Seismic responses due to the dynamic coupling between a primary structure and secondary system connected to a structure are analyzed in this study. The seismic responses are compared based on dynamic coupling criteria and according to the error level in the natural frequency, with the recent criteria being reliant on the error level in the spectral displacement response. The acceleration responses and relative displacement responses of a primary structure and a secondary system for a coupled model and two different decoupled models of two degrees-of-freedom system are calculated by means of the time integration method. Errors in seismic responses of the uncoupled models are reduced with the recent criteria. As the natural frequency of the secondary system increases, error in the natural frequency decreases, but seismic responses of uncoupled models can be underestimated compared to that of coupled model. Results in this paper can help determine dynamic coupling and predict uncoupled models’ response conservatism.

목적 : 본 연구에서는 체계적 고찰을 통해 조현병 환자의 실행기능 향상을 위한 작업치료 중재 방법 및 효과를 알아보고자 하였다. 연구방법 : 2007년 1월부터 2018년 12월까지 ScienceDirect, Pubmed와 CINAHL에 등재된 논문 중 ‘schizophrenia’, ‘occupational therapy’, ‘executive function’으로 자료를 검색하였다. 그 중 조현병 환자를 대상으로 작업치료 중재를 적용한 10편의 연구를 선정하여 분석하였다. 결과 : 선정된 10편의 연구에서 작업치료 중재 종류는 작업치료 훈련중재, 물건 구매하기 훈련중재, 인지 훈련중재, 직업훈련 프로그램 중재의 네 가지로 분류하였다. 이러한 중재들은 방법과 목적에 따라 실제 일상생활의 수행도, 실행기능, 전반적인 인지 그리고 심리사회적 기능에 대한 향상에 효과가 있는 것으로 나타났다. 종속변인은 인지기능, 실행기능, 수단적 일상생활활동, 쇼핑 등의 순서로 높은 빈도를 나타내었고, 10편의 연구에서 총 38개의 평가도구가 사용되었으며, 대부분 인지기능을 확인하기 위한 도구들이었다. 결론 : 본 연구를 통하여 지역사회 내 조현병 환자의 실행기능 향상을 위한 작업치료 중재의 종류와 효과, 종속변인 및 평가 도구에 대해 확인할 수 있었다. 이러한 결과는 작업치료사가 조현병 환자에게 작업치료 중재를 제공할 때 목적에 따라 중재 방법을 선택하는 근거로 활용할 수 있을 것이다.

Recently, the importance of air filters used in air purifiers and ventilation systems is emphasized in Korea. As a result, air filter test reports are required by users to ensure the removal efficiency of particulate matter. However, the tests are conducted for the filter material alone, which lead to a possible discrepancy between the test report and actual efficiency when applied to actual devices. Therefore, in this study, the removal efficiency data of the filter test reports were compared with actual filter efficiency data after application to the ventilation systems for some ventilation systems in the market. For ventilation system A, the field test results using filter leakage test method were slightly lower than those in the test report but nearly the same. For ventilation system B, the field test result was much higher than reported in the test report. This was due to the broad range of particle sizes measured using the filter leakage test method. The field tests using the particle counter method showed that the removal efficiency of ventilation system A for 0.3 μm was under 50% which translates to less than half of those of the filter test reports. For ventilation system B, the removal efficiency was 15%~21%. much lower than reported in the filter test reports. The lower removal efficiencys are mainly assumed to be caused by leakage of the filter installation among other factors. Therefore, the field test methods for the particulate matter removal efficiency of ventilation systems should be established to verify actual efficiency and improve the efficiency in the future.

