• Journal of Oral Medicine and Pain
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• v.37 no.1
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• pp.47-59
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• 2012

A retrospective study was conducted to determine the patterns of Temporomandibular Disorder(TMD) among adolescents (12-19 years) over last ten years. 174 patients who had visited the Oral medicine of Pusan National University Dental Hospital in 2000 and 491 patients in 2008 were found on chart review. The results obtained were as follows : 1. The number of adolescent patients was significantly increased in 2008 than in 2000, especially in male. 2. Bruxing, clenching, holding habits and bad sleep hygiene were highly increased more in 2008 than in 2000. 3. Osteoarthritis was significantly increased in 2008 than in 2000 and anterior disc dislocation without reduction was slightly increased. 4. The ratio of male to female adolescent patients with osteoarthritis was remarkably increased. Among the patients who had holding, bruxing, clenching habits, significantly increased osteoarthritis found to be common. This could imply holding, bruxing, clenching habits are prominently associated with increasing risk of developing osteoarthritis.

• The Journal of Korean Academy of Prosthodontics
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• v.36 no.6
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• pp.858-866
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• 1998

Soldering is the usual method used to correct an unstable fixed partial denture framework at patient's try-in; However, presoldering base metal alloys is technique-sensitve and results are unstable because it is difficult to maintain uniform heat distribution and to prevent oxidation of an alloy. A cast-joining technique has been developed by Weiss and Munyon for repair, correction and addition to base metal framework. This joining technique eliminates the problem with presoldering of non-precious frameworks. The object of this study was to 1) compare the relative flexure strength and the joining effectiveness of Ni-Cr-Be cast in two pieces and 'pre-soldered' versus in two pieces and 'cast-joined'. 2) determine the effect of increasing the number of retentive grooves on the face of the cast and 3) determine the effect of the relative matched position of groove patterns on flexure strength. The joining effectiveness can be expressed by the ratio of the mean flexure stress of soldered or cast-joined specimens to that of one-piece cast. Resin rods 3mm in diameter were used as pattern of specimens for one-piece casted, presoldered, and cast-joined groups. Cast-joined specimens had two different patterns of retentive grooves on the joined faces. Type A had cross-shaped grooves 1mm in depth. 0.6mm in width. Type B was the same except for the addition of one more retentive groove. In the experiment connecting cast-joined specimens, half of specimens with type A pattern had their patterns on the faces of paired casts matched with each other as mirror image. With the rest pairs, it was proceeded that one of paired casts turned 45 degrees so that the patterns crossed. Half of specimens with type B pattern also had the patterns matched as mirror image; However, here, one of paired casts turned 90 degrees with the other pairs. Retentive groove in this study lacked the intentional undercuts, in contrast with the suggestion of Weiss and Munyon. The specimens were subjected to four-point flexural loading in an Instron testing machine. The midspan flexural stress was calculated at the point of initial plastic strain as determined from a strip-chart recorder or at the point of failure if this occured at a lower stress level. Within the scope of this study, the following results were obtained. 1. The presoldered group showed flexural strength at least 2 times higher than the cast-joined groups. Its joining effectiveness was 82%. 2. In cast-joined groups, the flexural strength of joints with type B patterns exhibited 1.5 times that of joints with type A patterns. Joining effectivenesses were 38% for type B patterns, 25-26% for type A patterns. 3. The relative matched position of groove patterns did not have any significant effect on flexural strength of the cast-joined specimens with either type A patterns or type B patterns(p>.05).

• Journal of the Korea Society for Simulation
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• v.17 no.2
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• pp.91-103
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• 2008

In order to simulate the behavior of automated manufacturing systems, the performance of material handling systems should be measured dynamically. Multi-Agent technology could be well adapted for the development of simulator for distributed and intelligent manufacture systems. A multi-agent system is composed of one coordination agent and multiple application agents. Issues in AGVS simulator can be classified by the set-up and operating problems. Decisions on the number of vehicles, bi- or uni-directional guide-path, etc. are fallen into the set-up problem category, while deadlock tree algorithm and conflict resolution are in operating problem. In this paper, a multi-agent based deadlock-free simulator for automated guided vehicle system(AGVS) are proposed through the use of multi-agent technologies and the development of deadlock-free algorithm. In this AGVS simulator proposed, well-known Floyd algorithm is used to create AGVS Guide path, through which AGVS move. Also, AGVs avoid vehicle conflict and deadlock using check path algorithm. And Moving vehicle agents are operated in real-time control by coordination agent. AGV position is dynamically calculated based on the concept of rolling time horizon. Simulator receives and presents operating information of vehicle in AGVS Gaunt chart. The performance of the proposed algorithm and developed simulator based on multi-agent are validated through set of experiments.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.31 no.1
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• pp.41-48
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• 2008

