• 한국산학기술학회논문지
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• 제11권2호
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• pp.628-633
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• 2010

1910년대 주거담론은 위생론 일반을 다루는 글, 여성의 주택청결 관리를 계몽하는 글 그리고 일본인이 한국전통주택을 관찰하고 평가하는 글에서 등장한다. 1900년대의 그것과 비교하면 위생에 초점을 두는 점은 같지만 깊이와 양에서 매우 위축되어 있다. 담론의 주체와 맥락도 달라졌다. 1900년대 주거담론은 위생을 국가의 문명화와 부국강병을 위한 방법론으로 인식한 개화론자들이 주도했고 국가의 공중위생 책무를 강조하는 담론과 함께 전개되었다면, 1910년대는 여름철이나 환절기 전염병을 예방 차원에서 개인위생을 계몽하는 의사나 의료관료들을 통해 주로 개진되었다. 1910년대 조선총독부의 환경위생사업에서 식민지 조선인의 거주지와 주택은 제외되어 불결했고, 공중위생정책에서 차별받는 그들에게 주거의 청결은 개인의 책임지고 해결해야 할 문제였다. 주택의 불결은 민족적 미개함 열등함의 표상이 되었고 식민지지배의 당위성을 공고히 하는 효과를 낳았다. 또한 1920년대 주거개량 문제가 조선인의 인종적 개량과 문명화의 과제로서 논의되는 데 심리적 배경이 되었다.

• Advances in aircraft and spacecraft science
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• 제2권2호
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• pp.169-182
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• 2015

Aeronautics engine cooling is one of the biggest problems that engineers have tried to solve since the beginning of human flight. Systems like radiators should solve this purpose and they have been studied extensively and various solutions have been found to aid the heat dissipation in the engine zone. Special interest has been given to air coolers in order to guide the air flow on engine and lower the high temperatures achieved by the engine in flow conditions. The aircraft companies need faster and faster tools to design their solutions so the development of tools that allow to quickly assess the effectiveness of an cooling system is appreciated. This paper tries to develop a methodology capable of providing such support to companies by means of some application examples. In this work the development of a new methodology for the analysis and the design of oil cooling systems for aerospace applications is presented. The aim is to speed up the simulation of the oil cooling devices in different operative conditions in order to establish the effectiveness and the critical aspects of these devices. Steady turbulent flow simulations are carried out considering the air as ideal-gas with a constant-averaged specific heat. The heat exchanger is simulated using porous media models. The numerical model is first tested on Piaggio P180 considering the pressure losses and temperature increases within the heat exchanger in the several operative data available for this device. In particular, thermal power transferred to cooling air is assumed equal to that nominal of real heat exchanger and the pressure losses are reproduced setting the viscous and internal resistance coefficients of the porous media numerical model. To account for turbulence, the k-${\omega}$ SST model is considered with Low- Re correction enabled. Some applications are then shown for this methodology while final results are shown in terms of pressure, temperature contours and streamlines.

• Asian Pacific Journal of Cancer Prevention
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• 제16권17호
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• pp.7409-7414
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• 2015

Loop-mediated isothermal amplification (LAMP) developed by Notomi et al. (2000) has made it possible to amplify DNA with high specificity, efficiency and rapidity under isothermal conditions. The ultimate products of LAMP are stem-loop structures with several inverted repeats of the target sequence and cauliflower-like patterns with multiple loops shaped by annealing between every other inverted repeats of the amplified target in the similar strand. Because the amplification process in LAMP is achieved by using four to six distinct primers, it is expected to amplify the target region with high selectivity. However, evaluation of reaction accuracy or quantitative inspection make it necessary to append other procedures to scrutinize the amplified products. Hitherto, various techniques such as turbidity assessment in the reaction vessel, post-reaction agarose gel electrophoresis, use of intercalating fluorescent dyes, real-time turbidimetry, addition of cationic polymers to the reaction mixture, polyacrylamide gel-based microchambers, lateral flow dipsticks, fluorescence resonance energy transfer (FRET), enzyme-linked immunosorbent assays and nanoparticle-based colorimetric tests have been utilized for this purpose. In this paper, we reviewed the best-known techniques for evaluation of LAMP amplicons and their applications in molecular biology beside their advantages and deficiencies. Regarding the properties of each technique, the development of innovative prompt, cost-effective and precise molecular detection methods for application in the broad field of cancer research may be feasible.

