성능 인자의 평가를 통한 망관리 방법

권혁인,임재현 중앙대학교 기술과학연구소 1995 기술과학연구소 논문집 Vol.25 No.-

여러 가지 망들의 성능을 표시하는 변수들의 의미에 대해서는 이미 정확한 정의가 국제 표준에 정의되어 있다. 그러나 상호연결된 이종망을 위한 성능인자의 정의가 미흡한 상황이다. 즉 영역별로 정의된 인자들의 상관관계가 명확하지 않다. 본 논문에서는 양단간 성능인자의 측정에 근거하여 상호연결된 망의 관리를 수행하는 방법을 제시한다. International standards already provide precise definitions for the indicators semantics concerning the different networks. However, these definitions are not completed yet to support interconnected heterogeneous networks. Several networks have not been completely defined (e.g. Ethernet, ATM). Moreover, there is no correlation between the performance indicators defined fro each domain. This paper presents an approach for the management of interconnected networks performance, based on the assessment of global end-to-end transport indicators.

산청군 산림지가 형성요인에 관한 연구

권철현,이상태,신현철,최재채,정영관 경상대학교 농업생명과학연구원 2003 농업생명과학연구 Vol.37 No.1

본 연구는 산청군 남부와 북부지역 361개소의 공시지가와 일반시가에 대하여 분석하였다. 지가 형성요인에 대하여 단계별 회귀분석을 실시하였으며, 그 결과는 다음과 같다. 남부지역에 대한 공시지가와 관련된 5변수 모형에 의한 추정식은 Y = 332.1973 +0.0099X_26 - 0.3577 X_8+ 0.0291X_24 - 2.6768X_2 - 26.1452X_3 이며, 회귀식에 대한 설명력은 90%로 높게 나타났으며, 일반시가에 대한 추정식은 Y = 1035.7976 -185.8280X_21 -3.3937X_1 + 405.6658X_19 -0.4703X_8 이며, 추정식에 대한 설명력은 92%롤 비교적 높게 나타났다. 북부지역에 대한 지가 형성요인에 의한 공시지가 추정모형은 Y = 176.7875 + 0.0205X_25 -0.1168X_8 + 0.0015X_26 -46.3447X_21 로 추정되었으며, 회귀식에 대한 설명력은 96%, 일반시가의 추정 모형은 Y = 203.0697 + 0.0430X_25 + 0.0027X_26 -28.8276X_4 -46.7856X_21 -0.0007X_23 으로 추정되었으며, 회귀식에 대한 설명력은 90%로 나타났다. 이상과 같이 접근요인은 부의 영향을, 그 외 다른 요인들은 지가에 양의 영향을 미치는 것으로 나타났다. This study was carried out to analyze the publicly announced land price and actual land price compared to the northern and southern region of 361 forest land place in Sanchung county. To decipher factors for making forest land price it used the stepwise regression analysis. And the result of analysis are followings; Y = 332.1973 +0.0099X_26 - 0.3577 X_8+ 0.0291X_24 - 2.6768X_2 - 26.1452X_3 (R^2=90%) and the estimation equation of actual price analyze the publicly announced and actual price compared to the northern and southern regions of Sanchung county of price was obtained as Y = 1035.7976 -185.8280X_21 -3.3937X_1 + 405.6658X_19 -0.4703X_8(R^2=92%). In the northern region, the estimation equation of publicly announced land price by the factors for making forest land price was obtained Y = 176.7875 + 0.0205X_25 -0.1168X_8 + 0.0015X_26 -46.3447X_21(R^2=96%) and the estimation equation of actual price was obtained as Y = 203.0697 + 0.0430X_25 + 0.0027X_26 -28.8276X_4 -46.7856X_21 -0.0007X_23(R^2=90%). In the result of the stepwise regression analysis, it was a showed negative effect of the proximity factor and the positive effect between others factor and land price.

