이제는 절주시대 : 청소년이 본 청소년 음주에 관한 이야기

최지나 대한보건협회 2007 건강생활 Vol.- No.56

열압착 접합 조건에 따른 경·연성 인쇄회로기판 간 Sn-58Bi 무연솔더 접합부의 기계적 특성

최지나,고민관,이상민,정승부,Choi, Ji-Na,Ko, Min-Kwan,Lee, Sang-Min,Jung, Seung-Boo 한국마이크로전자및패키징학회 2013 마이크로전자 및 패키징학회지 Vol.20 No.2

We investigated the optimum bonding conditions for thermo-compression bonding of electrodes between flexible printed circuit board(FPCB) and rigid printed circuit board(RPCB) with Sn-58Bi solder as interlayer. In order to figure out the optimum bonding conditions, peel test of FPCB/RPCB joint was conducted. The peel strength was affected by the bonding conditions, such as temperature and time. The fracture energies were calculated through F-x (Force-displacement) curve during peel test and the relationships between bonding conditions and fracture behaviors were investigated. The optimum condition for the thermo-compression bonding with Sn-58Bi solder was found to be temperature of $195^{\circ}C$ and time of 7 s. 본 연구에서는 Sn-58Bi 솔더를 이용한 경성 인쇄 회로 기판 (Rigid printed circuit board, RPCB)과 연성 인쇄회로 기판 (Flexible printed circuit board, FPCB) 간의 열압착 접합 시, 접합 조건에 따른 기계적 특성에 대하여 연구하였다. 접합 온도와 접합 시간을 변수로 열압착 접합을 실시하여 $90^{\circ}$ 필 테스트(Peel test)를 통해 접합 강도를 측정하고, 단면과 파단면을 관찰하였다. 접합 온도가 증가할수록 접합 강도가 증가하였으며, 접합 시간에 따른 접합 강도의 변화 또한 관찰할 수 있었다. 접합 시간이 증가하면서 접합부의 파괴에 영향을 미치는 요인이 솔더 층에서 금속간 화합물(Intermetallic compound, IMC) 층으로 변화하는 것을 관찰할 수 있었다. 필 테스트 과정의 F-x(Force-distance) curve를 통해 파괴 에너지를 계산하여 금속간 화합물이 접합 강도에 미치는 영향을 평가하였으며, 본 연구에서 $195^{\circ}C$, 7초 조건이 접합 강도와 파괴 에너지가 가장 높게 나타나는 최적 접합 조건으로 도출되었다.

탄소자원화 제품환경발자국(PEF) 산정 방법론 개발 방향 연구

최지나,이광원,안진주 한국에너지기후변화학회 2023 에너지기후변화학회지 Vol.18 No.2

With the recent interest of Net-zero as a key global agenda, the importance of assessing the environmental impact of products such as EU Product Environmental Footprint (PEF) has become more emphasized. Carbon upcycling is defined as a technology that recycles combustion exhaust gases, industrial off gases, and biogas as raw materials for other valuable products. This study summarizes the important factors that should be taken into account in developing PEF assessment methodology of such carbon upcycling products. Based on the carbon upcycling technologies proposed as key strategies in Korea’s net-zero related policies, representative carbon upcycling technologies have been selected and carbon upcycling products have been also classified into chemicals, fuels, polymers, bio-materials, and construction materials. In addition, key issues for life cycle assessment (LCA) are identified and the directions for accurate assessment of PEF for two types of carbon upcycling products- chemicals and fuels – have been suggested.