• Journal of Biosystems Engineering
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• 제40권1호
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• pp.10-18
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• 2015

Purpose: The study was conducted to investigate the proper working conditions like the mesh size of the concave and the chaffer angle of the oscillating sieve, and the fan speed of the head-feeding rice combine for foxtail millet harvesting. Methods: The study aimed to determine the harvesting conditions for the rice combine harvester at a 0.5 m/s working speed and at $40^{\circ}$ and $55^{\circ}$ sieve chaffer angles. The harvesting loss of the foxtail millet based on the speed of the fan and the oscillating speed of the sieve was measured at three levels of fan speed and oscillating sieve speed. Results: The threshing rates of different foxtail millet varieties were 64.1~83.5% at a mesh size of 7 mm of the concave. In experimental foxtail millet harvesting, the optimal operating condition of the rice combine harvester included a $40^{\circ}$ sieve chaffer angle and a 4.8 Hz oscillating sieve (cleaning shoe) frequency. The grain loss was found to be lower at a $40^{\circ}$ than at a $55^{\circ}$ sieve chaffer angle. In field harvesting using the combine harvester, the lowest harvesting grain loss rate of the foxtail millet varieties ranged between 0.2~0.5% at a 7 mm mesh concave, $40^{\circ}$ chaffer angle, 4.8 Hz sieve frequency, and a 20 m/s fan speed at an engine speed of 2,000 revolutions per minute (RPM). Conclusions: Findings showed that foxtail millet could be harvested using the combine harvester.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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• pp.172-178
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• 2017

열적 특성은 에너지 물질 분야에서 중요한 특성 중 하나로, 에너지 물질 분해 시 분해열을 방출하기 때문에 DSC(시차 주사 열량계, Differential Scanning Calorimetry)를 자주 사용하고 있다. 승온속도를 달리한 DSC 측정의 경우, 용융과 같은 열역학적 변화로 인해 물질의 열적 측정에 방해를 준다. 또한 kg 단위로 예측하기 때문에 mg 단위 때와는 다른 공간상의 열 변화의 변수가 생긴다. 이번 연구에서는 이 문제점을 해결하는 방안으로, 등온 조건으로 한 DSC(Differential Scanning Calorimetry) 기초 데이터로 ATKS thermokinetic 프로그램을 이용하여 열적 노화 특성을 예측한다. 그리고 g 단위로 측정하는 ARC(Accelerating Rate Calorimetry)의 데이터를 이용하여 열적 노화 특성을 예측하고 결과를 비교 할 것이다.

• 한국농촌건축학회논문집
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• 제18권3호
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• pp.17-24
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• 2016

The aim of this study is to build an architectural landscaping design ways of vulnerable community in rural area. I surveyed scenery structures, public buildings and single home forms, and fence types of house in twelve villages which have undertaken improving environment of rural community in four provinces. They all have an inferior surroundings to live in rural village, because they were isolated from the city, located on the mountain or island, and made a living under the slate materials of roof. The central government has been driving to reform the conditions with local office, so that they may increase their living qualities and village environment to get to the general level of rural area. There are three results of this study as follows: First, the scenery of the village surveyed has a remarkable views of locality and hierarchy of layers between field and mountain, which is very identified as a typical image of Korean rural topology. Second, the public buildings and single homes and outside wall of houses were personally designed or reformed as a various types like a flat slab style and different architectural structure, because they followed only to keep the architectural code rather than to make a harmony with other traditional style buildings. When they have to remodel it again through SaethulMaul project, they are needed to consider of both architectural code and design guideline for the local landscape design image. Third, to make a different landscape view of each village and improve housing conditions, it should be taken a people participation design way.

