• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.2
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• pp.160-167
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• 2017

The purpose of this study is to identify the possibility of developing the 100% Recycled-resources Absorbent-Pervious Alkali-activated Blocks using both the alkalli-binder and the recycled aggregate. In addition, It established a test method such as Void ratio, compressive strength, coefficient permeability, absorption, and evaporation. As a result, an alkali-activated using recycled aggregate block was able to manufacture an 24 MPa class absorbent-pervious blocks with a liquid type sodium silicate and early high temperature curing. In this case, water-holding capacity, absorption and relative absorption were more effective than the natural aggregates. In conclusion, Absorbent-pervious alkali-activated Block Using recycled aggregate has a surface temperature reducing effect of approximately 10 % compared to ordinary concrete block.

• Ecology and Resilient Infrastructure
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• v.4 no.4
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• pp.187-192
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• 2017

This study evaluated the reduction performance of ambient temperature and the amount of evaporation that takes place depends on the temperature difference of paving blocks which are used in the sidewalk, roadway, parking lot, park, plaza, and etc. The water-retentive block of the LID (Low Impact Development) practice was compared with the conventional concrete block. For the quantitative performance evaluation, experiments were performed in a climatic environment chamber capable of controlling the climatic environment (solar radiation, temperature, humidity, rainfall, and snowfall). The method for performance evaluation was proposed using temperature, humidity, and ambient air of paving blocks which changes according to the solar radiation and the wind speed after the rainfall. As a result, the evaporation amount of the water-retentive block was 2.6 times higher than that of the concrete block, the surface temperature of water-retentive block was $10^{\circ}C$ lower than the concrete block, and the air temperature of water-retentive block was $4.6^{\circ}C$ lower than the concrete block. Therefore, it is analyzed that the water-retentive block with a large amount of evaporation is more effective in reducing the urban heat island phenomenon as compared with the concrete block.

• 건축구조
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• v.10 no.3
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• pp.62-66
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• 2003

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.472-474
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• 2022

본 논문에서는 기존 음악 거래 플랫폼의 문제점을 보완하기 위해 블록체인 기술을 기반으로 한 새로운 음악 거래 플랫폼을 제안한다. 기존 음악 거래 플랫폼은 높은 중개 수수료와 생산자에 대한 불공정한 보수 그리고 불투명한 거래가 이루어진다는 단점이 있다. 이러한 단점을 블록체인 기술의 탈중앙성, 보안성, 투명성, 안전성 등의 특징을 이용하여 보완하고자 한다. 또한, 블록체인 기반 플랫폼 구축을 위해 IPFS, signature file, bloomfilter 등 다양한 기술을 사용한다. 최종적으로 생산자와 소비자 모두가 공정하고 투명한 음악 거래를 할 수 있는 음악 거래 플랫폼을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.694-696
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• 2019

현재 4차 산업 혁명과 가상화폐에 대한 전 세계적인 관심으로 블록체인 시스템이 급부상하고 있다. 현재 구현중심인 국내외 블록체인 시장에서 무수히 많은 블록체인 기반 플랫폼들이 등장과 함께 오류가 발생하고 있다. 하지만 블록체인 시스템의 신뢰성, 확장성, 안정성 등에 대한 검증은 누구도 하고 있지 않다. 이런 문제 해결을 위해 Go language로 구성된 블록체인 코드를 분석할 수 있는 정적분석기를 통한 품질 가시화 방법을 제안한다. 이를 통하여 Blockchain Code의 내부 복잡도를 식별하고자한다. 즉, 코드 내부를 가시화하고 개발자가 보다 쉽게 코드를 유지보수 할 수 있으며 블록체인 시스템의 소프트웨어 공학적인 고품질화가 가능하다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.2
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• pp.420-425
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• 2010

