• Journal of the Korean institute of surface engineering
• /
• v.28 no.5
• /
• pp.309-319
• /
• 1995

The substrate patterned with the dry film has the cavity which has the $90^{\circ}$ wall angle. Electroplating Cu on this patterned substrate has the differrent shape history with the electrochemical parameters. By potential theory model, the reason of the variation of the shape change with the these parameters was investigated. The shape history could be explained by the current flow and the correlated area effects. By embedding the Ni layer between the Cu layers, shape history with the time was obtained experimentally and the results was compared with the numerical analysis by BEM. The adhesive Cr-Cu film in TAB application was etched with the various condition. The best condition for the etchant of the Cr-Cu film was found.

• International Journal of Automotive Technology
• /
• v.4 no.4
• /
• pp.157-164
• /
• 2003

An experimental and numerical study was performed to investigate the macroscopic and microscopic atomization characteristics of high-speed diesel spray issued from the common-rail injection system. For the experiments, spray visualization system and a phase Doppler particle analyzer system were utilized to obtain the spray atomization characteristics such as the process of spray development, spray tip penetration, and SMD distribution. In order to analyze the process of spray atomization with KIVA-3 code, the TAB breakup model is changed to the KH-DDB competition model, which assumes the competition between the wave instability and droplet deformation causes the droplet breakup above the breakup length. The calculated results were also compared with the experiments in terms of spray tip penetration and SMD distribution. The results provide the process of spray development, axial and radial distribution of SMD, and calculated overall SMD as a function of time after start of injection.

• Journal of the Korean Society of Visualization
• /
• v.8 no.3
• /
• pp.41-48
• /
• 2010

A visualization study to evaluate bubble motion in a tab water filled cylindrical tank with a varying flow rate of compressed air is conducted. The flow rate of compressed air varies from 1 to 5 L/min. Time resolved images are acquired by a high speed camera in 10 bit gray level at 100 fps and the measurement volume is irradiated by a 230 W halogen lamp. It is observed that there are three different regions; the bubble formation region, the rising bubble region and the free surface region. During the rise of bubble, the shape is changed as if an elastic body. Based on the binarized bubble image, the mean diameters of rising bubbles are estimated at beneath of the free surface. As the gas flow rate increases, the mean diameter is increased and the rising velocity also increases with buoyancy force.

• 월간 기계설비
• /
• s.167
• /
• pp.16-19
• /
• 2004

관악구 신림동에 위치한 관악우체국 청사 개축 기계설비공사는 정보통신부 조달사무소로부터 분리발주로 수주된 현장이다. 미작산업(주)(대표 배태석)와 (주)광운기전(대표 이광수)이 기계설비공사를 공동도급으로 시공하고 있으며 미작산업이 51%, 광운기전이 49%의 공사를 맡고 있는데 기계실 및 공조배관, 덕트. 위생배관 등 주요 공사는 광운기전이, 정화조, 자동제어, TAB, 연도 등 주로 외주제작은 미작산업이 시공하고 있다. 원래는 광운기전과 일성공업이 공동으로 수주받았으나 일성공업이 부도나는 바람에 일성공업의 보증업체인 미작산업으로 대체된 것이다. 공사금액은 13억9천 5백만원으로 지난 2003년 10월에 시작하여 오는 2006년 1월까지 완공예정이었으나 공사의 빠른 진행으로 6개월여를 앞당겨 오는 2005년 6월경 완공 예정이다.

• Journal of the Korean housing association
• /
• v.13 no.3
• /
• pp.45-53
• /
• 2002

The purpose of this study is to examine the characteristics of unit plans in the high-rise mixed-use condominium and to provide the data fur architectural planning and design. The tools of statistical analysis are frequency, percentage, mean, cross-tab, and correlation. The results of this study are as fellows; The most frequently found shape of unit is a deformed polygon. The common rooms in housing units are dressing room, powder room, offset-kitchen, family room, passage, hallway, and foyer. The specially prepared spaces are wash room, home bar, independent porch, and garden. As to room size and area ratio in a dwelling unit, those of living room are biggest and highest irrespective of unit size. As the floor area of unit increases, does the size of each room and space but the area ratio of each room decreases. This research is made to develop an Apartment Information System. This integrated information system is to be designed to provide residents of high-rise mixed-use condominiums with convenient, economical, and safe life.

