• Title/Summary/Keyword: problem analysis

Search Result 16,365, Processing Time 0.043 seconds

Design and Implementation of a Concuuuency Control Manager for Main Memory Databases (주기억장치 데이터베이스를 위한 동시성 제어 관리자의 설계 및 구현)

  • Kim, Sang-Wook;Jang, Yeon-Jeong;Kim, Yun-Ho;Kim, Jin-Ho;Lee, Seung-Sun;Choi, Wan
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.25 no.4B
    • /
    • pp.646-680
    • /
    • 2000
  • In this paper, we discuss the design and implementation of a concurrency control manager for a main memory DBMS(MMDBMS). Since an MMDBMS, unlike a disk-based DBMS, performs all of data update or retrieval operations by accessing main memory only, the portion of the cost for concurrency control in the total cost for a data update or retrieval is fairly high. Thus, the development of an efficient concurrency control manager highly accelerates the performance of the entire system. Our concurrency control manager employs the 2-phase locking protocol, and has the following characteristics. First, it adapts the partition, an allocation unit of main memory, as a locking granule, and thus, effectively adjusts the trade-off between the system concurrency and locking cost through the analysis of applications. Second, it enjoys low locking costs by maintaining the lock information directly in the partition itself. Third, it provides the latch as a mechanism for physical consistency of system data. Our latch supports both of the shared and exclusive modes, and maximizes the CPU utilization by combining the Bakery algorithm and Unix semaphore facility. Fourth, for solving the deadlock problem, it periodically examines whether a system is in a deadlock state using lock waiting information. In addition, we discuss various issues arising in development such as mutual exclusion of a transaction table, mutual exclusion of indexes and system catalogs, and realtime application supports.

  • PDF

Using Analytic Network Process to Establish Performance Evaluation Indicators for the R&D Management Department in Taiwan's High-tech Industry

  • Liu, Pang-Lo;Tsai, Chih-Hung
    • International Journal of Quality Innovation
    • /
    • v.8 no.3
    • /
    • pp.156-172
    • /
    • 2007
  • The high-tech industry is the economic lifeline for Taiwan. Its characteristics are short product life cycle, rapid changes in the market, and a high obsolescence rate for new products. Under globalization, the high-tech industry has adopted Information Technology (IT) to shorten the manufacturing process, reduce costs and conduct product research and development (R&D) to increase the core competence of enterprises and achieve the goal of sustainable operations. Enterprises should actively strengthen their integration with internal and external resources and lead in R&D management to increase industrial operating performance. Effectively managing operations and R&D management evaluation in Taiwan's High-tech Industry has become a critical subject. This study adopted 4 major Balanced Scorecard (BSC) perspectives to establish the Total Performance Evaluation Indicators for the R&D management department in Taiwan's High-tech Industry. The Analytic Network Process (ANP) was applied to evaluate the overall performance of the R&D management department. The research framework is divided into 2 phases. The first phase is combined with the 4 major perspectives, Financial, Customer, Internal Business Process and Learning and Growth, as the related indicators for each measurement perspective. The Key Performance Indicators (KPI) were selected using Factor Analysis to identify the key factor from the complicated indicators. The relationship between the characteristics of each BSC's evaluation perspective is dependence and feedback. This study applied ANP to conduct the calculation and adjustment of correlation between each KPI, and determine on their relative weights for the objective KPI. The "Financial Perspective" for R&D management department in Taiwan's High-tech Industry focused on the budget achievement rate of R&D management. The weight indicator value is (0.05863). The "Customer Perspective" focused on problem-solving satisfaction. The weight value of this indicator is (0.17549). The "Internal Business Process Perspective" focused on the quantity and quality of R&D. The weight value of this indicator is (0.13506). The "Learning and Growth Perspective" focused on improving competence in the research personnel's professional techniques. The weight value of this indicator is (0.02789). From the total weighting indicators, the order of the Performance Indicators for the R&D management department in Taiwan's High-tech Industry is: (1) Customer Perspective; (2) Internal Business Process Perspective; (3) Financial Perspective; and (4) Learning and Growth Perspective.

