http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전력설비 자산관리를 위한 경제적 교체수명 평가 방법론에 관한 연구
박기훈,김용현,박병석,김동섭 대한전기학회 2024 전기학회논문지 Vol.73 No.1
Power companies worldwide have been installing and expanding numerous power facilities to meet the energy demand driven by economic growth. These facilities need to be replaced sequentially to reduce the risk of failures. However, it is practically difficult to uniformly replace a large number of facilities each year due to constraints such as budget limitations, adjustments to outage planning, and construction capacity. As a result, there is a need for an efficient long-term equipment investment plan and a strategic equipment investment plan through asset management. Therefore, this paper analyzes the methodology for economic life evaluation to develop medium to long-term investment strategies for power facilities. It examines the changes in the economic replacement life of the equipment based on the impact of failures and variations in the discount rate from an economic perspective. The goal is to establish a foundation for medium to long-term equipment replacement strategies.
수세법과 pH 조절법에 의한 닭가슴살 surimi의 품질 특성
박기훈,김인진,하지희,강석모,김일석,진상근 한국축산식품학회 2005 심포지움 및 학술발표회 Vol.- No.35
닭가슴살을 이용해서 수리미 제조 시 4회 수세한 대조구, pH 3.0으로 산 처리한 T1, pH 11.0으로 알카리 처리한 T2로 하여 그 품질 특성을 비교한 결과 일반성분에서 수분, 조단백질과 염용성단백질 및 수율은 대조구에 비하여 pH 조절법으로 한 두 구가 높았으며, 조지방은 T2가 다른 두 구에 비하여 높았다. pH, 보수력, 파괴강도, 변형값은 처리 간에 유의적인 차이를 보이지 않았다. 전단가는 T2가 가장 높고, T1, 대조구 순이었다. L* 값은 T2가 다른 두 구보다 낮았으며, a* 값은 T1이 다른 두 구에 비하여 낮았다. b* 값은 대조구가 가장 높고, T2가 가장 낮았다. 조직감에서 파쇄성 및 경도는 처리 간에 유의적인 차이를 보이지 않았으며, 응집성은 T1이 다른 두 구보다 낮았으며, 탄력성과 부착성은 대조구에 비하여 T1과 T2가 높았다. 검성은 대조구와 T1에 비하여 T2가 높았다. 조직감의 전 항목에서 T2 가 가장 높았다. 관능검사 결과 외관과 맛은 T1이 가장 높고, 대조구가 가장 낮았다. 색, 향, 다즙성, 연도 및 전체적인 기호도는 처리 간에 유의적인 차이가 없었다
박기훈,김용현,권순석 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.-
Pulmonary epithelioid hemangioendothelioma (PEH), previously known as "intravascular bronchoalveolar tumor," is a rare vascular tumor of the lung. PEH can be primary in the lung and pleura, or it may arise in the liver, soft tissue or bone. PEH typically occurs as bilateral multiple nodules among young women. But some cases also develop as a solitary lung nodule or a single cavitary nodule, usually without calcification. We describe here an unusual case of PEH in a 74-year-old female with a 3.0 cm dominant mass along with bilateral multiple calcified small nodules. Overall histologic findings of the solitary tumor accorded with conventional PEH. After comprehensive analysis of morphology, radiography, histochemistry, im-munohistochemistry and differential diagnoses, PEH presenting multiple calcified small nodules was confirmed. The patient was treated with analgesics and the chest pain gradually subsided. Six months after the diagnosis, the radiological and clinical status of the patient remained unchanged. The patient continues medical follow-up but without specific treatment.
