Correlation between skeletal and dental changes after mandibular setback surgery-first orthodontic treatment

Chang-Hoon Rhee,Youn-Kyung Choi,Yong-Il Kim,Seong-Sik Kim,Soo-Byung Park,Woo-Sung Son 대한치과교정학회 2015 대한치과교정학회지 Vol.45 No.2

Objective: To investigate skeletal and dental changes after application of a mandibular setback surgery-first orthodontic treatment approach in cases of skeletal Class III malocclusion. Methods: A retrospective study of 34 patients (23 men, 11 women; mean age, 26.2 ± 6.6 years) with skeletal Class III deformities, who underwent surgery-first orthodontic treatment, was conducted. Skeletal landmarks in the maxilla and mandible at three time points, pre-treatment (T0), immediate-postoperative (T1), and post-treatment (T2), were analyzed using cone-beam computed tomography (CBCT)-generated half-cephalograms. Results: The significant T0 to T1 mandibular changes occurred ?9.24 ± 3.97 mm horizontally. From T1 to T2, the mandible tended to move forward 1.22 ± 2.02 mm, while the condylar position (Cd to Po-perpendicular plane) shifted backward, and the coronoid process (Cp to FH plane) moved vertically. Between T1 and T2, the vertical dimension changed significantly (p < 0.05). Changes in the vertical dimension were significantly correlated to T1 to T2 changes in the Cd to Po-perpendicular plane (r = ?0.671, p = 0.034), and in the Cp to FH plane (r = 0.733, p = 0.016), as well as to T0 to T1 changes in the Cp to Poperpendicular plane (r = 0.758, p = 0.011). Conclusions: Greater alterations in the vertical dimension caused larger post-treatment (T2) stage skeletal changes. Studying the mandibular position in relation to the post-surgical vertical dimension emphasized the integral importance of vertical dimension control and proximal segment management to the success of surgery-first orthodontic treatment.

Long second toe: its nail and skin changes

( Geun-hwi Park ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Tae-wook Kim ),( Sung-min Park ),( Hyun-joo Lee ),( Gun-wook Kim ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Moon-bum 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2

Background: Nail can be affected by trauma, infection, and systematic disorders. In particular, the toe nails are exposed to the repeated and cumulative minor traumas, which usually result in thickened, splitted, and discolorated nails. Considering these, it can be inferred that the long second toe can be related to various nail and skin changes by repeated minor traumas such as friction in shoes, but the study or report on this topic hasn’t been done yet. Objectives: The purpose of this study was to introduce various nail and skin changes on long second toe. Methods: We analyzed the kinds of nail/skin changes of 50 patients with long second toe, enrolled at Pusan National University Hospitals (Busan and Yangsan) from 2013 to 2018. Results: There was no significant difference in the incidence of left and right toe and toenail, and 7 (14%) patients presented bilateral distribution. The most common nail change on long second toe was melanonychia (23, 46%), followed by subungual hematoma (15, 30%), onycholysis (2, 4%), subungual hyperkeratosis (2, 4%), onychomadesis (1, 2%), and retronychia (1, 2%). The most common skin change was corn (9, 18%), followed by paronychia (2, 4%). Twenty (20/50, 40%) patients also had other toe or toenail changes. Among them, the most common site was big toe/nail (13, 62%), and the most common change was subungual hematoma (8, 42%). Conclusion: Through this study, the dermatologists can recognize and diagnose the nail and skin changes of long second toe.

