• Journal of Biosystems Engineering
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• 제28권5호
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• pp.449-456
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• 2003

A robot system was developed to pick desired colony. This robot system consisted of an image acquisition process which acquires the image information of colony, an illumination device which irradiates the object once when it gets the image of it, a picking head, a replicating head, a bed for fixing well-plates, and a sterilization device of sterilizing pin stained with colony. Picking pins were washed in an ultrasonic wave washing for takes ten seconds. Picking pins were dipped for sterilizing in alcohol for ten seconds. The time for resterilizing picking pins in a heater was five seconds. This performance test resulted 100% success rate for both the colony picking and the colony replication process. Considering the procedure in which 8 pins were smeared by colony, picked on a well plate, and sterilized as one cycle, the system could carry out one cycle in 110 seconds. It took about 138 minutes to pick around 600 colonies.

• Journal of Biosystems Engineering
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• 제41권1호
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• pp.12-20
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• 2016

Purpose: Pepper prices have risen continuously because of a decrease in cultivation area; therefore, mechanical harvesting systems for peppers should be developed to reduce cost, time, and labor during harvest. In this study, a screw type picking head for a self-propelled pepper harvester was developed, and the optimal working conditions were evaluated considering helix types, winding directions of helix, and rotational speeds of the helix. Methods: The screw type was selected for the picking head after analyzing previous studies, and the device consisted of helices and a feed chain mechanism for conveying pepper branches. A double helix and a triple helix were manufactured, and rotational speeds of 200, 300, and 400 rpm were tested. The device was controlled by a variable speed (VS) motor and an inverter. Both the forward and reverse directions were tested for the winding and rotating directions of the helix. An experiment crop (cultivar: Longgreenmat) was cultivated in a plastic greenhouse. The test results were analyzed using the SAS program with ANOVA to examine the relationship between each factor and the performance of the picking head. Results: The results of the double and triple helix tests in the reverse direction showed gross harvest efficiency levels of 60-95%, mechanical damage rates of 8-20%, and net marketable portion rates of 50-80%. The dividing ratio was highest at a rotational speed of 400 rpm. Gross harvest efficiency was influenced by the types of helix and rotational speed. Net marketable portion was influenced by rotational speed but not influenced by the type of helix. Mechanical damage was not influenced by the type of helix or rotational speed. Conclusions: Best gross harvest efficiency was obtained at a rotational speed of 400 rpm; however, operating the device at that speed resulted in vibration, which should be reduced.

• 한국생산제조학회지
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• 제21권3호
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• pp.401-407
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• 2012

The recent manufacturing process in the thin wafers and flat panel necessitate new approaches to reduce handling fragile and surface-sensitive damage of components. This paper presents a new pneumatic levitation for non-contact handling of parts and substrates. This levitation can achieve non-contact handling by blowing air into an air pressure pick-up head with radial passages to generate a negative pressure region. Negative pressure is caused by the radial air flow by nozzle throat and through holes connecting to the bottom region. The numerical analysis deals with the levitational motion with different design factors. The dynamic motion is examined in terms of force balance(dynamic equilibrium) occurring to the flow field between two objects. The stable equilibrium position and the safe separation distance are determined by analyzing the local pressure distribution in the fluid motion. They make considerable design factors consisting the air pressure pick-up head. As a result, in case that the safe separation distance is beyond 0.7mm, the proposed pick-up head can levitate stably at the equilibrium position. Furthermore, it can provide little effect of torque, and obtain more wide picking region according to the head size.

• 산업경영시스템학회지
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• 제28권3호
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• pp.109-114
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• 2005

The founding purpose of Business Incubation System is to induce those businessmen who have technology and promising business ideas but are lacking fund, information, and management skill, and to speed up their business establishment and enhance the level of success by providing them with managerial knowledge, production technology, design, and equipment. While some universities made Business Incubation Center to achieve the above purpose, some other universities, especially the local ones, believed that Business Incubation Center, if managed successfully, could be an accelerator picking up the sluggish local economies. This study studied the motivators that let them move in an Incubating Center, their request for support, their level of expert utilization, and the role of head of a Center. This study found a significant level of correlation among the variables such as industrial-educational cooperation, the development of common items, utilization of professors with matching majors, utilization of research professors, and transfer of technology.

