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.

語義變化의 限界

金鳳柱 한국중앙영어영문학회 1974 영어영문학연구 Vol.8 No.1

Pitressin이 토끼 콩팥 조직 조각의 산소 소비량과 수분 이동에 미치는 영향

김봉주,차영선 우석대학교 의과대학 1969 우석의대잡지 Vol.6 No.1

The present experiments were designed to examine in rabbit kidney cortex and inner medulla slices, the responses to oxygen consumption and weight changes ta osmotic gradients, in the presence and absence of ions, as affected by pitressin and by adenosine-triphosphate. The osmolality of medium was altered by changing the concentration of NaCl in the Krebs-Ringer bicarbouate solution, and the NaCl was replaced with urea. The incubation was carried out for a period of 10 and 90 minutes at 38℃ in 100% oxygen gas phase. The final concentration was 140mM of pitressin, 7.5mM of adenosine triphosphate. The data denote that; 1. There was a steady decrease in the rate of weight gain as greater osmolar concentration of NaCl Krebs-Ringer bicarbonate medium. 2. In an attempt to see whether the effects were due to Nacl or not, experiments were done using urea. When NaCl was replaced by urea of various concentrations, there was also a decrease in the weight gain which was proportional to the concentration of tile outside urea solution. 3. After addition of pitressin, when non-ionic solutes were used in the bathing fluid, the rate of weight gain across the tubule of the rabbit kidney cortex was enhanced but was still related to tile osmotic gradient. 4. Compared with NaCl solution, urea solution induced weight gain and decreased oxygen consumption. 5. Oxygen consumption of cortex and inner medulla slices were decreased by pitressin addition, but inner medulla in hypotonic saline medium and cortex in hypotonic urea medium showed the increase of oxygen consumption. 6. In the ATP medium, weight of cortex and inner medulla was increased except cortex in isotonic medium that showed no weight changes and inner medulla that showed weight gain in hypertonic medium. 7. In the ATP medium, pitressin inhibited the oxygen consumption of cortex and enhanced that of inner medulla. 8. Effect of pitressin was great in cortex of hypertonic medium and in inner medulla of hypotonic medium. 9. Oxygen consumption of control group was great in isotonic medium and of pitressin group in hypotonic medium.

국제어 제정의 방법과 실제

김봉주 충남대학교 어학연구소 1992 언어 Vol.13 No.-

자동착륙을 위한 횡운동 설계기법 연구

김봉주,하철근 한국항공우주학회 2002 한국항공우주학회 학술발표회 논문집 Vol.- No.-

소형 무인헬리콥터의 파라미터 ID 모델링

김봉주,김성필,김응태 한국항공우주학회 2005 한국항공우주학회 학술발표회 논문집 Vol.- No.-

실도로에서의 ACC 기능에 대한 시뮬레이션과 실차시험 비교 평가

김봉주,이선봉 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.1

Increasing environmental concerns have prompted countries around the world to tighten regulations on greenhouse gases and fuel efficiency. Research is being done using advanced driver assistance systems to improve fuel economy and for the convenience of drivers. Research on systems such as adaptive cruise control (ACC), LKAS, and AEB is active. The purpose of ACC is to control the longitudinal speed and distance of the vehicle and minimize the driver's load, which is considered useful for accident prevention. From this point of view, research has used a mathematical method of safety evaluation as a function of distances and scenarios while considering domestic road environments. A vehicle is tested with a simulation in a proposed scenario. The purpose of the analysis is to verify the functional safety of ACC by comparing the theoretical calculations using theoretical equations, the relative distances in the simulation, and an actual vehicle test. These methods are expected to enable many companies to use scenarios, formulas, and simulations as safety verification methods in the development of ACC. 세계적으로 환경문제에 관한 우려가 급증하여, 세계 각국이 온실가스 연비 규제를 강화하고 있다. 연비향상을 위해 첨단 운전자 지원 시스템을 이용한 연구를 통하여, 운전자의 편의를 위해 다양한 첨단 운전자 지원 시스템을 개발하고 있다. 그중 ACC, LKAS, AEB 등의 시스템에 대한 연구가 활발하다. ACC의 목적은 차량의 종 방향 속도와 거리를 제어하고 운전자의 부하를 최소화하여 사고 예방과 방지에 유용한 시스템으로 평가되고 있다. 이러한 관점에서 본 논문은 선행연구에서 제안한 국내도로 환경을 고려한 시나리오와 거리에 대한 함수로 안전성을 평가할 수 있는 수학적 방법을 활용한다. 또한, 제안한 시나리오를 기반으로 시뮬레이션과 실도로 실차시험을 진행한 뒤, 이론수식을 활용한 이론 계산값, 시뮬레이션과 실도로 실차시험의 상대거리의 비교분석을 통하여 ACC의 기능적인 안전성을 검증하고자 한다. 이러한 방법을 통하여 많은 회사들이 ACC의 개발 단계에서 시나리오, 수식, 시뮬레이션을 활용하여 안전성 평가방법으로 활용할 수 있을 것으로 예상된다.

