발치 및 비발치 치료 전후 악궁 폭경의 변화

전지윤,김수정,강승구,박영국 대한치과교정학회 2007 대한치과교정학회지 Vol.37 No.1

일반적으로 네 개의 소구치 발치를 동반한 교정치료는 비발치 치료에 비하여 치열궁 폭경을 더 좁게 만들어, 미소 시 구각 부위에 어두운 구강 내 공간, 소위 buccal corridor를 형성함으로써 비심미적인 결과를 낳는다는 견해가 있다. 한편 발치 치료는 오히려 하악의 견치간 폭경을 증가시키며, 비발치 치료와 비교하여 악궁 폭경의 변화에 있어 유의한 차이를 보이지 않는다는 상반된 연구결과가 존재한다. 이 연구는 발치 치료와 비발치 치료 시 악궁 폭경의 변화를 관찰하여 실제적으로 발치 치료가 미소 시 협측 분절에 미치는 영향을 규명하고자 시행되었다. 경희대학교 치과병원 교정과에서 치료받은 환자 중 전악에 고정식 장치를 사용하여 네 개의 제1소구치 발치 치료를 받은 30명과 비발치로 치료한 30명의 치료 전후 연구 모형을 비교 분석한 결과 악궁 폭경의 변화는 다음과 같다. 네 개의 제1소구치 발치 치료 시 비발치 치료와 비교하여 상악의 견치간 폭경 변화는 유의한 차이가 없었으나, 하악의 견치간 폭경은 유의하게 더 많이 증가하였다. 구치간 폭경 변화는 상악과 하악 치열궁 모두에서 두 군 간에 유의한 차이가 나타났는데, 발치군에서 구치간 폭경이 감소한 반면에 비발치군에서는 구치간 폭경이 증가하였다. 미소 시 노출되는 악궁 폭경은 비발치군보다 발치군에서 더 크게 나타났으며, 이는 치열궁 폭경의 축소가 발치 치료 시 당연히 예상되는 결과가 아님을 시사한다. Objective: This study was performed to investigate the influences of extraction and nonextraction treatment on smile esthetics by measuring dental arch width changes. Methods: Pretreatment and posttreatment study models of 30 first premolar extraction cases and 30 nonextraction cases were randomly selected to determine whether extraction treatment results in narrow dental arches, and a consequent unaesthetic smile. Arch widths were measured from the cusp tips of the canines and the first molars. Posterior arch widths were also measured at a constant arch depth derived by averaging randomly chosen nonextraction models. Results: The intercanine widths increased significantly in the extraction sample, whereas the intermolar widths decreased significantly. The arch width at a standardized arch depth was significantly wider in the extraction subjects. Conclusion: These results elucidate that constriction in arch width is not a materialized consequence of extraction treatment. It leads to postulate that an esthetically compromising effect from narrow dental arches on smile is hardly anticipated with extraction treatment.

DSP칩을 이용한 고속 스펙트럼 분석 장치개발에 관한 연구

전희종,정을기,윤지용,문학룡 崇實大學校 生産技術硏究所 1993 論文集 Vol.23 No.-

Signal analysis in frequency domain attracts many electrical engineers in sense that a viewpoint of the problem is puted to other direction. So, spectrum analyzer has become essential equipment as a measurement device. Because the FFT theory which becomes base of the digital spectrum analyzer, has to process many calculation, the real time processing is very difficult, and so the engineers of this field has continued to research reduction of calculation or fast processing in the FFT operation. In this paper, DSP(Digital Signal Processor) chip by development of novel semiconductor technology applys in general FFT theory, and is processed in real time. For these, this paper proposed an algorithm of the software and a configuration of hardware. In conclusion, this proved that 128 point FFT operation was able to process in real time(4,257ms).

