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준보석 가루를 이용한 수지 상감을 위한 접착제로써 UV 레진 활용 방안 연구
조민희(Jo, Mini Angela),정신혜(Chung, Shin Hye) 한국조형디자인학회 2021 조형디자인연구 Vol.24 No.4
상감기법은 분야마다 그 종류와 재료가 다양하다. 금속공예에는 기법에 따라 많은 종류의 상감이 존재하며, 그 중에서 금속의 표면을 깎아내어 음각을 낸 후, 접착제를 사용하여 준보석 가루를 메꾸는 장식기법을 준보석가루상감이라고 한다. 준보석가루상감을 위한 접착제로 시아노아크릴레이트(CA: Cyanoacrylate)성분이 들어간 CA순간접착제를 사용하는데, CA순간접착제는 경화시간이 짧은 성질을 가지고 있기 때문에 작업시간에 제한이 있다. UV(Ultraviolet)레진은 자외선에 노출이 되었을 때 경화가 시작하기 때문에, 작업시간을 조절할 수 있다는 장점을 가지고 있었다. 준보석가루상감의 접착제로서 가장 중요한 조건은 접착력이기 때문에, 시중에 판매되고 있는 세 가지의 UV레진재료를 선정하여 접착력 실험을 실행했다. 접착력의 실험방법으로는 금속의 표면처리와 준보석의 입자크기에 변화를 주었다. 실험을 통하여 새로운 접착방식의 접착제로 크리진 고점도 레진을 제안하며, 볼버 표면처리와 입자크기는 80 메시를 추천한다. 이 새로운 방식을 준보석가루상감에 도입하였고, 실제 실기작업에 응용하였다. Crushed Stone Inlay is a metalsmithing technique in which semi-precious stones are adhered in empty cavities on metal surfaces with an adhesive. The most common adhesive used in this technique is cyanoacrylate(CA) based super glues. CA super glues are quick bonding adhesives, but due to its short working time it is not an effective adhesive to use in crushed stone inlay work. To suggest an adhesive with prolonged working time, this study aimed to evaluate Ultraviolet(UV) curing resin materials as adhesives to achieve longer working time and cure on demand. The most important feature of the UV resin as an adhesive in crushed stone inlay is adhesion properties. The performance of three different UV resins, Mostive Base Gel, Crysin UV heavy resin and M. Brid M.glue were evaluated under various conditions; the texture of the metal surface, the size of the lapis lazuli pieces. As a result, this study recommends a new method of adhering crushed stones for inlay work using Crysin UV heavy resin with lapis lazuli sifted in 80 mesh in conjunction with metal surface textured by a ball bur. This method is then practiced in making decorative surfaces on metalworks.
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Ga-Young Kim,Sunyoung Kim,Mini Jo,Hye Yoon Seol,Young Sang Cho,Jihyun Lim,Il Joon Moon 대한의학회 2022 Journal of Korean medical science Vol.37 No.12
Background: Hearing loss (HL) is the most common chronic disease and has been linked to negative health outcomes. Hearing aids (HAs) are regarded as the gold standard for HL management, however, the adoption rate of HAs is relatively low for various reasons. With this background, hearing devices, such as personal sound amplification products (PSAPs) received significant attention as an alternative to conventional HAs. This study aimed to evaluate the clinical efficacy of PSAPs in patients with mild to moderately severe HL. Methods: Nineteen patients with mild hearing loss (MHL), 23 with moderate hearing loss (MDHL), and 15 with moderately severe hearing loss (MSHL) participated in the study. Electroacoustic analysis, simulated real-ear measurements (REMs), and three clinical evaluations were implemented. Results: All devices satisfied the electroacoustic tolerances. All devices provided sufficient gain for MHL and MDHL audiograms. However, in MSHL audiogram, the gains of PSAPs were insufficient, especially for high frequencies. In terms of clinical evaluations, soundfield audiometry showed significant improvements between aided and unaided thresholds in all groups for all devices (P < 0.001). Significant improvements of word recognition scores were only shown for HAs between aided and unaided conditions. The Korean version of the Hearing In Noise Test did not show any consistent findings for all devices and groups. Conclusion: Certain PSAPs are beneficial for improving hearing and speech perception in patients with HL. Well-chosen PSAPs could be an alternative hearing rehabilitation option for these patients.
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Percutaneous Bone-Anchored Hearing Implant: Is It Clinically Useful in Korean?
Sung Min Koh,조영상,Ga-Young Kim,Mini Jo,Hye Yoon Seol,Il Joon Moon 대한의학회 2022 Journal of Korean medical science Vol.37 No.23
Background: The aim of this study is to investigate the clinical effectiveness of Ponto in Korea, a recently released percutaneous bone-anchored hearing implant. Methods: 16 patients with single-sided deafness (SSD) and mixed or conductive hearing loss who underwent Ponto implantation from December 2018 to September 2020 were enrolled in the study. Puretone audiometry, the Korean version of the Hearing in Noise Test (K-HINT), sound localization test (SLT), and Pupillometry were performed pre- and three months post-operation. Standardized questionnaires, the Hearing Handicap Inventory for the Elderly (HHIE) and Speech, Spatial and Qualities of Hearing Scale (SSQ), were administered. Results: The mean age of subjects was 55.5 (range, 48–67) years. Four males and 12 females participated in the study. The mean puretone average was 73.17 dB hearing level (HL) before surgery and significantly improved to 36.72 dB HL three months after surgery. The mean word recognition score improved from 26.0% to 90.75% after implantation. In the case of K-HINT, there was a significant difference in summation (Z = −2.250, P = 0.024) and head shadow effects (Z = −3.103, P = 0.002). There was no significant difference in root mean square error degree (RMSE) and hemifield identification scores for SLT testing. Pupillometry was performed to measure listening effort and the results revealed that the degree of pupillary dilatation decreased under the condition of quiet, 0 dB signal to noise ratio (SNR) and 3 dB SNR. The total score for HHIE decreased significantly (Z = −3.130, P = 0.002) while the SSQ score increased significantly (Z = −2.216, P = 0.027). Conclusions: The Ponto bone-anchored hearing system showed significant clinical benefit in Korean patients with conductive and mixed hearing loss and SSD.
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