개선된 고속 제곱 발생기 설계

송상훈,Song, Sang-Hoon 한국정보처리학회 2000 정보처리논문지 Vol.7 No.1

제곱 테이블을 이용한 곱셈 방법은 처리과정을 간단히 하고 속도도 향상시킨다. 그러나, 비트 길이가 증가함에 따라 테이블 크기는 지수 승으로 증가하게 된다. 최근에 Wey와 Shieh는 고속 곱셈이 요구되는 응용분야에 적합한 폴딩 기법을 이용한 우수한 제곱 발생기를 제안하였다. 이 기법은 ROM 주소에 대한 1의 보수 값을 이용하여 제곱 값을 위한 거대한 테이블을 계속 폴딩함으로써 필요한 테이블의 크기를 작게 만들어 ROM의 크기를 줄일 수 있도록 한다. 본 논문에서는 Wey와 Shieh의 기법에서 1의 보수 부분이 필요 없는 개선된 폴딩 기법을 제안한다. 그리고 제안된 방법은 중간 과정에서 필요한 부분 합의 비트 길이를 줄임으로써 하드웨어 구현을 쉽게 하고 성능을 더욱 향상시킨다. The square-based multiplication using look-up table simplifies the process and speeds-up the operating speed. However, the look-up table size increases exponentially as bit size increases. Recently, Wey and Shieh introduced a noble design of square generator circuit using a folding approach for high-speed performance applications. The design uses the ones complement values of ROM addresses to fold the huge look-up ROM table repeatedly such that a much smaller table can be sufficient to store the squares. We present new folding techniques that do not require a ones complement part, one of three major parts in the Wey and Shiehs method. Also the proposed techniques reduce the bit size of partial sums such that the hardware implementation be simplified and the performance be enhanced.

이동 에이전트 통신을 위한 효율적인 위치 추적 방법

송상훈,Song, Sang-Hoon 한국정보처리학회 2004 정보처리학회논문지 A Vol.11 No.5

이동 에이전트에 대한 위치 추적 기능은 네트워크에서 움직이는 개체에 메시지를 전달하기 위한 것이다. 대부분의 위치 추적 방법들은 이동 에이전트의 현재 위치 정보를 가지고 있는 릴레이 노드를 사용하여 메시지를 전달할 수 있게 한다. 본 논문은 도메인 기반의 프록시를 이용한 효율적인 위치 추적 방법을 제안한다. 이동 에이전트들이 이동 할 호스트를 무작위로 결정하지 않고 같은 도메인에 있는 호스트들을 먼저 방문하는 특징을 이용하여 위치 정보 등록 비용과 메시지 전달 비용을 최소화하는 것이다. 도메인 기반 프록시는 위치 정보 등록 비용을 줄이는데 효과적이지만, 프록시 체인의 길이가 길어지면 메시지 전달 비용을 높일 수 있는데 프록시 체인의 길이를 압축 시켜 메시지를 효율적으로 전달하는 방법을 제안한다. The provision of location tracking for mobile agents is designed to deliver a message to a moving object in a network. Most tracking methods exploit relay stations that hold location information to forward messages to a target mobile agent. In this paper, we propose an efficient location tracking method for mobile agents using the domain-based proxy as a relay station. Mobile agents can reduce the length of their migration paths by visiting hosts in the same domain first, rather than selecting hosts randomly. The proposed method exploits the domain-based moving patterns of mobile agents and minimizes registration and message delivery costs. Since the long proxy chain can contribute to the high message delivery cost, we also propose a compressing method to reduce the message delivery cost.

지급자재 조달관리부담 평가에 기초한 중소기업 공사용자재 직접구매제도 대응방안: 공공아파트를 공급하는 발주자를 중심으로

송상훈,방종대,손정락,Song, Sang-Hoon,Bang, Jong-Dae,Sohn, Jeong-Rak 한국토지주택공사 토지주택연구원 2013 LHI journal of land, housing, and urban affairs Vol.4 No.4

