• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2103-2105
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• 2003

본 논문에서는 주변의 잡음에 의해 통신 환경이 나쁜 시스템에서 통신의 안정성과 고속성과 원거리 통신의 구현을 중점으로 연구하였다. 전동차와 같이 Serial Communication을 이용해 차량사이 통신을 하는 경우 주변의 고전압, 고전류의 잡음에 의해 통신 Packet이 파손될 수 있으며 심지어 통신 모듈이 파괴되는 현상도 발생한다. 이를 위해 펄스트랜스 포머를 사용해 Hardware의 보호 뿐아니라 고속의 안정적인 통신을 구현 할 수 있다. 이는 펄스트랜스 포머의 특성상 하드웨어적으로 분리된 통신선과 통신모듈로 인한 안전성과 원거리 통신을 실현 하였으며 동기통신을 통한 빠른 속도와 FM0, FM1, Manchester 부호 방식에 의한 빠르고 안정한 통신을 제공하기 때문이다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.06a
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• pp.238-239
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• 2006

본 논문은 게이트 절연막에 OTS(n-octadecy trichlorosilance) 혼합용액을 이용하여 SAMs(Self-Assembled Monolayers)막을 형성하였다. OTS 혼합용액은 OTS를 0.1w%와 0.5w% 각각을 클로로포름 30w%와 헥산 70w%에 혼합하여 만들었다. 이 혼합용액을 게이트 절연막위에 표면처리하였다. 활성층인 Pentacene이 게이트 절연막 위에 증착될 때, OTS 혼합용액의 비에 따라 누설전류특성을 보았다. OTS를 0.1w% 처리한것이 0.5w%보다 누설전류가 더 작게 나타났다. 결과적으로 OTFT의 게이트 절연막의 절열특성은 향상시키는데 OTS 혼합용액의 비가 큰 영향을 준다.

• Journal of the Korean Professional Engineers Association
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• v.16 no.1
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• pp.20-34
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• 1983

A phenomenon in the unplanned urban sprawl of Cheong-ju city has to be rest-rained from disposing and to develop, though progress in urbanization inevitably decreases rural area. So, this thesis aims at reviewing, revising and guiding toward the more effective land use planning practice and zoning mechanism and system of Cheong-ju city. I proposed that land use planning should be had several factors and thereupon that Korean zoning mechanism and system including Building Code should be amended because of inducing human activities in buildings and facilities not to demarcate and plan every one of them. First, the factors of urban planning are a rather diversified approach to it than a unified, supplementation of the applicable difference in time between preparing and appling it, a solid controlling system, a micro and macro planning theory and giving serious consideration for the inertia from the existing land use. Second, the applicable amendments for our zoning mechanism including Eluding Code are as follows; a need of reorganization for Zoning Ordinance appricated to different regulation concerning a scale and peculiarity of a oily, a decision of the different earmarked confinement in area to different zone ana from Zoning Ordinance in City Planning Law, a demarcated facilities and the more detailed land use concerning human activies than the exsisting and entrusting decision on the ways and processes of it to every rural city planning committee, a settlement of zone ana area considering for block-unit and Planned Unit Development(P. U. D.), and a need of security jurisprudence in order to solve the zoning regulation rather in City Planning Law than in Building Code that our zoning regulation and controlling system are depended on. According to these applicable amendments to Cheong-ju city, I proposed the conceptions of Cheong-ju city land use planning are as follows; a reinforcement with one cored pattern of urban land use, a selection of gradual urban sprawl by way of city development and renewal, a strengthening accessibility to the core of the city with Plurizing the system of arterial roads, a choice of priority to conservation at the core of tile city and security of open spaces and parking area at the area of the city, a harmonization between development and conservation at the inner ring area that is situated between the core and periphery reserved area in order to develop in the future, a buffered open space situated at the congested area with heterogenous functions, and a completion of urban open space system. The proposal made here so far is for the hope of the better structure of Cheong-ju city that should be granted to the peculiarity developed with educational, cultural, conservative and self-sufficient city functions.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.1897-1898
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• 2006

과거에는 하나의 제어시스템을 구축하기 위해서는 여러 개의 주변소자를 접목시켜서 구현해 왔다. 하지만 근래에 들어서 소형화, 간략화를 통해 계속해서 원 칩 마이크로프로세서의 사용이 늘고 있는 실정이다. 본 논문에서는 고성능의 원 칩 마이크로프로세서 및 Digital Signal Processor인 TMS320F2812를 이용하여 구동회로를 간략화 하여 3상모터 구동시스템을 구성하고 PI제어 알고리즘을 이용하여 3상 유도전동기의 속도제어 시스템을 구현하였다.