주관절 척골신경병증에서 병변 국속화를 위한 신경전도검사

김봉주,김동휘,이지훈,박병규 대한근전도전기진단의학회 2012 대한근전도 전기진단의학회지 Vol.14 No.2

Objectives: To compare abductor digiti minimi (ADM) recording with first dorsal interosseous (FDI) recording for the localization of ulnar neuropathy at the elbow (UNE) with electrodiagnostic study and inching test. Methods: Eighty-seven hands with UNE were collected. Compound muscle action potentials were recorded from both ADM and FDI muscles and ulnar nerve was stimulated at the wrist, 3 cm distal and 7 cm proximal to the medial epicondyle. One cm short segment study of ulnar nerve was performed from 4cm distal to 3 cm proximal to the medial epicondyle by inching test. Results: UNE was diagnosed in 83 out of 87 hands with ADM recording and 84 out of 87 hands with FDI recording. Seven hands had nonconcordant abnormal findings along the recording site. In the inching test, 12 hands were not localized and 12 hands was localized with only one muscle recording. 48 hands showed same localization and 15 hands showed different localization with both ADM and FDI recordings. Conclusion: Since the result can differ according to the location of the recording electrode, motor conduction study and inching test of ulnar nerve should include recording from both ADM and FDI muscles.

듀얼카메라를 활용한 ACC 안전성 평가 방법에 관한 연구

김봉주,이선봉 사단법인 한국자동차안전학회 2022 자동차안전학회지 Vol.14 No.2

Recently, as interest in self-driving cars has increased worldwide, research and development on the Advanced Driver Assist System is actively underway. Among them, the purpose of Adaptive Cruise Control (ACC) is to minimize the driver’s driving fatigue through the control of the vehicle’s longitudinal speed and relative distance. In this study, for the research of the ACC test in the real environment, the real-road test was conducted based on domestic-road test scenario proposed in preceding study, considering ISO 15622 test method. In this case, the distance measurement method using the dual camera was verified by comparing and analyzing the result of using the dual camera and the result of using the measurement equipment. As a result of the comparison, two results could be derived. First, the relative distance after stabilizing the ACC was compared. As a result of the comparison, it was found that the minimum error rate was 0.251% in the first test of scenario 8 and the maximum error rate was 4.202% in the third test of scenario 9. Second, the result of the same time was compared. As a result of the comparison, it was found that the minimum error rate was 0.000% in the second test of scenario 10 and the maximum error rate was 9.945% in the second test of scenario 1. However, the average error rate for all scenarios was within 3%. It was determined that the representative cause of the maximum error occurred in the dual camera installed in the test vehicle. There were problems such as shaking caused by road surface vibration and air resistance during driving, changes in ambient brightness, and the process of focusing the video. Accordingly, it was determined that the result of calculating the distance to the preceding vehicle in the image where the problem occurred was incorrect. In the development stage of ADAS such as ACC, it is judged that only dual cameras can reduce the cost burden according to the above derivation of test results.

Hamlet 解釋 및 批評

金鳳柱 한국중앙영어영문학회 1968 영어영문학연구 Vol.1 No.1