대표적인 한국식품의 수출 현황 및 전망

박성훈,Park, Seong-Hun 한국식품연구원 2007 食品技術 Vol.20 No.2

대표적인 한국식품의 수출 현황 및 전망

박성훈,Park, Seong-Hun 한국식품산업협회 2007 좋은식품 Vol.197 No.-

이중 전이와 자화 상전이 : 초전도성에 대한 전자 유체의 응축 모델

박성훈,최동식,신두순,김원수,Park, Sung-Hoon,Choi, Dong-Seek,Shin, Doo-Soon,Kim, Won-Soo 대한화학회 1998 대한화학회지 Vol.42 No.6

산화물 초전도체 발견 후 많은 이론적 발전이 있었으나, 초전도 상전이를 정확히 설명하는 이론은 아직 없다 하겠다. 특히 상전이점 근처에서 발견되는 이중전이(double transition)나 다양한 자기적 상전이에 대해서는 아직 정확한 이해가 없는 상태이다. 본 논문에 서는 전자유체의 응축모델을 사용하여 초전도 전이에 있어서, 전자기체의 응축과정이 CONFINEMENT와 TRAP의 두 단계로 일어남을 알았다. 이 두 단계 전이 메카니즘은 이중전이를 잘 설명할 뿐만 아니라, 여러 형태의 초전도에서 보이는 자기적 성질, 특히 다양한 vortex structure를 보여주는 magnetic phase transition을 잘 설명할 수 있었다. 여러 종류의 초전도체들에서 공통적으로 발견되는 double transition과 다양한 magnetic phase transition을 잘 설명할 수 있는지 여부가 초전도 현상 설명의 일반이론으로 적합한지를 결정할 것이다. Since the discovery of ceramic superconductor the various theoretical developments has progressed but there are no definitive description about the superconducting transition mechanism. In special, both the double transition and the various magnetic phase transition add to the complication of the understanding of HTSC. In this paper, we presented the idea of the two-step mechanism for the superconducting transition in view of the condensation model of electron fluid for superconductivity. And these concepts are successfully applied to the double transition and the magnetic phase diagram of various types of superconductivity. Therefore, both the double transition and magnetic phase transition should be the touchstone of general theory for superconductivity.

전자유체의 차원에 따른 임계온도의 변화

박성훈,김미연,최동식,김원수,Park, Seong-Hun,Kim, Mi-Yeon,Chair, Tong-Seek,Kim, Won-Soo 대한화학회 1996 대한화학회지 Vol.40 No.6

In general, the high temperature superconductors have two-dimensional anisotropic structures. It is important to investigate the dependence of the critical temperature on the dimensions of the electron's motion. The equation of state for electron gas is deduced which describes the electron's motion in superconductors using the kinetic theory of gas. And the critical temperatures of three, two, and one dimensional gases were calculated. According to these equations, restricting the dimension of the electron's motion induces the increase of the critical temperatures. This implies the possibility that the multi-critical temperature of some superconductors is caused by the change of the dimension related to the pathways of the electron. 일반적으로 고온 초전도체들은 2차원적인 구조를 가지고 있으며, 2차원적인 구조가 초전도 물성과 어떠한 관계를 갖는가를 이해하는 것은 매우 중요하다. 본 논문에서는 초전도체 속의 전자기체를 기체분자운동론을 사용하여 각 차원에서의 상태 방정식을 유도하였으며, 그 기체가 액화될 때의 온도, 임계온도를 구하였다. 그 결과 전자의 자유도를 제한시킴에 따라 임계온도가 상승함을 알 수 있었다. 이것은 2차원적인 구조물질에 1차원적인 전자유통 경로가 있을 경우 여러가지의 임계온도를 가질 수 있음을 의미한다.

건설현장배치 수준의 정량적 평가: 사용성평가 방법을 활용하여

박성훈,김태완,손보식,Park, Seonghun,Kim, Tae Wan,Son, Bosik 한국건설관리학회 2022 건설관리 : 한국건설관리학회 학회지 Vol.23 No.5

Construction site layout is attracting attention as efficient use of construction site space greatly affects the duration and cost of the overall construction. Therefore, there are many studies that automate and optimize construction site layout planning. However, the usability of construction site, which consists of goal variables of the studies, has still been unknown. Therefore, the authors present the evaluation criteria for usability of construction site layout and evaluate the usability of domestic construction sites through user survey. Furthermore, the difference in usability between construction site managers and construction site workers was confirmed. As a result of the survey, domestic construction site layout had a low effectiveness and had the lowest score in the environment category. In addition, construction site workers scored lower overall than construction site managers. Through such usability evaluation results, it contributed to the construction site layout theory by assessing current construction site layout practice and suggesting an improvement direction for automating site layout planning.

