고속전단 시험을 이용한 Sn-37Pb BGA solder joints의 기계적 신뢰성 특성 평가

장진규,하상수,하상옥,이종근,문정탁,박재현,서원찬,정승부,Jang, Jin-Kyu,Ha, Sang-Su,Ha, Sang-Ok,Lee, Jong-Gun,Moon, Jung-Tak,Park, Jai-Hyun,Seo, Won-Chan,Jung, Seung-Boo 한국마이크로전자및패키징학회 2008 마이크로전자 및 패키징학회지 Vol.15 No.4

본 연구에서는 BGA(Ball Grid Array) 솔더 접합부에 high impact가 가해졌을 경우 접합부의 기계적 특성에 대해서 연구하였다. 시편은 ENIG(Electroless Nickel Immersion Gold) 표면 처리된 FR-4 기판 위에 직경이 500 ${\mu}m$인 Sn-37Pb 솔더볼을 BGA 방식으로 배열하고 리플로우(Reflow)를 통하여 제작하였다. HTS(High Temperature Storage) 테스트를 위해, 시편을 일정한 온도의 $120^{\circ}C$에서 250시간 동안 시효처리(Aging)를 실시하였다. 시효처리 후, 각각의 시편은 고속 전단 시험기(Dage-4000HS)를 이용하여 속도 변수는 0.01, 0.1, 1, 3 m/s로 설정하여 고속전단 시험을 실시하였다. 전단시험 후, 솔더 접합 계면과 파면을 주사전자현미경(Scanning Electron Microscope, SEM)을 통하여 관찰하였다. 솔더 접합 계면에는 $Ni_3Sn_4$의 금속간 화합물이 성장하였으며, 시효처리 후, 솔더 접합 계면에 생성된 금속간 화합물의 두께가 증가하는 것을 관찰 할 수 있었다. 전단 시험 결과, 전단 속도가 빨라짐에 따라 전단 강도값은 증가하는 경향을 나타내었다. 솔더 접합부의 파단은 전단 속도와 시효처리 시간에 따라 다양한 파괴 모드로 진행됨을 알 수 있었다. 또한, 파괴 모드는 연성파괴 형상을 보이다가 전단속도가 증가함에 따라 취성 파괴 형상으로 변하는 것을 알 수 있었다. The mechanical shear strength of BGA(Ball Grid Array) solder joints under high impact loading was investigated. The Sn-37Pb solder balls with a diameter of $500{\mu}m$ were placed on the pads of FR-4 substrates with ENIG(Electroless Nickel Immersion Gold) surface treatment and reflowed. For the High Temperature Storage(HTS) test, the samples were aged a constant testing temperature of $120^{\circ}C$ for up to 250h. After the HTS test, high speed shear tests with various shear speed of 0.01, 0.1, 1, 3 m/s were conducted. $Ni_3Sn_4$ intermetallic compound(IMC) layer was observed at the solder/Ni-P interface and thickness of IMC was increased with aging process. The shear strength increased with increasing shear speed. The fracture surfaces of solder joints showed various fracture modes dependent on shear speed and aging time. Fracture mode was changed from ductile fracture to brittle fracture with increasing shear speed.

시선집중 - Kodak과 Apple 및 RIM 간의 ITC에서의 특허 분쟁

장진규,Jang, Jin-Gyu 한국발명진흥회 2011 發明特許 Vol.36 No.5

CT위장검사시 체위변화에 따른 영상의 비교

장진규(Jin Kyoo Jang),김정훈(Jeong Hoon Kim),조현종(Hyeon Jong Cho),하동윤(Dong Yoon Ha),이용문(Yong Moon Lee) 대한CT영상기술학회 2007 대한CT영상기술학회지 Vol.9 No.1

