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정형모,이정환(Lee, Jeong-Hwan),박태훈(Park, Tae-Hun),하태준(Ha, Tae-Jun) 대한교통학회 2006 대한교통학회 학술대회지 Vol.53 No.-
문명과 사회가 발전함에 따라 사람 및 물자의 이동량이 증가하여 왔고 이러한 이동량의 증가로 보다 안전하고 경제적인 도로의 필요성이 요구되고 있다. 급증하는 교통량과 교통사고의 증가는 현재 중요한 사회문제로 대두되었고, 수많은 사람들이 교통사고로 인명피해를 입고 있어 신종 재앙중의 하나라고도 일컬어지기도 한다. 교통안전분야의 연구는 생명과 관련된 분야로써 다른 어떤 연구 분야보다도 우선시 되어야 한다. 이런 측면에서 근래에 안전 분야의 중요성을 인식하고, 이 분야에 대한 관심과 중요성이 증대되고 있는 것은 대단히 고무적인 일이라 할 수 있다. 터널구간은 기본구간에 비하여 운전자의 주행속도에 변화가 생기는 구간이며 이러한 주행속도의 변화는 사고율과 관계가 깊다. 또한 터널 내에서 사고가 발생하면 대규모 지체를 초래할 뿐만 아니라 연쇄사고로 이어질 수도 있는 등 대형사고의 위험이 따르게 된다. 하지만 터널 부근의 부속시설물은 터널입구, 혹은 터널 출구에 설치하고 있으나 특별한 설치기준이나 방법이 제시되어 있지 않아, 터널 부근의 도로 설계가 일관성이 없는 실정이다. 본 연구에서는 터널부근의 교통사고를 분석하고, 3차원 시거를 계산하여 터널부속시설물의 적정한 위치를 제시하고자 한다.
Flexible, Tunable, and High Capacity Ultracapacitor using Nitron-Doped Graphene
정형모(Jeong, Hyung Mo),신원호(Shin, Weon Ho),최윤정(Choi, Yoon Jeong),강정구(Kang, Jeung Ku),최장욱(Choi, Jang Wook) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
We developed a simple method to synthesis a nitrogen doped graphene, nitrogen plasma treated graphene (NPG) sheets thought nitrogen plasma etching of graphene oxide (GO). X-ray photo electron spectroscopy (XPS) study of NPG sheets treated at various plasma conditions reveal that N-doping is classified to 3 kinds of binding configurations. The nitrogen doping concentration is at least 1.5 at % and up to 3 at% with changing of ratio of nitrogen configuration in NPG. Our group demonstrate ultracapacitor with high capacity and extremely durable using a NPG sheets that are comparable to pristine graphene supercapacitor, and pseudocapacitor using polymer and metal oxide with redox reaction, capacitance that are three-times higher, and a cycle life that are extremely stable. We also realized flexible capacitor by using the paper electrode that are coated by NPG sheets. NPG paper capacitor presented almost same performance compare with NPG on a metal substrate, and durability is much more enhanced than that. To additionally explain that how different kind of atoms in graphene layers can act as the ion absorption sites, we simulated the binding energy between nitrogen in graphene layer and ions in electrolyte. Increasing the energy density and long cycle life of ultracapacitor will enable them to compete with batteries and conventional capacitors in number of applications.
폐동정맥기형(Pulmonary Arteriovenous Malformation) 환자의 뇌농양제거술, 대퇴골 개방정복 및 내고정술, 복강경하 담낭절제술 시 마취관리 경험
정형모 ( Hyungmo Jeong ),강종만 ( Jong-man Kang ) 경희대학교 경희의료원 2017 慶熙醫學 Vol.32 No.1
Pulmonary arteriovenous malformation(PAVM) are caused by abnormal direct communications between pulmonary arteries and veins. Common clinical signs of PAVM are epistaxis, dyspnea, hypoxia, cyanosis and clubbing fingers by an intrapulmonary right to left shunt of the circulating blood without gas exchange. And neurological events like brain abscess and cerebral infarction are occurred by a paradoxical embolism across the PAVM. Thus, A comprehensive understanding of the PAVM should be considered to maintain the hypoxic pulmonary vasoconstriction response during general anesthesia and to reduce the intrapulmonary right to left shunt fraction. We report a rare case of a patient with PAVM who received three surgical procedures under general anesthesia. There were various patterns of each general anesthesia, and the patient was expired one week after the last surgery.