• Steel and Composite Structures
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• 제39권5호
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• pp.615-630
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• 2021

The main purpose of the present work was to study the dynamic instability of a three-layered, thick composite sandwich beam with the functionally graded (FG) flexible core subjected to an axial compressive follower force. Flutter instability of a sandwich cantilever beam was analyzed using the high-order theory of sandwich beams, for the first time. The governing equations in general for sandwich beams with an FG core were extracted and could be used for all types of sandwich beams with any types of face sheets and cores. A polynomial function is considered for the vertical distribution of the displacement field in the core layer along the thickness, based on the results of the first Frosting's higher order model. The governing partial differential equations and the equations of boundary conditions of the dynamic system are derived using Hamilton's principle. By applying the boundary conditions and numerical solution methods of squares quadrature, the beam flutter phenomenon is studied. In addition, the effects of different geometrical and material parameters on the flutter threshold were investigated. The results showed that the responses of the dynamic instability of the system were influenced by the follower force, the coefficients of FGs and the geometrical parameters like the core thickness. Comparison of the present results with the published results in the literature for the special case confirmed the accuracy of the proposed theory. The results showed that the follower force of the flutter phenomenon threshold for long beams tends to the corresponding results in the Timoshenko beam.

• 한국정보기술학회논문지
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• 제17권5호
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• pp.129-136
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• 2019

센서 등 많은 IoT 디바이스들은 화면출력 및 입력장치 등이 결여된 경우가 많아 개인정보보호법이나 GDPR 등에서 요구하는 개인정보수집 동의 절차를 만족시키기 어려워, 해당 비즈니스 분야 발전에 법적인 걸림돌로 작용하고 있다. 본 연구에서는 법적인 요건을 만족하는 IoT 시스템에서의 개인정보수집 동의 절차를 설계한다. 설계된 방식에서는 먼저 사용자의 개인정보가 암호화된 상태로 수집되며, 이후 데이터 수집 서버와 사용자 에이전트 사이에 개인정보 수집을 기반으로 연관을 맺음으로서 암호화된 내용을 복호화 한다. 이러한 연관 동의 과정에서 사용자 에이전트는 데이터 수집 서버의 개인정보수집 약관 등을 이해하고 복호화키를 제공한다. IoT 시스템에서의 이러한 방식의 개인정보수집 동의 절차는 GDPR 등의 법령에서 정하는 투명성, 자율성 등의 요건을 만족함으로서 개인정보를 취급하는 IoT 비지니스 분야의 발전에 크게 기여할 것으로 판단된다.

• 한국전자통신학회논문지
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• 제17권5호
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• pp.815-824
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• 2022

해상풍력발전과 같은 간헐성 재생에너지원의 급격한 성장은 바다를 횡단하는 장거리의 전기에너지의 변환 필요성을 증가시키고 있다. 넓고 깊은 바다에 걸쳐서 장거리 대용량 전력송전을 위한 해법중의 하나는 HVDC 해저 전력케이블을 사용하는 것이다. 그러나 교류자계가 없는 직류전력 케이블의 다양한 해양조건을 갖는 연속허용전류와 관련한 표준이나 연구가 없다. 본 연구에서는 대표적인 두 종류의 해저케이블 모델과 남해안과 서해안 두 지역의 해양 요건을 가정하여 직류케이블의 연속허용전류를 모의하였다. 모의 결과를 보면 직류케이블의 연속허용전류는 해저 지반 깊이에 기반한 감소 구배 특성을 갖고 있는 것을 확인하였다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.314-324
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• 1996

A high speed NMR quality evaluation sensor was designed , constructed and tested . The device consists of an NMR spectrometer coupled to a conveyor system. The conveyor was run at speeds ranging from 0 to 250 mm/s. Spectral of avocado fruits and one-dimensional magnetic resonance images of pickled olives were acquired while the samples were moving on a conveyor belt mounted through a 20Tesla NMR magnet with a 20 mm diameter surface coil and a 150 mm diameter imaging coil respectively. Fro a magnetic resonance spectrum analysis, motion through variations in the magnetic field tends to narrow spectral line width just like using sample rotation in high resolution NMR to narrow spectral line width. Spectrum analysis was used to detect the dry weight of avocado fruits using the ratio oil and water resonance peaks. Good correlations maximum r=0.970@ 50 mm/s and minimum r=0.894@250mm/s ) between oil and water resonance peak ratio and dry weight of avocados were observed at speeds ra ging from0 to 250mm/s. For the application of magnetic resonance imaging (MRI) method, the projections were used to distinguish between pitted and non-pitted olives . Effect of fruit position in the coil was tested and coil degree effects were noticed when projects were generated under dynamic conditions. Various belt speeds (up to 250mm/s) were tested and detection results were compared to static measurements. Higher classification errors were occurred at dynamic conditions compared to errors while olives were at rest.