인버터 열펌프 시스템의 실험적 모델링 및 제어 성능 시뮬레이션

윤성환(Seong-Hwan Yoon),장효환(Hyo-Whan Chang) 대한설비공학회 2001 대한설비공학회 학술발표대회논문집 Vol.2001 No.-

고구려 후기 ‘大人’의 실체와 大對盧

윤성환(Yoon, Sung-hwan) 국방부 군사편찬연구소 2015 군사 Vol.- No.95

As we have seen, the daedaero(大對盧) in late Goguryeo was the highest position of an official rank and government office. However, unlike the conventional understanding, the daedaero was multiple as official rank. It was told the daein(大人) or tojol(吐?) to distinguish with a government office daedaero in the middle of the 7th century. Also, numerous daein"s could take office in as government office daedaero. It was elected through the meeting of daein"s(大人會議). The meeting of daein"s was composed of the daein"s, discussed the election and re-election of a daedaero. This conference, which is run by council system of all members, certified the daedaero as representatives of daein society. This fact indicates that Yeon Taejo(淵太祚), the father of Yeon Kaesomoon(淵蓋蘇文), was served as official rank the daedaero(=daein, tojol) and as government office daedaero. Yeon Kaesomoon inherited the daein from his father. Nobilities" counsel system in late Goguryeo operated the meeting of daein"s and the council of five offices(五官會議) as conference system. The meeting of daein"s tuned political dynamics inter nobilities. While the council of five offices(五官會議) was to administrate state affairs. Dual operation of the conference system of nobilities was to prevent possibility that power struggle of nobilities spread over affairs of state. Also, king could not intervene the meeting of daein"s. king do not carry out as higher power in that case. And the existence of the meeting of daein"s make some nobilities monopolizing the positions as government office daedaero. Therefore, the meeting of daein"s was also in a sense privileged authority.

질소 희석된 프로판 자유제트 층류부상화염에 있어서 화염 자기진동 특성에 관한 연구

윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),배대석(Dae Seok Bae) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.4

질소 희석된 프로판 층류 부상 화염에서 화염진동 불안정성과 화염 곡률 효과를 살펴보기 위하여 실험적 연구를 수행하였다. 화염 진동은 총 3가지 영역으로 열손실에 의한 진동, 열손실 및 부력이 혼재된 진동, 그리고 열손실 및 루이스 수에 의한 영향이 혼재된 진동으로 구분되었다. 순수 열손실에 의한 진동은 루이스 수에 의한 진동과 부력에 의한 수력학적 불안정성과 관련이 없으며 연료 루이스 수에 관계없이 모든 부상화염 조건에서 관찰되었다. 화염의 시간에 따른 부상높이 변화에 대한 FFT분석을 통해 화염진동 불안정성의 실험적 증거와 특성을 명확히 제시하였고, 부상 화염의 열손실에 의한 자기진동의 메커니즘에 대한 시나리오를 논의한다. The characteristics of lifted laminar propane flames diluted with nitrogen have been investigated experimentally to elucidate self-excitation and the effects of flame curvature. Flame oscillation modes are classified as follows: oscillation induced by heat loss, a combination of oscillations induced by heat loss and buoyancy, and a combination of the oscillations induced by heat loss and diffusive thermal instability. It is shown that the oscillation induced only by heat loss is not relevant to the diffusive thermal instability and hydrodynamic instability caused by buoyancy; this oscillation is observed under all lift-off flame conditions irrespective of the fuel Lewis number. These experimental evidences are displayed through the analysis of the power spectrum for the temporal variation of lift-off height. The possible mechanism of the oscillation induced by heat loss is also discussed.

진동하는 층류부상화염에서 화염곡률 효과에 관한 연구

윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),윤진한(Jin Han Yun),길상인(Sang In Keel) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-

Experimental study is conducted to grasp effects of flame curvature on flame behavior in laminar lifted-jet flames. Nozzle diameters of 0.1 and 1.0㎜ are used to vary flame curvature of edge flame. Particularly lifted-flame height with the burner diameter of 1.0㎜ is quite different from that with jet similarity solution considering virtual origin. As a result the importance of curvature effects are recognized that there exist three types of edge flame oscillation. These edge flame oscillations are caused by radial conduction heat loss even at fuel Lewis numbers less than unity, by fuel Lewis numbers near or larger than unity with the help of appreciable radial conduction heat loss, and by buoyancy effects. These are confirmed by the analysis of oscillating frequencies.

기업이미지와 브랜드개성이 중국소비자들의 한국제품 선택에 미치는 영향

윤성환(Yoon, Seong-Hwan) 계명대학교 국제학연구소 2010 국제학논총 Vol.14 No.-

This thesis researches directly and indirectly how corporate image and brand personality, influence the Beijing consumer’s Korean Products selection. The analysis resulted in telling that the corporate image worked better than the brand personality in influencing Beijing consumer’s judgment although each image has its own influence. This may provide some strategic suggestions with regards to reconsidering Korean corporate image and brand personality for Chinese local business in China to be successful.

