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정의환(Eui-Hwan Jung),허준(Jun Heo),윤재훈(Jae-Hun Yoon),임기조(Kee-Joe Lim),이홍규(Hyung-Kyu Lee) 대한전기학회 2009 전기학회논문지 Vol.58 No.11
In this paper, each specimen blended at weight proportions of 80% HDPE to 20% EVA, 70% HDPE to 30% EVA, 60% HDPE to 40% EVA, and 50% HDPE to 50% EVA was manufactured respectively. The insulation performances of the proposed insulator were compared with conventional XLPE, main insulating material of CV cable on the basis of the investigation results of DC insulation performances. From the space charge density, electric field and potential profiles with raising DC voltage and time variation in HE82, distortion of electric field distribution was improved. As EVA mixed into the bulks acts as nucleation in crystallization process of HDPE, the size of spherulites became decreased and finally formed continuous network structure. Ultimately, it resulted from extinction of space charge in the interfacial region of spherulites.
수축력과 신장력을 병용한 골신장술에서의 다양한 힘의 비와 부여시기에 따른 신연골 반응
김욱규,신상훈,정인교,김철훈,허준,윤일,Kim, Uk-Kyu,Shin, Sang-Hun,Chung, In-Kyo,Kim, Cheol-Hun,Huo, Jun,Yun, Il 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.5
The purpose of this study was to identify the effectiveness of the modified distraction osteogenesis (DO) method with the concept of overdistraction and compression stimulation which have been previously suggested by the authors in 2002 and to explore the optimal distraction-compression ratio and appropriate latency period for the compression force application during consolidation. The experimental specimens were assessed with radiography, histologic findings, and dual energy x-ray absorptiometry (DEXA) after the conventional DO method and the modified DO technique had been applied on rat mandibles. Total 60 rats were used for the study. In experimental group of 54 adult rats, mandibular osteotomies between the first and second molar areas were performed and customized external distractors were applied. The surgeries on 6 rats of control group also were done with same osteotomy technique and DO device application. Final amount of distraction was set-up as 2 mm on both groups. But, in a experimental group of 54 rats, distraction osteogenesis with a compression force were performed with the different distraction-compression ratio and variant latency periods for compression. The three ratio-subgroups were made as distraction 4 mm group with compression 2 mm, distraction 3 mm group with compression 1 mm, and distraction 2.5 mm group with compression 0.5 mm. In addition, The three subgroups with 3, 7, 11 days latency period prior compression were allocated on each ratio-subgroups. Total 9 subgroups consisted of 6 rats on each subgroup. In control group of 6 rats, conventional distraction technique were routinely performed. The rats of control groups were sacrificed on postoperative 3, 6 weeks after 2 mm distraction. The rats in the experimental groups also were sacrificed on the same euthanasia days of control groups to compare the wound healing. Final available specimens were 55 rats except 5 due to osteomyelitis, device dislodgement. Distraction-compression combined group on 6 weeks generally had showed increased bone mineral density than the same period group of conventional distraction technique on the DEXA study. More matured lamellar bone state and extended trabecular pattern in the combined group than those of control group were also observed in the histologic findings on 6 weeks. In the distraction-compression combined groups, the bone density of 2.5 mm distraction subgroups with 0.5 mm compression showed the highest value on the DEXA study among various force ratio groups. In the distraction-compression combined groups, the bone density of 3 day latency period subgroups showed the highest value on the DEXA study among various latency period groups for the compression application. From this study, we could deduce that 1/5 force ratio for the compression versus distraction, 3 day latency period prior compression application would be the most effective condition if modified distraction osteogenesis technique might be applicable. The modified DO method with a compression force may improve the quality of bone regenerate and shorten total treatment period in comparison with conventional DO technique clinically.
박충헌(Park, Choong-Hun),이재영(Lee, Jae-Young),김성일(Kim, Seong-Il),허준(Jun, Heo) 한국방송·미디어공학회 2011 한국방송공학회 학술발표대회 논문집 Vol.2011 No.7
본 논문에서는 초고속 근거리 무선전송을 위한 60GHz 시스템에서 릴레이를 이용한 협력통신 기법을 제안한다. 60GHz대역은 LOS(Line-Of-Sight)가 보장되어 있지 않은 경우에 거리에 따른 신호 감쇄가 심하여 릴레이를 이용한 협력 통신 기법이 효과적이다. 릴레이를 이용한 협력통신 방법은 크게 증폭 후 전송(AF)과 복호 후 전송(DF)의 두 가지 프로토콜로 나누어지며, AF프로토콜은 Soft information을 보낼 수 있다는 장점이 있고 DF프로토콜은 릴레이에서 복호 후 데이터를 보낸다는 점에서 부호화 이득을 얻어 낼 수 있다는 장점이 있다. 또한 AF와 DF의 장점을 결합한 복호 후 증폭 전송(DAF)프로토콜이 소개되었고 이에 대한 분석이 이루어졌다. 이에 본 논문은 60GHz 시스템과 AWGN, Rayleigh 페이딩환경에서 AF프로토콜에 대한 DAF프로토콜의 성능 이득을 보이고 비교한다.
고재웅,조형훈,양성원,허준,Jae Woong Koh,Hyung Hun Cho,Sung Won Yang,Jun Her 대한안과학회 2006 대한안과학회지 Vol.47 No.9
Purpose: To report cases of corneal perforation among corneas treated with cyanoacrylate tissue adhesive. Methods: We performed cyanoacrylate tissue adhesive application on 1 case of corneal perforation due to fungal keratitis, one case of corneal perforation due to neurotrophic keratitis, one case of corneal fistula due to foreign body and one case of corneal perforation due to corneal stromal dystrophy. After cyanoacrylate tissue adhesive removal, amniotic membrane transplantation was conducted in two cases, and keratoplaty was performed in another two cases. Results: Postoperative follow-up period was 12 months on average. In all four cases, ocular integrity was successfully restored. There was no sign of recurrence, infection or inflammation. Conclusions: Cyanoacrylate tissue adhesive monotherpy can restore ocular integrity successfully in various type of corneal perforation and After cyanoacrylate tissue adhesive removal, amniotic membrane transplantation and keratoplaty can be performed additionally.