• Title, Summary, Keyword: JDI

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A Transparent Monitor Based on JDI for Scalable Race Detection of Concurrent Java Programs (병행 Java 프로그램의 확장적 경합탐지를 위한 JDI 기반의 투명한 감시도구)

  • Kim, Young-Joo;Kuh, In-Bon;Bae, Byoung-Jin;Jun, Yong-Kee
    • The KIPS Transactions:PartA
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    • v.16A no.2
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    • pp.55-60
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    • 2009
  • Race conditions in current Java programs must be detected because it may cause unexpected result by non-deterministic executions. For detecting such races during program execution, execution flows of all threads and all access events can be monitored. It is difficult for previous race detection techniques to monitor all threads and access events in actuality because these techniques analyze the files traced during program execution or modify original source programs and then monitor these programs. This paper presents a transparent scalable monitoring tool to detect races using JDI(Java Debug Interface) where JDI is 100% pure java interface to provide in JDPA(Java Platform Debugger Architecture) and is able to provide information corresponding to events occurred in run-time of programs. This tool thus can monitor execution flows of all threads and all access events without program modification. We prove transparency of the presented tool and grasp the efficiency of it using a set of published benchmark programs. As a result of this, the suggested tool can monitor all threads and accesses of these programs without their modification, and their monitoring time is increased to more than 20 times.

An Application of Drought Severity-Area-Duration Curves Using Copulas-Based Joint Drought Index (Copulas 기반의 결합가뭄지수를 이용한 가뭄심도-영향면적-지속기간 곡선의 적용)

  • Ryu, Jung Su;Ahn, Jaehyun;Kim, Sangdan
    • Journal of Korea Water Resources Association
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    • v.45 no.10
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    • pp.1043-1050
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    • 2012
  • In this study, drought Severity-affected Area-drought Duration (SAD) curves are analyzed in order to examine temporal and spatial behavior of drought. A copulas-based joint drought index which is studied recently is applied to express the severity of drought. JDIs across the country with 60 points are calculated monthly basis, and using EOF and Kriging techniques, locational JDIs are spatially extended into gridbased JDIs with spatial resolution of $10{\times}10$ km. JDIs by lattice is analyzed by drought duration and by affected area, and JDI-based SAD curves are created to represent Korean historical drought events. Though created curves, drought events that occurred in the past in our country can be spatially and temporally characterized. In addition, curves are expected to contribute to determine the exact situation on the current drought condition have an impact to some extent.

Effects of a Self-Stretching Exercise Program on Musculoskeletal Symptom for Care Workers

  • Wang, Joong-San;Lee, Sang-Min;Kim, Ji-Sung;Kim, Hong-Rae;Park, Si-Eun;Park, Joo-Hyun;An, Ho-Jung;Moong, Ok-Kon;Kim, Soon-Hee
    • Journal of International Academy of Physical Therapy Research
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    • v.3 no.1
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    • pp.356-363
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    • 2012
  • This study was carried out to identify how a self-stretching exercise program affects pain for each body area, pain relief and job satisfaction for care workers. 20 of 40 care workers with musculoskeletal symptom were randomly selected and participated a self-stretching exercise program consisting of 15 motions. The intervention was done five times or more per weeks for 8 weeks and 1 session lasted within 15 minutes. 'Musculoskeletal symptom survey table' of the Korea Occupational Safety and Health Agency(KOSHA) and JDI(Job Descriptive Index) was used for pain on the musculoskeletal symptom and job satisfaction. Survey were done twice before and after the program. The result of this study showed that self-stretching exercise program group(SSPG) relieved from pain significantly in the shoulders(p<.01) and lumbar(p<.05), comparing to the non self-stretching exercise program group(NSPG). Although no significant difference on variations in the JDI appeared in SSPG, the significant reduction appeared from the colleague relationship and organization in NSPG(p<.05). SSPG showed the significant increase on variations in JDI from the job and organization comparing to NSPG. Especially, the improvement on satisfaction for the organization was shown(p<.05). Accordingly, the self-stretching exercise program for care workers can be said to positively affect the overall pain relief and increase on the JDI.

