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이종현,신장규,이상룡,천희곤,조찬섭,심준환,류인식,박석홍,허정준,박기열 경북대학교 센서기술연구소 1994 연차보고서 Vol.1994 No.-
자동차의 air-bag 장치에 실용될 수 있는 압저항형 단결정 실리콘 가속도센서 칩을 개발하기 위하여 결정 실리콘 미세구조의 제조방법을 확립하고, 단위공정의 검증을 통하여 일괄공정에 의한 PROTO-TYPE 칩을 만드는 기술을 연구하였다. 단결정 실리콘 미세구조는 선택확산법을 이용하여 정확히 선택된 영역에만 air-gap을 형성하여 미세구조의 측면식각을 방지하는 선택확산법에 의한 실리콘 마이크로머시닝 기술로 제조하였다. 일괄공정을 위한 단위공정확립을 위하여 PROTY-TYPE 8빔 브릿지형 가속도 센서를 제조하였다. 제조된 칩의 가속도에 따른 출력전압은 선형성을 나타내고 있으며, 감도는 약 50 ㎶/V·g로 나타났다. 이 감도는 50G용 가속도센서의 사양을 만족하지 못했다. 이는 공정에 의한 문제라기 보다는 가속도센서의 시뮬레이션에 의해 설계한 구조가 이미 원하는 감도에 못 미친다는 것으로 생각된다. 따라서 2차 공정으로 제조될 가속도센서의 파라미터를 SuperSAP 유한요소 패키지를 이용하여 실리콘 미세구조부의 파라미터에 따른 특성을 시뮬레이션하였다. 설계된 50G용 가속도센서의 mass Pad의 반경 및 빔 길이, 빔 폭, 빔 두께, 그리고 mass의 각 파라미터 값은 700 ㎛, 120 ㎛, 5 ㎛, 1.0 ㎎ 이었다. 반도체 공정기술, 관성질량 제조법 및 선택확산을 이용한 마이크로머시닝을 사용하여 일괄공정으로 8빔 브린지형 가속도센서를 제조하였다. We researched the establishment of the silicon microstructure fabrication technique to develop a piezoresistive type silicon acceleration sensor chip and the technique to make a proto-type chip by the verification of the unit-process. Silicon microstructure is fabricated silicon micro-machining by selective diffusion method. This method prevent a side-etching of microstructure because selective diffused region is only formed an air-gap. We fabricated a proto-type 8-beam bridge-type acceleration sensor to establish the unit-process for the batch-process. The output voltage of the chip represented linearity with acceleration, and the sensitivity was about 50 ㎶/V·g. But this sensitivity dosen't satisfy the requirements of a practical acceleration sensor. The cause of this result is assumed not process problem, but the structure designed by simulation isn't suitable already. Threfore, the characteristics of parameters of the acceleration sensor that will be fabricated by 2nd-process is simulated by SuperSAP finite-element package. The determined parameter values of beam length, beam width, beam thickness, mass, and mass radius are 120 ㎛, 5 ㎛, 1.0 ㎎, and 700 ㎛, respectively. We fabricated 8-beam bridge-type acceleration sensor by batch-process using a semiconductor process technique, proof-mass fabrication method, and micromachinig using selective diffusion.
