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최지수 ( Choi Ji-su ),김상엽 ( Kim Sang-yeop ),송진희 ( Song Jin-hee ),조홍범 ( Cho Hong-beom ),이규냠 ( Rhee Kyu-nam ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In winter, low outdoor temperature can casue reduction of concrete strength. Therefore, thermal protection is required when curing concrete in winter to maintain a certain level or higher surface temperature. Accordingly, in domestic construction sites, a curing method in which surrounds casting areas by tents and operates hot air blowers are widely applied. However, local low-temperature areas may occur due to airtightness of the curing tents. If additional heat is supplied to prevent occurrence of local low-temperature areas, energy consumption increases. Therefore in this study, a plan for improvement method of concrete curing was considered and the performance was evaluated through numerical analysis. A plan to improve the airtightness of the wall opening was applied, but the analysis showed that if only a part of the curing area is shielded, the temperature of the unshielded area decreases, making it inappropriate to improve curing performance.
최지수(Choi, Ji-Su),김정기(Kim, Chung-ki) 한국실내디자인학회 2014 한국실내디자인학회 학술대회논문집 Vol.2014 No.5
Even with the rapid changes in the global economy, "Jewelry" was able to reach 170 billion dollars in its trade volume and allowed itself to become a major part of the economy. In korea, the modern jewelry industry has managed to form a large market in a short period of time, however, the market was disadvantaged as it wasn"t able secure its position at an industrial state. Also, it appears that ever since the FTA was signed, jewelry makers who went to overseas are bringing an "u-turn" phenomenon- returning back to Korea. Thus, in order to optimally activate jewelery industry in korea and settle these "U-turn" companies / (jewelery makers) in korea, Jewelry PR(Public Relation) room will be planned to best fit its purpose. as for my design directions, I have thoroughly looked through the characteristics of the jewelry industry and was able to draw its competitive factors by analysing the current industry status of the jewelery industry and support policies of foreign countries. And these competitive factors were : exchanges between industrial clusters, professional training affordability, culture-artistry, customer participate and reliability. PR(Public Relation) room plan that is focused on the specific characteristics of Jewelry industrial competitiveness will solidify its presence in the domestic jewelry industry and is a way to boost the competitiveness in the world market.
CFRP 파이프의 와인딩 적층 패턴 설계 및 HNT 나노입자 보강에 따른 수 환경에서의 기계적 물성 평가
최지수 ( Ji-su Choi ),박수정 ( Soo-jeong Park ),김윤해 ( Yun-hae Kim ) 한국복합재료학회 2021 Composites research Vol.34 No.3
유체 이송에 사용되는 강재 파이프는 신설과 도장, 또는 부식과 노후화로 인한 제반 시설 보수에 거대한 규모의 시간과 비용이 요구된다. 이에 본 연구에서는 강재 파이프의 대체재로, 내부식성과 내화학성이 우수한 탄소섬유강화복합재료(Carbon Fiber Reinforced Plastic, CFRP) 파이프 구조의 최적화 설계를 수행하였다. 헬리컬 패턴 표면에 후프 패턴을 혼합적층하여 내구성을 향상시켰으며, 수분 환경에서의 에폭시 흡습 현상을 억제하기 위해, 할로이사이트 나노튜브(Halloysite Nanotube, HNT)를 첨가하였다. HNT/CFRP 파이프는 필라멘트 와인딩 공정으로 제작하였으며, 기계적 물성 시험과 70°C 고온 증류수 환경하에서 흡습 시험을 진행하였다. 그 결과, 파이프 두께의 0.6%에 해당하는 후프 패턴의 적층 시, 가장 우수한 물성을 나타냈다. 또한 0.5 wt.% HNT 첨가 시 상대적으로 높은 내흡습성을 가졌으며, 층간 계면에서의 박리 현상이 지연되어 가장 낮은 강도 저하율을 보였다. Currently, fluid transfer steel pipes take a lot of time and expense to maintain all facilities due to new construction and painting or corrosion and aging. Therefore, this study was conducted for designing a CFRP pipe structure with high corrosion resistance and chemical resistance as a substitute for steel pipes. The helical/hoop pattern was cross-laminated to improve durability, and HNT was added to suppress the moisture absorption phenomenon of the epoxy. The HNT/CFRP pipe was manufactured by a filament winding process, and performed a mechanical property test, and a moisture absorption test in distilled water at 70°C. As a result, the highest bending strength was obtained when the hoop pattern was laminated with a thickness equivalent to 0.6% of the pipe. The 0.5 wt% HNT specimen had the highest moisture absorption resistance. Also, the delamination phenomenon at the interlayer interface was delayed, resulting in the lowest strength reduction rate.
유아의 글 없는 그림책 읽기 반응과 이야기 이해: 또래와의 협동과 경쟁 읽기 비교
최지수(Ji-Su Choi ),최나야(Na-Ya Choi) 한국아동학회 2020 아동학회지 Vol.41 No.5
Objectives: The purpose of this study was to find out whether four-year-old children differ in their reading responses and story comprehension when reading wordless picture books with their peers in different peer interaction conditions. Methods: The children (N = 115) were from two daycare centers and four kindergartens located in Seoul, Gyeonggi, and Incheon. Each childs personal characteristics were controlled by random assignment. After the children had read the picture book assigned for cooperative, competitive and reading alone conditions, their story comprehension was measured. Results: The number of words spoken was greater in the cooperative and competitive conditions than in the reading alone condition. Exploratory, interpretive, constructive and play behaviors were more frequent in the cooperative condition. However negative behavior was more frequent in the competition condition. Story comprehension was higher when children read picture books in cooperation with their peers. Conclusion: The context in which picture books were read was found to affect not only reading responses, but also the story comprehension.
