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폴리비닐실록산 치과용 고무인상재의 친수성 향상을 위한 계면활성제의 응용과 물성에 미치는 영향
박영준 ( Yeong Joon Park ),황문진 ( Moon Jin Hwang ),김민강 ( Min Kang Kim ),송호준 ( Ho Jun Song ),하광 ( Kwang Ha ),강신영 ( Shin Young Kang ) 한국고무학회 2008 엘라스토머 및 콤포지트 Vol.43 No.2
This study was purposed to investigate the effects of surfactants and fillers on physical properties of hydrophilic polyvinylsiloxane dental impression materials (PVS). Incorporation of surfactants enhanced the hydrophilicity of the PVS, however, it induced increased viscosity and permanent deformation ratio, delayed setting, and decreased tensile strength. At high concentrations of surfactant, the tensile strength was observed to decrease significantly due to the internal pore formation. Especially, the hydrophilicity of the PVS was significantly enhanced with the addition of Silwet L-77. However, the viscosity, strain in compression, pore formation, and setting time increased whereas the elastic recovery rate and strength remarkably decreased. The PVS dental materials containing Span 20 showed the lowest degree of viscosity increase, delayed setting, pore formation, and hydrophilicity. The delayed setting, pore formation, and strength decrease caused by the incorporation of surfactant were improved by substituting the crystalline quartz filler with diatomaceous earth while the contact angle of PVS dental materials increased.
멀티모달 패션 추천 대화 시스템을 위한 개선된 트랜스포머 모델
박영준(Yeong Joon Park),조병철(Byeong Cheol Jo),이경욱(Kyoung Uk Lee),김경선(Kyung Sun Kim) 한국콘텐츠학회 2022 한국콘텐츠학회논문지 Vol.22 No.1
최근 챗봇이 다양한 분야에 적용되어 좋은 성과를 보이면서 쇼핑몰 상품 추천 서비스에도 챗봇을 활용하려는 시도가 많은 이커머스 플랫폼에서 진행되고 있다. 본 논문에서는 사용자와 시스템간의 대화와 패션 이미지 정보에 기반해 사용자가 원하는 패션을 추천하는 챗봇 대화시스템을 위해, 최근 자연어처리, 음성인식, 이미지 인식 등의 다양한 AI 분야에서 좋은 성능을 내고 있는 트랜스포머 모델에 대화 (텍스트) 와 패션 (이미지) 정보를 같이 사용하여 추천의 정확도를 높일 수 있도록 개선한 멀티모달 기반 개선된 트랜스포머 모델을 제안하며, 데이터 전처리(Data preprocessing) 및 학습 데이터 표현(Data Representation)에 대한 분석을 진행하여 데이터 개선을 통한 정확도 향상 방법도 제안한다. 제안 시스템은 추천 정확도는 0.6563 WKT(Weighted Kendall’s tau)으로 기존 시스템의 0.3372 WKT를 0.3191 WKT 이상 크게 향상시켰다. Recently, chatbots have been applied in various fields and have shown good results, and many attempts to use chatbots in shopping mall product recommendation services are being conducted on e-commerce platforms. In this paper, for a conversation system that recommends a fashion that a user wants based on conversation between the user and the system and fashion image information, a transformer model that is currently performing well in various AI fields such as natural language processing, voice recognition, and image recognition. We propose a multimodal-based improved transformer model that is improved to increase the accuracy of recommendation by using dialogue (text) and fashion (image) information together for data preprocessing and data representation. We also propose a method to improve accuracy through data improvement by analyzing the data. The proposed system has a recommendation accuracy score of 0.6563 WKT (Weighted Kendall’s tau), which significantly improved the existing system’s 0.3372 WKT by 0.3191 WKT or more.
IP분석을 이용한 친환경 컨테이너터미널 운영기술에 관한 연구
박영준(Park, Yeong-Joon),박희정(Park, Hee-Jung) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.7
본 연구는 현재 우리나라 컨테이너터미널에 적용가능한 친환경 운영기술 요인들을 도출하고, 관련 실무자들을 대상 으로 한 실증분석을 통하여 친환경 컨테이너터미널 운영기술들에 대한 항목별 중요도와 만족도의 차이를 Importance- Performance Analysis로 검증함으로써 친환경 컨테이너터미널 운영기술에 대한 향후 방안을 제시하고자 하였다. 본 연구의 결과로 친환경 컨테이너터미널 운영기술 평가항목들 중 ‘빈이동 최소화’가 가장 중요한 요소로, ‘전기식 TC’가 가장 만족한 항목으로 분석되었다. 20개의 친환경 컨테이너터미널 운영기술 항목들은 ‘터미널 안벽시스템’, ‘터미널 야드시스템’, ‘터미널 접안지원 시스템’의 3개 요인으로 도출되었다. 이러한 결과들은 향후 우리나라 친환경 컨테이너터미널에 관련한 운영 정책수 립 및 관리지침에 기여할 것으로 기대된다. This study examine operating system for eco-friendly container terminal and shows the usefulness of the Importance-performance analysis grid in evaluating container terminal operating technology. Importance-performance analysis enables management to evaluate and identify the major strengths and weaknesses of eco-friendly container terminal operating technology’s key success factors. This study identified a list of 20 items from the eco-friendly container terminal literature reviews, and each item was rated using a 5-point Likert scale. Responses were obtained from 250 questionnaires. The importance-performance grid shows that 13 items fall into the “Keep up the good work” quadrant, 2 items fall into the “Concentrate here” quadrant, 2 items fall into the “Low priority” quadrant, and 3 items fall into the “Possible overkill” quadrant. The findings suggest that an eco-friendly container terminal operating technology is necessary to enhance eco-friendly operating system. The results are useful in identifying areas for strategic focus to help container terminal managers develop eco-friendly container terminal operating technology strategies.
