리오캐스팅한 Al-Si 및 Mg-Al-Zn합금의 특성

이정일,양권승 조선대학교 생산기술연구소 2006 生産技術硏究 Vol.28 No.2

The effect of various thermomechanical treatments on the structure and rheological behaviour of Al-Si Al alloy and Mg-Al-Zn Mg alloy in its solidification range were investigated using a Searle type high temperature viscometer. During continuous cooling, the viscosity increases gradually with increasing fraction of solidified alloy, until a chtical fraction of solidified alloy is reached above which the viscosity sharply increases. The viscosity of the slurry, at a given volume fraction solid, decreased with increasing shear rate.

물과 Micelle 용액에서 Benzaldehyde의 전기화학적 환원에 대한 연구

金日光,金潤根,金峯元,印權植 圓光大學校 基礎自然科學硏究所 1988 基礎科學硏究誌 Vol.7 No.3

The electrochemical reduction of benzaldehyde in 10% ethanol-water solution contained surfactants has been studied by direct current (DC) differential pulse (DP) polarography, cyclic voltammetry (CV) and controlled potential coulometry (CPC). A totally irreversible electrode reaction processes of benzaldehyde reduction proceeded by one electron transfer to form anion radical which undergoes both protonation and a second one electron reduction to give benzyl alcohol as a major product. The cathodic reduction wave was seperated by inhibition of sodium lauryl sulfate due to selectivity and effect of anionic charged micelle. The possible reduction mechanism with controlled pH range was suggested.

이동통신네트워크에서 핸드오프 알고리즘을 이용한 적응형 동적 재라우팅 기법에 관한 연구

김일태,오인권,이진우 건국대학교 1997 학술논문집 : 건국대 대학원 Vol.45 No.1

In consequence of cellular network architecture evolution, a cell size is getting small such as micro/pico cell in new generation communication(FPLMTS). Due to the frequent handoffs in the pico cell, re-connection setup delay and the number of pre-established connections for the seamless handoff might be increased on ATM-based transport network. To reduce handoff processing delay and the number of pre-established connections, this paper proposes a new re-routing scheme. In the scheme, in order to obtain paths for handoff prior to handoff, the new cell architecture and the scheme of searching paths is also suggested. We conclude by comparing the proposed re-routing scheme to the existing schemes in the literature.

조선 중기 우주관과 천문역법의 주역적 인식 : 張顯光의 易學圖說에 나타난 상수역학을 중심으로

김일권 한림대학교 태동고전연구소 2006 泰東古典硏究 Vol.22 No.-

조선 중기의 우주관이 지니는 가장 큰 특징의 하나는 간단한 도상과 수상으로 자연 원리를 설명하려는 상수역학에 대한 관심과 연구가 매우 커지고 있었다는 점을 꼽을 수 있다. 흔히 조선의 성리학이 사단칠정론과 같은 심성론 관점을 중심으로 전개되었다고 일컬어지지만, 그와 또 다른 축으로 우주 자연에 대한 객관적 이법을 밝히려는 상수역 분야에 대한 관심을 지대하게 추구하고 있었다는 점을 함께 주목할 필요가 있다. 특히 양란을 전후로 한 17세기 사상지형에서 더욱 상수역학에 대한 관심을 높이고 있는 것을 짚어 볼 수 있으며, 이는 양란으로 인한 사회적 아노미를 규범화된 자연의 질서정연한 수리를 통하여 극복하려한 흔적이라 여겨진다. 상수역학적 우주관을 가장 방대한 분량으로 집성한 장현광의 《역학도설》(1608년)에서 그런 시대적 경향을 잘 읽을 수 있는데, 송대 성리학에서 새롭게 정립시킨 하낙도(河洛圖)의 수상과 선후천 팔괘도상에 의한 괘수론(卦數論)적 관점이 천문역법의 주역적 원리를 규명하는 중요한 인식 도구로 사용되고 있었다. 그와 더불어 한역에서 흥기 하였던 괘기론(卦氣論)에 대한 관심도 크게 개진되어 있어, 조선 중기의 성리학에서 한역과 송역의 양대 상수학에 대한 종합적인 탐구가 이루어졌던 것이라 여겨진다. 이러한 역리와 수리의 상수학적인 추동력이 조선 후기의 우주관을 더욱 규범화시키는 주요 동인의 하나가 되었을 것이며, 그런 토대 위에 서양의 신법 천문학도 접목되어간 것이라 할 수 있을 것이다.

地中送電관의 최적 되메움재 선정을 위한 열특성 硏究

윤성중,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2003 산업기술연구논문집 Vol.18 No.2

The purpose of this paper is development of the most suitable backfill material which increases thermal stability and decreases thermal resistances for increasing capacity of the transmission of electricity. In order to proceed this study, the sand which recently was used as backfill material and the stone dust as single material for most suitable backfill material was chosen and experiments on thermal character and basic soil properties were proceeded for appreciating stability and economical efficiency. As a result of this study, natural moisture content of stone dust was higher than that of sand and porosity of stone dust and thermal resistance of stone dust was lower than that of sand. Then the stone dust are expected to increase capacity of the transmission of electricity. In point of stability, because total strain of pipe was within allowed strain, two materials are expected to ensure against risks. Stone dust is considered as useful backfill materials by contributing great economical efficiency, because a price of stone dust is half to the sand.

