• 한국실내디자인학회논문집
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• 제16권6호
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• pp.47-55
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• 2007

The purpose of this study is to evaluate environmental characteristics of maternity rooms. The method of this study is a field survey on 8 samples of postpartum care centers in Seoul. The plan, colors, materials, furniture and environmental characteristics of maternity rooms are analyzed. The characteristics of maternity rooms environment were categorized into four items; comfort, privacy, communication and dwelling. The results are as follows: Western-style and rooming-separation system of maternity rooms are used. Maternity rooms are generally good for dwelling quality but insufficient for communication. There are a lack of supply to control a temperature Individually in maternity rooms. It demands to make the type of one-sided public space between maternity room and living room for privacy. All of the maternity rooms surveyed are furnished with TV, radio, and telephone but, to improve communication with visitors, it is recommended that more convenient supplies such as audio and video system, chairs, and table be equipped. There are needs for sky-light windows in maternity rooms. It is necessary to research more about the space of living room, nursing room and service area, and we need more study about baby, nurser and owner' spaces.

• 한국군사과학기술학회지
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• 제20권6호
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• pp.813-821
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• 2017

This paper presents the study result on a realization of wireless umbilical device for missile systems. In general, a missile system is connected to a fire control equipment via an umbilical connector to get the electrical power for its internal equipment and communicate with each other. And these connectors inherently have many problems of mis-contact between pin and socket, and mis-separation during missile firing, etc. A wireless umbilical device using LC resonance is devised to solve these problems of the current technology. For hundreds of watts power transmission under the missile system environment of restricted space, we designed and made a prototype of wireless umbilical device. And we tested this wireless umbilical device with an aluminum cylinder having cutout windows which simulate missiles. We realized that the wireless technology can be used as a substitute for the conventional umbilical connectors, and EMI and environment tests should be followed further.

• 한국가구학회지
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• 제22권4호
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• pp.287-298
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• 2011

In this study, I wanted to propose the design direction of the furniture and products in bathroom space so that the elderly's life is well supported to meet such aging societies that are getting older. Therefore, I have drawn the elders' needs by investigating their characteristics through literature research and used such needs as a frame of analysis to analyze the bathroom furniture and products made in Korea and foreign countries. The analysis results indicate:First, the elders need entertainment, health care, environment-friendly, convenience, good accessibility, chair-based bath and space separation; second, both Korean-made and foreign-made bathroom products are difficult to be controlled, invisible of font, hard to sustain the elders' bodies, inconvenient to be used and etc; and third, the design to solve such problems should be with intuitive user interface, easy control, better accessibility, the elders' moving patterns and living habits considered, health care, pro-environmental product. This study puts emphasis on the reflection of socio-cultural characteristics in designing bathroom furniture & items for aging society and requires more bathroom products with various designs in the foreseeable future.

• 전기학회논문지
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• 제67권6호
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• pp.724-729
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• 2018

This paper presented an evaluation method for the efficiency uncertainty of an inverter-fed three-phase induction motor using FEM. The motor efficiency in the FEM is calculated by the IEC 60034-2-3 as in the actual test. In the process of evaluating the efficiency uncertainty, the difference between the finite element method and the actual test is the method of calculating the type-A / B standard uncertainty of the input quantity to estimate the efficiency and each losses. For the input quantities which can confirm the instantaneous values with respect to time, the type-A standard uncertainty in the FEM is calculated from the RMS values or average values having separate periods in the steady state. And, the type-B standard uncertainty in the finite element method is assumed to be zero. Also, this paper compared and analyzed the efficiency uncertainty evaluated by the proposed method and the efficiency uncertainty through the actual test.

• 조명전기설비학회논문지
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• 제25권5호
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• pp.85-91
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• 2011

A grounding system is generally composed of several vertical, horizontal electrodes or grids. Excessive ground potential rises due to adjacent grounding electrodes can cause failures or misoperation of electronic devices and control systems. It is therefore necessary for computer-related and information-oriented equipment to be placed at a sufficient distance from the areas influenced by grounding electrodes. In this paper, in order to propose a method for evaluating the ground potential rise and interference in the vicinity of vertical grounding electrodes, the experimental and theoretical results on the potential interference between vertical grounding electrodes and its frequency dependence were described. The ground potential rise is sharply decreased with increasing the distance between grounding electrodes. In case that the separation of vertical grounding electrodes is less than 1.5[m], the potential interference coefficient was greater than 0.1 and linearly increased with the frequency of the test current within the frequency of 1[MHz].

