KS H ISO 1242 표준의 평가 : 라반딘 정유의 산값 측정

전혜림,이은지,장혜진,손현화,김건,김남선,전명숙,이동선 서울여자대학교 2010 자연과학연구논문집 Vol.22 No.-

The acid value (AV) as well as the ester value of essential oil is an important index to evaluate quality of essential oil. The official standard analytical method of KS H ISO 1242 dealing with “Essential oils - Determination of acid value” was assessed experimentally using two lavandin essential oils obtained in France as an example. One French lavandin oil sample showed the results of AV= 0.9 by both indicator method and potentiometry. Another sample showed AV = 1.9 by indicator method and AV = 1.6 by potentiometry. Latter lavandin oil sample exhibited significantly higher acid value than maximum value of 1 described in the standard. This result suggests that latter lavandin oil was contaminated, because this oil was contained in an orange juice bottle. Results of this study proved that KS H ISO 1242 could be used as a suitable scientific standard for the determination of acid value of essential oils.

고등학교 토론 단원 교수ㆍ학습의 비판적 분석

김지현,전은주 부산대학교 사범대학 과학교육연구소 2012 교사교육연구 Vol.51 No.2

이 연구에서는 고등학교 국어 교과서의 토론 단원 통합 방식, 토론 지식의 설명 방식, 학습 활동의 타당성, 평가의 타당성 등에 대하여 비판적으로 분석하였다. 현재 국어과 교과서의 토론 단원 구성 방식을 ‘통합교육’이라는 측면에서 살펴보면, 토론 단원은 듣기, 말하기 영역의 통합과 여기에 더하여 읽기 영역이 통합된 것이 전부이다. 국어 능력의 총체적인 발달과 효율적 교수-학습을 위해, 쓰기와 문학과의 영역 통합도 가능하며, 말하기 또는 듣기 영역 내에서도 다른 성취 기준과의 통합도 가능하기에 보다 통합적으로 단원을 구성할 필요가 있다. 교과서 토론 단원에서 토론 지식을 설명하는 방법은 크게 ‘설명형’과 ‘요약형’으로 구분 가능한데, 대부분의 검정 교과서들이 ‘요약형’으로 제시함으로써 토론 지식을 단순히 정보 차원의 암기대상으로 다루는 문제점이 있었다. 이 논문에서는 교과서의 토론 단원에서 논제 분석과 토론의 유형과 절차 등 이해가 필요한 부분은 자세하게 ‘설명형’으로 제시하고 토론의 개념, 논제의 종류, 토론 참여자의 역할 등은 간략하게 ‘요약형’으로 제시하는 ‘혼합형’으로 제시하는 방법을 제안하였다. 이 연구에서는 토론 단원에 제시된 학습 활동의 타당성을, 교육과정에 제시되어 있는 여섯 가지 내용 요소를 기준으로 분석하였다. 분석 결과, 여섯 가지 내용 요소가 유기적으로 연결되어야 한다는 점, 활동이 정보 확인 차원에 머무르지 않고 실제적으로 학생들의 토론 능력을 향상할 수 있도록 활동을 구성해야 한다는 점, 학습자의 수준을 고려하여 충분히 상세하게 안내해야 한다는 점 등을 지적하였다. 이 밖에 이 연구에서는 교과서 토론 단원에 제시되어 있는 토론 평가 기준이 타당한가를, 평가 범주, 방식, 내용의 타당성을 중심으로 분석하고 그 문제점과 개선 방안을 제안하였다. This research critically analyzed the integration of the debate unit, explanations about debate knowledge, validity of learning activities and validity of assessment for high school. In terms of the integrated education for debate unit of Korean textbooks, the current debate unit is based merely on the integration of listening, speaking and reading. Integration of writing and literature is possible as well as that of listening and speaking. Besides, integrating other achievement standards under the same language skill is also possible. The way to describe the knowledge in debate consists of explanatory and summarizing types. Most approved textbooks employes summarizing type and regards the debate knowledge as what should be memorized. However, this study suggests that analysis of the discussion topic, types and procedures of the debate should be explained in detail (explanatory type), while the concept of debate, types of issues, and the role of participants should be given briefly in summary (summarizing type). The validity of learning activities in debate unit was analyzed on the basis of the six key elements of the curriculum. The authors pointed out that the six key elements should be organically connected, the activities should be organized practically in order to improve the debate ability of the learners, and detailed information should be provided with consideration of the learners’ level. Finally, the validity of debate assessment criteria provided in the debate unit of the textbooks was analyzed in terms of assessment categories, assessment methods and the validity of the contents.