중소기업청은 일정규모 이상의 공공건설사업에 대해 일반공사와 의무적으로 분리하여 직접 구매해야 하는 123개 공사용자재 제품군을 지정하고, 법에서 정한 바에 따라 발주기관이 자재를 직접 구매하여 수급인에게 공급하도록 하고 있다. 본 연구에서는 이러한 공사용자재 직접구매제도 하에서 공공아파트 건설 현장에 투입되는 지급자재가 지니는 다양한 특성과 관리요인을 발주자 입장에서 종합적으로 고려하여, 주요관리대상 자재를 파악하고, 자재 조달 프로세스를 기반으로 이들에 대한 적정 관리 방안을 제시하였다. 즉, 조달경로, 현장특화정도, 입주자 요구수준, 업체 책임범위, 납품분할정도, 현장작업 요구도, 부속자재 필요도, 검수조건 등 지급자재가 가지는 주요 관리요인을 적용하여 공공아파트 건설사업에 적용되는 43개 직접 구매 대상품목의 조달관리부담을 평가한 결과, 상대적으로 높은 조달관리노력이 요구되는 주요관리대상그룹에는 목재창호, 알루미늄창호, 승강기, 목재마루재, 레미콘, 타일, 합성수지창호가 포함되었고, 그 중 알루미늄창호와 타일은 집중관리대상으로 분류되었다. 나아가 직접구매제도의 영향에 따른 집중관리대상 자재에 대한 대응방안은 발주자 입장에서 실태, 문제점, 관리측면의 주요 고려사항을 반영하여 작성하였으며, 실질적 수량 산출, 명확한 발주세부조건 정비, 생산 전후 활동 활성화, 하자보수 물량 확보, 공종별 간섭 사전 협의 및 해소 등이 필수적인 관리활동으로 나타났다. The Small and Medium Business Administration specified 123 construction materials mandatory to purchase directly and forced the public owners to provide the contractors with materials as required by related law. This study extensively reviewed various characteristics and management factors of the owner-providing materials consumed in the public apartment housing under Direct Buying System(DBS) from the public owner's perspective. Subsequently, the major managed materials were identified, and the proper response plan was developed along the material procurement process. The Procurement Management Load Indices (PMLI) of 43 materials were evaluated according to rating criteria with procurement path, project-specified level, user requirement level, supplier's responsibility, on-site work requirement, additional parts, and inspection standards. The tile and aluminum windows were classified in the group needing high-level procurement efforts to reduce the errors and ensure the efficiency. The accurate quantity estimation method, definite purchase details, management activity definition before and after production, additional quantity for rework, interference coordination were defined as the essential activities for effectively responding to DBS.

폐기물매립지의 메탄 배출량 측정 정확도 향상을 위한 시·공간적 배출 특성 고찰

송상훈 ( Sang-hoon Song ),김란희 ( Ran-hui Kim ),이남훈 ( Nam-hoon Lee ),박진규 ( Jin-kyu Park ) 한국폐기물자원순환학회 2022 한국폐기물자원순환학회지 Vol.39 No.6

First-order decay models have been used to estimate annual landfill methane emissions for national greenhouse gas inventories. These models vary greatly. Inaccurate input values or oversimplified processes, such as methane oxidation or dynamic methane emission rates, cause this downside. Direct field measurements can be used to predict total methane emissions more accurately. Methane emission rates fluctuate weekly and daily and are influenced by the soil cover and meteorological conditions such as barometric pressure, temperature, rain, and wind speed. Hotspot emissions contribute significantly to landfill methane emissions. To accurately estimate annual methane emissions, direct field measurements must account for meteorological effects and quantify hotspot emissions during landfill emission monitoring programs. In South Korea, there are no field-based calculations, hampering the development of a strategic strategy to reduce methane emissions from solid waste landfills. South Korea must develop innovative methods to quantify landfill methane emissions and a mitigation strategy.

공공주택 건설사업에 대한 직할시공방식 적용이 건설산업에 미치는 예상효과와 추진방향 분석

송상훈(Song, Sang-Hoon),손정락(Sohn, Jeong-Rak),방종대(Bang, Jong-Dae),신동우(Shin, Dong-Woo),김기현(Kim, Ki-Hyun) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.10

The direct construction control method(DCCM) is based on the direct contract between owner and specialty contractors without involvement of a general contractor. The application of the DCCM, originally, aimed to cut down the public rental apartment price, and the introduction of DCCM to public construction has gained a plenty of attention from the construction sector as it causes major change in current production and profit structure. The purpose of this study was to suggest its application strategy to public construction projects based on the various opinions about DCCM collected from the survey targeting related stakeholders. The results of survey showed that the DCCM is expected to be relatively inefficient in project performance area. Despite its strength over the cost aspect, many respondents expect that it has a negative effect on the time, quality, safety, and environment performance. However, DCCM is considered to contribute to enhancing the competitiveness of constructors and reinforcing fair trading with transparency. As the preparation stage, the DCCM is suggested to be continuously applied mainly with the small-scale projects till the technical capability is ensured along with legal amendment.

