• Journal of Information Technology Applications and Management
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• 제26권3호
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• pp.61-80
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• 2019

The cooperation between universities and industries is already one of the most important factors driving the national economy in the knowledge-based society of the 21st century represented by the Fourth Industrial Revolution. The Korean government has also been carrying out legal and institutional re-adjustments to promote industrial-university cooperation in line with demands for such changes in the times. However, despite this industry-academic cooperation system, there is still a significant mismatch between industrial demand and the university's workforce development system. By the way, there is a Cooperative Education(CO-OP) in Canada and the United States. It's an innovative link between the university and the industry. The reason is that the CO-OP program not only allows students to gain experience with their majors in the industrial field, but also plays a positive role in improving their specialty expertise. In particular, field information, ideas, and job insights that students acquire through CO-OP also serve as motivation for starting a business beyond employment after graduation. Furthermore, CO-OP experience is an important opportunity for future researchers to come up with commercialized research results that are not separated from the field sites The purpose of this study is to overcome the gap between industrial demand and the college manpower training system, and develop a Korean-style coaching program model as a growth engine for creative talent-building policies, represented by 'creation of start-ups and new industry.' In addition, this study suggested measures that can be applied in real universities. In addition, the study also highlighted that the introduction of CO-OP programs with field practices in Korea could also boost start-ups. Based on the Korean CO-OP program model, the curricula applicable to domestic universities consisted of two types : general and research-oriented university types.

• Journal of Communications and Networks
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• 제9권3호
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• pp.296-311
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• 2007

Mobile multi-robot teams are useful in many critical applications such as search and rescue. Explicit communication among robots in such mobile multi-robot teams is useful for the coordination of such teams as well as exchanging data. Since many applications for mobile robots involve scenarios in which communication infrastructure may be damaged or unavailable, mobile robot teams frequently need to communicate with each other via ad hoc networking. In such scenarios, low-overhead and energy-efficient routing protocols for delivering messages among robots are a key requirement. Two important primitives for communication are essential for enabling a wide variety of mobile robot applications. First, unicast communication (between two robots) needs to be provided to enable coordination and data exchange. Second, in many applications, group communication is required for flexible control, organization, and management of the mobile robots. Multicast provides a bandwidth-efficient communication method between a source and a group of robots. In this paper, we first propose and evaluate two unicast routing protocols tailored for use in ad hoc networks formed by mobile multi-robot teams: Mobile robot distance vector (MRDV) and mobile robot source routing (MRSR). Both protocols exploit the unique mobility characteristics of mobile robot networks to perform efficient routing. Our simulation study show that both MRDV and MRSR incur lower overhead while operating in mobile robot networks when compared to traditional mobile ad hoc network routing protocols such as DSR and AODV. We then propose and evaluate an efficient multicast protocol mobile robot mesh multicast (MRMM) for deployment in mobile robot networks. MRMM exploits the fact that mobile robots know what velocity they are instructed to move at and for what distance in building a long lifetime sparse mesh for group communication that is more efficient. Our results show that MRMM provides an efficient group communication mechanism that can potentially be used in many mobile robot application scenarios.

• 한국인터넷방송통신학회논문지
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• 제21권6호
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• pp.91-97
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• 2021

마이크로서버는 컴퓨팅 서버의 일종으로 2개 이상의 CPU 소켓을 별도의 컴퓨팅 보드에 구현하고, 다수 개의 컴퓨팅 보드를 메인 보드에 집적하는 형태를 지닌다. 클러스터 시스템을 구축하는데 있어서, 마이크로서버를 사용하면 기존의 서버를 여러 대 랙에 장착하는 방법에 비해, 에너지 효율, 상면, 관리 용이성 측면에서 이점이 있다. 또한, 마이크로서버는 컴퓨팅 보드내 CPU 소켓들, 혹은 컴퓨팅 보드끼리 별도의 내부 연결망을 사용할 수 있어서 성능 측면에서도 이점이 존재한다. 본 논문에서 제안된 마이크로서버는 4개의 CPU 소켓을 지닌 컴퓨팅 보드를 메인보드에 총 16개 장착할 수 있는 서버로 Serial-RapidIO (SRIO)를 내부 연결망으로 사용한다. 마이크로서버의 핵심 성능 이슈인 내부 연결망 측면에서의 성능 비교 분석을 위해, 상용 마이크로서버와 내부 연결망 성능을 비교하고 정량화한다. 시험 결과, 내부 연결망을 활용한 데이터 전송 시 대역폭 측면에서 최대 7배 높은 성능을 보였다. 아울러, 실제 클라우드 컴퓨팅에 사용되는 벤치마크 프로그램 적용 시험에서도 유사 CPU 성능 마이크로서버 대비 60%의 수행시간 감소 효과를 얻었다.

