Long-term Stability after Reduction of Mandible Fracture by Keyhole Plate: Evaluation at the Time of Plate Removal

Cheon, Kyeong-Jun,Cho, Seoung-Won,Jang, Won-Seok,Kim, Ju-Won,Yang, Byoung-Eun Korean Association of Maxillofacial Plastic and Re 2020 Maxillofacial Plastic Reconstructive Surgery Vol.42 No.-

Background: Various types of miniplates have been developed and used for the reduction of facial bone fractures. We introduced Yang's Keyhole (YK) plate, and reported on its short-term stability. The purpose of this study was to evaluate the long-term stability of the YK plate, as a follow-up study, by examining the patients who had used the YK plate among the patients with the reduction of mandible fractures and who visited for plate removal. Methods: We reviewed the medical records of 16 patients who underwent mandibular fracture fixation using a YK plate (group I) and 17 patients who underwent mandibular fracture fixation using a conventional plate (group II). Assessment was then made on malunion, occlusal stability, discomfort during the application, and clinical symptoms. Results: From January 2015 to December 2017, a total of 36 patients underwent mandibular fracture surgery using a YK plate. A total of 16 patients received plate removal. Among them, 15 were male and 1 female. The average age was 26 years. The applied surgical sites were the 12 on mandibular angle, 4 on mandibular symphysis, and 2 on subcondyle. The application period of YK plate was an average of 335 days. During the same period, 45 people underwent surgery on the conventional plate. A total of 17 patients received plate removal. Among them, 15 were male and 2 females. The average age was 36 years. The applied surgical sites were the 8 on mandibular angle, 4 on mandibular symphysis, and 2 on subcondyle. The application period of the conventional plate was an average of 349 days. No malocclusion occurred at the time of removal, and occlusion was stable. No patient complained of joint disease or discomfort. Conclusion: The YK plate system, in which the screw was first inserted and the plate was applied, for clinical convenience did not cause any particular problem and no significant difference from the conventional plate.

자판기 시스템 운영문제의 휴리스틱 해법 개발과 평가

박양병(Yang Byung Park),장원준(Won Jun Jang),박해수(Hae Soo Park) 한국산업경영시스템학회 2011 한국산업경영시스템학회지 Vol.34 No.4

The operation of vending machine system presents a decision-making problem which consists of determining the product allocation to vending-machine storage compartments, replenishment intervals of vending machines, and vehicle routes, all of which have critical effects on system profit. Especially, it becomes more difficult to determine the operation variables optimally when demand for a product that is out-of-stock spills over to another product or is lost. In this paper, we propose a heuristic for solving the operation problem of the vending machine system and evaluate it by comparing with Yang’s algorithm on various test problems with respect to system profit via a computer simulation. The results of computational experiments show a substantial profit increase of the proposed heuristic over Yang’s algorithm. Sensitivity analysis indicates that some input variables impact the profit increase significantly.

Siloxane-Epoxy(s) Copolymer合成에 관한 硏究

梁在乾,韓貞璉,裵長淳 단국대학교 1981 論文集 Vol.15 No.-

Oligosiloxane prepared which has moleculae weight 900∼1,000 was prepared from O.M.C.S. and epoxy(S) resine was prepared from pisphenol(S) and epichlorohydrin. The siloxane-epoxy(S) copolymer was synthesized through the copolymerization of oligosiloxane and epoxy(S) resine under alkaline acetone solution at 50∼55℃ for 5 hours. Thermal properties of epoxy(S) resine and siloxane-epoxy(S) copolymer was measured by thermogravimetric analysis, copolymer with 8.2% silicon content had the higher degradation temperature 300℃ than epoxy(S) reine which degradation at 250℃.

광고에 적용된 심리학적 원리 : 광고사례분석을 중심으로

장형석,김양우,신문표 심리과학연구소 2002 심리과학연구 Vol.3 No.-

The Purpose of this paper was to analysis on commercial advertisement which is applied psychological principles. At first, short review of various psychological principles was presented. Behavioral, cognitive and social psychological principles were included in this short review. On bases of this review, psychological principles were analysed to commercial advertisement case. We knew that many principles were applied to advertisement. In other words, many advertisements were made of psychological principles. The suggestion and problem of this paper was discussed. 본 논문의 목적은 TV, 잡지, 신문과 같은 매체에서 다루어지는 광고에 어떤 심리학적 원리가 적용되었는지를 분석해보는 것이었다. 먼저, 여러 가지 심리학적원리에 대한 간략한 개관을 하였다. 이 개관에는 행동주의 심리학, 인지심리학 및 사회심리학내의 몇 가지 이론이 포함되어 있다. 그런 후에 각각의 광고사례에 어떤 심리학적 원리가 응용되었는지를 분석해보았다. 그 결과 다양한 광고에서 다양한 심리학적 원리가 적용되고 있음을 알 수 있었다. 즉, 광고제작자가 알든 모르든 간에 광고는 다양한 심리학적 이론을 기초로 제작되었고, 광고에는 그러한 심리학적 원리가 작용되고 있음을 알 수 있었다. 그러나 본 논문에서는 단순히 특정 심리학적 원리가 적용된 사례를 찾아 분석해보는 것이었으므로, 특정 광고에 특정 심리학적 원리만 적용된다고 볼 수는 없다. 이러한 점에 대한 간략한 논의를 제시하였다.

