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- 저자 : 김정주(Kim, Jung-Ju) (검색결과 619 건)
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Preceramic Polymer를 이용한 저유전박막 제조 및 특성 분석
김정주,이정현,이윤주,권우택,김수룡,최두진,김형순,김영희,Kim, Jung-Ju,Lee, Jung-Hyun,Lee, Yoon-Joo,Kwon, Woo-Teck,Kim, Soo-Ryong,Choi, Doo-Jin,Kim, Hyung-Sun,Kim, Young-Hee 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6
Recently, variety of organic and inorganic hybrid materials have recently investigated as alternative routes to SiOC, $SiO_2$ thin film formation at low temperatures for applications in electronic ceramics. Specially, silicon based polymers, such as polycarbosilane, polysilane and polysilazane derivatives have been studied for use in electronic ceramics and have been applied as dielectric or insulating materials. In this study, Polycarbosilane(PCS), which Si-$CH_2$-Si bonds build up the backbone of the polymer, has been investigated as low-k materials using a solution process. After heat treatment at 350$^{\circ}C$ under $N_2$ atmosphere, chemical composition and dielectric constant of the thin film were $SiO_{0.27}C_{1.94}$ and 1.2, respectively. Mechanical property measured using nanoindentor shows 1.37 GPa.
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문항반응이론을 이용한 원격교육환경에서 사회적 실재감 측정도구의 타당도 검증
김정주 ( Jung Joo Kim ) 한국교육정보미디어학회(구 한국교육정보방송학회) 2011 교육정보미디어연구 Vol.17 No.1
본 연구는 원격교육에서 사회적 실재감 측정도구의 타당도를 검증하고 활용방안을 제시하는 것을 목적으로 한다. 이를 위해 Kim(2010)의 측정도구를 가지고 문항반응이론의 Rasch 모형분석을 실시하였다. 도구는 상호지원 및 집중, 정서적 유대감, 공동체감 및 개방적 커뮤니케이션의 4개 하위영역의 총 19개 문항으로 이루어졌다. 분석 자료는 기존의 국내 5개 사이버대학의 재학생들의 설문을 통해 수거된 유효응답자 492개의 표본을 사용하였다. 분석 결과는 다음과 같다. 우선, 문항의 적합도 분석 결과 외적합도수가 기준치인 1.50 이상으로 나온 1개 문항을 제거하는 것이 적절한 것으로 판단되었다. 둘째, 기존 도구에서 구인을 측정하는 데 사용된 5점 척도의 유용함을 분석한 결과 각 응답범주가 명확하고 유용하여 5점 척도의 사용이 타당함을 검증할 수 있었다. 셋째, 문항난이도 분석을 통해 개인들의 속성을 모두 측정할 수 있도록 비교적 난이도가 골고루 분포되어 있음을 확인하였다. 다만 개인의 속성 점수가 매우 높거나 매우 낮은 부분을 측정하는 문항들이 중간부분에 비해 상대적으로 적게 분포되어 있었다. 본 연구의 결과를 바탕으로 사회적 실재감의 영역별 속성, 변화 양태에 따른 연구와 구체적이고 실천적인 교수법을 제안하는 연구 등 많은 영역과 주제에 본 도구를 활용할 수 있음을 제시하였다. This study is purported to verify the validation of social presence scale and represent its application in distance education. To meet its purpose, this study applied Rasch model based on item response theory to analyze Kim`s social presence scale (2010) among others. This scale was composed of 19 items from 4 domains such as mutual attention and support, affective connectedness, sense of community and open communication. The data used in this study was 492 samples valid for analysis that was collected from the students surveyed from 5 cyber universities in Korea. The result of analysis is as following. First, the appropriateness of overall items would be better adjusted with deletion of 1 item. Second, 5 response categories used in the instrument are confirmed to be appropriate to measure individuals` responses. Third, item difficulty analysis showed that items are well distributed to measure overall individuals` attributes but not the ones with very high or low social presence. Based on this result, this study suggested the application of the scale in such a way that it can be used in many studies using 4 domains and developmental attributes of social presence resulted from this study and suggesting specific and practical instructional methods. It is expected that this scale can be elaborated and generated by being used in many forthcoming studies.
