• 한국가스학회지
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• 제26권6호
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• pp.37-44
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• 2022

본 연구에서는 SN(Swirl Number)는 같지만 코어부와 스월러부의 질량유량비(m)가 다른 저선회 노즐 2종을 설계하여 상압 연소성능 시험을 수행하였다. 각 노즐에 대해 단열화염온도에 따른 연소성능 실험을 수행하였고 화염구조 특성, NOx 배출 특성, 연소진동 모드를 파악하였다. 화염구조가 크게 차이가 있었지만 CO 배츨 특성은 유사하였고 NOx 배출 특성도 화염구조보다는 연소진동과 더 큰 관련성이 있음을 보였다. 연료노즐의 위치를 변경하여 대류지연시간을 조절하면서 연소진동 및 NOx 배출 특성을 파악하였는데 대류지연시간이 연소진동 주기의 (3+4n)/4±1/4 (n=0,1,2,...) 영역에 들어올 때 진소진동이 강하게 나타나고 반대의 경우는 연소진동이 아주 약하게 발생함을 확인하였다.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2004년도 춘계 학술발표대회 논문집
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• pp.14-15
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• 2004

• 대한예방의학회:학술대회논문집
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• 대한예방의학회 1998년도 제50차 추계 학술대회 연제집
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• pp.262-263
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• 1998

• 한국항행학회논문지
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• 제11권3호
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• pp.313-318
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• 2007

본 논문은 FDA(Fault Detection Agent)의 설계와 구축을 설명한다. FDA는 홈 네트워크 환경에서 멀티미디어 원격 교육을 위한 소프트웨어 오류를 감지하기에 적합한 에이전트이다. 이 시스템은 ED, ES로 구성되어 있다. ED는 홈 네트워크 환경에서 멀티미디어 원격 교육을 위하여 훅 킹 기법으로 오류를 감지하는 에이전트이다. ES는 홈 네트워크 환경에서 멀티미디어 원격 교육을 위하여 오류를 공유하는 에이전트이다. 멀티미디어 공동 작업 환경의 관점에서 오류 공유는 협동 작업에 참가하는 참가자에게 상호작용적으로 오류를 공유한다. 훅 킹 방법과 가로채기 방법과의 비교를 통하여 효율성 분석을 하였다.

• 설비공학논문집
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• 제27권4호
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• pp.195-200
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• 2015

The thermal performance in the channels with two-wall rectangular convergent/divergent cross-sectional areas along the axial distance was investigated experimentally. The ribbed rectangular convergent/divergent channels were manufactured with a fixed rib height (e) = 10 mm and the ratio of rib spacing (p) to height (e) = 10. Three different parallel angled ribs (a = $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$) were each placed on the channel's one sided wall only. The convergent channel of $D_{ho}/D_{hi}=0.67$ and the divergent channel of $D_{ho}/D_{hi}=1.49$ were considered. The ribbed divergent channel produced better thermal performance than the ribbed convergent channel in three different restrictions; identical flow rate, identical pumping power, and identical pressure loss.

• 한국결정성장학회지
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• 제8권3호
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• pp.396-400
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• 1998

KLN은 성장 결정 내의 $Nb_2O_5$함유량에 따라 물성이 크게 변화하므로 단결정의 조성제어가 매우 중요하다. 본 실험에서는 초기 KLN용액의 $Nb_2O_5$함량을 증가시켜 $Nb_2O_5$함유량이 높은 KLN단결정을 온도요동법과 TSSG법에 의해 성장시키고 성장된 KLN단결정인 $Nb_2O_5$증가량에 따른 격자결함의 유무를 관찰하고자 유전 및 광학 특성을 관찰하다. KLN 단결정 내에 격자결함의 증가에 의해 낮은 에너지로의 단락 frequency 이동과 DPT 특성을 보이는 넓은 Curie 범위가 관찰되었다.

