마이크로웨이브를 이용한 금정광 내 금 용출 효율 증가 기작

김봉주,권장순,고용권,박천영,Kim, Bong-Ju,Kwon, Jang-Soon,Koh, Yong-Kwon,Park, Cheon-Young 대한자원환경지질학회 2020 자원환경지질 Vol.53 No.2

본 연구에서는 금정광내 금회수율을 증진하고자 마이크로웨이브 전처리방법을 이용하여 티오요소용출 실험을 수행하였다. 이에 본 연구에서는 먼저 마이크로웨이브를 이용하여 금정광 시료 내 황철석의 분해에 따른 광물상 변화를 관찰하였다. 마이크로웨이브의 조사시간이 증가함에 따라 시료의 온도는 증가하였고, 황철석 내 S가 SO₂로 변환되어 시료 내 S의 함량이 감소되었다. X-선 회절분석 및 주사전자현미경 에너지 분산 분광분석을 통해 황철석은 자류철석과 적철석으로 변환되었으며, 미세균열이 발달된 다공질의 형태로 변질되었음을 확인할 수 있었다. 다양한 조건의 티오요소 혼합 용매를 이용하여 시료의 광물상변화에 따른 금 용출효율을 측정한 결과, 마이크로웨이브 조사시간 증가 및 용출실험 조건 내 용매의 농도 증가에 따라 용출효율이 증가하였다. 결론적으로, 마이크로웨이브를 활용한 금정광 조사는 시료 내 금의 최대용출효율과 용출속도를 증가시켰으며, 티오요소 용매제는 용출속도상수를 증가시켜주는 역할을 하였다. In this research, we investigate the effect of microwave pretreatment on the recovery of gold from the gold concentrates by thiourea leaching. The changes in mineral phases by decomposition of pyrites in the gold concentrates using microwave were observed, and the result of microwave irradiation showed that the temperature of the irradiated sample increases with increasing irradiation time. With the reaction of temperature increases, Sulfur (S) in pyrites was converted to sulfur dioxide (SO₂), and then the content of S in the sample was reduced. The analytical results of XRD and SEM-EDS showed that pyrites are converted to magnetite and hematite, and its surfaces are changed to a porous shape where micro-cracks are developed. The Au leaching efficiency from the irradiated gold concentrates using thiourea-mixed solvent increased with the increases of irradiation time and solvent concentration. The experimental results considering leaching parameters indicate that the mechanism of microwave irradiation increases the maximum leaching efficiency and leaching rate of the gold concentrates, and the solvent does a role for the increasing of leaching rate constant.

전기분해법을 이용한 금정광내 Te 회수 특성

김봉주,조강희,조지유,최낙철,박천영,Kim, Bong-Ju,Cho, Kang-Hee,Jo, Ji-Yu,Choi, Nag-Choul,Park, Cheon-Young 대한자원환경지질학회 2014 자원환경지질 Vol.47 No.6

In order to obtain pure metallic Te from gold concentrate, roasting treatment, hypochlorite leaching, Fe removal and electrolysis experiments were carried out. The contents of Au, Ag and Te from the concentrate sample and roasted sample were much more soluble in the hypochlorite solution than in aqua regia digestion, whereas the metals Pb, Zn, Fe and Cu were easier to leach with the aqua regia than the hypochlorite. With the addition of NaOH in the hypochlorite leaching solution prior to electrolysis, the Fe removal rate achieved was only 96% in the concentrate sample, while it reached 98% in the roasted sample. The results of electrolysis for 240 min, 98% of the metallic copper was recovered from the concentrate sample, while 99% was obtained from the roasted sample due to the removal of S by roasting. The amount of anode slime was also greater in the electrolytic solution with the roasted sample than with the concentrate sample. The results on the anode slime after the magnetic separation process showed the amount of metallic pure native tellurium recovered was greater in the roasted sample than in the concentrate sample. 금 정광으로부터 순수한 금속 형태의 Te을 얻기 위하여 소성처리, 차아염소산 용출, Fe 제거 및 전기분해실험을 수행하였다. 정광 및 소성시료에 포함되어 있는 Au, Ag 및 Te는 왕수보다 차아염소산에서 더 많이 용해된 반면에 Pb, Zn, Fe 및 Cu는 차아염소산보다는 왕수에서 더 많이 용출되었다. 전기분해하기 전, 차아염소산 용출-용액에 NaOH를 첨가한 결과 Fe가 정광시료에서 96% 제거되었지만 소성시료에서는 98% 제거되었다. 전기분해실험을 240분 동안 수행한 결과, 금속 구리가 정광시료에서 98% 회수된 반면에 소성시료에서 99%나 회수되었다. 이는 소성처리에 의하여 S가 제거되었기 때문이다. 양극 슬라임도 정광시료보다 소성시료의 전해질 용액에서 더 많이 생성되었다. 양극 슬라임을 자력선별한 결과 순수한 자연금속 형태의 텔루륨이 정광시료보다 소성시료에서 더 많이 회수되었다.