A Study on Production of Broadcasting New Media Style Guide (방송사 뉴미디어 스타일 가이드 제작에 관한 연구)

  • Kim, Kyung-Yoon;Jung, Hoe-Kyung
    • Journal of Digital Convergence
    • /
    • v.12 no.9
    • /
    • pp.379-385
    • /
    • 2014
  • N-Screen era is held due to the cloud computing technology which access to contents anytime, anywhere without any persistent. In the broadcast industry, this broadcast contents is rapidly serviced by variety of media devices such as PC, Smart phone, Tablet, App, IPTV. To Increase the usefulness and usability of the platform, same brand identity have to be maintain by devices and integrated guide which can encompass a variety of media are needed. This study tries to figure out the need of New Media Style Guide to keep brand identity in a variety of new media beyond previously Web style guide which limited in the Web pages. First, Integrated Guide GEL of BBC's and Web style guide of KBS was analyzed. Through the analysis it was found that the limitations and problem of the current web style guide and then suggested the improvement direction. In addition, this study tried to find which design elements should be made for new media style guides through in-depth interview with practitioners who work in broadcast media industry for more than three years. Through the research it was understood the current status of integrated brand identity and found a way to improve forward to new media platforms of KBS.

A National Survey on the Prevalence and Risk Factors of Child Sexual Abuse (아동기 성학대 발생과 배경요인)

  • Han, In-Young;Lee, Yong-Woo;Yoo, Seo-Koo;Park, Myung-Sook;Kim, Jin-Sook
    • Korean Journal of Social Welfare
    • /
    • v.60 no.2
    • /
    • pp.131-153
    • /
    • 2008
  • Based upon the first national sample of adult men and women, the study aims to examine the prevalence of chid sexual abuse in Korea and factors related to the incidence of child sexual abuse. The results of the study show that 20.8% of the sample experienced one or more types of sexual abuse in their childhood, which indicates that Korean society is not any longer immune to child sexual abuse. With regard to how to cope with sexual abuse, "not informed to anyone and did not get any help at all" is the most major one for all types of sexual abuse. Even those who got help were reported to depend heavily upon private routes such as parents, relatives, or friends, indicating the urgency of establishing systematic intervention schemes for the problem. The results of a logistic regression analysis show that gender of the child, involvement in delinquent behaviors, economic status of the family, number of siblings, and residence in high-crime region are significantly related to the incidence of child sexual abuse. These results of the study would be expected to provide a useful guideline for developing policies or intervention programs aimed to prevent or address child sexual abuse.

  • PDF

Utility of Climate Model Information For Water Resources Management in Korea

  • Jeong, Chang-Sam
    • Journal of the Korean Society of Hazard Mitigation
    • /
    • v.8 no.6
    • /
    • pp.37-45
    • /
    • 2008
  • It is expected that conditions of water resources will be changed in Korea in accordance with world wide climate change. In order to deal with this problem and find a way of minimizing the effect of future climate change, the usefulness of climate model simulation information is examined in this study. The objective of this study is to assess the applicability of GCM (General Circulation Model) information for Korean water resources management through uncertainty analysis. The methods are based on probabilistic measures of the effectiveness of GCM simulations of an indicator variable for discriminating high versus low regional observations of a target variable. The formulation uses the significance probability of the Kolmogorov-Smirnov test for detecting differences between two variables. An estimator that accounts for climate model simulation and spatial association between the GCM data and observed data is used. Atmospheric general circulation model (AGCM) simulations done by ECMWF (European Centre for Medium-Range Weather Forecasts) with a resolution of $2^{\circ}{\times}2^{\circ}$, and METRI (Meteorological Research Institute, Korea) with resolutions of $2^{\circ}{\times}2^{\circ}$ and $4^{\circ}{\times}5^{\circ}$, were used for indicator variables, while observed mean areal precipitation (MAP) data, discharge data and mean areal temperature data on the seven major river basins in Korea were used for target variables. The results show that GCM simulations are useful in discriminating the high from the low of the observed precipitation, discharge, and temperature values. Temperature especially can be useful regardless of model and season.

