한계분석법과 유전알고리즘을 조합한 다단계 다계층 재고모형의 최적 재고수준 산정

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

비동기 회로의 기술 방법에 관한 연구

정성태 圓光大學校 1995 論文集 Vol.30 No.2

본 논문에서는 기존의 비동기 회로의 기술 방법을 비교 분석하고 통합된 비동기 회로의 합성모델을 제안한다. 비동기 회로의 기술 방법으로는 신호 전이 그래프와 비동기 유한 상태기가 있다. 기존의 합성 방법에서는 두 가지 기술 방법 중에서 한 가지 기술 방법만을 지원하는데, 본 논문의 비교 결과에 의하면 두 가지 기술 방법은 나름대로의 장단점을 가지고 있어서 두 가지 기술 방법을 모두 지원하는 합성방법이 설계의 효율성을 증대시킬 수 있을 것이다. 본 논문에서는 통합된 합성 모델로서 비동기 유한 상태기를 신호 전이 그래프로 변환하여 합성하는 방법을 제안한다. This paper compares the specification methods for asynchronous circuits and suggests an integrated synthesis environment for asynchronous circuits. The specification methods for asynchronous circuits can be classified into two categories: signal transition graphs and asynchronous finite state machines. According to the comparison result of this paper, the two specification methods have their own merits. Therefore an integrated synthesis environment is needed which can support two specification methods. This paper suggest an integrated synthesis environment which transforms asynchronous finite state machines into signal transition graphs and then synthesizes asynchronous circuits from the signal transition graphs.

서울올림픽과 스포츠과학-인간과학의 효율화에 큰 계기

정성태,Jeong, Seong-Tae 한국과학기술단체총연합회 1988 과학과 기술 Vol.21 No.6

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.

항산화제와 운동강도가 MDA 의 활성에 미치는 영향

정성태,정덕조 한국운동과학회 1999 운동과학 Vol.8 No.3

항산화제와 운동강도가 MDA(지질 과산화물질)의 활성에 미치는 영향. 운동과학, 제8권 제3호, 423-436, 1999. 운동강도와 항산화 비타민 복합섭취에 따라 지질 과산화물질인 MDA의 활성이 어떻게 변화하는지를 규명하기 위해서 중학교 학생 42명을 대상으로 5주간의 트레이닝 처치(비운동, 저강도운동; AT80%, 고강도운동; AT110%)와 항산화 비타민를 복합섭취(vitamin C+E, placebo)하여 운동상황(안정시, 운동직후, 회복90분)에 따른 지질 과산화 정도를 파악하고, 항산화 비타민 복합섭취 효과를 규명하고자 하였다. 그 결과 지질 과산화물질인 MDA의 활성변화는 고강도 운동시에 크게 증가하였으며, 회복기간동안에는 약간 증가하는 경향을 보였다. 그러나 비운동시나 저강도 운동시에는 별 영향을 받지 않았으며, 회복기간동안도 별다른 변화 양상이 나타나지 않았다. 산화스트레스에 의한 결과 산물인 지질 과산화물은 고강도 운동에 의해 야기되고 아울러 운동량에 의해서 영향을 받을 수 있다는 것과 항산화제를 투여함으로써 체내에 생성되는 지질 과산화물질인 MDA를 감소시킬 수 있음을 알 수 있었다. The effect of antioxidants supplementation and exercise intensity on the lipid peroxidation. Exercise Science, 8(3); 423-436, 1999. The purpose of this study was to investigate the effect of antioxidants supplemetation and exercise intensity on the activities of lipid peroxidation. Forty two middle school students(M, 14.7±0.5yr) were participated in the maximal exercise test before and after 5weeks antioxidants vitamin supplementaion. The subjects were divided into two groups; vitamin C+E supplementation group(N=24), placebo group(N=24). Then each group was devided into three subgroup : Non-exercise group(N8=8), AT80%(low intensity) exercise group(N=8), AT110%/(high intensity) exercise group(N=8). To investigate the effect of antioxidants supplementation the activities of Antioxidants enzymes were measured at rest, immediately after exercise and 90min recovery Maximal exercise testing(A strand protocol; 0.5kp/2min) by cycle ergometer was used as a test protocol. The programs of exercise groups were aerobic and fitness exercise for 5 weeks. Low intensity(AT 80%) group exercised for 60min per day(5days/week) and high intensity(AT 110%) group exercised for 120min. Vitamin C(2,000㎎/day) and Vitamin E(1000IU/day) were given for 5 weeks. Venous blood samples were drawn at the forearm antecubital vein at rest, immediately after exercise and 90min recovery. The concentration of plasma malondiadehyde(MDA) was analized in venous blood. The blood samples were stored at -80℃ and carried to laboratory immediately for analysis. The results of the study can be summerized as follows : First, MDA levels of vitamin C+E supplementation group in high intensity exercise and the other groups were very alike but those of placebo group in high intensity exercise was much higher. The concentration of MDA existed in intensity to add to oxicative stress. The change of lipid peroxidation caused by high intensity exercise was significantly different according to vitamin C-E supplementation. The concentration of MDA decreased by vitamin C+E supplementation. The effect of vitamin C+E supplementation was beneficial to reduce the concentration of MDA caused by high intensity exercise. Vitamin C and vitamin E seemed to have a synergistic effect each other. In conclusion, it has been found that high intensity exercise-induced oxidative stress caused lipid peroxidation(MDA) increase. But dietary antioxidants had detoxifying effects on peroxides produced by high intensity exercise. Therefore, it has been suggested that vitamin C+E supplementation treatment (or 5weeks may protect oxidative damage from various oxidative stress produced by strenuous exercise.

