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적응적 방향성 보간을 이용한 효율적인 공간적 에러 은닉 기법
박선규,김원기,정제창,Park, Sun-Kyu,Kim, Won-Ki,Jeong, Je-Chang 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.5c
에러가 존재하는 전송 환경에서 압축된 영상을 전송하는 경우, 일정한 화질을 유지하기 위해서는 에러 은닉 기법이 필요하다. 본 논문에서는 블록 기반의 영상 압축에 있어서 공간적 에러 은닉 기법을 제안한다. 제안된 기법은 공간 영역에서 슬라이스 단위의 에러가 발생했을 경우, 에러가 발생한 블록에 이웃하는 상 하 블록의 경계 화소를 이용하여 손상된 블록의 상 하 외곽 영역의 세밀한 에지 방향성을 찾아 각각 부분 복원을 한다. 그리고 복원되지 않은 내부 영역은 이웃한 경계 화소를 이용하여 블록 내의 전체적인 에지 방향성을 찾아 적응적으로 최종 복원 영상을 만들어 내는 2단계의 경계 정합 기법이다. 이 기법은 기존의 에러 은닉 방식보다 복잡도가 낮을 뿐만 아니라 에지를 흐름을 잘 복원하여 객관적 주관적으로 우수한 복원 영상을 얻게 해준다. When error occurs during the network transmission of the image, the quality of the restored image is very serious. Therefore to maintain the received image quality, the error concealment technique is necessary. This paper presents an efficient spatial error concealment method using adaptive edge-oriented interpolation. It deals with errors on slice level. The proposed method uses boundary matching method having 2-step processes. We divide error block into external and internal region, adaptively restore each region. Because this method use overall as well as local edge characteristics, it preserves edge continuity and texture feature. The proposed technique reduces the complexity and provide better reconstruction quality for damaged images than the previous methods.
플라이애시 및 폴리실리콘 슬러지 혼입율에 따른 제지애시 경화체의 경량 특성
박선규,김윤미,이상수,Park, Sun-Gyu,Kim, Yun-Mi,Lee, Sang-Soo 한국건설순환자원학회 2014 한국건설순환자원학회 논문집 Vol.2 No.2
기포콘크리트의 재료 중 시멘트는 제조과정 중에 $CO_2$를 다량 발생시키기 때문에 지구 환경적인 측면에서 커다란 문제가 되고 있지만, 아직까지 시멘트를 대체할 수 있는 대체재에 대한 연구 개발이 미흡한 실정이다. 또한, 발포제는 압축강도가 낮고 고가인 단점이 있다. 이 때문에 강도와 경량 등의 성능 개선과 친환경적인 재료의 사용이 필요한 실정이다. 이에 본 연구에서는 시멘트와 발포제를 대체하기 위해 고로슬래그와 제지애시를 사용하여 경량 경화체를 제조하고자 하였으며, 강도 및 경량성을 보완하기 위해 플라이애시와 폴리실리콘 슬러지를 사용하여 실험을 실시하였다. 그 결과, 플라이애시를 사용한 경화체는 Plain 보다 낮은 밀도를 나타내었으나 강도보완에는 취약하였으며, 폴리실리콘 슬러지를 사용한 경우는 3%치환한 경화체가 압축강도는 Plain보다 다소 낮지만 겉보기 밀도의 감소가 큰 것으로 나타났다. This experimental study considers manufacturing method of the non-portland cement matrix for the light-weight building materials using blast furnace slag, paper ash, fly ash and polysilicon sludge the industrial by-product. For the experiment, we used paper ash by means of the foaming agent and alkali activator to make non-portland cement light-weight matrix. Various specimens were prepared with different types and addition ratios of the alkali activator. Then, the properties of these specimens were investigated by compressive strength test, bulk specific gravity. As a results, it was judged that experiment results of non-portland cement matrix with specific waste resources and alkali activators were useful as basic data for mixtures design and evaluation properties of lightweight non-portland cement building material.
