOSE), 사용빈도 등에 따라 3가지로 분류하고 이 3 가지 종류의 조작 방식을 사용할 때, 어떻게 대상기기에 맞게 전환하여 사용할 것인지, 사용자가 어떻게 이 방법에 접근할 수 있는지에 관한 피지컬 트랜지션 아이디어를 도출하는 연구를 진행하였다. 피지컬 트랜지션 아이디어는 현재 출시된 통합형 리모콘의 추출 연구 및 조작 대상 기기의 사용 특성 분류 연구 아이디어 도출 연구 일반 제품의 인터페이스 연구관련 유사 사례 연구를 통해 대안을 개발 제시 하였다. 본 연구는 통합형 리모콘 디자인에서 조작 방식 전환을 위한 디자인 개발 시에 유용하게 쓰여 질 것이라고 기대한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.6
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• pp.1077-1082
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• 2009

Wireless Mesh Network(WMN) is wireless backbone networks technique which has ease of network configuration and cost of advantage. Recently, WNM released a new product, but most of existing research and technology analysis the performance through the simulation. This paper build the wireless mesh network testbed for actual situation. Testbed supports multi-channel multi-interface using bridge, the Wireless Distribution System and dynamic location-based routing protocol. This routing protocol strongly design against wireless interference using metric for link channel change and real distance. Then, the address of mesh clients assigned by the centralized address management server. Mesh clients is designed and implemented to manage network through Simple Network Management Protocol.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.87-90
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• 2009

Wireless Mesh Network(WMN) is wireless backbone networks technique which has ease of network configuration and cost of advantage. Recently, WNM released a new product, but most of existing research and technology analysis the performance through the simulation. This paper build the wireless mesh network testbed for actual situation. Testbed supports multi-channel multi-interface using bridge, the Wireless Distribution System and dynamic location-based routing protocol. This routing protocol strongly design against wireless interference using metric for link channel change and real distance. Then, the address of mesh clients assigned by the centralized address management server. Mesh clients is designed and implemented to manage network through Simple Network Management Protocol.