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AISI D2강 위에 다층으로 증착된 WC-Ti_(1-X)Al_(X)N 코팅의 국부부식 거동에 관한 연구
안승호,이정호,김호건,김정구,한전건 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9
Multilayered WC-Ti_(1-x)Al_(x)N coatings are characterized by periodically repeated structures of lamellae of WC-Ti/WC-Ti_(1-x)Al_(x)N. WC-Ti_(1-x)Al_(x)N coatings of changing Al concentration were deposited on AISI D2 steel by high-ionization sputtered plasma vapor deposition (PVD). The Al concentration could be controlled by using evaporation source for Al and fixing the evaporating rate of other metals. Four kinds of WC-Ti_(1-x)Al_(x)N coatings were prepared: WC-Ti_(0.6)Al_(0.4)N, WC-Ti_(0.53)Al_(0.47)N, WC-Ti_(0.5)Al_(0.5)N and WC-Ti_(0.43)Al_(0.57)N. The corrosion behavior of WC-Ti_(1-x)Al_(x)N coatings was investigated using electrochemical techniques in deaerated 3.5% NaCl electrolyte (galvanic corrosion test, potentiodynamic polarization test, electrochemical impedance spectroscopy and Mott-Schottky method) and surface analyses (GDOES, SEM and EDS). Particular attention was paid to the effect of growth defects on the coating properties related to the corrosion behavior. The results of the coating and substrate galvanic corrosion test showed low galvanic current densities. In the potentiodynamic polarization test and EIS measurement, the corrosion current density of WC-Ti_(0.5)Al_(0.5)N was lower than others and presented higher R_(ct) values than others after 240 h immersion time. This could be attributed to the formation of a Ti oxide, which promotes partial closing of the defects. Capacitance values obtained from EIS as a function of different potentials (C^(-2) vs E) showed that the oxide layer exhibited an n-type semiconductor behavior.
한성일,이상영,박민수,정호근 한국농업정책학회, 한국축산경영학회 2001 농업경영정책연구 Vol.28 No.1
This article applies Hedonic price theory to estimate the attribute prices of beef. Result shows that the difference between attribute prices is dependent upon breed, quality attributes, quantity attributes in order. This indicates that current wholesale pricing reflects the grading standards very well. Also, under current beef grading system, the attribute prices clearly reflect changes in the attribute level of beef. For each farmer, quality differentiation strategy is to make a decision on which attribute level is possibly improved given breeding technology. Thus, to produce higher value-added, farmers should be able to consider their management skills from every angles prior to quality differentiation.
태권도 옆차기 동작의 우수자와 비우수자간의 운동학적 비교 분석
이호진,한재희,김륜건,홍예은,우상연 순천향대학교 기초과학연구소 2022 순천향자연과학연구 논문집 Vol.28 No.1,2
The purposes of this study were to analyze the kinematic variations between skilled and unskilled individuals and obtain the data needed to improve effective side kick skill in Teakwondo. We used a video analysis program to collect performance time, changes in movement of the center of the body, angle, and angular velocity. The results were as follows : 1) in unskilled cases, side kick motion occurred for more time than in unskilled cases, 2) to make a stronger kick, the skilled group increased the joint speed of the legs and unskilled athletes have smaller angles than experienced athletes. As a result, the total performance time of side kicks was shorter for skilled people and was consistent with other previous studies. The angle of the knee joint and hip joint had a great influence on the side kick.The range of motion of the hip and knee joints should be increased so that the desired hitting point can be quickly reached.
김곤호,김건우,김영우,최영도,김종식,김상진,한승희,홍문표 漢陽大學校 工學技術硏究所 1998 工學技術論文集 Vol.7 No.1
Abstract- In a plasma source ion implantation, the target is successively biased by negative voltage pulses with an intrinsic finite rise time, resulting in the time-dependent sheath formation around the target. Measurement of time-dependent sheath during the pulse rise show the ion matrix sheath development which is in proportion to square root of time and pulse rise rate over plasma density but independent of the ion mass.