• 한국의사학회지
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• 제23권1호
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• pp.105-113
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• 2010

Seungjeongwon Ilgi["承政院日記"], the Diaries of Royal Secretariat of the Joeson Dynasty is the most massive compilation of records in Korean history. Medical records in Seungjeongwon Ilgi have been studied but the procedures of clinical discussion[議藥] have not yet been studied. In this paper, main agents of clinical discussion, formation of participant doctor system, particularity of clinical discussion in Royal Court and problems derived from it will be discussed. Main agents of clinical discussion were court doctors[內醫], royal doctors[御醫] and participant doctors[議藥同參]. The king himself decided ultimately as a matter of form. Head of the Medical Dpt. of the Palace[藥房都提調] was in charge of attending to king, but head of the court doctor[首醫] led the actual discussion of deciding treatment. The Medical Dpt. of the Palace[內醫院] was divided into three sectors-court doctor division, acupuncture doctor division and participant doctor division. Palace doctors payed a great attention to avoid serious error. This tendency led them occasionally to passive management. Sometimes aggressive treatment is needed in the course of treating disease, but palace doctors tended to choose slow and gradual methods. It induced minor conflict between palace doctors and participant doctors from outside palace, because doctors from outside palace subordinated effectiveness. Their opinion had not been always recognized by court doctors. However, their role was meaningful because they provided flexibility to the rigidity of clinical discussion in the palace. It is important to evaluate clinical records in Seungjeongwon Ilgi["承政院日記"]. If we have broader eye on the clinical procedure in the palace, we can estimate the value of the contents more objectively and accurately.

• 동력기계공학회지
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• 제20권1호
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• pp.69-74
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• 2016

The local heat transfer and pressure drops of developed turbulent flows in the convergent channels with square cross-sectional areas along the streamwise distance have been investigated experimentally. Four different parallel angled ribs (a = $30^{\circ}$, $45^{\circ}$, $60^{\circ}$, and $90^{\circ}$) are placed to the one sided wall only, respectively. The ribbed walls are manufactured with a fixed rib height (e)=10 mm and the ratio of rib spacing (p) to height (e) = 10. The measurement was run within the range of Reynolds numbers from 22,000 to 79,000. The result shows that the increases in the Nusselt numbers for the flow attack angles can be seen in the order of $30^{\circ}$, $45^{\circ}$, $60^{\circ}$ and $90^{\circ}$.

• 동력기계공학회지
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• 제19권5호
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• pp.32-37
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• 2015

The present study is to investigates the convective heat transfer characteristics and pressure drop inside the rib-roughened cooling passage of gas turbine blades. The divergent rectangular channel is fabricated with V-shaped ribs on one wall only and the inlet hydraulic diameter to outlet hydraulic diameter ratio($D_{ho}/D_{hi}$) of 1.49 is used. The current investigation has covered a Reynolds number (Re) range of 22,000~75,000, relative roughness height ($e/D_h$) of 0.1~0.2, and rib angle of attack (a) of $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$ for a fixed relative pitch of 10. Results show that the Nusselt numbers are the greatest in the $60^{\circ}$-angled ribs; however, the total friction factors are the highest in the $30^{\circ}$-angled ribs.

• 한국의류학회지
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• 제30권11호
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• pp.1550-1559
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• 2006

The purpose of this study is to measure middle aged men's bodies around the ages of thirty-five through filly-five, whose age-group undergoes drastic changes on their body shapes. Further, body shapes are grouped based on the measurements, and pattern making methods are presented in order to effectively make up for the undesirable body features of middle-aged men. In order to develop patterns fit for middle aged men's body shapes, the regression which reflects physical characteristics was applied for the experimental shirts pattern, instead of comparative patterns which applies the same equation. For the two body types classified above(Bend-forward Type and Lean-back Type), correlation among the factors necessary for pattern design was considered and the regression was formularized accordingly. To validate the regression, the same amount of ease as in the comparative patterns was applied to the chest girth, and reasonable ease to the armhole depth and neck girth. In this way, experimental shirts patterns fit for the body types were developed. After the modification through the wearing test, the experimental shirts pattern was completed as herein.