The purpose of this study is to provision the standard method for ensuring the reliability of measuring indoor air quality in public transportation. The objective is to determine the difference in the measured concentration values according to various conditions. These variables include measurement conditions, measurement equipment, measurement points, and measurement time. The value differences are determined by measuring the PM10 and CO2 concentration of subways, and express buses and trains, which are targets of indoor air quality management. The concentration of CO2 was measured by the NDIR method and that of PM10 was measured by the gravimetric method and light-scattering method. Statistically, the results of the concentration comparison according to the measurement points of the public transportation modes were not significantly different (p > 0.05), and it is deemed that the concentration is not affected by the measurement points. In terms of the concentration analysis results according to the measurement method, there was a difference of the concentration between the gravimetric and light scattering method. In the case of the light scattering method, the concentration differed depending on whether it was corrected with standard particles in the laboratory environment.

한국의 탐사보도 수용자를 설문조사해서 탐사보도 역할 인식, 이용량, 인구사회학적 요인이 비윤리적, 위법적인 탐사보도 취재방법 허용정도에 미치는 영향과 취재의 자유에 대한 인식을 분석하였다. 수용자들은 탐사보도가 사회감시와 정보제공 역할을 한다고 생각하면서도 비윤리적이고 위법적인 취재방법에 대해서는 부정적이어서 언론의 자유는 절대적 자유가 아니라고 인식하였다. 수용자들은 취재방법과 취재목적에 따라 취재의 자유에 차이가 있다고 생각하는 것으로 분석되었다. 취재방법이 개인 프라이버시를 침해할수록 제한적으로 생각하고, 취재목적의 공익성이 높으면 넓게 생각하였다. 수용자들이 사회감시역할을 중시하면 비윤리적이고 위법적 취재방법이라도 수용하였고, 정보제공역할을 중시하면 부정적으로 생각하였다. 탐사보도 이용량은 많은 취재방법에 정적인 영향을 주어서 탐사보도 이용만족도가 높았다. 남성보다는 여성이, 연령과 학력은 낮을수록, 수입은 많을수록 취재방법을 더 허용하였다. 환경과 건강 분야 보도 이용량이 많을수록 취재방법을 더 허용하고, 교육, 정부, 범죄 분야 보도를 많이 이용할수록 부정적이었다. 한국 수용자들은 언론의 환경과 건강 분야 감시를 중시하였다.

The concentrations of volatile organic compounds (VOCs) and odor-inducing substances were measured using selected ion flow tube mass spectrometers (SIFT-MS) and a drone equipped with an air quality monitoring system. SIFT-MS can continuously measure the concentration of VOCs and odor-inducing substances in realtime without any pre-treating steps for the sample. The vehicle with SIFT-MS was used for real-time measurement of VOC concentration at the site boundaries of pollution sources. It is possible to directly analyze VOCs concentration generated at the outlets by capturing air from the pollution sources with a drone. VOCs concentrations of nine spots from Banwol National Industrial Complex were measured by a vehicle equipped with SIFT-MS and were compared with the background concentration measured inside the Metropolitan Air Quality Management Office. In three out of the nine spots, the concentration of toluene, xylene, hydrogen sulfide, and methyl ethyl ketone was shown to be much higher than the background concentration. The VOCs concentrations obtained using drones for high-concentration suspected areas showed similar tendencies as those measured using the vehicle with SIFTMS at the site boundary. We showed that if both the drone and real-time air quality monitoring equipment are used to measure VOCs concentration, it is possible to identify the pollutant sources at the industrial complex quickly and efficiently check sites with high concentrations of VOCs.

Industrial Motors diagnostic equipment is highly dependent on the automation system, so if there are defects in the automation equipment, it can only rely on the operator’s intuitive judgment.To help with intuitive judgment, Park’s Vactor Approach(PVA) represents the current signal as a pattern of circles, so it can tell if a fault occurs when the circle is distorted. However, the failure to judge the degree of distortion of the circle pattern is the basis of the fault, so it will face difficulties. In this paper, in order to compare the faults of PVA, the period of d-axis current of PVA pulsation was mastered, so that two phase differences occurred in the same signal source. Through experiments, it is confirmed that this is a 90 degree cross formation of PVA, which is convenient for judging from the vision that there is no fault, thus helping the operator to make intuitive judgment.

