• 반도체디스플레이기술학회지
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• 제22권3호
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• pp.36-40
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• 2023

Recently, in the problem of multi-order processing in logistics warehouses, multi-pickup systems are changing from the form in which workers walk around the warehouse to the form in which goods come to workers. These changes are shortening the time to process multiple orders and increasing production. This study considered the sequence problem of which warehouse the items to be loaded on each truck come first and which items to be loaded first when loading multiple pallet-unit goods on multiple trucks in an industrial smart logistics automation warehouse. To solve this problem efficiently, we use the mutant algorithm, which combines the GA algorithm and ACO algorithm, and compare with original system.

• Journal of Korean Neurosurgical Society
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• 제30권5호
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• pp.592-599
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• 2001

Objective : The anterior communicating artery(ACoA) is known to be the most frequent location of intracranial aneurysms, but the complex arterial anatomy of the ACoA region makes this aneurysm among the most difficult one to treat. In the treatment of ACoA aneurysms, the direction of aneurysmal fundus is known to be very important in the surgical tactics. All ACoA aneurysms in our series were classified according to its direction, and analyzed the clinical features in order to investigate the prognostic factors influencing upon the surgical outcome. Methods : The authors reviewed 236 cases of ruptured ACoA aneurysms that were operated from 1990 to 1997, were classified according to Pia's classification. Results : The incidence rate of the ACoA aneurysm was 35.1%(236/672). Ventral group was more common than dorsal group, especially in ventro-caudal projection subgroup(36.0%). Poor preoperative clinical grade(Hunt-Hess grade IV and V) patients were more common in dorsal group(13.1%) than ventral group(2.6%). Rebleeding and intracerebral hematoma were more commonly seen in ventral group. However, vasospasm, hydrocephalus, hyponatremia, and intraventricular hemorrhage were observed more frequently in dorsal group. Worse outcome was more common in dorsal group than ventral group, especially in dorso-caudal projection subgroup. Also, poor outcome was identified in patients with intracerebral hematoma, intraventricular hemorrhage, hyponatremia, and hypertension, although statistically insignificant. In cases with the A1 dominancy, there was no difference in surgical outcome between the right and left side approach. The higher the aneurysmal neck from the planum sphenoidale, the worse outcome via pterional approach. Conclusion : It seems that the preoperative clinical grade, aneurysmal direction, and the height of aneurysmal neck, especially in the pterional approach, would be the major prognostic factors, and that intracerebral hematoma, intraventricular hemorrhage, hyponatremia, hydrocephalus and the intraoperative aneurysmal rupture would be the minor prognostic factors.

• Journal of Korean Neurosurgical Society
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• 제38권2호
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• pp.89-95
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• 2005

Objective : The purpose of this study is to analyze aneurysm morphology and define limitations and feasibility in endovascular Gugliemi detachable coil[GDC] embolization for anterior communicating artery [ACoA] aneurysms. Methods : From January 2000 through October 2003, 123patients were treated with endovascular coil embolization for ACoA aneurysms. There were 75women and 48men, with a mean age of 63years. All ruptured aneurysms were treated within 15days of rupture. Aneurysm morphology was classified according to neck size and projection of aneurysm dome as follows-A : neck of aneurysm <4mm & anterior projection, B : neck of aneurysm [4mm & anterior projection, C : neck of aneurysm<4mm & posterior [superior] projection, D : neck of aneurysm [4mm & posterior [superior] projection, E : neck of aneurysm<4mm & inferior projection, and F : neck of aneurysm [4mm & inferior projection. Endovascular procedures were categorized as either "successful" or "unsuccessful". Clinical follow-up was estimated at discharge and at 6months, post treatment results were classified according to Glasgow Outcome Scale[GOS]. Results : Successful embolization for ACoA was performed in 86patients of 123patients [69.9%]. Complete or near complete aneurysm occlusion was observed in 102patients [82.9%]; a neck remnant was observed in 6patients [4.9%]; partial embolization was done in 3patients [2.4%]; and embolization was attempted in 12patients [9.8%]. Among 55patients with follow-up angiographic results, 18patients [32.7%] were defined as recanalization of the aneurysm sac. Morphological analysis demonstrated that anterior projecting aneurysms and morphological classifications [morphological classifications worsens [A - D] chances of successful coil occlusion significantly decrease] were major factors in successful embolization, and, inferiorly projecting and wide neck [${\ge}4mm$] aneurysms are highly related to recanalization of aneurysms. Conclusion : Endovascular coil embolization of ACoA aneurysms shows good outcome in our study. Nevertheless, there is a limitation in the endovascular approach to ACoA, even though advanced modern techniques evolve rapidly. Compensatory surgical approach with the endovascular approach is required for successful treatment of ACoA aneurysms.

