무선네트워크 제어 시스템의 최신 연구동향

유준혁 대구대학교 정보통신연구소 2012 情報通信硏究 Vol.9 No.1

본 논문은 무선 네트워크 제어 시스템(Wireless Networked Control System)의 최신 연구동향을 제시한다. 일반적으로 유선 네트워크 제어 시스템(Networked Control System)에서 극복하지 못한 다양한 문제점들을 간단하게 해결할 수 있어, 무선 네트워크 기반의 제어 시스템을 선호하는 추세이며 이러한 많은 장점들이 있지만 개선해야할 문제점도 많다. 본 논문에서는 보완해야 할 다양한 문제점을 극복하기 위해 관련된 연구가 이루어지고 있는 동향을 제시한다.

문학교재 읽기와 쓰기의 통합적 지도 방안

권혁준 한국교원대학교 한국어문교육연구소 1997 한국어문교육 Vol.6 No.-

PEG 분해균주의 분리와 PEG film의 상용성에 관한 연구

이제혁,정성제,이준열,전억한 경희대학교 부설 식량자원개발연구소 1993 硏究論文集 Vol.14 No.-

PEG를 sole carbon과 energy source로서 이용하는 미생물을 자연계에서 분리하였고, PEG의 분자량이 높아질수록 그 분해 미생물의 수가 감소하는 것을 확인하였다. 또한, liquid culture로서 PEG농도를 감소시키는 미생물을 선별하였고, 분해율은 PEG 8000이 약 18.8%였으며 PEG 10000은 약 25.4%인 것으로 조사되었다. PEG film의 제조를 위해 EMAA 및 EAA와의 상용성을 적외선 분광(IR) 스펙트럼을 사용하여 조사한 결과, EMAA와 EAA의 카르보닐기와 PEG의 에테르기와의 강한 수소결합이 형성으로 blend film제조시 상용성이 있는 것으로 확인되었다. Several strains capable of degrading PEGs(Polyethylene Glycols)were isolated and investigated for their biodgradation ability of PEGs. Microorganisms screened for the biodegradation studies were those grown on the PEG used as a sole carbon and energy source. It was known that the number of microorganisms decreased when grown on the high molecular weight of PEG(e.g. 20,000). A liquid culture was carried out with such microorgaisms and resulted in the decrease in PEG concentration meaning that PEG was degraded in the reactor. The biodegradability was found to be about 18.8% for PEG-8000 and 25.4% for PEG-10000, respectively. For the manufacture of biodegradable PEG film, EMAA/PEG and EAA/PEG blending ability was investigated with IR spectrum and showed that it was possible to produce blending film.

Bainite 球狀黑鉛鑄鐵의 磨滅特性에 미치는 殘留Mg의 影響

權赫茂,朴相俊,金水泳 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.2

Bainite spheroidal graphite cast iron specimens of 0∼0.054wt % residual Mg were casted into a green sand mold, 25 mm thickness Y-block. The microstuctures of the castings were studied for mechanical properties and abrasion characteristics. The results obtained from this study are summerized as follows: 1) Under the present expermental conditions, the relation between the abrasion speed and the abraded amount are; 0.5m/sec for 1^st abrasive wear and 2.38m/sec for 2^nd abrasive wear. 2) Increasing the residual Mg, the first abrasion speed for 2nd abrasive wear moved to the low abrasion speed. 3) The maximum amount of abraded material during 2^nd abrasive wear decreases with the increasing residual Mg content, and moves to the high abrasion speed as the residual Mg is increased over 0.042 wt %. 4) The amount of abraded materials increases with the decreasing residual Mg at abrasion speed 2.38 m/sec and with the increasing residual Mg at abrasion speed 0.62∼1.14 m/sec. 5) Increasing the abrasion speed, abrasion mechanisms are as follows; ⓐ 1^st abrasive wear ⓑ 1^st corrosive wear ⓒ 2^nd abrasive wear ⓓ 2^nd corrosive wear. But, Under the present expermental condition the adhesive wear mechanism didn't appear.

