• Polymer(Korea)
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• v.30 no.3
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• pp.202-206
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• 2006

The plasticized cellulose diacetate (CDA) was prepared by melt processing methods using triacetine (TA) as a plasticizer. Additionally, processability of CDA was enhanced by using epoxidized soybean oil as a secondary plasticizer. The glass transition temperature of plasticized CDA was observed at $50^{\circ}C$ lower than virgin CDA and the incorporation of 5% ESO also resulted in the additional $20^{\circ}C$ decrease in the $T_g$. The tensile properties and modulus of plasticized CDA were better than commercial PP and PLA. The aerobic biodegradability of CDA in controlled compositing condition resulted in 90% of degradation during 60 days.

• Polymer(Korea)
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• v.33 no.3
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• pp.243-247
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• 2009

Cellulose diacetate (CDA) was plasticized with triacetine (TA) and epoxidized soybean oil (ESO) in a high speed mixer. Composites of plasticized CDA and zeolite were prepared by a melting process. The $T_g$ value, $106^{\circ}C$ of the plasticized CDA was confirmed by DMA analysis. The $T_g$ value of the CDA with 50% zeolite was $125^{\circ}C$. As the content of zeolite was increased from 10 to 50% the modulus of the composite was increased from 1.7to 3.6 GPa by two times over the plasticized CDA, and its tensile strength was increased to 62 MPa and then decreased down 51 MPa, and its elongation was increased to 10% and then decreased down 3.2%. In the SEM image, the compatibility between CDA and zeolite was observed. Increasing the amount of zeolite in the composites resulted in further enhancement of the $CH_3COOH$ absorption effects.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.835-837
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• 2003

본 논문에서는 병원간의 정보를 교환하기 위한 목적으로 정의된 의료 분야의 표준기관인 HL7에서 제안하는 Clinical Document Architecture(CDA)문서를 관리하기 위한 시스템을 제안한다. CDA Manager라는 이 시스템은 각 병원의 관계형 데이터베이스인 CDA local repository에서 CDA문서를 저장, 검색, 수정의 기능을 제공한다. 본 논문에서는 XML로 기술된 CDA문서의 특성을 살려 테이블을 설계하고 검색속도를 향상시켰다.

• Journal of KIISE:Software and Applications
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• v.34 no.10
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• pp.918-928
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• 2007

The goal of this paper is to propose a new way to register CDA documents in CDR (Clinical Document Repository) that is proposed by the author earlier. One of the methods is to use a manifest archiving for seamless references and visualization of CDA related files. Another method is to enhance the CDA security level for supporting pseudonymization of CDA. The former is a useful method to support the bundled registration of CDA related files as a set. And it also can provide a seamless presentation view to end-users, once downloaded, without each HTTP connection. The latter is a new method of CDA registration which can supports a do-identification of a patient. Usually, CDA header can be used for containing patient identification information, and CDA body can be used for diagnosis or treatment data. So, if we detach each other, we can get good advantages for privacy protection. Because even if someone succeeded to get separated CDA body, he/she never knows whose clinical data that is. The other way, even if someone succeeded to get separated CDA header; he/she doesn't know what kind of treatment has been done. This is the way to achieve protecting privacy by disconnecting association of relative information and reducing possibility of leaking private information. In order to achieve this goal, the method we propose is to separate CDA into two parts and to store them in different repositories.

• Progress in Superconductivity and Cryogenics
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• v.18 no.3
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• pp.25-29
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• 2016

A quench detection system of KSTAR Poloidal Field (PF) coils is inevitable for stable operation because normal zone generates overheating during quench occurrence. Recently, new voltage quench detection method, combination of Central Difference Averaging (CDA) and Mutual Inductance Compensation (MIK) for compensating mutual inductive voltage more effectively than conventional voltage detection method, has been suggested and studied. For better performance of mutual induction cancellation by adjacent coils of CDA+MIK method for KSTAR coil system, balance coefficients of CDA must be estimated and adjusted preferentially. In this paper, the balance coefficients of CDA for KSTAR PF coils were numerically estimated. The estimated result was adopted and tested by using simulation. The CDA method adopting balance coefficients effectively eliminated mutual inductive voltage, and also it is expected to improve performance of CDA+MIK method for quench detection of KSTAR PF coils.

• International journal of advanced smart convergence
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• v.1 no.2
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• pp.47-51
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• 2012

In highly developed society, information and communication technologies are widely used for better medical services. These information and communication technologies should be more and more acceptable in all hospitals for exchange medical records. EMR becomes more convenient than the previously used paper charts. It will be able to record medical institutions every time and dual treatment. Each is different specifications for each medical institution to use the program or document to exchange it. The personal clinic records still does not exchange well. To solve this gap between medical alienation, this paper describes the concepts of HL7-CDA and proposes types of telemedicine system. To resolve time and space constraints, new form of treatment methods presents in future directions after described about related systems. CDA enables electronic medical records to the each medical center and gradually expanded by exchanging the patient's medical records. This paper is using XML-based CDA documents as a hierarchical for medical information exchange standards compliant HL7-CDA documents. It could be possible currently used structural variety of multimedia data. Thus It is able to send and receive HL7-CDA-based medical information and clinical information to identify the medical institutions of medical information with interchange system design and building standards, and through mutual exchange of clinical information.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.464-464
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• 2012