• Magazine of RCR
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• v.5 no.2
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• pp.21-27
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• 2010

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.1033-1036
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• 2010

본 연구는 한국 의료관광의 국제 경쟁력 향상을 위한 전략으로 한식의 도입가능성을 알아보고 이를 활용할 수 있는 방안을 제시하기 위한 목적으로 연구되었다. 연구 결과 한식은 의료관광에 있어서 잠재적 가능성이 높은 자원으로 활용이 가능하며, 이를 위한 전략으로 약선음식과 같은 전통음식을 차용한 의료관광상품의 개발, 한국 의료관광에 한식의 이미지 도입을 통한 차별화 전략을 제시하였다.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2008.11a
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• pp.125-130
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• 2008

The new apartments has been rapidly built through the outskirts of Cheong-ju city since the latter half of 1980's. So, the population decreased in Seong-an dong and Jung-ang dong which are located in traditional urban area of Cheong-ju. Also, residential areas became obsolete and residential buildings happened to be vacant and empty. For urban rehabilitation, the city authorities will construct the high-rise complex housings with stores in the traditional urban area. We have doubts about whether the rapid change of new housing construction is right or not. Therefore, It is necessary to give a correct diagnosis of the present state from urban atrophy, keeping this area sustainable with traditionality and locality. This study is to examine and analysis in detail distribution patterns and habitable floor area by house types in Seong-an dong and Jung-ang dong which are located in traditional urban area of Cheong-ju. The result are as follows; the residential buildings as the 2,680 houses(including detached and apartment houses) and the 804 shop houses are distributed with 3,484(67%) of the whole 5,183 buildings and form 28percent of the whole floor areas. A distribution and area ratio of houses to shop houses is irrespectively about 76 : 24percent. The average floor area is represented with $66m^2$/household and $28.5m^2$/person. It shows that a hollowing out of urban area has caused the surplus of residential buildings and floor areas.

• Journal of the Korea Institute of Building Construction
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• v.21 no.6
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• pp.551-562
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• 2021

In this study, to suggest an efficient method of using coal gasification slag(CGS), a byproduct from integrated gasification combined cycle(IGCC), as a combined fine aggregate for concrete mixture, the diverse performances of concrete mixtures with combined fine aggregates of CGS, river sand, and crushed sand were evaluated. Additionally, using CGS, the reduction of the hydration heat and the strength developing performance were analyzed to provide a method for reducing the heat of hydration of mass concrete by using combined fine aggregate with CGS and replacing fly ash with cement. The results of the study can be summarized as follows: as a method of recycling CGS from IGCC as concrete fine aggregate, a combination of CGS with crushed sand offers advantages for the concrete mixture. Additionally, when the CGS combined aggregate is used with low-heat-mix designed concrete with fly ash, it has the synergistic effect of reducing the hydration heat of mass concrete compared to the low-heat-designed concrete mixture currently in wide use.

• Journal of the Korea Institute of Building Construction
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• v.23 no.6
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• pp.673-682
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• 2023

This study investigates the delay in setting characteristics of mortar influenced by variations in super retarding agent(SRA) content, curing temperature, and strength levels. Utilizing a settimeter, the research introduces an objective approach to accurately determine the setting time of concrete with SRA under diverse environmental and material mixing conditions at construction sites. The findings indicate that the settimeter, in conjunction with a nonlinear regression model, can effectively estimate the setting time of super retarding mortar. Optimal management of the initial setting is recommended at approximately 45ST and the final setting around 80ST. This methodology enables more effective quality control in the setting times of super retarding concrete.

• Journal of the Korea Institute of Building Construction
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• v.24 no.3
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• pp.297-308
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• 2024

This study presents a novel approach for evaluating fire-induced damage depth in concrete. The methodology leverages the principle that exposure to high temperatures causes internal expansion within concrete, leading to increased voids and microcracks in the damaged zones. This heightened porosity results in greater absorption rates compared to undamaged areas. By immersing fire-damaged concrete samples in water and subsequently monitoring the drying process, the depth of damage can be assessed. Differences in drying rates and color variations between damaged and undamaged areas serve as visual indicators for determining the extent of the damage. Experimental results from this water immersion method revealed damage depths of 38.7mm and 37.5mm for two different concrete mixtures. These measurements notably surpass the damage depths estimated using traditional phenolphthalein-based methods. This discrepancy suggests that utilizing the absorption rate principle, which is directly linked to the physical changes caused by thermal expansion, offers a more accurate and sensitive assessment of fire damage depth compared to methods relying solely on the presence of Portlandite for colorimetric indication.