RF-Sputted Vanadium Oxide Thin Films:Effect of Oxygen Partial Pressure on Structural and Electrochemical Properties

박용준,박남규,류광선,장순호,박신종,윤선미,김동국,Park, Yong Jun,Park, Nam Gyu,Ryu, Gwang Seon,Jang, Sun Ho,Park, Sin Jong,Yun, Seon Mi,Kim, Dong Guk Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.9

Vanadium oxide thin films with thickness of about 2000 $\AA$ have been prepared by radio frequency sputter deposition using a V2O5 target in a mixed argon and oxygen atmosphere with different Ar/O2 ratio ranging from 99/1 to 90/10. X-ray diffraction and X-ray absorption near edge structure spectroscopic studies show that the oxygen content higher than 5% crystallizes a stoichiometric V2O5 phase, while oxygen deficient phase is formed in the lower oxygen content. The oxygen content in the mixed Ar + O2 has a significant influence on electrochemical lithium insertion/deinsertion property. The discharge-charge capacity of vanadium oxide film increases with increasing the reactive oxygen content. The V2O5 film deposited at the Ar/O2 ratio of 90/10 exhibits high discharge capacity of 100 ${\mu}Ah/cm2-{\mu}m$ along with good cycle performance.

연구논문 - 생물 / 환경 : 용액상에서 고분자분해에 미치는 초음파의 영향

박용준,전법주,윤용수,정일현 ( Yong Joon Park,Bup Ju Jeon,Yong Soo Yoon,Il Hyun Jung ) 한국공업화학회 1994 한국공업화학회 연구논문 초록집 Vol.1990 No.3

²⁵²Cf 선원을 이용한 즉발감마선 계측시스템 구성

박용준,송병철,지광용,Park, Yong-Joon,Song, Byung-Chul,Jee, Kwang-Yong 한국분석과학회 2003 분석과학 Vol.16 No.1

$^{252}Cf$ 중성자 선원을 이용한 즉발감마선 계측 시스템 (NIPS, Neutron Induced Promp ${\gamma}$-ray Spectroscopy)을 설계 및 구성하기 위하여, 시스템내의 감속제 및 차폐체등의 효과를 시험하고 감마선 바탕값과 Cl을 포함한 시료의 즉발 감마선을 계측하였다. 이를 위한 예비시험으로 한국원자력연구소 내에 있는 TLD 판독용 $^{252}Cf$ 선원을 이용하였으며 즉발감마선은 시스템 내부의 동축형 HPGe (GMX, 60% relative efficiency)과 시스템외부 (약 20m 거리)의 Notebook PC 중성자와 감마선의 바탕값을 측정하고, 바탕값을 최소로 할 수 있는 차폐체의 기하학적 구조를 고안하였다. 감마선 바탕값을 최소화하기 위하여 두 개의 HPGe 검출기를 이용한 감마-감마 동시계측법을 이용하였다. 이 실험 자료를 이용하여 최적의 NIPS 시스템을 구성하였다. For the design and set-up of neutron induced prompt ${\gamma}$-ray spectroscopy system using $^{252}Cf$ neutron source, the effects of shielding and moderator materials have been examined. The $^{252}Cf$ source being used for TLD badge calibration in Korea Atomic Energy Research Institute was utilized for this preliminary experiment. The ${\gamma}$-ray background and prompt ${\gamma}$-ray spectrum of the sample containing Cl were measured using HPGe (GMX 60% relative efficiency) located at the inside of the system connected to notebook PC at the outside of the system (about 20 meter distance). The background activities of neutron and ${\gamma}$-rays were measured with neutron survey meter as well as ${\gamma}$-ray survey meters, respectively and the system was designed to minimize the activities. Prompt ${\gamma}$-ray spectrum was measured using ${\gamma}$-${\gamma}$ coincident system for reduce the background and the continuum spectrum. The optimum system was designed and set up using the experimental data obtained.

3차원 박막전지의 연구동향

박용준,Park, Yong-Jun 한국전기전자재료학회 2007 전기전자재료 Vol.20 No.12

TiN 기판 위에 성장시킨 비정질 BaSm₂Ti₄O₁₂ 박막의 구조 및 전기적 특성 연구

박용준,백종후,이영진,정영훈,남산,Park, Yong-Jun,Paik, Jong-Hoo,Lee, Young-Jin,Jeong, Young-Hun,Nahm, Sahn 한국재료학회 2008 한국재료학회지 Vol.18 No.4