다차원 압축성 유동 해석을 위한 MLP 기법의 개발

윤성환(Sung-Hwan Yoon),김종암(Chongam Kim),김규홍(Kyu Hong Kim) 한국항공우주학회 2006 韓國航空宇宙學會誌 Vol.34 No.7

본 논문에서는 불연속면이 포함된 다차원 유통에서 흔히 발생하는 수치적 진동현상을 막기 위해 기존의 TVD 제한자를 분석함으로써 새로운 형태의 다차원 제한 함수를 유도하였다. MLP 기법은 유도된 다차원 제한 함수를 기반으로 하며, 다차원 불연속면에서의 수치 진동을 효과적으로 제거하고 동시에 3차 이상의 공간 정확도 내삽기법과 함께 사용할 수 있다는 장점을 갖는다. 또한, 정상 유동의 경우 수치 진동이 제거됨으로써 수렴성이 향상됨을 확인할 수 있었고, 실제 코드에 적용하는 방법도 간단하다. MLP 기법을 적용함으로써 불연속 유동 뿐 만 아니라 연속 유동에서도 정확성, 효율성, 강건성 면에서 향상된 결과를 얻을 수 있음을 여러 가지 수치 실험을 통하여 확인하였다. Through the analysis of conventional TVD limiters, a new multi-dimensional limiting function is derived for an oscillation control in multi-dimensional flows. Then, Multi-dimensional Limiting Process (MLP) is developed with the multi-dimensional limiting function. The major advantage of MLP is to prevent oscillations across a multi-dimensional discontinuity, and it is readily compatible with more than 3<SUP>rd</SUP> order spatial interpolation. Moreover, MLP shows a good convergence characteristic in a steady problem and it is very simple to be implemented. Through numerical test cases, it is verified that MLP substantially improves accuracy, efficiency and robustness both in continuous and discontinuous flows.

저공해 버너에서의 운전조건에 따른 미분탄 분배특성에 관한 수치해석 연구

윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),박호영(Ho Young Park),서상일(Sang Il Seo) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.5

국내에서 널리 사용되는 500 MW급 미분탄 화력발전에서 2개의 PM (pollution minimum) 버너의 최적 운전 범위를 확인하기 위하여 DPM (discrete phase model)을 활용하여 수치계산을 수행하였다. 본 연구는 저가의 아역청탄의 활용 증진을 위하여 다양한 조건에서 탄 종별로 연구를 수행하는데 그 목적이 있다. 탄 종별로 미분탄의 질량 유량, 1차 공기의 질량 유량, 그리고 미분탄의 입자 크기 분포를 달리하여 공기/석탄의 분배비의 영향을 조사하였다. 이러한 매개변수에 관하여 PM 버너에서의 공기/석탄의 분배비의 최적운전조건을 도출하고 이에 대해 논의하고자 한다. We performed numerical simulation using a DPM (discrete phase model) to identify the optimal operation ranges in two representative PM burners widely used in domestic 500-MW pulverized coal-fired power plants. Recently there has been an increased utilization of low-cost coals such as sub-bituminous coal. We investigate the effects of coal blends on the distribution ratio of coal to air by varying the mass flow rates of pulverized coal and primary air and the particle size. We present and discuss optimal conditions for the distribution ratio of coal to air in PM burners.

패시브환기외피의 통기 및 열성능에 관한 실험적 연구

윤성환(Seong-Hwan Yoon),이태철(Tae-Cheol Lee),강정식(Jung-Sik Kang) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.11

In this study, 5 types of PVS(Passive ventilation system) units are made and experimented its ventilation performance, thermal performance according to open rate and hole diameter of perforated aluminum plane. Results are as follows. 1) The ventilation performance increases approximately 50~70% according by the open rate of PVS increasing. Also, the ventilation performance increases about 2%~12% according by the hole diameter of PVS increasing. 2) In winter temperature/pressure condition(in:20℃, out:-2℃/△P:0.2~5.0Pa) the temperature of inflow air decreases according by the open rate of PVS increasing. Heat gain performance decreases 10.1%, 25.6% when open rate increases 3) In the same condition, Heat gain performance decreases 18.3%, 18.8% according by the hole diameter of PVS increasing.

수밀화 콘크리트 분말형 혼화재의 첨가율에 따른 콘트리트 압축강도에 관한 연구

윤성환(Yoon, Sung Hwan),서현재(Seo, Hyun Jae),박진상(Park, Jin Sang),오상근(Oh, Sang Keun) 한국콘크리트학회 2011 한국콘크리트학회 학술대회 논문집 Vol.2011 No.5

구문다의성 및 구문확장에 관한 소고

남양우 ( Nam Ryangwoo ) 한국중국언어학회 2020 중국언어연구 Vol.0 No.89

This paper discussed the construction polysemy and the construction expansion based on previous study about individual constructions. The construction has its construction meaning, which can be extended from central sense to expanded sense. We can explain polysemy of the construction through core meaning and meaning chains, like vocabularies. The construction can also be expanded under the influence of other constructions. The construction expansion can be divided into four types. First type is that two constructions have same form but their arguments are different. Second type is that two constructions have different form but their arguments are same. Third type is that two constructions have different argument but one construction is subpart of the other construction. Forth type is that two constructions have different form and argument, but they are metaphorically involved. Polysemy of some constructions can not be explained by core meaning and meaning chains, these constructions are influenced by expansion of the construction itself and external forces. The construction may be expanded with a complex influence from multiple constructions in the process of expansion. And some constructions have polysemy and construction expansion together. In conclusion, the construction polysemy and the construction expansion show complex aspects in which the constructions continue to develop as they interact with each other.