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RISS 인기검색어
- 검색키워드
- 저자 : 정해전 ( Hae Jeon Jeong ) (검색결과 3 건)
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수돗물의 전기분해에 의해서 생성된 알카리수의 pH가 SS 400강의 부식특성에 미치는 영향
문경만(Kyung-Man Moon),류해전(Hae-Jeon Ryoo),김윤해(Yun-Hae Kim),정재현(Jae-Hyun Jeong),백태실(Tae-Sil Baek) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.3
Many rivers and seas have been affected by environmental contamination. Therefore, city water supplies often require a high-degree purification treatment to provide safe drinking water. However, in order to achieve a high-degree purification treatment, a large amount of chlorine has to be added to sterilize city drinking water. The added chlorine reacts chemically with water and forms hypochlorous and chlorine ions. The hypochlorous ionizes with hypochlorous ions and hydrogen ions. As a result, the city water contains a large amount of chlorine ion. As such, when city water is used with domestic boilers, many kinds of heat exchangers, and the engines of vehicle and ships, there are often corrosion problems. In this study, alkali water was electrochemically made by electrolysis of city water, and corrosion properties between alkali and city water were investigated with an electrochemical method. Most of the chlorine ions are thought to not be contained in the alkali water because the alkali water is created in the cathodic chamber with an electrolysis process. In other words, the chlorine ion can be mostly removed by its migration from a cathodic chamber to an anodic chamber. Moreover, the alkali water also contains a large amount of hydroxide ion. The alkali water indicated relatively good corrosion resistance compared to the city water and the city water exhibited a local corrosion pattern due to the chlorine ion created by a high-degree purification treatment. In contrast, the alkali water showed a general corrosion pattern. Consequently, alkali water can be used with cooling water to inhibit local corrosion by chlorine ions in domestic boilers, various heat exchangers and the engine of ships and for structural steel in a marine structure.
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박주태 ( Joo Tae Park ),신영식 ( Young Shik Shin ),정해전 ( Hae Jeon Jeong ) 대한류마티스학회 1994 대한류마티스학회지 Vol.1 No.2
The elbow joints are often involved in rheumatoid arthritis but it has been suggested that such as involvement is not commonly a major cause of disability in upper limb. To study the result of synovectomy of elbow in rheumatoid arthritis, synovectomy was performed in 16 elbows an 15 patient from March 1990 to April 1933 Average follow-up was 17. 1 months. The results obtained from this study are as follows; 1. Synovectomy of the elbow affected by rheumatoid arthritis is a good procedure even in the presence of advanced radiological changes. 2. All patient are satisfactory results of relief of pain and motion. 3. Although the follow-up in this series are short, averaging 17.1 months, the results see to be maintained. 4. Synovectomy of the elbow may be performed either as an early or as a late procedure with expectation of a useful result. Synovectomy of elbow in rheumatoid arthritis is one of a good treatment if the patient is selected properly.
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척추전방 전위증에서 TSRH 기기를 이용한 후측방고정술의 임상적 효과
박주태,신영식,김형근,정해전 대한척추외과학회 1994 대한척추외과학회지 Vol.1 No.2
The management of spondylolisthesis is difficult problem. Some authers advise a nonsurgical policy with a regular clinical review. Srugery would then be advised only if the diformity and pain increase or if a neurologic deficti develops. Fusions after reduction of the deformity would seem to give a chance of better result as the mechanisms of the lumbosacral junction restored to a more stable situation. A retrospective study was undertaken of the effects of posterolateral spinal fusion using TSRH in 42 patients with spondylolisthesis at Pohang St. Mary's Hospital from January 1991 to March 1993. The results are as follows; 1.The age of patients was from 23 to 66 and average 47.8 years old. Among them male were 8 and female were 34 cases. 2.The causes were digenerative(24 cases), spondylolytic(13% cases), taumatic(4 cases) and other cases(1 cases). 3.The reduction was done at Grade ⅠandⅡ spondylolisthesis, reduction rate was 71%. 4.The solid fusion was achieved at 38 cases. 5.There were two casses of pseudoarthrosis with screw breakage 6.The function results by Kirkaldy-Will were as follows; excellent 19 cases, good 14 cases, fair 8 cases and 1 poor case.
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