A proposal of the Optimal Angle of Standing Assistant Chair for the Elderly by Comparing of Pressure Distribution on Hip

Sung-Ho Chang(장성호),Ji-Hoon Baek(백지훈),Jung-Eon Lee(이중언),Nematov Mirazamjon(Nematov Mirazamjon),Seok-Wan-Kang(강석완),Wang-Bum Lee(이왕범) 한국산업경영시스템학회 2018 한국산업경영시스템학회지 Vol.41 No.3

One of the most performed action in daily life is standing up from sitting position. As the population of the world is aging at the high rates, people may face problems with reduced muscle strength as well as psychological changes. This can lead elderly people having difficulties with standing up from chair. Now, with the aging trend worldwide, products are being developed that can support the lives of the elderly. This study examines the distribution of hip pressure in relation to the seating positions of the standing assistance seats under development to prevent standing up accidents in older adults. The currently developing standing assistant chair designed to tilt to a maximum angle of 25 degrees. At over 25°, design considers that older people are at risk of thrown back out of that force and that the forces exerted on their arms and legs can be a significant burden to older people. By considering danger of higher than 25° for older people which is experimented in the basis of static capturing approach in previous papers, it is experimented people with age group of 20~60 on 0° to 25° tilting angle on the basis of dynamic capturing method in order to pick convenient angle of inclination. Moreover, tried to find the optimum angle by comparing the hip pressure distribution when seated at the edge of the seat and at the center of the seat with the pressure distribution sensor.

Investigation of channel mobility in AlGaN/GaN high-electron-mobility transistors

Chang, Sung-Jae,Kang, Hee-Sung,Lee, Jae-Hoon,Yang, Jie,Bhuiyan, Maruf,Jo, Young-Woo,Cui, Sharon,Lee, Jung-Hee,Ma, Tso-Ping Institute of Pure and Applied Physics 2016 Japanese Journal of Applied Physics Vol.55 No.4

<P>We have investigated the channel mobility in the gated region of a set of high-quality AlGaN/GaN high-electron-mobility transistors (HEMTs). The resistances in the contact, access, and gated regions were extracted from straightforward I-D(V-G) measurements on sets of HEMTs with four different gate-to-drain distances. By correcting for the effects of the contact and access resistances, much more accurate effective mobility curves in the gated region, compared to those reported in the past, have been obtained. The maximum effective mobility in that region has been found to be 1100cm(2)V(-1) s(-1) at carrier density n(s) = 7 x 10(12)cm(-2) at room temperature. We have extracted the mobility curves in a wide range of temperatures (80 to 520 K) and carrier concentrations (up to 1.3 x 10(13)cm(-2)). Our systematic measurements have revealed various dominant scattering mechanisms as the temperature and carrier concentration change. (C) 2016 The Japan Society of Applied Physics</P>

A Comparative Proteomics Survey of Proteins Responsive to Phosphorous Starvation in Roots of Hydroponically-grown Rice Seedlings

( Sang Gon Kim ),( Yi Ming Wang ),( Chang Hoon Lee ),( Bong Gyu Mun ),( Pil Joo Kim ),( Sang Yeol Lee ),( Yong Chul Kim ),( Kyu Young Kang ),( Randeep Rakwal ),( Ganesh Kumar Agrawal ),( Sun Tae Kim ) 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.5

Rice takes up phosphorous (P) as major nutrient source for its growth and development when grown under anaerobic water-logged soil conditions. To better understand the underlying mechanisms and to develop potential protein biomarkers of P-starvation, hydroponically-grown rice seedlings in the complete media and phosphorus absence (P-starvation) of phosphorous nutrient solutions were investigated for physiological and proteome changes. The P-starvation manifested significant reduction in root growth in three-week-old seedlings compared to respective complete media. Furthermore, P-starvation also showed increased activity of acid phosphatase in roots of one- and three-week-old seedlings, suggesting that experimental design is suitable for proteomics survey of P-starvation responsive proteins. Two-dimensional gel electrophoresis coupled with matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry analysis of total root protein from three-week-old seedlings identified 10 P-starvation responsive protein spots out of 140 high-quality protein spots. Identified 10 proteins were involved in metabolism and defense/stress response. Out of 10, 2 and 8 protein spots were found to be up and down-regulated, respectively. Semi-quantitative reverse transcription polymerase chain reaction (RT-PCR) analysis of corresponding genes of four randomly selected proteins, including putative glyceraldehydes-3-phophate dehydrogenase (G3PDH, spot R1), S-adenosyl-L-methionine synthetase (SAMS, spot R4), ATP synthase subunit alpha (spot R6), and root-specific pathogenesisrelated protein 10 (PR-10, spot R8), showed that just as protein abundance, these proteins are also regulated at the transcript level. Results suggest identified P-starvation responsive proteins are involved in maintaining nutrient homeostasis and/or associated with changes in root physiology under the absence of P.