One-step synthesis of gene carrier via gamma irradiation and its application in tumor gene therapy
Jeong, Sung In,Park, Seong-Cheol,Park, Sun-Jeong,Kim, Eun-Ji,Heo, Hun,Park, Jong-Seok,Gwon, Hui-Jeong,Lim, Youn-Mook,Jang, Mi-Kyeong DOVE MEDICAL PRESS 2018 INTERNATIONAL JOURNAL OF NANOMEDICINE Vol.13 No.-
<P><B>Introduction</B></P><P>Although numerous studies have been conducted with the aim of developing drug-delivery systems, chemically synthesized gene carriers have shown limited applications in the biomedical fields due to several problems, such as low-grafting yields, undesirable reactions, difficulties in controlling the reactions, and high-cost production owing to multi-step manufacturing processes.</P><P><B>Materials and methods</B></P><P>We developed a 1-step synthesis process to produce 2-aminoethyl methacrylate-grafted water-soluble chitosan (AEMA-g-WSC) as a gene carrier, using gamma irradiation for simultaneous synthesis and sterilization, but no catalysts or photoinitiators. We analyzed the AEMA graft site on WSC using 2-dimensional nuclear magnetic resonance spectroscopy (2D NMR; 1H and 13C NMR), and assayed gene transfection effects in vitro and in vivo.</P><P><B>Results</B></P><P>We revealed selective grafting of AEMA onto C6-OH groups of WSC. AEMA-g-WSC effectively condensed plasmid DNA to form polyplexes in the size range of 170 to 282 nm. AEMA-g-WSC polyplexes in combination with psi-hBCL2 (a vector expressing short hairpin RNA against <I>BCL2</I> mRNA) inhibited tumor cell proliferation and tumor growth in vitro and in vivo, respectively, by inducing apoptosis.</P><P><B>Conclusion</B></P><P>The simple grafting process mediated via gamma irradiation is a promising method for synthesizing gene carriers.</P>
A case of spontaneous hemoperitoneum by uterine vessel rupture in pregnancy
( Jeong Hui Jang ),( Kyu-sang Kyeong ),( Seolmin Lee ),( Seung-hwa Hong ),( Ilwoon Ji ),( Eun-hwan Jeong ) 대한산부인과학회 2016 Obstetrics & Gynecology Science Vol.59 No.6
A 27-year-old pregnant woman, para 1, was transferred to our hospital at 29+3 weeks of gestation complaining of abdominal pain. She was diagnosed with hemoperitoneum based on ultrasonography. An emergency laparotomy was performed, and the bleeding was confirmed to be caused by ruptured surface blood vessels on the uterine fundus. Hemostasis with compression was successfully performed to sustain the pregnancy, and the patient delivered a full-term baby. Spontaneous hemoperitoneum during pregnancy caused by rupture of uterine blood vessels is very rare. It requires rapid diagnosis and surgical treatment because it increases the morbidity of the fetus and mother. In most incidences of spontaneous hemoperitoneum during pregnancy, a cesarean delivery is performed along with a simultaneous emergency laparotomy. However, in this case, the pregnancy was maintained to full term after surgical hemostasis, which prevented neonatal complications due to premature birth.
단일 융모막 쌍태아에서 한쪽 태아의 터너 증후군 증례 보고
장정희 ( Jeong Hui Jang ),경규상 ( Kyu Sang Kyeong ),홍덕호 ( Deok Ho Hong ),홍승화 ( Seung Hwa Hong ),지일운 ( Il Woon Ji ),정은환 ( Eun Hwan Jeong ) 대한주산의학회 2014 Perinatology Vol.25 No.4
Monochorionic twins with discordant karyotypes are rare and mostly caused by post-zygotic mitotic nondisjunction. A 32 year old nulliparous woman at 11 weeks of gestation with spontaneous twin pregnancy wasreferred to our hospital. An amniocentesis was performed in both amniotic sacs at 15 weeks of pregnancy. Onefetus in monochorionic twin pregnancy was diagnosed with Turner syndrome with cystic hygroma, and theother fetus was normal. Because of high mortality rate in abnormal fetuses, the umbilical cord coagulation wasperformed using radiofrequency ablation to prevent the damage of co-twin that may be caused by the demiseof one fetus. After delivery, chorionicity of placenta was ascertained by pathologic exam. Postnatal findings ofphysical exam, abdominal and brain sonography were normal in the surviving neonate.
다이캐스팅 모바일 기기의 기공결함 감소를 위한 유동구조 설계
장정희(Jeong Hui Jang),김준형(Jun Hyung Kim),한철호(Chul Ho Han) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.2
Usually, the die-cast components used in small mobile devices require finishing processes, such as computer numerically controlled coating. In such cases, porosity is the most important defect. The shape of the molten aluminum that passes through the runner and gate in a mold is the one of the factors that influences gas porosity. To define the spurt index, which numerically indicates the shape of molten aluminum after the gate, Reynolds number and Ohnesorge number are used. Before die fabrication, computer-aided engineering analysis is performed to optimize the filling pattern. Finally, X-ray and surface inspection are performed after casting and machining to evaluate how the spurt index affects porosity and other product parameters. Based on the results obtained herein, a new gating system design process is suggested.