Purpose We classified three groups with position change from effection of bubble by using effervescent granules in CT gastrography. We compared the CT gastrography images with 3D reconstruction of the stomach and evaluated an effect to stomach tube image clinically. Materials and Methods In 90 adults (M:F=67:23, mean age; 59years) were performed. Before scanning, 8 g of effervescent granules with a small amount of vvater is administered orally to distend the stomach. CT gastrography is three groups: group I is only spine. roup II is Adjusted supine. groub III is prone, supine and LPO position. Ionic contrast material injection(150ml) was administered at a rate of 3ml/sec by a power injector for better reproducibility in follow-up examinations. We were taken a axial images(0.7mm) using the Siemens Somatom sensation 16(Erlangen, Germany) MIXT and then transmited the data GE workstation(AW4.1_06). We performed of 3 types randering method (Transparent Image, shaded surface display, virtual Endoscopy) using the Image quality grading method:(many, small, nil) Results The Results obtained as followed: group I Quantity of bubble (many=13, small=9, nil=8) group II Quantity of bubble (many=3, small=4, nil=23) group III Quantity of bubble (many=1, small=7, nil=22) Conclusion CT gastrography showed bubble using effervescent granules. group I got the image where the bubble is many, the group II, III got the image quality which is excellent. From the results of these studies, We were taken the best Image quality of all types post processing method in group III. group III for CT gastrography guaranteed the excellent 3D CT gastrographic images.

탄소자원화 기술의 경제성 평가 및 상업화 방안

장진규(Jin Gyu Jang),조현대,이광호,이혜진,김지선 과학기술정책연구원 2019 정책연구 Vol.- No.-

At the UNFCCC COP 21, participant countries discussed the establishment of “Post-2020 New Climate Changes Regime” as a novel approach to climate change issue differentiated from the existing Kyoto Protocol. 196 member states finally signed the Paris Agreement to reduce greenhouse gas emissions. South Korea’s National Assembly also ratified the Paris Agreement in November 2016. The country has set an emission reduction target of 37% from the business-as-usual level by 2030 and is striving to achieve this ambitious target. After the early effectuation of the Paris Agreement, countries around the world are pursuing the development of technologies required for the reduction of greenhouse gases. The developed countries are trying to transfer appropriate climate technologies to developing countries. South Korea is also expanding its R&D programs in climate technologies in order to secure its leading position in climate technology. South Korea’s R&D investment in technologies mitigating climate change is aimed at developing strategic technologies that can contribute to greenhouse gas reduction. In the meantime, South Korea is making preemptive investment in promising technologies that are expected to lead future climate change though the market for these technologies has not yet formed. Renewable energy technologies and other technologies mitigating carbon emissions are important and technologies that help utilize carbon as useful resources are also becoming increasingly important. The CCU (Carbon Capture Utilization) technology refers to a whole new production process using carbon dioxide as input to produce goods. Like this, CCU technology promotes production activities while mitigating carbon dioxide. Since 2016, South Korea has been implementing a national strategy of using carbon as resources. However, the lack of evaluation of carbon upcycling technology’s economic value is making it difficult for the South Korean government and its private sector to justify their efforts of developing and commercializing carbon upcycling technologies. The present study attempts to define methods of measuring the amount of greenhouse gas reduction and its economic value when the carbo upcycling technology development is completed successfully. In this context, this study is meaningful as it helps carbon upcycling technology developed as part of government initiative contribute to the achievement of greenhouse gas reduction targets home and abroad. This study is also significant as it objectively identifies carbon upcycling technology’s potential to help create new businesses. It is the research team’s wish that the results of the present study encourage both the government and companies to participate in the carbon upcycling technology development and commercialization, which will greatly enhance mid- and long-term national interests.

비디오 공유 소셜 플랫폼의 새로운 패러다임: 일상 경험의 내러티브

장진규(Jinkyu Jang),김진욱(Jinwook Kim),엄하정(Hajung Aum),신현식(Hyunsik Shin),김진우(Jinwoo Kim) 한국HCI학회 2014 한국HCI학회 학술대회 Vol.2014 No.2