단안카메라를 활용한 ACC 시험평가 방법에 관한 연구

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.

한국증권시장(韓國證券市場)의 수익률예측(收益率豫測) 가능성(可能性)에 대한 연구(硏究)

김봉주,Kim, Bong-Ju 한국재무관리학회 1994 財務管理論叢 Vol.1 No.2

건설기능인력 자격 및 직급체계 구축방안 제안

김봉주,정명호,현창택,구교진,문현석,Kim, Bong-Ju,Jung, Myung-Ho,Hyun, Chang-Taek,Koo, Kyo-Jin,Moon, Hyun-Seok 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.5

건설기능인력은 최종 생산자로서 생산성 및 품질에 직접적으로 영향을 미치는 중요한 요소임에도 불구하고 방치된 채 고령화되고 고갈되는 양상을 띄고 있다. 이는 궁극적으로 젊은 기능인력의 건설사업 회피에서 기인한 것이다. 따라서 본 연구의 목적은 양질의 기능인력 수급을 위해서 기능인력의 자격 및 직급체계를 제안하여 건설기능인력 시장에 젊은 기능인력을 끌어들이는데 있다. 먼저, 본 연구에서는 국내 건설기능인력 체계의 현황과 문제점을 연구하였다. 그리고 전문가와의 면담과 독일, 호주의 사례 연구를 통해 국내에 적용 가능한 자격 및 직급체계 구축방안을 제안하였다. 본 연구에서 제안하고 있는 건설기능인력의 자격 및 직급체계의 활성화는 기능인력이 단순한 노무라는 이미지에서 탈피하여 전문분야임을 인식시킬 수 있으며, 젊고 유능한 기능인력을 건설산업으로 유입시킴으로써 건설기능인력의 생산성 향상, 전문성 강화, 고령화를 탈피시킬 수 있을 것으로 판단된다. 또한, 사회보장제도와의 연계를 통하여 고용안정화를 도모할 수 있을 것이다. The construction craft workers have been getting older and have become drained, in spite of the vital factor that it directly affects productivity and quality as a final producer. This situation in the construction industry is ultimately due to evasion of performances by young craft workers. Therefore, the aim of this study is to propose the certification and level system of construction craft workers and to extract young craft workers from the market for construction craft workers so as to supply and demand high quality of craft workers. First of all, the present status and problems of the domestic construction craft workers are considered in this study. Furthermore, the appropriate way to establish its certification and level system is suggested from the Interview with experts, as well as references of German and Australian case. The revitalization of certification and level system provided in this study is expected to ensure that the craft workers are not simple laborers, but are required the professional knowledge and skill. Besides, it will lead to strengthen specificity and to break from aging, by taking young and qualified craft workers into the construction industry. Also, it will promote an employment stability by connecting the social security system.

Cu 이온에 적응된 토착호산성박테리아를 이용한 폐광석으로부터 미생물용출 효율 향상

김봉주,위대웅,최낙철,박천영,Kim, Bong-Ju,Wi, Dae-Woong,Choi, Nag-Choul,Park, Cheon-Young 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.4

This study was carried out to leach valuable metal ions from the mine waste ore using the adapted indigenous bacteria. In order to tolerance the heavy metals, the indigenous bacteria were repeatedly subcultured in the adaptation-medium containing $CuSO_4{\cdot}5H_2O$ for 3 weeks and 6 weeks, respectively. As the adaptation experiment processed, the pH was rapidly decrease in the adaptation-medium of 6 weeks more than the 3 weeks. The result of bioleaching with the adapted bacteria for 42 days, the pH value of leaching-medium in the 3 weeks tend to increased, whereas the pH of the 6 weeks decreased. In decreasing the pH value in the adaptation-medium and in the leaching-medium, it was identified that the indigenous bacteria were adapted $Cu^{2+}$ the ion and the mine waste ores. The contents of Cu, Fe and Zn in the leaching solution were usually higher leached in 6 weeks than 3 weeks due to the adaptation. Considering the bioleaching rates of Cu, Fe and Zn from these leaching solutions, the highest increasing the efficiency metal ion were found to be Fe. Accordingly, it is expected that the more valuable element ions can be leached out from the any mine waste, if the adapted bacteria with heavy metals will apply in future bioleaching experiments.