정공 수송 층 (HTL)은 PSC의 효율 및 안정성을 증가시키기 위해 페로브스카이트 태양 전지 (PSC)에서 중요한 역할을 한다. 본 연구에서, 우리는 PSCs에서 HTL 스핀 코팅 및 블레이드 코팅 방법으로 니켈 산화물 구리 산화물 (NiO-CuO) 나노 입자 (NPs) 박막을 준비하였다. 스핀 코팅 및 블레이드 코팅 된 NiO-CuO 필름의 필름 특성은 원자력 현미경 (AFM)을 사용하여 조사하었고, 장치 성능에 대한 효과는 J-V 특성, 양자 효율 및 광 강도의 Voc 의존성을 사용하여 조사하었다. 결과적으로, 스핀 코팅으로 15.28 % 효율, 블레이드 코팅으로 11.18 % 효율을 달성하였다.

There have been a lot of studies in the past for the method of predicting the failure of a machine, and recently, a lot of researches and applications have been generated to diagnose the physical condition of the machine and the parts and to calculate the remaining life through various methods. Survival models are also used to predict plant failures based on past anomaly cycles. In particular, special machine that reflect the fluid flow and process characteristics of chemical plants are connected to hundreds or thousands of sensors, so there are not many factors that need to be considered, such as process and material data as well as application of derivative variables. In this paper, the data were preprocessed through time series anomaly detection based on unsupervised learning to predict the abnormalities of these special machine. Next, clustering results reflecting clustering-based data characteristics were applied to produce additional variables, and a learning data set was created based on the history of past facility abnormalities. Finally, the prediction methodology based on the supervised learning algorithm was applied, and the model update was confirmed to improve the accuracy of the prediction of facility failure. Through this, it is expected to improve the efficiency of facility operation by flexibly replacing the maintenance time and parts supply and demand by predicting abnormalities of machine and extracting key factors.

Under the situation which customer orders are cancelled unless all products in the order are delivered all at once, this paper concentrates on the purchase dependent demands and explores the systematic approach to implant the purchase dependence into the multi-product inventory model. First, by acknowledging that it is a challenging task to formulate a suitable inventory model for the purchase dependence, we derive the optimal solution condition using an EOQ model and extend the optimal solution condition to periodic review models. Then, through the comparison simulation of four inventory policies regarding several degrees of purchase dependence, we demonstrate that the inventory models which consider the purchase dependence generate less total cost than the inventory models which ignore the purchase dependence. In general, the inventory models which consider the purchase dependence reduce the loss of sales by maintaining more inventories, which results in reducing the total cost. Consequently, the simulation result supports the effectiveness of this paper’s approach. In addition, this paper uses the individual order period and joint order period obtained from the EOQ model for the multi-product inventory model. Through the in-depth analysis of comparing the two models, we observe that the model of using the joint order period produces less total cost when the degree of purchase dependence is high, but the model of using the individual order period produces less total cost when the degree of purchase dependence is low.

본 연구는 도심지 경관용으로 식재되는 초화류의 일조부족에 따른 관상성의 차이를 평가하기 위하여 수행하였다. 생장 특성에 따라 수직형, 부채꼴형, 반구형 식물 6종을 대상으로 7개월간의 차광처리 후 생장 특성을 조사하였다. 이 후 각 생장 유형에 따라 형태, 밀도, 색상 등의 관상 특성을 표현할 수 있는 산출식을 도출하였다. 차광처리 전, 후 식물 생육을 측정 한 후 산출식에 따라 관상가치를 평가한 결과 가우라는 자생 지 환경에서의 관상가치를 5점으로 하였을 때 50% 차광에서 0.66점 낮았고, 돌단풍은 80%에서 0.99점 부족한 관상성을 나타냈다. 다양한 환경조건에서 식물들의 생장 패턴을 유형화하는 등의 지속적인 경관식물의 가치 정량화에 대한 후속연구를 통해 도심지 녹지의 질을 높이는데 다양한 식물이 활용될 수 있게 함으로써 관상식물의 부가가치 향상을 기대할 수 있을 것이라 사료된다.

