스포츠 생리학 : 운동과 호르몬 보충 요법이 폐경 초기 여성의 체력, 체구성, 혈액성분, 골밀도에 미치는 영향

정성태,박계순,진영수,조수현,홍기영 한국체육학회 1996 한국체육학회지 Vol.35 No.2

변화하는 수요율을 고려한 다단계 재고모형의 개선 알고리즘

정성태,이상진 육군사관학교 화랑대연구소 2014 한국군사학논집 Vol.70 No.2

The METRIC-based inventory model calculates an optimal level for spare parts stock under average demand rate conditions. However, its application is restricted when the demand rate is altered. For reflecting the dynamic conditions of demand rates, a time-dependent demand rate should be considered. This study is based upon the logic of the ASM(Aircraft Sustainability Model), which can reflect changing demand rate. We improve the accuracy of the model concerning the resupply pipeline by adopting the principle of conditional probability of binomial distribution. Furthermore, this study proposes an improved algorithm for the allocation of spare parts. The proposed algorithm overcomes the drawbacks of the Greedy Algorithm, which sometimes offers suboptimal solutions. The proposed algorithm provides an optimal solution while reducing calculation time significantly. The numerical example demonstrates the degree to which the accuracy of model is improved.

心肺機能 向上을 爲한 줄넘기 運動의 效果

鄭星台 圓光大學校 附設 體力科學硏究所 1977 體力科學硏究 Vol.1 No.-

This study was conducted to determine the effect of rope skipping activity upon Cardiovascular fitness of college students. Fifty subjects skipped rope five times a week for four weeks over Load principle wes applied in the prescribed rope skipping program. Harvard step test was administered to fifty male college students in order to determine their level of cardiovascular efficiency. Comparisons were made from the pre-exercise and postexercise deta. The conclusions of this study was that five times a week for four weeks may improve cardiovascular efficiency.

CT 영상에서 스네이크 알고리즘과 파티클 필터를 이용한 뼈 영역 추출 방법

정성태,김영운,강선경,Jung, Sung-Tae,Kim, Young-Un,Kang, Sun-Kyoung 한국정보통신학회 2018 한국정보통신학회논문지 Vol.22 No.2

본 논문에서는 CT 영상에서 스네이크 알고리즘과 파티클 필터를 이용한 뼈 영역 추출 방법을 제안한다. 스네이크 알고리즘을 이용하여 뼈 외곽선을 추출하고, 이 외곽선을 따라서 파티클 필터를 움직여 가면서 뼈 영역을 추출한다. 뼈 외곽선 주위에 다른 뼈가 근접해 있는 경우에 스네이크 알고리즘이 뼈 외곽선을 완벽하게 추출하지 못할 수 있는데, 이때에 파티클 필터가 이러한 오류를 보완해가면서 뼈 영역을 추출한다. 본 논문에서 제안한 방법을 기존의 형태학적 처리를 이용한 방법과 비교한 결과, 추출하고자 하는 뼈 영역 주위에 다른 뼈가 근접해 있지 않은 경우에는 비슷한 결과를 보였지만, 다른 뼈가 근접해 있는 경우에는 본 논문에서 제안한 방법의 정확도가 높음을 알 수 있었다. In this paper, we propose a bone region extraction method using a snake algorithm and a particle filter in CT image. We extract the bone outline using the snake algorithm, and extract the bone area by moving the particle filter along this outline. If other bones are in close proximity to the bone outline, the snake algorithm may not be able to extract the bone outline completely. At this time, the particle filter extracts the bone area while compensating for the error. In this paper, we compared the proposed method with the conventional morphological processing method. The result is similar when other bones are not close to the bone area to be extracted. However, if other bones are close to each other, The accuracy of the proposed method is higher than the conventional morphological processing method.

한국의 대외투자 수익성 분석 및 시사점

정성태 성균관대학교 경영연구소 2015 자산운용연구 Vol.3 No.2

1998년 이후 경상수지 흑자가 이어지면서 한국의 해외투자자산도 늘어나 2014년말 이후 해외투자자산이 외국인이 보유한 국내자산을 초과하고 있다. 이와 같은 해외투자자산 확대추세는 원자재 가격의 안정, 고령화에 따른 소비성향 저하 등으로 상당기간 이어질 가능성이 높다. 1조 달러에 달하는 해외자산 중에서도 외환보유액과 해외직접투자를 제외한 주식 및 채권(포트폴리오 투자)의 비중은 아직은 상대적으로 작은 편이지만 증가율이 가파르다. 그렇지만 포트폴리오 투자의 성과는 저조한 편이다. 해외투자펀드를 기준으로 할 때 2003년 이후 실현된 손실과 평가손실을 합쳐 6.8조원의 투자손실을 냈다. 이처럼 해외투자의 성과가 낮은 이유로는 투자시점이 나 투자대상의 쏠림 현상 때문으로 보인다. 2007~2008년 중국에 대한 투자, 2011년 이후 브라질채권투자 등이 대표적이다. 해외증권투자 경험이 일천하고 투자네트워크 및 리서치 능력이 부족한 탓도 크다. 정책 측면에서도 해외투자를 환율안정이나 수출증대를 위한 거시경제정책의 도구로 보는 시각을 바꿀 필요가 있다. .