Bearing Capacity Analyses of Shallow Foundations in Reinforced Slopes

  • Kim, Hong-Taek;Choi, In-Sik;Sim, Young-Jong
    • Geotechnical Engineering
    • /
    • v.12 no.3
    • /
    • pp.127-148
    • /
    • 1996
  • Recently, foundations of heavy structures such as bridge abutments have been built on slopes or near the crest of slopes at an increasing rate. Because the bearing capacity of such foundations is considerably lower than the bearing capacity of the same soil on a level ground, deep footings such as piles and caissons are often used. However, the costs of such methods are generally very high. One of the new techniques to overcome the problem is to place reinforcing members such as geosynthetics or metal strips horizontally at some depths beneath the footings. Rational methods of analysis to predict the bearing capacity of footings in reinforced slopes are therefore needed. This paper proposes an analytical method for estimating the increase in bearing capacity gained from the included horizontal strips or ties of tensile reinforcing in the foundation soil below the footing built near the crest of a slope. A failure mechanism, including the concept of'wide slab effect', adopted in the present study for analyzing the bearing capacity of foundations in reinforced slopes, is established through the observed model test behaviors described by Binquet SE Lee and Huang et al, and the Boussinesq solutions. The analytical results are then compared with the experimental data described in the paper by Huang et al. Also in order to properly evaluate the soil reinforcement interaction, typical pullout test values of the apparent friction coefficient, which usually vary with depths owing to both the increase of the shearing volume and the increase in local stress caused by soil dilatancy, are analyzed and related functionally. Furthermore, analytical parametric studies are carried out to investigate the effect and significance of various pertinent parameters associated with design of reinforced slope foundations. Keywords : Bearing capacity, Reinforced slope, Slab effect, Friction coefficient.

  • PDF

A Study on Pseudolite-augmented Positioning Method for Automatic Docking (자동접안을 위한 의사위성 보강 측위기법에 관한 연구)

  • Park, Sang-Hyun;Cho, Deuk-Jae;Oh, Se-Woong
    • Journal of Navigation and Port Research
    • /
    • v.30 no.10 s.116
    • /
    • pp.839-845
    • /
    • 2006
  • A laser docking system provides a centimeter-level accuracy distance from jetty mounted laser sensors in order to help a vessel to approach to a pier. It is very accurate & useful, whereas there are too many considerable problems. Laser sensors of the laser docking system need to be correctly positioned and installed on a jetty to allow for full range of vessels to be berthed and to consider loading condition and tidal variations. Above all, the laser docking system is expensive and its service coverage is limited. In order to solve these problems, CDGPS positioning method using GPS satellites has been proposed. This paper presents that, through RHDOP simulation, the previous CDGPS positioning method using only GPS satellites is not able to provide the continuous service with centimeter-level positioning accuracy. And this paper proposes a pseudolite-augmented positioning method for vessel docking in order to solve the problem of the continuous service on the previous CDGPS positioning method. In this paper, pseudolite is used to aid in CDGPS positioning. This paper shows that the proposed method can provides the continuous service through comparison analysis of RHDOP simulation results between the GPS satellite constellation and the pseudolite-augmented GPS satellite constellation. Furthermore, it is shown that the proposed positioning method satisfies the positioning performance required for vessel automatic docking at a test bed designed for performance evaluation.

Selection of Retaining Wall System for Underground Parking Lots Expansion of Apartments (거주중 공동주택의 지하주차장확대를 위한 흙막이공법 선정)

  • Ro, Young-Chang;Lee, Chan-Sik
    • Korean Journal of Construction Engineering and Management
    • /
    • v.9 no.2
    • /
    • pp.99-107
    • /
    • 2008
  • Rapidly increasing automobile supply rate according to improved economic level of life makes lack of parking space of apartments. Even though the initial design of parking space compiled with old regulations, it may not observe either new laws or requirement of inhabitants. Even if old apartments have no structural durability problem, outworn facilities and insufficient parking area may be a main reason for reconstruction. It causes waste of national resources and makes recycling issues. Additionally, irregularly parked cars make traffic obstruction to a fire engine and result in many fire accident victims. Parking problems of apartments are not only inconvenience but also serious safety issues. From these points of view, remodeling only for parking area expansion is necessary to avoid overall reconstruction of apartments. The purpose of this study is to suggest a retaining wall selection method for apartments underground parking lots expansion without evacuation of resident people. Effect factors to select retaining wall system are analyzed and weight values are calculated by applying AHP. One selection method of retaining wall is proposed by evaluating applicability and its sensitivity analysis is executed. This selection method is expected to help decision-making of retaining wall system selection.