흰쥐의 Adjuvant 유발 다발성 관절염에 대한 마황 약침의 치료 효과
이한창,염미정,김건호,심인섭,최강덕,이혜정,함대현 대한동의생리학회,대한동의병리학회 2003 동의생리병리학회지 Vol.17 No.2
The current studies investigated the therapeutic effects of Ephedra sinica Stapf (ES) herb-acupuncture on the inflammatory responses of rat arthritic joint, which was induced by the intradermal injection of heat-killed Mycobacterium tuberculosis emulsified in squalene to the base of the tail. The measurements of body weight and articular index were exploited as the assessment methods addressing arthritic symptoms, and the expression profiles of cytokines such as TNF-α, IL-1β and IL-6 in the, rat joint were analyzed using RT-PCR. The articular indexes of arthritic rats were significantly restored after the treatment with ES herb-acupuncture. Although the clinical symptoms of arthritic rats were apparently alleviated by the ES treatments, their body weights were not recovered. It maybe due to the weight-loss and energy enhancement effects of ES extracts. The expression of TNF-α, IL-1β and IL-6 enes, which were highly stimulated in the knee joints of arthritic rats, were restored to the levels of normal rats after the ES treatment. The therapeutic effect of ES herb-acupuncture was not observed in ES-treated, non-acupoint arthritic group as a sham control. The ES herb-acupuncture into an acupoint ST36 was found to be effective in alleviating the arthritic symptoms in adjuvant-induced arthritis rats as regards the body weight, joint appearance and the expression profiles of inflammatory cytokines.
Ni-Zn Ferrite/Rubber복합형 전파흡수체의 정합조건 설계
김한근,사공건,신광호 東亞大學校 1994 東亞論叢 Vol.31 No.1
The demands for microwave absorbing materials and designs are being increased. We have studied about a new design technique to seek for the matching conditions for composite absorbers. The ferrite/rubber composite microwave absorbers were fabricated with Ni-Zn ferrite prepared by coprzcipitation method and silicone rubber. We have figured out the matching conditions(frequency and thickness) through the material constants of the self-maded ferrite/rubber composite absorber by utilizing the matching map and the matching boundary map. We could make a prediction for the matching conditions of ferrite/rubber composite absorber with our developed design technique.
Malachite Green유도체의 합성과 그 항균성에 관한 연구
金浩植,金鍾大,金在根,韓文洙 嶺南大學校附設 基礎科學硏究所 1986 基礎科學硏究 Vol.6 No.-
Malachite Green derivative bearing butyl group was prepared in the form of Leuco base, 4-butyl-4'. 4"-bis(dimethylamino) triphenylmethane, by the condensation reaction of N,N-dimethylaniline with the formyl derivative of butylbenzene, which had been obtained from butylbenzene by chlormethylation followed by oxidation. The butylbenzene was prepared by the alkylation reaction of benzene with n-butyl choride which had been obtained from n-butyl alcohol and zinc chloride. The antimicrobial and antifungal activity of buty-Malachite Green was evaluated in terms of minimum inhibitory concentration by the dilution method. The butyl-Malachite Green showed considerably increasing activity. This activity was stronger than that of hexyl-Malachite Green. This phenomenon suggested that the activities of the alkyl derivatives increase with decrease in the number of carbon in the alkyl group.
김항석,신건호,한영희 군산대학교 지역개발연구소 1999 地域開發硏究 Vol.11 No.-
Customer service marketing has been well developed in business since last several decades. The purpose of this research is to apply service orientation in hospitals. The specific purposes are as follows. First, The process of customer service in business includes medical service delivery, which will be a competitive strategy for the 21st century. Second, more specifically, the degree of customer satisfaction will be explored based on data collected and analysed by questionnaire survey. Third, customer service strategy of small-medium sized hospitals will be presented based on the findings of this research. For the successful completion of the research, the established theories in customer service will be reviewed and questionnaire technique will be adopted to collect data. The following finding indicate some general strategies for better medical service delivery in small and medium sized hospitals. First, finding show the punctuality of service employees and immediate notice of examination results are most preferred elements in service delivery. Second, the study also pointed out the kindness of employees in hospitals need to provide free medical program for the community residents. In conclusion, the research showed some critical issues in hospital management. In humane treatment and kindness of employees are the most chronic problems among many others. The research also indicated give a competitive advantage to small and medium sized hospitals for better service delivery.