올세라믹 심미 수복재료의 최신 동향과 적합한 시멘트 선택 및 사용
박영준(Yeong-Joon Park) 대한치과의사협회 2020 대한치과의사협회지 Vol.58 No.7
Recently, there are much improvement in optical and mechanical properties of dental ceramic materials coupled with improved fabrication techniques, which have caused a considerable shift in the preference of the dentists to ceramic restorations. Because the chemical composition and microstructure of all-ceramic materials are different by the type, correct choice of cement type and surface treatment procedure, and cementation strategy is essential for the success of ceramic restorations with adequate retention and decreased incidence of complications. This manuscript reviews on the most often prescribed and some newly developed ceramic materials, and the selection criteria and usage guidelines of cement materials that are used in conjunction with various ceramic materials. This manuscript emphasizes that continuous updating the information of newly developed ceramic and cement materials and application techniques by the dentists and dental staffs are demanding in response to the constantly improving ceramic and cement materials and corresponding application protocol changes.
습식 분무 열분해 방법으로 제조한 코발트 도핑된 티타늄 산화막의 표면 및 광학적 특성
송호준,박영준,Song Ho-Jun,Park Yeong-Joon 한국재료학회 2005 한국재료학회지 Vol.15 No.3
Titanium dioxide films $(TiO_2)$ doped cobalt transition metal were prepared on titanium metal by water spray pyrolysis technique. Micro-morphology, crystalline structure, chemical composition and binding state of sample groups were evaluated using field emission scanning microscope(FE-SEM), X-ray diffractometer(XRD), Raman spectrometer, X-ray photoelectron spectrometer(XPS). $TiO_2$ films of rutile structure were predominately formed on all sample groups and $Ti_2O_3$ oxide was coexisted on the surface of cobalt doped-sample groups. The optical absorption peaks measured by using UV-VIS-NIR spectrophotometer were observed at specific wavelength region in sample groups doped cobalt ion. This result could be analyzed by introducing crystal field theory.
금전착이 치과용 합금과 전장 레진간의 접착 강도에 미치는 영향
양홍서,박영준,Yang, Hong-So,Park, Yeong-Joon 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.1
The purpose of this experiment was to determind whether the gold electrodeposit on Pd-Ag and Ni-Cr alloys influences on the shear bond strength between veneering resin and silicoated metal surface. All the metal specimens were sandblasted with $250{\mu}m$ aluminum oxide and followed by silicoating and resin veneering. According to the metal surfaces to be veneered, experimental groups were divided into five. Group Prec : Gold alloy without gold coating Group Semi : Pd-Ag alloy without gold coating Group Base : Ni-Cr alloy without gold coating Group Semi-G : Pd-Ag alloy with gold coating Group Base-G : Ni-Cr alloy with gold coating All specimens were thermocycled 1,000 times at temperature of $5^{\circ}C$ to $55^{\circ}C$. The effects of gold electrodeposit on the shear bond strength between resin and metal interface were measured and fractured surface of the resin veneered metal was examined under the scaning electron microscope. The following results were obtained 1. The shear bond strength between resin and metal was $64.51{\pm}11.11Kg/cm^2$ in Prec group, $62.77{\pm}11.23Kg/cm^2$ in Base group and $58.97{\pm}9.20Kg/cm^2$ in Semi Group. There was no significant difference among the groups. 2. The bond strength in groups Semi-G and Base-G decreased about 17%, compared to the nongold-electrodeposit groups(Semi, Base). 3. In groups of non electrodeposit(Prec, Semi, Base), fracture occurred at the interface between alloy and resin, while fracture interface was observed between gold coating and resin in group Semi-G, and between metal substrate and gold coating in group Base-G respectively.
Pd-Ag 및 Ni-Cr 합금의 금 전착이 전장 레진의 색채에 미치는 영향
양홍서,박영준,Yang, Hong-So,Park, Yeong-Joon 대한치과보철학회 1995 대한치과보철학회지 Vol.33 No.4
As the mechanical property of composite resin improved, composite resin has been widely used esthetic dentistry. In the field of esthetic dentistry, the color of prosthetic material is very important. The purpose of this study was to evaluate the color difference of specimens, by the types of alloys and gold electrodeposit. Experimental groups were as follows : Group Prec : Au-Pt alloy with no gold coating and no resin veneer. Group Semi : Pd-Ag alloy with no gold coating and no resin veneer. Group BAse : Ni-Cr alloy with no gold coating and no resin veneer. Group Gsem : Pd-Ag alloy with no gold coating and no resin veneer. Group Gbas : Ni-Cr alloy with no gold coating and no resin veneer. Group PreR : Resin veneer on the Pd-Ag alloy without gold coating. Group SemR : Resin veneer on the Pd-Ag alloy without gold coating. Group GbsR : Resin veneer on the Ni-Cr alloy with gold coating Group BasR : Resin veneer on the Ni-Cr alloy without gold coating. In this study, colors of metal surfaces and veneered resins were evaluated by the CIE $L^{*}a^{*}b$ system. The results obtained were as follows : 1. different alloy types and gold coating make the $L^{*}a^{*}b$ system. 2. The ${\Delta}E^*$ab value between groups semi and Base was less than 1.5 and there was no $a^*$ and $b^*$ value difference between groups Gsem and Gbas 3. The values of $L^*$ and $a^*$ ain groups GsemR and GbasR were so similar that the ${\Delta}E^*$ab value was as small as 0.58. 4. In resin specimens with gold coated semiprecious or base alloys showed yellower and redder deviation than the resin specimens with precious alloy. 5. The ${\Delta}E^*$ab values between goups PreR-GsemR and groups PreR-GbasR were as small as 2.68 and 2.22 respectively.