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N-Carbamoylglycine 및 N-Salicylideneaniline과 Metal ions들에 의한 발광 세기의 변화
김지웅,김영해,Kim, Ji Ung,Kim, Yeong Hae 대한화학회 2002 대한화학회지 Vol.46 No.6
We have used PET chemosensors in the determination of N-carbamoylglycine. When N-carbam-oylglycine reacts with complex already made by the fluorophore and metal ion, the luminescence intensity can be changed and this phenomenon can be utilized in quantification. We used three metal ions, $Zn^{2+}$, $Ni^{2+}$, $Cu^{2+}$ and in order to investigate selectivity an acetic acid was used. $Ni^{2+}$ ion showed change in the eT mechanism by the anions. $Cu^{2+}$ ion showed the ability to distinguish N-carbamoylglycine from an acetic acid and it is noteworthy that $Zn^{2+}$ ion can change luminescence sensitively according to concentration. 본 실험은 N-Carbamoylglycine의 농도 결정에 PET sensor를 응용한 것이다.N-Carbamoylglycine이 금속 이온에 리간드로 작용하면서 착물을 만들고 있는 fluorophore의 luminescence intensity를 변화시킬수 있고 이를 통해 농도결정에 이용할 수 있다. 사용한 금속이 온은 $Ni^{2+}$, $Cu^{2+}$ 그리고 $Zn^{2+}$이며 비교대상으로 아세트산을 사용하여 선택성을 확인하였다. $Ni^{2+}$ 이온은 음이온 리간드에 의해서 eT mechanism 변화를 보여주었으며 , $Cu^{2+}$이온은 아세트산과 N-Carbamoylglycine을 구별하는 선택성을 가지고 있으며, $Zn^{2+}$이온은 매우 예민한 luminscence intensity 변화를 일으키는 것으로 나타났다.
수산물 선호도에 의한 시장세분화와 친숙시장 형성과정에 관한 연구
김지웅 ( Ji-ung Kim ),장영수 ( Young-soo Jang ) 한국수산경영학회 2016 수산경영론집 Vol.47 No.3
The purpose of this research paper is to segment seafood market and find the factor and process that divide the segment market. Cluster analysis and in-depth interview was performed to identify meaningful segment market. The result of the research found three segment market such as seafood integration familiarity group, domestic seafood familiarity group, seafood unfamiliarity group. Seafood integration familiarity group is active consumer that consume both domestic and imported seafood at home. This group have high preference and familiarity about seafood. Seafood familiarity group purchase imported seafood for the reason that imported seafood is cheaper than domestic seafood and have similar quality level. Domestic seafood familiarity group consume mostly domestic seafood and not purchase imported seafood for the reason that imported seafood have low quality and safety. This group have high preference and familiarity about seafood. Seafood unfamiliarity group is low preference group about seafood and seldom eat at home. This study found that the main factor that divide segment market is seafood familiarity that formed by experiencing seafood in youth and seafood familiarity is main factor that determine consumption degree of seafood at home.
컨조인트 분석을 활용한 양식장 HACCP 인증 선호도 분석
김지웅 ( Ji-ung Kim ),박지현 ( Ji-hyeon Park ) 한국수산경영학회 2020 수산경영론집 Vol.51 No.2
The purpose of this study is to analyze consumer preference for fish farm HACCP certification using conjoint analysis. This study used raw flatfish product to evaluate the fish farm HACCP. In this study, 500 consumers were surveyed using panel survey and stratified sampling. In the recognition analysis, the farm HACCP certification system was found to be highly recognized by consumers. It can be seen that the brand assets accumulated by existing food and agricultural HACCP certification were transfered to the fish farm HACCP and absorbed. Consumers perceived fish farm HACCP certification as similar one with existing food and agricultural HACCP. Conjoint analysis evaluated three levels factors. The attributes and levels evaluated were : price(25,800 won, 28,400 won, 31,000 won), certification(fish farm HACCP, seafood traceability, and non certified), and origin(domestic, JEJU, and WANDO). The important levels were in order of price(40.8%), certification(30.2%) and origin(29.0%). We found that consumers give higher utility to fish farm HACCP certification compared with non certified and seafood traceability certification. Market simulation results showed that the fish farm HACCP product has 12%p higher market share than non certified products. Seafood traceability certification showed 4.6%p higher market share than non certified products.
A study on the Corrosion Properties of a Dissimilar Self-Piercing Rivet with CFRP-Steel joints
Ji-Ung Kim(김지웅),Jin-Hee Bae(배진희),Chanyoung Jeong(정찬영),Dong-Hyuck Kam(감동혁),Cheolhee Kim(김철희),Yeong-Do Park(박영도) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Self-Piercing Rivet (SPR) is able to joint several kinds of metal and non-metal supports together as new performing technology. The combined effect of joint configuration and environmental conditions could have detrimental effects both a corrosion and a mechanical behavior with dissimilar material SPR joints. The corrosion properties of a Self-Piercing Rivet joint of carbon fiber reinforced plastic (CFRP) laminate and galvannealed steel (590 MPa) joint by an Almac-coated rivet were investigated. The aiming of this experiment, dissimilar joints were exposed to salt-spray environmental conditions according to KS D 9502 standard that is a neutral salt-spray method for 60 days. Furthermore, it was conducted to both open-circuit potential test and potentio-dynamic test in 3.5 wt% NaCl solution. Meanwhile, the tests of tensile shear were carried out in order to evaluate the mechanical performances of the riveted joints during the salt spray exposition. The results show that the mechanical performance of the SPR joints progressively was decreased as function of increasing exposure time. The corrosion behavior was confirmed by the SEM/EDS analysis after the exposure of the joint in the chamber.