열등감의원인에대한성경적고찰

최지나 성결심리상담연구소 2009 성결심리상담 Vol.1 No.-

본연구는열등감의원인에대한성경적관점을고찰한것이다. 태어날때부터열등감을가지고태어난다고본Alfred B. Adler의시각에서바라본다면열등감에대한연구는연약한인간에대한이해로부터시작해야한다. 이에본연구는인간에대한정확한이해를위하여성경적인시각에서인간을바라볼것과인간의본성적인죄의문제가열등감에어떠한영향을미치는지에대해고려할것을전제로하고있다. 또한현대사회의수많은정보와메시지들가운데왜곡된정보가우리에게미치는영향들을분별하여열등감에대해바른시각으로접근할것을제안하였다.본연구에서살펴본열등감의성경적관점에서의원인은첫째, 교만이다. 인간에게어떠한방법으로열등감이들어오기시작하였는지죄의시작으로부터살펴보면서하나님의영광을차지하려는본성적인죄인으로서의모습을고찰하였다. 둘째, 하나님의메시지와사탄의메시지이다. 하나님의메시지와사탄의메시지를분별하지못하는나약함과하나님을떠나영적으로어두운상태에서자기자신의존재가치에대한절박한평가에매달리는모습들을살펴보았다. 셋째, 자기욕구라는우상이다.지금까지인정받고사랑받고싶어하는욕구가어떻게인간에게열등감을심어주는지살펴보았다. 본연구는인간은누구나상처를받으며연약한존재로살아가지만그이면에존재하는죄성까지합리화할수없다는것을전제하면서열등감에대한바른시각과그원인에대하여제시하고있다. This paper is pondering the reason of inferiority in the Biblicalpoint of view. Also this study is a proposition to understand the rightsof human beings in the Biblical view point. This creates the instinct ofbeing a sinner as it separates the proposed facts about inferiority.According to our this research, the first reason of inferiority is pridein the Biblical view point. Human beingis are creatures of the God,but the sinner instinct of people triggered the desire to achieve glorywhich belongs to God. As a result, people became criminals. OnlyGod can solve our sin and make us perfect. The second is confusionbetween of the message of the God and the message of the Satan. Weare trying not to think by the grace of God, I am what I am, to avoidjudgement from other people. We have no the spiritual awakeningbetween the message of the God and the message of the Satan. Thethird reason is idol of self desire. The desire to get love and to getrecognition from people cause the inferiority.Finally this study concludes that you can not retrieve ones selfrespect and love it concurrently it can only be retrieved through yourrelationship with God.

배출권거래제와 온실가스 자원화 기술

최지나 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

이산화탄소 전환기술 (CCU: Carbon Capture and Utilization)은 단순히 감축 및 처리 대상으로만 인식되어오던 이산화탄소를 연료나 화학 원료 등과 같은 자원으로 활용하는 기술로써, 온실가스 저감을 통한 기후변화 대응력 제고 및 국가경쟁력 강화를 위한 핵심 기술 중 하나로 인식되고 있다. 그러나 이산화탄소 전환 공정에서 에너지 소비에 따른 온실가스의 추가 발생이 예상되는 바 CCU 기술의 적용이 반드시 전과정 온실가스 감축을 보장하는 것은 아니다. 이에 본 발표에서는 이산화탄소 전환 기술의 온실가스 감축효과를 산정ㆍ평가할 수 있는 방법론을 소개하고자 한다. 또한, 현재 국내에서 시행 중인 배출권거래제 현황을 간략히 살펴보고, CCU 기술이 배출권거래제 시장과 연계되어 온실가스 감축량을 인정받기 위해 해결해야 할 이슈 등에 대하여 살펴보고자 한다.

태양광 활용 물분해 수소제조를 위한 포피린-이산화티탄 가시광광촉매 개발

최지나,유지선,황지나,권순일,김범식 한국공업화학회 2013 한국공업화학회 연구논문 초록집 Vol.2013 No.1

CCU 기술개발 로드맵 수립 현황

최지나 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.0

Sn-0.7Cu-xZn와 OSP 표면처리 된 기판의 솔더접합부의 고속 전단강도에 미치는 Zn의 영향

최지나,방제오,정승부,Choi, Ji-Na,Bang, Jae-Oh,Jung, Seung-Boo 한국마이크로전자및패키징학회 2017 마이크로전자 및 패키징학회지 Vol.24 No.1