• Nuclear Engineering and Technology
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• 제55권9호
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• pp.3268-3276
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• 2023

The practice of identifying the potential zones for mineral exploration in a speedy and low-cost method includes the use of satellite imagery analysis as a part of remote sensing techniques. It is challenging to explore the iron mineralization of a region through conventional methods which are a time-consuming process. The current study utilizes the Hyperion satellite imagery for mapping the iron mineralization and associated geological features in the Irikkur region, Kannur, Kerala. Along with the remote sensing results, the field study and laboratory-based analysis were conducted to retrieve the ground truth point and geochemical proportion to verify the iron ore mineralization. The MC simulation showed for shielding properties indicate an increase in the linear attenuation coefficient with raising the Fe₂O₃+SiO₂ concentrations in the investigated rocks where it is varied at 0.662 MeV in the range 0.190 cm^-1 - 0.222 cm^-1 with rising the Fe₂O₃+SiO₂ content from 57.86 wt% to 71.15 wt%. The analysis also revealed that when the γ-ray energy increased from 0.221 MeV to 2.506 MeV, sample 1 had the largest linear attenuation coefficient, ranging from 9.33 cm1 to 0.12 cm^-1. Charnockite rocks were found to have exceptional shielding qualities, making them an excellent natural choice for radiation shielding applications.

• Journal of Korea Trade
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• 제26권4호
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• pp.39-62
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• 2022

Purpose - Along with the growing awareness of environmental sustainability, international green entrepreneurship is expected to realize international sustainable development (ISD) by introducing ecological innovation results, using fewer resources consumption, and reducing negative environmental impacts. Building upon contingency theory and social network theory, this paper attempts to explore the role of home country-based networks (technology ties and business ties) as contingent factors that might impact the effectiveness of entrepreneurial orientation (EO) in promoting ISD among green ventures. Design/methodology - Original data were collected from 127 green ventures in China based on the random sampling technique. These green ventures mainly focus on the lower use of energy or materials, lower CO2 emissions, and higher ecological benefits located in the Fujian province, which highlights green economic growth and economic cooperation with international markets. Moderated hierarchical linear regression analysis was conducted to test our hypotheses concerning the main relationship between EO (innovativeness, proactiveness, and risk-taking) and ISD as well as the moderating effects of home country-based networks (technology ties and business ties) on the main relationship. Findings - Empirical results indicate that: first, both innovativeness and proactiveness positively affect ISD; second, both technology ties and business ties at home might significantly strengthen the positive relationship between innovativeness (or proactiveness) and ISD. However, this study did not find significant moderating effects of technology ties or business ties at home on the relationship between risk-taking and ISD. Originality/value - Since previous literature often gives more focus on the host country context of social networks, this study shifts to a home country-based network context. Therefore, our research might enrich the international green entrepreneurship literature by empirically investigating the contingent value of home country-based networks in the relationship between EO and ISD in the context of an emerging economy such as China.

• 설비공학논문집
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• 제14권12호
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• pp.1102-1139
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• 2002