대학생이 인지하는 영어격차 현상 : 사례연구

정지윤,전지현 이화여자대학교 사범대학 교과교육연구소 2013 교과교육학연구 Vol.17 No.1

영어격차는 전통적인 소득의 불균형, 정보격차와 더불어 글로벌 사회에서 기회의 격차를 야기하는 중요한 사회현상이 되고 있다. 초·중·고를 거치며 영어격차는 대학에서 더욱 심화되어 나타나며, 영어격차는 대학생들의 자신감 상실, 스트레스 증가, 자기효능감 저하 등의 부정적인 영향을 초래하기도 한다. 영어격차에 대한 우려, 또 격차해소를 위한 정책적인 노력은 이어지고 있으나 막상 영어격차 현상이 학교 현장에서 어떻게 나타나고 있는 지, 학습자들은 영어격차를 어떻게 받아들이고 있는 지에 대한 구체적인 자료는 찾아보기 힘들다. 영어격차에 대한 학습자의 인식은 어떠한 지 연구가 필요하다. 본 연구는 대학생들이 인식하고 있는 영어격차에 대하여 이해하고 해결방안을 제시하기 위하여 수행되었다. 서울소재 B대학의 한 학과 학생 45명을 대상으로 심층인터뷰를 실시하여 (1) 학생들이 어떤 경우에 영어격차를 경험하며 그 원인이 무엇이라고 생각하는 지 (2) 영어격차를 느낄 때 학생들은 어떠한 반응을 보이게 되는 지 (3) 영어격차가 학생들의 현재와 미래의 생활에 어떠한 영향을 준다고 생각하는 지 탐색하여 보았다. 인터뷰는 응답자 1인당 25-30분 간 이루어졌으며 모든 인터뷰는 학생의 동의하에 녹음되었고, 녹음된 인터뷰는 전사하여 분석하였다. 인터뷰를 전사한 파일을 Nvivo 2.0을 활용하여 연구자가 여러 번 읽으며 코드를 생성하고 수정하고 통합하는 과정을 통하여 응답내용을 분류할 수 있었다. 연구결과는 영어격차에 대한 학생들의 인식을 한 눈에 볼 수 있도록 도식화하여 제시되었으며 학생, 교수, 또 학교 차원에서 영어격차를 해소할 수 있는 방안과 함께 논의된다. The English divide and the digital divide are new forms of social inequalities in Korea, added to the traditional inequalities of income and wealth. These new forms of social inequalities are believed to be affecting the opportunities of people in our global society. The English divide, in particular, often reveals significant problems due to its negative influences, such as the loss of confidence, increase in stress, and decrease of self-efficacy of college students. Despite these negative effects, few studies on the English divide have been conducted. The present study was conducted to understand the English divide felt by college students and to provide effective solutions to reduce the divide. An interview study was designed to (1) identify when and how college students experience the English divide; (2) identify the effects of the English divide on students' college lives and their lives after graduating from college; and (3) identify possible ways to narrow the gap. Forty-five students enrolled in a business major at B university, with varying overseas experiences and years of college study, were interviewed. Each interview was audio-recorded, transcribed, and analyzed using the Nvivo 2.0. The results are presented with suggestions.

브라켓과 탄선 간의 마찰 전후 표면 변화 분석 : 원자현미경을 이용한 예비연구

이태희,박기호,전지윤,김수정,박헌국,박영국 대한치과교정학회 2010 대한치과교정학회지 Vol.40 No.3

브라켓과 호선 간에 발생하는 마찰은 치아 이동의 효율에 상당한 영향을 미친다. 마찰력에 기여하는 요소 중 특히 브라켓과 호선의 표면조도는 중요한 요소이다. 본 연구는 브라켓과 탄선을 실험적으로 마찰시킨 후, 원자현미경 (atomic force microscope, AFM)을 사용하여 브라켓 슬롯과 교정용 탄선의 표면 조도 변화를 정성적, 정량적으로 측정하고 비교 평가하여 브라켓과 호선 간의 마찰이 각각의 표면 변화에 미치는 영향을 규명하고자 시행되었다. 스테인리스 스틸 브라켓과 세라믹 브라켓에 각각 스테인리스 스틸 탄선과 TMA 탄선을 실험적으로 활주마찰시킨 후 각각을 원자현미경을 이용하여 표면을 관찰하였다. 실험결과 브라켓보다는 교정용 탄선에서 활주마찰 후에 더 많은 표면 변화가 나타났다. 또한 활주마찰 후에 스테인리스 스틸 브라켓은 표면 조도의 유의한 변화가 없었으나 세라믹 브라켓은 표면 조도가 감소하였다. 그리고 교정용 탄선은 모두 활주마찰 후에 표면 조도가 증가하였으며 이러한 표면 변화는 스테인리스 스틸 브라켓보다 세라믹 브라켓과의 활주마찰 후에 더 큰 것으로 관찰되었다. 본 실험으로 원자현미경은 브라켓 슬롯과 탄선의 표면 조도를 정량적으로 측정하는 데에 유용한 수단임을 알 수 있었다. Objective: The surface roughness of orthodontic materials is an essential factor that determines the coefficient of friction and the effectiveness of tooth movement. The aim of this study is to evaluate the surface roughness change of the brackets and wires after experimental sliding quantitatively. Methods: Before and after experimental sliding tests, the surface roughness of stainless steel brackets, ceramic brackets, stainless steel wires, and beta-titanium (TMA) wires were investigated and compared using atomic force microscopy (AFM). Results: After sliding tests, changes in the surface of the wire were greater than changes in the bracket slot surface. The surface roughness of the stainless steel bracket was not significantly increased after sliding test, whereas the roughness of ceramic brackets was decreased. Both the surface roughness of stainless steel and TMA wires were increased after sliding test. More changes were observed on the ceramic bracket than the stainless steel bracket. Conclusions: AFM is a valuable research tool when analyzing the surface roughness of the brackets and wires quantitatively.