본 연구에서는 DBD (Dielectric Barrier Discharge)방식을 통해 발생된 대기압 plasma를 이용한 Photoresist (PR) Ashing에 관한 연구를 하였다. 사용된 DBD 반응기는 기존의 blank planar plate 형태의 Power가 인가되는 anode 부분과 Dielectric Barrier 사이 공간을 액상의 도전체로 채워 넣은 형태의 전극이 사용 하였으며, 인가 Power는 40 kHz AC 최대 인가 전압 15 kV를 사용 하였고(본 연구에서 인가 power는 30 KHz,전압 14 KV를 고정시킴) 플라즈마를 발생시 라디칼의 활성화를 유지하기 위해 전극 온도가 $180^{\circ}C$ 정하였다. Feeding 가스는 N2, 반응가스로는 CDA(Clean Dry Air), SF6와 CF4가스를 사용 하였으며 모든 공정은 In-line type으로 시편을 처리 하였다. CDA ratio의 경우에 질소대비 0.2%때 이송속도 30 mm/sec 1회 처리 기존 PR ashing은 최대 $320{\AA}$의 ashing 두께를 얻을 수 있었다. SF6와 CDA가스를 같이 반응하는 경우 ratio는 CDA : SF6 = 0.6% : 0.6%에서 PR ashing rate이 $841{\AA}/pass$의 값을 얻을 수 있었고, CDA가스만 첨가하는 경우보다 약2.6배 증가함을 관찰할 수 있었다. CF4 가스를 사용하는 경우 ratio는 CDA : CF4 = 0.2% : 0.2%에서 PR ashing rate이 $687{\AA}/pass$의 값을 얻을 수 있으며 CDA가스만 첨가하는 경우보다 약 2.1배 증가함을 관찰할 수 있었다. 그리고 PR ashing rate가 가스첨가종류와 비율에 따라서 변화함을 관찰하였고 최적조건을 찾기 위해 연구를 진행하였다. 추후 PR ashing rate가 향상을 하기 위해 가스혼합비율 및 stage 온도등 조건을 조절하여 공정최적조건을 얻기 위해 연구를 진행하였다.

• Neurospine
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• v.15 no.4
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• pp.296-305
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• 2018

Cervical disc arthroplasty (CDA), or total disc replacement, has emerged as an option in the past two decades for the management of 1- and 2-level cervical disc herniation and spondylosis causing radiculopathy, myelopathy, or both. Multiple prospective randomized controlled trials have demonstrated CDA to be as safe and effective as anterior cervical discectomy and fusion, which has been the standard of care for decades. Moreover, CDA successfully preserved segmental mobility in the majority of surgical levels for 5-10 years. Although CDA has been suggested to have long-term efficacy for the reduction of adjacent segment disease in some studies, more data are needed on this topic. Surgery for CDA is more demanding for decompression, because indirect decompression by placement of a tall bone graft is not possible in CDA. The artificial discs should be properly sized, centered, and installed to allow movement of the vertebrae, and are commonly 6 mm high or less in most patients. The key to successful CDA surgery includes strict patient selection, generous decompression of the neural elements, accurate sizing of the device, and appropriately centered implant placement.

• Microbiology and Biotechnology Letters
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• v.33 no.1
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• pp.9-15
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• 2005

Chitin deacetylase (CDA; EC 3.5.1.41) catalyzes the hydrolysis of N-acetamide bonds of chitin, converting it to chitosan. Chitosan has several applications in areas such as biomedicine, food ingredients, cosmetics, pharmaceuticals, and agriculture. In this paper, occurrence, assay and purification protocols, enzymatic characteristics, substrate specificity, and mode of action of microbial CDAs have been described. Several lines of evidence have substantiated the biological roles involved in cell wall formation and plant-pathogen interactions for fungal CDAs. The gene structure of CDAs has been compared with other family 4 carbohydrate esterases which deacetylate a wide variety of acetylated poly/oligo-saccharides. The use of CDAs for the conversion of chitin to chitosan, in contrast to the presently used chemical procedure, offers the possibility of a controlled, non-degradable process, resulting in the production of well-defined chitosan oligomers and polymers. Insect pathogen that can secrete high levels of chitin-metab­olizing enzymes including CDA can be a possible alternative for new pest management tools.

• Polymer(Korea)
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• v.30 no.1
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• pp.70-74
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• 2006

Plasticized cellulose diacetate(CDA) was prepared by homogenizing cellulose diacetate(CDA), triacetin(TA) and epoxidized soybean oil (ESO) in a high-speed mixer, then the CDA mixture was mixed with ramie fiber to produce a green composite material. In DMA analysis, the glass transition temperature of plasticized CDA and the composite was observed at $85\;^{\circ}C\;and\;140\;^{\circ}C$, respectively. A composite reinforced with alkali treated ramie fiber exhibited significantly higher mechanical properties, such as $15\;^{\circ}C$ increase in tensile strength as well as $41\;^{\circ}C$ increase in Young's modulus when compared with commercial polypropylene. In the SEM image analysis, much enhanced adhesion between plasticized CDA and alkali treated ramie fiber (AIRa) was observed.