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무선센서네트워크에서 에너지 효율적인 그리드 기반의 홀 우회 방식
김성휘(Sunghwi Kim),박호성(Hosung Park),이정철(Jeongcheol Lee),김상하(Sang-Ha Kim) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.4B
무선센서네트워크에서 예기치 못한 지형과 자연현상 또는 노드 파손, 불균형적인 에너지 손실로 홀(hole)이 발생하는 것은 필수불가결하다. 이런 문제를 다루는 대부분의 현존 방식은 홀을 피하기 위해 정적인 우회 경로를 구성한다. 정적인 우회 경로는 홀 주변부에 있는 노드들의 과도한 에너지 손실을 유발한다. 그래서 데이터 패킷이홀 주변 노드에 몰리고 노드들의 에너지는 급속하게 고갈되며 홀의 영역이 확대되는 효과가 나타난다. 이러한 문제점을 해결하기 위하여 가상 그리드 상에서 위치기반 라우팅 방식과 동적인 그리드 앵커포인터 설정을 통한 효율적인 홀 우회 방식을 제안한다. 제안된 홀 우회 방식은 홀이 있는 불규칙한 무선센서네트워크에서도 에너지 효율적이며 데이터 신뢰성을 제공하는 홀 우회 전송방식이다. 시뮬레이션 결과는 이러한 주장의 타당성을 제공한다. Holes that generated by the unpredictable and harsh nature application environment or uneven energy consumption are an inevitable phenomenon in wireless sensor networks. Most of the existing schemes for this hole problem tend to use a static detour path to bypass a hole. The static detour path may lead to uneven energy consumption of the nodes on the boundary of the hole, thus it may enlarge the region of holes. At the same time, traffic would concentrate on the nodes on the boundary of the hole and tend to be depleted quickly. To solve this problem, we introduce energy-efficient grid-based geographic routing and hole-detouring scheme by taking advantage of grid anchor point in wireless sensor network with holes. The location of hole detour anchor node is dynamically shifted in grid cell. just generating dynamic hole detour paths to reduce total energy consumption. Simulation results are provided to validate the claims.
불규칙적 무선센서네트워크에 강한 위치기반 다중경로 제공 방안
김성휘(Sunghwi Kim),박호성(Hosung Park),이정철(Jeongcheol Lee),오승민(Seungmin Oh),김상하(Sang-Ha Kim) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.1B
무선센서네트워크는 전력 공급이 제한적인 대규모의 센서 노드들로 구성되어 있다. 에너지 비용의 최소화와 여러 홉을 거쳐 싱크 노드까지 안정적으로 데이터전송의 신뢰성을 높이는 것은 매우 중요한 요소이다. 데이터 전송의 신뢰성을 높이는 방안으로 다중경로 라우팅 방안이 제시되고 있다. 플러딩 기반의 다중경로 라우팅 방식은 불규칙적 무선센서네트워크에서도 효과적으로 다중경로를 구성할 수 있는 장점이 있지만 전원 공급에서 제약이 많은 무선센서네트워크에서는 적합하지 않은 라우팅 방식이다. 그러나 최소의 오버헤드를 가진 지역 위치정보를 이용하는 위치기반 라우팅 방식은 비플러딩 방식으로 무선센서네트워크에서 효율적인 방식이지만 다중경로 구성 시 데이터 패킷의 충돌을 유발할 수 있다. 패킷 충돌을 제어할 수 있는 방안으로 다중경로 파이프라인 개념을 도입하였지만 홀과 같은 불규칙적 네트워크에서는 파이프라인을 구성하기가 어렵다. 이러한 문제점을 해결하기 위하여 가상 그리드 좌표 상에서 위치기반 포워딩 방식과 다중경로 상의 홀 회피 알고리즘이 결합된 새로운 다중경로 라우팅 방식을 제안한다. 제안된 다중경로 방식은 불규칙적 무선센서네트워크에서 효율적이고 전송 신뢰성을 높일 수 있는 노드 분리된 다중경로(multipath) 파이프라인을 구성할 수 있는 방식이다. 시뮬레이션 결과는 이러한 주장의 타당성을 제공한다. Sensor networks are composed of a great number of sensor nodes with constrained battery. Disjoint multipath scheme based flooding method has a merit that efficiently construct multi path in irregular networks, but causes lots of energy consumption in networks. Flooding method is not a suitable technology in wireless sensor networks with constrained battery. We introduce energy-efficient geographic routing scheme considered as an efficient, simple, and scalable routing protocol for wireless sensor networks. The geographic routing scheme on multi path generates a problem with a congestion. So we introduce the concept of multi path pipeline as a congestion avoidance strategy. But multipath pipelines have a big problem on the boundary of holes under irregular networks. We propose a novel disjoint multipath scheme as combined method with geographic routing scheme and hole detouring algorithm on multi path. A novel disjoint multi path scheme constructs disjoint multipath pipelines efficiently for reliability without a collision in irregular wireless sensor networks. Simulation results are provided to validate the claims.