Salt and pepper appearance of the skin associated with mixed connective tissue disease

( Sang-hyeon Won ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Tae-wook Kim ),( Sung-min Park ),( Hyun-joo Lee ),( Gun-wook Kim ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Moon-bum 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1

The salt-and-pepper appearance of skin is composed of salt (vitiligo-like depigmentation) and pepper(perifollicular pigmentation). This characteristic feature can be a clinical clue for the diagnosis of systemic sclerosis. Mixed connective tissue disease(MCTD) is a distinct disease entity with mixed features of systemic lupus erythematosus, systemic sclerosis, myositis and rheumatoid arthritis with high titers of antibodies to U1 small nuclear ribonucleoprotein(U1 snRNP). Therefore, MCTD is known to have a wide spectrum of cutaneous manifestations which may be the presenting signs of the disease. However, there are few reports of pigmentary changes in MCTD. A 51-year old woman presented with variably sized hypopigmented macules along with relative hyperpigmentation of the perifollicular areas. She was diagnosed with MCTD by Raynaud’s phenomenon and high titer anti-RNP corresponding to a speckled antinuclear antibody of 1:1280 in Rheumatology clinic. A biopsy specimen showed dermal sclerosis. Pigment loss and melanophages were observed in the papillary dermis. Hypo- and hyperpigmentation were confirmed histologically by S100 and Fontana-Masson stain. To our knowledge, ‘salt and pepper appearance of the skin’ has rarely been reported in MCTD. The diagnosis of MCTD can be challenging due to its diverse characteristics. Therefore, we suggest that MCTD should be regarded as a differential diagnosis in patient with this pigmentary change.

Underlying representation in geminates: from OT perspective

Sung-Hoon Hong,Chang-Kook Suh 한국음운론학회 2004 음성·음운·형태론 연구 Vol.10 No.1

Hong, Sung-Hoon, and Chang-Kook Suh. 2004. Underlying represen-tation in Geminates: from an OT perspective. Studies in Phonetics, Phonology and Morphology. 10.1. 129.144. This research has examined the status of Underlying Representation (UR) in Optimality Theory focusing on the representation of consonant geminates. For this purpose, we have examined geminate/singleton alternation in Ponapean employing Lexicon Optimization (LO), an algorithm proposed to select a UR among multiple inputs. We have seen that simple application of LO is problematic in singling out a UR for the case of alternation. This leads us to the version of LO that is performed on the paradigms, rather than on an individual forms (Tesar and Smolensky 1996, 2000, Inkelas 1995, 1998). After a thorough implementation of LO, we have found that the URs are simply identical to the input forms; geminate UR for the alternating case and singleton UR for the nonalternating case. Further, it was shown that a unique underlying representation of geminates, regardless of their positions in which they occur, can account for the exceptional geminate behaviors. (Hansung University and Cheonan University)

자동차 칵핏 모듈용 플라스틱 소재의 열화 동특성 평가

우창수(Chang Su Woo),박현성(Hyun Sung Park),조진호(Jin Ho Jo),김지훈(Ji Hoon Kim),최주호(Ju Ho Choi),김영국(Yeoung Kuk Kim) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.12