전처리 방법에 따른 하수슬러지 가용화 비교연구

권재현,김봉준,김민규,염익태,김형수 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4

The pretreatment process was carried out to solubilize the sewage sludge for enhancing its biodegradability using alkaline treatment, ultrasonic treatment(l5kHz), ozone treatment and different combination of these three methods: alkaline followed by ultrasonic as well as ozone, and ultrasonic followed by alkaline. The solubilization efficiency was evaluated based on the SCOD/TCOD ratio and VSS/TS ratio. In results, the proper condition of alkaline treatment was shown as 30meq/l of NaOH, pH 12 and 3hours of reaction time. Solubilization efficiency increased to 17% from initial 2% based on SCOD/TCOD ratio under this condition. In ultrasonic treatment, the higher ultrasonic power, the longer treatment time and the lower sludge volume resulted in higher solubilization respectively. There was a rapid increase in solubilization efficiency after 20 minute, then it was measured as 32% of SCOD/TCOD ratio in 1 hour at a ultrasonic power of 1,300W with 1/sludge. Solubilization efficiencies in combined treatment using alkaline and ultrasonic were 47-53% higher than single treatment at a sonicated time of 1 hour. Ozone treatment followed by alkaline treatment also represented the enhanced solubilization compared to ozone treatment. Therefore, ultrasonic or ozone treatment assisted by alkaline could achieve the short treatment time as well as high solubilizetion efficiency.

신경섬유종증 환자에게서 발생한 특발성 혈소판 감소증 1예

권세훈,김형호,강지인,장재혁,원경준,장재현,김상용,배학연 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.3

Idiopathic thrombocytopenic purpura is a disease characterized by thrombocytopenia in peripheral blood with positive anti-platelet antibody titer, no splenomegaly, the presence of megakarocyte. The causes of idiopathic thrombocytopenic purpura were usually related to autoimmune disease, infection and drugs. A 46-years-old man was admitted for evaluation of abdominal mass. He has many cafe-au-lait spots and nodules in almost skin for 30 years. Several years ago, he palpated mass in Lt. inguinal area. hIe has known the abdominal mass after checking abdomen CT in local clinic and visited our hospital for evaluation of abdominal mass. At admission, laboratory tests showed hemoglobin 12.5 g/dL, hematocrit 38.4 %, WBC 5,460 /㎣ (neutrophil 64.5%, lymphocyte 21.7%, monocyte 4.1%, eosinophil 5.4%), reticulocyte 0.7%, Platelet 52,000 /㎣, total protein 6.51 g/dL, albumin 3.80 g/dL, alkaline pohsphatase 161 IU/L, AST 110.7 IU/L, ALT 64.9 IU/L, total bilirubin 0.44 ㎎/dL, BUN 18.4 ㎎/dL, creatinine 0.79 ㎎/dL. Peripheral blood smear showed normocytic normochromic anemia, thrombocytopenia. Bone marrow aspiration smear showed normoplastic myeloid and erythroid precursor. The bone marrow biopsy section shows normocellular marrow (35%) for his age and mildly increasing myeloid cell lineage. We have experienced a case of idiopathic thrombocytopenic purpura in a patient being in neurofibromatosis and therefore reporting it with documentary records. 저자들은 신경섬유종증 환자에서 특별한 원인을 발견할 수 없었음에도 특발성 혈소판 감소증이 발생한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.