• 한국가정과교육학회지
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• 제34권2호
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• pp.95-113
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• 2022

본 연구의 목적은 2015 개정 교육과정에 따라 집필된 12종의 중학교 기술·가정 교과서에 나타난 '기후변화 대응 실천역량'을 분석하고 활동과제의 개선 방안을 제안하는 것이다. 분석 결과는 첫째, 교과서에 나타난 기후변화 대응 실천역량은 '기후변화 관련 지식'의 빈도가 가장 높았고 '기후변화 의사소통능력'이 가장 낮았다. 둘째, 12종의 모든 교과서가 기후변화대응 실천역량 중 '기후변화 관련 지식'을 가장 많이 다루고 있었고 그 외의 역량은 출판사별로 빈도에 차이가 있었으며 셋째, 기후변화 대응 실천역량은 가정교과 핵심개념 중 '관리'에서 가장 많이 다루어졌으며, '생애설계'에서는 전혀 다루어지지 않았다. 가정학 세부 학문별로는 의생활 영역이 가장 많았고, 가족생활 영역이 가장 적게 나타났다. 위의 분석 결과를 토대로 기후변화 대응 실천역량이 가정교과의 전반적 영역에서 다루어져야 함을 제안하였다. 본 연구는 가정교과의 기후변화 관련 기초 연구로서 의미가 있으며, 앞으로 가정과 교육을 통해 기후변화 행동을 실천할 수 있는 다양한 연구 및 교육 프로그램이 실행되기를 기대한다.

• 천문학회지
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• 제38권2호
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• pp.337-338
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• 2005

This is to summarize a joint discussion on the future of EAMA in EAMA6. The emphasis was placed on the near future instead of the distant future, Formation of the Working Groups as a means to carry the cooperation for the regions was generally agreed by the attendants of EAMA6 to be the best way toward the establishment of future East Asian Observatory (EAO). Association of Core Observatories (ACO) was proposed to bring resources and foster joint projects for EAMA activities.

• 기계저널
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• 제28권3호
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• pp.226-234
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• 1988

공작기계의 자동화에 적용되는 ACO, ACC 및 GAC 등에 대한 원리와 이용방안 그리고 연구개발 되어져야 할 점들에 대하여 수학적인 논술을 피하고 그 기본개념 등을 소개하였다. 궁극적인 자동화의 목표가 공작기계에 인공지능을 부여하여 경험이 없는 작업자라고 하더라도 생산공정을 관리 감독할 수 있도록 하기 위하여는 지능있는 공작기계의 개발이 이루어져야 하겠다. 지능 있는 공작기계의 개발시 고려되어져야 할 사항들을 고찰해 볼 때 공작기계의 ACO, ACC 및 GAC 등에 대한 연구개발에 앞서 절삭공정매카니즘 그 자체의 연구개발은 물론 절삭상황을 실 시간으로 측정 및 인식 할 수 있는 측정장치들에 대한 연구들이 선행되어져야 할 것이고, 선진국 대열에 들어서기 위해서는 공작기계 산업에 대한 육성은 물론 연구개발에 집중적인 투자가 이 루어져야 하겠다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2004년도 춘계학술대회 학술발표 논문집 제14권 제1호
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• pp.243-246
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• 2004

배낭 문제는 단순한 것 같지만 조합형 특성을 가진 NP-hard 문제이다 이 문제를 해결하기 위해 기존에는 GA(Genetic algorithms)를 이용하였으나 지역해에 빠질 수 있어 잘못된 해를 찾거나 찾지 못하는 문제점을 갖고 있다. 본 논문에서는 이러한 문제점들을 해결하기 위해 막대한 병렬성과 저장능력을 가진 DNA 컴퓨팅 기법에 DNA에 기반한 변형된 GA인 DNA 코딩 방법을 적용한 ACO(Algorithm for Code Optmization)를 제안한다. ACO는 배낭 문제 중 (0,1)-배낭 문제에 적용하였고, 그 결과 기존의 GA를 이용한 것 보다 초기 문제 표현에서 우수한 적합도를 생성했으며, 빠른 시간내에 우수한 해를 찾을 수 있었다.