Enhanced machine reliability has dramatically reduced the rate and number of railway accidents but for further reduction human error should be considered together that accounts for about 20% of the accidents. Therefore, the objective of this study was to suggest a new taxonomy of performance shaping factors (PSFs) that could be utilized to identify the causes of a human error associated with railway accidents. Four categories of human factor, task factor, environment factor, and organization factor and 14 sub-categories of physical state, psychological state, knowledge/experience/ability, information/communication, regulation/procedure, specific character of task, infrastructure, device/MMI, working environment, external environment, education, direction/management, system/atmosphere, and welfare/opportunity along with 131 specific factors was suggested by carefully reviewing 8 representative published taxonomy of Casualty Analysis Methodology for Maritime Operations (CASMET), Cognitive Reliability and Error Analysis Method (CREAM), Human Factors Analysis and Classification System (HFACS), Integrated Safety Investigation Methodology (ISIM), Korea-Human Performance Enhancement System (K-HPES), Rail safety and Standards Board (RSSB), $TapRoot^{(R)}$, and Technique for Retrospective and Predictive Analysis of Cognitive Errors (TRACEr). Then these were applied to the case of the railway accident occurred between Komo and Kyungsan stations in 2003 for verification. Both cause decision chart and why-because tree were developed and modified to aid the analyst to find causal factors from the suggested taxonomy. The taxonomy was well suited so that eight causes were found to explain the driver's error in the accident. The taxonomy of PSFs suggested in this study could cover from latent factors to direct causes of human errors related with railway accidents with systematic categorization.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.23 no.3
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• pp.109-121
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• 2010

Objectives : This study was performed to analysis the effect of oriental medical care for inpatients with facial paralysis that had visited Dept. of Otolaryngology Oriental medical hospital Dong-eui university. Methods : From January 2008 to September 2010, a clinical study was done on 250 inpatients who were treated as facial nerve paralysis at the Dept. of Otolaryngology Oriental medical hospital Dong-eui university. This study was assessed using the chart analysis. Results : 1. The distribution of sex : female 54.8%, male 45.2%. The distribution of age was pregented that fifty to sixty was the most in 67 cases(26.8%). 2. The distribution of the period of admission : female 12.5 days, male 9.9 days. 3. The distribution of past history : hypertention(18.8%), diabetes-mellitus(10.85%), facial paralysis(9.25%), cerebrovascular disease(4.4%), liver disease(5.6%), hyperlipidemia(1.2%), otitis media(1.2%), herpes zoster(1.2%), cardiac disease(2.45%), thyroid disease(1.2%). 4. The distribution of the region of facial paralysis : Rt(55.36%), Lt(56.52%). 5. Check the mastoid pain : 66.8%(female 73.91%, male 58.04%). 6. Out of prescription(Ko-Bang, 古方), Galgeun-Tang(葛根湯) and Gaejigeogaegayoungchul-Tang was used most in each 34 cases, Daesiho-Tang(大柴胡湯) 30 cases, Galgeungabanha-Tang(葛根加半夏湯) 27 cases, Sihogaeji-Tang(柴胡桂枝湯) 14 cases, Hwanggigaejiomul-Tang 12 cases, Odu-Tang(烏頭湯) 10 cases, Chijadaehwangsi-Tang 10 cases, Gaejigagalgeun-Tang(桂枝加葛根湯) 7 cases, Banhasasim-Tang(半夏瀉心湯) 5 cases, Injinho-Tang(茵蔯蒿湯) 5 cases in order. 7. The distribution of herb group : Mahwang-Jae(麻黃劑) 31.72%, Gaeji-Jae(桂枝劑) 26.00%, Siho-Gae(柴胡劑) 20.70%, Chija-Gae(梔子劑) 7.49%, Buja-Jae(附子劑) 4.41%, Banhahwanggeum-Gae(半夏黃芩劑) 3.08%, Daehwang-Gae(大黃劑) 2.64%, Bockryeong-Gae(茯笭劑) 1.76%, Jisil-Gae(枳實劑) 1.32%, Insam-Gae(人蔘劑) 0.88% in order. 8. The distribution of House-Brackmann grade of admission : Gr Ⅳ 74.85%, Gr.III 13.6%, Gr.V 11.6% in order. 9. The distribution of House-Brackmann grade of discharge : Gr.III 56%, Gr.IV 38.4%, Gr.II 5.6% in order. 10. The average number of OPD follow up is 6.46. Conclusion : This results indicated that oriental medical treatment with Ko-bang(古方) can be an effective way to treat facial paralysis. The more patients we treat with Ko-bang(古方), the more clinical report is accumulated. Then it would be helpful to map out a systematic treatment on facial paralysis.

