하악 과두에 이환된 악골 골수염

박주현,권정승,안형준,김성택,최종훈,Park, Ju-Hyun,Kwon, Jeong-Seung,Ahn, Hyung-Joon,Kim, Seong-Taek,Choi, Jong-Hoon 대한안면통증구강내과학회 2008 Journal of Oral Medicine and Pain Vol.33 No.4

Osteomyelitis is considered an inflammatory condition of bone that usually begins as an infection of the medullary cavity and quickly extends to periosteum of the area. Early acute osteomyelitis of the mandible is usually characterized by deep, intense pain, high intermittent fever, paresthesia or anesthesia of the lower lip and a clearly identifiable cause. If the disease is not controlled or inadequately treated after onset, acute osteomyelitis progresses to a chronic form. The diagnosis of mandibular osteomyelitis rests on processing for identification of microbiologic isolates and on imaging studies to determine the extent of disease. Mandibular osteomyelitis often is associated with involvement of the masticator space and can exhibit symtoms similar to temporomandibular disorder including orofacial pain and limited mouth opening. Advanced imaging modalities can be helpful in obtaining a proper diagnosis.

GNP법을 이용한 고체산화물 연료전지의 공기극용 La_0.75Sr_0.25FeO₃의 제조 및 특성

박주현,손희정,임탁형,이승복,윤기석,윤순길,신동열,송락현,Park, Ju-Hyun,Son, Hui-Jeong,Lim, Tak-Hyoung,Lee, Seung-Bok,Yun, Ki-Seok,Yoon, Soon-Gil,Shin, Dong-Ryul,Song, Rak-Hyun 한국전기화학회 2007 한국전기화학회지 Vol.10 No.1

Glycine Nitrate Process(GNP)를 이용하여 $La_{0.75}Sr_{0.25}FeO_3$를 합성하였다. 이때, GNP의 글리신의 함량은 화학양론식으로 계산하여 3.17mol을 첨가하였다. ICP-AES분석으로 각각의 조성 함량을 조사하고, XRD, SEM분석으로 합성된 분말의 결정성과 입자크기를 분석하였다. 이렇게 분석한 분말은 일축가압 성형으로 펠렛을 제조하였으며, 이 시편은 $1200^{\circ}C$에서 소결하였다. 소결된 시편은 아르키메데스 법을 이용하여 소결밀도를 측정히였다. 전기화학적 성능을 평가하기 위해 AC impedance spectroscopy로 측정하였으며, GNP 법으로 합성된 LSF가 기존의 LSM 보다 낮은 Ohmic resistance및 Polarization resistance를 보임을 확인하였다. 또한 합성된 LSF를 양극으로 사용하여 연료극 지지체식 고체산화물 연료전지의 단위전지를 제작하였으며, 그 성능은 $750^{\circ}C$에서 $342mW/cm^2(0.7V,\;488mA/cm^2)$을 나타내었다. 마지막으로 임피던스 분석에 의하여 단위전지의 전기화학적 분극저항을 평가하였다. We synthesized and investigated $La_{0.75}Sr_{0.25}FeO_3$ by Glycine Nitrate Process(GNP) method used as cathode materials for SOFC(solid oxide fuel cell). Optimized amount of glycine is 3.17 mol. ICP elemental composition analysis indicated that the stoichiometry of the synthesized powders have nearly nominal values. SEM images and XRD patterns reveal that the synthesized powder has uniform size distribution and high degree of crystallinity. The sample powders were isostatically pressed to form a pellet. The green body was sintered at $1200^{\circ}C$ and the relative density of the sintered specimens were measured by Archimedes mettled. We measured electrochemical performance of LSF by AC impedance spectroscopy. Resistance of LSF shows lower value than that of LSM throughout all temperature region. The anode-supported solid oxide fuel cell showed a performance of $342mW/cm^2(0.7V,\;488mA/cm^2)$ at $750^{\circ}C$. The electrochemical characteristics of the single cell were examined by at impedance method.

