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IEEE 802.11s 6-Address 구조를 이용한 On-demand 방식 단말 위치 관리기법
장정훈,공종민,김종덕,Jang, Jeong-Hun,Kong, Jong-Min,Kim, Jong-Deok 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.4
무선 메쉬 네트워크는 멀티홉으로 구성된 무선 백본 네트워크 기술이다. 이러한 네트워크에서 단말에게 서비스를 제공하기 위해서는 단말 위치관리는 필수적이다. IEEE 802.11s 표준에서는 두 가지 방법의 위치관리 기법을 제시하고 있다. 하지만 제시하고 있는 기법은 불필요한 제어 메시지 발생, 비효율적인 위치정보 유지, 추가적인 지연시간 발생 등의 단점을 지니고 있다. 본 논문은 일반 트래픽의 6-Address 구조에 담겨 있는 위치정보를 사용하여 On-demand 형태로 작동하는 이동단말의 위치정보 관리기법을 제안한다. 제안방법을 실제 구현을 통해 검증하였으며, 시뮬레이션을 통해 성능을 비교 해보았다. 분석과 실험 결과를 통해 위치정보 갱신을 위해 발생한 제어 메시지의 감소, 전송을 위한 지연시간 단축 등의 결과를 보여주었다. Wireless mesh networks(WMNs) are wireless backbone networks technology consisting of a multi-hop routers. Location management is essential to provide a service to the terminal in WMNs. IEEE 802.11s standards have two basic location management scheme for location management - the proxy registration procedure and the associated station discovery protocol. These basic schemes, however, suffer from serious drawbacks including redundancy control message, ineffective location information maintenance, additional delay time. This paper propose an on-demand station location management scheme using 6-address structure of IEEE 802.11s. Through analysis and experimental evaluation on simulation, we show that proposal scheme reduce control message and forwarding delay time.
장정훈,김영호,서명환,박민현,김영호,이준호,오승하,장선오,김종선 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol. No.
Background & Objectives: Surgical indications and effect of auditory rehabilitation have not been established in elderly deaf patients who received cochlear implant (CI). The aim of this study is to analyze the outcomes of CI with respect to auditory performance and surgical complication in elderly deaf patients. Subjects & Method: Nineteen postlingually deafened patients who were 60 years and older at the time of implantation were included in the study from April 1992 to October 2006. They were compared to a group of 53 younger patients (<60 years) at the time of implantation. Surgical complications were identified and speech performance was evaluated preoperatively and postoperatively at 1 month, 3 months, 6 months, 1 year and 2 years. Results: In the etiology, progressive hearing loss was most common in both groups. Perioperative complications such as temporary dizziness, wound problem, tinnitus, and temporary facial weakness showed no significant differences between elderly and control groups despite higher incidence of underlying disease in elderly patients. Preoperative speech performance (audiologic K-CID) was significantly better in control group than in elderly group, but there were no significant differences in postoperative period. Conclusions: The outcomes of CI in the elderly patients have been comparable with those of younger adults. Advanced age alone could not preclude anyone from being candidates of CI.
Production of Bioactive Compounds from Fungi Grown on Ginseng- Steaming Effluent
장정훈,김재호,김나미,김하근,이종수 한국미생물·생명공학회 2010 한국미생물·생명공학회지 Vol.38 No.2
We described production of bioactive compounds from fungi grown on Korean ginseng-steaming effluents (GSE) for develop high-value added nutraceuticals from Korean GSE. Hansenula anomala KCCM 11473,which grew well in Korean GSE had high RNA content, and its optimal autolysis conditions were established to produce 5’-ribonucleotides (13.9~28.5 mg/g of biomass) at 55oC and pH 5.0 for 24 h. 5’-Phosphodiesterase and adenyl deaminase were not effective in increasing the yield of 5’-ribinucleatides, but the yield of IMP increased significantly only after the addition of 1.0% adenyl deaminase. Saccharomyces cerevisiae showed the highest growth in the GSE medium. 267.1 mg of S. cerevisiae biomass was produced from 1 g of GSE solid and medicinal ginsenoside-Rg3 contents was determined with 0.033 mg. Mucor miehei KCTC 6011 produced approximately 120 mg of chitosan per g-dry mycelium in 84 h at 25oC when grown in the GSE (pH 8.0)supplemented with 0.5% yeast extract and 0.002% CuSO4. Chitosan produced by M. miehei KCTC 6011 have deacetylated approximately 56% and its viscosity and molecular weight of the chitosan were 80 cps and 1.07 x 103 kDa, respectively. The chitosan at 1.5 mg/ml inhibited 73.9% of the mycelium growth of Rhizotonia solani in 60 h.
장정훈,박민현,송재진,이준호,오승하,김정선,창선오 대한의학회 2015 Journal of Korean medical science Vol.30 No.1
This study compared long-term speech performance after cochlear implantation (CI)between surgical strategies in patients with chronic otitis media (COM). Thirty patientswith available open-set sentence scores measured more than 2 yr postoperatively wereincluded: 17 who received one-stage surgeries (One-stage group), and the other 13underwent two-stage surgeries (Two-stage group). Preoperative inflammatory status,intraoperative procedures, postoperative outcomes were compared. Among 17 patients inOne-stage group, 12 underwent CI accompanied with the eradication of inflammation; CIwithout eradicating inflammation was performed on 3 patients; 2 underwent CIs via thetranscanal approach. Thirteen patients in Two-stage group received the completeeradication of inflammation as first-stage surgery, and CI was performed as second-stagesurgery after a mean interval of 8.2 months. Additional control of inflammation wasperformed in 2 patients at second-stage surgery for cavity problem and cholesteatoma,respectively. There were 2 cases of electrode exposure as postoperative complication in thetwo-stage group; new electrode arrays were inserted and covered by local flaps. The opensetsentence scores of Two-stage group were not significantly higher than those of Onestagegroup at 1, 2, 3, and 5 yr postoperatively. Postoperative long-term speechperformance is equivalent when either of two surgical strategies is used to treatappropriately selected candidates.
므네모시네의 (재)해석을 통한 도시 관계 구축 방법에 관한 연구
장정훈,박희영,이길임,조승구 대한건축학회지회연합회 2010 대한건축학회연합논문집 Vol.12 No.3
현대 도시는 개체가 지니고 있는 의미의 해석보다, 외부로 드러나는 이미지에 대한 해석이 주류를 이루고 있다. 이에 현대 도시는 그것을 이루고 있는 요소들 간의 관계가 불명확하고 모호한 성격을 지니고 있다. 이에 본 연구는 도시를 해석함에 있어 물리적인 요소가 아닌 비-물리적인 요소인 ‘기억’과 그것을 통해서 도출된 ‘상징’을 통해서, 도시에 잠재되어 있는 의미를 읽어내고 해석하는 방법론으로 아비 바르부르크의 ‘므네모시네’ Atlas를 제안한다. 그리고 ‘므네모시네’ Atlas의 특징을 ‘복합성(Complexity)’, ‘이중성(Duplicity)’ ‘동시성(Simultaneity)’으로 분류하고, 이러한 특징들을 통해서 도시 관계를 재구축하기 위한 새로운 해석의 틀(frame)을 제시한다. 또한 이론적인 부분에서 도출된 복합성, 이중성, 동시성을 설계작업에 적용하기 위하여, 도출된 특징을 각각 ‘압축(Compact)’, ‘긴장(Tension)', '열림(Openness)'으로 각각 치환하고, ‘므네모시네’ Atlas를 적용한 설계안을 제안한다.