The LC-MS/MS Based Multi-omics Analysis to Investigate Clostridioides difficile Infection Using in vitro Coculture Device, The Mimetic Intestinal Host-Microbe Interaction Coculture System, MIMICS

Ji-eun KWON,Sung-Huyn JO,Jae-Seung LEE,Hyo-Jin JEON,Ji-Hyeon PARK,Ye-Rim KIM,Min-Gyu KIM,Ji-Hyun BAEK,Yun-Gon KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10

Clostridioides difficile is a gram-positive bacterium and is considered as an enteric pathogen. C. difficile colonizes the host with intestinal dysbiosis and produces virulence factors, Toxin A and B. Although the cytotoxicity of C. difficile has been well elucidated, the exact pathogenic mechanisms and biological pathways of C. difficile infection (CDI) are not yet clear. Here, we developed a CDI model using MIMICS to investigate C. difficile-host interactions throughout the early (12 hr) and later (48 hr) stages of infection. We also apply an LC-MS/MS-based multi-omics approach to study the physiological changes in CDI-induced gut epithelial cells at the molecular and cellular levels. The proteomic analysis confirmed that proteins involved in cellular responses such as stress, immune responses and DNA damage responses are upregulated at early stages of infection. In addition, a representative CDI phenotype has been identified in the late stage of the infection. Our in vitro CDI model and multi-omics approach not only provide a better understanding of host-anaerobic pathogen interactions but may also aid in the treatment of C. difficile and other anaerobic infections.

Citizen Participation in Science & Technology, Communication, and Education in the Age of Great Transformation

Ji Yeon Kim,Yun Jae Kang,Moon-hwan Kim,Ji-hyun Jeon,Seong Hee Kim,Gyu Tae Kim 한국언론학회 2020 Asian Communication Research Vol.17 No.3

This special report consists of four research-in-brief analyses based on the “Scientific Culture and Media Use of the 4<SUP>th</SUP> Industrial Revolution” survey. In the first analysis, Kim deals with the issue of citizen participation in science and technological changes. Her research suggests a positive relationship between technological change and citizen participation in science and technology. Secondly, Kang raises important arguments regarding various transforming democratic principles that are centered on smart cities. His research explores the digital platforms of engaging citizens in smart cities and discusses these changes in governing policy regarding smart cities. With an information processing perspective, Kim and Jeon analyze the public perception of the 4<SUP>th</SUP> Industrial Revolution. They found that Koreans adopt various innovative media strategies of data sharing and accumulation, which have a positive relationship with the acquisition of new scientific and technological knowledge. At the closing, S. Kim and G. Kim analyze the problem of smart education and suggest learning space innovation. They discuss how important implementing smart education is within our school system.