Simple Stability Criterion for Interval Time-Delay Systems with Multiple Delays

박주현,Park, Ju-Hyun The Institute of Electronics and Information Engin 2001 電子工學會論文誌-SC (System and control) Vol.38 No.6

본 단편 논문에서는, 다수의 시간지연을 갖는 구간시간지연 시스템의 점근 안정성을 조사한다. 주어진 시스템의 시간지연에 독립적인 점근 안정 조건 식과 감쇄비를 보장하는 점근 안정 조건 식을 제시한다. 구해진 조건 식은 시스템 행렬들의 조합으로 구성된 행렬의 스펙트럼 반경으로 표시된다. 수치 예를 통하여 결과의 우수성을 보인다. In this note, the asymptotic stability of interval time-delay systems with multiple delays is investigated. Sufficient conditions for the stability independent of delay and decaying rate for the system are derived in terms of the spectral radius. Numerical computations are performed to illustrate the result.

태국 가구 규모에 따른 가정간편식 소비행동

박주현,최승균,홍완수,Park, Ju Hyun,Choi, Seung Gyun,Hong, Wan Soo 한국식생활문화학회 2022 韓國食生活文化學會誌 Vol.37 No.4

This study was conducted to provide basic data for product development and marketing strategies for the Thai home meal replacement (HMR) market, to reflect the changing trends in household sizes in Thailand. The results of analyzing the characteristics and differences of HMR consumption behavior between single-person households and multi-person households in Thailand were as follows: It was found that single-person households use HMR to save money and for the convenience in cooking and preparation. In the preference by HMR type, multi-person households showed a higher preference for all types of products than single-person households. Thai consumers, regardless of their household size, mainly use department stores and large shopping malls to purchase HMR, and they most prefer to get information through Internet advertisements. The shelf life, quality, taste, hygiene, and freshness of HMR were the main considerations for their selection. Based on the results of this study, the Thai market requires the development of HMR products that are reasonable in terms of cost and preparation time. In addition, it is necessary to develop products that can satisfy consumer needs, such as nutritional enhancement and therapeutic foods, products that are organic, eco-friendly, cater to various menus, and address the premium segment.

이동 객체 궤적의 최소경계사각형 영역을 효율적으로 분할하는 알고리즘에 관한 연구

박주현,조우현,Park, Ju-Hyun,Cho, Woo-Hyun 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.1

최근, 무선 네트워크의 발달로 인해 이동 객체에 대한 위치 정보를 수집하여 실생활에 활용하는 다양한 위치 기반 서비스의 증가하고 있다. 그에 따라서, 이동 객체의 연속적인 위치를 효율적으로 검색하는 새로운 색인 구조가 필요하게 되었다. 본 논문에서는 이동 객체의 좌표 사이의 거리가 긴 경우 탐색 공간을 줄이기 위해 효율적으로 분할하는 방법을 제안한다. 궤적의 적절한 분할 위치를 찾아서 평균적인 질의의 크기를 고려하여 형성되는 확장된 최소 경계 사각형(EMBR)의 영역을 이용한다. 추정 분할 방법은 최소경계 사각형을 최소화하게끔 고안되었고 이를 실험하였다. 실험 결과 제안하는 추정 분할 방법이 기존의 방법에 비해서 EMBR의 면적을 더 효율적으로 줄여줌을 알 수 있었다. With the recent development of wireless network technologies, there have been increasing usage of variouse position base servies. Position based services basically collect position information of moving object for the utilization of them in real life. Accordingly, new index structures are required to efficiently retrieve the consecutive positions of moving objects. In the paper, we consider volume of Extended Minimum Bounding Rectangles(EMBR) to be determined by average size of range queries. We proposed the methode that split efficiently moving object with long distance between location, and split moving object for decrease searching space an Estimated-Split algorithm that minimizes the volume of MBRs is designed and simulated. Our experimental evaluation confirms the effectiveness and efficiency of our proposed splitting policy.

