SF₆계 혼합가스의 뇌임펄스 절연파괴특성

서호준,이동희,Seo, Ho-Joon,Rhie, Dong-Hee 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.7

$SF_6$ is widely used as gas insulation medium because of having excellent dielectric and arc-quenching properties. However the use of it is getting to be suppressed from the viewpoint of mitigating global warming. For the development of environmentally-benign electric power equipment and system, novel gases or mixture gases are strongly required as the substitute of $SF_6$ gas. In this study the authors constructed an experimental system to investigate insulation properties of the mixed gases composed of negative $gas(SF_6)$ and electron deceleration gases$(N_2\;and\;CO_2)$. Breakdown and prebreakdown characteristics of $SF_6/N_2/CO_2$ mixture gases were investigated using the above mentioned system for different rates and gas pressures.

교통사고에 의한 외상 후 스트레스장애 환자의 피부 전기반응 : 예비 연구

서호준,정영은,이혜원,문현진,박주미,김선경,채정호,Seo, Ho-Jun,Jung, Young-Eun,Lee, Hye-Won,Moon, Hyun-Jin,Park, Ju-Mi,Kim, Seon-Kyung,Chae, Jeong-Ho 대한불안의학회 2007 대한불안의학회지 Vol.3 No.2

Objective : In the present study, we evaluated the differences between the skin electric conductance of patients with posttraumatic stress disorder (PTSD) and normal controls in order to determine the possibility of using skin electric conductance as a diagnostic measure. Method : The PTSD group included 14 subjects who were diagnosed with PTSD in St. Mary's Hospital after a motor vehicle accident, and the normal control group included 12 healthy subjects. The conductivity and capacitance of both groups were measured twice, and the data from each group was compared. Results : There was no significant difference in gender, but the patients in the PTSD group were significantly older than those in normal control group. The activity (conductivity) between the left head-left hand, right hand-right head, and right head-left head was significantly elevated in the PTSD group as compared with the normal control group. In addition, the reactivity (capacitance) between the right head-left head, left head-left hand, right hand-left hand, right hand-right foot, right foot-left foot, and left foot-left hand was significantly elevated in the PTSD group. Conclusion : In this study, the skin electric conductance of the patients with PTSD was significantly elevated in comparison with that of the healthy subjects. Although there were some limitations of this study, the results of this study suggested that skin electric conductance can be used to evaluate elevated psychophysiological responses in patients with PTSD. Future studies with more subjects and more structure are needed in order to confirm our results.

Na⁺/MgO 촉매상에서 메탄의 Oxidative Coupling 반응의 속도론적 해석

서호준,선우창신,유의연,Seo, Ho-Joon,Sunwoo, Chang-Shin,Yu, Eui-Yeon 한국공업화학회 1994 공업화학 Vol.5 No.4

The oxidative coupling of methane was studied kinetically using $Na^+(50wt%)/MgO$ catalyst at 710, 730, 750, 770 and $790^{\circ}C$ in a fixed bed flow reactor at the atmospheric pressure under differential conversion conditions. Through curve fitting, it was found that the Langmuir-Hinshelwood type mechanism was fitted to this reaction rather than Rideal-Redox type or Eley-Rideal type mechanism. Therefore, it was proposed that the $O_2{^-}$ or $O_2{^{2-}}$ species on the surface was related to the production of $CH_3{\cdot}$. The estimated activation energy of $CH_3{\cdot}$ production was about 39.3kcal/mol. Moreover, as the result of curve fitting, the stoichiometric coefficient of $O_2$ for the production of $CH_3{\cdot}$ to produce $CO_x$was approximately 1.5. Accordingly, it could be concluded that the $CH_3O_2{\cdot}*$ was prouduced through the partial oxidation of $CH_3{\cdot}$ with the surface oxygen. 고정층 상압 유통식 반응기에서 메탄의 전화율 10% 미만의 범위에서 $Na^+(50wt%)/MgO$ 촉매를 사용하여 반응온도 710, 730, 750, 770, $790^{\circ}C$에서 메탄과 산소의 분압을 변화시켜 가면서 메탄의 oxidative coupling반응을 수행하여 이산화탄소와 에탄의 생성속도를 구하고 curve fitting으로 속도식을 증명하였다. Langmuir-Hinshelwood, Rideal-Redox, Eley-Rideal형 반응 메카니즘 중에서 Langmuir-Hinshelwood형 반응 메카니즘이 실험 결과와 가장 잘 일치하였으며, $CH_3{\cdot}$의 생성에 관여하는 산소종은 촉매 표면의 $O_2{^-}$ 또는 $O_2{^{2-}}$으로 제시할 수 있었고, 이때의 활성화 에너지는 약 39.3kcal/mol이었다. 또한, curve fitting결과 $CO_x$을 생성하는 산소의 화학 양론계수 x는 약 1.5이었으며, 이로부터 $CH_3{\cdot}$의 일부가 표면산소에 의해서 산화반응을 거쳐 $CH_3O_2{\cdot}*$ 형성을 추측할 수 있었다.