A review on the papers published in the Korean Journal of Air-Conditioning and Refrigerating Engineering in 2000 and 2001 has been done. Focus has been put on current status of research in the aspect of heating, cooling, ventilation, sanitation and building environment. The conclusions are as follows. (1) Most of fundamental studies on fluid flow were related with heat transportation of facilities. Drop formation and rivulet flow on solid surfaces were interesting topics related with condensation augmentation. Research on micro environment considering flow, heat, humidity was also interesting for comfortable living environment. It can be extended considering biological aspects. Development of fans and blowers of high performance and low noise were continuing topics. Well developed CFD technologies were widely applied for developing facilities and their systems. (2) Most of papers related with heat transfer analysis and heat exchanger shows dealt with convection, evaporation, and channel flow for the design application of heat exchanger. The numerical heat transfer simulation studies have been peformed and reported to show heat transfer characteristics. Experimental as well as numerical studies on heat exchanger were reported, while not many papers are available for the system analysis including heat exchanger. (3) A review of the recent studies on heat pump system shows that performance analysis and control of heat pump have been peformed by various simulations and experiments. The research papers on multi-type heat pump system increased significantly. The studies on heat pipe have been examined experimently for change of working characteristics and strut lure. Research on the phase change has been carried out steadily and operation strategies of encapsulated ice storage tank are reported experimentally in several papers. (4) A review of recent studies on refrigeration/air conditioning system have focused on the system performance and efficiency for new alternative refrigerants. Evaporation and condensation heat transfer characteristics are investigated for tube shapes and new alternative refrigerants. Studies on components of refrigeration/air conditioning system are carried to examine efficiency for various compressors and performance of new expansion devices. In addition to thermophysical properties of refrigerant mixtures, studies on new refrigerants are also carried out, however research works on two-phase flow seemed to be insufficient. (5) A review of the recent studies on absorption cooling system indicates that heat and mass transfer phenomena have been investigated to improve absorber performance. Various experimental data have been presented and several simulation models have been proposed. A review of the recent studies on duct and ventilation shows that ventilation indices have been proposed to quantify the ventilation performance in buildings and tunnels. Main efforts have been focused on the applications of ventilation effectiveness in practice, either numerically using computational fluid dynamics or experimentally using tracer gas techniques. (6) Based on a review of recent studies on indoor thermal environment and building service systems, research issues have mainly focused on many innovative ideas such as underfloor air-conditioning system, personal environmental modules, radiant floor cooling and etc. Also, the new approaches for minimizing energy consumption as well as improving indoor environmental conditions through predictive control of HVAC systems, various activities of building energy management and cost-benefit analysis for economic evaluation were highlighted.

• 한국건축시공학회지
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• 제19권2호
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• pp.175-184
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• 2019

본 연구는 시공 및 관리 프로세스의 생산성 및 효율성 향상을 위해 ICT를 적용한 실제 프로세스 사례들을 "IAMB"모델링 기법으로 명시하여, 시공업무의 어떤 단계를 ICT가 대체하며 ICT 도입 특징 및 ICT 도입이 업무 프로세스에 끼친 결과를 분석하였다. 10가지 실제 사례를 분석한 결과, ICT 도입 특징은 ICT의 종류, ICT에 관계하는 주체, ICT가 적용되는 단계에 따라 4가지 유형으로 분류되었다. 각 유형을 분석한 결과, 업무 프로세스에 끼친 긍정적 효과는 주로 정보처리업무의 자동화, 외부위탁 및 일관성 있는 정보취급이었으며, 그 대상은 대부분 원청업체로 규명되었다. 반대로 부정적 결과는 주로 정보의 입력 및 집계 등에 대한 수작업 및 이중 작업의 발생으로 인한 번거로움이었고, 그 대상은 간헐적으로 원청업자 및 빈번히 하청업자가 분포되었다. 정보처리업무의 외부위탁 등으로 주로 원청업체가 긍정적 효과를 수혜하는 반면, 하청업체는 비용과 번거로움을 편무적으로 부담하는 경향을 나타내었다. 이상과 같은 분석을 바탕으로, 시공업무에 ICT 도입 시, 다음과 같은 내용을 고려해야 할 필요가 있음이 규명되었다. 첫째, ICT 적용 패키지를 명시적으로 정의할 필요성. 둘째, 비용 등에 관해서 ICT 적용 시 주 수혜자인 원청업자가 정당하게 비용을 부담하는 것을 명시하는 것의 필요성. 셋째, ICT의 실행기능을 향상시켜, 실제 편익을 극대화하여 부담을 상쇄할 필요성. 넷째, 업무 프로세스에서 일관성 있는 정보활용의 필요성 등이 제기되었다.

• 한국건축시공학회지
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• 제21권6호
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• pp.653-664
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• 2021

최근 에너지절약형 친환경주택의 건설기준 강화에 따라 고효율 주택의 수요가 증가하며, 창호공사의 비중이 함께 증가하고 있다. 창호는 사용빈도가 높고, 시공 시 특성에 따라 많은 하자가 발생할 가능성이 존재한다. 정부 기관이 공공임대주택에서 발생한 하자 민원을 조사한 바에 따르면, 접수된 민원 중 창호공사의 하자가 가장 높은 비중을 차지하고 있었다. 이에 따라 관련 선행연구를 고찰해보았고, 국내의 기존연구들은 창호공사의 시공 특성과 유지관리의 중요성을 반영한 연구가 부족한 실정이었다. 또한, 기존의 국외 연구들은 비용적 측면을 함께 고려해 시공자와 거주자의 입장을 모두 고려하였으며, 하자와 원인의 관계를 구조화하기 위한 움직임을 보여주었다. 따라서 본 연구는 창호공사의 시공단계에서 발생하는 원인을 분석해 시공 특성을 반영하고, 하자 보수 후 재발생 가능성에 기초한 유지관리의 중요성을 함께 고려해 중점관리요소를 도출할 것이다. 또한, 궁극적으로 하자 유형과 원인의 인과관계를 분석해 직관적 판단이 가능한 하자 유형별 중점관리요소를 선정함으로써 실효성 높은 하자관리 방안을 제시해 시공단계 하자를 예방하고 유지관리 비용을 저감하는 데 기여할 것이다.