본 연구에서는 Sn-0.7Cu-xZn 무연솔더와 OSP 표면처리 된 솔더접합부의 전단강도를 Zn 함유량에 따라 평가하였다. 다섯 종류의 Sn-0.7Cu-xZn (x=0, 0.5, 1.0, 1.5, 2.0 wt.%) 솔더페이스트를 제작한 뒤, OSP(organic solderability preservative) 표면처리 한 PCB(printed circuit board) 기판의 전극에 리플로우 공정으로 180 um 직경의 솔더볼을 형성하였다. 전단강도는 두 가지 조건의 전단속도(0.01, 0.1 m/s)로 고속전단시험(high speed shear test)을 통해 측정하였고, 고속전단시험 시에 측정된 F-x(Force-distance) curve를 통해 파괴에너지(fracture energy)를 계산하였다, SEM(주사전자현미경, scanning electron microscopy)과 EDS(energy dispersive spectroscopy) 분석을 통하여 단면과 파단면을 관찰하였고, 금속간 화합물(intermetallic compound, IMC) 층을 분석하였다. Zn 함유량이 증가함에 따라 금속간 화합물 층의 두께는 감소하였고, Zn 함유량이 0.5 wt.%일 때 가장 높은 전단 강도(shear strength)를 나타내었다. 전체적으로 높은 전단속도 조건의 전단강도 값이 낮은 전단속도 조건의 전단강도보다 높았다. We investigated effect of Zn content on shear strengh of Sn-0.7Cu-xZn and OSP surface finished solder joints. Five pastes of Sn-0.7Cu-xZn (x=0, 0.5, 1.0, 1.5, 2.0 wt.%) solders were fabricated by mixing of solder powder and flux using planatary mixer. $180{\mu}m$ diameter solder balls were formed on OSP surface finished Cu electrodes by screen print method, and the reflow process was performed. The shear strength was evaluated with two high shear speeds; 0.01 and 0.1 m/s. The thickness of the intermetallic compound(IMC) layer was decreased with increasing Zn content in Sn-0.7Cu-xZn solder. The highest shear strength was 3.47 N at the Zn content of 0.5 wt.%. As a whole, the shear strength at condition of 0.1 m/s was higher than that of 0.01 m/s because of impact stress. Fracture energies were calculated by F-x (Force-displacement) curve during high speed shear test and the tendency of fracture energy and that of shear strength were good agreement each other. Fracture took place within solder matrix at lower Zn content, and fracture occured near the interface of OSP surface finished Cu electrode and solder at higher Zn content.

신기후체제에 따른 국내외 온실가스 저감 방안 및 CCU 기술

최지나 한국에너지기후변화학회 2015 한국에너지기후변화학회 학술대회 Vol.2015 No.11

약사의 외상중환자실 팀 활동 참여 전후의 항생제 및 영양지원 적절성 평가

최지나,손현경,정은주,김영환,강지은 한국병원약사회 2021 병원약사회지 Vol.38 No.1

Background : Clinical pharmacists have participated in a multidisciplinary team of doctors, pharmacists, nurses, and nutritionists at the Trauma Intensive Care Unit (TICU) of the National Medical Center since June 2019. This study was conducted to analyze drug interventions and drug information provided by the pharmacist, and evaluate the appropriateness of antibiotic prescriptions and nutritional support. Methods : We reviewed TICU daily rounds reports from July to September 2019. To evaluate the appropriateness of antibiotics and nutritional support, we retrospectively investigated and compared the medical records before their participation (from March to May 2019) and after (from July to September 2019). We reviewed the bacterial susceptibility testing results, antibiotic dosages, and nutritional support for the daily requirements of calories and protein, then considered them appropriate if all criteria were met. Results : Sixty-two daily rounds were conducted on 48 patients with the pharmacists. There were 89 drug interventions and 72 cases of drug information services. Seventy (78.7%) interventions were accepted, which included 21 (23.6%) cases of therapeutic drug monitoring, 15 (16.9%) cases of nutritional support, and 13 (14.6%) cases of renal dosage adjustment. Of the drug information services conducted, 18 (25.0%) cases concerned the names of available drugs with the correct ingredients, 11 (15.3%) cases were related to the drug dosing regimen, and eight (11.1%) cases pertained to adverse drug events. There were 12 patients over the 3-month period from March to May and 39 from July to September 2019. There were 164 appropriate cases of antibiotic prescriptions out of 197 (83.2%) from March to May and 406 out of 474 (85.7%) from July to September 2019. There were 175 appropriate cases of nutritional support out of 265 (66.0%) from March to May and 394 out of 491 (80.2%) from July to September. Conclusion : The appropriateness of antibiotic prescriptions and nutritional support was increased after pharmacists’ participation in the TICU multidisciplinary team. This study had a limitation in assessing exceptional clinical conditions given the nature of the retrospective review.