Vacuum Squeeze 조형기(造型機)

박성하,안주수 한국주조공학회 1988 한국주조공학회지 Vol.8 No.2

목 자세에 따른 선 자세에서의 신체균형능력 평가

박성하 한국산업경영시스템학회 2018 한국산업경영시스템학회지 Vol.41 No.2

Postural instability can increase the likelihood of hazardous slip and fall accidents in workplaces. The present study intended to extend understanding of the effect of abnormal neck posture on postural control during quiet standing. The effect of body fatigue on the postural control was also of primary concern. Twelve healthy undergraduate students volunteered to participate in the experiment. Standing on a force platform with the neck neutral, flexed, extended, or rotated, subjects’ center of pressures (COP) were measured under the two levels of body fatigue. For the fatigue condition, Subjects exercised in a treadmill to meet the predetermined level of body fatigue. Analyzing the position coordinates of COPs, the length of postural sway path was assessed in both medio-lateral (ML) axis and anterior-posterior (AP) axis. Results showed that, in AP direction, neck extension or rotation significantly increased the sway length as compared with neck neutral. Neck extension led to greater sway length compared to neck rotation. Neck flexion did not differ from neck neutral. The sway length in the AP direction also became significantly larger as the body fatigue accumulated after treadmill exercise. In ML direction, as compared to neutral posture, the neck extension, flexion, or rotation did not significantly affect the length of postural sway path. However, the sway length seemed to increase marginally with the neck extended during the fatigued condition. This study demonstrates that abnormal neck posture may interfere with postural control during standing. The ability to maintain postural stability decreases significantly with the neck extended or rotated. Body fatigue leads to postural instability further.

연속교반 반응기를 사용한 Bitumen의 수첨접촉분해

박성하 大田産業大學校 1997 한밭대학교 논문집 Vol.14 No.1

Bitumen by catalytic hydrocracking was studied in CSTR(Continous Stirred Tank Reaetor) with conventional catalysts of Mo-Co/Al_2O_3 and Ni-Mo/Al_2O_3. In the hydrocraching of bitumen, the kind of catalysts did not seem to influence the distribution of gaseous products in which C_3 and C_4 fraction were predomine-nt, whereas C_1 and C_2 fractions in noncatalytic cracking. In the liquid products, naphtha fraction was increased with temperature, whereas fuel oil fraction was decreased. The distillate fraction was relatively Invariant wi-th respect to temperature. The amount of hydrogen consumed increased with temperature and resisdence ti-me, however, it was very same even when the catalysts are present or not. The formation of coke in the hydrocracking ocurred at a temperature larger than 440 ℃ and LHSY less than 1.

Fabrication methods and applications of DNA nanostructures

박성하 한국고분자학회 2013 한국고분자학회 학술대회 연구논문 초록집 Vol.2013 No.4

An Empirical Comparative Study on International Cooperation in Nuclear Safety between Korea and Japan: Focusing on East Asian Nuclear Safety Cooperation

박성하 한국일본학회 2022 日本學報 Vol.- No.130

The current thesis, through empirical research, aims to understand the perceptional status of the international cooperation of nuclear safety between Korea and Japan after the Fukushima nuclear accident in 2011. In this context, the thesis also provided some applicable suggestions which could help develop an appropriate international cooperation system and nuclear safety policy. Results showed that there was a marked difference in perception between the Korean and Japanese nuclear power experts regarding international cooperation for nuclear safety. It was confirmed that international cooperation between neighboring countries was ineffective. This is because the countries are not aware of the possible nuclear threats from their neighboring countries, instead they considered it to be a problem for others and not related to their own safety. In particular, there was a very negative perception in Japan of the establishment of regional safety organizations and the setting of common goals and safety standards. The common perception of domestic people was that if the domestic nuclear power plants are safe, there is nothing to worry about the safety and possible threats from the nuclear power plants in the neighboring countries. However, since a nuclear accident in a neighboring country can cause damage to one's own country, international cooperation in nuclear safety among East Asian countries should be promoted.