Property Rights and Planned Obsolescence

김봉주(Bong-Ju Kim) 한국계량경제학회 2007 JOURNAL OF ECONOMIC THEORY AND ECONOMETRICS Vol.18 No.3

본 연구에서는 수요측면뿐만 아니라 공급측면에서 규모의 경제가 존재할 때, 지적 재산권 보호의 정도가 기술의 선택과 호환성에 어떠한 영향을 주는지를 고찰한다. 이러한 환경에서 본 연구는 다음의 결론을 얻고 있다: 첫째, 사회후생은 모든 소비자들이 대체기술이 이용 가능한 다음 기에 동일한 기술을 이용할 때 최대화된다. 둘째, 강한 지적재산권 보호는 지배적인 기업이 사회적으로 비효율적인 호환 기술을 도입하게 한다. 셋째, 약한 지적재산권의 보호는 계획적 진부화를 가속화할 수 있다. 마지막으로 약한 지적재산권 보호를 할 때 전방 호환성의 개방은 독점기업이 계획적 진부화를 하는 것을 방지할 수 있다. We examine how varying the property rights affects the adoption of technologies and the compatibility between products with demand side and supply side economies of scale. In this environment, we obtain the following results. First, the social welfare is maximized by having all consumers use the same technology in the second period. Second, strong property rights may induce the dominant firm to introduce socially inefficient compatible technologies. Third, weak property rights may accelerate planned obsolescence. Finally, under weak property rights, openness of forward compatibility may prevent monopolist from implementing planned obsolescence.

현대(現代)패션에 나타난 Purple의 조형성(造形性)과 이미지

김봉주 ( Bong Ju Kim ),이경희 ( Kyoung Hee Lee ) 한국패션비즈니스학회 2002 패션 비즈니스 Vol.6 No.4

The purpose of this study is to investigate purple image and formative properties in contemporary fashion. For the study of formative properties 152 kinds of costume samples from photographs in fashion magazines. For the study of image 40 kinds of costume samples is used and divided into tones : pale(Vp, Lgr, L), bright(P, B), vivid(S, V, Dp), dark(Gr, Dl, Dgr, Dk). A total 24 pairs of abjective words were used to measure the semantic differential scale in this study. The data were analyzed by factor analysis, ANOVA, MDS and regression analysis. The results are as follows; 1. Factor analysis has extracted 5 factors which consist of purple image in contemporary fashion. The factors are high quality, hardness and softness, simplicity, temperature, maturity. 2. There were significant differences in visual evaluation of purple tones. 3. The discrimination among. 4 purple ones was related to weight of purple 4. The evaluative dimensions of purple image in modern fashion were identified by Light - Heavy and Pale - Strong. 5. The image effect on Preference, Buying needs, Pleasant and Riches was consist of complicated sensibility.

Property Rights and Planned Obsolescence

Bong-Ju Kim(김봉주) 한국계량경제학회 2007 계량경제학보 Vol.18 No.3

본 연구에서는 수요측면뿐만 아니라 공급측면에서 규모의 경제가 존재할때, 지적 재산권 보호의 정도가 기술의 선택과 호환성에 어떠한 영향을 주는지를 고찰한다. 이러한 환경에서 본 연구는 다음의 결론을 얻고 있다: 첫째, 사회후생은 모든 소비자들이 대체기술이 이용 가능한 다음 기에 동일한 기술을 이용할 때 최대화된다. 둘째, 강한 지적재산권 보호는 지배적인 기업이 사회적으로 비효율적인 호환 기술을 도입하게 한다. 셋째, 약한 지적재산권의 보호는 계획적 진부화를 가속화할 수 있다. 마지막으로 약한 지적재산권 보호를 할 때 전방 호환성의 개방은 독점기업이 계획적 진부화를 하는 것을 방지할 수 있다. We examine how varying the property rights affects the adoption of technologies and the compatibility between products with demand side and supply side economies of scale. In this environment, we obtain the following results. First, the social welfare is maximized by having all consumers use the same technology in the second period. Second, strong property rights may induce the dominant firm to introduce socially inefficient compatible technologies. Third, weak property rights may accelerate planned obsolescence. Finally, under weak property rights, openness of forward compatibility may prevent monopolist from implementing planned obsolescence.

해양플랜트 설비 Corrugated Blast Wall의 폭발 충격응답 인자 특성에 관한 파라메트릭 연구

김봉주(Bong-Ju Kim),김병훈(Byung-Hoon Kim),손정민(Jung-Min Sohn),백점기(Jeom-Kee Paik),서정관(Jung-Kwan Seo) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.3

More than 70% if the accidents that occur on offshore installations stem from hydrocarbon explosions and fires, which, because they involve blast effects and heat, are extremely hazardous and have serious consequences in terms of human health, structural saftty, and the surrounding environment. Blast barriers are integral structures in a typical offshore topside module to protect personnel and safety critical equipment by preventing the escalation of events caused by hydrocarbon explosions. Many researchers have shown the adequacy of the simple design tool commonly used by the offshore industry for the analysis and design of blast walls. However, limited information is available for corrugated blast wall design with explosion impact response characteristics. Therefore, this paper presents a parametric study on the explosion impact response characteristics of an offshore installation’s stainless steel corrugated blast wall. This paperalso investigates and recommends design parameters for the structural design of a corrugated blast wall based on a nonlinear structural analysis of experiential results.