There has not been any scientific analysis on appropriate size of workforce and salary for civilian workers in military so far. Thus, this paper conducted analysis on propriety in employment size of military doctrine researchers using system dynamic methodology based on annual military doctrine workload. Vensim software was mainly used to measure complement of the research group based on data from job analysis. Secondly, a multiple regression analysis was performed to study an appropriate wage for researchers based on their expertise and working condition. The data from twenty public research institutions and twenty eight job positions that are performing similar duty with military doctrine researchers was obtained and utilized to create a salary- estimation regression equation in the analysis. Finally, with cost-benefit analysis method this paper studied financial effectiveness of hiring military doctrine researchers. Contingent valuation method, which has been recognized as one of the most effective methodologies in cost-benefit analysis on intangible value, was utilized to measure benefit of hiring the researchers. The methodology presented in this paper can be applied to measure and improve the efficiency of military organization not only in military doctrine research area but also in several military functional area (military training, logistics, administration, combat development, and combat support).

This study is based on a representative body shape drawn from previous studies that classify adult male torso shapes. In this study, a design method is proposed by developing a tight-fit pattern that can be easily developed into various items and designs using the body surface development figure. This is obtained by converting the 3D body shape of the model representing the representative body shape. The specific design method was conducted as follows. Actual measurement values were used for waist back length, waist-to-hip length, shoulder length. The scye depth was determined as C/4–1.7 cm, and the front and back Interscye was set at (1/2 × actual measurements)–0.2 cm. The front-back neck breadth was set to (1/5 × base neck circumference)–1.3 cm and (1/5 × base neck circumference) cm. The front-back neck depth was set to (1/5 × base neck circumference)–1.2 cm and 3.5 cm. Front chest circumference was C/4–1 (front-back difference)cm; (1/4 × back chest circumference) was C/4 + 1 (front-back difference) + 0.3 (dart amount) cm. Front waist circumference was W/4–0.2 (front-back difference) + 2.2 (dart amount) cm; back waist circumference was W/4 + 0.2 (front-back difference) + 2.5 (dartamount) cm; front hip circumference was H/4 + 0.2 (ease) + 0.2 (front-back difference) cm; and back hip circumference was H/4 + 0.2 (ease)–0.2 (front-back difference) cm; Front droop was 1.6 cm. The newly developed tight-fit pattern is expected to be of great use as a basis for garment construction.

본 연구의 목적은 좋은 보육교사에 대한 주관적인 태도의 유형과 특성을 분석하기 위해 Q 방법론을 활용하는 것이었다. 선행논문과 심층면담을 통해 총 170개의 Q모집단을 구성하였으며, Q모집단 중에서 연구의 주제와 가장 관련성이 있고 대표성이 있다고 판단되는 33개의 진술문을 Q표본으로 최종 선정하였다. 연구를 위한 P표본은 P시에 근무중인 어린이집 교사 23 명을 선정하여 좋은 보육교사에 대해 인식하고 있는 것을 9단계로 Q분류하도록 하고 그 자료를 QUANL Program을 이용하여 분석하였다. 그 결과, 세 가지의 유형으로 분류되었고, 제 1 유형은 ‘인정형’, 제 2유형은 ‘소통형’, 제 3유형은 ‘민감형’으로 명명하여 제시하였다. 제 1유형은 아이들의 개인차를 인정하고 칭찬과 격려로 아이 존재 자체를 그대로 인정하며 안전하게 돌보아야 한다는 것으로 나타났고, 제 2유형은 밝고 유쾌함으로 아이들을 좋아하고 사랑하며 원장, 동료 교사와 협력적인 관계를 맺어야한다는 것으로 나타났으며, 제 3유형은 아이들을 사랑하고 아이들의 요구에 민감하게 반응하며 안전하게 돌보아야 한다는 것으로 나타났다. 본 연구의 결과는 교사들에게 좋은 보육교사에 대해 인식할 수 있는 기회를 제공하며 보육의 질을 향상시키는데 밑거름이 되는 기초자료를 제공할 것으로 기대한다.

