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김봉주,이선봉,Kim, Bong-Ju,Lee, Seon-Bong 한국자동차안전학회 2020 자동차안전학회지 Vol.12 No.3
Currently, the second level of the six stages of self-driving technology, as defined by SAE, is commercialized, and the third level is preparing for commercialization. The purpose of ACC is to be evaluated as a system useful for preventing and preventing accidents by minimizing driver fatigue through longitudinal speed control and relative distance control of the vehicle. In this regard, for the study of safety assessment methods in the practical environment of ACC. Distance measurement method using monocular camera and data acquisition equipment such as DGPS are utilized. Based on the evaluation scenario considering the domestic road environment proposed by the preceding study, the relative distance obtained from equipment such as DPGS and the relative distance using a monocular camera in the actual test is verified by comparing and analyzing the safety assessment. The comparison by scenario results showed a minimum error rate of 3.83% in Scenario 1 and a maximum of 14.61% in Scenario 6. The cause of the maximum error is that the lane recognition is not accurate in the camera image and irregular operation conditions such as rushing in or exiting the surrounding area from the walkway. It is expected that safety evaluation using a monocular camera will be possible for other ADAS systems in the future.
네트워크 외부성이 있는 내구재의 독점시장에서 보상판매와 제품 호환성
김봉주 한국계량경제학회 2016 계량경제학보 Vol.27 No.3
This paper considers product differentiation in view of a mono-polist’s incentive to introduce a new version of his product over time when the monopolist can use trade-in programs in two-period model. Contrary to previous literature, we assume that the upgraded product, which is based on the existing product and forward compatible with the new product, can be provided in the second period. The above assumption reflects on the coexistence of new and upgrade products in the real marketplace. Moreover, we assume that the new product can be either an improved product or a downgraded product compared to the product provided in the first period. The following conclusions come from these assumptions: In case of the improved product, trade-in programs can increase social welfare. However, in case of the downgraded product, trade-in programs can lead to reduced social welfare, which could be avoided by prohibiting them. 이 연구는 두 기간 모형에서 독점기업이 보상판매를 사용할 수 있을 때, 동태적으로 그기업이 신제품을 도입할 유인이라는 측면에서 제품차별화를 다룬다. 이전의 연구들과달리, 기존의 제품에 기반하고 신제품과 상방 호환성(forward compatibility)을 가진개량제품이 제2기에 제공될 수 있다고 가정한다. 이 가정은 현실에서 신제품과 개량제품이 공존하는 현실을 반영한 것이다. 또한 신제품은 제1기에 제공되는 제품에 비해 품질이 개선될 수 있지만 품질이 저하될 수도 있다고 가정한다. 이러한 가정에서 우리는 다음의 결론을 얻었다. 먼저 신제품이 품질이 개선되는 경우, 보상판매는 사회후생을 개선할 수 있다. 하지만 신제품의 품질이 저하되는 경우에 보상판매는 오히려 사회후생의 감소를 초래할 수 있다.
김봉주,조남주 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Recently the polar regions are getting a lot of attention, because many countries are interested in the resource development and carving out north pole route. So the demand for polar ship is gradually increasing. However the study on antifouling paint both with good fouling release property and mechanical property applicable to polar ship is not enough yet. Antifouling paint has been developed to prevent the adhesion of fouling organisms. One of the effective ways for antifouling is to coat the immersed surface with paints having fouling release property. In this study, poly(dimethylsiloxane)(PDMS)-block-polyurethane(PU)-block-poly(dimethylsiloxane) triblock copolymers were synthesized as an antifouling paint resin applicable to polar ship by addition polymerization. In result, PDMS-b-PU-b-PDMS triblock copolymers were successfully synthesized and they showed the proper fouling release property and mechanical property as antifouling paint resins.
염소-차아염소산을 이용한 폐 컴퓨터 CPU Chip 함유 금의 용출 특성
김봉주,박천영,조강희,최낙철 한국자원공학회 2012 한국자원공학회지 Vol.49 No.6
The objective of this study was to optimize the Au⋅Ag extraction from CPU of abandoned computer using chloride solvent (Chlorine - hypochlorous acid). Batch experiments were conducted under various experimental conditions to examine Au⋅Ag extraction with hydrochloric acid – hypochlorite. Results showed that the extraction of Au⋅Ag by hydrochloric acid - hypochlorite was a fast process, reaching equilibrium (maximum extraction) within 30 min. The Au⋅Ag maximum extraction of 67.84% and 68.20 were investigated under hydrochloric acid to hypochlorite ratio with a 1:1. The influence of NaCl concentration and temperature on Au⋅Ag extraction were significant due to their increase in oxidation potential and solubility of extraction solutions. This study demonstrated that hydrochloric acid - hypochlorite could be applied as solvents for Au⋅Ag recovery in resources resource recovery of an urban mine. 본 연구의 목적은 염산-차아염소산 용매제를 이용하여 폐 CPU내 Au⋅Ag의 용출 최적화이다. 염산-차아염소산 나트륨 용액을 이용한 Au⋅Ag 용출을 관찰하기 위하여 다양한 실험조건에서 회분실험을 실시하였다. 실험결과, 염산-차아염소산 용매제에 의한 Au⋅Ag의 용출은 빠른 반응으로써, 30분 안에 평형(최대용출)에 도달하였다. 염산-차아염소산 나트륨의 Au 용출율은 67.84%이며, Ag는 68.20% 이었다. NaCl의 농도와 반응온도는 Au⋅Ag 용출에 영향을 미쳤는데, 이들 인자들은 용출액의 산화력과 용해도를 증가시켰기 때문이다. 본 연구에 의하면, 염산-차아염소산 나트륨 용액은 용매제로써 도시광산의 자원회수 과정에서 Au⋅Ag 회수에 적용될수 있을 것으로 판단된다.