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구토(嘔吐)를 동반한 두위변화(頭位變化)에 따른 현훈증(眩暈症) 치험(治驗) 1예(例)
김정주,김명균,최정락,박성식,Kim, Jung-Ju,Kim, Myung-Gune,Choi, Jeong-Rak,Park, Seong-Sik 사상체질의학회 2004 사상체질의학회지 Vol.16 No.2
1. Objectives Benign Paroxysmal Positional Vertigo (BPPV) is thought to be due to debris which has collected within a part of the inner ear. It is best characterized by true vertigo and geotropic nystagmus that occur a few seconds after specific head movements. The symptoms of BPPV include dizziness or vertigo, lightheadedness, imbalance, and nausea. The vertigo usually lasts no more than a minute. This study is reported to evaluate the effect of Geopung-san(祛風散) to patient with vertigo. 2. Methods This patient was treated by Geopung-san(祛風散) and Acupuncture, who was diagnosed as Soeumin interior disease. We used Visual analogue scale(VAS) for the assessment of vertigo. 3. Results This patient's main symptom is vertigo according to head movement with nausea and vomiting. So she was treated by Geopung-san(祛風散) in "Dongyisasangsinpyun(東醫四象新編)" and showed a positive response about her problems. 4. Conclusions We suggest that Geopung-san(祛風散) is effected significantly to patient with vertigo, but then we consider that studies about the case like this are more needed.
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70 MPa급 인공암반 내 실대형 쉴드TBM 굴진실험을 통한 굴진율 모델 및 활용방안 제안
김정주,김경열,류희환,정주환,홍성연,조선아,배두산,Kim, Jungjoo,Kim, Kyoungyul,Ryu, Heehwan,Hwan, Jung Ju,Hong, Sungyun,Jo, Seonah,Bae, Dusan 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.3
전력송전을 위한 터널식 전력구는 점차 시공실적이 증가하고 있는 추세이며, 해저 및 대심도 등 시공환경이 어려운 구간의 건설도 증가하고 있다. 이에 소단면 쉴드TBM의 효율적 운영을 위해 굴진율 및 설계모델이 필요하다. 그러나, 제한된 지반조사 회수 및 굴착면 맵핑으로 인하여 암반특성과 굴진데이터를 정확히 매칭시켜 상호간 상관관계 및 굴진율 모델을 도출하는데 어려움이 있다. 이에 소단면 쉴드TBM에 적합한 굴진율 및 설계모델을 제시하기 위하여 커터헤드의 직경이 3.56 m인 실험용 EPB 쉴드TBM을 제작하고, 총 부피 87.5 ㎥인 인공암반 내에서 총 19번의 실대형 굴진실험을 수행하였다. 본 실험은 70MPa의 균질한 암반강도에서 수행되었기 때문에 운전변수인 추력과 커터헤드의 RPM에 따른 굴진율과 기계데이터간 상관관계를 효율적으로 분석할 수 있으며, 실제 굴착메커니즘과 동일하기 때문에 도출된 압입깊이와 토크값은 활용성이 높다. 본 연구를 통해 디스크커터 당 연직력과 압입깊이의 상관관계 및 연직력과 회전력의 상관관계를 도출하였다. 이러한 상관관계들을 이용하여 70 MPa급 암반에 대해 굴진율 예측과 TBM 설계가 가능할 것으로 판단한다. 또한, 인공암반의 RQD가 100%로 현장적용에 대한 한계점에 대해 FPI의 개념을 도입하여 굴진율 모델의 활용성을 증대시키고자 하였다. The use of cable tunnels for electric power transmission as well as their construction in difficult conditions such as in subsea terrains and large overburden areas has increased. So, in order to efficiently operate the small diameter shield TBM (Tunnel Boring Machine), the estimation of advance rate and development of a design model is necessary. However, due to limited scope of survey and face mapping, it is very difficult to match the rock mass characteristics and TBM operational data in order to achieve their mutual relationships and to develop an advance rate model. Also, the working mechanism of previously utilized linear cutting machine is slightly different than the real excavation mechanism owing to the penetration of a number of disc cutters taking place at the same time in the rock mass in conjunction with rotation of the cutterhead. So, in order to suggest the advance rate and machine design models for small diameter TBMs, an EPB (Earth Pressure Balance) shield TBM having 3.54 m diameter cutterhead was manufactured and 19 cases of full-scale tunneling tests were performed each in 87.5 ㎥ volume of artificial rock mass. The relationships between advance rate and machine data were effectively analyzed by performing the tests in homogeneous rock mass with 70 MPa uniaxial compressive strength according to the TBM operational parameters such as thrust force and RPM of cutterhead. The utilization of the recorded penetration depth and torque values in the development of models is more accurate and realistic since they were derived through real excavation mechanism. The relationships between normal force on single disc cutter and penetration depth as well as between normal force and rolling force were suggested in this study. The prediction of advance rate and design of TBM can be performed in rock mass having 70 MPa strength using these relationships. An effort was made to improve the application of the developed model by applying the FPI (Field Penetration Index) concept which can overcome the limitation of 100% RQD (Rock Quality Designation) in artificial rock mass.
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