The purpose of this study was to provide the basic data of butternut squash (Cucurbita moschata) according to the drying methods. The proximate composition and chromaticity of freeze-dried and hot air-dried Cucurbita moschata powders were evaluated, and the antioxidant effects of these ethanolic extracts were analyzed by DPPH, ABTS, FRAP, reducing power activity, total phenolic, and flavonoid content. As a result, Cucurbita moschata was revealed to have high carbohydrate and crude protein contents, while crude ash and crude fat contents were relatively low. Also, it was confirmed that the hot air-dried Cucurbita moschata had lower L, a, and b values than the freeze-dried Cucurbita moschata. Additionally, as a result of analyzing the antioxidant activity of Cucurbita moschata ethanolic extracts, hot air-dried Cucurbita moschata ethanolic extract showed significantly superior antioxidant activity than freeze-dried Cucurbita moschata ethanolic extract. Also, hot air-dried Cucurbita moschata ethanolic extract was revealed to have a higher polyphenol content, but slightly lower flavonoid content than freeze-dried Cucurbita moschata ethanolic extract. Based on the data from this study, further experiments on Cucurbita moschata material are necessary.

The purpose of this study was to investigate the antioxidant activity and β-glucan content of extracts extracted by varying the temperature at 30, 55 and 80℃ after hot air drying or freeze drying of Pleurotus ostreatus and Pleurotus eryngii. For the analysis antioxidant activity of each mushroom, β-glucan, total phenol, flavonoid contents, and DPPH․ABTS+․Nitrite assay were measured. Also, the β-glucan content, total flavonoid content and ABTS+ scavenging activity increased with freeze drying rather than hot air drying, and increased with increasing extraction temperature in both mushrooms. However, the total phenol and nitrite scavenging activity increased with hot air drying rather than freeze drying, and decreased with increasing temperature in both mushrooms. DPPH scavenging activity was not significant in both mushrooms, but decreased with increasing extraction temperature. Pearson’s correlations between total flavonoid content and antioxidant activities were r=0.719~0.753 (p<0.01). As a result, the β-glucan content, total flavonoid content, and ABTS radical cation scavenging activity were highest during freeze drying and extraction at 80℃. And the highest total phenol content, DPPH radical scavenging activity and nitrite scavenging activity were obtained during hot air drying and extraction at 30℃.

본 연구에서는 고추의 수확 및 유통 단계에서 미생물 오염 수준과 그 발생원인을 확인하였고, 이를 바탕으로 수확 단계에 사용된 작업자 장갑의 교체와 온도 관리 및 소형 플라즈마 발생장치를 사용하여 신선 고추에 대한 미생물 오염에 저감화 방안을 모색하고자 하였다. 작업자 장갑 미교체 시 3시간 기준으로 작업 전과 후의 일반세균 미생물 오염증가율이 약 190% 증가하는 것으로 확인되었고, 이에 반해 교체한 작업자의 장갑의 미생물 오염증가율은 15% 증가하는 것으로 나타났다. 유통과정 중 보관 온도는 냉장 보관 보다 상온 보관일 때 미생물 오염 수준이 더 높은 것으로 나타나 냉장 보관이 미생물 오염 예방 에 더 효과적인 것으로 나타났다. 추가로 소형 플라즈마를 이용하였을 때 초기 균 수 대비 5일차에서 일반세균 3.0 log CFU/g 감소, 대장균군, 효모/곰팡이는 불검출로 나타났고 플라즈마 발생장치 없는 경우 5일차에 대장균군이 2.1 log CFU/g 수준으로 검출되어 소형 플라즈마 발생장 치가 보관 및 유통과정 중의 미생물의 저감에 효과적일 것으로 판단되었다. 이상의 결과로 볼 때 수확단계에서 미생물학적 위해요소 발생원인 중 하나인 작업자의 장갑을 주기적으로 교체하고 현장에서 쉽게 수행 가능한 냉장 유통 방법과 신선 고추의 수확 후 보관 및 유통 중에 소형 플라즈마 장치를 이용한다면 고추의 미생물 오염을 감소 시키는데 효과적인 것을 확인할 수 있었다. 또한 고추 이외에도 다른 신선농산물의 수확, 선별 단계나 유통단계에 미생물의 오염을 예방 또는 저감화 하는데 이용이 가능할 것으로 생각된다.