Purification and Identification of Apoptosis Modulator Pipernonaline from Piper longum Linn. against Prostate Cancer Cells (필발(Piper longum Linn.)로부터 전립선암 세포사멸물질 pipernonaline의 분리 및 동정)

  • Kim, Kwang-Youn;Kim, Yun-Jin;Lee, Wan;Yu, Sun-Nyoung;Cho, Hyo-Jin;Lee, Sun-Yi;Lee, Han-Seung;Sohn, Jae-Hak;Oh, Hyuncheol;Ahn, Soon-Cheol
    • Journal of Life Science
    • /
    • v.19 no.5
    • /
    • pp.671-675
    • /
    • 2009
  • Prostate cancer has been a critical health problem due to an increase of prostate cancer-related deaths worldwide. Also, a frequent treatment option for prostate cancer is androgen ablation, but this treatment has a limited scope, especially for hormone-refractory cancer. There is an urgent need for the identification of alternative therapeutic strategies for prostate cancer. Previously, over one hundred species of dried-plant methanol extracts were tested for inhibitory effects on proliferation. One of them, Piper longum Linn. was selected based on its potent anti-proliferation effect. The dried root of P. longum Linn. was extracted with 100% methanol for 2-3 days and its extract was fractionated using chloroform. The chloroform layer was then subjected to column chromatography on silica gel, reverse phase-18 (RP-18) and Sephadex LH-20, in turn. Finally, the pure compound was obtained and identified as pipernonaline by NMR spectroscopic and physico-chemical analysis. In this study, anti-proliferation and cell cycle arrest effects of pipernonaline on human prostate cancer PC-3 cells were investigated using the MTT and PI staining, respectively. Our findings suggest that pipernonaline represents a dose-dependent growth inhibition pattern on PC-3 cells and, moreover, its growth inhibition is associated with sub-G1 and G0/G1 cell cycle accumulation in PC-3 cells. Also, these results provide an anticancer candidate for human prostate cancer.

Factors affecting the turnover intention of Industrial Accident Hospital Employees by Job Category (산재병원 구성원들의 직종별 이직의사에 관련된 영향요인)

  • Bang, Yong-Joo
    • Korea Journal of Hospital Management
    • /
    • v.8 no.3
    • /
    • pp.92-117
    • /
    • 2003
  • The purpose of this study was to analyze the characteristics of socio-demographic, organizational conflict and job satisfaction, and to examine the interrelation of influential factors in the intention of turnover. The data for this study were collected through a self-administrated survey with a structured questionnaire to 1,027 subjects from several medical doctor staff members, nursing staff members, administration staff members, pharmacist, and technical expert of eleven hospitals. The data were collected by self-reporting questionnaire from July 29 to September 7, 2002. In this analysis frequency test, t-test, ANOVA, multiple regression were used. The main results of this research is as following; 1. According to socio-demographic characteristics of the respondent's level of the intention of turnover was higher in a doctor staff members than others, for females than males, and had worked for 5-10 years in hospitals. Also, the intent to turnover was generally higher younger workers than long terms workers. 2. According to the organizational conflict characteristics as the respondents who got less conflict experience in the organization, their level of the intention of turnover was higher. And, technical conflict experiences were expressed greater than hierarchical conflict experiences. 3. According to the job satisfaction characteristics as his or her satisfaction that is about the promotion, working itself, salary, and fellowship in the organizational was higher, the level of the intention of turnover was lower. 4. According to the result of Multiple Regression for the doctor staff members in general hospitals rather than special hospitals was negatively correlated with the satisfaction of working itself while hierarchical conflict factors in the organizational conflict characteristics was positively correlated with the intention of turnover. For the nursing staff members the job satisfaction for the working itself, salary were negatively correlated with the intention of turnover. For the administration staff members as the job satisfaction for the working itself was negatively correlated with the intention of turnover. For medical and pharmacy staff members as more working experience, correlation with the intention of turnover was negative. Besides, as the job satisfaction for the working itself and the fellowship was negatively correlated with the intention of turnover. For the skill and technicians, the job satisfaction for the working itself, promotion were negatively correlated with the intention of turnover. The above indicate that job satisfaction and promote their ability and form a good relationship with organization members were very important to decrease the intention of turnover. This study identified the major effective factors of the intention of turnover and analyzed the differences among the job category. In that respect, it is significant for the study to be able to provide a reference for managing hospital of industrial accident and organizational development. However, this study has a problem, which is not to identify a valuable model for examining the relationship between organizational factors such as organizational conflict, job satisfaction, and intention of turnover. Therefore, further study is needed and strengthened in the field of intention of turnover for hospital for industrial accident.

  • PDF