LC-MS/MS Based Multi-omics Approaches for Prebiotic Inulin Utilization on Faecalibacterium prausnitzii

Ji-Hyeon PARK,Sung-Hyun JO,Jae-Seung LEE,Hyo-Jin JEON,Ji-Eun KWON,Ye-Rim KIM,Ji-Hyun BAEK,Min-Gyu KIM,Yun-Gon KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10

The human gut commensal bacteria Faecalibacterium prausnitzii is well known for its anti-inflammatory effects that improve host intestinal health. Although several studies reported that inulin, one of the well-known prebiotics, increases the abundance of F. prausnitzii in the intestine, the mechanism under this effect of inulin remains unclear. Here, we applied LC-MS/MS-based multi-omics approaches to confirm the effects of inulin on F. prausnitzii. Interestingly, the proteomic analysis revealed that the putative proteins involved in sucrose utilization of F. prausnitzii are upregulated in the presence of inulin. To investigate the function of the proteins, we cloned the target genes, and observed the ability for sucrose degradation. In addition, we demonstrated that the sucrose degradation activity in F. prausnitzii culture media is enhanced by using inulin as a carbon source compared to glucose. Taken together, this study suggests that the reduction of sucrose induced by inulin could potentially improve host health and prevent gut dysbiosis like type 2 diabetes which is associated with sucrose.

Amounts of Oral Microorganism according to Use of the Interdental Brush with Cethyl Pyridium Chloride Solution

Ji-Sook Jeon,Byeng-Ken Cho,Yun-Hwa Choi,Ji-Hyeon Park 대한예방치과학회 2015 International Journal of Clinical Preventive Denti Vol.11 No.2

Objective: Interdental brush can be used at proximal area of the interdental space and prosthodontic or orthodontic appliance where is hard to access by use of normal toothbrush. It is well known that lots of oral microorganism would be inside of gingival pocket at the proximal area and it should be eliminated with clean way. Methods: The author has measured the amounts of the oral microorganism at proximal area by use of adenosine triphosphate unit (SURE PlusTM) for 50 adults volunteers, after using the interdental brush and after sterilization with cethyl pyridium chloride (CPC) solution, through inserting the tip of the interdental brush into the CPC solution for a minute with shaking it. Amounts of oral microorganism at proximal area were measured as relative light units (RLU) unit and gingival index with Löe and Silness index and gingival pocket depth were measured, in order to find the relation between the amounts of oral microorganism and their Value, by use of Pearson’s co-relation coefficient. Results: The results were as followings: 1. Oral microorganism at the tip of interdental brush afterusing at the proximal area was checked as average 9,492.9±407.2 RLU and a little decreased value as 8,959.8±485.4 RLU on proximal area after applying of CPC solution (p<0.01). Otherwise the least value was revealed as 4,766.8±2,829.7 RLU after applying the used tip of interdental brush at the proximal area, by inserting into the CPC solution and shaking for a minute (p<0.01). 2. Average 9,475.6±368.2 RLU at proximal area was revealed before mouth rinsing with CPC solution, buta little bit decreased as 8,792.9±620.1 RLU, after a minute mouth rinsing with CPC solution (p<0.01). Conclusion: Based on the results, we concluded that disinfection and cleaning method by inserting the interdental brush tip in CPC solution and shaking for a minute, is clinically recommended to keep the tip clean after use at the proximal area.

비대칭적 입식자세에서 상지 조립 작업 시 체간 및 둔부 근육의 좌우 근활성도 비교

정지윤(Ji Yun Choung),전혜선(Hye Seon Jeon),이충휘(Chung Hwi Lee),이정원(Jeon Won Lee) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.3

The purpose of this study was to compare the electromyographic(EMG) activities of trunk and hip muscles between right and left sides while subjects performed prolonged manual task in asymmetric and symmetric weight-bearing posture. Fifteen healthy male college students were recruited for this study. The subjects were asked to perform bimanual upper extremity task for 6 minutes in two different standing postures. In the symmetric weight-bearing posture, the subjects were standing with evenly distributed body weights to both legs. In the asymmetric weight-bearing posture, the subjects distributed about 90% of their body weight onto their preferred(supporting) leg and 10% of their body weight onto the opposite leg while they were standing. EMG activities of the right and left internal oblique, erector spinae, gluteus maximus, and gluteus medius were measured and normalized as % MVIC. Then the EMG data were statistically analyzed using paired t-tests. The EMG activities of all measured muscles were not significantly different between the right and left side in the symmetrical weight-bearing posture(p>0.05). However, the EMG of the supporting side internal oblique was significantly lower than the opposite side(p<0.05), and the EMG of the erector spinae, gluteus maximus, and gluteus medius were significantly greater on the supporting side(p<0.05). The results of this study support that unbalanced use of right and left muscle possibly causes the changes in muscle length which results in asymmetry of trunk and hip muscles. Furthermore, the uneven weight support onto right and left legs will cause a distortion of viscoelastic ligaments around hip and sacroiliac joints in the long run. Further studies to determine the effect of various manual tasks on the trunk and hip muscles as well as the effect of asymmetrical weight-bearing standing posture on hip and back muscle fatigue may be required.

