• 한국기계가공학회지
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• 제16권2호
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• pp.44-49
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• 2017

In this study, the cutting conditions of moving speed, number of main axial revolutions, etc. are changed for the chrome molybdenum steel (SCM415) material and carbide ball end mill tool to study the changes for processing intensity in the cutting process. The results that confirm the intensity of the measured value of the specimen for SCM415 display the intensity with an average 1.0667 HrC. After the fact cutter, it was able to confirm the average intensity of 8.3815 HrC. In addition, the intensity value after image processing may determine the average intensity survey value of 5.8690 HrC and the different intensity values with image processing after face cutting are shown for an average of ${\pm}2.5125HrC$. The different value of intensity with the specimen and image processing is confirmed for an average of 4.8024 HrC. The results of comparing the intensity following the number of main axial revolutions and moving speed show that the intensity is highest for 3,000 rpm and F200, and lowest for 4,000 rpm and F200.

• Journal of Forest and Environmental Science
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• 제20권1호
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• pp.40-50
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• 2004

이 연구는 강원대학교 학술림내 천연활엽수림을 대상으로 적절한 보육 벌채 시업 방안을 마련하기 위하여 임목의 형질을 평가하고, 형질에 따라 불량한 임목들을 제거하는 벌채 시업 방안을 제시함으로서, 임목형질 평가 방법을 이용한 천연활엽수림의 개선별 시업 적용을 예측하기 위하여 실시되었다. 연구대상 임분의 평균 ha당 본수는 717 본이었으며, 평균직경은 21.1cm, 평균수고는 13.6m로 파악되었다. 상층에는 졸참나무, 굴참나무, 신갈나무, 쪽동백나무, 느릅나무 등의 순으로 우점도가 높은 것으로 나타났다. 4가지의 임목 형질별로 등급을 부여하고, 등급별로 보육 별채를 할 경우마다 단위면적당 임목수, 직경, 수고의 변화를 추정하였다. 형질 등급을 높여서 벌채할수록 임목 본수는 감소하나 임목 형질이 향상되는 효과를 보일 것으로 예상되었다.

• 한국잡초학회지
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• 제6권1호
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• pp.18-24
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• 1986

생장조절제(生長調節劑)가 너도방동사니의 생육(生育) 및 괴경형성(塊莖形成)에 미치는 영향(影響)과 경엽절단(莖葉切斷)의 효과(效果)를 구명하여 얻어진 결과(結果)는 다음과 같다. 1. BA의 경엽처리시(莖葉處理時) 너도방동사니의 괴경수(塊莖數)와 괴경(塊莖)의 생체중(生體重)은 무처리(無處理)에 비(比)해서 각각(各各), 평균(平均) 24,7%와 32.4%로 현저(顯著)히 증가(增加)했으나 ABA 및 GA를 단독(單獨) 처리(處理)한 경우(境遇), 대체(大體)로 억제(抑制)되는 경향(傾向)이었다. 2. BA $10^{-4}$M 처리(處理)와 BA $10^{-5}$M과 GA $10^{-5}$M의 혼합처리(混合處理)에서 괴경수(塊莖數)는 무처리(無處理)에 비(比)해 각각(各各), 31.8%와 53.7%로 증가(增加)했으나 GA $10^{-5}$M 처리(處理)에서는 21.9%의 감소(減少)를 보였다. 3. 질소수준별(窒素水準別) BA의 처리효과(處理效果)를 보면, 질소시용(窒素施用)이 15kg/10a 수준(水準)에서 괴경수(塊莖數)는 BA의 농도(濃度)를 평균(平均)하여 무처리(無處理)보다 24.7% 증가(增加)되었다. 4. 생장조절제(生長調節劑)가 너동방동사니의 개화(開花)에 미치는 영향(影響)을 보면, GA 처리구(無處理區)만이 무처리구(無處理區)보다 평균(平均) 4.8% 증가(增加)를 나타냈다. 5. 절단회수(切斷回數)의 증가(增加)는 너도방동사니의 괴경수(塊莖數) 및 괴경(塊莖)의 생체중(生體中)을 현저(顯著)히 감소(減少)시켰으며 3회(回) 절단(切斷)의 경우(境遇), 질소수준(窒素水準) 15kg/10a에서 괴경수(塊莖數)는 무처리(無處理)보다 76.1% 감소(減少)되었다.