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.499-502
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• 2010

프로그램의 복잡화와 대규모프로그램의 등장으로 다중작업을 분할하여 소규모 단위의 Task로 나누고 각각의 Task를 우선순위에 따라 스케쥴링을 수행해야하는 요구가 점점 확대되고 있다. 또한, 프로그램 개발환경의 다양화로 인하여 프로그램을 구현하다 보면 다양한 환경 조건에 맞춰서 개발하게 된다. 예를 들어 Embedded 환경인지 Windows 환경인지에 따라 다르고 운용체제의 사용에 따라서도 제약사항을 가져오는 경우가 많다. 이에 개발환경과 운용체제에 의존적이지 않도록 다중작업 분할처리를 수행할 수 있는 적응형 스케쥴링 기법을 소개한다. 본 논문에서는 적응형 스케쥴링 기법에 적용된 알고리즘에 대한 설명과 구현 후 적용한 사례를 기반으로 한 내용을 다룬다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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• pp.374-375
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• 2006

This paper describes anodic bonding characteristics of MCA to Si-wafer using evaporated Pyrex #7740 glass thin-films for MEMS applications. Pyrex #7740 glass thin-films with the same properties were deposited on MCA under optimum RF sputter conditions (Ar 100 %, input power $1\;W/cm^2$). After annealing at $450^{\circ}C$ for 1 hr, the anodic bonding of MCA to Si-wafer was successfully performed at 600 V, $400^{\circ}C$ in $110^{-6}$ Torr vacuum condition. Then, the MCA/Si bonded interface and fabricated Si diaphragm deflection characteristics were analyzed through the actuation and simulation test. It is possible to control with accurate deflection of Si diaphragm according to its geometries and its maximum non-linearity being 0.05-0.08 %FS. Moreover, any damages or separation of MCNSi bonded interfaces did not occur during actuation test. Therefore, it is expected that anodic bonding technology of MCNSi-wafers could be usefully applied for the fabrication process of high-performance piezoelectric MEMS devices.

• 상하수도학회지
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• 제13권1호
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• pp.72-80
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• 1999

Separation of VOCs(Volatile Organic Compounds) in Water Using Activated Carbon is known to be effective. Activated Carbon has been and will be employed in many water treatment plants. Simplified plug flow homogeneous surface diffusion model(PFHSDM) has been used to predict adsorption of organic matter. Finite Element Method(FEM) was used to analyze the model. Out of water quality control substances, benzene, toluene and tetrachloroethylene were used in the small column test. Film diffusion coefficients and surface diffusion coefficients were obtained from the column test, and were compared with the modeling results. Mc Cune, Williamson, William and Kataoka model, were compared with film diffusion coefficients obtained in the test. McCune model was fitted best for those VOCs used in this experiment. Film diffusion coefficients of VOCs obtained were benzene 0.265 cm/min, toluene 0.348 cm/min and tetrachloroethylene 0.298 cm/min. Surface diffusion coefficients of VOCs obtained were benzene $6.36{\times}10^{-8}cm^2/min$, toluene $3.20{\times}10-8cm2/min$, and tetrachloruethylene $4.94{\times}10^{-8}cm^2/min$.

• Journal of Mechanical Science and Technology
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• 제19권12호
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• pp.2197-2204
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• 2005

The combination of Gas chromatography (GC) for separation and Flame Ionization Detection (FID) for detection and identification of the components of a mixture of compounds is a fast and strongly proved method of analytic chemistry. The objective of this research was to design a combined High-speed miniature screening Gas chromatograph along with a Flame Ionization Detector for quick, quantitative and qualitative analysis of gas components. This combined GC-FID system is suitable to detect the volatile and semi-volatile hydrocarbons present in a gas mixture. The construction made it less expensive, easy to use and movable. The complete gas path was developed. On/off valves, temperature and flow sensors and their interface electronics were used for controlling purpose. A Microcontroller was programmed to measure the temperature and gas flow using the sensors and to control and regulate them using the electronics and valves. A pocket PC with its touch screen served as a user interface for the system. Software was developed for the pocket PC, which makes the communication possible with the Microcontroller. The system parameters can be indicated in the Pocket PC as simple text and also the analysis result can be displayed.

• 한국식품조리과학회지
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• 제20권1호
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• pp.63-75
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• 2004

This study was conducted to establish the hygiene standards for chicken entrees (deep-fried breast chicken, chicken and potato in red pepper paste and smothered chicken) served with in 3 different elementary school lunch programs during 2002. The study evaluated the layout characteristics of the food facilities, and determined the physical and microbiological hazards for the production of chicken entrees based on the HACCP(Hazard Analysis Critical Control Point) system. The kitchen layouts needed to be remodeled for the separation of soiled and clean work areas. The pH values for all items were over 6.0, which require careful attention. The microbial assessments of 3 chicken items revealed that the TPC, coliforms and Staphylococcus aureus were within normal ranges, but Salmonella was found at several stages in the production of all products, with the exception of smothered chicken. The bacterial counts of the kitchen utensils and cooks' hands exceeded acceptable limits, and workers' sanitary practices were poor in terms of sanitary handling and holding of foods and utensils. The CCPs determined related to the steps of receiving, cooking and breaking of egg shells. From our findings, it is recommended that chicken entrees should be prepared and served very carefully, as salmonella was detected at several stages during meal production, and the aim of the HACCP system is to secure against food-borne illnesses due to reckless school food service operations.