Effects of heating methods (hot-air heating, roasting, and microwave radiation) and kernel characteristics on the expansion of whole grains from different botanical sources have been examined. Waxy brown rice which composed of hard endosperm with tightly adhering pericarps showed explosive expansion during heating. Scanning electron microscopy showed that starch granules in hard endosperm expanded during heating, forming porous internal structure. Meanwhile those in soft endosperm remained intact since moisture vaporized into the void surrounding the granules. Whole wheat which expanded to the least extent during heating showed the formation of large fissures between pericarp and seed coat, indicating improper rigidity of pericarps as well as endosperm texture for puffing. The degree of expansion and microstructure of kernel varied depending on the heating methods applied due to their different heat transfer characteristics. Hot-air heating resulted in the higher extent of expansion than roasting or microwave radiation. Whole grains heated by either roasting or microwave radiation showed not only similar extent of expansion but also internal microstructures, although roasting process created the formation of an agglomerated mass at the domain of endosperm due to the partial gelatinization of starches.

본 연구는 전문코치의 코칭역량 인식유형과 특성을 파악하기 위하여 Q방법론을 활용하여 분석하였다. 코칭역량에 대한 Q모집단을 구성한 후, Q표본인 33문항의 Q진술문을 추출하였고 전문코치 22명을 P샘플로 선정하여 33개의 진술문을 Q분류를 통해 자료수집 후, QUANL 프 로그램을 활용하여 주요인분석을 실시하였다. 연구결과 코칭역량에 대한 인식은 3개의 유형으로 분류되었다. 제1유형은 ‘목표달성역량 추구형’으로 코칭을 통해 고객의 목표달성을 코칭 핵심역량으로 생각하는 유형이다. 제2유형은 ‘관계형성역량 추구형‘으로 코칭은 고객과의 신뢰, 성실, 진정성으로 맺어져야 하며 관계형성이 코칭의 성과를 낼 수 있는 역량이라고 생각하는 유형이다. 제3 유형은 ‘원칙유지역량 추구형’으로 코치로서 코칭의 개념, 철학, 태도 등 기본에 충실하여야 한다고 생각하는 유형이다. 본 연구를 통해 전문코치가 생각하는 코칭역량에 대한 인식을 확인하였으며 이러한 결과를 토대로 코칭역량 함양을 위한 구체적인 계획 및 실천을 위한 기초자료를 제시하여 본 연구를 통해 코치의 코칭역량 교육과 관련 양성교육기관에서의 코칭역량 인식 유형별 코칭 교육프로 그램의 개발 등의 지속적인 후속연구가 이루어지길 기대한다.

본 논문에서는 풍하중에 노출된 강재 및 CFRP로 구성된 비닐하우스에 대한 확률론적 성능비교를 하였다. 풍하중에 대한 취약성은 강풍에 노출된 온실의 파괴확률을 추정하기 위해 사용되었으며 단동 비닐하우스의 유한요소 모델링은 한국농촌 경제연구원에서 발간한 설계도를 적용하였다. 해석결과를 구조물의 한계상태와 비교함으로써 비닐하우스의 파괴상태를 결정할 수 있다. 기본적으로 몬테카를로 시뮬레이션은 풍속에 따른 파괴확률을 도출하기 위해 가상의 풍하중에 대하여 적용하지만 본 논문에서는 전체에 대한 수직 및 수평 변형한계상태를 고려하였다. 그 결과, 강재 비닐하우스가 가장 높은 성능을 보였으며 수평 변형 한계상태가 하중조건에 대한 단동비닐하우스의 파괴원인임을 확인하였다.