대절토 암반사면의 안정화 검토 및 현장계측 분석

박범준,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2003 산업기술연구논문집 Vol.18 No.2

We investigated the stability of rock slope caused by large-scale cutting on construction of rapid-transit railway. Applying anchor method in order to build the up, we analyzed the stability using long-term measurement. Slope stability analysis is established by STABL 5M and DIPS as basic programs. Field measurement is required to prove the stability of rock slope which results from the reinforcement corresponding to slope stability analysis. Thus, we used one ground inclinometer and 8 load-cells for the measurement system.

한국산야생등줄쥐(Apodemus agrarius coreae)의 해마복합체에서 neuropeptide Y 면역반응세포에 관한 연구

김무강,송치원,이경열,박일권,정영길,이강이,김종섭 충남대학교 수의과대학 동물의과학연구소 1997 動物醫科學硏究誌 Vol.5 No.-

Neuropeptide Y(NPY) was first isolated from porcine brain. This discovery has lead some workers to study the distribution of this peptide in the central nervous system of various mammals. In this study the distribution pattern of neuropeptide Y-immunoreactive neurons was examined in the hippocampal complex of Striped field mouse in Korea(Apodemus agrarius coreae) Experimental animals were anesthesized with thiopental sodium and perfused with 4% paraformaldehyde through the left ventricle and the ascending aorta. The brains were removed and transferred 10%, 20% and 30% sucrose solution. Sections were cut on a cryostat into 40㎛-thick. The tissue was immunostained with free-floating and avidin-biotm complex(ABC) method. The results obtained in this study were summarized as followings. 1. The most of NPY-IR neurons in hippocampus proper were found in the polymorphic layer and a few was found in the pyramidal layer. 2. The process run vertically in the deep polymorphic layer and run parallel to corpus callosum in superficial polymorphic layer. 3. The shapes of neurons in hippocampus proper were varied of polymorphic, oval or round, and the nerve fibers were found in the molecular laver and the hippocampal fissure. 4. The highest density in number of NPY-IR neurons on dentate gyrus were found in hilar area of dentate gyrus. 5. The most of NPY-IR nerve fibers were found in molecular cell layer.

土壓과 輪壓에 따른 淺層地中理設管의 變形量 分析

박종엽,상현규,류권일,김팔규 충남대학교 산업기술연구소 2002 산업기술연구논문집 Vol.17 No.1

In this paper, indoor soil tank is used to measure the deformation of flexible pipe in the soil mass on the theory of Bossinesq's stress and Marston's Ditch Conduit case. Besides, field compaction test is perfomed for compaction effect of the real construction field. In compression test of the pipe in the soil mass, the flexible pipe has 3.5% of the allowed defomation, and 220kg of the allowed compression load. With theories and soil tank test in this study, the allowed deformation ratio of the flexible pipe is determined to be safe at the depth over 40cm. Consequently, it is considered that the quality of the pipe should be maintained, and the development of the high quality pipe is needed for the safe and economical construction. Especially in compaction, inappropriate compaction could be dangerous.

당뇨병성 신증 환자 20예에서 복합한약전탕액이 신기능에 미치는 영향

최우정,김동웅,신선호,이언정,최진영,신학수,조권일,이광석 대한동의생리학회,대한동의병리학회 2003 동의생리병리학회지 Vol.17 No.2

Diabetic Nephropathy is one of the major causes of chronic renal failure. It is a common microvascular complication and clinically defined as the presence of persistent Proteinuria. We studied the effects and change of the renal function of Complex Herbal medication of the 20Diabetic Nephropathy patients. We measured the initial levels of Total Protein, Creatinine Clearance Rate(Ccr), Serum Creatinine(Serum-Cr), Urine Creatinine(Urine-Cr) and HbA1C on admission and followed up the level changes of Total Protein, Ccr, Serum-Cr and Urine-Cr on discharge. The results are following : Complex Herbal Medication does not cause the renal toxicity. The longer hypertension period is, the higher Serum-Cr level and Urine-Cr level. In an older age group, Urine-Cr is lower. 4.From the "Deficiency in Origin and Excess in Superficiality(本虛表實)“points of view, Complex Herbal Medication improves the Serum-Cr in Diabetic Nephropathy patients. According to this results, it could be suggested that Complex Herbal Medication does not cause the renal toxicity in Diabetic Nephropathy patients and intensive controls of blood sugar, blood pressure and Complex Herbal Medication prevent the renal failure in Diabetic Nephropathy patients with early stage of Microalbumiuria.

Motivations and Characteristics of Hashtag Users

( Gwon Il Kim ),( Ga Yeon Jung ),( Ye Ji Song ),( Jee Sun Park ) 한국패션비즈니스학회 2015 패션 비즈니스 Vol.19 No.6

In social environments, hashtags have been widely adopted and have become a new form of language for users. The current study attempts to enhance our understanding of users and their motivations to use hashtags when posting fashion-related information. Specifically, this study examines whether user characteristics (fashion leadership, conspicuousness) influence their motivations to use hashtags (curation, self-presentation, information diffusion), which then leads to behavioral intentions to continue to use hashtags and recommend the same to others. An online survey was administered to test our research questions. A total of 136 consumers in their 20s, 30s, and 40s living in Korea were used for data analysis. Structural equation modeling was conducted, which revealed that fashion leadership and conspicuousness had a positive impact on users’ motivations of curation, self-presentation, and information diffusion. Motivations of self-presentation and information diffusions were found to affect users’ behavioral intentions while curation had no significant impact. Practical implications are presented.