• 한국환경생태학회지
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• 제32권3호
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• pp.323-331
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• 2018

본 연구는 도로변 선형의 가로녹지 조성이 고밀시가지 대로와 건물 사이에 조성한 보행로 및 오픈스페이스의 미세먼지 농도에 미치는 영향을 살펴보고자 부산시 중앙대로와 부산광역시청 건물 사이에 폭 약 70m로 조성된 오픈스페이스를 대상으로 연구를 진행하였다. 조사결과 가로녹지가 없는 지역의 경우 주중과 주말 모두 차도와 인접한 오픈스페이스의 농도차이가 미미하였으나, 반대로 가로녹지가 조성되어 있는 지역은 차도에 비해 오픈스페이스의 농도가 현저히 높음을 확인할 수 있었다. 특히 가로녹지가 조성된 지역은 차도와 보도 모두에서 미조성지역보다 미세먼지량이 높게 나타나고 있어 차도와 건축물 사이가 넓은 공간의 경우 가로녹지의 조성이 전체적으로 도로 밖 오픈스페이스의 미세먼지농도를 높이는 효과를 보였으며, 특히 차도보다 오픈스페이스에 미치는 영향이 더 큰 것으로 확인되었다. 이러한 현상은 차량에 의해 발생한 미세먼지가 빠른 바람흐름에 의해 가로변 관목림을 통과하지만 바람흐름이 줄어든 보행공간에서는 확산이 이루어지지 않아 발생하는 것으로 판단되었다. 본 연구에서와 같이 넓은 오픈스페이스를 확보하고 있는 도심 도로변 지역의 경우에는 가로녹지가 오히려 바람에 의한 확산을 억제하여 하여 차량이동에 따른 부유 미세먼지를 녹지 내부에 가두어 보도를 포함한 오픈스페이스의 미세먼지 농도를 높이는 것으로 확인되었다. 도로에서 발생하는 미세먼지를 줄이기 위한 가로녹지의 조성에 있어 도로와 건물의 거리는 매우 중요하게 작용하는 것을 확인하였다.

• Journal of the Korean Wood Science and Technology
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• 제34권5호
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• pp.42-51
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• 2006

The this study, the effect of rice husk flour (RHF) as scavenger on formaldehyde emission rate and formaldehyde content from urea-formaldehyde (UF) resin bonded RHF content wood particleboards (PB). Two type of particle size ($30{\mu}m$ and $300{\mu}m$) of RHF was premixed with the UF resin at 5% and 15% by weight. The performance of UF resins is greatly influenced by the curing characteristics in their curing processing. The curing behavior was monitored activation energy ($E_a$) by DSC and pH variation according to RHF contents. PB with dimensions of $27cm{\times}27cm{\times}0.7cm$ was prepared at a specific gravity of 0.75 using $E_1$ and $E_2$ class UF resins. Formaldehyde emission and formaldehyde content from RHF filled PB bonded with UF resin was measured by 24 h desiccator and perforator method, respectively. RHF causes an increased pH of UF resin. $E_a$ of the modified UF resin decreased independently of RHF particle size. As the pH and the $E_a$ variation of the UF resin containing RHF increased, the amount of formaldehyde content decreased. The formaldehyde emission and formaldehyde content levels of the PB bonded with 15 wt% of $30{\mu}m$ RHF and $E_2$ type UF resin were low and satisfied grade $E_1$, as measured by 24 h desiccator and perforator method. The result of a comparison between 24 h desiccator and perforator test using PB showed that the linear regression analyses show a good correlation between the results for the 24 h desiccator and the perforator tests. The linear regression of a correlation between the desiccator and the perforator was Y=4.842X-0.064 ($R^2=0.989$). RHF was effective at reducing formaldehyde emission and formaldehyde content in urea-formaldehyde adhesives when used as scavenger.