• 한국의학물리학회지:의학물리
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• 제17권2호
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• pp.114-122
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• 2006

세기조절방사선치료에는 다엽콜리메타의 구동방식에 따라 static 방법과 dynamic 방법이 있다. 세기조절방사선치료의 정도관리는 치료계획의 정도관리, 치료정보의 전달에 관한 정도관리, 치료전달 과정에 대한 정도관리를 통하여 이루어진다. 여기서는 static 방법과 dynamic 방법에 대하여 같은 조건으로 치료계획 정도관리를 시행하여 dynamic 방법의 환자 적용에 대한 타당성을 살펴보았다. 세기조절방사선치료에서 다엽콜리메타의 움직임이 static 방법인 stop and shoot 방법과 다엽콜리메타의 움직임이 dynamic 방법인 sliding window 방법과 비교검토한 결과 임상표적용적(clinical target volume, CTV)의 크기가 직경 3 cm인 경우에서는 중심점에서의 선량분포 차이가 0.2%였으며, 선량분포의 90% 면적의 차이가 2.7%였으며, CTV의 크기가 직경 7 cm인 경우에서는 중심점에서의 선량분포 차이가 0.2%였으며, 선량분포의 90% 면적의 차이가 2.2%였으며, CTV의 크기가 12 cm인 경우에서는 중심점에서의 선량분포 차이가 0.4%였으며, 선량분포의 90% 면적의 차이가 2.9%였다. 실제 폐암 환자에서도 CTV의 크기에 따라 static 방법과 dynanic 방법에서 중심점에서의 선량 차이는 0.3%에서 0.6%를 나타내고 있다. 가상 펜텀에서는 CTV의 크기에 따라 중심점에서의 측정 선량이나 90% 등선량 곡선 면적이 차이가 없었고, 실제 폐암환자에서는 중심점의 측정선량은 차이가 없었지만 90%등선량곡선의 면적은 CTV 가 커짐에 따라 두 방법간에 차이가 커짐을 알 수 있었다.

• Journal of Pharmaceutical Investigation
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• 제35권3호
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• pp.151-155
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• 2005

A drug delivery system(DDS) for practically insoluble meloxicam was developed and evaluated by dissolution study. A novel DDS is two layered system, where the first layer is consisted of gas-forming agent for an immediate release and the second layer is composed of metolose SR(HPMC) for sustained release. This bilayered tablets were manufactured by using manual single punch machine. The results of dissolution study showed an initial burst release followed by sustained release for the experimental period time. From a pharmaceutical point of view, the designed DDS for meloxicam would be informative system in terms of poorly soluble analgesic medicines.

• Journal of Dental Anesthesia and Pain Medicine
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• 제18권6호
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• pp.367-373
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• 2018

Background: Fear of local anesthesia (LA) is a significant impediment to dental care as many patients delay or avoid treatment to avert pain. Computer-controlled local anesthetic delivery system (CCLAD), with constant and controlled rate of flow, present a painless alternative. The present study aimed to compare anxiety and pain perceived with conventional and computerized systems, for different stages of anesthesia delivery when administering various nerve blocks. Methods: One hundred patients requiring bilateral LA participated in the study. One side was anesthetized using one system and the contralateral side was anesthetized using the other, in two separate appointments. Patients assigned anxiety scores on a 5-point scale and used the visual analogue scale (VAS) for pain determination at needle insertion, during delivery of anesthetic solution, immediately after injection, and at the end of the periodontal procedure. Each patient's preference for the delivery system of future injections was also recorded. Results: Patients reported significantly lower anxiety levels with CCLAD compared to the syringe. Significantly lower mean VAS scores for anesthesia deposition, pain immediately after, and at the end of the periodontal procedure were also noted. However, pain at needle insertion was comparable between the two systems, with no statistical significance. Overall, 64.4% patients preferred CCLAD for future anesthesia. Conclusion: Lower pain perceived with CCLAD and higher preference for the system suggest that CCLAD should replace conventional syringes to allow pain-free dental treatment.

• 제어로봇시스템학회논문지
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• 제17권6호
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• pp.566-572
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• 2011

In recent semiconductor and FPD (Flat Panel Display) manufacturing processes, high clean-class delivery operation is required more and more for short working time and better product quality. Traditionally SLIM (Single-sided Linear Induction Motor) is widely used in the liner drive applications because of its simplicity in the rail structure. A magnetically levitated (Maglev) unmanned vehicle with SLIM traction, which is powered by a CPS (Contactless Power Supply) can be a high precision delivery solution for this industry. In this paper unmanned FPD-carrying vehicle, which can levitate without contacting the rail structure, is suggested for high clean-class FPD delivery applications. It can be more acceptable for the complex facilities composed with many processes which require longer rails, because of simple rail structure. The test setup consists of a test vehicle and a rounded rail, in which the vehicle can load and unload products at arbitrary position commanded through wireless communications of host computer. The experimental results show that the suggested vehicle and rail have reasonable traction servo and robust electromagnetic suspensions without any contact. The resolution of point servo errors in the SLIM traction system is accomplished under 1mm. The maximum gap error is ${\pm}0.25mm$ with nominal air gap length of 4.0mm in the electromagnetic suspensions. This type of automated delivery vehicle is expected to have significant role in the clean delivery like FPD glass delivery.

