Homomorphic Encryptions at a Long Distance Through Quantum Key Distribution Protocols

JEONG*, Kabgyun,KIM, Yong Jin,YOON, Jong Beom,KIM, Geon Woo,CHO, Gueha,KIM, Suntaek Korean Physical Society 2019 새물리 Vol.69 No.2

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

PFA / Silica 유-무기 복합체의 제조 및 표면특성

범정철,하종욱,박인준,이수복 한국공업화학회 2003 응용화학 Vol.7 No.1

Poly(perfluoroalkyl acrylate)(PFA) / silica composites having different silica size were prepared by surface polymerization. In this study, surface characterizations of PFA/silica composites were done by HR-TEM(High Resolution Transmission Microscopy), contact angle measurement, sliding angle measurement, surface roughness measurement, and the relationships between the sliding angle and the contact angle were investigated. In the highly hydrophobic region, the sliding angles of water droplets decreased with increasing contact angle. Their surface free energies were calculated with contact angle data by geometric mean approximation. The composites with super water repellent and sliding could be obtained with contact angle of above 150。and sliding angle of below 10。to water droplets. The ultimate value of surface free energies of the composites reached below ca. ldyn/cm.

질병의 활동도 지표로써 머리카락 중 미량의 구리와 아연의 분석

정한성,최범석 慶熙大學校 材料科學技術硏究所 1997 材料科學技術硏究論集 Vol.10 No.-

The copper and zinc in scalp hair are determined by the ICP-AES and the relations between the trace elements concentrations with disease activity for the rheumatoid arthritis are investigated. The concentrations of the metals are varied depending upon the distance from the skin. The concentrations at the distal are higher than that of the proximal. Zinc concentration of the rheumatoid arthritis patients is higher than that of the osteroarthritis ones, and the confidence level that the group are different lies 95-99%. However, copper concentration for rheumatoid arthritis patients is lower and the two groups are different with a 50-80% confidence level.

타이밍 오류 검출회로의 설계

정한철,곽철호,김정범 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-

Error control is one of major concerns in many computer systems. Experience shows that most malfunctions during system operation are caused by transient faults, which often mean abnormal signal delays that may result in violations of circuit element timing constraints. This paper presents a novel CMOS-based concurrent timing error detector that makes a flip-flop (or other timing-sensitive circuit element) to sense and then signal whether its data has been potentially corrupted or not by a setup or hold timing violation. Designed circuit performs a quiescent supply current evaluation to determine timing violation from the input changes in relation to a clock edge. If the input is too close to the clock time, the resulting switching transient current in the detection circuit exceeds a reference threshold at the instant of the clock transition and an error is flagged. The simulation results in this paper shows that designed circuit can be used to detect setup and hold time violations effectively in clocked circuit element.

CITIS 지원 기술정보관리 시스템의 설계

정석찬,한태창,서범수,조장혁,주경준 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1

CITIS(Contractor Integrated Technical Information Service) is a contractor's developed service to provide electronic access and/or delivery of contractually required information. CITIS satisfies one of the major CALS objectives to furnish a single-entry point for authorized access to contractor-generated Contract Data Requirement List(CDRL) data. A critical requirement for the practical implementation of the CITIS concept is the ability to access multiple existing heterogeneous databases in a fashion transparent to the CITIS user. In this paper, we will propose a prototype system model for CITIS, and discuss the system architecture of proposed CITIS system as a global information management system for distributed and heterogeneous local information systems. Furthermore, we will discuss about the required server module and using-scenario of proposed CITIS system.

안양천의 수질개선 방안에 관한 연구

서정범 안양대학교 자연과학연구소 1997 自然科學硏究 Vol.4 No.-

안양천은 서울지역 한강의 4대 지류중의 하나이다. 안양천 유역에는 약 350만명의 인구가 거주하고 있으나 생활하수 및 공장폐수로 심하게 오염되어 있어 어떠한 목적으로도 안양천의 하천수를 이용할 수 없는 상황이다. 안양천 상류지역에 있어서의 급속한 도시화로 인한 인구 집중현상과 여러 제조회사들이 들어섬에 따라 이들 생활하수와 공장폐수를 처리하기 위한 하수도 시설은 부족한 실정이다. 본 연구의 목적은 안양천 유역의 일반사항을 조사하고 수질을 측정하여 수질을 개선하기 위한 방안을 제시하는데 있다. The Anyang stream is one of four tributaries of the Han river in Seoul metropolitan area. About 3.5 million people live in its watershed but they do not use the stream water highly contaminated by municipal and industrial wastewater. Sewerage systems were insufficient and for the industrial wastewater of many kinds of manufacturing companies in upstream area of the Anyang stream. The purpose of this study were to investigate general aspects of Anyang stream watershed, to measure the water quality and to suggest the future conditions to improve water quality.

