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.

하계 실내 및 실외환경의 공기 중 휘발성 유기화합물 농도 및 개인노출

양원호,손부순,박종안,장봉기,박완모,김윤신,어수미,윤중섭,류인철 한국환경과학회 2003 한국환경과학회지 Vol.12 No.9

Volatile organic compounds (VOCs) are present in essentially all natural and synthetic materials from petrol to flowers. In this study, indoor and outdoor VOCs concentrations of houses, offices and internet-cafes were measured and compared simultaneously with personal exposures of each 50 participants in Asan and Seoul, respectively. Also, factors that influence personal VOCs exposure were statistically analyzed using questionnaires in relation to house characteristics, time activities, and health effects. All VOCs concentrations were measured by OVM passive samplers (3M) and analyzed with GC/MS. Target pollutants among VOCs were Toluene, o-Xylene, m/p-Xylene, Ethylbenzene, MIBK, n-Octane, Styrene, Trichloroethylene, and 1,2-Dichlorobenzene. Indoor and outdoor VOCs concentrations measured in Seoul were significantly higher than those in Asan except Ethylbenzene. Residential indoor/outdoor (I/O) ratios for all target compounds ranged from 0.94 to 1.51 and I/O ratios of Asan were a little higher than those of Seoul. Relationship between personal VOCs exposure, and indoor and outdoor VOCs concentrations suggested that time-activity pattern could affect the high exposure to air pollutant. Factors that influence indoor VOCs level and personal exposure with regard to house characteristics in houses were building age, inside smoking and house type. In addition insecticide and cosmetics interestingly affected the VOCs personal exposure. Higher exposure to VOCs might be caused to be exciting increase and memory reduction, considering the relationship between measured VOCs concentrations and questionnaire (p<0.05).

복강 내 체액의 Cytokine 농도를 이용한 난소암과 양성난소질환의 감별진단

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

活性炭 生物膜 工法에서 Cr(Ⅵ) 溶解 廢水 處理

양영철,장성호,성낙창,김수생,김철 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.1

This study has been carried out to provide the basic data then biofilm with activated carbon was used for (Cr(Ⅵ)-containing wastewater treatment. The results from this study are follows; 1. Substrate removal rate constants were 0.451∼0.861 at A reactor, 0.462∼0.899 at B reactor and 0.418∼1.033 at C reactor. 2. CR(Ⅵ) removal efficiencies with dosage of CR(Ⅵ) indicated below 40% when CR(Ⅵ) dosage was over 10㎎/l at A and B reactor, and over 20㎎/l at C reactor, no relation with volume loading rate. 3. COD removal efficiencies with dosage of CR(Ⅵ) were changed when CR(Ⅵ) dosage was 10㎎/l in case of 1.6, 3.2㎏·COD/m³day at A reactor, was 20㎎/l in case of 1.6, 3.2㎏·COD/m³·day at B reactor, was 25㎎/l in case of 1.6, 3.2㎏·COD/m³·day at C reactor. 4. NH₄^(+) -N removal efficiencies with dosage of CR(Ⅵ) were changed when CR(Ⅵ) dosage was 1㎎/l, 10㎎/l at A, B reactor, not related with volume rate, was 20㎎/l in case of 3.2, 4.8㎏·COD/m³·day at C reactor.

Cu-Al-Ni계 형상기억리본의 결정립크기 및 미세조직에 미치는 휠 회전속도의 영향

이영수,이수홍,장우양,강조원 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1

To improve mechanical properties of Cu-Al-Ni alloy by the grain refinement, Cu-Al-Ni SMA ribbons were fabricated by melt spinning apparatus. The variations of microstructure, transformation characteristics and mechanical properties with wheel speed were investigated in Cu-Al-Ni SMA ribbons. The ribbons fabricated by melt spinning obtained around 1.5mm in width and 50∼60㎛ in thickness. With increasing wheel speed in order of 10m/s, 15m/s, 20m/s, 30m/s and 35m/s, the grain size was decreased in order of 10㎛, 6㎛, 5㎛, 3㎛ and 3㎛. M_(s) and A, temperatures were decreased with decreasing grain size By X-ray diffraction test, ordered β_1 phase was observed in all the SMA ribbons and the volume friction of it was increased with increasing wheel speed. With increasing wheel speed, strain was increased from 4.8% to 5.8% and fracture mode has changed from mixture of intergranular and dimple fracture to mixture of fiber structure and dimple fracture

