• KIEAE Journal
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• 제15권2호
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• pp.117-122
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• 2015

Purpose: Generally, 30% of the total energy consumption in office building is used for artificial indoor lightings, and almost 75-85% of electric power in fluorescent and Light-Emitting Diode (LED) lightings can be dissipated as a form of heat into indoor environment. The heat generated by indoor lightings can cause the increase of cooling load in office buildings. Thus, it its important to consider indoor lightings as a heat and light source, simultaneously. Method: In this study, we installed two kinds of indoor lightings including fluorescent and LED lightings and measured surface temperature of both indoor lightings. In addition, we obtained ambient temperature of indoor space and finally calculated total heat dissipated from plenum area and surface of lightings. Result: Total indoor heat gain was 87.17Wh and 201.36Wh in cases of six 40W-LED lightings and 64W-fluorescent lightings, respectively.

• 한국콘텐츠학회논문지
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• 제13권9호
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• pp.49-57
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• 2013

최근 스마트폰의 발전에도 불구하고 통화 녹취 기술은 대부분 사내 유선망을 이용하여 통화내용을 서버에 저장, 검색 및 청취할 수 있도록 되어 있다. 따라서 본 논문은 스마트폰의 장점인 이동성을 활용하여 모바일간의 통화 및 모바일과 유선상의 통화내용을 녹취할 수 있는 안드로이드 기반의 스마트폰 레코딩 시스템을 소개한다. 스마트폰 레코딩 시스템은 어플리케이션이 설치된 스마트폰을 이용하여 통화가 이루어지면 단말기에 통화내용을 저장하고 사용자 권한에 의해 암호화되어 웹 서버에 업로드 할 수 있다. 업로드된 녹취 데이터는 웹을 통하여 관리할 수 있다. 이 시스템을 통하여 이동 업무에 적용가능하고 증거자료 확보 및 보이스 피싱과 같은 범죄를 예방하는데 활용될 수 있을 것이다.

• 설비공학논문집
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• 제21권1호
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• pp.63-70
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• 2009

The air sterilization systems are investigated experimentally in this paper. The goal is to reduce bacteria, mold and viruses in office air by using a UV sterilizer installed inside a partition panel and wall-mounted unit. These systems allow occupants to turn the system on/off and to control the incoming air speed and direction. The partition air sterilization system conditions and sterilizes the air, and then delivers the clean air into the personal task area through the partition panels, which are connected to the pressurized under-floor plenum. Room air exits through the return grills mounted on the ceiling. The wall-mounted air sterilization system sterilizes the air, and then delivers the clean air to the personal task area from the wall. In this study a full-size experimental environment is established to investigate the immunization performance of these air sterilization systems. A typical office space scale is used in this study in order to find an optimal system to achieve a sterilized healthy micro-environment. Multiple system parameters, including volume flow rate and velocity of supplied air, were regulated during the experiments. The more air contact these air sterilization systems had, the better disinfection performance. Over 90% of eradication ratios were obtained by these two air sterilization systems. The results indicate that these systems can efficiently disinfect office air contamination.

• Wind and Structures
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• 제29권3호
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• pp.209-223
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• 2019

The assessment of wind-induced vibration for tall reinforced concrete (RC) buildings requires the accurate estimation of their dynamic properties, e.g., the fundamental vibration periods and damping ratios. In this study, RC frame-shear wall systems designed under gravity and wind loadings have been evaluated by utilising 3D FE modelling incorporating eigen-analysis to obtain the elastic periods of vibration. The conducted parameters consist of the number of storeys, the plan aspect ratio (AR) of buildings, the core dimensions, the space efficiency (SE), and the leasing depth (LD) between the internal central core and outer frames. This analysis provides a reliable basis for further investigating the effects of these parameters and establishing new formulas for predicting the fundamental vibration periods by using regression analyses on the obtained results. The proposed constrained numerically based formula for vibration periods of tall RC frame-shear wall office buildings in terms of the height of buildings reasonably agrees with some cited formulas for vibration period from design codes and standards. However, the same proposed formula has a high discrepancy with other cited formulas from the rest of design codes and standards. Also, the proposed formula agrees well with some cited experimentally based formulas.

• 인간식물환경학회지
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• 제23권2호
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• pp.201-210
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• 2020

The purpose of this study was to determine the effects of flower decorations on job stress and stress copying style of police officers. Flower decorations were done in the form of "one-table one-flower", in which flowers were placed on each desk in the office space. By analyzing color psychology, we first identified the symbolism of color, and selected the cut flowers in the same color. We selected six types of flowers in six colors: red, orange, yellow, green, blue and purple. Each Monday morning, the flower decorations were delivered to the police station. We selected 50 subjects who wanted to keep flowers on their desks every week as the experimental group and 44 subjects who only wanted to participated in the assessment as the control group. Before and after the program, we examined the mean difference between the control group and experimental group. After six sessions of the program, there was a significant difference in job stress (p < .001) and stress copying style (p = .049) of the experimental group compared to the control group. Therefore, this study proved that having flower decorations in an office space is effective for the psychological stability of police officers that are highly stressed, due to sensory stimulations from the colors and scents of flowers as well as mutual interaction as they take care of the flowers.