The structural and electrical properties of amorphous $BaSm_2Ti_4O_{12}$ (BSmT) films on a $TiN/SiO_2/Si$ substrate deposited using a RF magnetron sputtering method were investigated. The deposition of BSmT films was carried out at $300^{\circ}C$ in a mixed oxygen and argon ($O_2$ : Ar = 1 : 4) atmosphere with a total pressure of 8.0 mTorr. In particular, a 45 nm-thick amorphous BSmT film exhibited a high capacitance density and low dissipation factor of $7.60\;fF/{\mu}m2$ and 1.3%, respectively, with a dielectric constant of 38 at 100 kHz. Its capacitance showed very little change, even in GHz ranges from 1.0 GHz to 6.0 GHz. The quality factor of the BSmT film was as high as 67 at 6 GHz. The leakage current density of the BSmT film was also very low, at approximately $5.11\;nA/cm^2$ at 2 V; its conduction mechanism was explained by the the Poole-Frenkel emission. The quadratic voltage coefficient of capacitance of the BSmT film was approximately $698\;ppm/V^2$, which is higher than the required value (<$100\;ppm/V^2$) for RF application. This could be reduced by improving the process condition. The temperature coefficient of capacitance of the film was low at nearly $296\;ppm/^{\circ}C$ at 100 kHz. Therefore, amorphous BSmT grown on a TiN substrate is a viable candidate material for a metal-insulator-metal capacitor.

이성분계 금속합금($MoRu_3$, $MoRh_3$)의 합성 및 구조분석

박용준,이종규,김종구,김정석,지광용,Park, Yong Joon,Lee, Jong-Gyu,Kim, Jong Goo,Kim, Jung Suk,Jee, Kwang-Yong 한국분석과학회 1998 분석과학 Vol.11 No.3

조사후 핵연료의 용해실험 다음에 잔류된 불용성 잔유물을 구성하는 Mo, Ru, Rh 등의 원소로 이루어진 이성분계 합금인 $MoRu_3$와 $MoRh_3$을 아르곤 아아크로를 이용하여 $1700^{\circ}C$ 이상의 고온에서 합성하였다. 이들 합금의 정확한 구조와 결정격자상수는 ICDD(International Centre for Diffraction Data)에서 제작되는 분말회절수집철(JCPDS files) 등에 수록된 바가 없다. X선 회절분석결과 이들 두 합금은 육방밀집구조와 $P6_3/mmc$의 공간군을 갖는 $WRh_3$의 구조와 매우 유사한 것으로 나타났다. 이 화합물들의 격자상수, a와 c는 최소자승법을 이용하여 구하였다. 또한 XPS로 분석을 통하여 이들의 표면을 조사한 결과 금속 표면이 실온에서 공기와 접촉하였을 때 여러 구성성분 중에서 Mo(0)가 Mo(6+)로 산화되는 것을 확인하였는데, 아르곤이온으로 표면을 15분 정도 sputtering 하여 Mo(6+)층을 제거할 수 있었다. 합금의 구성성분 중, Mo, Ru, Rh 원소에서 내부 전자들의 결합에너지에는 커다란 변화가 없는 것으로 나타났다. 이들 화합물들의 자화율을 측정해 본 결과 2~300 K 범위에서 전형적인 Pauli-paramagnetic 행동을 보여주었다. Binary alloys, $MoRu_3$ and $MoRh_3$, have been prepared using arc melting furnace. Mo and the noble metals Ru and Rh are the constituents of metallic insoluble residues, which were found in the early days of the post-irradiation studies on uranium oxide fuels. Detailed structural informations about these alloys have not been reported on JCPDS files of ICDD (International Centre for Diffraction Data). The results of X-ray diffraction study showed that the alloy was crystallized in hexagonal close-packing, well known as ${\varepsilon}$-phase. The X-ray diffraction patterns of these alloys matched well to that of $WRh_3$ with $P6_3/mmc$ of space group. The lattice parameters, a and c, were calculated using the least squares extrapolation. It was found from X-ray photoelectron spectroscopic measurements that Mo on the surface of the alloy was oxidized to Mo(6+), which could be removed by sputtering with Ar ions for approximately 15 minutes. The changes in binding energy of Mo, Ru, and Rh on the surface of the alloy were not observed. Magnetic susceptibility measurements resulted in the typical Pauli-paramagnetic behavior in the temperature range of 2 to 300 K.

대치3동 문화복지회관 건설사업관리 적용 사례분석

박용준,Park, Young-Jun 한국건설관리학회 2005 한국건설관리학회 논문집 Vol.6 No.6

폭넓은 활용가능성에 주목하라

박용준,Park, Yong-Jun 대한제과협회 1998 베이커리 Vol.5 No.-

우라닐 가수분해물의 용해도 연구

박용준,표형렬,김원호,전관식,Park, Yong-Joon,Pyo, Hyung-Ryul,Kim, Won-Ho,Chun, Kwan-Sik 대한화학회 1996 대한화학회지 Vol.40 No.9

