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高載乾 제주대학교 1984 논문집 Vol.18 No.2
The objective of maintenance is to keep equipment and other assets in the condition that will best facilitate organization goals. Maintenance is intented to improve the reliability of such physical assets as machines, materials handling equipment, or comuters and the safety of buildings and other facilities. A considerable amount of study in this area has led to the development of both practical and theoretical models that can be used to formulate maintenance policies. The maintenance function may be considered as a second production system operating in parallel with the firm's manufacturing system. That is, in maintenance, as in direct productive activities, work must be scheduled, inventories of spare parts maintained, prescribed quality standards met, and labor standards and wage payment systems established. Preventive maintenance consists of prior inspections and servicing whereas break down maintenance is often concerned with emergency repairs following some type of failure. The optimal time and level of preventive maintenance is decided by making a trade off between preventive maintenance and corrective maintenance costs. Finding this optimum is often a complex task because the probable breakdown time for various parts of pieces of equipment must be known, the repair times must be known, and-if maintenance and personal resources are limited-maintenance priorities among machines and among departments must be determined. In many Japanese manufacturing comp3nies, the effectiveness and efficiency of plant and equipments is improved by TPM system, which is contributed to the improvement of reliability and maintenability of production system. These days, a high level of production system and automation necessitates urgently total member-participated PM system. The situation and problems of maintenance system in Korea firms since 1980s is presented: (a) The superannuation and commonplace of the facilities and equipments (b) The shortage of the vigorous introduction of preventive maintenance (c) The low productivity by the growth of failure frequent of equipments (d) The problems for maintenance engineering in the automation of production system The three improving for these problems is also proposed: (a) The failure analysis and the setting-up of effective counter plan (b) The establishment of total member-participated maintenance system (c) The positive introduction and settlement of the productive maintenance system
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오재근,최기영,송재흥,김영국,채건식,주유환,설정식,손인호,차성극,이상찬 慶南大學校 附設 基礎科學硏究所 1996 硏究論文集 Vol.8 No.-
HClO₄(pH:2) 수용액에서 양극산화 방법으로 HgMnTe(HMT)의 표면에 산화막을 형성 시켰다. 산화막의 두께는 SEM으로 측정하였으며 10㎛였다. 전류-전압 특성곡선을 얻어 산화 피크 전압으로부터 HTeO₂?, TeO?, HHgO₂? 막이 형성되었음을 알 수 있었다. 산화시키지 않은 HMT와 HClO₄수용액에서 산화시킨 HMT에 대해 Hall전압 및 자기저항을 각각 측정하였다. 홀전압과 자기저항은 HMT보다 HMT산화막에서 더 컸으며 이것은 HHgO₂? 공격자가 홀의 역할을 하고, TeO₄? 산화막은 전하의 포획도를 낮게하기 때문으로 생각할 수 있다. Anodic oxidation processes on HgMnTe surface has been studied in standard aqueous HClO₄(pH:2) solution. The 10㎛ thickness of the anodic oxide layers was measured by SEM. The Composition of the anodic oxide layers are evaluated from current-voltage(I-V) characteristic of HgMnTe Oxidation. The layers are composed of mixed oxide. ??, TeO₄, and?? in HClO₄solution. Transport properties have been investigated in HMT oxide layer made in HClO₄solution and virgin HMT samples at 300K. Hall voltage and magnetoresistance are greater in oxide layer HMT than virgin HMT. As a result, we know that the vacancy of ??in an anodic oxide layer acts as hole and the resulting oxide ?? layer exhibit a reduced degree of charge trapping and increase magnetoresistance.