천장복사냉방패널 적용 공간의 기류순환에 따른 냉방용량 및 실내환경 평가
최지수(Ji-Su Choi),이규남(Kyu-Nam Rhee),정근주(Gun-Joo Jung) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
본 연구의 목적은 개방형 천장복사냉방패널의 기류순환에 따른 냉방용량 증대 효과를 평가하는 것으로, 천장복사냉방패널(CRCP)이 적용된 Test-bed에서의 측정값을 통해 CFD 시뮬레이션 모델을 검증하고 다양한 기류순환 조건에서의 냉방용량을 분석하였다. CRCP 사이 개구부의 유무와 기류순환속도에 따른 6가지 Case에 대하여 냉방용량 및 실내환경을 비교한 결과, 개구부를 통한 자연대류 및 기류확산장치를 통한 강제대류를 활용할 경우 냉방용량을 최대 25%까지 증대시킬 수 있으며, CRCP 하부보다 상부에 기류를 순환시킬 경우 냉방효과를 개선시킬 수 있는 것으로 분석되었다. 향후 실제 Test-bed에서의 비교 검증 실험을 통해 해석 모델의 신뢰도를 개선하는 한편, 전력 소비량을 측정을 통해 기류순환 시 CRCP 시스템의 에너지 절감 효과를 분석할 예정이다.
열풍기를 이용한 콘크리트 급열 보양 시 양생가옥 내 온도 분포 개선 방안
최지수(Choi, Ji-Su),김상엽(Kim, Sang-Yeop),송진희(Song, Jin-Hee),조홍범(Cho, Hong-Beom),이규남(Rhee, Kyu-Nam) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.1
In winter, low outdoor temperature can casue reduction of concrete strength. Therefore, thermal protection is required when curing concrete in winter to maintain a certain level or higher surface temperature. Accordingly, in domestic construction sites, a curing method in which surrounds casting areas by tents and operates hot air blowers are widely applied. However, local low-temperature areas may occur due to airtightness of the curing tents. If additional heat is supplied to prevent occurrence of local low-temperature areas, energy consumption increases. Therefore in this study, a plan for improvement method of concrete curing was considered and the performance was evaluated through numerical analysis. A plan to improve the airtightness of the wall opening was applied, but the analysis showed that if only a part of the curing area is shielded, the temperature of the unshielded area decreases,making it inappropriate to improve curing performance.
DCT 영역에서의 반복적인 CRT 기반의 영상 워터마킹
최지수(Ji-Su Choi),김계영(Gye-Young Kim) 한국컴퓨터정보학회 2019 韓國컴퓨터情報學會論文誌 Vol.24 No.2
Digital image watermarking techniques have been studied in various fields in order to protect the copyright of multimedia contents mostly composed by images. JPEG compression is a representative copyright attack for image watermarking. The CRT-based watermarking methods in DCT domain have been studied, because these are robust for JPEG compression attack. In this paper, we propose a new method with improved performance compared with the existing CRT based methods in DCT domain. The proposed method selects the DCT block according to the denseness at the watermark insertion phase, and iteratively adjust the CRT Conditional coefficients at the watermark extraction. This paper shows that it is more robust for the JPEG compression attacks through experimental results.
최지수(Ji-Su Choi),이현석(Hyeon-Seok Lee),박규식(Kyu-Sik Park) 대한전자공학회 2018 전자공학회논문지 Vol.55 No.7
본 논문에서는 정사면체 마이크로폰 어레이를 이용한 새로운 음원 추적 알고리즘을 제시하였다. 제안 알고리즘은 기존 정삼각형 형태 마이크로폰 음원 추적 시스템에 1개의 마이크로폰을 추가하여 정사면체 형태의 마이크로폰 어레이를 구성하고 수학적인 좌표 변환을 통해 주변 잡음에 좀 더 강인한 시스템을 구축하였다. 실시간 비교 실험결과 기존 시스템에 비해 약 5% 이상의 성능향상과 더불어 대부분의 고도각과 방위각 음원 위치에 대해 안정적으로 동작함을 확인할 수 있었다. This paper proposes a new sound localization algorithm, using tetrahedral microphone array. A proposed system is formed by adding one microphone to the previously known triangular-shaped system and it allows to construct more robust sound localization system with coordinate transform. From the real-time sound localization experiment, the proposed algorithm is superior to the comparison algorithm by more than 5% in sound source detection. In addition, the algorithm shows reliable system performance for every bearing and altitude direction of sound source.
최지수(Ji Su Choi),김영현(Yeong Hyeon Kim),나준호(Jun Ho Na),윤형도(Hyeong Do Yun),이규남(Kyu Nam Rhee),정근주(Gun Ju Jung) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.4
Energy-saving design standards regulates heat transmission coefficient to minimum insulation performance, thus standard model of junction is given. However, enclosed standard model only exist as orthogonal shape. In this context, thermal simulation was performed with THERM to analyze and measure thermal action between orthogonal and non-orthogonal shaped junction. Simulation results revealed certain tendency of thermal influence in angular join of walls. To generalize experiment result about thermal tendency of angular junction, further studies are suggested.