• Journal of the Korean Society of Food Culture
• /
• v.10 no.1
• /
• pp.67-74
• /
• 1995

This study researched microbial change of quality according to the various phases of product flow of cooked pea and rice, cold cucumber and seaweed soup, soybean sprouts japchae feeding urban type of a commissary school and a satellite school in Daejeon area, also it suggested the possibility that the central commissary foodservice system can be established and utilized more developmental to identify its food of variation of temperature and state of safety unitl 3 hours after cooking for the case of delay of distribution and holding because of the satellite school of geographical location and traffic problem. The critical Control Points identified for each category of menu items were: Boiled pea and rice: inadequate distribution, holding and storing before assembly; Cold cucumber and seaweed soup: pre-preparation and post-preparation after cooking; Soybean sprouts japchae: Pre-preparation, post-preparation and storing. As the result of observation of the variation of temperature and microbial safety according to the delay of distribution and holding for each food, all of them were relatively safe until 3 hours after cooking, but cold cucumber and seaweed soup being stored for 3 hours, the value of E. coli is $10^3$ CFU/g. The variation of temperature was more extreme in soybean sprouts japchae than cooked pea and rice and cold cucumber and seaweed soup. It was proved that the stainless container was excellent and that adequate holding container should be used.

• KIEAE Journal
• /
• v.17 no.5
• /
• pp.87-94
• /
• 2017

Purpose: Prefabricated modular space such as a container construction has recently been interested unlike the conventional construction method, and their scale have expanded from small buildings such as cafes, houses and pensions to shopping centers, complex cultural spaces where shows and exhibitions are possible doing. In this way, the container is in the spotlight as an advantage such as mobility, flexibility, correspondence, economic efficiency, recyclability and so on. However, there are no specific guidelines and standard design methods in aspects of structural calculation, functional insulation and environmental configuration. Therefore, as the first step to resolve these problems, this study has focused on the field of environmental performance of container construction, presented appropriate guidelines and searched ways to improve performances. Method: For this study, seven types of the modular building were chosen and compared, and their energy performances have been analyzed using a proven simulation tool. Essential methodology and terminology were examined to estimate and judge their efficiency. Result: In conclusion, energy performances depend on specific configuration of combined unit spaces, and design guidelines cold be set up for promoting their use in the practical field.

• Food Science and Biotechnology
• /
• v.18 no.6
• /
• pp.1392-1397
• /
• 2009

This study was aimed at developing a low cost cold storage system for agricultural products. Three kinds of slurries: $K_1$, $K_2$, and $K_3$ slurries were developed using phase change materials (PCMs) such as tetradecane, octadecane, and sodium polyacrylate to maintain the desired temperature ranges. The slurries were manufactured by in-situ polymerization. Tetradecane and octadecane were capsulated in a core with melamine at the surface. The thermodynamic characteristics of the slurries were measured and analyzed. The latent heats of the $K_1$, $K_2$, and $K_3$ slurries at the melting points were 206.41, 186.88, and 147.91 kJ/kg, respectively. A transportable cold storage container was built to investigate the performance of the slurries as thermal storage media. The temperatures at the insides of the container could be maintained in the ranges of 0-5, 5-10, and $10-15^{\circ}C$ for more than 23, 27, and 60 hr with the $K_1$, $K_2$, and $K_3$ slurries, respectively.

• Transactions of Materials Processing
• /
• v.14 no.1 s.73
• /
• pp.57-64
• /
• 2005

This study deals with the cold forging process design for shaft in the main part of automobile motors with rectangular deep groove. In forging process, the accuracy and die lift is very important because it have influence on reduction of the production cost and the increase of the production rate. Therefore, it is necessary to develop the manufacturing process of shaft by cold forging., process variables are the cropped face angle of billet and the eccentric load of punch. The former is derived from cropping test, the latter is occurred by clearance between container and preform. Also, grooved preform select the process variable for decrease in punch deflection. We investigate that a deflection of punch and a deformation of preform to every process variables. Through this investigation, we suggest the optimal preform and process design, expect to be improved the tool life in forging process.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.22 no.12
• /
• pp.891-896
• /
• 2010