• Smart Structures and Systems
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• 제6권5_6호
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• pp.561-578
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• 2010

This study proposes a multi-level damage localization strategy to achieve an effective damage detection system for civil infrastructure systems based on wireless sensors. The proposed system is designed for use of distributed computation in a wireless sensor network (WSN). Modal identification is achieved using the frequency-domain decomposition (FDD) method and the peak-picking technique. The ASH (angle-between-string-and-horizon) and AS (axial strain) flexibility-based methods are employed for identifying and localizing damage. Fundamentally, the multi-level damage localization strategy does not activate all of the sensor nodes in the network at once. Instead, relatively few sensors are used to perform coarse-grained damage localization; if damage is detected, only those sensors in the potentially damaged regions are incrementally added to the network to perform finer-grained damage localization. In this way, many nodes are able to remain asleep for part or all of the multi-level interrogations, and thus the total energy cost is reduced considerably. In addition, a novel distributed computing strategy is also proposed to reduce the energy consumed in a sensor node, which distributes modal identification and damage detection tasks across a WSN and only allows small amount of useful intermediate results to be transmitted wirelessly. Computations are first performed on each leaf node independently, and the aggregated information is transmitted to one cluster head in each cluster. A second stage of computations are performed on each cluster head, and the identified operational deflection shapes and natural frequencies are transmitted to the base station of the WSN. The damage indicators are extracted at the base station. The proposed strategy yields a WSN-based SHM system which can effectively and automatically identify and localize damage, and is efficient in energy usage. The proposed strategy is validated using two illustrative numerical simulations and experimental validation is performed using a cantilevered beam.

• 대한미생물학회지
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• 제11권1호
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• pp.79-85
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• 1976

There are many of anaerobic culture methods and equipments for isolation and cultivation of anaerabic bacteria, but most of these methods are used without pre-reduced media. Gas-jet method is a recommend. able method for the culture of anaerobes, resently developed. Bacteriological studies were experimented of liver abscess of cattle by the use of gas. jet method. The results were summarised as follows; 1. Gas-jet method for anaerobic culture are expedient for the making of pre-reduced media, maintaining of oxygen free condition in the culture tube, picking of bacteria from colony and colony counting etc. 2. A 121 strains of facultative anaerobic and anaerobic bacteria were isolated from liver abscess of 27 head of cattle, and the isolated anaerobic bacteria were as follows. Peptostreptococcus spp. 7 strains Acid aminococcus fermentans 1 Veillonella spp. 1 Bacterioides spp. 6 Bifidobacterium spp. 4 Arachinia propionica 2 Lactobacillus spp. 4 Propionibacterium acnes 1 3. Liver abscess were infected with many of bacteria, about $10^3-10^9$ numbers per gram of abcessed tissue. Almost of abscess were mixed infection of various bacterial species rather than simple species.

• 대한소아치과학회지
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• 제30권3호
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• pp.341-347
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• 2003

Smith-Magenis syndrome(이하 SMS)은 제 17번 상염색체의 부분적 결손으로 발생하는 다발성 선천적 기형 및 정신지체를 특징으로 하는 증후군으로 1 : 25,000의 빈도로 발생하는 것으로 알려져 있다. 이 증후군은 작은 키와 단두증(brachycephaly)을 동반한 편평한 중안면, 처진 입, 종종 두드러지게 붉은 뺨, 성인에서 돌출된 턱 등의 특징적인 얼굴 생김새, 만성이염, 청각 손상, 사시와 근시를 포함한 눈의 이상, 목 쉰 소리, 짧은 손가락과 발가락, 심장 질환, 비뇨기 질환, 척추 만곡, 비정상적 걸음걸이, 통각에 둔감함 등의 신체적 특징을 지닌다. 특히 유아기에는 토실토실한 아기 얼굴, 행복한 기분, 드문 울음소리, 낮은 근 긴장도, 섭식 장애 등의 특징이 있다. 수면 장애를 포함하여 언어 지체 및 발음 장애, 발달지체, 학습 장애, 정신지체, 활동항진과 자해, 폭발적 분노, 지속되는 짜증, 파괴적이고 공격적인 행동, 흥분성, 흥분시에 팔로 안거나 손을 끼우는 행동 등의 행동 발달적 특징을 나타낸다. 본 증례는 3세 3개월된 남아로 생후 10개월에 SMS를 진단받은 환자로 상악 좌측 제 1유구치의 통증을 주소로 본과에 내원하였으며, 임상 및 방사선학적으로 다발성 우식증을 보였으며, 소아과 주치의에게 의뢰한 결과 심내막염의 예방을 위한 항생제의 처치를 처방 받고, 환아의 행동 발달적 문제로 인해 물리적 속박의 방법 하에 외래에서 치료되었다. 이 증례를 통해 SMS라는 희귀한 증후군에 관하여 보고하고자 한다.

