• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.11 no.6
• /
• pp.163-168
• /
• 2001

Vibration problems occurred in an air cooled heat exchanger with axial flow fan for a petrochemical plant were investigated. Experimental field test and theoretical verification were performed. To find the main cause of the high vibration of the fan at the air inlet of the axial fan, the frequency spectrum was measured. The natural frequency of the driving support of the heat exchanger was numerically calculated. Both of the measured and the natural frequency were approximately equal to the blade passing frequency. Because it was difficult to modify the structure of the driving support during the normal operation of the plant, the blade number of the fan was increased, which greatly reduced the vibration level of the heat exchanger.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2001.10b
• /
• pp.1075-1078
• /
• 2001

현재까지 게시판의 비속어 처리프로그램은 비속어를 발견하면 입력을 할 수 없도록 차단하는 차단식 프로그램이었다. 이런 프로그램은 사이버 상의 의사표현의 자유를 차단한다. 또한 어떤 단어의 경우는 비속어가 아닌데도 차단되어 입력을 원천봉쇄하기도 한다. 그래서 비속어를 차단하지 않고 처리해 주며 신생 비속어도 처리를 쉽게 해 주며 검출에 유연성을 제공하는 프로그램이 필요하다. 본 논문에서는 데이터베이스 상에서 구현된 게시판을 대상으로 비차단식, 유연성이 있는 비속어 추출 프로그램을 설계하고 구현하였다.

• Journal of Energy Engineering
• /
• v.11 no.3
• /
• pp.224-229
• /
• 2002

During the operation of Circulating Fluidized Bed Combustion Boiler, defluidization is mainly caused by the formation of clinker. The clinker is made of components of Si, Fe, Ca, etc. However, although the defluidization is widely researched, the major factor has not been validated yet clearly. In this study, in the view of the shape and the arrangement of nozzles at a distributor (type 1, type 2), the formation of clinker is examined by CFD calculations and an improved nozzle design is proposed.

• Clinics in Shoulder and Elbow
• /
• v.5 no.1
• /
• pp.23-28
• /
• 2002

Purpose Displaced lateral end fracture of clavicle and acromioclavicular dislocation type Ⅲ∼Ⅵ may be required surgical treatment. Material and Methods : From May 1998 to March 2001, we operated with Welter plate with minimal incision by one surgeon. Immediately, pendulum and passive exercise was initiated after surgery. The shoulder function was evaluated using UCLA score. Average follow up was on 28(12∼45) months. Results : All 11 patients were regained satisfactory function. Average UCLA score was 31.9(29~35) at last follow up. Conclusion . The merit of Welter plate fixation with minimal incision is simple technique, reduced surgical time, smaller scar than large plate, strong fixation, early exercise, reduced implant failure. The disadvantage is expensive, skin irritatatation by long hook. But Welter plate fixation with minimal incision is a good method of internal fixation and excellent clinical result in surgical treatment of type H displaced lateral end fracture of the clavicle and type Ⅲ∼Ⅵ acromioclavicular dislocation.

• Journal of Dental Rehabilitation and Applied Science
• /
• v.34 no.1
• /
• pp.56-62
• /
• 2018

When it comes to treat patient with loss of vestibule, conventional denture impression have limitation which can cause problems of excessive border extension. Suction denture with closed mouth technique which was introduced to solve this problem, forms negative pressure being sealed denture flanges by mobile mucosa when the patient swallows and chews. Also, it can decrease patient's visiting time by taking impression and gothic arch tracing at once. In this case, considering patient's chief complain which is a loose fit of present lower denture, suction dentures with closed mouth technique was planned.