최근 타임라인상에서 자신의 일상 경험을 공유하고 커뮤니케이션 하기 위해, 많은 사람들이 타인에게 자신의 경험을 보다 잘 전달하고자 Instagram 이나 Vine 과 같이 자신의 경험을 기록한 비디오를 매력적으로 편집하고 공유할 수 있는 플랫폼을 대체 수단으로 선택하고 있다. 본 연구의 목적은 Attentional Focus, Narrative Understanding, Narrative Presence, Emotional Engagement 의 4 가지 Factor 를 도입하여, 소셜 플랫폼 상에서 공유되는 비디오의 시간 형태에 따른 Narrative Engagement 의 매커니즘에 관한 이론적 인과 모형을 제시하고 검증하는 것이다. 연구 방법으로는 within-subject factorial design 으로 controlled experiment 를 실시하였다. 각 자극 별로 비디오 공유 소셜 플랫폼 상에서 활용할 수 있는 좋아요, 댓글, 즐겨찾기, 소환, 재생라인댓글 의 5 가지 Social Feature 를 직접 사용할 수 있게 하였다. 연구 결과, 총 시간 길이와 장면 전환 속도의 상호작용이 Narrative Engagement 의 4 가지 Factor 에 유의미한 영향을 미침을 밝혔다. 최종적으로 이론적, 실용적 함의가 도출되었다. Nowadays, we recognize that many people want to share their experience effectively. So they have been using Instagram or Vine to record and edit their video attractively. The purpose of our study was to suggest and verify the theoretical constructed causal model of narrative engagement through the form of shared video’s time on social platform. In order to figure it out, we set the contributing factors as attentional forcus, narrative understanding, narrative presence, and emotional engagement. We conducted within-subject factorial design in controlled experiment. Participents were able to use five social features which is like button, reply, favorite, recall, attach to playline reply. Results showed that the interaction of the level of video’s time length and scene transition rate is the effect on narrative engagement. Finally, theoretical and practical implication were discussed at the end of the paper.

간공여자의 Hepatic Vascular 3D-CT Post processing의 유용성과 혈관변이의 분석

장진규(Jin Kyoo Jang),박상협(Sang Hyub Park),나사라(Sa ra Na),김선기(Seun Ki Kim) 대한CT영상기술학회 2013 대한CT영상기술학회지 Vol.15 No.1

목적: 생체간이식에서 간 공여자가 수술 전에 검사하는 MDCT angiography후 간 혈관의 영상처리의 기법과 다양한 혈관형태를 분석하고 유용성을 알아보고자한다. 대상 및 방법: 본원에서 2012년 1월부터 4월까지 간 공여자로 총206명의 환자로 남자:142명 여자 64명이었고 나이는17세에서 58세로 평균 나이는 32세이고, 영상은 MDCT angiography 동맥상, 간 문맥상으로 0.7㎜ Thin Slice Axial 영상을 얻었다. 장비는 GE Workstation (AW4.6)에서 3D기법 중 MIP로 재구성했으며, Axial image에서 혈관에 평행하게 Slabs와 Angle주어 Oblique Coronal로 재구성한 후, Oblique coronal image plane에서 Double Angle을 주었다. 이것은 영상 처리는 방사선사 1명에 의해서 진행되었으며, 방사선과 전문의 2명이 해부학적 구조를 판독했다. 결과: 다양한 slabs 두께로 coronal oblique MIP image 에서 Double angle주면 모든 혈관은 찾을 수 있었다. 간 동맥은 12가지 Type이었고 그중 classic Type 94건 46%, MHA origin from RHA 74건 36%였다. 간 정맥의 RIHV의 Accessory Vein은 206건중 163명 79% 이었고, 총 10가지 Type이었다. 간 문맥은 classic Type 179건 93%였고, 총 4 가지였다. 결론: 간 공여자의 간 동맥과 간정맥에 Accessory Vein Type은 다양하고 복잡하기 때문에 영상처리 시 주의가 필요하다. 간 실질, 간 문맥, 간 동맥의 CT값의 차이가 적은 것과 MHA와 같이 가는 혈관, RIHV는 기시부가 되는 혈관을 재구성하려면 Axial 영상을 참고하여 영상처리를 해야 보다 쉽게 혈관들을 표현할 수 있다. 또한 혈관의 구조, 길이, 굵기 및 영상의 대조도 분해능에 따라 적당한 Slabs를 적용하여 Double Angle기법을 사용해야 한다. 3D영상은 수술을 계획하는 외과의에게 정확한 정보를 제공할 수 있고, 수술시간 단축에 기여할 수 있으므로 큰 수술을 하는 간 공여자에게도 유용하리라고 사료된다. Purpose: To analyze various hepatic vascular structures and to evaluate usefulness of hepatic vascular 3D-CT post processing in liver donors who underwent preoperative MDCT angiography. Materials and method: From January 2012 to April 2012, 206 healthy volunteers (male : female; 142 : 64, mean age 32 years) underwent MDCT angiography. 0.7mm thin slice axial images of arterial phase and portal phase were acquired. Under GE workstation (AW 4.6) Maximum Intensity Projection (MIP) was applied through the images. Oblique coronal plane were reconstructed parallel to the axis of vessel and double angle technique was applied. A radiotechnologist reconstructed the images and two radiologists read the anatomical structures. Result: Every vessels can be found through double angle technique in coronal MIP images with various slab thickness. Hepatic arteries consisted of twelve types. Among them classic type accounted for 46% (ninety four cases),MHA origin from RHA accounted for 36%(seventy four cases). Hepatic vein had ten types. Accessory Vein of RIHV accounted for 79% (one hundred sixty three out of two hundred six cases). Portal vein had four cases and the classic type occupied 93% (one hundred seventy nine cases). Conclusion: In living donors liver transplantation, 3D MIP reconstruction of MDCT angiography should be performed with oblique coronal images and double angle technique according to the vascular sturctures, thickness and contrast resolution while the direction and thickness of vessels should be considered with raw data axial images. Especially when the structures whose CT numbers have small differences like liver tissues, portal veins and hepatic arteries or when MHA and RIHV are reconstructed axial images are essential. Considering hepatic arteries and accessory vein types of liver donors are complex, this reconstruction technique can be useful for the safety of liver donors producing accurate information to surgeons.

