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류장렬(Jang-Ryeol Ryu),박종현(Jong-Hyun Park),양진규(Jin-Kyu Yang) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.7
LEDs have several merits such as low power consumption, long lifespan, high brightness, fast response, and eco-friendliness. In order for LEDs to be used in many fields, they need to have high integration of LED chips, good radiance, and good photometric distribution. In this research, we have produced UV LED illuminator that inspects the flatness and uniformity of the bond through a fluorescent material within the adhesive in the coating process of the industrial products. Since UV rays with the wavelength of 315~400 nm react to fluorescent materials in the adhesive, they are used to examine the coating condition of the adhesive. We decided an optimal wavelength of the UV rays which definitely react to even a small amount of the fluorescent material, and aimed to make the direction angle of the illuminator to be less than 30° in order for the UV rays not to reach the body of the worker. Since the proposed UV LED illuminator showed the power consumption of 20.4W, luminous flux 11.9lm, direction angle of 27° and UV output power of 3.2W for the input voltage of 220V, we are sure that it is suitable for the flaw detection in the manufacturing process of shoes and so on.
이중기계적 합금화법에 의한 초미세 Al-Ti 합금의 제조 및 기계적 성질
권숙인,변재원,양진규 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.7
Dispersion strengthened Al-Ti alloys with very fine microstructures were fabricated by double mechanical alloying (DMA) process, and the elevated temperature mechanical properties of these alloys were investigated. The alloys prepared by DMA process represented better distribution and smaller size of precipitates than those by single mechanical alloying(SMA) process. The analysis of XRD and TEM observation indicated that the size of Al₃Ti phase was smaller than 30 ㎚. The lattice parameter of Al was decreased from 4.0485 to 4.0401Å during MA, which indicates the dissolving of Ti into Al matrix. In this study, the maximum solid solubility of Ti during MA was estimated to be 8.82 wt%. Inspite of effective dispersion of intermetallic compound by DMA process, the alloys did not show improved mechanical properties as expected, due to too high volume percentage of intermetallic dispersoids.
서부 경남 일부 도장 작업장 근로자의 톨루엔 노출에 의한 건강 위해성 평가
이효민,최은석,홍대용,김장락,양진규,강민정,강문국,최우호,권덕헌,조미정 한국보건통계학회 2000 보건정보통계학회지 Vol.25 No.2
This study was performed to assess the health risk of toluene expected in painting workplace. The subjects were 87 workers of 43 painting workplaces in western Kyongnam Province. They were monitored through personal air samplers during working time and the samples were analyzed by gas chromatography. Subchronic daily intake of toluene was induced using Monte-Carlo simulation. For the settlement of exposure variables, exposure time, exposure frequency and inhalation rate were establiched to 8 hours per day, 280 days per year and 20 m'/day, respectively. The air concentration of toluene, inhalation rate and body weight were used in the form of distribution values to calculate subchronic daily intake of toluene. The reference dose of toluene was induced using toxicity value from Integrated risk information system (IRIS) database. For risk characterization, Monte-Carlo simulation was used for the induction of subchronic hazard index. The results of risk assessment were summarized as follows: Ⅰ. The air concentration of toluene was 39.313 ± 83.178 mg/m^3(mean ± standard deviation) ranging from 0.060 mg/m^3 to 444.108 mg/m^3. Among 87 subjects, only one exceeded threshold limit value(TLV-TWA). Ⅱ. Subchronic daily intake of 25th and 50th percentile on toluene simulated by Monte-Carlo simulation were 0.13 mg/kg-day, 0.54 mg/kg-day, respectively. Ⅲ. Inhalation reference dose of toluene was 0.13 mg/kg-day. Ⅳ. Subchronic hazard index of 25th and 50th percentile on toluene simulated by Monte-Carlo simulation was 1.17, 2.69, respectively. Adverse health effects of toluene to 65% of the workers would be expected in the selected painting workplaces because the hazard index of 35th percentile exceeded 1. So, we should not conclude there were no adverse health effects if it didn't exceed TLV-TWA