• 소성∙가공
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• 제13권2호
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• pp.129-136
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• 2004

Recently, instead of a matched die forming method requiring a high cost and long delivery term, a multi-point dieless forming method using a pair of matrix type punch array as flexible dies has been developed. Since the conventional multi-point dieless forming method has some disadvantages of difficulty in precise punch control and high-cost of equipment, a new concept of multi-point dieless forming method combined with an elasto-forming method has been suggested in this study. For optimal selection of elastomers, compression tests of rubbers, polyethylene and foams were carried out together with FEM analysis of the deformation behavior during sheet forming process using a rigid punch and elastomers. Compressive strain was concentrated on the upper central area of the elastomer under the punch, and the rubber exhibited higher concentration of the compressive strain than foams. Two-dimensional curved surface was formed successfully by the multi-point elasto-dieless forming method using an optimal combination of rubber and foam materials.

• 한국군사과학기술학회지
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• 제10권4호
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• pp.30-37
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• 2007

In this paper, Water Entry Point Selection Algorithm(WEPSA) for selecting an optimal Water Entry Point of anti-submarine missiles which maximizes Detection Probability about a given target was investigated. WEPSA is a method which decides the position of an optimal Water Entry Point with calculating the target Detection Probability of a torpedo in the whole domain which centered by the target, performing the Monte-Carlo Simulations which include errors for the target informations and for weapon delivery. We can decide an optimal Water Entry Point of anti-submarine missiles which maximizes Detection Probability about a given target with WEPSA, if we get target informations about target range, target bearing, target speed and target course from Combat Systems.

• 급식외식위생학회지
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• 제4권2호
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• pp.48-54
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• 2023

The study explores the impact of nutritional information on calorie prediction and purchase intent. Administered through self-report questionnaires, the research employs two types of stimuli to assess the influence of nutritional information. Hamburger set images, with or without accompanying nutritional details, were randomly presented to simulate the prevalent mobile app environment for fast-food delivery. Respondents were tasked with predicting calorie content and indicating purchase intent on a Likert 7-point scale. Results show a significant difference in calorie prediction based on the presence of nutritional labeling. While consumers expect positive health effects by estimating more exact calorie information with nutritional labeling, it doesn't significantly influence purchase intent. The study also examines consumer awareness and preferences regarding nutritional labeling policies, emphasizing the need for education and promotion. Most participants recognize the necessity of mandatory nutritional labeling in fast-food establishments, especially through delivery applications, to support healthier choices and prevent obesity.

• 한국시뮬레이션학회논문지
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• 제16권3호
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• pp.1-9
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• 2007

도시에서 수요지점간을 이동하는데 걸리는 시간은 출퇴근시간 및 낮시간대와 같이 시간대에 따라 차이가 발생한다. 또한 배송 경로 중 특정구간에는 아파트나 학교, 기업 등과 간이 배송점이 밀집되어 있어 차량이 이동속도에 영향을 받지 않는 수요지점들이 포함되어있다. 그러나 기존의 차량경로 문제에서는 이러한 차량의 이동속도에 시간대에 따라 정체현상 등을 감안하거나 밀집되어있는 수요지점의 특성 또한 고려되지 않고 있다. 이 밀집지점들의 특성을 파악하여 한 개의 큰 배송점으로 처리하면 고려해야할 배송지점의 수를 대폭 축소할 수 있다. 이러한 점에 착안하여 본 연구에서는 시간대에 따라 수요지점간 이동속도가 달라지는 동적인 환경을 고려하되, 밀집지역을 고려한 차량경로를 구성하는 효율적인 알고리즘을 개발하였다. 개발된 해법은 최적해와 컴퓨터시뮬레이션 모형을 구축하여 최적해와 비교해 봄으로써 그 수행도를 평가하였다.

• 품질경영학회지
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• 제43권3호
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• pp.397-408
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• 2015

Purpose: Express mail service(EMS) supplied by 'Korea POST'is an international postal service which brings letters, documents and parcels to a destination abroad in the fastest and safest way. This service is in a tough competition with global companies such as TNT, FedEx, DHL or UPS. To build an effective strategy for being competitive, an intensive study on EMS service quality should be accomplished from a customer's perspective. Methods: Kano model and improvement gap analysis are used to categorize and prioritize EMS service quality attributes. A 5-point Lickert scale is employed to apply the Kano model and improvement gap analysis. Each quality attribute can be classified as weak in comparison with competitors, critical for improvement, or potentially competitive. Results: Price, on-time delivery and delivery quality are to be kept as is; fast delivery, parking convenience and staff expertise can be potentially competitive; and the other attributes are considered to be critical for improvement. Conclusions: Fast reimbursement and proper compensation when shipping items are lost or damaged are to be improved with high priority. Efforts to secure fast delivery, parking convenience and staff expertise are needed to be competitive in the future.

• 산업융합연구
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• 제15권2호
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• pp.27-36
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• 2017

본 연구에서는 카노 모형과 설문조사를 바탕으로 O2O 배달 앱의 서비스 품질 요인을 분석하고, 서비스 품질을 몇 가지 차원별로 분류하였다. 분석 결과, 일원적 품질요소로는 정확한 정보전달, 다양한 종류의 음식점, 지불방식의 다양성, 메뉴선택의 다양성, 불편사항 해결, 서비스의 친절도, 음식의 맛과 질, 위생과 청결, 간편 결제 시스템 등이었고, 매력적 품질요소로는 최신 정보 업데이트, 신뢰성 있는 이용후기, 다양한 주문방법, 신속한 배달, 브랜드 이미지, 할인 포인트 결제 및 적립 등이었다. 당연적 품질요소는 나오지 않았지만, 불편사항 해결이 당연적 품질요소에 가까운 것으로 나타났다. 무관심 품질요소로는 정보알림 서비스와 이벤트 및 판촉이었다. 본 연구결과는 O2O 배달 앱 서비스 업체들이 어떤 서비스 품질요소에 집중해야 하는지 전략을 수립하는데 많은 도움을 줄 수 있을 것으로 기대한다.