‘전문(全文) 읽기’를 통한 「흥부전」 가르치기

박희영(Park Hee young),전윤갑(Jeon Yun gap),황지영(Hwang Ji young) 우리말교육현장학회 2017 우리말교육현장연구 Vol.11 No.2

문학교육의 목표는 학생들로 하여금 ‘문학 능력’을 키우게 하는 데에 있다. 그런데 학교에서는 교과서 쪽수의 한계와 수업 시수 부족을 이유로, 작품의 일부분만을 학생들에게 제시하고, 그 작품에 대한 문학지식을 명제적·개념적으로 전달하는 것이 문학 교육의 전부인 양 여겨져 왔다. 이 연구는 교실 수업에서 「흥부전」을 대상으로 ‘전문(全文) 읽기’와 토론을 함으로써, 학생 스스로 문학을 수용하고 생산하는 활동의 가능성을 타진해 보았다. 먼저, 「흥부전」을 다룬 동화와 청소년용 출판물, 영상물, 교과서를 검토하였다. 「흥부전」을 담고 있는 대부분의 매체들이 「흥부전」 원전의 속살을 제대로 담고 있지 못했다. 또한 「흥부전」에 대한 학생들의 인식과 흥미가 전문 읽기를 하기 전과 후에 어떻게 다른지 살펴보았다. 학생들이 전문을 읽기 전에는 인물이나 주제, 줄거리가 뻔하다는, 그래서 「흥부전」은 재미없다는 생각을 가지고 있었다. 그러나 전문 읽기를 하는 과정에서 인물과 사건에 대한 살아 있는 묘사, 입말체 문장, 시대에 대한 풍자를 제대로 만나게 되었고, 작품을 온전히 이해하고 즐기게 되었다. 전문 읽기 뒤에 한 토론 과정에서는 작품의 시대적·사회적 맥락을 탐구하고 이해하였다. 이 연구는 입시 위주 교육 현장에서 시간 부족 따위를 이유로 외면 받아온, 문학작품 ‘전문 읽기’가 현실적으로 가능함을 밝혔다. 또한 현실의 어려움을 넘어서기 위한 동기 부여로서 ‘전문 읽기’가 학생들에게 끼친 영향을 공유하고자 진행되었다. Literature education aims to enable students to develop ‘literacy skills’. However, schools present only some of works to students because of limitation of the number of pages in textbooks and shortages of teaching hours, and they have seen conceptual and propositional deliveries of literary knowledge on works as the whole of literary education. This study investigated possibilities for students to engage in activities to accept and produce literature on their own through ‘reading the full text(全文)’ of 「Heungbu-jeon」 and discussion in a classroom instruction. Firstly, fairy tales, publications, videos, and textbooks for youths on 「Heungbu-jeon」 were reviewed. However, it was found that most of the media dealing with 「Heungbu-jeon」 did not fully contain the reality of the original text of 「Heungbu-jeon」. Then, students’ perceptions of 「Heungbu-jeon」 and how their interests differ before and after reading its full text were investigated. Before reading the full text, the students thought that it is not funny because characters, a theme, and plot are too obvious. However, they were able to get to know the characters, vivid descriptions of events, sentence patterns of colloquial style, and satire of the time during reading the full text so that they could fully understand and enjoy the work. Moreover, students explored and understood the time and social context of the work during the discussion after reading the full text. This study shows that it is possible to practically read the full text of literature, which has been ignored for shortages of time in fields of education focusing only on university entrance exams. In addition, this study is intended to share effects of ‘reading the full text’ on students, as a motivation to overcome difficulties of the reality.