Job Satisfaction of Employees in F&B Department: Domestic Independent Deluxe Hotel vs. International Chain Deluxe Hotel (국내 비체인 특급 호텔과 외국계 체인 특급 호텔 조리.식음료 종사원의 직무만족도 비교 분석)

  • Lee, So-Jung;Myung, Me-Sun;Yang, Il-Sun;Lee, Hae-Young
    • Journal of the Korean Society of Food Culture
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    • v.21 no.1
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    • pp.42-50
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    • 2006
  • The purposes of this study were to measure the job satisfaction levels of F&B(Food & Beverage) personnel in hotel by using JDI(Job Descriptive Index), to investigate relationships between demographic variables or job type and job satisfaction, to determine the relative importance of the five facets and to identify the effects of job satisfaction on turnover intention by hotel. Questionnaire was developed and distributed to 660 employees who are currently working in food & beverage department of hotel A (Domestic independent deluxe hotel) and hotel B(international chain deluxe hotel). A total of 498 questionnaires were usable; resulting in 75.5% response rate. The survey was conducted between March 16 to 27, 2000. As a result of analysis on job satisfaction, total JDI score was 136.57 out of full mark 210. Personnel of Hotel A was more satisfied significantly with work itself (p<.01), supervision (p<.001), co-worker (p<.01), total JDI (p<.001) than those of hotel B. Total JDI and work itself score were higher on employees of front of the house than those of back of the house in both of hotels. Payroll was the most important facet on job satisfaction. Finally, work itself (p<.001) and payroll (p<.05) had a significant effect on turnover intention in hotel A and work itself (p<.001), supervision (p<.05) and promotion (p<.05) did in hotel B. The findings indicated the necessity of human resource management apt to the vision of enterprise and the organizational culture.

The relationship between job satisfaction and intention to quit of employees in F&B department of hotels by job type (직무 유형에 따른 특급호텔 조리ㆍ식음료 종사원의 직무만족도가 이직의사 견해에 미치는 영향 분석)

  • 양일선;명미선;이소정;이해영
    • Korean journal of food and cookery science
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    • v.20 no.2
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    • pp.151-157
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    • 2004
  • This study was designed firstly to measure the job satisfaction levels of F&B (Food & Beverage) personnel in hotels by using JDI (Job Descriptive Index) and secondly to identify the effects of job satisfaction on intention to quit by job type. Of 498 respondents, there were 245 employees in the back of the house (eBOH) and 253 in the front of the house (eFOH). From an analysis on job satisfaction, total JDI, score was 136.57${\pm}$11.48 out of a maximum 210 and the payroll (14.79 out of 21, 70.4%) facet of JDI was the highest job satisfaction followed by co-workers (36.07 out of 54, 66.8%), supervision (35.37 out of 54, 65.5%), promotion (17.45 out of 27, 64.6%) and work itself (32.86 out of 54, 60.8%). In comparison between the job satisfaction of eBOH and eFOH, eFOH perceived significantly higher than eBOH for job itself (p<.001) and total job satisfaction (p<.01). No facets of JDI were significant by job level, but work itself (p<.05), payroll (p<.05), supervision (p<.01) and promotion (p<.05) were significant by work section in eFOH,. In addition, no facets except work itself were significant by either job level or work section in eFOH. Finally, among job satisfaction facets, payroll had a negative effect on intention to quit whereas supervision had a positive effect on it in eBOH. On the other, work itself affected intention to quit positively but promotion affected it negatively. The findings confirmed the necessity for internal marketing focusing on the lower level of job satisfaction facets and indicated that such a focus would improve organizational effectiveness.

Assessment of 12-hour Shift-worker's Job Satisfaction in Manufacturing Industry (제조업에 종사하는 2교대근무 작업자의 직무만족도 평가)

  • Kim, Dae-Ho;Park, Keun-Sang
    • Journal of the Ergonomics Society of Korea
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    • v.26 no.1
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    • pp.55-61
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    • 2007
  • The purpose of this study is to assess the welfare level for shift workers by means of their satisfactions to the jobs in manufacturing environment. As a measurement tool of job satisfaction, we use the JDI(Job Descriptive Index) which can ensure reliability and are widely used. Measurement factors are investigated by means of the duty, payment, promotion, supervisor, co-workers, and general job satisfaction of shift workers. For the application of job satisfaction, 109 workers, 12-hour shift workers in domestic five companies related with manufacturing industry are considered. They treat general facilities in night shift work. The result of this study may be used as a strategic data of welfare policy for improving the welfare level of shift workers.