모 주물공장 근로자의 작업공정별 분진폭로량, 자각증상 및 건강진단판정 비교

이범식,조영채,변정식,김동현,원선혜,김정윤 忠南大學校 環境問題硏究所 1995 環境硏究 Vol.13 No.-

The relationship among dust exposure dose, special health diagnosis results and subjective symptom questionaire survey for 109 casting foundry workers supervised by a local laber office has been studied from august to october 1993. Subjective symptom, dust exposure dose and health examination evaluation of respective working processes have been analized and concluded as follows; 1. Metal fume concentration in melting process measured 3.21±1.46㎎/㎥ is under threshould limit value(TLV;5.0㎎/㎥), casting sand dust measured in molding and desanding process is 5.8 ±3.41㎎/㎥ and 9.69 ±2.64㎎/㎥ which is 3-5 times higher than TLV(2.0㎎/㎥), metal fume, welding fume and metal dust in finishing process measured 9.34 ±1.32, 13.73 ±16.97 and 10.17 ±3.50㎎/㎥ respectively, which are also 2-3 times higher than TLV(5.0㎎/㎥). 2. The complain rate subjective symptoms appeal evaluated for finishing process are 35.9%, 46.2%, 27.2% and 42.2% for eye smptoms, respiractory, skin, general symptom respectively and the rates above express the highest values and the complain rates for melting process are 24.4%, 37.5% and 35.7% for eye smptoms, respiratory and mental system respectively and for molding and desanding it is 24.3%. 3. Perceived occupational disease rate is found 0.9% with are out of 109 worker surveyed who have been exposed in metal fume of finishing process. 4. 33.0% of workers surved are found to require close examination, the worker of hepatopathy suspected are 21.4% which is the highest and 3.7% for circulatory disturbance suspected. 5. The statistically significant variables in general chracteristics that affect health examination evaluation are smoking(P<0.001), respirator put-on (P<0.05) and working career(P<0.05). 6. Cough(P<0.001), "headache"(P<0.05) and "easily skin exchange by slight stimulation" (P<0.05) are statistically significant to the subjective symptom variables affect health examination evaluation.

토양트렌치공법에 의한 오염 하천수의 처리

서정범 안양대학교 1996 논문집 Vol.16 No.-

For a practical application of technologies for treating the polluted stream water, soil trench facilities were installed at the flood plane of the Changneung Stream as the pilot-scale and this stream water was treated for one year. The results are as follows: 1. Two types of soil trench facilites with hydraulic loadings of 85L/m trench·day(trench Ⅰ) and 115L/m trench·day(trench Ⅱ) were installed and operated. Annual average BOD concentrations of influent into soil trenches was 36.3mg/L and average effluents from trench Ⅰ and trench Ⅱ were 8.7mg/l and 9.1mg/L, respectively. 2. Monthly effluents BOD concentrations from Dec. to Feb. and 10.5-13.4mg/L in the rainy season from May to July. Effluent quality this period became worse in comparison with the cold season. 3. Annual SS concentrations of influent into trenches was 24.0mg/L but effluents concentrations from trench Ⅰ and trench Ⅱ were 3.5mg/L and 3.2mg/L, respectively. 4. Influent TKN concentrations with 8.5mg/L was decreased to 3.5mg/L by trench Ⅰ and 4.1mg/L by trench Ⅱ and effluent TKN concentrations were relatively high in the cold season. T-P concentrations in influent was 1.10mg/L but effluent concentrations from trench Ⅰ and trench Ⅱ were 0.26mg/L and 0.30mg/L, respectively.

한강수계 유입지천의 오염부하량 산정

서정범 안양대학교 산업기술연구소 1998 自然科學硏究 Vol.5 No.2

북한강의 의암댐과 팔당댐 사이 및 남한강의 충주댐과 팔당댐 사이의 102개 지천의 유량과 수질을 조사하고 오염부하량을 산정하였다. 유량이 가장 많은 제1 지천은 달천이었으며, 진암천, 소양천, 중리천, 양근천 등 도시지역을 통과하는 제2 지천은 BOD 농도가 높았다. 제1 지천중 BOD와 TN 농도가 가장 높은 지천은 경안천으로서 각각 8.5mg/L 및 7.94mg/L였으며, BOD부하량이 가장 높은 지천은 경안천으로서 2,057Kg/day였고, TN 및 TP의 부하량이 가장 높은 지천은 달천으로서 각각 6,956Kg/day 및 1,245Kg/day로 나타났다. This study was focused on survey of flow rate and pollutant concentration and on estimation of pollutant load for the 102 branch streams of Han-river. The results of the survey showed that flow rate of Dal-stream was particulary high among the first branch streams. Second branch streams passed through city or town as Jinam stream, Soyang stream, Joongri stream, Yangkeun stream showed high BOD concentration. Kyungan stream among the first branch streams was surveyed to highest BOD and TN concentration as 8.5mg/L and 7.94mg/L, respectively. Kyungan stream was showed the highest BOD load as 2,057Kg/day and Dal stream was showed the highest TN and TP load as 6,956Kg/day and 1,245Kg/day, respectively.