외상후 스트레스장애의 평가 도구

서호준,김태석,채정호,Seo, Ho-Jun,Kim, Tae-Suk,Chae, Jeong-Ho 대한불안의학회 2010 대한불안의학회지 Vol.6 No.1

Even experienced clinicians have difficulties in diagnosing posttraumatic stress disorder (PTSD) exactly, due to its diverse clinical features, which vary according to individuals, traumas, and various comorbid psychopathologies, and its related compensation issues. It is usually mandatory for clinicians and researchers to use screening and assessment tools when diagnosing and evaluating PTSD. To date, research has developed numerous PTSD screening and assessment tools ; therefore one of the cardinal issues is to select the best of the various tools, the one most suitable for the clinician's or researcher's purposes. This article reviews several currently-available subjective and objective instruments for the diagnosis and evaluation of PTSD and groups them according to whether they are Diagnostic and Statistical Manual for Mental Disorders-Correspondent Measures ; PTSD-Focused, Non-DSM-Correspondent Measures ; or Empirically Derived Measures. We present the instruments' psychometric properties and scoring methods and describe their merits and weak points, focusing on their practical usage.

연구논문 - 무기 / 촉매 : Akali - Metal / MgO 촉매상에서 메탄의 Oxidative Coupling 반응

서호준,유의연 ( Ho Joon Seo,Eui Yeon Yu ) 한국공업화학회 1993 한국공업화학회 연구논문 초록집 Vol.1990 No.3

플래시 액션스크립트 기반의 컴퓨터 시스템 구조 가상 학습실 개발

서호준,Seo Ho-Joon 한국공학교육학회 2004 공학교육연구 Vol.7 No.4

According to the appearance of various virtual websites using multimedia technologies for engineering education, the internet applications in engineering education have drawn much interests. But unidirectional communication, simple text/image based webpages and tedious learning process without motivation etc. have made the lowering of educational efficiency in cyberspace. Thus, to cope with these difficulties this paper presents a web-based educational Flash movies based on ActionScript language for understanding the principles of the computer system architecture. The proposed Flash movies provides the improved learning methods which can enhance the interests of learners. The results of this paper can be widely used to improve the efficiency of cyberlectures in the cyber university. Several sample Flash movies are illustrated to show the validity of the proposed learning method. 본 논문에서는 컴퓨터 내부 신호 전달 체계를 정확히 묘사할 수 있는 플래시 애니메이션과 교수자와 학습자 간의 상호 작용성이 뛰어난 플래시 프로그래밍 언어인 액션스크립트를 이용하여 가상학습실을 구축하였다. 제안한 가상학습실은 학습자 스스로 애니메이션을 조작하는 방식을 도입하여 사용자가 직접 입력한 키보드 또는 마우스 값에 따라 적절히 반응하는 비선형 애니메이션을 구현하여 자율적인 학습이 발생하도록 플래시 액션 스크립트 기반의 가상학습실을 구현하였다.