The objective of the present study is to reveal the effects of a phase-change material on the performance of a Kimchi refrigerator. Two-percent salt water, of which melting temperature was $-1.1^{\circ}C$, was used for the phase-change material. The salt water was packed in silicon cases and inserted between Kimchi container and the copper pipe of the evaporator. The maximum and minimum temperatures of the inner wall of the Kimchi container without salt-water pack were $-0.2^{\circ}C$ and $-8.9^{\circ}C$, which were remarkably improved by using the salt-water packs, resulting $-0.5^{\circ}C$ and$ -1.9^{\circ}C$. This shows a useful application of using phase-change materials for accurate temperature controls.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
• /
• 2005.11a
• /
• pp.127-139
• /
• 2005

It is very difficult to export the fresh agricultural products to long distant countries such as America and EU without any damage. Fresh exporting products would be met very hazardous environments such as hot and cold weather, heavy trembles with rolling and pitching. Therefore, care should be taken on tight fastening the products inside the container and keeping the designated temperature and relative humidity. The physical strength of outer box should be applied differently because each agricultural product has its own character for packaging. There have been many agricultural products researches for export packaging to the U.S.A. so far. However they have never got desirable results which enough to apply it in real. The main purpose of this research is to develop optimum compressive strength of corrugated fiber board box which would be used to American export packaging of fresh agricultural products such as perilla leaves, green red pepper and spinach.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.21 no.5
• /
• pp.577-582
• /
• 2015

This paper is the fundamental study for the application of cold storage system to the transportation equipment by sea and land. This numerical study presents the solid-liquid phase change phenomenon of calcium chloride solution of 30wt %. The governing equations are 1-dimensional unsteady state heat transfer equations of $1^{st}$ order partial differential equations. This type of latent heat storage material is often usable in fishery vessel for controlling the temperature of container with constant condition. The governing equation was discretized with finite difference method and the program was composed with Mathcad program. The main parameters of this solution were the initial temperature of heat storage material, ambient temperature of cold air and the velocity of cold air. The data of boundary layer thickness becomes thin with the increasing of cold air flowing velocity and also the heat storage completion time become shorten.

• Journal of Biosystems Engineering
• /
• v.33 no.5
• /
• pp.303-308
• /
• 2008

The freezing characteristics of two kinds of phase change materials (PCM) encapsulated in a spherical container were investigated with various cooling air temperatures and velocities. The super cooling and solidification time of PCM were highly affected by cooling air temperature and velocity. The experimental equations are derived to express total solidification time of the PCM in terms of Nusselt number and dimensionless temperature.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2019.05a
• /
• pp.15-18
• /
• 2019

점점 더 많은 어플리케이션이 Serverless 컴퓨팅 기반으로 구현되고 있다. Serverless 서비스 제공자는 가용자원을 확보하기 위하여 요청이 장시간동안 발생하지 않은 서비스 인스턴스를 종료한다. 종료된 인스턴스에 대한 요청은 Cold Start 로 인한 지연시간이 발생하게 된다. 서비스 사용자는 Cold Start 를 방지하기 위해 인스턴스가 종료되지 않도록 주기적으로 의미 없는 요청을 하게 되고, 이는 Serverless 서비스 시스템에 불필요한 오버헤드를 발생시키게 된다. 따라서 이 논문은 이러한 불필요한 오버헤드를 줄이기 위한 전략을 제시하고 그 구현에 관해 설명한다.

• Journal of Korean Medical classics
• /
• v.19 no.2 s.33
• /
• pp.108-114
• /
• 2006

Three planks of the Triangular position theory was first introduced by Sanghallon(傷寒論) authored by Jang Gi. It is the regulation for the matter of diagnosis of three different clinical symptoms in the causes of exogenous disease. It brought two questions to the scientists. First question is what are the Wind stroke(中風), Affection by cold(傷寒) and the complex form of Wind stroke(中風) and Affection by cold(傷寒) mentioned in Sanghallon. It is related to the theoretical analysis of the causes for the outbreaks of exogenous disease. Second question is what are the characteristics of symptoms to use Gyejitang, Mahwangtang, Daecheongnyongtang according to Sanghallon? It is the matter of clinical skills for dispensing a prescription. Through the theoretically and empirically deepening processes for last two millenniums, those two questions brought us two more problems further. That is, how and by what processes the Six vital substances for humal life outbreaks disease as a energy transformation? And, how the individual peculiarities of human body as a disease container should be treated? In conclusion, it is also a matter of the existence of dialectic medical science.