• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.41-43
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• 2017

본 논문에서는 IoS (Internet of Signage) 환경에서 실감형 데이터 전송을 위한 상황 인지 기반 적응형 전송기법을 적용하고 이를 분석한다. 사이니지 네트워크 환경에서는 임의적인 다중 경로 페이딩, 간섭 등과 같은 왜곡 요소가 존재할 수 있기 때문에 이를 대처하기 위해 무선 송신기에서는 채널 환경에 대한 인지 이후, 그에 따른 MCS (Modulation and Coding Scheme)를 선정 및 안테나 기법을 선정한다. MCS 및 안테나 기법 선정을 위해 무선 송신기에서는 사전에 알고 있는 통계적인 SNR (Signal-to-Noise Ratio) 값을 통해 문턱값을 계산하고, 수신 사이니지로부터 얻은 CSI (Channel State Information)와의 크기 비교를 한다. 시뮬레이션 결과에서는 상황 인지를 기반으로 매 순간 최적의 전송률을 달성할 수 있음을 볼 수 있다.

• Korean Journal of Construction Engineering and Management
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• v.9 no.4
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• pp.84-91
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• 2008

"Eco-friendly construction" is an emerging issue in the building industry. Main purpose of the eco-friendly construction is to sustain the health and environment of building residents and to minimize the harmful effect on their environment. Apartment residents have great concern on eco-product, since many cases are reported that Sick Building Syndrome is caused by toxic substance from building materials. Environmental performance is to meet through using the highest grade eco-friendly materials. However, generally eco-friendly materials are more expensive than normal materials, Therefore, using eco-friendly materials at public housing project is limited to economical aspect. The purpose of this paper is development of eco-friendly material selection model considered cost efficiency. The selection of Eco-friendly finishing materials and their methods are constructed to consider environmental performance level and cost index compositively. Development of eco-friendly material selection method is economic and reasonable one when public housing is constructed.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.1
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• pp.251-259
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• 2006

The increase in international logistics market and various customer demands emphasize the importance of Multimodal Transportation, and that market is continuously keep growing. In order to ensure competitive superiority in a market of such infinite competition, service that can satisfy each individual customer by considering various customer characteristics, has become an issue. Thus, through the aspect of service, in order to improve customer satisfaction, growing factors of Multimodal Transportation Route on was studied in this research. For this research, first of all main service factors that affect the growth of Multimodal Transportation were seized by literature survey and positive research. The, by using these factors a methodology that enables individual customers to assess Multimodal Transportation Route was studied. Through this research, individual customers can acquire objective assessment data and Multimodal Transportation companies can seize what factors are considered as important by their customers.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.135-138
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• 2020

무선 센서 네트워크에서 모바일 싱크의 도입은 기존의 고정된 위치의 싱크를 사용하는 WSN에서 발생하는, 싱크 주변 노드들과 외곽 노드들 간의 에너지 불균형 문제(에너지 핫스팟 문제)를 어느 정도 해결할 수 있게 하였다. 그러나 모바일 싱크의 에너지 제약으로 인해 싱크가 모든 노드를 방문하여 데이터를 수집할 수 없기 때문에, 앵커(또는 헤드)라고 불리는 특정 노드에서 데이터를 모으고, 모바일 싱크는 이러한 앵커 노드들만을 방문하는 방법이 널리 사용되고 있다. 최근 연구에서는 모바일 싱크가 보다 효율적으로 에너지 불균형 문제를 해결하기 위하여 모바일 싱크 이동 경로 및 앵커 노드 선정 최적화 방법이 활발히 연구되고 있다. 본 연구에서는 태양 에너지 기반 센서 네트워크를 위한 영역 기반 앵커 선정 기법 및 모바일 싱크 이동 경로 선택 기법을 제안한다. 제안 기법은 각 노드가 수집하는 태양 에너지의 활용을 최대화하고, 에너지 핫스팟 문제를 완화하기 위해 두 개의 라인(영역)을 설정하고 이 라인을 따라 앵커 노드가 선정된다. 모바일 싱크는 데이터 수집을 위해 이 두 라인을 왕복 이동 경로로 택하여 라인 내의 앵커 노드를 방문한다. 실험을 통해 제안 기법이 기존 기법보다 에너지 불균형 문제가 완화되어 노드의 정전 시간이 줄어들고, 이에 따라 모바일 싱크에서 수집되는 데이터의 양이 증가하는 것을 확인하였다.