한계분석법과 유전알고리즘을 조합한 다단계 다계층 재고모형의 최적 재고수준 산정

정성태,이상진 대한산업공학회 2014 대한산업공학회 춘계학술대회논문집 Vol.2014 No.5

CT 영상에서 골다공증 판별 방법의 성능 향상

정성태 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.8

Classification methods based on dual energy X-ray absorptiometry, ultrasonic waves, and quantitative computed tomography have been proposed. Also, a classification method based on machine learning with bone mineral density and structural indicators extracted from the CT images has been proposed. We propose a method which enhances the performance of existing classification method based on bone mineral density and structural indicators by extending structural indicators and using principal component analysis. Experimental result shows that the proposed method in this paper improves the correctness of osteoporosis classification 2.8% with extended structural indicators only and 4.8% with both extended structural indicators and principal component analysis. In addition, this paper proposes a method of automatic phantom analysis needed to convert the CT values to BMD values. While existing method requires manual operation to mark the bone region within the phantom, the proposed method detects the bone region automatically by detecting circles in the CT image. The proposed method and the existing method gave the same conversion formula for converting CT value to bone mineral density.

Membership Wholesale Club에서의 상품 진열유형이 적재효율에 미치는 영향에 관한 연구 -표준규격을 중심으로

정성태 한국물류학회 2019 물류학회지 Vol.29 No.6

The purpose of this study is to improve management efficiency by analyzing the loading efficiency of each loading pattern of MWC quantitatively. In the case of the block type and brick type, the average loading efficiency of the T-12 pallet was higher than that of the T-11 pallet, In the case of the pinwheel type, the T-11 pallet is higher than the T-12 pallet. In the T-11 pallet, the pinwheel type loading pattern is the largest part of the improvement of loading efficiency, In the case of the block type, the loading efficiency was confirmed as the lowest with 75.2%. In the T-11 pallet, the pinwheel type loading pattern is the most important factor for improving the loading efficiency, In the case of the block type, the loading efficiency was confirmed as the lowest with 75.2%. In the case of the T-12 type, the block type was found to be 96.2%, the highest loading efficiency pattern. It was confirmed that the case of MWC A, which is being supplied as a T-12 type wooden pallet, is composed of block and brick loading products and display patterns. On the other hand, MWC B and MWC C, which are supplied as T-11 type plastic pallets, have an average loading efficiency of 97.4% when they are pin wheel type rather than block type and brick type, More than 90% of the standard specifications are also diversified into 51 types, confirming that the product and display pattern should be composed of pin wheel loading type. MWC B and MWC C, which are delivered as T-11 pallets, are delivered in the same block and brick loading styles as MWC A, not pinwheel, but do not take into account logistics efficiency. It was confirmed that. In this case, more than 90% of the block loading standard standards proposed in this study (T-11 type pallets) and 36 types of standard standards (T-12 type pallets) can prevent the loss of logistics, In the case of the brick loading type, it is confirmed that the loading efficiency can be improved through the use of 21 types (T-11 type pallets) and 24 types of standard standards (T-12 type pallets) of 90% or more. 본 연구에서는 MWC 각 적재패턴 별 적재효율을 분석함으로써 물류측면의 요인도 고려되고 반영되어야 함을 정량적으로 분석 하여 경영효율화를 제고하고자 한 것이다. 블록적재형과 벽돌적재형의 경우 T-11형 파렛트 보다는 T-12형 파렛트의 평균 적재효 율이 높았으며, 핀휠적재형의 경우에는 T-11형 파렛트가 T-12형 파렛트 보다 평균 적재효율이 높은 것으로 분석되었다. T-11형 파렛트에서 핀휠형 적재패턴이 적재효율 향상의 가장 큰 비중을 차지하고 있으며, 블록형의 경우 75.2%로 적재효율이 가장 낮은 패턴으로 확인된 것이다. T-12형의 경우 블록형이 96.2%로 가장 높은 적재효율의 패턴임을 확인할 수 있었다. 이는 T-12형 목재 파렛트로 납품되고 있는 MWC A사에 있어서 블록적재형 및 벽돌적재형으로 제품 및 진열패턴이 구성되고 있는 점은 바람직한 경 우인 것으로 확인되었다. 한편 T-11형 플라스틱 파렛트로 납품되고 있는 MWC B사와 MWC C사의 경우 블록적재형 및 벽돌적재 형 보다는 핀휠적재형일 경우 평균 적재효율이 97.4%로 매우 높으며, 90% 이상의 표준규격 역시 51종으로 다양하므로 핀휠적재형 으로 제품 및 진열패턴이 구성되어야 함을 확인해 주고 있다. T-11형 파렛트로 납품되고 있는 MWC B사와 MWC C사에 있어서 핀휠적재형이 아닌 MWC A사와 동일한 블록적재형 및 벽돌적재형으로 납품이 이루어지고 있는 점은 물류측면의 적재효율이 고려 되지 않은 것이다. 이 경우 본 연구에서 제안된 90% 이상의 블록적재형 표준규격 17종(T-11형 파렛트)과 36종의 표준규격(T-12형 파렛트)을 통해 물류의 손실을 예방할 수 있으며, 벽돌적재형의 경우에도 90% 이상의 표준규격 21종(T-11형 파렛트)과 24종의 표 준규격(T-12형 파렛트)의 사용을 통해 적재효율이 제고될 수 있음이 확인되었다.