Na+ / MgO 촉매상에서 메탄의 Oxidative Coupling 반응의 속도론적 해석

서호준,선우창신,유의연 ( Ho Joon Seo,Chang Shin Sunwoo,Eui Yeon Yu ) 한국공업화학회 1994 공업화학 Vol.5 No.4

고정층 상압 유통식 반응기에서 메탄의 전화율 10% 미만의 범위에서 Na^+(50wt%)/MgO 촉매를 사용하여 반응온도 710, 730, 750, 770, 790℃에서 메탄과 산소의 분압을 변화시켜 가면서 메탄의 oxidative coupling 반응을 수행하여 이산화탄소와 에탄의 생성속도를 구하고 curve fitting으로 속도식을 증명하였다. Langmuir-Hinshelwood, Rideal-Redox, Eley-Rideal형 반응 메카니즘 중에서 Langmuir-Hinshelwood형 반응 메카니즘이 실험 결과와 가장 잘 일치하였으며, CH₃.의 생성에 관여하는 산소종은 촉매 표면의 O₂^- 또는 O₂^(2-)으로 제시할 수 있었고, 이때의 활성화 에너지는 약 39.3㎉/㏖이었다. 또한, curve fitting결과 CO_x을 생성하는 산소의 화학 양론계수 x는 약 1.5이었으며, 이로부터 CH₃·의 일부가 표면산소에 의해서 산화반응을 거쳐 CH₃O₂·* 형성을 추측할 수 있었다. The oxidative coupling of methane was studied kinetically using Na^+( 50wt% )/MgO catalyst at 710, 730, 750, 770 and 790℃ in a fixed bed flow reactor at the atmospheric pressure under differential conversion conditions. Through curve fitting, it was found that the Langmuir-Hinshelwood type mechanism was fitted to this reaction rather than Rideal-Redox type or Eley-Rideal type mechanism Therefore, it was proposed that the O₂^- or O₂^(2-) species on the surface was related to the production of CH₃.. We estimated activation energy of CH₃. production was about 39.3㎉/㏖. Moreover, as the result of curve fitting, the stoichiometric coefficient of O₂for the production of CH₃· to produce CO_x was approximately 1.5. Accordingly, it could be concluded that the CH₃O₂·* was produced through the partial oxidation of CH₃· with the surface oxygen.

공황장애 인지행동치료의 최신 지견

서호준,이강수,이상혁,서호석,Seo, Ho-Jun,Lee, Kang-Soo,Lee, Sang-Hyuk,Suh, Ho-Suk 대한불안의학회 2016 대한불안의학회지 Vol.12 No.1

30% of patients with panic disorder (PD) show treatment-resistant and chronic waxing and waning course. Therefore, adequate treatment strategies for PD by evidence based pharmacotherapy and combined cognitive behavioral therapy (CBT) are recommended. Regarding how and why CBT for PD works, three hypotheses include the cognitive theory, anxiety control theory, and behavioral theory were discussed. The recent findings that the altered activation in frontal lobe is normalized after CBT, suggest a reduction of an altered top-down fear processing in the neural correlates of CBT in PD. In order to improve accessibility to CBT, brief CBT and internet based CBT for PD were suggested. Despite limitations of sample sizes and study design, most of studies suggest that brief CBT is more effective than control conditions, and even as equally effective as standard CBT. The evidences suggest that internet based CBT may not be significantly different from face-to-face CBT in reducing anxiety. Several advances within the field of third-wave CBT for PD have led to the development of new techniques based on mindfulness, such as mindfulness-based cognitive therapy and acceptance and commitment therapy. Based on Korean algorithm project for panic disorder, especially the psychological education and cognitive reconstruction components were recommended in CBT with PD.

