• Maxillofacial Plastic and Reconstructive Surgery
• /
• v.30 no.5
• /
• pp.480-488
• /
• 2008

Orthodontists often treat cases which are difficult to treat with conventional orthodontics. In such cases, it could be treated with surgical procedures with the help of an oral surgeon. Especially, transverse deficiency of the mandible can be corrected by widening the transverse width of mandibular symphysis, using distraction osteogenesis. Transverse widening of mandibular sympysis is known as a safe treatment but still complications could occur during the treatment. We are reporting some complications of cases that mandibular symphysis transverse widening were applied. Some cases showed complications because of the inappropriate osteotomy line. Since straight vertical osteotomy line was inclined to the left, only the left bony segment was likely to expand. According to bio-mechanical considerations, it will be better to perform a step osteotomy, cutting the eccentric area of the alveolar crest and the centric area of the basal symphyseal area. Complications could also occur by the failure of the distraction device. The tooth borne distraction device was attached on the lingual side of the tooth with composite resin. During the distraction period, it was impossible to obtain appropriate distraction speed and rhythm because of frequent fall off of the distraction device. Therefore, distraction device should be attached firmly with orthodontic band or bone screw, etc. Tooth mobility increasement could also occur as a complication. 'Walking teeth phenomenon' was observed during the distraction period, showing severe teeth mobility and pain during mastication. These symptoms fade out during the consolidation period. Since the patient could feel insecure and uncomfortable, it should be notified to the patient before the procedure. Finally, alveolar crestal bone loss could occur. Alveolar crestal bone loss occurred because of lack of distraction device firmness and teeth trauma caused by lower lip biting habit. Therefore, adequate firmness of the distraction device and habit control will be needed.

• Korean Journal of Child Studies
• /
• v.3
• /
• pp.97-113
• /
• 1982

Problems This study was aimed to find out the effects of Kindergarten education on primary school child's learning achievement and it's continuance. The specific question to be investigated in this study can he summarized as follows. 1. How did the kindergarten education effect upon primary school child's learning achievement and behavioral development? 2. How did the differences of learning achievement and behavioral development between groups of children attending kindergarten and not attending kindergarten? Methods 1. Subjects One hundred and twenty children of sixth grade and one hundred primary school's teachers were employed 1) Sixty of children were experimented groups who had received kindergarten education. Sixty of Children are Control group who had not received Kindergarten education. The subjects were sampled in N primary school in seoul and Y primary school in Taejeon. Sixty of children were boys and sixty of children were girls. 2) Fifty of teachers were sampled in N primary school in Seoul and Fifty of teachers were sampled in Y primary school in Taejeon. 2. Instrument 1) School cumulative record. School cumulative record was referred to find out the differences of school records on learning achievement in morality, National language, social studies, arithmatics, natural science, gymnastics, music, fine arts and behavioral development in industry, responsibility, coorperation, indeperdence, law abiding spirit between experimental group and control group. 2) Questionnaire paper which constructed 10 articles. Questionnaire paper asked to primary school teachers for effects of kindergarten education. Results The results of date analysis can summarized as follows. 1. Kindergarten education, generally, is regarded effective at least for school work achievement but not so effective for morality and physical education. 2. Kindergarten education is not so effective in all school works of primary school in its continuance since its effectiveness begins to fade away from the 4th grade of primary school. But such continuance tends to be outstanding especially in national language, social subjects and arts. 3. The experiences of kindergarten education is not much helpful to behavioral development during primary school. 4. Primary school teachers recognize that kindergarten education contributes to curriculum work and behavioral development for primary school children.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.24 no.8B
• /
• pp.1577-1585
• /
• 1999

In this paper, we propose detection methods for gradual scene changes such as dissolve, pan, and zoom. The proposal method to detect a dissolve region uses scene features based on spatial statistics of the image. The spatial statistics to define shot boundaries are derived from squared means within each local area. We also propose a method of the camera motion detection using four representative motion vectors in the background. Representative motion vectors are derived from macroblock motion vectors which are directly extracted from MPEG streams. To reduce the implementation time, we use DC sequences rather than fully decoded MPEG video. In addition, to detect the gradual scene change region precisely, we use all types of the MPEG frames(I, P, B frame). Simulation results show that the proposed detection methods perform better than existing methods.