• 한국임상수의학회지
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• 제23권2호
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• pp.183-185
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• 2006

동일 새장에서 함께 사육되는 네 마리의 비둘기가 두부, 경부, 겸부의 심한 탈모, 소양감, 그리고 발적을 주 증상으로 하여 내원하였다. 이들은 약간의 움직임 저하를 보였으나, 식욕은 정상이었다. 경부 깃털 부분의 피부 소파 검사(scraping examination)상에서 외부 기생충 감염이 확인되었다. 외부 기생충은 형태학적 검사 상에서 진드기로 진단되었으며, 총 백혈구 검사(CBC)에서, 호산구 증가가 현저하게 나타났다. 비둘기에게는 ivermectin (200 mcg/kg 국소적으로 2주마다 2회 적용, 스프레이 1회 적용)이 적용되었다. 임상 증상은 첫 처치 후 45일이 지나 현저히 호전되었다. 이번 임상 증례 보고서에서는, 새의 진드기 감염인 경우에는 피부의 심한 탈모, 소양감, 그리고 전신적인 발적 등의 임상 증상 및 행동상의 문제가 나타나며 이에 대한 처치로는 ivermectin의 국소적인 처치가 유용하다는 것을 보여준다.

• 동양고전연구
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• 제54호
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• pp.289-318
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• 2014

이 연구는 "무예도보통지"의 권법을 종합적인 관점에서 해석하는 것이다. 권법에 대한 인용서목 분석과 "기효신서", "무예제보번역속집", "무비지"의 권법 자세를 비교하는 목적이 있다. 문헌고찰을 통해 얻은 결론은 다음과 같다. 첫째, "무예도보통지" 권법의 인용서목을 검토한 결과, 중국문헌 14개, 한국문헌 2개 등 총 16개로 나타났다. 일본의 문헌은 권법 내용에 실리지 않았다. 중국의 대표적인 문헌으로는 "한서", "기효신서", "무비지" 등이었고, 한국의 대표적인 문헌으로는 "무예제보번역속집" 이었다. 둘째, 중국의 "기효신서", "무비지", 한국의 "무예제보번역속집", "무예도보통지" 등 4개의 문헌을 통해 나타난 동일한 자세는 현각허이세, 기고세, 안시측신세, 염주세, 포가세 등이었다. "기효신서"를 제외한 3개의 문헌에서는 정란, 귀축각, 지당세, 수두세, 신권, 일조편, 작지룡, 조양수 등 8개의 동일한 자세가 나타났다. "무비지"와 "무예도보통지"의 문헌에서만 보이는 동일한 자세로는 나찰의출문가자변하세, 금계독립세였다. 셋째, 권법 자세를 비교한 결과, 무엇보다 한국의 "무예제보번역속집"에서는 축천과 응쇄익이라는 독특한 자세가 나타났고, "무예도보통지"에서는 오화전신세와 갑을상부라는 독특한 동작이 나타났다. 문헌 연대로는 "기효신서"가 가장 빠르지만 기술특성을 고려할 때 "무예제보번역속집"과 "무예도보통지"에서 자세에 대한 변화가 점차 생기기 시작하였고, 무엇보다 조선 시대상에 맞는 독특한 자세들이 개발되기 시작하였다고 볼 수 있다. 종합적으로, "무예도보통지"의 권법은 "한서", "기효신서", "무비지"의 중국 문헌과 "무예제보번역속집"의 한국 문헌을 참고해서 집필되었다. 권법의 자세는 중국의 "기효신서", "무비지", 한국의 "무예제보번역속집", "무예도보통지"에서 5개의 동일한 동작 외에 다른 동작들은 점차 변화하였고, "무예제보번역속집"부터 8가지의 새로운 자세가 나타나기 시작하였고, 축천세와 응쇄익세의 2개 동작은 "무예제보번역속집"에만 나타났다. 특히 우리나라 권법은 축천세와 응쇄익세, 갑을상부, 오화전신세는 중국문헌의 권법 관련내용에서는 찾아볼 수 없는 새로운 기술들을 개발함으로써 점차 우리나라 실정에 맞게 변화를 꾀하였음을 알 수 있다. 이 연구의 의의는 조선시대 권법의 무술사적 의미를 해석하고 오늘날 맨손무예로 각광받고 있는 태권도의 전통주의적 관점에서 역사해석의 토대마련을 위한 징검다리를 놓았다는 점이다. 후속연구에서는 "무예도보통지"와 태권도의 기술에 대한 차이와 유사성 분석을 통해 태권도와 권법 사이에 관련성을 확인할 것이다.