• Proceedings of the Korean Information Science Society Conference
• /
• 2007.06c
• /
• pp.281-286
• /
• 2007

유비쿼터스 컴퓨팅이란 사용자에게 지속적인 서비스를 제공해주는 컴퓨팅 환경을 말한다. 끊임없이 동적으로 변하는 유비쿼터스 환경에서 수많은 상황데이터가 발생을 하고 상황정보로 추상화하는 과정이 필수적이다. 상황인지시스템은 동적인 상황정보에 대한 생성, 조작, 공유 등이 일관성 있게 이루어져야 한다. 이러한 상황정보의 조작을 위한 수많은 상황인지 모델이 제시되고 연구되어 왔다. 본 논문에서는 유비쿼터스 환경을 위한 온톨로지 기반 상황인지 시스템을 제시한다. 상황정보에 대한 생성, 컨텍스트 추론, 지식의 공유을 위해 온톨로지 표준언어인 OWL을 사용한 컨텍스트 온톨로지를 생성한다. 디바이스의 상황정보 생성을 위해 SWRL 규칙언어를 사용하고 생성된 디바이스 상황에 고장진단 및 수리서비스를 제공하기 위해 규칙추론기반 언어인 Jess를 사용하고 OWL기반의 컨텍스트 온톨로지와의 연계를 위해 Jess Tab API를 사용한다.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1167_1168
• /
• 2009

This paper presents new configuration of a.c. traction power supply system. The proposed system includes autotransformer with variable tab. The voltage drop in traction power supply system can be reduced due to tap change of autotransformer. In this paper, fault current and Impedance is investigated, when fault occurs in traction power supply system.

• Journal of Mechanical Science and Technology
• /
• v.17 no.11
• /
• pp.1812-1819
• /
• 2003

This paper presents the effect of injection pressure on the atomization characteristics of high-pressure injector in a direct injection gasoline engine both experimentally and numerically. The atomization characteristics such as mean droplet size, mean velocity, and velocity distribution were measured by phase Doppler particle analyzer. The spray development, spray penetration, and global spray structure were visualized using a laser sheet method. In order to investigate the atomization process in more detail, the calculations with the LISA-DDB hybrid model were performed. The results provide the effect of injection pressure on the macroscopic and microscopic behaviors such as spray development, spray penetration, mean droplet size, and mean velocity distribution. It is revealed that the accuracy of prediction is promoted by using the LISA-DDB hybrid breakup model, comparing to the original LISA model or TAB model alone. And the characteristics of the primary and secondary breakups have been investigated by numerical approach.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.12 no.3
• /
• pp.44-50
• /
• 2004

The purpose of this study is to improve the prediction ability of the atomization and vaporization processes of GDI spray under high-pressure and high-temperature conditions. Several models have been introduced and compared. The atomization process was modeled using hybrid breakup model that is composed of Conical Sheet Disintegration (CSD) model and Aerodynamically Progressed TAB(APTAB) model. The vaporization process was modeled using Spalding model, modified Spalding model and Abramzon ＆ Sirignano model. Exciplex fluorescence method was used for comparing the calculated with the experimental results. The experiment and calculation were performed at the ambient pressure of 0.5 MPa and 1.0 MPa and the ambient temperature of 473k. Comparison of caldulated and experimental spray characteristics was carried out and Abramzon ＆ Sirignano model and modified Spalding model had the better prediction ability for vaporization process than Spalding model.

• Environmental Analysis Health and Toxicology
• /
• v.4 no.3_4
• /
• pp.61-75
• /
• 1989

Influences of the concurrent administration of carbon tetrachloride and prednisolone on the biometric, biochemical and histological findings were investigated in male rats prefered twice Sosio-Tang extracts at intervals of 24 hours. Influences of the concurrent admininistration of carbon tetrachlorides and prednisolone twice a week respectively on the findings were also investigated in male rats fed freely diet and. tab water mixed with Sosio-Tang extracts for six weeks. 1. Sosio-Tang extracts. decreased the toxicity of carbon tetrachloride. This was proved by biometric, biochemical and histological findings. 2. Prednisolone increased the toxicity caused by carbon tetrachloride. 3. The group treated with Sosio-Tang extracts. and prednisolon concomitantly increased the toxicity compared with Sosio-Tang extracts. treated group.