• Journal of the Korea Fashion and Costume Design Association
• /
• v.6 no.3
• /
• pp.45-53
• /
• 2004

Natural dyes have poor colorfastness as a result of the exposure of the dyed fabric to sunlight encountered during the display or wearing. As colors on fabrics fade excessively under sunlight, it is a problem to infer and restore the historic textiles with natural-dyed fabrics to original colors. The object of this study is to analyse the factors affected to color change under light. In experimental, fifteen natural dyes were dyed by the Korean traditional dyeing methods onto natural fiber fabrics: cotton, silk, ramie, and flex. Total 49 dyed fabrics in combination with dyes and fibers were used for the specimen. The Weather-O-meter was used for evaluating the effects of exposure to light for 2.5 to 450 hours. The process of color changes in the CIEL *A*B* color-order system to the exposure time were determined by spectrophotometer at 10$^{\circ}$ observer. Sunlight exposure caused significant changes in the color of natural-dyed fabrics. The degree and nature of color changes on the fabrics were dependent on the combination of fiber and the type of dye used. The groups of violet(Lithospermum erythrorhizon Sieb.et Zucc.) and black color(Ailanthus altissima Swingle, Phus trichocarpa Miq) yielded excellent colorfastness to light. The group of indigo blue color(Polygonum tinctorium Lour.) was also very resistant to fading in both exposure except silk. Whereas the dye groups of Red, Yellow, Orange, Brown colors indicated greatest changes in fading, particularly Carthamus tinctorius L.

• Journal of Advanced Marine Engineering and Technology
• /
• v.22 no.1
• /
• pp.67-76
• /
• 1998

Friction materials for brake linings and clutches have severe performance requirements. The principal function of such frictional elements is to convert kinetic energy to heat, and then either to absorb or to dissipate heat. In order to achieve these objectives, the coefficient of friction must be as high as possible, independent of variations in operating conditions, and the necessary energy conversion must be accomplished with a minimum of wear on the contacting parts. In this study, Al powder, Al bronze powder and Mo powder used in general for automobile brake was sprayed on automobile brake disc to restrain rust and to maintain friction performance. Dynamo and corrosion tests have been carried out. It is concluded that the sprayed disc with Al bronze powder has the most improved frictional performance and anti-corrosive characteristics. The main results obtained can be summarized as follows; 1. From the corrosion current density test for gray cast iron and sprayed disc with powders of Al, Al bronze and Mo, it was cleared that the spray treatment with Al bronze powder showed the most superior anti-corrosive characteristics than other powders. 2. By anode polarization toward the noble direction from corrosion potential, corrosion current density with sprayed brake disc by Al-bronze powder was the lowest. 3. Mean frictional coefficients obtained from dynamo test are as follows : the sprayed disc with Al(99.99%) powder was 0.190 ; the sprayed disc with Al-bronze powder was 0.312 ; the sprayed disc with Mo powder was 0.257 ; the non-sprayed disc of gray cast iron was 0.331. In the case of the sprayed disc Al-bronze powder showed the most excellent frictional characteristics . 4. Amount of burnish quantity obtained from burnish test by dynamometer is as follows : the sprayed disc with Al-powder was 1.079 mm : the sprayed disc with Al-bronze powder was 0.155 mm : the sprayed disc with Mo powder was 0.253 mm : the non-sprayed disc of gray cast iron was 0.241 mm. Al-bronze powder also showed the most excellent burnish characteristics.

• Journal of Advanced Navigation Technology
• /
• v.13 no.6
• /
• pp.991-997
• /
• 2009

Recently, many countries are developing and investing in various homeland security technologies against terrorism. The importance of homeland security has been growing because of nuclear weapon threat from North Korea, the burning of cultural assets, and violence crimes. Therefore, in this paper, we have described and analyzed the trends related to homeland security technology. The main techniques toward homeland security are aggregation technology, integration technology, collaboration technology, categorization technology, intelligence technology, and mining technology. Those are likely to become the growth potentials until fade out of threat. Therefore, we require more government policies to support a budget enlargement.