• The Journal of Korean Physical Therapy
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• v.13 no.1
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• pp.83-96
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• 2001

The purpose of this study is to provide the fundamental information fer the rehabilitation of hand injury and to emphasize the point of early treatment of hand injury after operation. The subjects are composed with the physical therapists who care hand injury and are engaged in 76 university hospitals,59 general hospitals and 88 semi and local clinics respectively. Investigator take the research form chart with 41 questionnaire and use the cross tabulation frequencies and one-way ANOVA of SPSS WIN(ver 10.0) for the statistic analysis. The results of this research are as follows :1. The number of physical therapists who care hand injury are 110 men and 113 women. 2. The beginning period of active assistive exorcise on the various type of injuries are as follows: At the case of flexor tendon injury, the most part of physical therapists make response to the period that is above 4 weeks in the rate of 29.1%. At the case of fracture, the most part of physical therapists make response to the period those are from 3 weeks to less than 4 weeks and from 4 weeks to less than 5 weeks in the rate of 28.7% respectively. At the case of crushing injury, the most part of physical therapists response to the period that is above 4 weeks in the rate of 32.2%. At the case of amputation injury, the most part of physical therapists response to the period that is above 4 weeks in the rate of 40.4%. 3. In the physical therapy request, treatment period are mentioned in 22.0%. 4. The most difficult factors in the hand treatment is to contracture soft tissue and joint to physical therapist in the rate of 59.6%. 5. Among the reasons of the intervention between physical therapy request and actual treatment, the case of wrong physical therapy request is examined in 69.4%.

• The Korean Journal of Emergency Medical Services
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• v.8 no.1
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• pp.117-126
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• 2004

In general, the patients who transferred to the hospital by 119 rescue service at night go to the emergency room(ER) of general hospital rather than that of their nearby the 1st(clinic) and 2nd(local hospital) hospital. And the hospital is mainly selected not by 119 EMST but by patients or his/her conservators. Therefore we had studied retrospectively with emergency situation diary and medical chart for 697 patients of being transferred to one emergency medical center for 6 months since January 2004, and results are as follows. 1. The 280 patients(42.5%) of being transferred hospital at night by 119 rescue service were not emergency case and their average staying time in hospital was about $7.15{\pm}10.06$ minutes. 2. Transfer time was distributed in each time intervals of 1819, 2021, 2223, and 2401 and patients ratio in each intervals were 15.1%, 17.8%, 16.4%, and 15.2%. 3. In response of ambulance, the average time from the spot to the hospital was $14.53{\pm}9.27min$. and average distance of that was $7.95{\pm}9.21km$. 4. Diseases rather than traffic accidents or traumatic injury were main causes of ambulance calling and its value was 533(76.5%), and accidents were mainly occurred in patients' house and its value was 479(68.7%). 5. In time of transfer by 119 rescue service, hospital was mainly selected by patient/conservator and its value was 648(93.0%). In result. the hospital was selected not by EMST but by patient/conservator. 6. The case that the 1st grade EMT was rode in ambulance was 161(23.1%), and the case that 2nd EMT and emergency team member who educated for emergency were rode in ambulance were 504(72.3%). So the number of the 1st grade EMT was short in fire station of Kwangju metropolitan city than other city. 7. The first aids for patients before reaching hospital were limited to oxygen inhalation, airway control, and BLS for maintaining limbs and spine. So it seems to be a simple patients transfer. Consequently, to establish an efficient emergency medical system, it has been thought that it should be advanced a moderate education and public information about the appropriate use of emergency medical system toward citizen, and also need the hospital selection by the patients categorizing standards for 119 rescue service member, securing the 1st grade EMT, appropriate first-aids education, and securing professional human power in emergency room of the Ist(clinic) and 2nd(local hospital) hospital at night.