Effect of a combination of 2% lidocaine jelly and thermally softened endotracheal tube on postoperative sore throat

정성태,송지아,이성헌,최정일,이형곤,박수연,황정연,박상희 대한마취통증의학회 2019 Anesthesia and pain medicine Vol.14 No.2

Background: Postoperative sore throat (POST) is a common adverse event after general anesthesia. The aim of this study was to evaluate the effectiveness of 2% lidocaine jelly applied on the single-lumen endotracheal tube (ETT) and thermal softening of the ETT, and a combination of both interventions on the development of POST. Methods: Patients (n = 144) undergoing general anesthesia were randomly assigned to one of four groups: Control group (un-softened ETT lubricated with saline); Lidocaine group (un-softened ETT lubricated with 2% lidocaine jelly); Softened group (thermally softened ETT lubricated with saline); and Combined group (thermally softened ETT lubricated with 2% lidocaine jelly). Sore throat was evaluated at 0, 1, 6, 24, and 48 h after extubation. The occurrence of any postoperative complication was also assessed including hoarseness and coughing. Results: No significant difference was observed in the severity of POST at all time points. However, the incidences of POST for overall (0–48 h) and the immediately following period (0 h) were significantly lower in the Combined group (52.9% and 47.1%) than in the Control group (79.4% and 76.5%), Lidocaine group (81.8% and 78.8%), and Softened group (82.9% and 74.3%). The overall incidence of hoarseness did not differ among the groups. No other postoperative complication was observed in any of the patients. Conclusions: No differences were observed in the severity of POST. However, 2% lidocaine jelly applied on thermally softened ETT reduced the overall incidence of POST. Therefore, this combined intervention could be considered as an alleviating strategy for POST.

A Study on the Effect of Packaging Design Considering SCM Aspects on Logistics Efficiency (Focusing on the case of domestic A company)

정성태 한국포장학회 2020 한국포장학회지 Vol.26 No.1

This study conducted a case study and a questionnaire analysis in parallel. In the case study, a study was conducted on domestic manufacturer A by analyzing pallet loading efficiency of RRP(Retail Ready Packaging) products and pallet loading efficiency of MWC(Membership Wholesale Club) delivered products. As a result of the pallet loading efficiency simulation of 50 RRP products of Manufacturer A, it was 80.0% based on the T-11 type pallet and 84.3% based on the T-12 type pallet. It was found It refers that the route of producing the product from the manufacturer A and delivering it to the MWC A in the form of RRP resulted in the decrease of the pallet loading efficiency through the change of the loading pattern and the adjustment of the number of loads. As a result of analyzing the questionnaire about whether the overall efficiency of the supply chain will be improved if the operation of the packaging system considering the SCM(Supply Chain Management) aspect is χ2 = 178.500, there was a statistically significant difference at the significance level of 0.000. Manufacturers and logistics companies answered “yes” the most, but distributors answered “is average” the most, confirming that the packaging can be constructed with the highest operational efficiency. Therefore, as a result of confirming the impact of packaging design considering the SCM aspect on logistics efficiency, it indicates the importance of closer collaboration between manufacturers and distributors.