자동측정망 데이터를 이용한 국내 항공기소음 실태 조사

이주엽,전지현,이태강,김선우 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

Currently domestic criteria for the aircraft noise is being adapted WECPNL(weighted equivalent continuous perceived noise level), while internationally preferred method is L_(dn) which is originated from L_(eq) and can evaluate even environmental noise. WECPNL used in domestic as a evaluation method is only for the aircraft noise. It is, therefore, not adequate for the evaluation of residents' injury, moreover, it is very difficult to measure the aircraft noise with WECPNL due to the complicated calculating procedures as long as automatic measuring system is not used This study aims to propose alternative evaluation method for the aircraft noise. To achieve this purpose, the data measured by automatic measuring system in 5 places among domestic airports from 1998 to 2002 were gathered and calculated with three evaluation method ; WECPNL, L_(eq) and L_(dn) and the results calculated from different methods were compared and analyzed. At the same time, it was investigated problems generated from the actual operating of the automatic measuring system and that remedy was presented.

도심 공원의 음 풍경 디자인을 위한 실험적 연구

이태강,송민정,전지현,장길수 대한건축학회 2005 대한건축학회논문집 Vol.21 No.1

This study is an experimental study to introduce the soundscape design in urban parks Objective 4 urban parks were surveyed And four or three subdivision area in these parks were investigated the sound source frequently to be heard and the degree of satisfaction for visual and auditory atmosphere measuring the sound level in 5 minute subjective response to soundscape for each subdivision area were earned out using 7 scale S D method based on pair of adjectives In order to recognized the effect environment sound (bird Sing, sweet ecological music, and nature sounds)for enriching the present soundscape, this study analyzed the subjective response for soundscape before and after providing environmental sound Result of the evaluation of public perception and their sound were vaned at the each subdivision area, which represented the special characteristics of the urban parks The score for image of the places were always higher than those of the sounds, thus visual Image were affected more positively than auditory image The effect of the environmental sound usually resulted in improvement of the subjective cvaluation at cach subdivision area Factor analyzing of the 25 korean vocabulary for using S D method could be induced the appropriate three factors "impression", "calmness" and "delight" These factors can be used for soundscape design of sound sources and images to provide

Pharmacokinetics of ginsenosides following repeated oral administration of red ginseng extract signifi cantly differ between species of experimental animals

Ji‑Hyeon Jeon,Jaehyeok Lee,Min‑Koo Choi,Im‑Sook Song 대한약학회 2020 Archives of Pharmacal Research Vol.43 No.12

We aimed to investigate ginsenoside pharmacokineticsin mice and rats following the repeated oraladministration of red ginseng extract (RGE) (2 g/kg/day for7 days). In mouse plasma, seven protopanaxadiol (PPD)-type ginsenosides (20(S)-ginsenoside Rb1, Rb2, Rc, Rd,Rg3, 20(S)-compound K, and 20(S)-PPD) and one protopanaxatriol(PPT)-type 20(S)-ginsenoside Re were detected,whereas 20(S)-ginsenoside Rb1, Rb2, Rc, Rd, 20(S)-PPD,and 20(S)-PPT were detected in rat plasma. The tetra- ortri-glycosylated PPD-type ginsenosides Rb1, Rb2, Rc, andRd, high content ginsenosides in RGE, showed high plasmaexposure, a short absorption time (Tmax), and a long eliminationtime (T1/2) among the ginsenosides detected in bothspecies. Among the deglycosylated metabolites existing inthe feces, 20(S)-compound K and 20(S)-PPD in mice and20(S)-PPD and 20(S)-PPT in rats were found in the plasmasamples. In addition to the differences in the ginsenosidesdetected in mice and rats, the Tmax and T1/2 of 20(S)-PPDand 20(S)-PPT in rats were greater than those in mice, suggestingthe species-dependent difference in the gut metabolismand absorption of ginsenosides in the pathway from20(S)-ginsenoside Rd to 20(S)-PPD and from 20(S)-ginsenosideRe to 20(S)-PPT. In conclusion, the choice of animalmodel should be the subject of careful consideration whenexploring the pharmacology of RGE with specific focus onthe plasma profile of an individual ginsenoside.