사용종료매립지의 사후관리종료기준에 관한 고찰

송상훈 ( Sang-hoon Song ),김란희 ( Ran-hui Kim ),이남훈 ( Nam-hoon Lee ),박진규 ( Jin-kyu Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회지 Vol.38 No.2

This paper aims to review the aftercare completion criteria for closed landfills described in the literature. Our objectives are to characterize the waste stabilization phases and specific approaches to evaluate the completion of landfill aftercare and to review country-specific regulatory procedures and technical guidelines. The attainment of functional stability implies that a closed landfill does not pose a threat to human health and the environment in the absence of active aftercare control. The functional stability can be assessed according to three categories: (1) target values, (2) risk assessment, and (3) performance-based. Country-specific aftercare completion criteria should be developed with consideration of functional stability in Korea. Due to the limitations on the deposition of combustible materials in Korea, soil and groundwater impact by leachate emissions are more strictly monitored and controlled than landfill gas emissions. However, the maximum leachate head on a liner (as measured at the lowest point of the liner) for solid waste landfills is limited to 2.0m during the aftercare period in Korea. Thus, the leachate head needs to be eliminated at the time of aftercare completion.

신축 건설현장 폐기물 저감 및 적정처리 방안

송상훈(Song Sang-Hoon),손정락(Son Jeong-Rak) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.1

One of the crucial factors in managing wastes on construction site is to prepare the solution to minimize them as well as to dispose of them appropriately. The method of reduction and proper collection and disposal for waste is still required although the recycle ratio has been improved since the legislation to promote recycling construction waste was enforced. Therefore, this study aimed to benchmark the current practice conducted to control on-site waste in Japan. In benchmarking process, the Zero-Emission(ZE) movement was fully reviewed through literature analysis, expert interview, and site investigation. ZE is composed of four phases according to PDCA cycle. In planning stage, the strategy and detailed action plan are established including a reduction objective, 3R(reduce, reuse, recycle) plan, and disposal plan. In rest of stages, the managers on site set up a facility for collection, execute field education, continuously monitor the status, and take actions to enhance the performance. The application of these Zero-Emission activities to our domestic sites is expected to contribute to decreasing on-site waste and ultimately reinforcing the Green Construction by mitigating environmental load during construction phase.

신축아파트 건설현장 폐기물처리용역 분리발주제도 운영 개선방안

송상훈(Song, Sang-Hoon),박성식(Park, Seong-Sik) 대한건축학회 2013 대한건축학회 학술발표대회 논문집 Vol.33 No.1

CJ의 트랜스지방 저감화 전략 및 전망

송상훈(Sang-Hoon Song) 한국식품과학회 2007 식품과학과 산업 Vol.40 No.1

호기성 폐기물매립지의 온실가스 감축효율 및 메탄보정계수(MCF) 평가

송상훈 ( Sang-hoon Song ),고준혁 ( Jun-hyeok Ko ),박상흠 ( Sang-heum Park ),김란희 ( Ran-hui Kim ),김상민 ( Sang-min Kim ),이남훈 ( Nam-hoon Lee ),박진규 ( Jin-kyu Park ) 한국폐기물자원순환학회 2021 한국폐기물자원순환학회지 Vol.38 No.4

This study aims to analyze greenhouse gas (GHG) emissions reductions in anerobic municipal solid waste (MSW) landfills to evaluate the efficiency of active aeration in the reduction of GHG and to verify the accuracy of the methane correction factor (MCF) reported in the 2019 Refinement (i.e., 0.4). Experimental results revealed that the GHG reduction efficiency was 61.1%, which is slightly lower than that reported in literature. However, under the assumption that active aeration was applied to all MSW landfills in Korea in 2018, this finding indicates that active aeration reduced GHG emissions by 4.7 million tons of CO₂eq., which is approximately equivalent to 60% of the emissions from the MSW landfills. This corresponds to the 2030 GHG reduction target of Korea’s waste sector. This indicates that the application of active aeration to MSW landfills is essential for reducing GHG emissions from the waste sector. The calculated MCF of the landfill with a methane concentration of 5% or less under aerobic conditions was 0.31 to 0.34, which is lower than the MCF default value suggested in the IPCC guideline (i.e., 0.4). However, further research on MCF in aerobic landfill should be conducted.