플라스틱 소재는 온도, 습도 및 자외선 등 다양한 환경의 영향으로 인해 기계적 물성변화가 심하기 때문에 체결부의 견고함이 느슨해지고 형태의 변형에 의해 부품간의 마찰 등을 유발하여 잡음이 발생하게 된다. 따라서, 본 논문에서는 자동차 칵핏 모듈에 사용되는 다양한 플라스틱 소재에 대해 온도변화에 따른 동 특성시험을 통해 유리전이온도, 저장탄성계수, 손실계수 등을 측정하여 상온 및 열화조건에 따른 물성변화를 파악하였다. 시험결과, 온도가 높을수록 저장탄성계수는 감소하고 손실계수는 증가하는 경향을 나타내었다. Engineering plastics are used in instrument panels, interior trim, and other vehicle applications, and the thermomechanical behaviors of plastic materials are strongly influenced by many environmental factors such as temperature, sunlight, and rain. As the material properties change, the mechanical parts create unexpected noise. In this study, the dynamic mechanical property changes of plastics used in automobiles are measured to investigate the temperature effects. Viscoelastic properties such as the glass transition temperature and storage modulus and loss factor under temperature and frequency sweeps were measured. The data were compared with the original ones before aging to analyze the behavior changes. It was found that as the temperature increased, the storage modulus decreased and the loss factor increased slightly.

Development of vitrification protocol in Rubia akane (nakai) hairy roots using a systematic approach.

Park, Sang-Un,Kong, Hyunjung,Shin, Dong-Jin,Bae, Chang-Hwan,Lee, Sheong-Chun,Bae, Chang-Hyu,Rha, Eui-Shik,Kim, Haeng-Hoon Royal Veterinary College 2014 Cryo letters Vol.35 No.2

<P>A solution-based vitrification protocol is a process of sequentially changing-solutions from which both influx of cryoprotectants (loading) and efflux of water (dehydration) were accomplished before cryo-exposure. Hence, we need to properly control the concentration /composition of the cryoprotectant solutions.</P>

A Comparative Proteomics Survey of Proteins Responsive to Phosphorous Starvation in Roots of Hydroponically-grown Rice Seedlings

Kim, Sang-Gon,Wang, Yiming,Lee, Chang-Hoon,Mun, Bong-Gyu,Kim, Pil-Joo,Lee, Sang-Yeol,Kim, Yong-Chul,Kang, Kyu-Young,Rakwal, Randeep,Agrawal, Ganesh Kumar,Kim, Sun-Tae The Korean Society for Applied Biological Chemistr 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.5

Rice takes up phosphorous (P) as major nutrient source for its growth and development when grown under anaerobic water-logged soil conditions. To better understand the underlying mechanisms and to develop potential protein biomarkers of P-starvation, hydroponically-grown rice seedlings in the complete media and phosphorus absence (P-starvation) of phosphorous nutrient solutions were investigated for physiological and proteome changes. The P-starvation manifested significant reduction in root growth in three-week-old seedlings compared to respective complete media. Furthermore, P-starvation also showed increased activity of acid phosphatase in roots of one- and three-week-old seedlings, suggesting that experimental design is suitable for proteomics survey of P-starvation responsive proteins. Two-dimensional gel electrophoresis coupled with matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry analysis of total root protein from three-week-old seedlings identified 10 P-starvation responsive protein spots out of 140 high-quality protein spots. Identified 10 proteins were involved in metabolism and defense/stress response. Out of 10, 2 and 8 protein spots were found to be up- and down-regulated, respectively. Semi-quantitative reverse transcription polymerase chain reaction (RT-PCR) analysis of corresponding genes of four randomly selected proteins, including putative glyceraldehydes-3-phophate dehydrogenase (G3PDH, spot R1), S-adenosyl-L-methionine synthetase (SAMS, spot R4), ATP synthase subunit alpha (spot R6), and root-specific pathogenesis-related protein 10 (PR-10, spot R8), showed that just as protein abundance, these proteins are also regulated at the transcript level. Results suggest identified P-starvation responsive proteins are involved in maintaining nutrient homeostasis and/or associated with changes in root physiology under the absence of P.