서로 다른 pH 조건에서 생성한 우라닐 가수분해물의 용해도에 미치는 지하수 성분의 영향을 측정하였다. 우라닐 가수분해 침전물 pH 6.4 및 9.7에서 제조하였다. 편마암 층에서 채취한 지하수로부터 무기 및 유기콜로이드를 제거한 분리지하수, 채취지하수의 분석성분과 동일한 조성을 가지는 합성지하수, 그리고 0.1 M NaCl 수용액에서의 용해도에 미치는 pH의 영향을 측정하였다. 또한 채취지하수에서 상대적으로 다량 존재하는 음이온 및 양이온의 영향을 측정하였다. 지하수에서의 우라닐 가수분해 침전물의 용해도는 0.1 M NaCl 용액에서보다 약 100배 정도 큰 것으로 나타났다. X-선 회절분석 결과는 높은 pH에서 제조한 우라닐 가수분해 침전물이 낮은 pH에서 제조한 것보다 낮은 결정화도와 높은 용해도를 보였다. The effects of chemical species in groundwater on the solubility of the uranyl hydrolysis precipitates formed at pH 6.4 and 9.7 were investigated. Based on the chemical composition of the groundwater, the synthetic groundwater was prepared. The colloid-free (separated) groundwater was also prepared by removal of both organic and inorganic colloids from the sampled groundwater. Solubilities of precipitates formed in the hydrolysis of uranyl ion in groundwater, separated groundwater, synthetic groundwater and 0.1 M NaCl solution were measured over neutral to alkaline pH range, and especially, the effect of the anions and cations found in groundwater on the solubility was investigated. Solubility in groundwater was approximately two orders of magnitude greater than that in 0.1 M NaCl solution. Soubililties of uranyl hydrolysis precipitates formed at pH 9.7 and 6.4 were compared in groundwater and synthetic groundwater. Solubilities of the precipitates formed at different pH were found to be in the same order of magnitude in groundwater and synthetic groundwater, however the uranyl hydolysis precipitates formed at higher pH values showed a tendency of higher solubility.

WT1 유전자 돌연변이에 의해 선천성 가로막 탈장이 동반되고 조기 신부전이 초래된 선천성 신증후군 1례

박용준,오진원,최경민,김병길,이종인,송지선,Park, Yong-Jun,Oh, Jin-Won,Choi, Kyong-Min,Kim, Pyung-Kil,Lee, Jong-In,Song, Ji-Sun 대한소아신장학회 2009 Childhood kidney diseases Vol.13 No.1

저자들은 선천성 가로막 탈장을 동반한 선천성 신증후군 신생아에서 WT1 유전자 돌연변이와 범발성맥관막 경화증으로 진단하였기에 문헌 고찰과 함께 보고하는 바이다. 본 여아는 출생 직후 선천성 가로막 탈장이 발견되어 응급 교정수술을 받았고 전신부종, 핍뇨, 단백뇨, 저알부민혈증, 고뇨소질소혈증, 고크레아티닌혈증이 지속되어 선천성 신증후군에 의한 조기 신부전으로 진단되었다. 생후 22일째부터 복막투석 시작하였으나 뇌출혈과 다기관부전으로 생후 34일째 사망하였다. 사후 신생검에서 범발성 맥관막 경화증으로 확인되었다. 염색체 검사에서 정상소견(46,XX) 보였고 사후 유전자 검사에서 Arg366Hisin WT1 과오 돌연변이를 보였다. 본 예는 선천성 신증후군에 선천성 가로막 탈장이 동반된 드문 예로 WT1 유전자의 Arg366His 과오 돌연변이가 DDS와 CDH의 발생에 병인으로 관여할 것이라는 가설을 지지하는 4번째 증례라는 점에서 중요한 의미가 있다. We experienced a female neonate with congenital nephrotic syndrome (CNS) associated with congenital diaphragmatic hernia (CDH). Because of the rare combination of two conditions, we report this case with literature review. CDH was found immediately after birth and emergency operation was done for hernia repair. But on the next day, generalized edema and oliguria(0.59 mL/kg/hour) was found and her blood chemistry showed hypoalbuminemia (1.6 g/dL), increased BUN (27.7 mg/dL) and serum creatinine( 1.8 mg/dL) along with heavy proteinuria (4+). We started albumin infusion with a bolus of intravenous furosemide. We suspected the neonate had congenital nephrotic syndrome and her 24hr urine protein was 1,816 mg/day. In spite of immunosuppressive therapy, the nephrotic syndrome and renal failure progressed. We started peritoneal dialysis on the day of life 22 but it was not satisfactory. She was complicated by intracranial hemorrhage and multi-organ failure and expired at 34 days of age. Kidney necropsy was performed which showed diffuse mesangial sclerosis (DMS). Her chromosome study revealed 46, XX and her gene study revealed a heterozygous missense mutation, Arg366His, in Wilms tumor suppressor gene (WT1). This case deserves attention on account of the 4th case of CNS with CDH revealing the Arg366His mutation in the WT1 gene and G the 1st case of early onset renal failure without male pseudohermaphroditism and Wilms tumor with CNS, CDH and the Arg366His mutation in the WT1 gene. So, this report gives support to the hypothesis that Arg366His mutation in the WT1 gene can result in CNS and CDH.