• 조명전기설비학회논문지
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• 제17권2호
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• pp.1-9
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• 2003

본 연구는 공간 특성이 서로 다른 주거공간과 사무공간의 조명환경 평가구조에 어떠한 차이가 있는지를 파악하고, 분위기항목과 행위항목과의 관계를 정립하는데 목적을 두고 먼저 조명환경에 대한 평가항목으로써 20개의 분위기항목과 15개의 행위항목을 선정하였다. 그리고 SD법에 의한 주관평가실험을 실시하였다. 그 결과, 공간의 특성이 달라도 조명환경의 분위기평가는 <활동성>, <안정감>, <고급감>의 3인자로 설명이 가능한 것으로 나타났다. 행위 인자에 있어서는 주거공간의 경우 <작업행위>,<휴식행위>,<오락행위>의 3인자가 추출되었고, 사무공간의 경우 <작업행위>, <비작업행위>의 2인자가 추출되었다. 주거공간에서의 3가지 행위인자를 설명하는데 있어서 가장 커다란 영향을 미치는 분위기인자는 <활동성>인자로 나타났으며, 사무공간의 경우, <작업행위>는 <활동성>인자가, <비작업행위>는 <고급감>인자가 가장 큰 영향을 미치고 있는 것으로 나타났다.

• Safety and Health at Work
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• 제6권1호
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• pp.56-61
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• 2015

Frozen food processing workers work under a cold environment which can cause several adverse health effects.This study explored factors affecting workers' health in the frozen food industry in Thailand. Participants comprised 497 workers exposed to a cold working environment and 255 office workers who served as the controls. Data were collected by a survey on the work environment, and the interview of workers for abnormal symptoms. The exposed group had the following characteristics: 52.7% male, overall average age of 27 (SD 6.6) years old, attained elementary education (Grade 4 and Grade 6) (54.1%), married (48.9%), smokers (21.3%), alcohol consumption (31.0%), duration of work was between 1 and 5 years (65.2%), working 6 days a week (82.7%), 1-5 hours of overtime per week (33.8%), office workers (33.9%); work category: sizing (6.9%), peeling (28.3%) dissecting (22.2%), and in the warehouse (8.6%). The temperature in the work environment ranged from $17.2^{\circ}C$ to $19.2^{\circ}C$ in most sections, $-18.0^{\circ}C$ in the warehouse, and $25^{\circ}C$ in the office areas. Warehouse workers had more abnormal symptoms than controls including repeated pain in the musculoskeletal system (OR 11.9; 95% CI 6.12-23.45), disturbance throughout the body (OR 4.60; 95% CI 2.00-10.56), respiratory symptoms (OR 9.73; 95% CI 3.53-26.80), episodic finger symptoms (OR 13.51; 95% CI 5.17-35.33). The study results suggest that workers' health should be monitored especially with regard to back and muscle pain, respiratory symptoms, episodic finger symptoms, and cardiovascular symptoms. Health promotion campaigns such as antismoking and reduction of alcohol consumption should be established because smoking and alcohol consumption are contributing factors to the pathogenesis of Raynaud's phenomenon and peripheral vascular disorders such as hypertension and heart disease.

• 한국항행학회논문지
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• 제22권6호
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• pp.557-565
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• 2018

도심환경에서의 GNSS 항법을 위하여 짧은 지연 다중경로 감쇄 기법을 제안하였다. 제안한 기법은 GNSS 수신기가 육상 교통 이동체에 탑재되어 있다는 제한 조건을 이용하여 어느 위성에서 다중경로 신호가 발생했는지를 검출하고, 해당위성의 측정치를 제거하여 새로운 항법결과를 도출한다. 이때 검출 조건은 GNSS 수신기의 성능 등급과 이동체의 동적 특성에 따라 결정된다. 제안 기법을 검증하기 위하여 4가지 시나리오에 대한 다중경로 환경에서 실제 데이터를 수집하였으며, GNSS 수신기에 기본적으로 탑재된 다중경로 감쇄 기법과 제안한 기법을 함께 적용하여 데이터를 처리한 결과 가시위성이 5개 미만인 경우를 제외하고는 측위 결과가 5 m 이하로 나타나는 것을 확인하였다.

• 한국대기환경학회지
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• 제27권2호
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• pp.214-224
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• 2011

• 농촌지도와개발
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• 제2권1호
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• pp.61-70
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• 1995

The decentralization of local extension authority is due to several aspect of improper law on extension. First, extension authority has not treated the extension law properly though it has many local office in province, counties, villages. Second, the authority concentrated too much on the service ignoring the local offices are under the improper law. Third, the authority lost their dignity when other institutions argue for their work on the extension services, Extension Institution should change, but the change should come with proper law environment.