강릉시의 쓰레기 종량제의 실행실태 분석과 주민의식에 관한 고찰

박지혁,임준묵 강릉대학교동해안지역연구소 1996 東海岸硏究 Vol.6 No.2

본 연구는 강릉시에서 95년초부터 실시되고 있는 쓰레기 종량제의 실태를 몇 군데의 실예를 들어서 살펴보고, 문제점과 개선점을 주민의식의 설문조사와 그 분석으로부터 도출해보고자 한다. From the beginning of 1995, the specific-duty-system-on-trash(SDOST)has been executed on a national scale. We investigate a actual condition of SDOST through several actual examples. Analyzing those results, we draw out the issuing points on practicing the SDOST and present several improved suggestions.

광조형 시스템의 정밀조형을 위한 지지대 자동 생성 시스템 개발

강혁준,이형국,김효찬 동의공업대학 2000 論文集 Vol.26 No.1

Support structures are used to support a component during building process and must be removed once the building is complete. For precise building this paper specified types of support structures by means of geometry characteristics. They are point, line and area. And found a new algorithm for detecting geometries which need support structures. For easy of removing support structure teeth profile generation and interferences avoidance algorithm was studied.

안티몬 제거를 위한 킬레이트 막의 합성 및 흡착특성

최혁준,김민 한국공업화학회 2005 응용화학 Vol.9 No.1

Chelating forming groups were introduced into the polymer chains grafted onto a porous hollow-fiber membrane for Sb ion remove in waters by radiation-induced graft polymerization and subsequent functionalization of a monomer containing an epoxy group. Moreover adsorption characteristic and different pH of Sb ion by n-MG membrane were researched. The breakthrough curves overlapped independent of the permeation pressure, residence time. This indicates a negligible diffusional nass-transfer resistance of Sb ion to the chelating forming groups. Moreover the adsorption capacity of each n-MG membrane appeared the highest around pH 7.

농산물 소독과정에서 브롬화메틸에 노출된 근로자에게 발생한 신경병 2례

박태혁,김정일,손지언,김종국,김형수,정갑열,김준연 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.4

목적 : 농산물 소독과정에서 브롬화메틸에 노출된 근로자에게 발생한 신경병 2례 보고. 방법 : 피로감, 전신무력감, 어지럼증, 보행장애 등의 증상을 주소로 내원한 브롬화메틸을 사용하여 방역작업에 종사하는 건강한 20세와 18세의 근로자를 대상으로 혈액검사, 신경정도 및 근전도검사, 뇌자기공명영상 등의 임상검사와 작업력조사를 시행하였다. 결과 : 1례에서 뇌자기공명영상에서 연수와 소뇌의 양측 측충부의 고신호강도가 관찰되었고 11일 후의 추적조사에서 동일 부위의 고신호강토가 감소된 소견이 관찰되었으며 뇌병증으로 최종 진단되었다. 다른 1례는 신경전도검사에서 다발성 신경병 소견과 뇌유발전위검사에서 우측 하부 뇌간부위 병소가 관찰되었고 뇌병증 및 말초신경 병으로 최종 진단되었다. 결론 : 근로자들의 증상은 소독과정에서 브롬화메틸 노출로 인한 신경 병으로 판단되며 훈증소독과방역작업에 종사하는 근로자들의 실태조사와 안전에 대한 대책이 시급하다고 하겠다. Objectives : To report two cases of neuropathy due to methyl bromide intoxication. Methods : Workers, engaged in the fumigating process, complained fatigue, general weakness, ataxia, and hypersomnia. We evaluated them with blood tests, neurophysiologic studies and MRI and investigated their occupational history. Results : Increased signal intensities were found in the medulla oblongata and paraver mian of cerebellum in MRI and after 11 days, high signal intensities were reduced in the following MRI. In the other case, polyneuropathy and rlght lower brainstem lesion were observed In the NCV and BAEP studies. Conclusions : We confirmed that worker's symptoms were related to methyl bromide exposure in the fumigation. It is necessary that we should evaluate present condition of fumigating process and prepare appropriate methods to protect workers engaged in the fumigation.