허정회 ( Jeonghoi Heo ),이명기 ( Myoungki Lee ),유찬희 ( Chanhee Rhew ),우성휘 ( Sunghwi Woo ) 한국농업정책학회 2018 농업경영정책연구 Vol.45 No.4
In this study, the factors anticipated to affect sustainability of Korean agriculture are identified and selected, then importance and performance of each one are analyzed. To this end, the OECD policy analysis framework is employed to serve as a theoretical and conceptual foundation in that it contains a lot of relevant factors and/or sectors not only within agricultural sector but others interacting with the sector. Following the framework, the sustainability-related factors are allocated into economic, societal, and environmental dimensions, and again belonged to more detailed groups. Importance-Performance Analysis is then conducted to quantitatively determine which factors are of higher priority and which problems are to be tackled imperatively. A comprehensive sustainability level of Korean agriculture assessed by the Sustainability Composite Index (SCI) was 56.1 points (out of 100 points) indicating that there is still room for improvement in various sectors. Especially, the achievement level of social and environmental sustainability was low in the agricultural policy sector. It also shows that agricultural production and food safety, policy implementation capacities, and aging rural population have priority to be improved among the detailed indicators.
임형준(Hyungjun Lim),이재종(Jaejong Lee),최기봉(Kee-Bong Choi),김기홍(Geehong Kim),이성휘(Sunghwi Lee) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.5
Roll-based, nanoimprint lithography (Roll-NIL) is one effective method to produce large-area nanopatterns continuously. Systems and processes for Roll-NIL have been developed and studied for more than 15 years. Since the shapes of the stamp and the substrate for Roll-NIL can be plates, films, and rolls, there exist many concepts to design and implement roll-NIL systems. Combinations and variations of contact-methods for variously shaped stamps and substrates are analyzed in this paper. The contact-area can be changed by using soft materials such as polydimethylsiloxane (PDMS) or silicone rubber. Ultraviolet (UV) sources appropriate for the roll-to-plate or roll-to-roll process are introduced. Finally, two roll-to-plate nanoimprint lithography systems are illustrated.
김희수(Heesoo Kim),배용채(Yongchae Bae),김연환(Yeonwhan Kim),이현(Hyun Lee),김성휘(Sunghwi Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The steady stress, modal analysis for the damaged blade was carried out to evaluate the integrity of LP 4<br/> blade row. As a result, 4 dangerous modes for LP blade row were found in the interference diagram and it<br/> was confirmed that the nozzle passing frequency has nothing to do with the blade failure. And then the<br/> dynamic stress are analysed for the 4 dangerous modes. There are some points far out of maximum allowable<br/> stress in the cover and tenon. Therefore the blade is not safe according to the Goodman judgement. So the<br/> manufacturer have modified the design of cover and tenon. Until now, the power plant is being operated<br/> without special problems.
윤동원(Dongwon Yun),손영수(Youngsoo Son),박희창(Heechang Park),김병인(Byungin Kim),이성휘(Sunghwi Lee),함상용(Sangyong Ham) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this paper, a hybrid roll for a roll-to-roll hot embossing system to fabricate micro patterns is studied. In previous studies, heating rolls are widely used to heat the polymer substrate for embossing process, so the rolls only give heat to the substrate. The hybrid roll studied in this paper can be used as not only a heating roll but also a cooling roll. It is expected that more flexible process can be designed if the hybrid roll is used in the roll to roll hot embossing process. Some analysis to design the roll is presented in this paper.
윤동원(Dongwon Yun),손영수(Youngsoo Son),박희창(Heechang Park),김병인(Byungin Kim),이성휘(Sunghwi Lee),박철훈(Cheolhun Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this paper, electromagnetic analysis has been conducted to analyze and design the induction heating roll for roll-to-roll embossing process. The roll has some coolant pipe and jacket, the influence of the structural variance on the mangeitc filed is considered through finite element analysis.