• Journal of the Korean Society of Costume
• /
• v.58 no.6
• /
• pp.12-23
• /
• 2008

This study reports the costume changes and the factors of the changes from stone status in joseon dynasty. It can be summarized as follows: First, the artisan for the statues is one of the most important factors for the costume changes. The artisans who were involved in building the King's tomb were also made the stone statues for scholars' tombs. This results in that the style of the King's tomb influenced the costumes of stone statues for scholars' tombs. Some craftsmen who were buddhist monks also influenced the introduction of buddhist arts. Second, the stone statues are classified into 3 types according to the dead's social position: the civil officer statues, the military official statues, and the servant statues are installed for the civil officer, the military officers, and others, respectively. This principle was applied well. However, the civil official statues are mainly installed in late joseon dynasty because the civil officers are socially preferred to the military officers in late joseon dynasty. Third, there are two types of civil officer statues; Gongbok type and jobok type. Civil officer statues of Gongbok type were mainly installed in early joseon dynasty and civil officer statues of jobok type were begun to be installed in the early 16th century. Civil officer statues of Gongbok type were fade out after the late 17th century. Fourth, there are three reasons why civil officer statues of jobok type were installed at the officers's tombs 270 years earlier than at the Kings' tombs: 1) Introduction of Daemyunghoejeon and its application, 2) an establishment of a system that requires to prepare jobok individually, and 3) self-confidence of scholars' class on political and cultural maturity.

• The KIPS Transactions:PartB
• /
• v.10B no.6
• /
• pp.611-618
• /
• 2003

In this paper, we describe a fuzzy inference approach for detecting and classifying shot transitions in video sequences. Our approach basically extends FAM (Fuzzy Associative Memory) to detect and classify shot transitions, including cuts, fades and dissolves. We consider a set of feature values that characterize differences between two consecutive frames as input fuzzy sets, and the types of shot transitions as output fuzzy sets. The inference system proposed in this paper is mainly composed of a learning phase and an inferring phase. In the learning phase, the system initializes its basic structure by determining fuzzy membership functions and constructs fuzzy rules. In the inferring phase, the system conducts actual inference using the constructed fuzzy rules. In order to verify the performance of the proposed shot transition detection method experiments have been carried out with a video database that includes news, movies, advertisements, documentaries and music videos.

• Journal of Broadcast Engineering
• /
• v.4 no.2
• /
• pp.155-163
• /
• 1999

In this paper, we propose novel scene change detection and key frame selection techniques, which use two feature images, i.e., DC and edge images, extracted directly from MPEG compressed video. For fast edge image extraction. we suggest to utilize 5 lower AC coefficients of each DCT. Based on this scheme, we present another edge image extraction technique using AC prediction. Although the former is superior to the latter in terms of visual quality, both methods all can extract important edge features well. Simulation results indicate that scene changes such as cut. fades, and dissolves can be correctly detected by using the edge energy diagram obtained from edge images and histograms from DC images. In addition. we find that our edge images are comparable to those obtained in the spatial domain while keeping much lower computational cost. And based on HVS, a key frame of each scene can also be selected. In comparison with an existing method using optical flow. our scheme can select semantic key frames because we only use the above edge and DC images.

• Korean Security Journal
• /
• no.2
• /
• pp.227-258
• /
• 1999

In a broad sense, ‘After-care SYSTEM’ for discharged prisoners mean legal actions of prisoners who have been released from lawful detention In its narrow sense, mean preventive protection and observation activities under regular guidance and supervision against those released from penal facilities after a certain period of detention Therefore, they should not be viewed as objects of mere concern or social work programs but preventive protection should he provided to them as part of national criminal policy After-care system is in the following two ways, The one is based on individual prisoner's request and consent, which is called 'Voluntary After-care system', The other is the one which is not based in personal request or consent but is based on obligation, which is named 'Compulsory After-care system In Korea, however no Compulsory After-care system is in practice Voluntary After-care system is to be carried out 6 method in the following by existing Probation, Parole Law. (1) offer of board and lodging (2) allowance of Traveling expense (3) allowance of occupation instrument or lending rehabilitation fund (4) training of occupation and vocational guidance (5) self-reliance support for After-care probationer (6) guidance of good deed And then to establish the society without offenders is the ideal of human beings, but criminal acts don't fade away, so in the field of the science of criminology, the importance of correctional system has become greater. The correctional idea has moved from severe punishment to educational rehabilitation for the goal of protecting both offender and security from the threat of crime in to day Some it is required that Compulsory After-care system is most important system in effective measures, and that existing Probation, Parole Law in Korea is renewed into Compulsory After-care system in the future.