國産스테인레스鋼線系 矯正用線材의 開發과 物理的 性質에 關한 硏究

권오원,성재현,이기대,경희문 대한치과교정학회 1989 대한치과교정학회지 Vol.19 No.2

The physical properties of seven sizes of control groups and experimental group in stainless steel orthodontic wires were studied in tension, hardness, bending, torsion and observation of microstructure. The wires (0.40 - 0.90mm dia.) of round type were tested in the as-received condition. The wires of control groups were TRU-CHROME and REMANIUM, and experimental group was SK wire which was developed by ourselves and made in Korea. The results were as follows: 1. The chemical compositions of control groups and experimental group were austentie stainless steel wires of SOS 304. 2. Higher values of tensile and yield strength in tension were control group I, experimental group, control group II. Maximum tensile and yield strength of experimental group were 203.63 ±1.41kg/mm²in 0.70mm diameter and 148.96 ± 4.88kg/mm² in 0.60mm diameter, and maximum elongation was 5.20 ± 0.57% in 0.45mm diameter. 3. Hardness values of experimental group were similar to control groups. Maximum hardness values were 596.2 ± 13.66 Hv in 0.45mm diameter wire of control group I, 590.5 ± 20.08Hv in 0.50 mm diameter wire of control group II, and 563.6 ± 5.35 Hv in 0.70mm diameter wire of experimental group. 4. Torsion properties of experimental group were similar to control group I and more than control group II. Maximum torsion cycles were 31.8 ± 2.48 in 0.45mm diameter of control group I,17.4 ± 4.84 in 0.60mm diameter of control group II, and 24.6 ± 3.04 in 0.45mm diameter of experimental group. 5. Maximum bending cycles of experimental group were smaller than control groups. Maximum bending cycles were 9.00 ± 0.00 in 0.50mm diameter wire of control group I, 10.0 ± 0.82 in 0.40mm diameter wire of control group II, and 8.0 ± 1.26 in 0.50 mm diameter wire of experimental group. 6. Microstructures of experimental and control groups co-existed with martensited austenite structure and elongated austenite structure. 7. The direction of wire fracture was propagated parallel to torsion direction typically and there was no probability showing wire fracture at inclusions and surface scratches. 8. The type of wire fracture was brittle fracture at initiation site and ductile fracture at core.

망이산성 출토유물의 성격

권상열,윤종균,성재현 한국고고미술연구소 2005 고고학지 Vol.14 No.-

충북 음성군 망이산성(望伊山城) 출토유물은 2001년 12월 국립청주박물관에 신고된 발견매장문화재이다. 국립청주박물관에서는 출토지에 대한 현지조사를 실시하였으나, 신고지는 이미 약수터의 휴식공간으로 정지되어 있어 유구 및 출토상황을 전혀 확인할 수 없었다. 출토유물들은 산성 내 봉수대의 남쪽 경사면 아래에서 발견되었으며, 철제갑옷을 비롯하여 철부(鐵釜), 주조철부(鑄造鐵釜), 토기편 등이 함께 출토되었다. 이 가운데 철제갑옷은 그 동안 백제지역에서 출토예가 매우 드물었던 무구류의 하나로서, 더구나 보존상태가 양호하여 거의 원형을 유지하고 있다는 점에서 학술적 가치가 대단히 높은 것으로 생각되며 나머지 유물 역시 유적의 성격이나 지역 역사를 이해하는데 있어 고고학적으로 중요한 자료라 생각된다. Artifacts were discovered from the Mangyi mountain fortress (Yangdeok-ri, Eumseong county, North Chungcheong province) during construction of a resting place near a mountain-hiking trail. The retrieved artifacts include iron armor, iron pot, iron axe, clamps, and potsherds. The Mangyi mountain fortress is located in the central inland region of the Korean peninsula, which is considered the central place in transportation. The fortress also commands a fine view over a large area and sits on a location that had been strategically important since the Three-Kingdoms period until the Chosun period. Excavations at the location have revealed Baekje pottery, as well as artifacts dated to the Unified Silla period and the Goryeo period. Remains of the Baekje earthen fortress also deserve recognition. The artifacts being introduced in this paper, along with those already reported, provide important archaeological information that not only sheds light on the Mangyi mountain fortress itself, but also on the regional history. Although contextual information of the artifacts and the associated archaeological features have not been reported well due to the construction project at the site, we conclude that these artifacts are dated from the fourth to the fifth century AD. based on stylistic features. In addition, it should be emphasized that the discovery of iron armor is almost unprecedented in the Baekje region. The iron armor found at the site is very important in studying ancient weapons and their development over time. The cast-iron axe, clamps, and potsherds are stylistically similar to those found in the neighboring regions. Through these artifacts, we will be able to study the political situation of the region during the Three-Kingdoms period. The primary importance of the artifacts discovered from the Mangyi mountain fortress lies in their contribution to the studies of regional history.