정무헌(Mu Heon Jeong),김윤정(Yoon Jeong Kim),정형모(Hyung Mo Jung),김선규(Sun-Gyu Kim),이선재(Sun Jai Lee) 한국화재소방학회 2020 한국화재소방학회논문지 Vol.34 No.5
본 연구의 목적은 소방대상물에서 이뤄지는 소방훈련의 실태를 고찰하는 것이다. 이를 위해 소방안전관리자 642명과 경험이 풍부한 소방공무원 212명을 대상으로 설문조사를 진행하였다. 설문은 소방훈련의 주기적 실시여부, 필요성, 훈련수준, 훈련방식, 훈련효과, 중점 훈련내용, 소방훈련이 재난대비·대응에 미치는 영향, 소방안전관리자와의협업 등에 대한 내용으로 구성되었다. 조사결과를 통해 현재 행해지는 소방훈련의 실태를 파악할 수 있었으며, 소방훈련의 취약점과 시사점을 도출해 낼 수 있었다. 결론에서는 조사결과에 대해 논의하고, 향후 연구의 발전방향을 제시하였다. The purpose of this study was to examine the actual state of fire drills in buildings. To this end, surveys of 642 firesafety managers and 212 experienced fire-fighters were conducted. The questionnaire covered the necessity of fire drills,excellence, level, training methods, training effects, key training contents, effects of fire drills on disaster preparedness andresponse, and collaboration with fire safety managers. Through the survey results, it was possible to comprehend the currentsituation of fire drills, which, in turn, helped identify weaknesses and areas of improvement in fire drills. In the conclusionsection, the results of the investigation were discussed and the direction of future development was suggested.
Sol-gel 법을 이용한 코어-쉘 실리카-형광체의 제조 및 특성평가
신원호,김세윤,정형모,Shin, Weon Ho,Kim, Seyun,Jeong, Hyung Mo 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.1
Cost-effective functional phosphor nanoparticles are prepared by introducing low-cost $SiO_2$ spheres to rare-earth phosphor ($YVO_4:Eu^{3+}$, $YVO_4:Er^{3+}$, and $YVO_4:Nd^{3+}$) shells using a sol-gel synthetic method. These functional nanoparticles are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and general photoluminescence spectra. The $SiO_2$ sphere occupying the interior of the conventional phosphor is advantageous in significantly reducing the cost of expensive rare-earth phosphor nanoparticles. The sol-gel process facilitates the core-shell structure formation; the rare-earth shell phosphor has strong interactions with chelating agents on the surfaces of $SiO_2$ nanoparticles and thus forms layers of several nanometers in thickness. The photoluminescence wavelength is simply tuned by replacing the active materials of $Eu^{3+}$, $Er^{3+}$, and $Nd^{3+}$. Moreover, the photoluminescent properties of the core-shell nanoparticles can be optimized by manipulating the specific contents of active materials in the phosphors. Our simple approach substitutes low-cost $SiO_2$ for expensive rare-earth-based phosphor materials to realize cost-effective phosphor nanoparticles for various applications.
자성 및 발광 특성이 조절 가능한 다기능 코어/중간체/쉘 나노 입자 합성
김문경,김세윤,문경석,신원호,정형모,Kim, Mun-Kyoung,Kim, Seyun,Moon, Kyoung-Seok,Shin, Weon Ho,Jeong, Hyung Mo 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.6
Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>/YVO<sub>4</sub>:Eu<sup>3+</sup> multifunctional nanoparticles are successfully synthesized by facile stepwise sol-gel processes. The multifunctional nanoparticles show a spherical shape with narrow size distribution (approximately 40 nm) and the phosphor shells are well crystallized. The Eu<sup>3+</sup> shows strong photoluminescence (red emission at 619 nm, absorbance at 290 nm) due to an effective energy transfer from the vanadate group to Eu. Core-shell structured multifunctional nanoparticles have superparamagnetic properties at 300 K. Furthermore, the core-shell nanoparticles have a quick response time for the external magnetic field. These results suggest that the photoluminescence and magnetic properties could be easily tuned by either varying the number of coating processes or changing the phosphor elements. The nanoparticles may have potential applications for appropriate fields such as laser systems, optical amplifiers, security systems, and drug delivery materials.
신원호(Shin, Weon Ho),정형모(Jeong, Hyung Mo),최윤정(Choi, Yoon Jeong),강정구(Kang, Jeung Ku) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
One-dimensional nanostructures such as carbon nanotubes could be ideal templates for formation of metallic nanoparticles. Furthermore, bimetallic component nanoparticles have recently been interesting issues for having high catalytic activity. This work provides both a facile method to synthesize bimetallic catalysts via N atoms of carbon nanotubes and also a picture about how to design the optimal bimetallic catalyst for hydrogen generation from the hydrogen storage material. In principle, the ratio of one component to another component could be generically extended to fabricate the high-performance bimetallic catalysts on host nanostructures. Indeed, we demonstrate that the bimetallic catalyst composed of the optimum composition results in the excellent hydrogen generation property from an aqueous borane ammonia solution, thus being capable of satisfying the Depart of Energy in USA target required for many advanced applications even with the small amount of our bimetallic catalysts attached onto the N-doped carbon nanotubes. This high hydrogen generation rate is found to be attributed to the optimal distance between active Pt and cheap Ni atoms for effective hydrogen generation.