• 산업경영시스템학회지
• /
• 제36권2호
• /
• pp.1-7
• /
• 2013

Cleanroom could be largely classified into industrial cleanroom that can be contaminated by particles and bio-cleanroom that can be contaminated by biological particles. Electrical manufacturing companies producing precision machines and electrical parts essentially have industrial cloom facilities and clean technologies to produce defects free products due to particles. Industrial cleanroom should be controlled in respect of 4M1E to prevent from foreign materials of sub-micro unit and to keep out contamination sources from outside. In this paper, a concept for a quantitative methodology to measure the particles from running components was suggested by combining both newly making clean booth such as wear tester and laser particle counter.

• 디지털융복합연구
• /
• 제11권12호
• /
• pp.803-810
• /
• 2013

지역아동센터는 아동의 지역사회 내 건강하고 안전한 보호와 적응으로의 종합적 복지서비스를 담당하는 사회복지서비스기관으로, 한정된 자원을 가지고 서비스의 효과성을 높이기 위해서는 지역사회연계가 필수불가결하다. 그러나 지금까지의 지역사회연계는 매우 협의적이며 제한적인 의미로만 사용되었으므로 지역사회 내에서 성장하고 지역사회를 배움의 터로 활용해야하는 아동에게는 그 어느 영역보다 넓은 의미에서의 지역사회연계에 대한 새로운 해석이 요구되어진다. 이에 본 연구는 생태체계론적 관점에서 보다 "확장된 개념"의 지역사회연계에 대한 탐색적인 고찰을 통해 아동, 그 중 더욱 사회적 관심과 지원이 촉구되는 빈곤 등의 취약상황에 놓인 아동들의 지역사회 적응과 자기성장을 돕는 기초적 자료로 활용코자 하는 목적을 가지고 있다.

• 동력기계공학회지
• /
• 제13권6호
• /
• pp.123-128
• /
• 2009

The effects of temperature and initial crack length on the impact fracture behavior for the side plate material of FRP ship were investigated. And the effects of the counterpart roughness and sliding distance on the volumetric wear of same material were investigated as well. Impact fracture toughness of GF/PE composites displayed maximum value when the temperature of specimen is room temperature and $50^{\circ}C$, and with decreasing the temperature of specimen, impact fracture toughness decreased. Impact fracture energy of GF/EP composites decreased with increasing the initial crack length of specimen, and this value decreased rapidly when the temperature of specimen is lowest, $-25^{\circ}C$. It is believed that sensitivity of notch on impact fracture energy were increased with decreasing the temperature of specimen. With increasing the sliding distance, the transition sliding distance, which displayed different aspect on the friction coefficient and the volumetric wear loss, were found out. Counterpart roughness had a big influence on the wear rate at running in period, however the effect of counterpart roughness became smaller with sliding speed increase in. Volumetric wear loss were increased with increasing the applied load and the counterpart roughness.

• 대한기계학회논문집A
• /
• 제26권6호
• /
• pp.1178-1186
• /
• 2002

Clean stockers are being used by semiconductor and TFT-LCD manufacturers to store and buffer work in process. The only way to keep the stored product clean is to provide constant clean airflow the product and through stocker. Up to now, stockers typically have been configured to receive their laminar airflow from fan filter units that are located on the side of the stocker. This type of stocker may have such problems as complexity of structure, increment of temperature, mechanical vibration, initial investment and running cost. In this study, in order to solve the above mentioned problems, new air control system in stocker is proposed, which is to control open ratios of exits that are located on the side of the stocker without fan filter units. In this study, static pressure regain was used for the analysis of the open ratios of exits theoretically and experiment was also conducted using actual clean stocker for TFT-LCD manufacturers and CFDesign, was used for simulating airflow in stocker. As a result, open ratios of exits can be obtained by the analysis of static pressure regain and was verified by experiment and simulation results. Therefore, new air control system in stocker can be used by the semiconductor and TFT-LCD manufacturers.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2006년도 추계학술대회논문집
• /
• pp.262-265
• /
• 2006

In order to investigate characteristics of floor impact sound generated in the apartment buildings, questionnaire survey was conducted for respondents living in apartments in 200t. Questions in the surrey were on the characteristics of real impact sounds, subjective annoyance and satisfaction on the heavy and light impact sources. From the survey results, it was found that most annoying time of a day and the space were 8 p.m. to midnight at living room. It was also revealed that the main source of the floor impact sound from the upper floor is a child's jumping and running at from six to nine. More than half of people were not satisfied on the floor impact isolation performance of their own apartments. The percentage of residents who were annoyed by the heavy-weight impact sound such as children's jumping and adult's walking was $5{\sim}10%$ lower than by light-weight impact sound. In addition, females being responded more annoyed by floor impact sound than males.