방사광 X-선 영상법을 이용한 소수성 마이크로 관 내 물-글리세롤 혼합물 슬러그 계면 가시화를 통한 동적접촉각 상관식 검증

장진규 ( Jin Gyu Jang ),김영현 ( Young Hyun Kim ),김경준 ( Kyoung Joon Kim ),이정훈 ( Junghoon Lee ),이연원 ( Yeon Won Lee ),유동인 ( Dong In Yu ) 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.1

움직이는 접촉선에서의 계면 거동을 이해하기 위해 많은 연구자들은 동적접촉각에 대한 연구를 지속적으로 연구해왔다. 하지만 가시화 기술의 한계로 선행연구에서의 동적접촉각에 대한 실험은 일반적으로 친수성 미세관에서 가시광선 기반으로 실험이 수행되었다. 하지만, 최근 다양한 연구 및 산업 분야에서 소수성 미세관에서의 동적접촉각에 대한 연구의 필요성이 대두되고 있다. 따라서, 본 연구에서는 높은 공간 및 시간 분해능을 갖는 방사광 X-선 영상법을 이용하여 소수성 마이크로 튜브 내 물-글리세롤 혼합물 슬러그의 동적접촉각을 측정하였으며, 이를 바탕으로 기존의 동적접촉각 실험 상관식을 검증하였다. Dynamic contact angles have investigated by numerous researchers for understanding interfacial behavior at moving contact lines However, due to limitation of visualization techniques, previous experiments for dynamic contact angles have conducted limitedly in hydrophilic capillary tubes based on visible ray. Recently, there is continuous need for research on dynamic contact angles in hydrophobic capillary tubes on various research and industrial fields. Therefore, in this study, we measure the dynamic contact angles of water-glycerol mixture slug in hydrophobic microtubes using synchrotron X-ray imaging. Based on the visualized data, we verified the previous experimental correlations for dynamic contact angles.

CIC 데시메이션 필터를 이용한 Sigma-Delta A/D 변환기 이득 최적화 방식

장진규(Jin Kyu Jang),장영범(Young Beom Jang) 大韓電子工學會 2010 電子工學會論文誌-TC (Telecommunications) Vol.47 No.4