유연한 수리계획 작성을 위한 모형관리자의 설계 및 구현

양영철,장양자,김기동,박진우 한국경영과학회 2001 한국경영과학회 학술대회논문집 Vol.- No.1(2)

Recently, in the competitive environments, every company recognizes the importance of planning models. However, there are so many problems in correctly applying mathematical model to the real world. Because mathematical modeling packages, especially, charge planning managers with understanding the models and responsibility for generating plans, fast and accurate model cannot be generated with ease. In this paper, we design the system that helps planning managers flexibly create and modify mathematical models and manage model versions. Also, we implement this model management system with model base concept.

Li 화합물을 첨가한 CaSO₄:Dy 열중성자 측정용 TLD 소자 개발

양정선,김두영,박재우,김장렬,장시영 제주대학교 방사능이용연구소 2003 연구보고 Vol.17 No.-

Personal neutron dosimetry is quite a difficult area because a neutron is always accompanied with gamma radiation, which is required of a capability for mixed field dosimetry. CaSO₄:Dy phosphor is known to have a very high sensitivity to gamma, but the neutron capture cross section of the constituents of CaSO₄:Dy are so small that the interactions between the thermal neutron and the phosphor are rare. One method to improve the neutron interaction is by introducing an impurity ion with a large thermal neutron captures cross section into the phosphor to act as a neutron target centre such as 6Li. In neutron-gamma mixed radiation fields, if two detectors for the 6Li-7Li compounds embedded CaSO₄:Dy TL pellets are used, a 6Li-compound embedded pellet can detect the neutron and gamma radiation together, and the other pellet can only detect the gamma radiation. Recently Korea Atomic Energy Research Institute (KEARI) has developed a new type of CaSO₄:Dy TL materials embedded with phosphorous (KCT-300) to detect beta and gamma radiation with a very high sensitivity[1]. This paper presents the development of CaSO₄:Dy TL pellets embedded with 6Li compound for a thermal neutron measurement, and the detection method of the neutron and gamma dose in mixed fields with CaSO₄:Dy TL pellets embedded with a 6Li compound(KCT-306) and CaSO₄:Dy TL pellets embedded with a 7Li compound(KCT-307) is introduced. The net neutron sensitivity of CaSO₄:Dy TL pellets embedded with 6Li compound developed in this study is higher than that of the TLD-600 (Harshaw Co.) dosimeter which is available in the open market.

열형광 CaSO₄ : Dy 소자의 최적 제조조건에 관한 연구

양정선,장시영,김장렬,김두영,남영미,박재우 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1

An experimental investigation has been performed to determine optimal conditions for preparing the thermoluminescent CaSO_(4):Dy pellets which have been widely used as personal radiation dosimeter material. Our investigation has shown that an optimal weight concentration of the dopant Dy in the bulk CaS0_(4):Dy is 0.1 mol%. and an optimal temperature of adding Dy in the preparing process is 320℃. An optimal time and temperature for sintering the CaSO_(4):Dy crystal produced from the chemical process are found to be 2 hours and 800℃. respectively. The maximum thermoluminescent sensitivity was observed when the CaSO_(4):Dy crystal was pulverized to grain sizes of 63 - 200 m in diameter before being fabricated into pellets. The commercial Teflon was selected as an adhesive for the fabrication of the CaSO_(4):Dy pellets with an optimal mixing ratio of the Teflon and CaSO_(4):Dy being 70 to 30 in weight.

바이오피드백 훈련이 만성 두통 환자의 임상 증상 및 스트레스 반응에 미치는 효과

장명선,하양숙,정진상,유범희 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.6

Objectives : This study aimed to examine the effect of biofeedback treatment on the clinical symptoms and stress responses in chronic headache patients. Methods : We recruited 18 chronic headache patients who were treated with 8 sessions of biofeedback treatment and 18 age and sex-matched control headache patients. All subjects consisted of patients with chronic tension headache and migraine hea-dache. Stress responses were measured using Symptoms of stress (SOS) inventory and all subjects performed Beck depression inventory (BDI), Spielberger state anxiety inventory (STAIS), and visual analogue scale (VAS). Biofeedback physiological vaiiables including frontal and forearm EMG, electrodermal response (EDR) and skin temperature at pre-and post-treatment were also measured in all subjects. Results : Compared with control patients, patients on biofeedback treatment showed significant reduction in scores of STAIS(t=3.705,P<.001),andVAS (t=3.392, p=.001) as well as SOS subscales ; peripheral manifestations (t= 1.788, P=.042), habitual pattems (t=2.008, P=.027), depression (t=2.081, P=.023), anxiety (t= 1.990, P=.028), and total score (t=2.045, p=.025). There was a significant increase of skin temperature (t= -1.835, P=.038) only in the biofeedback treatment group. Conclusion : These results suggest that biofeedback treatment may be effective in relieving chronic headache by reducing psychological and physiological stress responses.

복강 내 체액의 Cytokine 농도를 이용한 난소암과 양성난소질환의 감별진단

양선문,송경은,서장수,조영래 대한임상병리학회 2000 대한임상병리학회지 Vol.20 No.6

Global-MAHN에서 라우팅 오버헤드 개선에 대한 연구

張良根,金玄旭,李光培,吳世德,裵振勝,金在浩 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-

In this Paper, we studied the mechanism that increases the network reliability and decreases network load in GMAHN environment based on the AODV routing protocol. This proposed algorithm is the research on the algorithm, minimizing network overhead by preventing unnecessary network overhead previously and adapting Local repair mechanism to efficient data transmission when route error happens in network, in GMAHN environment. To evaluate the proposed algorithm's performance, we analyzed the proposed algorithm and adapting in various experiment environment according to 5 experiment viewpoint such as node movement, gateway network zone, mobile node number, flow number. After evaluating the experiment, we confirmed better network improvement altogether through following result such as total average data reception rate's increase, average data transmission time's decrease, network overhead's decrease than existing GMAHN algorithm.