Pd/Ti-SPK과 Pd/Zr-SPK 촉매상에서 수소 생산을 위한 메탄의 부분산화반응과 촉매의 특성화

서호준 ( Ho Joon Seo ),강웅일 ( Ung Il Kang ) 한국공업화학회 2010 공업화학 Vol.21 No.6

고정층 상압 흐름 반응기에서 메탄의 부분산화반응을 수행하여 메탄으로부터 수소제조 위한 촉매의 활성도를 평가하였고, BET, XPS, XRD를 사용하여 촉매의 특성을 분석하였다 Pd(5)Ti-SPK과 Pd(5)/Zr-SPK 촉매의 BET 표면적, Horvath-Kawaze의 기공부피와 기공폭, t-플롯 미세기공 면적과 부피는 각각 284 m2/g, 0.233 cm3/g, 3.9 nm, 30 m2/g, 0.015 cm3/g과 396 m2/g, 0.324 cm3/g, 3.7 nm, 119 m2/g, 0.055 cm3/g이었다. 촉매는 히스테리시스가 잘 발달된 IV형 임을 N(2)-흡착등온선으로부터 확인할 수 있었다. XPS분석으로부터 SPK에 Ti와 Zr이 부분 치환된 Ti-SPK과 Zr-SPK의 Si 2p과 O Is 피크는 SPK의 Si 2p와 O Is 피크 보다 낮은 결합에너지 쪽으로 화학 이동함을 알 수 있었고, 촉매표면의 Pd의 산회상대는 Pd(0)와 Pd(+2)이었다. XRD의 결정 피크는 반응 전에 무정형인 촉매가 반응 후에는 결정상으로 변함을 보여주었다. Pd(5)Ti-SPK과 Pd(5)/Zr-SPK 촉매의 메탄의 전화율과 수소의 선택도는 973 K, CH(4)/O(2) = 2, GHSV = 8.4 x 10(4) mL/g(cat)·h 반응조건에서 각각 77,84%와 78,72%이었고, 반응 시작 후 3일까지도 촉매의 활성이 거의 일정하게 유지되었다 Pd(5)/Ti-SPK과 Pd(5)/Zr-SPK 촉매는 메탄의 부분산화반응에서 활성도와 열 안정성 및 물리화학적 성질이 우수하였다. Catalytic activities of the partial oxidation of methane (POM) to hydrogen were investigated over Pd(5)Ti-SPK and Pd(5)Zr-SPK in a fixed bed flow reactor (FBFR) under atmosphere, and the catalysts were characterized by BET, XPS, XRD. The RET surface areas, pore volume and pore width of Horvath-Kawaze, micro pore area and volume of t-plot of Pd(5)Ti-SPK and Pd(5)Zr-SPK were 284 m2/g, 0.233 cm3/g, 3.9 nm, 30 m2/g, 0.015 cm3/g and 396 m2/g, 0324 cm3/g, 3.7 nm, 119 m2/g, 0.055 cm3/g, repectively. The nitrogen adsorption isotherms were type IV with hysteresis. XPS showed that Si 2p and O Is core electronlevels of Ti-SPK and Zr-SPK substituted Ti and Zr shifted to slightly lower binding energies than SPK. The oxidation states of Pd on the surface of catalysts were Pd(0) and Pd(+2). XRD patterns showed that crystal structures of fresh catalyst changed amorphous into crystal phase after reaction. The conversion and selectivity of POM to hydrogen over Pd(5)/Ti-SPK and Pd(5)/Zr-SPK were 77,84% and 78,72%, respectively, at 973 K, CH(4)/O(2) = 2, GHSV = 8.4 × 10(4) mL/g(cat)·h and were kept constant even after 3 days in stream. These results confirm superior activity, thermal stability, and physicochemical properties of catalyst in POM to hydrogen.

신경 회로망을 이용한 유도 전동기의 전류제어

서호준 ( Ho Joon Seo ),김성환 ( Seong Hwan Kim ),박귀태 ( Gwi Tae Park ) 고려대학교 공학기술연구소 1998 공학논문집 Vol.36 No.1

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