납계열 안료의 대기환경에 따른 열화특성

박주현,이선명,김명남,Park, Ju Hyun,Lee, Sun Myung,Kim, Myoung Nam 대한자원환경지질학회 2022 자원환경지질 Vol.55 No.3

We examined degradation characteristics of lead based pigments(white lead, Red lead, Litharge) according to atmospheric environmet condition, for example atmospheric gas(CO₂, NO₂) and soluble salt. Painted samples not changed material compositions but were occured the color change(𝚫E 4~31) after exposed UV irradiation. All sample were not affected by CO₂ gas not only color but chemical composition. However, samples were remakably changed color exposed NO₂ gas and it was formed secondary product like as lead nitrate. Such as red lead and white lead samples' color difference were 𝚫E 2 and 𝚫 10 respectively and became dark, along with litharge became bright and color difference was 𝚫E 5 after react with NO₂ gas. It confirm that NO₂ was influential factor than CO₂ in the case of same concentration. Furthermore salt spray test was taken to figure out soluble salt influence in fine dust. The result showed noticeable color change and secondary product was formed on samples' surface. The glue film peeled off or hole, and color changed around the secondary products. After salt spray, XRD pattern showed decrease peak intensity and lower crystalinity. As a result of salt spray test, white lead was formed new product litharge and litharge was formed litharge and minium. According to the results, influential atmospheric factors for conservation of paint pigments were UV, NO₂, soluble salt, and litharge was most weakness throughout lead base pigments.

문화재 보존 및 복원에 사용되는 천연 광물성안료의 물성평가 - 석청(石靑)중심으로

박주현,정혜영,고인희,정서린,조아현,Park, Ju-Hyun,Jeong, Hye-Yeong,Go, In-Hee,Jeong, Sir-Lin,Jo, A-Hyeon 국립문화재연구소 2015 保存科學硏究 Vol.36 No.-

문화재 수리, 복원재료 및 회화용으로 사용되는 천연광물성 무기안료인 석청의 물리적 특성을 연구하였다. 본 연구를 위해 시중에서 유통되고 있는 청색계열의 안료(KA-한국, JA, JB, JC-일본, CA, CB, CC-중국)를 선정하였다. 연구에 앞서 XRD, XRF분석을 통하여 안료의 결정구조 및 조성을 확인하였으며, 본 연구에 사용된 안료는 Azurite가 주원료임이 확인되었다. 조성물을 확인한 안료는 입도, 색도, 비중, 흡유량 등 물리적 특성을 평가하였으며, 입도에 따른 물리적 특성의 변화를 확인하였다. 안료는 입도가 작아짐에 따라 명도는 커지고, 청색도는 커지다가 다시 작아지는 특성이 있으며, KA가 안료번호에 따라 가장 잘 분급되어 있음을 알 수 있었다. 비중은 입자크기가 커질수록 커지고, 흡유량은 입자크기가 작아질수록 커졌다. 이러한 결과를 토대로 안료의 기초적인 물리적 특성을 규명하고 나아가 문화재 수리, 복원에 선택적으로 사용하는데 도움이 될 것으로 기대한다. The purpose of this study is to analyse the properties of natural mineral pigments used in restoration and conservation of cultural assets. For this study blue-based pigments that are sold in market were selected. The component analysis using by XRF and XRD shows that blue pigment consist of Azurite. And each specimens were evaluated particle size, chromaticity, specific gravity and oil-absorption according to rating system of pigments particle size. Results show that the value of L* increase with the decrease in particle size. The results suggest that the physical properties which is specific gravity, oil-absorption and chromaticity depend on the particle sizes of pigments. When it comes to particle size of pigments decreased by increasing the number of rating system. In addition, the chromaticity related to particle size. The result from this study expects to be used as useful referencing data for conservation and restoration of cultural heritage and understanding phenomena of the properties according to various particle size of Seokcheong pigment.