Foodservice Employee Job Satisfaction in 14 Hospital Food Service Systems (병원 급식종사원의 직무만족도에 관한 연구)

  • Hong, Wan-Soo
    • Korean journal of food and cookery science
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    • v.10 no.3
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    • pp.296-300
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    • 1994
  • Recently hospital food service systems are often burdened with labour problems including employee job dissatisfaction, high labour costs and turn over. It is essential that these factors should be considered in developing for assuring palatable, nutritious, and safe feeding. A survey of 14 hospital conventional food service systems was undertaken and detailed information was collected from 390 catering staff. Foodservice employee satisfaction was evaluated by measuring employee job attitudes towards five aspects of their job using the Job Description Index(JDI). The food serive workers surveyed in this research were less satisfied with their jobs than are other types of workers in other industries. The demographic variables including age, length of employment and kinds of work were significantly related to job satisfaction. It was also found that catering staff in 14 hospitals surveyed were more satisfied with their interpersonal relations with supervisions and co-workers than with work content, pay and promotional opportunities.

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Factors Affecting the Dishwashing Workers′ Job Satisfaction in Hospital Foodservice Systems (병원급식 식기세정 작업원의 직무만족도에 영향을 미치는 요인)

  • 박정순
    • Korean journal of food and cookery science
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    • v.13 no.4
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    • pp.402-409
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    • 1997
  • Understanding the satisfaction and dissatisfaction of employees has been deemed important for smooth and efficient food service management. The aim of this study was to examine the relationship between the dishwashing employees' job satisfaction and the operational and managerial factors in hospital foodservice systems. A survey of twenty conventional hospital food service systems was undertaken and detailed information was collected from 280 dishwashing employees through mailed questionnaires. Dishwashing employees' satisfaction was evaluated by measuring their job attitudes towards four aspects of their job using the modified Job Description Index (JDI). Descriptive analysis and Pearson product moment correlation analysis were used to analyze the data. The dishwashing workers were found to be more satisfied with their interpersonal relations with co-workers than with work content, pay or promotional opportunities. The demographic variables including education, type of employment and work experience were significantly related to job satisfaction. As the ratio of supervisors to dishwashing workers increased, the degree of satisfaction in dishwashing workers increased significantly.

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Light-Weight Recovery Utilities for Seamless Service in Ubiquitous System (유비쿼터스 시스템의 중단 없는 서비스를 위한 경량화된 결함복구 유틸리티)

  • Hyun Jae-Myung;Choi Chang-Yeol;Kim Sung-Soo
    • Proceedings of the Korean Information Science Society Conference
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    • pp.193-195
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    • 2006
  • 유비쿼터스 시스템(Ubiquitous System)이 가지는 특징인 무선 네트워크, 제한된 자원 등으로 인하여 결함이 발생할 가능성이 높다. 이런 상황에서 결함이 발생하여도 계속적으로 사용자에게 서비스를 제공하기 위해서는 결함 복구방법이 필요하며 가장 많이 쓰이는 방법으로는 마이그레이션(Migration)이 있으나 마이그레이션 자체가 가지는 오버헤드(Overhead)로 인하여 유비쿼터스 시스템에서는 사용하기 어려운 문제점을 가지고 있다. 본 논문에서는 이러한 문제점을 해결하기 위하여 경량화되어 시스템에 적은 오버헤드를 가지며 빠르게 결함을 복구할 수 있는 AHU(Autonomic Healling Utilites)를 개발하였다. AHU는 AHUServer, AHUClient, AHUBackup으로 구성되어 있으며 JDI(Java Debugging Interface)를 사용하여 사용자 어플리케이션(Application)의 필요 정보만을 추출하여 저장하고 최소한의 노력으로 사용자 시스템 또는 어플리케이션에 결함이 발생하여도 사용자의 통제없이 빠른 시간내에 서비스가 중단된 시점부터 계속적으로 서비스를 제공한다.

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A Transparent Monitor for Filtering Access Events to Shared Variables in Concurrent Java Programs (병행 Java 프로그램의 공유변수 접근사건 선택을 위한 투명한 감시도구)

  • Kuh, In-Bon;Kim, Young-Joo;Kang, Moon-Hye;Jun, Yong-Kee
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.648-652
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    • 2007
  • 병행 Java 프로그램의 경합은 프로그램의 비결정성을 초래하므로 반드시 탐지되어야 한다. 이러한 경합을 수행 중에 탐지하기 위해서는 모든 접근사건들을 감시할 수 있어야 한다. 기존의 경합탐지 기법들은 대상 프로그램을 수정하여 감시하므로 모든 감시지점을 인식하는 것은 현실적으로 어렵다. 본 연구에서는 JDI (Java Debug Interface)를 이용하여 모든 접근사건을 감시하여 선택할 수 있는 투명한 감시도구를 제안한다. 그리고 벤치마크 프로그램을 이용한 실험결과를 분석하여 투명성을 보인다.

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