혈관을 통한 생체항상성과 그에 대한 그리스도교적 인간학의 평가

강혁준 가톨릭대학교 인간학연구소 2000 인간연구 Vol.- No.1

배양골세포 이식이 치조골재생에 미치는 영향

정순준,허익,박준봉,이만섭,권영혁 慶熙大學校 齒科大學 1995 慶熙齒大論文集 Vol.17 No.2

This study was performed to estimate the effects of cultured bone cell inoculated on porous type hydroxyaptite for the regeneration of the artificial alveolar bone defect. In this experiment 3 beagle dogs were used, and each of them were divided into right and left mandible. Every surgical intervention were performed under the general anesthesia by using with intravenous injection of Pentobarbital sodium (30mg/Kg). To reduce the gingival bleeding during surgery, operative site was injected with Lidocaine hydrochloride (1:80,000 Epinephrine) as local anesthesia. After surgery experimental animal were feeded with soft diet(Mighty dog, Frisies Co., U.S.A.) for 1 weeks to avoid irritaion to soft tissue by food. 2 months before surgery both side of mandibular 1st premolar were extracted and bone chips from mandibular body were obtained from all animals. Bone cells were cultured from bone chips obtained from mandible with Dulbecco's Modified Essential Medium contained with 10% Fetal Bovine Serum under the conventional conditions. Porous type hydroxyapatite were immerse into the high concentrated cell suspension solution, and put 4 hours for attachment the cells on the surface of hydroxyapatite. Graft material were inserted on the artificial bone defect after 3 days of culture. Before insertion of cell-inoculated graft material, scanning electronic microscopic observation were performed to confirm the attachment and spreading of cell on the hydroxyapatite surface. 3 artificial bone defects were made with bone trephine drill on Abe both side of mandible of the experimental animal. First defect was designed without insertion of graft material as negative control, second was filled with porous replaniineform hydroxyapatite inoculated with cultured bone marrow cells as expermiental site, and third was filled with graft materials only as positive control. The size of every artificial bone defect was 3 mm in diameter and 3 mm in depth. After the every surgical intervention of animals, oral hygiene program were performed with 0.1% chlorhexidine digluconate. All of the animals were sacrificed at 2, 4, 6 weeks after surgery. For obtaining histological section, tissus were fixed in 2.5% Glutaldehyde and decalcified with Planko-Rycho Solution for 72 hr. Tissue embeding was performed in paraffin and cut parallel to the surface of mandibular body. Section in Bum thickness of tissue was done and stained with Hematoxylin-Eosin. All the specimens were observed under the light microscopy. The following results were obtained. 1. In the case of control site which has no graft material, less inflammatory cell infiltration and rapid new bone forming tendency were revealed compared with experimental groups. But bone surface were observed depression pattern on defect area because of soft tissue invasion into the artificial bone defect during the experimental period. 2. In the porous hydroxyapatite only group, inflammatory cell infiltration was prominet and dense connective tissue were encapsulated around grafted materials. osteoblastic activity in the early stage after surgery was low to compared with grafted with bone cells. 3. In the case of porous hydroxyapatite inoculated with bone cell, less inflammatory cell infiltration and rapid new bone formation activity was revealed than hydroxyapatite only group. Active new bone formation were observed in the early stage of control group. 4. The origin of new bone forming was revealed not from the center of, defected area but from the surface of preexisting bony wall on every specimen. 5. In this experiment, osteoclastic cell was not found around grafted materials, and fibrovascular invasion into regions with no noticeable foreign body reaction. Conclusively, the cultured bone cell inoculated onto the porous hydroxyapatite may have an important role of regeneration of artificial bone defects of alveolar bone.