전산화단층영상에서 절치관 및 순측 치조골 폭경에 관한 연구

노양균,장현선,김병옥,김진수 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.3

Purpose : To assess the width of the labial alveolar bone of the incisive canal and the width of the incisive canal on spiral computed tomographic images of the anterior portion of the maxilla. Materials and Methods : Study materials included 38 CT scans taken for preoperative planning of implant placement. Axial cross-sectioned image entirely showing the incisive canal was selected and scanned with 600 DPI resolution. The width of the labial alveolar bone of the incisive canal at an orifice to the oral cavity, middle portion, and an orifice to the nasal cavity and the diameter of the incisive canal at the middle portion were determined by two specialist using Digora for Windows 2.1. The statistical analyses were carried out using SPSS 12.0.1. Results : When the maxillary central incisors remained, the mean labial alveolar bone width were 6.81±1.41 mm, 6.46±1.33 mm, and 7.91±1.33 mm. When the maxillary central incisors were missed the mean width were 5.42±2.20 mm, 6.23±29 mm, and 7.89±2.13 mm. Conclusions : The labial alveolar bone width at middle portion and an orifice to the nasal cavity were of no statistical significant difference according to presence of the maxillary central incisors (P>0.05). The width between oral cavity and nasal cavity, middle portion and to nasal cavity revealed statistically significant difference (P<0.05).

당뇨병을 가진 LUDWIG'S ANGINA 환자에 대한 치험례: 증례보고

류수장,양영철 大韓顎顔面成形再建外科學會 1997 Maxillofacial Plastic Reconstructive Surgery Vol.19 No.3

Ludwig's angina has been defined as a potentially lethal, rapidly spreading cellulitis, involving the sublingual and submandibular spaces, and is manifesed by a brawny, suprahyoid induration, tender swelling in the floor of mouth, elevation and posterior displacement of tongue. This paper is of interest not only because of severity of infection but also because of associated diabetic mellitus. Diabetes mellitus is a complex syndrome of disordered metabolism and elevated blood glucose, it results from deficiency of insulin secretion of combination of insulin resistance and inadequate insulin secretion. The effects of diabetic mellitus include neuropathy, vascular insufficiency, decreased leukocytic function, hematologic change etc. Clinically this may be refelected by the increased severity of infections seen in diabetics. The treatment of infections in diabetics are reduction of number of microbes through the use of appropriated antimicrobial agents and proper surgical drainage and improvement of the host factors by tight control of insulin replacement and immediate intervention to correct abnormalities of the local factors by drainage, debriment, and removal of avoidance of foreign bodies. The authors present the report of the Ludwig's angina in patient with diabetic mellitus, with literature review and good clinical result.

안면골 골절로 인한 시신경 손상

김종배,양영철,류수장 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.4

Optic nerve injury serious enough to result in blindness had been reported to occur in 3% of facial fractures. When blindness is immediate and complete, the prognosis for even partial recovery is poor. Progressive or incomplete visual loss may be ameliorated either by large dosage of steroid or by emergency optic nerve decompression, depending on the mechanism of injury, the degree of trauma to the optic canal, and the period of time that elapses between injury and medical intervention. We often miss initial assessment of visual function in management of facial fracture patients due to loss of consciousness, periorbital swelling and emergency situations. Delayed treatment of injuried optic nerve cause permanent blindness due to irreversible change of optic nerve. But by treating posttraumatic optic nerve injuries aggressively, usable vision can preserved in a number of patients. The following report concerns three who suffered visual loss due to optic nerve injury with no improvement after steroid therapy and/or optic nerve decompression surgery.

지문 융선의 방향성 특징추출을 위한 영상 처리

김은영,양영수,강진석,김장형,최연성 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2

In this paper, it was presented that broadly delivered scanner devices can also used in fingerprint recognition process and then modified existing steps of fingerprint image processing. First, using the adaptive binary method, that effect was certified already, increased the effect of the results. And then, applying table mapping methods that looks for elements from look-up table, decreased the processing time, too. Finally, it was presented that ridge-direction characteristics extracted from these processes can used effectively in the area of fingerprint recognition system.

Haemophilus aphrophilus 심내막염 1예

차충환,신희봉,장성수,김민경,김양수,송재관,김미나 대한임상미샐물학회 2003 Annals of clinical microbiology Vol.6 No.2