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윤성철,김상욱,배성일,강성호,김용천,정승재,김상우,문상훈,Yun, Seong-Cheol,Kim, Sang-Uk,Bae, Seong-Il,Gang, Seong-Ho,Kim, Yong-Cheon,Jeong, Seung-Jae,Kim, Sang-U,Mun, Sang-Hun 대한전자공학회 2002 電子工學會論文誌-SD (Semiconductor and devices) Vol.39 No.2
A new high-performance DSP architecture is proposed, which behaves as a coprocessor of a 32bit microcontroller. Because the proposed DSP architecture is a dual MAC(Multiply and Accumulate) DSP architecture, it can process efficiently a number of SOP(sum of product) operations used in many DSP applications. In order to efficiently perform other operations such as pure additions without any restriction, a MAC is composed of a multiplier and a ALU placed in parallel. In addition, it is a 3-way superscalar architecture, which can issue 3 instructions at a time. The benchmark results with 3 thor dual MAC DSPs show that the proposed DSP has the best performance. Futhermore, it is proven that the proposed DSP is more efficient in memory usage, although the performance is comparable in some algorithms such as Viterbi decoding and FFT butterfly. 이 논문은 저전력 마이크로 컨트롤러의 coprocessor로 동작하는 고성능 DSP의 아키텍쳐 구조를 제안한다. 제안된 DSP 아키텍쳐는 DSP 응용 분야의 기본 수식인 곱의 합을 고속으로 수행할 수 있도록 MAC(Multiply and Accumulate) 유닛 두 개를 갖는 dual MAC 아키텍쳐 구조이면서, 곱셈기와 덧셈기를 병렬적으로 배치시킨 특징을 갖는다. 그리고 한번에 최대 3개의 명령어를 동시에 수행할 수 있으면서도 명령어 길이는 31 비트로 고정된 3웨이 수퍼스칼라 구조를 갖는다. 현재 상용되고 있는 세 개의 DSP들과 의 벤치마크 결과, 제안된 DSP 구조가 가장 좋은 성능을 보여주었다. 또한, 특정 알고리듬에 대해서 성능이 같아도 메모리 사용량에 있어 효율적인 구조라는 것을 보여준다.
위협 모델링 기반 함정 전투체계 보안 요구사항에 관한 연구
윤성철,손태식,Seong-cheol Yun,Tae-shik Shon 한국군사과학기술학회 2023 한국군사과학기술학회지 Vol.26 No.3
The shipboard combat system is a key system for naval combat that supports a command and control process cycle consisting of Detect - Control - Engage in real time to ensure ship viability and conduct combat missions. Modern combat systems were developed on the basis of Open Architecture(OA) to maximize acceptance of latest technology and interoperability between systems, and actively introduced the COTS(Commercial-of-the-shelf). However, as a result of that, vulnerabilities inherent in COTS SW and HW also occurred in the combat system. The importance of combat system cybersecurity is being emphasized but cybersecurity research reflecting the characteristics of the combat system is still lacking in Korea. Therefore, in this paper, we systematically identify combat system threats by applying Data Flow Diagram, Microsoft STRIDE threat modelling methodology. The threats were analyzed using the Attack Tree & Misuse case. Finally we derived the applicable security requirements which can be used at stages of planning and designing combat system and verified security requirements through NIST 800-53 security control items.
식생보호를 위한 한계농도 누적 지표로 본 1998-2002년도의 우리나라 대기권 오존 오염
윤성철 ( Yun Seong Cheol ),김보선 ( Kim Bo Seon ) 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.1
N/A Tropospheric ozone data in Korea for 1998-2002 were analyzed to assess the impact on vegetation. SUM06(sum of hourly concentrations at or above 0.06 ppm) and AOT40(accumulated exposure over a threshold of 40 ppb), widely used as ozone indices in the U.S. and Europe, were calculated based on hourly ozone concentration in 612 areas during 1998-2002 in Korea. SUM06 of the highest 30 areas were 5-12 ppm/hr which were almost the same levels of the U.S. average, and a crop loss of 5% would be expected. Ozone pollution in Seoul during 1998-2002 had decreased compared to that for 1990-97 except in the Northern area; however, ozone pollution in Kyunggi during 1998-2002 had been increased twice compare to the previous 5 years. Korea was divided into four regions: Seoul Metropolitan area, Jungbu, Honam, and Youngnam. Ozone pollution in the Seoul Metropolitan area was much higher during 1998-2000 than the other areas, but ozone pollution during 2001-2002 was almost the same in all four regions. Chunnam-Kwangyang and Kyungbuk-Gumi, famous industrial complexes in southern Korea, were significant ozone pollution areas. However, other industrial complexes, such as Incheon, Ulsan, and Kyunggi-Sihwa, were not polluted compared to their neighbors. Comparing all ozone indices, SUM06(yr), SUM06(3mon), AOT40(yr), AOT40(3mon), number of hours exceeding 100 ppb, 95 percentile, 99 percentile, and maximum concentration, it was determined reasonable to use SUM06(3mon), AOT40(3mon) and number of hours exceeding 100 ppb for evaluation of the chronic impact of ozone on vegetation.
이재철(Lee, Jae-Cheol),권낙원(Kweon, Nak-Won),윤성철(Yun, Seong-Chul) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.10
본 연구는 여중생들에게 봉사체험활동의 일환으로 정기적으로 실시한 노인봉사활동이 그들의 진로발달에 어 떠한 영향을 미쳤는지에 대해 분석하였다. 연구대상은 경기도에 소재한 Y여자중학교에서 인근 노인복지시설에 정기 적으로 봉사활동을 실시한 2학년생 30명이다. 연구도구 및 내용은 진로태도성숙도검사지(CAMI)와 진로결정검사지 (CDS)를 사용하여, 구체적으로 진로태도성숙도의 5가지의 하위요인(결정성, 준비성, 독립성, 목적성, 확신성)과 진로결 정 수준의 변화에 대해 살펴보았다. 연구결과는 첫째, 노인봉사활동이 여중생의 진로태도성숙도의 향상에 부분적인 도움을 주는 것으로 나타났다. 둘째, 노인봉사활동이 여중생의 진로결정수준을 향상시키는데 도움을 주는 것으로 나 타났다. 셋째, 가족단위로 함께 참여했을 경우가 진로태도성숙도와 진로결정수준을 높이는데 보다 효과적인 것으로 나타났다. 본 연구결과로 볼 때, 노인봉사활동을 가족단위로 참여하는 것은 여중생의 진로발달에 도움을 주므로 진로 교육 프로그램을 계획할 때, 관련내용을 포함시키는 것이 효과적일 것으로 사료된다. This study was conducted to analyze the influences of older volunteer activity. In detail, Administered on girl's maddle school students with the program’s purpose on encouragement of positive career development. The study sample was taken from 30 students attending Y girl's middle school in Gyeonggi province, all of whom were regular volunteers at a near by rest home. The contents of the study and apparatus alike incorporated the use of a CAMI and CDS employed as a means of observing the changes before and after older volunteer activity experience in relation to five sub factors and career decision level. The data were analyzed by t-test using the SPSS Program. The results were as follows: First, it appears that older volunteer activity, in general, partial effect of improving a girl's middle school students’ career attitude maturity. Second, it appears that older volunteer activity, improving effect a girl's middle school students’ career decision level. Third, a girl's middle school students’ career attitude maturity and career decision level had positive to advance more in particular in cases where the students’ family also participated in older volunteer activity. As observed by the above results, a older volunteer activity experience should be an integral to a girl's middle school students’ career education program plan as an effective means of enhancing their career attitude maturity and career decision level.