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류재호,노규태,이영석,이영호,권혁찬,김재석,김효진,이영민,박혜원,박근희 대한조혈모세포이식학회 2002 대한조혈모세포이식학회지 Vol.7 No.1
연구배경: 동일한 환자를 대상으로 조혈모세포이식 전 일반 병실에서의 관해유도 항암제치료 및 강화요법으로 인한 호중구감소 기간의 감염양상과 고용량 항암제치료 후 무균실에서의 조혈모세포이식 시 호중구감소 기간의 감염양상을 중심정맥관 관련 패혈증을 중심으로 비교 연구함으로써 효율적인 감염관리지침을 마련하고자 하였다. 대상 및 방법: 1999년 1월부터 2001년 7월까지 2년 7개월간 동아대학교병원 일반병실에서 악성혈액질환으로 항암제 치료를 받다가 조혈모세포이식을 시행받았던 22명을 대상으로 중심정맥관 관련 패혈증의 형태를 비교분석하였다. 결과: 대상 환자들의 일반병실과 무균실에서의 입원기간은 각각 32±13일, 33±19일, 호중구 감소기간은 15±12일, 17±18일, 호중구 감소기간의 발열 횟수는 14회, 14회로서 입원병실의 종류에 따른 차이는 없었다. 환자들의 중심정맥관 사용일수는 일반병실에서 29일(7~545일), 무균실에서 100.5일(25~606일)이었으며, 총 사용일수는 각각 1,515일, 3,250일로서 무균실에서의 중심정맥관 사용일수가 의미 있게 길었다(P=0.001). 중심정맥관 사용 일수에 대한 감염률은 각각 5.28/1,000일, 3.08/1,000일로서 일반병실에서 그 빈도가 높았으나 통계적 유의성은 보이지 않았다(P=0.141). 결론: 중심정맥관 삽입 후 일반병실에서 항암제 치료를 받던 환자가 조혈모세포이식을 위하여 무균실에 입원하는 경우, 중심정맥관을 교체하는 것이 감염관리를 위하여 바람직할 것으로 생각된다. Background: We compared the incidence of central venous catheter (CVC) related septicemia during neutropenic period in the same patient, which developed following chemotherapy for remission induction and consolidation, or hematopoietic stem cell transplantation (HSCT). Methods: We retrospectively reviewed the medical records and laboratory data of 22 patients with hematologic malignancies who received anticancer chemotherapy followed by HSCT at Dong-A University Hospital between January, 1999 and July, 2001. We investigated the duration of hospitalization, duration of neutropenic period, duration of catheterization, microbiologically documented organisms and incidence of CVC related septicemia. Results: The data in general ward (before HSCT) and laminar air flow room (after HSCT) were as follows: duration of hospitalization was 32±13 days and 33±19 days, duration of neutropenic period was 15±12 days and 17±18 days, median duration of catheterization was 29 days (7~545 days) and 100.5 days (25~606 days) (P=0.001), and incidence of CVC related septicemia was 5.28/1000 days and 3.08/1000 days, respectively. In the CVC related septicemia, the most common etiologic organism was coagulase negative staphylococcus. Conclusion: We suggest that the exchange of CVC before admission to laminar air flow room could decrease the incidence of CVC related septicemia in HSCT recipients.
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Silicone처리 纖維에 관한 硏究 : 水酸基를 갖고 있는 纖維의 개질을 중심으로
梁在乾,韓貞璉,姜斗煥 단국대학교 1980 論文集 Vol.14 No.-
The reactivity of hydroxyl group on PVA film, cotton, and silk with alkoxysilane and acetoxysilane was investigated. The reactivity of hydroxyl group on PVA film was increased in the order of Q_m>T_m>D_m and Q_a>T_a>D_a, and the complex treating agents such as D_m/T_m, D_m/O_m, D_a/T_a, D_a/Q_a to cotton and silk fabrics had superior effect to the simple one, such as D_m, T_m, Q_m, D_a, T_a, Q_a. Silicone contents per square centimeter of sample which has water repellency was 0.1㎎ above in PVA film, and 0.2㎎ above in the fabrics. The reaction was completly carried out under the 150∼170℃.
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梁在乾,韓貞璉,姜斗煥 단국대학교 1978 論文集 Vol.12 No.-
Methyl chloride was synthesized by using the continuous circulation reactor which developed in the Institute of Organo Silicone Compound (ofDAN Kook University), Especially, the experiment was carried out to increase the yield of dimethyl dichloro silane. Metalic silicon crushed to 100 mesh, copper powder <200∼200mech> as catalyst, and, Ni, pb, Mn, Zn, Ca, Al, as auxiliary were mixed, and the amount of catalyst was used 10∼20% in comparison to the metalic silicon. Methyl chloride preheated to 260℃ was supplied to the bottom of the reactor after dried. completely The temperature of the reaction was controlled to 300±10℃ and the pressure in the reactor was 1∼2atm. The yield of dimethyl dichloro silane was good, when the 1st conversion of methyl chloride was less than 58%, and the small amount of the group Ⅰ.Ⅱ. element as auxiliary catalyst was added. The yield of the dimethyl dichloro sllane experimented by the condition was 83%.
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