• 정신신체의학
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• 제28권2호
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• pp.161-167
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• 2020

연구목적 자살행동의 계절성은 잘 알려져 있는 현상이지만, 자해행동의 계절성은 알려진 바가 적다. 본 연구는 자해행동 중 하나인 손목자해행동이 계절성을 나타내는지를 확인하고, 기후인자와의 관련성을 파악하고자 했다. 방 법 자해행동의 계절성을 확인하기 위하여 2014. 12~2019. 5까지 일 병원 응급실에 손목자해행동으로 내원한 226명의 대상자의 월별 평균 내원 숫자가 월별로 차이를 나타내는지를 보았다. 손목자해행동과 기후인자와의 관련성을 확인하기 위하여 월 단위 시간변수와 기상청 데이터를 통해 획득한 월별 기후변수(기온, 일조량, 1개월 전 대기압)를 설명변수로 하고, 월 별로 손목자해행동으로 응급실에 내원한 횟수를 결과변수로 하여 일반화 가법모형을 이용한 다중 포아송 회귀분석을 실시하였다. 결 과 손목자해행동으로 응급실에 내원한 대상자의 월 평균 숫자는 남자에서 유의한 월별 차이가 있었고, 9월에 가장 많았다(남자 : p=0.048, 여자 : p=0.21, 전체 : p=0.28). 다중 회귀분석 결과 손목자해로 응급실에 내원한 월 평균 환자의 숫자는 남자에서는 1달전 대기압과 기온의 교호작용과 관련이 있었고(p=0.010), 여자에서는 일조량과 양의 상관관계[p=0.044, β=4.70×10-3, 95% CI=(1.19×10-4, 9.27×10-3)]를 보였다. 결 론 손목자해행동은 남성에서 두드러진 계절성을 보이며, 이는 기후변수의 변화와 관련성이 있다.

• 한국CDE학회논문집
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• 제2권1호
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• pp.19-27
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• 1997

This paper presents rough cut tool path planning for the fewer-axis machine consisting of a three-axis CNC machine and a rotary indexing table. In the problem dealt with in this paper, the tool orientation is "intermediately" changed, distinguished from the conventional problem where the tool orientation is assumed to be fixed. The developed rough cut path planning algorithm tries to minimize the number of tool orientation (setup) changes together with tool changes and the machining time for the rough cut by the four procedures: a) decomposition of the machining area based on the possibility of tool interference (via convex hull operation), b) determination of the optimal tool size and orientation (via network graph theory and branch-and bound algorithm), c) generation of tool path for the tool and orientation (based on zig-zag pattern), and d) feedrate adjustment to maintain the cutting force at an operation level (based on average cutting force). The developed algorithms are validated via computer simulations, and can be also used in pure fiveaxis machining environment without modification.

• 한국환경복원기술학회지
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• 제10권6호
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• pp.130-138
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• 2007

To protect the surface of ground-cutting slopes occurring at the national road substitute detour [roundabout road]construction jobsite between Munduk and Wubokgu within the jurisdiction of Pohang-si and environment-friendly road construction, a test execution of re-vegetation measures on the major slopes was done and the results are as follows : As a result of finding out the number of sprouting individuals on the test construction site, the average number of sprouting individuals on the three test spots by the method of revegetation measures D, revegetation measures A, and revegetation measures B was 1,292 number of per square meter, 1,190 number of per square meter, and 1,095 number of per square meter respectively, which statistics were higher than those of test spot by the revegetation measures C. As a result of finding out living plant's breeding index [weight in dried state], the average dried weight of living plant at the test spot by the method of revegetation measures B, in case of foreign herbal species, was the highest marking 8.96 grams per square meter, and the next was 6.86grams per square meter by the method of revegetation measures D, and the next after was 6.80 grams per square meter by the method of revegetation measures A, and the last 5.93 grams per square meter by the method of revegetation measures C. As a result of finding out the covering degree on the slopes, the same average covering degree of 80% and 77.5% in revegetation measures A and revegetation measures D individually, which showed a somewhat higher covering degree than those of revegetation measures B and revegetation measures C. As a result of finding out appearing plants on the test construction site, seeding plant life was found to be sprouting on all test spot while native and foreign herbal species and herbaceous plant as well as shrubs were growing in good harmony with each other. However, in case of revegetation measures B and revegetation measures C method, foreign plant species are dominantly growing. As a result of inspecting rifts on the slopes and the excavated state by water, there existed cracks in some of base materials only in revegetation measures C method applied spot.

• 한국생산제조학회지
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• 제18권6호
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• pp.629-635
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• 2009

In this research, KP-4, one of the plastic mold steels, was coated with the AlTiN from one layer to four layers by the PVD method in the $\Phi$ 8mm cemented carbide ball end mill. Coated KP-4 was processed with various conditions. For example, slope of $15^{\circ}$, $30^{\circ}$ and $45^{\circ}$ the spindle rotation speed was changed from 10,000rpm to 16,000rpm, the tool feeding speed was changed from 1,300mm/min to 1,700mm/min, the depth of cut was also changed from 0.3mm to 0.9mm, and etc. Cutting component force according to the coating layer number, and surface roughness were studied. The cutting component force showed a good agreement better the up ward direction than the down ward direction under all experimental conditions. In case of the condition per the material shape, it was lessen when the tool have larger angle because the average effective diameter of the tool is larger. The surface roughness showed good condition in case of the up ward than the down ward direction. And, in the 3rd layer of AlTiN coating, it showed the most suitable condition.