In the process of warm forging, billet is heated up to $800^{\circ}C$ and located in the upper part of die block impression. The scattered oxidized scale may cause workers burn and shortening of die life sticking to the die block impression. The separating materials sprayed in die block cause harmful dust, harmful mist, fume, and bad odor which contaminate workshop environment. The process is classified as one of the avoided jobs and make the planned output achievement difficult. Development of an elimination device to clear out the contaminating materials in the workshop and improvement of the unsatisfactory maintenance method to fix the abrasion of die block impression which delays the dead line, cost increases needs to be developed. In this research, I tried to solve the problems caused in warm forging of bronze pipe joint such as the billet heating process, die maintenance, and manufacturing cost through improvement of warming forging manufacturing method and die maintenance method and eliminating harmful gas which will make the workshop more environment friendly.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.25-28
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• 2021

블록체인은 탈집중화, 위변조 방지, 추적 가능, 노드 간 공동 유지 및 보수가 가능한 데이터베이스로서 서로 신뢰하지 않은 노드 간 통신 신뢰 문제를 해결할 수 있는 점 대 점 통신 네트워크를 실현할 수 있다. 최근 몇 년 동안, 블록체인 기술은 지속적으로 발전하여 데이터 보안 문제를 해결하기 위한 중요한 기술로 주목받고 있다. 블록체인의 응용은 최초의 디지털 화폐 영역에서 금융·정무·공업 제조 영역으로 확대되고 있다. 블록체인의 특성에 따라 블록체인의 성능은 분산형 데이터 통신에 비해 크게 떨어지고 처리량이 제한되는 문제점이 존재한다. 본 논문에서는 최근 연구되고 있는 블록체인의 보안 구조 및 성능 분석에 대해 조사하고, 기존에 연구되었던 기술과 비교하여 블록체인의 안전성을 유지하며 성능을 향상시키는 방법에 대해 고찰한다. 이후 유향 비순환 그래프 (DAG: Directed Acyclic Graph) 및 샤딩 (Sharding)을 이용하여 안전성과 성능을 강화시키는 방법에 대해 제안한다. 제안하는 시스템은 DAG를 사용하여 위변조 방지 및 처리 속도 향상의 이점을 가지고 있으며, 샤딩을 사용함으로써 데이터 처리량을 향상시킨다. 마지막으로 제안하는 시스템은 기존 블록체인과 비교하여 안정성과 데이터 처리량 측면에서 비교 분석을 진행한다.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.287-288
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• 2006

Cracks on the cylinder block of diesel engines will often happen due to cyclic load and thermal stress. According to the Classification Societies' rules, welding repairs of cylinder block made of cast irons are generally not permitted. However, such welding repairs became inevitable taking enormous cost and time for their renewal into consideration. In this study repair welding methods for the cylinder blocks, made of gray cast irons were reviewed and the tests of their welds were carried out in order to purpose the repair welding methods of packing seat and o-ring seat of cylinder block and apply them to the practice. It is concluding remarks that the suspected crack by a magnetic particle test due to different magnetic permeability can be identified, which are not associated with a mechanical discontinuity.

• Journal of the Society of Disaster Information
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• v.13 no.2
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• pp.191-198
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• 2017

Lego block system forms a temporary pavement area using the assembled structure block in the road excavation work for the maintenance and installation of facilities. This system was developed for a safe passage of vehicles and pedestrians. A study on the fundamental performance of a lego block system was performed through material quality, sliding resistance and compression tests. And compaction performance of ground on the road was reviewed and evaluated through field tests. As a result, a lego block system for road recovery showed the excellent performance and compaction effect.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.6
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• pp.165-174
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• 2010

TTG-blocks are concrete blocks designed to be paved around the bridge piers in order to protect the channel bed from local scour. In this study roughness coefficient of T.T.G- blocks are investigated through the hydraulic model test. And critical safety weight of TTG-blocks is derived in terms of Reynolds number for each individual block and group of linked blocks. Flume experiments show that a performance of TTG-blocks is effective to protect the river channel bed from local scour at bridge piers if it is assessed using with geotextile mat under blocks or designated gravels for filling in holes of blocks.