이 논문에서는 Sigma-Delta A/D 변환기의 새로운 이득 최적화 방식을 제안한다. 제안된 방식에서는 변조기의 SNR을 최대화하는 다수개의 이득 값 후보군을 먼저 선정한 후에 CIC 데시메이션 필터를 통과시켜 가장 작은 MSE를 보이는 이득 값을 결정하는 방식이다. 실험에 사용된 변조기는 단순화를 위하여 1차의 단일 비트 변조기를 사용하였다. 모의실험을 통하여 변조기의 후보군 중 2위를 기록한 이득 값이 가장 작은 MSE를 보였다. 제안된 방식은 변조기의 SNR을 최대화하는 기존의 아이디어와 데시메이션 필터로 사용되는 CIC 필터의 샘플 합 특성을 이용하여 최적의 이득 값을 결정하는 방식이다. In this paper, we propose a new gain optimization technique for Sigma-Delta A/D converters. In the proposed scheme, multiple gain set candidates showing maximum SNR in the modulator block are selected, and then multiple gain set candidates are investigated for minimum MSE in decimation block. Through CIC decimation filter simulation, it is shown that second SNR ranking candidate in modulation block is the best gain set.

人蔘의 年根別 사포닌含量 變化에 관한 硏究

장진규(Jin Gyu Jang),이광승(Kwang Seung Lee),권대원(Dae Won Kwon),남기열(Ki Yeul Nam),최진호(Jin Ho Choi) 한국식품영양과학회 1983 한국식품영양과학회지 Vol.12 No.1

人蔘의 主要藥理成分으로 밝혀지고 있는 사포닌의 含量變化를 중심으로 하여 人蔘의 採掘年數의 診斷과 藥理作用에 대한 基礎資料를 얻기 위하여 栽培人蔘의 生育年數에 따른 總사포닌 含量의 變化, diol사포닌과 triol사포닌의 比較 및 PT/PD 比등을 調査하여 다음과 같은 結果를 얻었다.<br/> (1) 生育年數에 따른 總사포닌含量은 年根이 증가할 수록 總사포닌含量이 증가 하였는데 5年根에서 5.19%로 가장 높았으며 6年根에서는 4.80%로 오히려 감소하는 경향이었다.<br/> (2) 總사포닌含量만을 考慮한다면 6年根보다 5年根에서 採掘함이 바람직하다.<br/> (3) 生育年數에 따른 PT/PD比를 보면 年根이 증가할 수록 차차 증가하여 6年根이 0.51로서 가장높았으며 5年根의 0.48보다 6.25%나 더 높았다.<br/> (4) 따라서 PT/PD比의 증가량을 고려한다면 6年根에서 採掘함이 바람직 하였다. To determine harvesting time of ginseng, the changes of saponin contents and PT/PD ratios of triol saponin vs. diol saponin in relation to root age of Panax ginseng.<br/> Total saponin contents were increased in relation to root age, 5-years was higher than 6-years for saponin contents. Therefore, it considered that can be obtained the desired results to harvest at 5-years.<br/> Also, PT/PD ratios were increased in relation to root age, 6-years was highest. Considering PT/PD ratios in relation with pharmaceutical action, it must be harvested at 6-years.

적정 녹색기후기술에 대한 해외수요 조사 및 국제협력 활성화 방안

장진규(Jin Gyu Jang),박환일(Hwanil Park),박동배(Dong Bae Park),유하영(Ha Young Yu) 과학기술정책연구원 2017 정책연구 Vol.- No.-

In this research, we search for the overseas demand on green climate technology by developing countries through analyzing various related domestic and foreign reports and documents. We also select several specific green climate technologies demanded by such countries as Indonesia and Brunei and try to dig up related Korean technologies, which would be existing in private companies, public research institutes or universities, and to prepare some plans to boost global green climate technology transfer and commercialization. Especially, regarding demand analysis of green climate technology, we, first of all, analyze UNFCCC (UN Framework Convention on Climate Change) TNA (Technology Needs Assessment) database. Based on the result of analysis of UNFCCC TNA, we supply the characteristics of green climate technology demand by industry, country and ect. For the purpose of specifying the plans to boost global green climate technology transfer and commercialization, we deal with three real cases of appropriate green climate technologies. First one is the bio-energy production technology based on CCU (Carbon Capture and Utilization). Second one is the smart fish farm technology with solar renewable energy production system. Last one is the co-location model of fisheries with off-shore wind farm. We try to prepare some specific plans to facilitate the transfer and commercialization of each green climate technology above mentioned. In the conclusion part, we try to suggest several specific policy implications to boost international cooperation with green climate technologies. For example, we suggest the need for raising green climate fund to attain the goal of overseas mitigation of GHG (Green House Gas) emission.