• 한국의류산업학회지
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• 제16권3호
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• pp.421-433
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• 2014

The aim of this study was to provide compression wear manufacture brands with information needed for product development. 8 tops and 7 bottoms from widely recognized compression wear manufacture brands were selected, and their product structural elements were analyzed, too. The results showed that most compression wear designs were applications of cutting lines designed considering muscle movements of the human body. The average number of cutting lines for patterns and designs were 14 for tops and 15 for bottoms. Different colored material was mainly used on the top for areas that require ventilation or high movement during sports for tops, and for areas that require muscle and joint support during sports for bottoms. The functionality of top materials were found to be stretch, muscle support, moisture absorption and high speed drying, warmth and ventilation for tops, in order of frequency, and stretch, muscle support, moisture absorption and high speed drying, and pressure for bottoms, in order of frequency. Tops were cut in the direction of the lengthwise grain, and bottoms were not only cut in the direction of the lengthwise grain, but also in the direction of the crosswise grain and bias for many products. Tops consisted of an average of 13 organically connected panels, and bottoms consisted of an average of 18 organically connected panels, which was analyzed to improve functionality. The average clothing surface area stretch rate was 85.7% for tops and 70.0% for bottoms, indicating that bottoms were designed to have higher strain rates compared to tops.

• 한국초지조사료학회지
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• 제11권2호
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• pp.90-96
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• 1991

This experiment was carried out in order to estimate the recovery days of root and stubble to the days after cutting, and contribution of specific stubble weight on the regrowth was examined using the relationships between the dry weight of shoot and yield components, and regrowth parameters by the days after cutting. The varieties examined were Maprima, Manhattan, Tove, Peramo, Caliente, Tempo and P-2 grown under individual plant basis. The results are may be summarized as follows: 1. Dry weight of root and stubble were recovered up to 13.5 and 11 days after cutting, respectively. 2. Dry weight of shoot(regrowth parts+stubble) was affected significantly by the varieties, stages of regrowth and variety x stage of regrowth. 3. The variety with tiller weight type showed higher average productivity of shoot than those of the variety with tiller number type. 4. Absolute growth rate(AGR) of shoot was correlated significantly with regrowth parts, stubble, root and weight of a tiller at the early stage of regrowth(up to 12 days after cutting), and correlated with regrowth parts, stubble, weight of tiller and stubble area at the late stage of regrowth(up to 20 days after cutting). 5. Contribution of specific stubble weight to absolute growth rate of shoot was different between the stages of regrowth. Thus, regrowth parts per specific stubble weight(RP1SSbW) and weight of tiller per specific stubble weight(WT1SSbW) contributed to absolute growth rate of shoot at the early stage of regrowth, and efficiency of specific stubble weight(ESSbW), regrowth parts per specific stubble weight (RPISSbW) and weight of a tiller per specific stubble weight(WT1SSbW) contributed to absolute growth rate of shoot at the late stage of regrowth. 6. Regrowth utilization rate(RUR) was one of the useful regrowth parameter to indicate the regrowth potential of grasses.

• 한국정보과학회논문지:정보통신
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• 제35권6호
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• pp.497-509
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• 2008

현재 패킷 분류에 대한 다양한 알고리즘들이 연구되어 오고 있다 그 중 HiCuts와 HyperCuts와 같은 디시젼(decision) 트리에 기초한 패킷 분류 알고리즘은 룰의 각 필드가 가지는 영역에 따른 기하학적 구조를 이용한 방법으로 잘 알려져 있다. 그러나 이 알고리즘들은 분할(cutting)을 수행할 필드(Field)를 선택하거나 디시젼 트리의 각 노드에서 컷(cut)의 수를 결정해야 하는 등의 비교적 복잡한 작업을 요구하므로 현실적으로 구현하기 어려운 점을 가진다. 또한 각 룰이 차지하는 영역의 특성을 고려하지 않고 일정한 크기의 영역으로 커팅이 이루어지므로 효과적인 커팅을 하지 못하는 단점이 있다. 본 논문에서는 새로운 영역 분할을 사용한 효과적인 패킷 분류 알고리즘을 제안한다. 제안하는 알고리즘은 먼저 프리픽스를 가지는 두 필드를 이용하여 각 룰이 차지하는 영역들을 찾아내 이들을 이용해 영역분할을 수행한다. 따라서 제안된 알고리즘은 보다 효율적인 디시젼 트리를 구성한다. 즉, 디시젼 트리의 각 노드에서는 HiCuts이나 HyperCuts와 같은 복잡한 작업없이 최적화된 커팅을 수행할 수 있다. 클래스 벤치에서 제공된 데이타베이스에 대하여 시뮬레이션을 수행한 결과, 제안된 알고리즘은 평균 검색 속도에서 기존의 알고리즘들보다 훨씬 향상되었고 메모리 요구량에서는 기존의 커팅 알고리즘과 비교하여 대략 $3{\sim}300$배까지 크게 줄어드는 효과를 보였다.