시간 제한 조건을 가진 자유 선택 신호 전이 그래프로부터 비동기 회로의 합성

정성태,정석태,Jeong, Seong-Tae,Jeong, Seok-Tae 한국정보처리학회 2002 정보처리학회논문지 A Vol.9 No.1

This paper presents a method which synthesizes asynchronous circuits from free-choice Signal Transition Graphs (STGs) with timing constraints. The proposed method synthesizes asynchronous circuits by analyzing: the relations between signal transitions directly from the STGs without generating state graphs. The synthesis procedure decomposes a free-choice STG into deterministic STGs which do not have choice behavior. Then, a timing analysis extracts the timed concurrency and tamed causality relations between any two signal transitions for each deterministic STG. The synthesis procedure synthesizes circuits for each deterministic STG and synthesizes the final circuit by merging the circuits for each deterministic STG. The experimental results show that our method achieves significant reductions in synthesis time for the circuits which have a large state space, and generates circuits that have nearly the same area as compared to previous methods. 본 논문에서는 시간 제한 조건을 가진 자유 선택 신호 전이 그래프로부터 비동기 회로를 합성하는 방법을 기술한다. 이 방법에서는 상태 그래프를 생성하지 않고 신호 전이 그래프로부터 직접 신호 전이들간의 관계를 구하여 비동기 회로를 합성한다. 본 논문의 합성 방법에서는 자유 선택 신호 전이 그래프를 선택 행위가 없는 결정성 신호 전이 그래프에 대하여 타이밍 분석을 수행하여 임의의 두 신호 전이 사이의 시간 제약 병렬 관계와 시간 제약 인과 관계를 구한다. 다음에는 이 관계들을 이용하여 각 결정성 신호 전이 그래프에 대한 합성을 수행하고 그 결과를 합병함으로써 전체 회로를 합성한다. 실험 결과에 의하면 본 논문에서 제안한 합성 방법은 상태 공간이 큰 회로에 대하여 현저하게 합성시간을 단축시킬 수 있을 뿐 만 아니라 기존의 상태 그래프 기반 합성 방법과 비교하여 거의 같은 면적의 회로를 합성한다.

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.