의과대학에서의 학습과 의사국가시험 수험태도

朴聖河 대한의학협회 1995 대한의학협회지 Vol.38 No.5

DNA Nanostructures and their Applications

박성하 한국고분자학회 2015 한국고분자학회 학술대회 연구논문 초록집 Vol.2015 No.10

‘필연성(necessity)’ 양태를 나타내는 성분의 문법화 및 유형학적 특성 연구 - 중국지역 소수민족 언어를 중심으로

박성하 한국중어중문학회 2022 中語中文學 Vol.- No.89

본 논문은 언어유형론적인 관점에서 중국지역 소수민족 언어 30개를 대상으로 ‘필연성(necessity)’을 나타내는 문법 성분에 대해 분석한 연구이다. 대체적인 내용은 다음과 같다. 첫째, ‘필연성’ 성분과 동사와의 어순 및 문장에서의 구현방식에 대해 살펴보았는데, ‘필연성’ 성분과 동사와의 어순은 어족 분포와 정확하게 일치했으며, 구현방식은 동사와의 어순과 상당히 밀접한 관련이 있음을 알 수 있었다. 둘째, ‘필연성’ 성분과 주로 공기하여 쓰이는 성분 및 통사적인 특성에 대해 살펴보고, 또한 주목해서 볼만한 사례를 발굴하여 제시하였다. 셋째, ‘필연성’ 성분의 다름 쓰임 즉, ‘미래’로 쓰인 경우와 ‘조건법적 서술’로 쓰인 사례들을 살펴보았다. 넷째, 중국지역 내 언어라는 지리적인 특성으로 인한 요소 또한 간과할 수 없는 요인으로 한어에서 차용된 ‘필연성’ 성분에 대해서도 살펴보았다. 마지막으로 본고의 분석 내용을 토대로 중국지역 소수민족 언어의 ‘필연성’ 성분들의 표현 양상 및 문법화 경로가 얼마나 언어보편성에 부합되는지 살펴보고, 아울러 지역유형론적인 특성에는 어떤 것들이 있는지 살펴보았다.

Geant4를 이용한 STEIN 검출기의 입자 분리 검출 모의실험 예비 결과 분석

박성하,김용호,우주,선종호,진호,이동훈,Park, Seong-Ha,Kim, Yong-Ho,U, Ju,Seon, Jong-Ho,Jin, Ho,Lee, Dong-Hun 한국천문학회 2012 天文學會報 Vol.37 No.2

지구 자기권에 존재하는 플라즈마 입자의 다중관측을 목적으로 개발된 초소형 탑재체 STEIN (SupraThermal Electron, Ion, Neutral) 은 경희대학교와 UC Berkeley가 공동으로 개발 중인 3대의 초소형 과학위성 TRIO-CINEMA (TRiplet Ionosphere Observatory - Cubesat for Ion, Neutral, Electron and MAgnetic fields) 에 탑재될 입자 검출기이다. 32개의 픽셀로 이루어진 STEIN 검출기는 2~300 keV의 전자, 4~300 keV의 이온과 중성입자(Energetic Neutral Atom: ENA) 를 분리 계측할 목적으로 설계되었으며, 하전입자가 정전장 편향기를 통과하여 서로 다른 검출기 픽셀에 도달함으로써 전자와 이온, 중성입자를 분리하여 계측할 수 있도록 하였다. 한편, STEIN 구조물에서 발생한 2차 입자의 검출을 방지하기 위해 정전 편향기 사이에 차단날(blade)을 설계하였다. 본 연구에서는 STEIN 모의실험 예비 결과로써 전기장에 크기 및 차단날에 의한 하전입자의 궤적과 이에 따른 분리 계측 성능을 알아보고자 Geant4 (GEometry ANd Tracking)를 사용하여 검출기 픽셀에 입사하는 전자의 초기 위치를 분석하였다. 전자의 입사 위치는 검출기로부터 5 cm 전방에서 6 mm * 20 mm 범위 내에서 무작위로 생성하여 검출기의 방향으로 수직 입사하였다. 분석 결과 전자들은 전기장의 방향에 따라 편향되는 결과를 보였으며, 저에너지 전자는 강한 전기장의 영향으로 차단날에 의해 차폐되어 검출되지 않았다. 따라서 전기장의 크기와 차단날에 따른 입자 분리 검출이 가능함을 본 모의실험을 통해 확인하였으며, STEIN 운용 시 입자 분리 검출 및 결과 분석 기반으로 본 연구 결과를 사용될 수 있을 것으로 기대된다.

Role of Inflammation in the Pathogenesis of Arterial Stiffness

박성하,Edward G. Lakatta 연세대학교의과대학 2012 Yonsei medical journal Vol.53 No.2

Increased arterial stiffness is an independent predictor of cardiovascular disease independent from blood pressure. Recent studies have shed new light on the importance of inflammation on the pathogenesis of arterial stiffness. Arterial stiffness is associated with the increased activity of angiotensin II, which results in increased NADPH oxidase activity, reduced NO bioavailability and increased production of reactive oxygen species. Angiotensin II signaling activates matrix metalloproteinases (MMPs) which degrade TGFβ precursors to produce active TGFβ, which then results in increased arterial fibrosis. Angiotensin II signaling also activates cytokines, including monocyte chemoattractant protein-1, TNF-α, interleukin-1, interleukin-17 and interleukin-6. There is also ample clinical evidence that demonstrates the association of inflammation with increased arterial stiffness. Recent studies have shown that reductions in inflammation can reduce arterial stiffness. In patients with rheumatoid arthritis,increased aortic pulse wave velocity in patients was significantly reduced by anti tumor necrosis factor-α therapy. Among the major classes of anti hypertensive drugs, drugs that block the activation of the RAS system may be more effective in reducing the progression of arterial stiffness. Thus, there is rationale for targeting specific inflammatory pathways involved in arterial stiffness in the development of future drugs. Understanding the role of inflammation in the pathogenesis of arterial stiffness is important to understanding the complex puzzle that is the pathophysiology of arterial stiffening and may be important for future development of novel treatments.