• 전자공학회논문지CI
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• 제40권6호
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• pp.87-94
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• 2003

휴리스틱 알고리즘 연구에 있어서 중요한 분야 중 하나가 강화(Intensification)와 다양화(Diversification)의 조화를 맞추는 문제이다. 개미 집단 최적화(Ant Colony Optimization, ACO)는 최근에 제안된 조합 최적화 문제를 해결하기 위한 메타휴리스틱 탐색 방법으로, 그리디 탐색(greedy search)뿐만 아니라 긍정적 반응의 탐색을 사용한 모집단에 근거한 접근법으로 순회 판매원 문제(Traveling Salesman Problem, TSP)를 풀기 위해 처음으로 제안되었다. 본 논문에서는 ACO접근법의 하나인 개미 집단 시스템(Ant Colony System ACS)에서 강화와 다양화의 조화를 통한 성능향상기법에 대해 알아본다. 먼저 에이전트들의 방문 횟수 적용을 통한 상태전이는 탐색 영역을 넓힘으로써 에이전트들이 더욱 다양하게 탐색하게 한다. 그리고, 전역 갱신 규칙에서 전역 최적 경로만 갱신하는 전통적인 ACS알고리즘에서 대하여, 경로 사이클을 구성한 후 각 경로에 대해 긍정적 강화를 받는 엘리트 경로를 구분하는 기준을 정하고, 그 기준에 의해 추가 강화하는 방법을 제안한다. 그리고 여러 조건 하에서 TSP문제를 풀어보고 그 성능에 대해 기존의 ACS 방법과 제안된 방법을 비교 평가해, 해의 질과 문제를 해결하는 속도가 우수하다는 것을 증명한다.

• Journal of Korean Neurosurgical Society
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• 제50권2호
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• pp.81-88
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• 2011

Objective : The purpose of this study was to analyze the clinical and anatomic features involved in determining treatment modalities for anterior communicating artery (AcoA) aneurysms. Methods : The authors retrospectively evaluated 112 AcoA aneurysms with pretreatment clinical features including age, Hunt and Hess grade, medical or neurological comorbidity, and anatomical features including aneurysm size, neck size, dome-to-neck ratio, vessel incorporation, multiple lobulation, and morphologic scoring system. Post-treatment clinical results were classified according to the Glasgow Outcome Scale, and anatomic results in coiled patients were classified according to the modified Raymond scale. Using multivariate logistic regression, the probabilities for decision making between surgical clipping and coil embolization were calculated. Results : Sixty-seven patients (60%) were treated with surgical clipping and 45 patients (40%) with endovascular coil embolization. The clinical factor significantly associated with treatment decision was age (${\geq}$65 vs. <65 years) and anatomical factors including aneurysm size (small or large vs. medium), dome-to-neck ratio (<2 vs. ${\geq}$2), presence of vessel incorporation, multiple lobulation, and morphologic score (${\geq}$2 vs. <2). In multivariate analysis, older patients (age, 65 years) had significantly higher odds of being treated with coil embolization relative to clipping (adjusted OR=3.78; 95% CI, 1.39-10.3; p=0.0093) and higher morphological score patients (${\geq}$2) had a higher tendency toward surgical clipping than endovascular coil embolization (OR=0.23; 95% CI, 0.16-0.93; p=0.0039). Conclusion : The optimal decision for treating AcoA aneurysms cannot be determined by any single clinical or anatomic characteristics. All clinical and morphological features need to be considered, and a collaborative neurovascular team approach to AcoA aneurysms is essential.

• Asian-Australasian Journal of Animal Sciences
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• 제18권10호
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• pp.1451-1456
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• 2005

To study the acute effect of dietary docosahexaenoic acid (DHA, $C_{22:6}$) on the expression of adipocyte determination and differentiation-dependent factor 1 (ADD1) mRNA in pig tissues, weaned, crossbred pigs (28 d of age) were fed with either 10% (on as-fed basis) tallow (high stearic acid), soybean oil (high linoleic acid), or high DHA algal oil for 2 d. The plasma and liver DHA reflected the composition of the diet. The adipose tissue and skeletal muscle DHA did not reflect the diet in the short term feeding. The results also showed that the diet containing 10% algal DHA oil significantly decreased the total plasma cholesterol (39%) and triacylglycerol (TG; 46%) in the pigs. Soybean oil significantly decreased plasma TG (13.7%; p<0.05), but did not have an effect on plasma cholesterol. The data indicate that different dietary fatty acid compositions have different effects on plasma lipids. The ADD1 mRNA was decreased (p<0.05) in the liver of DHA oil-treated pigs compared with the tallow-treated pigs. The diets did not have significant effect on the ADD1 mRNA in adipose tissue. Addition of algal DHA oil in the diet increased acyl CoA oxidase (ACO) mRNA concentration in the liver, suggesting that dietary DHA treatment increases peroxisomal fatty acid oxidation in the liver. However, dietary soybean oil supplementation did not affect mRNA concentrations of ADD1 or ACO in the tissues of pigs. Because ADD1 increases the expression of genes associated with lipogenesis, and ACO is able to promote fatty acid oxidation, feeding DHA oil may change the utilization of fatty acids through changing the expression of ADD1 and ACO. Therefore, feeding pigs with high DHA may lead to lower body fat deposition.