Biohydrogen Production from Carbon Monoxide and Water by Rhodopseudomonas palustris P4

박성훈,오유관,Yu-Jin Kim,Ji-Young Park,Tae Ho Lee,김미선 한국생물공학회 2005 Biotechnology and Bioprocess Engineering Vol.10 No.3

A reactor-scale hydrogen (H2) production via the water-gas shift reaction of carbon monoxide (CO) and water was studied using the purple nonsulfur bacterium, Rhodopseudomonas palustris P4. The experiment was conducted in a two-step process: an aerobic/chemoheterotro-phic cell growth step and a subsequent anaerobic H2 production step. Important parameters investigated included the agitation speed, inlet CO concentration and gas retention time. P4 showed a stable H2 production capability with a maximum activity of 41 mmol H2 g cell-1h-1 during the continuous reactor operation of 400 h. The maximal volumetric H2 production rate was estimated to be 41 mmol H2 L-1h-1, which was about nine-fold and fifteen-fold higher than the rates reported for the photosynthetic bacteria Rhodospirillum rubrum and Rubrivivax gelatinosus, respectively. This is mainly attributed to the ability of P4 to grow to a high cell density with a high specific H2 production activity. This study indicates that P4 has an outstanding potential for a continuous H2 production via the water-gas shift reaction once a proper bioreactor system that provides a high rate of gas-liquid mass transfer is developed.

정책.제도 - '로하스식품' 이란무엇인가

박성훈,Park, Seong-Hun 한국식품연구원 2008 한맛한얼 Vol.1 No.1

유기식품 인증시스템 구축을 위한 조사연구 (2)

박성훈,Park, Seong-Hun 한국식품연구원 2006 食品技術 Vol.19 No.2

RBL 2H3 비만세포에서 히스타민 유리와 칼슘과의 관계

박성훈,김수정,김정민,박주현,최방실,이지윤,최미영,심상수,Park, Sung-Hun,Kim, Soo-Jeong,Kim, Jung-Min,Park, Ju-Hyun,Choi, Bang-Shil,Lee, Ji-Yun,Choi, Mi-Yeong,Sim, Sang-Soo 대한약학회 2007 약학회지 Vol.51 No.1

To investigate the relation between extracellular Ca$^{2+}$ and histamine release, we observed agonist-induced histamine release from RBL 2H3 mast cells in the presence or absence of extracellular Ca$^{2+}$ concentration. Histamine release induced by melittin and thapsigargin were greater in the presence of extracellular Ca$^{2+}$ than in the absence of extracellular Ca$^{2+}$. Econazole-induced histamine release had nothing to do with extracellular Ca$^{2+}$, whereas arachidonic acid-induced histamine release increased in the absence of extracellular Ca$^{2+}$. Calmodulin antagonists did not affect melittin-induced histamine release but they may potentiate arachidonic acid-induced histamine release. These data suggest that arachidonic acid-induced histamine release may be mediated via Ca$^{2+}$-independent pathway and may be potentiated by the block of Ca$^{2+}$-dependent pathway.

총설: 액체 중에서 상승하는 기포의 크기, 형상 및 속도

박성훈,Park, Sung Hoon 한국입자에어로졸학회 2017 Particle and Aerosol Research Vol.13 No.1

본 총설에서는 액체층을 통과하는 기포의 크기, 형상, 상승속도를 결정하기 위한 이론들을 살펴보았다. 액체의 물리적 특성과 기포의 유량으로부터 기포의 크기, 형상, 상승속도를 체계적으로 계산하는 여러 가지 이론식 및 모수식들을 살펴보고, 각각의 장단점을 정리하였다. 이 분야에서 발표된 초기 저작들에서는 주로 반복계산을 통해 기포의 형상과 상승속도를 결정하는 기법들이 사용되었으나, 최근에 발표된 논문들에서는 간단한 모수식을 통해 기포의 형상과 상승속도를 반복계산 없이 쉽게 구하는 기법들이 제시되고 있다. 이러한 기법들은 매우 다양한 물리적 특성을 가지는 실험결과들과의 비교에서도 우수성을 보여주고 있어, 관련 분야의 연구에 매우 유용한 도구로 사용할 수 있을 것으로 보인다. Accurate prediction of size, shape and velocity of a bubble rising through a liquid pool is very important for predicting the particulate removal efficiency in pool scrubbing, for designing engineering safety features to prepare for severe accidents in nuclear power plants, and for predicting the emission of fission products from MCCI (molten core-concrete interaction) process during severe accidents. In this review article, previous studies on the determination of the size, shape and rising velocity of a bubble in liquid are reviewed. Various theoretical and parameterization formulas calculating the bubble size, shape and velocity from physical properties of liquid and gas flowrate are compared. Recent studies tend to suggest simple parameterizations that can easily determine the bubble shape and rising velocity without iteration, whereas iteration has to be performed to determine the bubble shape and velocity in old theories. The recent parameterizations show good agreement with measured data obtained from experiments conducted using different liquid materials with very diverse physical properties, proving themselves to be very useful tools for researchers in related fields.