• 한국식품영양학회지
• /
• 제10권4호
• /
• pp.462-467
• /
• 1997

최근 건조 및 탈수공정으로 사용되고 있는 침지(soaking)에 의한 방법인 DIS 공정(dewatering and impregnation soaking process)은 상온에서 침지용액에 식품시료를 담금으로서 시료내의 수분이 탈수되는 현상을 이용한 공정으로서 이 때 용액 속의 용질들이 시료 속의 세포 내로 침투하는 확산현상도 동시에 발생한다. 따라서 영양분의 손실과 관능적 품질저하를 억제할 수 있으며, 건조시의 에너지를 절감하는 등의 특성을 갖는다. DIS 공정에서는 용질의 크기에 따라 원형질막 분리현상과 세포벽 붕괴현상이 발생하며, 시료의 조직상태와 운전조건에 의하여 그 탈수 정도는 차이가 나타난다. DIS 공정을 제어하기 위한 모형화는 주로 비정상상태에서의 Fick의 법칙과 물질수지를 기초로 한 여러 가지 모델들이 제안되어 등온상태에서 시간에 따른 탈수량과 용질 침투량을 정확히 예측하고자 하고 있다.

• 한국콘텐츠학회논문지
• /
• 제13권11호
• /
• pp.79-86
• /
• 2013

일반적으로 애니메이션에서 표현된 음식은 문화의 정서를 상징적으로 나타내는데, 음식에 대한 상징적 해석은 문화기호학적 측면에서도 다양한 연구가 이루어지고 있다. 본 연구에서는 미국과 일본의 애니메이션에 표현된 음식 장면에 초점을 두어, 1980년대 미국의 대표적인 가족 구성 애니메이션 "심슨(The Simpsons)"과 2002년 TV아사히에서 방영되어 2009년까지 일본 가족의 소소한 이야기로 큰 공감대를 형성하여 큰 사랑을 받아 온 "아따신찌(あたしンち)"를 대상으로 비교분석 하였다. 본 연구를 통해 애니메이션 제작 단계에서 인지적 작용의 중요한 요소가 되는 문화적 배경에 대한 이해와 애니메이션 표현의 상징적 속성에 대한 비교사례로서 작품 제작에 있어 하나의 기준으로 적용되기를 바란다.

• 한국자동차공학회논문집
• /
• 제14권2호
• /
• pp.39-48
• /
• 2006

An engine cooling system affects overall performances of an engine which has been recently requested higher power in more confined engine room. The design of efficient cooling system demands a great effort to effectively correlate with each components, such as water jacket, radiator, coolant pump, cooling fan, etc. Thus, the aim of this study is to provide the design tool of the cooling system in the early design stage by enabling for the designer to accurately predict the engine cooling performances. This user-friendly design tool has various ways to assemble each components and control the running condition with related database. The present design tool was simulated and compared with experimental data. As a result, the inlet and outlet temperature of the radiator agree very well with experiments. It was concluded that the present design tool could be effectively used for the design of the engine cooling system.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2003년도 추계학술대회 논문집(III)
• /
• pp.204-209
• /
• 2003

Recently, The TCN(Train Communication Network} as the distributed control systems for electric vehicles, which is the international standard of the intra vehicle communication, actively recognizes variations and supports reconfiguration of the train network when a vehicle is separated or recombined. The technique of reconfiguration to take variety and interoperability of a vehicle constitution is used when the vehicle constitution is changed. At the time, each node making up vehicle network shares the information about the variation of vehicle constitutions and the state of nodes. In the hierarchical TCN structure, an exchange of data becomes available as a work to transmit information between components is performed at the node playing a role of gateway. This paper proposes a protocol to transmit the information of the train reconfiguration. The protocol gives an application to renew a list for transmitting information and to perform the transmission that can guarantee periodic and non-periodic data transmission between nodes when the network nodes changed by a variation of the network state are reconfigured. If use this protocol, can use functions that are offered in the electric railcar at the same time that composition of vehicles is completed without delay. And when driver of the electric railcar inspect before running of vehicles, can confirm state of vehicles visually through monitor in driver's room.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2000년도 추계학술대회논문집
• /
• pp.307-310
• /
• 2000

Recently, the demand for the Floating, Production Storage, and Offloading facility(FPSO) which has some economic and technical advantages, has increased in offshore oil production areas. The basic characteristics of a 343,000 DWT class FPSO which is being built in Hyundai Heavy Industries and shall be installed in offshore Angola, is almost same as that of oil carriers. However, she do not have self-propulsion system, but has additional facilities for oil production and positioning system. Main noise source contributing to the cabin noise of the accommodation, are classified into the machine in the engine room and the deckhouse, HVAC system, and the topside equipments. In general, the noise regulation for the offshore structure is much severer than that of the common commercial ships and the maximum acceptable sound pressure level of cabins is specified in 45dB(A). This paper describes the procedure of noise analysis along with its results. Noise analysis has been carried out for the case of emergency diesel generator running condition and the case of normal production condition and the results has been compared with the measurement results of the first case. Based on the results, proper countermeasures to reduce excessive noise level has been applied considering the characteristics of sources and receiver spaces and can be satisfied the specifications at all spaces.