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The aim of this study was to provide the quality index of salted Korean cabbage in a short-term distribution system. Salted Korean cabbages were packaged with or without 2% salt water, and then distributed in a conventional system (CVS) and a cold-chain system (CCS) for 6 h. The material temperature of samples with and without salt water gradually increased to 19.57℃ and 19.43℃ in a CVS, respectively and to 10.73℃ and 12.90℃ in a CCS, respectively. Salinity of the materials in a CCS did not change, whereas salinities of the materials in a CVS were 1.2 and 1.7 fold higher, respectively. Also, a slight increase in acidity was observed in both packaging materials in a CCS. In the case of a CVS, total aerobic bacteria and lactic acid bacteria increased to 7.62 log CFU/g and 6.77 log CFU/g in the materials with salt water, respectively, whereas the number of total aerobic bacteria and lactic acid bacteria ranged between 5.62-5.85 log CFU/g and 4.33-4.83 log CFU/g in the materials without salt water, respectively. However, significant microbial changes were not observed in a CCS as distribution time increased. CCS with salt water packaging was effective in achieving microbial control and maintaining physicochemical quality. Salinity, aerobic bacteria, and lactic acid bacteria can be useful as quality indices for a CVS, and acidity can be useful as quality index for a CCS.
This study aims to observe the wind load characteristics around two-dimensional rotor blade of small wind turbine under high wind speed. The CFD analysis on the blade shape of NACA-4418 is performed to understand the wind load(i.e., drag and lift coefficient). In the results, the drag and lift coefficient were estimated to be 0.013, 0.44, respectively, at the wind speed 35m/s(wind speed at the height of wind tower, z=70m) and angle of attack 3°. By using the lift, drag coefficient and the appropriate assumption of the blade length, the number of blade and the tip speed ratio(TSR), the proper blade shape was obtained. On the base of this basic study, various conditions for Reynolds number and aerodynamic analysis including angle of attack according to parametric test need to study more in the future. Also assessment for the blade need to study safety on wind pressure coefficient and distribution according to wind characteristics.
This paper presents the results of application and numerical prediction of wind pressure distribution and coefficient over building cladding. The analysis of wind pressure assessment due to wind-resistant design and wind effect to surrounding buildings is important to building cladding. This paper simulates the wind pressure distribution to the building and wind flow pattern around the building cladding, and shows the usability of CFD analysis to design process of building. A Navier-Stokes-Solver with Quick spatial discretization scheme and RNG k- ε turbulence model has been applied to the computation of the three dimensional turbulent flow.
An extension of cubic sets is discussed, and its applications in $BCK/BCI$-algebras are considered. The notion of a cubic intuitionistic set is introduced, and related properties are investigated. Cubic intuitionistic subalgebras/ideals are introduced, and several properties are investigated.
본 논문은 이동 위성통신을 위한 능동위상배열 안테나 시스템의 주요 부품 중의 하나인 빔 성형모듈 설계에 관하여 서술한다. 본 모듈은 주 신호 및 추적신호를 위한 두 개의 모듈로 구성되어 있다. 이중, 주 신호블록은 위상배열 안테나로부터 입력된 신호전력을 추적신호 블록으로 전송하는 역할을 수행하며, 추적신호 블록은 능동위상배열 안테나 시스템의 주요 기능인 추적신호의 빔 성형과 전자적 빔 제어기능을 수행한다. 또한, 본 모듈은 위상특성 및 선형이득 등의 시스템에서 요구되는 전기적 사양을 만족하며, 해당 성능의 보다 면밀한 검증을 위하여, 제작된 빔 성형모듈을 장착한 능동위상배열 안테나 시스템을 이용하여 야외구동시험을 수행하였다. This paper is concerned with the design of the beam forming module that is a key unit of the active phased array antenna(APAA) system for mobile satellite communications. This module includes two blocks for main signal and tracking signal. Main signal block has the role of transmitting input signal from phased array antenna to tracking signal block. And, tracking signal block executes main roles, beam forming of tracking signal and electronic beam control. The several electrical performances of this module, phase characteristics and linear gain, etc., agreed with specifications needed fur APAA, and for more clear verification of the performances, the satellite communication test of the APAA including the modules was accomplished in the outdoors.
There have been issues which are important in the dwelling life in terms of perception of lighting environments and also the understanding luminous words of resident. This study carried out a survey for dwelling life environments between Korean resident in USA and American in order to comparison between them about the effects of lighting in the house. The survey has several matters that is the effects for dwelling life environment perception by means of the lighting in the house. It has compared between them in order to analyze about perception of dwelling life environments by the lighting that they researched more variety dwelling preference more than specific tendency in some issues. Therefore, this study presents dwelling preference for lighting in the house in comparison with them. According to survey all of them, when the residents in this research people have a decision for their housing, they valued those attributes like lighting life environments relationship between lighting and life environments and housing structural plan. In order to comparing, the samples by means of the survey were carried out analysis of cross-tabulation and reviewed chi-square. Reviewing major samples through the variables, each group of samples were analyzed that there was considerable difference between dwelling life environment as well as luminous words each group of resident. It is desirable that make a reasonable lighting perception based on the results of this study reviewing tendency of a variety of dwelling life environments and comparison with them.