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成(성) 연간기획 김영철 : 지방공기업법개정으로 지방공사채 특수채 지위부여
김영철 한국지방재정공제회 2014 지방재정 Vol.2014 No.3
지난 6월 3일 지방공기업법 일부 개정법률이 시행되었다. 이번 일부 개정법률에는 그 동안 안전행정부와 지방공사의 숙원이었던 공사채의 특수채 지위 부여가 담겨있다. 이번 법개정으로 지방공사들은 앞으로 채권시장에서 금리수준이 회사채에 비해 낮게 형성되고, 집합투자자의 투자한도가 상향되면서 지방공사의 부채감축 및 재정건전화에 기여할 것으로 기대된다.
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다중경로 페이딩 채널에서 하이브리드 SC/MRC-$L_{c}/L$ 다이버시티 수신 Multi-Carrier DS-CDMA /BPSK 신호의 성능 해석
김영철,조성준 한국전자파학회 2001 한국전자파학회논문지 Vol.12 No.4
In this paper, the performance of a Multi-Carrier DS-CDMA system with Hybrid $SC/MRC- L_{c}/L$ diversity in the multipath Rayleigh fading environment is analyzed and compared with that of a Wideband DS-CDMA system. Each carriers of the number of the input diversity branches in the Multi-Carrier DS-CDMA system is L and among L, the branches of $L_c$ are chosen to be maximum-ratio-combined. And the diversity outputs are coherent-detected and despread by the correlator of each carrier. As the result, we have known that the structure of the Wideband DS-CDMA system with Hybrid $SC/MRC-L_{c}/L$ diversity reception becomes simple due to no synchronization of bit or phase and in terms of the error performance, the performance of Hybrid $SC/MRC- L_{c}/L$ diversity is better than that of selection diversity, but worse than that of MRC diversity. Moreover, the performance of a Multi-Carrier DS-CDMA system is better than that of a Wideband DS-CDMA system in multipath Rayleigh fading channel since Hybrid $SC/MRC- L_c/L$ diversity can obtain gain from each diversity branch. In case four carriers are used and required BER is $10^{-6}$ in wireless data communication, Hybrid SC/MRC-2/4 diversity can increase more 17 users than Hybrid SC/MRC-2/3 diversity because the better input branches can be selected through increase of input branches.
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김영철,박근태,이상민,김홍연,김영균,Kim, Y.C.,Park, K.T.,Lee, S.M.,Kim, H.Y.,Kim, Y.K. 한국전자통신연구원 2007 전자통신동향분석 Vol.22 No.6
최근에 블로그, UCC, IPTV 등 사용자 중심의 인터넷 서비스와 언제 어디서나 웹을 통해 서비스를 받을 수 있는 유비쿼터스 컴퓨팅 환경으로의 변화는 대용량 저장 공간과 빠르고 안정된 서비스를 제공할 수 있는 대규모 클러스터 시스템 플랫폼을 필요로 한다. 그리고 이러한 대규모 클러스터 시스템 플랫폼을 효율적으로 관리하고 이용할 수 있는 클러스터 파일 시스템은 필수적이다. 본 고에서는 최근에 연구 개발되고 있는 클러스터 파일 시스템들을 소개하고 기술 동향에 대해 살펴본다.
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김영철,여성철,김진평,박정제 대한이비인후과학회 2020 대한이비인후과학회지 두경부외과학 Vol.63 No.2
Primary thyroid lymphoma is a rare malignancy that can grow rapidly and compress the airway. In such cases, a tracheostomy or thyroidectomy is generally required. Here, we report a case of a 76-year-old woman diagnosed with primary thyroid diffuse large B-cell lymphoma (DLBL), with dyspnea attributed to tracheal compression by the enlarged thyroid. The patient’s poor general condition meant that thyroidectomy was considered challenging. Therefore, a temporary endotracheal silicone stent was successfully inserted to maintain the airway, as tracheal stenting has been shown to be an effective treatment for both benign and malignant obstructive airway diseases. We conclude that, in patients with primary thyroid DLBL who present with airway compression but are not eligible for surgery, tracheal stent insertion can maintain the airway and allow time for chemotherapy to be administered.
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다중경로 라이시안 페이딩 채널에서 Multi-Carrier DS-CDMA 시스템의 성능 해석
김영철,노재성,오창헌,조성준 한국전자파학회 2001 한국전자파학회논문지 Vol.12 No.3
In this paper, it is analyzed that the error performance of a Multi-Carrier DS-CDMA system in a single cell with multipath Rician fading and multiple access interference (MAI) and the error performance of the system is compared with that of a Sing1e-Carrier DS-CDMA system. Moreover, the convolutional coding techniques with code rate of 1/2, 1/3, and 1/4 are adopted in order to improve the error performance degraded by the multipath fading and MAI and performance improvement through the coding techniques is analyzed. As a result, it is shown that the number of users in each system can be determined by the number of branches of the rake receiver in a Single-Carrier DS-CDMA system and the number of carriers in a Multi-Carrier DS-CDMA system. Furthermore, the convolutional coding should be chosen with considering the trade-off between coding gain and a power limitation in a Multi-Carrier DS-CDMA system. In case of increasing the number of carriers, the processing gain is decreased but the error performance is improved through the effect of frequency diversity and the system can be possibility implemented due to the low chip rate.
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김영철,김대욱,안승준,김호섭,박성순,박경완,황남우,Kim, Young-Chul,Kim, Dae-Wook,Ahn, Seung-Joon,Kim, Ho-Seob,Park, Seong-Soon,Park, Kyoung-Wan,Hwang, Nam-Woo 한국광학회 2007 한국광학회지 Vol.18 No.6
We have fabricated a magnetic micro-deflector for a microcolumn system and tested its performance by operating it in the low energy region. The micro-deflector is composed of Cu coils around cylindrical cores with $500{\mu}m$ diameter. The diameter of the Cu coil itself is $100{\mu}m$. Two pairs of deflectors designed for a 2-dimensional scan, that is X and Y deflection, are fixed on an insulating plate. The low power performance of a magnetic micro-deflector attached to a microcolumn system has been tested and the magnitude of deflection is measured to be ${\sim}100{\mu}m/A$, which offers the possibility for practical applications of the magnetic micro-deflector.
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Pediatric Solitary Fibrous Tumor of the Sublingual Gland with Malignant Potential
김영철,여성철,이상하,이종실,김진평,박정제 대한이비인후과학회 부산,울산,경남 지부회 2018 임상이비인후과 Vol.29 No.1
Solitary fibrous tumor(SFT) is an unusual primary mesenchymal spindle cell tumors, most commonly arising in the pleura. Although the majority of these tumors exhibit benign behavior and have a good prognosis, but minority of patients with these tumors are at risk for local recurrence and distant metastaseis. Recently, we experienced a rare case of 12-years-old pediatric SFT patient arising in the sublingual gland, which shows histopathologically malignant potential. So we report this case with a review of literatures.
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