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재개발·재건축 현장의 범죄예방을 위한 CPTED 적용현황과 개선방안
이한솔(Lee, Han-Sol),송영웅(Song, Young-Woong),최윤기(Choi, Yoon-Gi) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.1
The purpose of this study was informed the crime risks that could occur during the migration period during the reconstruction and redevelopment project in Korea and suggested the CPTED solution needed to create a safer residential environment. There are cases in which CPTED have been applied only to the dismantled areas after the long delays of the project, so it is not enough to cope with the problems caused by the progress of the projects. It is also considered that there is a lack of CPTED regulations or guidelines that can be applied during the transitional period but during periods of high probability of crime. In recognition of this problem, we visited the Bongseok 3 - dong, Dongjak - gu, Seoul, which is undergoing migration. Based on the two theories, we propose a CPTED solution.
전기장 과냉각 시스템을 이용한 건조숙성 닭가슴살의 이화학적 특성
김한솔(Han-Sol Kim),이솔희(Sol-Hee Lee),김학연(Hack-Youn Kim) 한국식품영양과학회 2020 한국식품영양과학회지 Vol.49 No.9
본 연구에서는 전기장 과냉각(Electric Field Refrigeration, EFR) 상태와 일반냉장(Commercial Refrigeration, CR) 상태에서 건조숙성 기간에 따른 닭가슴살 숙성육의 이화학적 및 미생물학적 품질특성을 조사하였다. EFR 건조숙성육의 숙성감량과 트리밍감량은 CR 건조숙성육보다 유의적으로 더 낮은 값을 나타내었다(P<0.05). EFR 건조숙성육의 보수력은 3주차부터 유의적으로 증가하였다(P<0.05). EFR과 CR 건조숙성육 모두 숙성 기간이 증가함에 따라 가열감량이 감소하였다(P<0.05). EFR 건조숙성육의 전단력은 숙성 3주차 건조숙성육의 전단력이 0, 1, 2주차 건조숙성육보다 유의적으로 낮은 값을 나타내었다(P<0.05). 숙성 1, 2주차에서 EFR 건조숙성육이 CR 건조숙성육보다 유의적으로 낮은 전단력을 나타내었다(P<0.05). EFR 건조숙성육과 CR건조숙성육의 총균수는 숙성 기간이 증가함에 따라 총균수가 증가하는 경향을 보였으며, EFR 건조숙성육은 CR 건조숙성육보다 지방산패도가 안정적으로 진행되었다. 본 연구결과를 요약하면 EFR 시스템을 적용하여 닭가슴살 건조숙성육 제조 시 이화학적 및 미생물학적 특성이 안정적으로 건조숙성이 진행되며, 3주가 적정 건조숙성 기간이라고 판단된다. This study investigated the physicochemical and microbial characteristics of chicken breast applied with electric field refrigeration (EFR) versus commercial refrigeration (CR). The aging loss and trimming loss of the EFR treatments were significantly higher than those of the CR treatment (P<0.05). The water holding capacity (WHC) of the EFR treatments increased significantly from three weeks (P<0.05). Cooking loss of both EFR and CR treatments decreased significantly with increasing number of dry-aging weeks (P<0.05). The shear force of the EFR treatments was the lowest (P<0.05). The shear force of the EFR treatments was significantly lower than that of CR from one to two weeks (P<0.05). The total plate count of both EFR and CR treatments tended to increase with increasing dry-aging period, thiobarbituric acid reactive substances of the EFR treatments was more stable than that of the CR treatments. The results showed that the application of the EFR system improves the physicochemical and microbial characteristics of chicken breast. Furthermore, chicken breast dry-aging meat was suitable for the dry-aging period until three weeks.