불화 암모늄이 포함된 크러스레이트 하이드레이트의 열팽창 거동 연구
박기훈,차민준 한국자원공학회 2019 한국자원공학회지 Vol.56 No.6
Herein, the thermal expansion behavior of clathrate hydrates with ammonium fluoride (NH4F) was investigated. Water and NH4F comprise a ‘host’ hydrate structure, where ‘guest’ molecules, including propylene oxide, 2-methyl-2-propen-1-ol, and methanol, are captured in hydrate cages. The X-ray diffraction patterns of the hydrate samples were examined, confirming the formation of a cubic Fd3m hydrate. Notably, methanol can be captured in the hydrate cages with NH4F. The lattice parameters of the clathrate hydrates with NH4F were found to be smaller than those of the clathrate hydrates with pure water. In addition, the lattice parameters of clathrate hydrates encapsulating 2-methyl-2-propen-1-ol and methanol were larger than those with propylene oxide and methane due to the effects of molecular size and shape. Finally, the effects of molecular size and shape on the thermal expansivity of clathrate hydrates with NH4F were confirmed. 이 연구에서는 불화 암모늄(NH4F)이 포함된 크러스레이트 하이드레이트의 열팽창 거동에 관한 연구를 수행하였다. 불화 암모늄과 물로 구성된 구조 안에 포집된 객체 분자는 프로필렌 옥사이드(Propylene oxide), 2-메틸-2-프로펜-1-올(2-Methyl-2-propen-1-ol), 메탄올(Methanol)로, X선 회절분석을 통해 얻은 하이드레이트의 패턴 분석을 통하여 입방정계 Fd3m 하이드레이트의 형성을 확인하였다. 불화 암모늄이 포함된 하이드레이트 구조는 기존의 순수물로 구성된 하이드레이트의 격자상수에 비하여 더 작은 값을 가지는 것으로 나타났다. 객체 분자의 크기, 형태의 영향으로 2-메틸-2-프로펜-1-올과 메탄올이 포집된 하이드레이트의 격자상수는 프로필렌 옥사이드와 메탄올이 포집된 하이드레이트의 값보다 큰 것으로 확인되었으며, 열팽창률 또한 큰 것으로 확인되었다.
펄스 반복률에 의한 반도체 소자의 오동작 모드와 고장률에 관한 연구
박기훈,방정주,김륙완,허창수,Park, Ki-Hoon,Bang, Jeong-Ju,Kim, Ruck-Woan,Huh, Chang-Su 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.6
Electronic systems based on solid state devices have changed to be more complicated and miniaturized as the electronic systems developed. If the electronic systems are exposed to HPEM (high power electromagnetics), the systems will be destroyed by the coupling effects of electromagnetic waves. Because the HPEM has fast rise time and high voltage of the pulse, the semiconductors are vulnerable to external stress factor such as the coupled electromagnetic pulse. Therefore, we will discuss about malfunction behavior and DFR (destruction failure rate) of the semiconductor caused by amplitude and repetition rate of the pulse. For this experiment, the pulses were injected into the pins of general purpose IC due to the fact that pulse injection test enables the phenomenon after the HPEM is coupled to power cables. These pulses were produced by pulse generator and their characteristics are 2.1 [ns] of pulse width, 1.1 [ns] of pulse rise time and 30, 60, 120 [Hz] of pulse repetition rate. The injected pulses have changed frequency, period and duty ratio of output generated by Timer IC. Also, as the pulse repetition rate increases the breakdown threshold point of the timer IC was reduced.
Lignans from the Flower Buds of Magnolia fargesii
박기훈,Min Suk Yang,Sang Hae Nam,Mi Yae Shon,Seon Woo Hwang,Jun Lee 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.6
The three new lignans 1-3 were isolated from the methanol extracts of the flower buds of Magnolia fargesii. They were elucidated as (7S,8R)-1-(3,4-dimethoxyphenyl)-2-O-(2-methoxy-4-omegahydroxypropylphenyl) propane-1,3-diol, (7S,8S)-1-(4-hydroxy-3-methoxyphenyl)-2-O-(6-hydroxy-2-methoxy-4-omegahydroxy- propylphenyl) propane-1,3-diol, and [tetrahydro-4-hydroxy-2-(3,4,5-trimethoxyphenyl)furan-3-yl]methyl 3,4-dimethoxy benzoate by spectral analysis.