• Korean Journal of Community Nutrition
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• v.18 no.6
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• pp.644-651
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• 2013

Although there has been a significant increase in breast-feeding (BF) rate in Korea, it is plateaued since 2008 and still low compared with that of other countries. Because BF has been related to lower obesity prevalence in many studies and the increase in childhood obesity became evident in Korea, we wondered if a relatively lower BF rate has anything to do with this increase. Therefore, we looked into the relationship between mode & duration of BF during infancy and weight status of toddlers using the data from Korea National Health and Nutrition Examination Survey 2008 through 2011. Number of 2-3 year old toddlers with complete information on BF, anthropometry and normal birth weight was 674. While 87% of them were ever-breastfed, 6.2% each of them were either obese or overweight based on the Standard Growth Chart for Korean Children. Not only the obesity prevalence was different among groups of different mode of feeding, but also the mean duration of BF was significantly longer in normal weight group (9.2 mo.) compared with obese group (5.5 mo.). Accordingly, overweight and obesity prevalence of the toddlers breast-fed for 12 months or longer was significantly lower than that of the toddlers breast-fed for less than 12 months (OR 0.53, 95% CI 0.32-0.87). This study revealed that both BF and duration of BF affect the childhood obesity and, BF for 12 months or longer should be encouraged more aggressively as one of the main strategies to prevent and/or decrease childhood obesity in Korea.

• Journal of the Korean Chemical Society
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• v.43 no.5
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• pp.552-563
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• 1999

The study investigated and analyzed the middle school student's science textbook learning methods and strategies. The Preferred Mehtod of Study (PMOS) and a clinical interview method were utilized. Results indicate that there is a meaningful and significant positive correlation between the number of times students read a chapter of the science textbook and their science grade point. Students do not tend to alter learning strategies dependent upon the subject matter studied, but easily alter stratgies dependent upon the types of the test. Most students could not construct "organiztional tools" such as a summary, a chart, a talbe, or a figure when they study textbook, but might pursure and prefer only one method when they choose their learning strategise. Very few students (less than 1%) among those queried consciously try to connect between prior knowledge and new concepts in the textbook. Even though students choose the textbook for learning science in the beginning, they prefer to stick to reference and exercise materials. Therefore, detailed and direct studise of the student's learning methods and strategies, as well as research on cognitive psychology and motivational psychology, are necessary in order to develop a new textbook with student-based learning materials. By understanding the student's konwledge level through investigation of his or her learning style, an effective science education program can be realized. Finally, the role of the textbook as a tezching/learning material can be maximized by investigating and understanding the student's learning method and strategy with emphasis on reciprocal action between textbooks.

• Proceedings of KOSOMES biannual meeting
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• 2007.05a
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• pp.101-108
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• 2007

Tugboat has carried out the important role and service in the maritime industry construction, such as port and sea bridge construction, fairway dredging and sea reclamation etc. Furthermore, tugboat takes the largest portion in number of vessel at the domestic registry and barges as big as the general merchant vessel, which are getting specialized and larger, are in operation. In spite of the increase of marine accident under this situation, there has been no proper measure for the safe navigation of tugboat in the aspect of a nation. This paper aims to propose the measure for the safe navigation of tugboat according to the frequent marine accident of tugboat with sea bridge. Therefore, we show a example of the sailing schedule and operation checklist based on the analysis of statistics and precedent of marine accident and the investigation of the actual operation state of tugboat in the aspect of a contract of carriage and a personnel setup, which should be checked by the operator of tugboat, pass through sea bridge safely and propose the safe traffic supporting system based on electronic chart system to improve the safe navigation of tugboat.