이한솔(Han Sol Lee),윤진영(Jinyoung Youn),조진환(Jin Whan Cho),안종현(Jong Hyeon Ahn),윤지혜(Ji Hye Yoon),나덕렬(Duk L. Na) 한국언어청각임상학회 2020 Communication Sciences and Disorders Vol.25 No.1
배경 및 목적: 파킨슨병(PD)의 운동 장애는 쓰기 수행에서 글자 크기뿐만 아니라 필압과 속도 측면에도 영향을 미칠 수 있다. 본 연구의 목적은 PD의 쓰기 특성을 필압, 크기, 속도를 중심으로 살펴보고자 하였다. 방법: PD 38명과 정상 성인(NA) 25명, 총 63명을 대상으로, 태블릿 PC와 디지털펜을 가지고 필압, 획의 길이, 쓰기 시간을 측정할 수 있는 소프트웨어를 사용하여 점선 따라 그리기와 문장 쓰기 과제를 실시하고, 필압, 글자 크기, 쓰기 속도를 분석하였다. 결과: 점선 따라 그리기 과제에서 필압은 두 집단 간 차이가 없었고, 쓰기 속도는 PD 집단이 NA 집단 보다 느렸다. 문장 쓰기 과제에서 PD 집단이 NA 집단 보다 필압이 저하되고, 글자 크기가 작으며, 쓰기 속도가 느렸다. 두 집단은 공통적으로 글자 크기와 쓰기 속도 간의 정적 상관이 나타났으며, PD 집단은 필압과 쓰기 속도 간의 정적 상관도 나타났다. 논의 및 결론: 본 연구 결과는 PD로 인하여 강도, 크기, 속도 등의 운동 능력을 조절하는 것의 어려움이 쓰기 수행 시 필압, 글자 크기, 쓰기 속도로 반영될 수 있음을 보여준다. 본 연구는 그간 글자 크기에만 초점이 맞추어졌던 PD의 쓰기 특성에서 필압이나 쓰기 속도와 같이 다양한 요소를 측정하는 것이 중요함을 확인하였다는 점에서 의의가 있다. Objectives: Movement disorders in Parkinson’s disease (PD) can affect not only letter size but also pen pressure and writing speed. The purpose of this study was to investigate the characteristics of writing with focus on pressure, size, and speed in PD. Methods: Sixty-three subjects (38 in a PD group and 25 in a normal adult [NA] group) performed tasks involving drawing along dotted lines and sentence writing using a tablet PC, digital pen, and software that could measure pen pressure, stroke length, and duration. Results: In the task involving drawing along a dotted line, the PD group showed significantly slower writing speed compared with the findings in the NA group. Additionally, in the task involving sentence writing, the PD group showed significantly weaker pen pressure, smaller letter size, and slower writing speed compared with the NA group. Moreover, both groups showed a positive correlation between letter size and writing speed, but only the PD group showed a positive correlation between pen pressure and writing speed. Conclusion: Difficulty in motor control of strength, size, speed, etc. owing to PD is reflected in pen pressure, letter size, and writing speed when performing a writing task. Our results show an importance in measuring multiple factors such as pen pressure and writing speed in the characteristics of writing in PD, which has until now, has been focused only on letter size.