개질전로슬래그를 활용한 슬래그 시멘트 클링커 소성에 관한 연구
박선규,김영환,고인용,Park Sun-Ku,Kim Young-Whan,Ko In-Yong 한국자원리싸이클링학회 2002 資源 리싸이클링 Vol.11 No.6
전로슬래그를 환원개질한 후 -200/+325 mesh 입도로 분쇄하고, 시약급 CaO, $SiO_2$, $Fe_2$$O_3$등을 첨가하여 보통 포틀란트 시멘트를 형성할 수 있도록 조성을 조절한 펠렛을 제작하였다. 이 펠렛을 사용하여 $1250^{\circ}C$~$1450^{\circ}C$ 온도에서 각각 15분~45분간 소성실험을 하였다. 슬래그시멘트 클링커 제조에 적합한 최적의 소성조건은 $1450^{\circ}C$에서 20분간 이상 소성하는 조건이었고, 이렇게 제조한 슬래그시멘트를 사용한 모르타르의 압축강도는 보통 포틀란트 시멘트 모르타르보다 우수한 장기 강도를 나타내었다. Reduced and modified converter slag was ball milled and sieved to -200/+325 mesh. CaO,$SiO_2$, $Fe_2$$O_3$ was added to slag powder and mixed to make it similar to the composition of normal portlant cement. The pellet made of this powder was heated from $1250^{\circ}C$ to $1450^{\circ}C$ for 15 min~45 min. Most feasible condition for making slag cement clinker is the heating more than 20 min at $1450^{\circ}C$. The compressive strength of the mortar made of this slag cement clinker was better than that of normal port-lant cement in long time curing.
W/B 및 레드머드 치환율에 따른 고로슬래그 기반 무시멘트 경화체의 강도 및 반응특성에 관한 연구
박선규(Park, Sun-Gyu),김윤미(Kim, Yun-Mi),이상수(Lee, Sang-Soo) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.5
Cement is an important construction materials in the world. However, cement industry the emit carbon dioxide(CO₂) which is a byproduct of a chemical conversion process used in the production of clinker into the atmosphere. Also, carbon dioxide is also emitted during cement production by fossil fuel combustion. There has been a lot of research in order to protect the global environment and to reduce the consumption of cement. This experimental study is purposed to analyze the effect of alkali activator on strength development in order to develop non portland cement concrete using waste resources(paper sludge ash, blast furnace slag and red mud). Various specimens were prepared with water binder ratios and replacement of red mud of alkali activator. The physical properties of these specimens were then investigated by compressive strength and flexural test, energy dispersive spectroscopy(EDS) and observation of micro-structures using scanning electron microscope(SEM). As a results, we find that compressive flexural strength increased with the addition ratios of red mud, but those strengths decreased reversely when addition ratio of some alkali activator were higher. In the EDS of matrix, the calcium hydroxide was possible to quantitative analysis in accordance with water binder ratios and replacement of red mud of alkali activator respectively. The observation result of SEM image, it was shown calcium hydroxide, C-S-H gel etc.. It was judged that results of hydrate analysis of non potland cement matrix binder with kind of water binder ratios and replacement of red mud of alkali activator were useful to basic data for mixtures design and evaluation properties of non portland cement matrix concrete.
박선규(Sun Gyoo Park),김진윤(Jin Yun Kim),라은길(E 대한통증학회 1998 The Korean Journal of Pain Vol.11 No.2
N/A Background: Postoperative bleeding is a common complication in transurethral tesection of prostate (TURP). Some patients become restless and combative after operation, particularly when in pain, producing bleeding from the prostatic bed. So many patients may be necessary to pain control for reduce bleeding. The purpose of this study is to compare recently used two methods for post-operative analgesia. Methods: We studied 40 patients, ASA physical staus 1, 2, undergone TURP under general anesthesia. the patients divided into two groups: continuous epidural pain control group g, n=20) received an epidural bolus of morphine 2 mg and 1% lidocaine 10 ml followed by a epidural 0.08% bupivacaine 40 ml and morphine 4.5 mg (basal infusian rate 0.5 ml/hr), intravenous patient-controlled analgesia (IV-PCA) group (II, n=20) received an intravenous bolus of fentanyl 50-100 μg followed by a IV-PCA morphine 30 mg, ketorolac 180 mg and droperdol 2.5 mg (basal infusion rate 0.5 ml/hr, bolus 0.5 ml, lock-out interval 15 min). This study conducted the analgesic efficacy, side effect and patient's satisfaction for 1 day after TURP. Results: Continuous epidural pain control group had more significant analgesia than IV-PCA at postoperative 30, 60 min, but no significant difference was observed later in both group. Nausea and pruritus were scantly developed in both group but the incidence was no significant differeance. Patients responded good satisfaction over 70% in both group. Conclusions: Postoperative continuous epidural pain block and IV-PCA are both effective methods of postoperative pain control with lower incidence of side effects.