이동 단말기용 내장형 slot 안테나 구현

권원현,허재헌 안양대학교 산업기술연구소 2002 自然科學硏究 Vol.9 No.-

본 논문에서는 이동통신 단말기용 내장형 안테나를 연구 개발하였다. 개발된 안테나는 동축형 구조를 갖고 있으며, 스트립 선로를 이용하여 급전 구조를 구현하였다. 안테나의 공진부는 슬롯 구조를 갖는 동축 슬롯 공진형으로 설계하여 IMT-2000 대역인 2.0 GHz 대역에서 공진이 가능하도록 하였다. 구현된 안테나는 26 x 13 x 1.2 ㎣의 크기를 지녀 이동통신 단말기에 쉽게 내장할 수 있음을 알 수 있었다. In this paper, embedded antenna for wireless mobile phone is developed. Developed antenna uses the coaxial type slot structure and its feeding line is implemented by using microstrip line. Resonator part of slot antenna is designed utilizing coaxial type slot resonator structure, and its design parameters are optimized to have 2.0 GHz resonance frequency for IMT-2000 handset. Implemented antenna has 26 x 13 x 1.2 ㎣ physical dimensions, which can be easily applicable to an embedded antenna of mobile phone.

중대산업사고 예방을 위한 종합위험관리체제(IRMS) 구축에 관한 연구

권혁면,성대현,김재현,임대식,김기영,편무욱,문일,고재욱,이영순,윤인섭 한국안전학회 2003 한국안전학회지 Vol.18 No.3

The Process Safety Management (PSM) by the Law of Industry, Safety and Health has been performed for preventing major accidents of chemical plants since 1996. In terms of preventing chemical accidents more precisely, it is essential to develop a tool for quantitative risk assessment. For this, KOSHA (Korea Occupational Safety and Health Agency) developed an Integrated Risk Management System (IRMS) . The system is designed to assimilate data on chemical plant hazards from external database, to integrate these data with location information (topographic and demographic), and to make them user-friendly accessible. The system consists of several main functions: display of five major Korean petrochemical complex layout, display of equipment layout with its information utilizing the external database, zonation of the hazard effected area with consequence analyses, the most probable accident scenario generation, accident/incident database and calculation of frequency of accident using equipment reliability database, etc. The highlight of IRMS is to provide the risk contours using GIS(Geographical Information System) technology. IRMS is intended to manage hazardous installation more systematically and effectively, to reduce the number of accident remarkably, further minimizing production loss in the plant. The system is now under application to about 500 PSM sites as well as and emergency authorities in Korea by KOSHA (Korea Occupational Safety and Health Agency)

소아 조갑진균증에서 Itraconazole 주기요법의 치료효과

권경술,이재봉,진현우,오창근,장호선,임재영 대한의진균학회 2003 대한의진균학회지 Vol.8 No.4

개인휴대 단말용 무선부 회로 설계 개발

권원현,허지헌,홍진표 안양대학교 자연과학연구소 1996 自然科學硏究 Vol.3 No.-

본 논문에서는 미래의 개인휴대통신 서비스용 단말인 1세대 PDA (Personal Digital Assistant)의 설계, 개발 및 시험에 관하여 서술하였다. 135 x 76 x 18 ㎜ 크기의 개발된 제품은 기존의 전자수첩에 pager의 기능을 부가시킨 Pager PDA로서 320 MHz 대역의 1200bps/2400bps 정보를 모두 수신 가능하며, 전국적인 서비스가 가능한 광역 페이져의 형태로 설계하였다. 이를 위해 사용지역에 따라 주파수가 자동으로 변환되는 PLL 형태의 국부 발진기를 설계 개발하였다. 시험결과 개발된 제품은 일반 페이져가 만족하여야 할 IEC 표준 규정을 모두 만족하였으며, 수신감도 또한 우수함을 알 수 있었다. In this paper, first generation of PDA(personal digital assistant) in which the function of pager is merged into electronic notebook has been developed and commercialized to fulfill the requirement of PCS equipment. Developed product of 135 x 76 x 18 ㎣ size operates in 320 MHz paging frequency bands and receives 1200bps or 2400bps paging data. And also, it adopts PLL type local oscillator whose operating frequency changes with the user locations to ensure the nationwide paging services. Experimental results show that the developed product meets well all of the IEC specifications and has high receiving sensitivity.