전기 방사 공정의 제조 변수를 이용한 TiO<sub>2</sub> 나노섬유의 직경 제어
윤한솔,김보성,김완태,나경한,이정우,양완희,박동철,최원열,Yoon, Han-Sol,Kim, Bo-Sung,Kim, Wan-Tae,Na, Kyeong-Han,Lee, Jung-Woo,Yang, Wan-Hee,Park, Dong-Cheol,Choi, Won-Youl 한국결정성장학회 2021 한국결정성장학회지 Vol.31 No.1
TiO2는 물리적, 화학적 안정성이 높고, 신체에 무해하여 태양전지, 치과용 임플란트 및 광촉매 같은 다양한 분야에서 사용되어 왔다. 비표면적이 큰 TiO2 나노섬유는 생체 친화성 제품에서 좋은 반응성과 공기 및 수질 정화시 우수한 광촉매 특성을 보여주었다. TiO2 나노섬유를 제조하기 위해 전기방사법을 사용하였으며, 제조 변수에 따른 직경 변화를 관찰하기 위해 precursor 성분 변수와 공정 변수로 구분하여 미세구조 변화를 분석하였다. Precursor 성분 변수로는 PVP(Polyvinylpyrrolidone) 및 TTIP(Titanium(IV) isopropoxide)의 농도를 선택하였고, 공정 변수로는 주입 속도와 인가 전압을 선택하였다. TiO2 나노섬유의 미세구조와 결정구조는 FE-SEM(Field emission scanning electron microscope)와 XRD(X-ray diffraction)을 이용하여 분석하였다. 450℃에서 3시간 열처리 공정을 통해, 평균 직경 약 0.27 ㎛에서 1.31 ㎛를 갖는 asspun TiO2 나노섬유가 0.22 ㎛에서부터 0.78 ㎛의 평균 직경을 갖는 anatase 상의 TiO2 나노섬유로 상전이 됨을 확인할 수 있었다. 평균 직경 0.22 ㎛의 anatase TiO2 나노섬유는 비 표면적 증대에 의한 광촉매 특성 향상을 기대할 수 있다. 또한 TiO2 나노섬유의 직경 변화를 위해서는 주입 속도 및 인가 전압과 같은 공정 변수보다는 PVP 농도 및 TTIP 농도와 같은 precursor 성분 변수를 제어하는 것이 더욱 효과적이었다. TiO2 has been used in various fields such as solar cells, dental implants, and photocatalysis, because it has high physical and chemical stability and is harmless to the body. TiO2 nanofibers which have a large specific surface area also show a good reactivity in bio-friendly products and excellent photocatalysis in air and water purification. To fabricate TiO2 nanofibers, an electrospinning method was used. To observe the diameter of TiO2 nanofibers with fabrication variables, the fabrication variables was divided into precursor composition variables and process variables and microstructure was analyzed. The concentrations of PVP (Polyvinylpyrrolidone) and TTIP (Titanium(IV) isopropoxide) were selected as precursor composition variables, and inflow velocity and voltage were also selected as process variables. Microstructure and crystal structure of TiO2 nanofibers were analyzed using FE-SEM (Field emission scanning electron microscope) and XRD (X-ray diffraction), respectively. As-spun TiO2 nanofibers with an average diameter of about 0.27 ㎛ to 1.31 ㎛ were transformed to anatase TiO2 nanofibers with an average diameter of about 0.22 ㎛ to 0.78 ㎛ after heat treatment of 3 hours at 450℃. Anatase TiO2 nanofibers with an average diameter of 0.22 ㎛ can be expected to improve the photocatalytic properties by increasing the specific surface area. To change the average diameter of TiO2 nanofibers, the control of precursor composition variables such as concentrations of PVP and TTIP is more efficient than the control of electrospinning process variables such as inflow velocity and voltage.
이한솔(Lee, Han-Sol),이행우(Lee, Heang-Woo),박창영(Park, Chang-Young),김영일(Kim, Young-Il),박채환(Park, Chae-Hwan),장향인(Jang, Hyang-In) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.3
Increasing use of lighting energy has become a social issue that needs to be urgently resolved and, as a solution to this problem, light duct is being actively researched as a natural lighting system. However, light diffuser has not been studied as thoroughly as light collector and light transmitter, despite being an important part of daylight ducts as it directly concerns light environemnt and comfort of occupants. This study proposed a double reflective light diffuser (Case 2) and demonstrated its performance by comparing its lighting performance with that of conventional light diffuser (Case 1) by using light environment analysis system Radiance. The results were as follows: 1) the average indoor illumination of Case 2 was higher than that of Case 1 and this was caused by light diffuser by double reflection in Case 2; 2) uniformity ratio of illuminance of Case 2, in comparison to Case 1, was improved by 77.4%, 74.1%, and 70.0% in summer, middle season, and winter, respectively; 3) daylight factor of Case 2, in comparison to Case 1, was improved by 74.4%, 76.9%, and 81.0% in summer, middle season, and winter, respectively, proving effectiveness of Case 2 proposed by this study.