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Hyojeong Shin,Talipov, E.,Hojung Cha IEEE 2012 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.11 No.11
<P>Stateless address autoconfiguration protocols allow nodes to select addresses and validate the uniqueness of a selected address by duplicate address detection (DAD). The considerable cost of DAD results from the message complexity increase in multihop network topologies, such as wireless sensor networks. This paper proposes a lightweight, hybrid address autoconfiguration protocol, called Spectrum, that deploys IPv6-compatible addresses into 6LoWPAN networks in a distributed manner. Spectrum creates the virtual coordinate system on the network and deploys addresses based on the location of the nodes. The deployment policy based on the virtual locations of the nodes reduces the DAD cost in the initial configuration as well as the cost for additional configurations of newly arrived nodes. The authors implemented and tested the proposed scheme in a real environment. Simulations and experiments confirmed a reasonable message cost for both stateful and stateless autoconfigurations.</P>
Scarred scalp reconstruction with a rectangular expander
Shin, Hyojeong,Shin, Jeonghwan,Lee, Jun Yong Korean Cleft Palate-Craniofacial Association 2020 Archives of Craniofacial Surgery Vol.21 No.3
Scalp reconstruction is challenging because the scalp is inelastic, stiff, and has hair follicles. Tissue expansion offers aesthetically pleasing outcomes with minimal donor-site morbidity. However, in a scarred scalp, the extent of possible dissection for the expander insertion may be limited and surgeons must make use of the limited scalp tissue. We successfully reconstructed scarred scalps using rectangular expanders. This report presents two cases: a 4×3 cm chronic defect with widespread scarring and osteomyelitis and an 11×7.5 cm scar tissue following a skin graft. Tissue expanders were inserted in the subgaleal plane and were inflated by 195 mL and 400 mL over periods of 2 and 3 months, respectively. Subgaleal elevation of a fasciocutaneous flap was achieved with the expanded tissue. The defects were well covered, with good color, texture, and hair-bearing tissue. There were no complications involving the tissue expanders. Rectangular expanders yield more available tissue than round or crescent-shaped expanders. Moreover, since the base of the flap is well defined, the expander can be easily inserted in a limited space. Therefore, rectangular expanders are recommended for the reconstruction of scarred scalps.
FEM 시뮬레이션을 이용한 FZP 집속 빔 생성에 관한 연구
신효정(Hyojeong Shin),조성종(Sungjong Cho),정현조(Hyunjo Jeong),최성호(Sungho Choi) 한국비파괴검사학회 2020 한국비파괴검사학회지 Vol.40 No.2
고체 재료의 비선형 파라미터 측정에서 펄스-에코법으로 단일 평면형 탐촉자를 사용하는 경우 응력 자유 경계면에서 반사 전, 후에 생성된 제2고조파는 위상 차에 의해 서로 상쇄되어 측정이 어렵다. 그러나, 집속 빔을 이용하면 제2고조파의 진폭을 증가 시킬 수 있음이 이전의 연구에서 보고된 바 있다. 본 논문에서는 펄스-에코 모드에서 비선형 파라미터 측정을 위해 고체 시편 내부에 집속 빔을 생성하기 위한 연구를 수행하였다. 프레넬 존 플레이트 원리를 이용해 평면을 갖는 고체 시편에 집속 빔을 생성하고 이를 비선형 파라미터 측정에 적용하기 위하여 이론해석 및 시뮬레이션을 수행하였다. 해석 결과에 따르면 고체 시편 내부에 집속 빔 생성이 가능함을 확인할 수 있었다. 또 집속 위치, 수신 방법 등을 고려하고, 집속 빔의 음장, 수신 신호 파형 등의 분석을 실시하였으며, 이러한 결과로부터 고체의 비선형 파라미터 측정에 집속 빔을 이용할 수 있을 것으로 판단된다. When nonlinear parameters of solid samples are measured in the pulse-echo mode using a single planar transducer, destructive second harmonic waves are generated before and after the stress-free reflection boundary owing to their phase differences, which make the nonlinear parameters difficult to measured. Previous studies have reported that the second harmonic wave amplitude can be increased using a focused beam. To measure nonlinear parameters in the pulse-echo setup, simulation studies focused beam generations in solid specimens were performed. The behavior of a focused beam generated by the Fresnel zone plate principle was investigated through theoretical analysis and finite element simulation. The simulation results showed that the focusing beam could be generated inside the solid sample. The focus position and reception method were also considered to examine the waveform behavior, It was found that the focused beam method can be utilized for nonlinear parameter measurements of solids in the pulse-echo method.