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Dental radiology reporting status and recording frequency of reporting items in Korea
Choi Jinwoo 대한영상치의학회 2023 Imaging Science in Dentistry Vol.53 No.1
Purpose: This study investigated the current dental radiology reporting methods and the recording rate of 10 mandatory reporting items in Korea. Materials and Methods: An original online survey created using Google Forms was distributed to dental practitioners. The survey asked about the participants’ age, experience, workplace, use of radiologic equipment, radiology reporting methods, and recording reporting items. Results: In total, 354 responses were analyzed. Radiologic reporting in dental charts was the most commonly used method for each modality. Four out of 10 mandatory items were recorded at a high rate, but the remaining 6 items had substantially lower recording rates, often below 50%. The participants who reported radiographic findings through other separate methods had higher item scores than those who wrote findings in dental charts (P<0.05). Conclusion: Radiologic societies and dental associations should encourage the use of separate reports for radiographic examinations. Education regarding radiology reports and the justification for reporting items should be reinforced in dental schools, training courses on radiology, and the continuing education curriculum.
Jinwoo Choi,서영수,Wan-Gyu Lee,정종완 한국물리학회 2013 Current Applied Physics Vol.13 No.7
The high contact resistance of organic thin film transistors (OTFTs), due to the work function difference between metal electrode and organic channel, seriously decreases the electrical properties. Graphene electrode could reduce the contact resistance and improve the electrical performance of OTFTs. However,the high chemical vapor deposition (CVD) temperature (900e1000 C) limits the available OTFT substrate in the case of direct graphene growth on S/D metal electrodes. Furthermore, the application of a transferred graphene electrode induces significant problems due to the transfer process. In this work,thin graphite sheet was directly grown on a metal electrode by the inductively coupled plasma-chemical vapor deposition (ICP-CVD) method at as low temperature as 400, 500 C. We show that OFETs with thin graphite sheet/metal, grown at 400, 500 C, exhibit much lower contact resistance than OFETs with metal-only electrode.
Effects of Mesh Planes on Signal Integrity in Glass Ceramic Packages for High-Performance Servers
Choi, Jinwoo,Altabella Lazzi, Dulce M.,Becker, Wiren D. The Korean Institute of Electromagnetic Engineerin 2013 전자파기술 Vol.24 No.2
This paper discusses effects of mesh planes on signal integrity in high-speed glass ceramic packages. One of serious signal integrity issues in high-speed glass ceramic packages is high far-end (FE) noise coupling between signal interconnects. Based on signal integrity analysis, a methodology is presented for reducing far-end noise coupling between signal interconnects in high-speed glass ceramic modules. This methodology employing power/ground mesh planes with alternating spacing and a via-connected coplanar-type shield (VCS) structure is suggested to minimize far-end noise coupling between signal lines in high-speed glass ceramic packages. Optimized interconnect structure based on this methodology has demonstrated that the saturated far-end noise coupling of a typical interconnect structure in glass ceramic modules could be reduced significantly by 73.3 %.
Development of Centering Method for Automatic Generation of a Quadrilateral Mesh
Choi, Jinwoo Society for Computational Design and Engineering 2011 International Journal of CAD/CAM Vol.11 No.1
A new method has been developed in this paper for automatic quadrilateral mesh generation for a two-dimensional domain. The method is named 'centering method' because it centers a point at the domain and then divides it into sub-domains using cutting lines from the center point. Each of the cutting lines is selected based on the criterion using the angles between the boundary of the domain and the cutting line. The decomposition of the domain into sub-domains is repeated until every subdomain has four or six nodes. Pre-defined splitters are used to divide six-node domains into quadrilateral elements depending on their configuration and presence on the boundary of the initial domain. Arbitrary domains are meshed as examples to verify the robustness of the new method.
Effects of Mesh Planes on Signal Integrity in Glass Ceramic Packages for High-Performance Servers
Jinwoo Choi,Dulce M. Altabella Lazzi,Wiren D. Becker 한국전자파학회 2013 전자파기술 Vol.24 No.2
This paper discusses effects of mesh planes on signal integrity in high-speed glass ceramic packages. One of serious signal integrity issues in high-speed glass ceramic packages is high far-end (FE) noise coupling between signal interconnects. Based on signal integrity analysis, a methodology is presented for reducing far-end noise coupling between signal interconnects in high-speed glass ceramic modules. This methodology employing power/ground mesh planes with alternating spacing and a via-connected coplanar-type shield (VCS) structure is suggested to minimize far-end noise coupling between signal lines in high-speed glass ceramic packages. Optimized interconnect structure based on this methodology has demonstrated that the saturated far-end noise coupling of a typical interconnect structure in glass ceramic modules could be reduced significantly by 73.3 %.
Risk factors for external root resorption of maxillary second molars associated with third molars
Choi, Jinwoo Korean Academy of Oral and Maxillofacial Radiology 2022 Imaging Science in Dentistry Vol.52 No.-
Purpose: This study aimed to evaluate the diagnostic performance of panoramic images compared to cone-beam computed tomography (CBCT) imaging for maxillary third molar (M3)-associated external root resorption (ERR), and to identify the risk factors of ERR on panoramic images. Materials and Methods: The study population was composed of all patients who underwent panoramic imaging at Dankook University Dental Hospital from May to October 2019. In total, 397 cases of maxillary M3s in 247 patients(147 men and 100 women) were included. The diagnostic accuracy of ERR in panoramic images compared to CBCT images was evaluated using the chi-square test. To identify risk factors for ERR, dental records and panoramic findings were evaluated by logistic regression analysis. Results: The diagnostic accuracy of ERR on panoramic images was 0.79 compared to CBCT images (P<0.05). Superimposition of M3s onto second molars (M2) was associated with an approximately 33 times higher risk of ERR than separated M3s(P<0.05). Impacted M3s showed a 5 times higher risk of ERR than erupted M3s(P<0.05). Conclusion: ERR related to M3s is a common clinical condition, and superimposition of M3 onto M2 on panoramic images was the most important risk factor for ERR. It seemed that CBCT examinations for maxillary M3s might be indicated for ERR diagnosis especially if panoramic radiographs show superimposition of M3 onto M2. Impaction itself was also a risk factor, and it should be carefully examined.