Full-pipelined CTR-AES를 이용한 Giga-bit 보안모듈 설계

박주현,김영철,김광옥,Park, Ju-Hyun,Kim, Young-Chul,Kim, Kwang-Ok 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.6

현재 가정과 소규모 사업장에서 재정적인 변화와 개인 커뮤니케이션 그리고 원격의료에 이르기까지 점점 GPON 사용이 일반화 되어가고 있다. 이러한 PON의 다중사용 때문에 개인정보 보호와 커뮤니케이션 보호를 위한 보안의 필요성이 더더욱 커지고 있다. 이를 위해 이 논문에서는 Virtex4 FPGA를 기반으로 AES의 카운터 모드를 구현하였다. 본 논문에서 구현된 구조는 pipeline 구조 구현을 위하여 크게 세 가지 특징을 가지고 있는데 1) composite filed 연산을 이용한 Subbyte, 2) efficient MixColumn transformation, 그리고 3) on-the-fly key scheduling이다. 구현된 S-box는 면적의 17% 감소와 on-the-fly key 스케줄링 기법으로 pipeline 구조에 특화된 key-expander 기능을 구현하였다. Nowdays, homes and small businesses rely more and more PON(Passive Optical Networks) for financial transactions, private communications and even telemedicine. Thus, encryption for these data transactions is very essential due to the multicast nature of the PON In this parer, we presented our implementation of a counter mode AES based on Virtex4 FPGA. Our design exploits three advanced features; 1) Composite field arithmetic SubByte, 2) efficient MixColumn transformation 3) and on-the-fly key-scheduling for fully pipelined architecture. By pipeling the composite field implementation of the S-box, the area cost is reduced to average 17 percent. By designing the on-the-fly key-scheduling, we implemented an efficient key-expander module which is specialized for a pipelined architecture.

Quality of Life in Korean Patients with Burning Mouth Syndrome

박주현,권정승,최종훈,안형준,Park, Ju-Hyun,Kwon, Jeong-Seung,Choi, Jong-Hoon,Ahn, Hyung-Joon Korean Academy of Orofacial Pain and Oral Medicine 2011 Journal of Oral Medicine and Pain Vol.36 No.2

The purpose of this study was to evaluate the individually perceived quality of life in Korean patients with BMS using two questionnaires : the Medical Outcome Short Form Health Survey Questionnaire (SF-36) and the Oral Health Impact Profile (OHIP-49). This cross-sectional study included sixty subjects diagnosed with BMS and sixty healthy subjects as controls. All subjects in this study completed two questionnaires: the Medical Outcome Short Form Health Survey Questionnaire (SF-36) and the Oral Health Impact Profile (OHIP-49), which had been translated into Korean and subsequently validated for use in Korea. All of the subscales in the SF-36 exhibited significantly lower scores in BMS patients than control groups. Comparison of the mean SF-36 scores between the two groups revealed the greatest differences to be for the subscales of physical pain and role emotional (role limitations due to emotional problems). The mean score on each subscale of the OHIP-49 was significantly higher in BMS patients than control groups. Comparison of the mean OHIP-49 scores between the two groups revealed the greatest difference to be for the subscale of physical pain. These findings demonstrated that BMS had an impact on various components of a patient's quality of life. BMS patients exhibited more impaired results and a poorer quality of life than control groups.

초등과학수업에서 마인드 맵 활용에 대한 탐색

박주현,문병찬,송진여,Park, Ju-Hyun,Moon, Byoung-Chan,Song, Jin-Yeo 대한지구과학교육학회 2009 대한지구과학교육학회지 Vol.2 No.1

The purpose of this study is to investigate the characteristics of the mind maps which were drawn with pencil or color pens by elementary students. For this study, 31 students of the 6th grade were selected and trained mind mapping. After training, the subjects had drawn mind maps with color pens about the ROCK for 15minutes and drew mind maps with pencil after 2days of mind mapping using color pens. In addition to activities of mind mapping, the students handed in their papers which were written one's impression of drawing two kinds of mind mapping. The results were follows: First, in central circle which was linked words connected firstly with ROCK as key word, the difference of 2kinds mind maps were little showed in the quantity and quality of the words, branches and their adequacy. Second, the mind maps using pencils had more words, branches and images than mind maps of using color pens in the whole assessment. Third, the most students suggested that the mind mapping using pencil were advantage to economy of time, retouching words and branches, also the mind mapping using pencil made the students relax the strain for drawing it because of retouching possibility. Consequently, the results of this study suggest the mind mapping using pencil has advantage effect on the purpose of gaining students' thinking abundantly and economy of time in elementary science classes.