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이상현,이상준,문경일,조성의 한국IT서비스학회 2009 한국IT서비스학회지 Vol.8 No.4
Objectifying claims filed during the warranty period, analyzing the current circumstances and improving on the problem in question is an activity worth doing that could reduce the likelihood of claims to occur, cut down on the costs, and enhance the corporate image of the manufacturer. Existing analyses of claims are confronted with two problems. First, you can’t precisely assess the risks of claims involved by means of the value of claims per 100 products alone. Second, even in a normal state, the existing approach fails to capture the probabilistic conflicts that escape the upper control limit of claims, thus leading to wrong control activities. 1 이상현·이상준·문경일·조성의 To solve the first problem, this paper proposed that a time series detection concept where the claim rate is monitored based on the date when problems are processed and a hazard function for expression of the claim rate be utilized. For the second problem, this paper designed a model whereby to define a normal state by making use of PID (Proportion, Integral, Differential) and infer by way of a fuzzy concept. This paper confirmed the validity and applicability of the proposed approach by applying methods suggested in the actual past data of warranty claims of a large-scaled automotive firm, unlike hypothetical simulation data, in order to apply them directly in industrial job sites, as well as making theoretical suggestions for analysis of claims.
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굴패각 및 산업 부산물을 재활용한 투수 콘크리트에 관한 기초 특성 연구
이상현,이상현,하상훈,어석홍 한국산업융합학회 2025 한국산업융합학회 논문집 Vol.28 No.1
In this paper, compressive strength, bending strength, slump, internal porosity, and permeability coefficient tests were conducted to analyze the basic characteristics of pervious concrete recycled from oyster shells and blast furnace slag fine powder and ferro-nickel slag which are industrial by-products. The compressive strength, internal porosity, and permeability coefficient were tested using 81 specimens of ∅100 × 200mm size. The slump test was conducted 18 times with divided into two parts, immediately after mixing and after 1 hour. As a result of the experiment, the effect of improving long-term strength according to the replacement ratio of blast furnace slag fine powder to the cement weight was small. And the compressive strength and bending strength showed a decrease depending on the replacement ratio of the oyster shell to the weight of fine aggregate, but the internal porosity and permeability coefficient showed an increase. Test results showed that permeable concrete recycled from oyster shells and industrial by-products met the Korea Public Procurement Service’s permeable concrete standards of basic properties and the Seoul Metropolitan Government’s permeable performance standards. Therefore, industrial by-products and oyster shells in permeable concrete can be an effective way to solve environmental problems and natural aggregate collection problems, but additional research on freeze-thaw resistance and economic feasibility is considered necessary.
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이상현,이철우,Yongjoo Jeong,Sihyoun Lim,Eun-Ah Lee,김건 한국전기화학회 2010 한국전기화학회지 Vol.13 No.1
The rechargeable Zn-air battery is considered as one of the potential candidates for the next generation secondary batteries due to its many advantages. However, its further applications and commercialization have been limited by the complexity of the reactions on air electrode which are oxygen reduction and evolution reactions (ORR/OER) upon discharging and charging processes, respectively. In the present study, lanthanum was impregnated into a commercial Pt/C gas diffusion electrode, and it clearly verified significantly enhanced cycling stability and reversibility. The results presented in this study show the possibility of repeated charge/discharge processes for Zn-air batteries with a La-loaded air electrode, and they demonstrate the potential as a promising next generation secondary battery.
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