• The KIPS Transactions:PartC
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• v.14C no.7
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• pp.611-620
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• 2007

Distributing the routing path over the entire network is an important factor to maintain the lifetime of wireless sensor network as long as possible. This paper proposes a fuzzy routing protocol that decides a routing path based on the fuzzy control rules. The fuzzy controller receives the energy values, distances, and hop counts of possible route paths as input, and the inference engine produces the contribution factors for each of route paths. The route path with the largest contribution factor is elected as the final routing path. The nodes contained in the routing path reduce their energy after transmitting a data packet so as to prevent the same route path from being selected repeatedly. It makes the network traffic spreaded over the network resulting longer network lifetime. The computer simulations on TinyOS have shown that the fuzzy routing protocol is more energy efficient and has longer network lifetime compared to the existing routing protocols.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.1A
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• pp.23-29
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• 2006

In wireless sensor networks(WSNs), it is crucial to maintain network connectivity as long as possible since nodes are battery-powered and unchange-able. We propose a new routing protocol called Energy Aware Source Routing(EASR) which can be efficient in respect of network lifetime and long-term connectivity. Our protocol is multipath source routing, only one path will be selected at the same time and each path has probability to be selected like as Energy Aware Routing(EAR) protocol. The route discovery procedure of EASR protocol is reformed from the route discovery procedure of Split Multipath Routing(SMR) protocol. However, there is the difference between SMR and EASR. In EASR, we define an overhearing ratio in order to reduce energy waste due to overhearing effect among each selected path. Thus, we can establish energy efficient multiple paths by making use of overhearing ratio. The simulation results are also demonstrated that our scheme increases in network lifetimes, and achieves reasonable packet latency time.

• Journal of Korea Port Economic Association
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• v.27 no.2
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• pp.1-26
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• 2011

This study was conducted to select the location of the logistics center for environment-friendly agricultural products in the Gwangyang Bay Area. AHP(Analytic Hierarchy Process) technique was used to examine location selection factors and factor hierarchy was made through a questionnaire survey and an expert interview for objective and quantitative decision. The hierarchy process of location factors of logistics center for environment-friendly agricultural products in the Gwangyang Bay Area were categorized into five factors such as natural factors, economic factors, social factors, distribution efficiency, and land use plan. Then, those factors were sub-categorized into three factors each. As a result of pair-wise comparison analysis of five categories, the weight of economic factors was the highest, and easy cargo transportation, fitness to higher-order plan, climate, land price, and limitation regulations of sub-categorized factors appeared as comparative evaluation criteria. The priority of the final candidate was decided through this process. While the weight of the Yulchon II Industrial Complex was the highest in natural and economic factors were the highest, the weight of the Gwangyang Hwanggeum Industrial Complex was the highest in social factors, distribution efficiency, and land use plan. The result of the final analysis showed that the Gwangyang Hwanggeum Industrial Complex was the most optimal location candidate for the logistics center for environment-friendly agricultural products.

• The monthly packaging world
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• s.332
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• pp.94-97
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• 2020

최근 (주)신명이노텍(대표이사 문근식)이 환경부의 '스마트 생태공장 구축사업' 지원기업으로 선정됐다. 이는 문근식 신명이노텍 대표이사가 일찌감치 생태공장에 관심을 갖고 사내에 생태연못을 조성하는 등 친환경 제조공장으로서의 노력을 게을리 하지 않은 결과라 할 수 있다. 친환경 포장재 개발에도 많은 노력을 기울이고 있는 문 대표이사를 만나 친환경시대에 포장기업이 나아가야 할 길에 대한 이야기를 들어보았다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.11a
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• pp.13-15
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• 2023

환경친화적 선박(이하 친환경 선박)의 소개 및 건조근거와 대상 선정 방법에 대하여 설명하고, 선박 건조 업무 시 고려사항과 선박 건조 업무를 경제적, 효율적으로 추진하기 위한 아이디어를 제안하였다.

• Journal of IKEEE
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• v.22 no.3
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• pp.590-598
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• 2018

Recently, interest in IoT(Internet of Things) technology, which provides Internet services to objects, is increasing. IoT offers a variety of services in home networks, healthcare, and disaster alerts. IoT with LLN(Low Power & Lossy Networks) feature frequently loses sensor node. RPL, the standard routing protocol of IoT, performs global repair when data loss occurs in a sensor node. However, frequent loss of sensor nodes due to lower sensor nodes causes network performance degradation due to frequent full path reset. In this paper, we propose an additional selection method of the storage mode sensor node to solve the network degradation problem due to the frequent path resetting problem even after selecting the storage mode sensor node, and propose a method of equalizing the total path resetting number of each instance.