장기간의 복합 항산화제의 섭취가 최대 운동시 쥐 심장근의 MDA 생성에 미치는 영향

정성태,김준수,전태원,유승민,이왕록,김연수,정덕조,박지영 한국운동과학회 2000 운동과학 Vol.9 No.2

장기간의 복합 항산화제 섭취가 최대 운동시 쥐 심장근의 MDA 생성에 미치는 영향. 운동과학, 제9권 제2호. 299-308, 2000. 본 연구의 목적은 장기간의 복합 항산화제 섭취(비타인 E, C, B_6, β-carotene, selenium)가 최대 운동시 쥐 심장근의 산화적 손상에 미치는 영향을 규명하는 것이다. 본 연구의 실험동물은 Sprague-Dawley계 흰쥐 수컷 32마리를 대상으로 하였다. 실험동물은 각 집단에 8마리씩 G1(통제집단), G2(비항산화 섭취 및 운동집단), G3(항산화섭취 및 비운동집단) 밀 G4(항산화섭취 및 운동집단)등으로 무작위 할당하였다. 비 항산화 섭취군(n=16)은 16주 동안 일반 쥐 사료(Samyang, Inc., Korea)를 섭취하였으며 항산화섭취군 (n=20)은 비타민 E(200 IU/㎏/day), 비타민 C(50 ㎎/rat/day), 비타민B_6(250 ㎍/㎏/day), 베타카로틴(300 ㎎/㎏/day)과 셀레니움(0.1 ㎎/㎏/day)을 혼합한 사료를 같은 기간 섭취하였다. 식이 처치가 끝난 16주 뒤 운동군(n=16, G2 & G4)은 쥐 트레드밀을 이용하여 최대운동(25 m/min), 경사도 15%, ∼50±10 min)을 실시하였다. 운동이 종료되면 곧 바로 쥐를 해부하여 쥐의 심장근을 획득하고 획득한 심장근은 계획된 분석방법을 통하여 산화적 손상정도로써는 MDA 생성량(Uchiyama and Mihara, 1978)을 측정하였다. 각 조직의 단백질 농도는 Lowry 법을 이용하여 분석하였다. 산화적 손상정도 분석이 끝나면 각 집단별로 평균과 표준편차를 구하고 이원변량 분석을 실시하였다. 이상의 연구 절차를 통해 얻은 연구결과는 다음과 같다. 최대운동은 쥐 심장근의 MDA 생성을 유의하게 증가시키는 것으로 나타났다(p<.5). 또한 장기간의 복합 항산화제 섭취는 쥐 심장근의 MDA 생성을 유의하게 감소시키는 것으로 나타났다(p<.5). 즉 탈진적 최대운동은 산화적 스트레스를 유발하여 조직의 산화적 손상을 유발하며 심장근의 MDA 생성을 증가시키나 장기간의 복합 항산화제의 섭취는 운동으로 인한 조직에서의 산화적 스트레스를 경감시켜 심장근의 MDA 생성량을 감소시키는 것으로 나타났다. The Effect of a long-term Antioxidants Supplementation on MDA product of Heart immediately after maximal exercise in Rats. Exercise Science, 9(2): 299-308, 2000. The purpose of this present study was to investigate the effect of a long-term antioxidants srpplementation on oxidative damage of heart immediately after maximal exercise in rats. Thirty two male Sprague-Dawley rats(4 weeks old) were used as subjects. The subjects were divided into 4 groups such as, G1(n=8 in control group), G2(n=2 in non antioxidants exercise group), G3(n=8 in antioxidants control group) a G4(n=8 in antioxidants exercise group). Non-antioxidants group(G1 & G2) fed general food (Samyang, Inc., Korea) for 16 weeks. Antioxidants group(G3 & G4) fed the general food and the mixed antioxidants which were consist of vitamin E(2001U/kg/day), vitamin C(50㎎/rat/day), vitamin B_6(250㎍/㎏/day), β-carotene(300㎎/㎏/day) and selenomethionine (0.1㎎/㎎/day). The weigh of each subject group was weighed 2-3 times per week. After the diet experiment for 16 weeks, exercise groups(G2 & G4) completed acute treadmill running(speed increased gradually to 25m/min, 15% uphill grade, ∼50±10min) until exhaustion. Immediately after exhaustive treadmill exercise, all the subjects were sacrificed for isolation of the heart. Then, MDA of the heart(Uchiyama and Mihara, 1978) was assayed. The protein concentration of heart was determined by the Lowry method. After finishing the analysis of oxidative damage, statistical analysis was carried out by two-way ANOVA. The results of this study can be summarized as follows: Maximal exercise increased the MDA product in the heart(p<.05), but a long-term antioxidants supplementation significantly decreased the MDA product in the heart(p<.05). In conclusion, the present results clearly show that the exhaustive maximal exercise gave rise to increase oxidative stress which led to oxidative damage so that the MDA in the heart was increased. Further, it has been found that the long-term antioxidants supplementation could decrease oxidative stress in the tissues so that the MDA in the heart was decreased.

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.

A Study on the Operation Method of Packaging System to Enhance Logistics Efficiency

정성태 한국포장학회 2018 한국포장학회지 Vol.24 No.2

This study sought efficiency of collaboration between manufacturers and distributors by finding a way to improve logistics efficiency in order to save distribution cost and standardize packaging together with profit generation by way of simple-display packaging in discount stores. For the study purpose, the impact of products with RRP (Retail Ready Packaging) by each discount store on the collaboration achievement such as loading efficiency was observed. From this observation, an alternative packaging system that can improve logistics efficiency between manufacturers and distributors was sought and the role of distributors in distribution standardization was explored. The purpose of this study also includes suggesting some implications on future basic direction of environment-friendly management. If this study would induce distributors to have more interest in distribution standardization and if logistics efficiency would be enhanced by the operation of packaging system considered of compatibility with pallets, this study would have academic significance and create practical values.