Improvement of Volatile Quality from Allomyrina dichotoma Larvae Using Yeast Fermentation

Hyeon Ji JEON,Hye Jee KANG,Yeon Ju LEE,Go Eun CHOI,Bo Yeong PARK,Jun Ho HEO,Young Hoon JUNG 한국생물공학회 2022 한국생물공학회 학술대회 Vol.2022 No.4

Measurement of Physiological Activity on Processing Conditions of Chili Pepper

ji su LEE,seongin JO,eun Ji KYOUNG,min ji KIM,chae hyeon KIM,heyeong JEON,hyeon ah CHOI,sanguine BYUN 한국생물공학회 2018 한국생물공학회 학술대회 Vol.2018 No.10

Trends, Functionalities, and Prospects of Probiotics

Jeon Hyeon Ji,Ban O-Hyun,Bang Won Yeong,Yang Jungwoo,정영훈 한국미생물·생명공학회 2022 한국미생물·생명공학회지 Vol.50 No.4

The importance of beneficial microorganisms, particularly probiotics, that coexist in the human body, is being increasingly recognized. Probiotics are representative health functional foods that provide health benefits to humans through the production of various metabolites, including short-chain fatty acids. However, the health benefits are strain-specific, and the use of each probiotic strain should follow guidelines that assure its safety. Accurate identification of the strain should be managed through genetic and phenotypic analyses of the strain. Besides, the functionality of probiotics should be disclosed in vitro and in vivo so that they can be used as legal functional ingredients (i.e., individual standards). In this review, we deal with the guidelines, including the technical factors related to probiotic strains. The common health effects of probiotic strains include proliferation of beneficial bacteria, control of harmful bacteria, and facilitation of bowel activities. Probiotics with various functionalities (e.g., body fat and cholesterol reduction, vaginal health, and improvement of skin’s immune system) have been investigated as “individual standards of raw materials for health functional foods” provided by MFDS. In the future, various biotechnologies including synthetic biology can be applied to produce customized probiotics to improve human health.

Individual-level Cultural Values and Norms at Workplace -Comparison between Korea and China-

( Ji Hyeon Jeon ),( Kyung Ok Park ) 한국인적자원관리학회 2015 인적자원관리연구 Vol.22 No.5

유교 문화의 영향으로 한국과 중국은 다소 상이한 점도 있으나 비교적 유사한 사회적 규범과 문화를 공유하고 있다. 최근 두 나라의 도약적인 경제 발전과 다문화 사회로의 변화로 조직구성원의 가치나 규범체제에도 문화적 변화를 겪고 있음에도 불구하고 두 문화 간 비교연구가 활발히 진행되고 있지 않은 실정이다. 이에 본 연구는 복합적 문화 가치의 변화가 조직구성원의 태도와 행동에 미치는 영향을 조사함으로써 이질성과 갈등을 초래할 수 있는 조직 문화적 이슈를 이해하고 심도 있는 한국과 중국의 비교연구를 위한 기초연구를 제공함에 그 목적이 있다. 조직구성원의 집단주의(collectivism), 권력거리(power distance), 불확실성 회피(uncertainty avoidance)와 같은 Hofstede 문화지수와 전통적 규범(tradtitionality)과 같은사회 규범을 이용하여, 조직구성원간의 관계성(LMX), 그들의 태도(정서적 몰입, 지속적 몰입)와 행동(직무성과와 조직시민행동)에 미치는 문화적 가치와 규범의 영향력에 대해 조사하였다. 검증을 위해 417부(한국 211부, 중국 206부)의 설문을 수집하였다. 분석 결과에 따르면, 불확실성 회피와 전통적 규범은 정서적 조직몰입과 LMX에 정적 영향을 주었는데 이는 중국에 비해 한국 근로자에게 더 큰 의미있는 영향력이 있었다. 반면 권력거리와 지속적 조직몰입은 양국에서 강한 상관관계를 보이며 한국과 중국 근로자 모두에게서 정적 영향관계가 있음을 확인하였다. 불확실성을 회피하고자 하는 양국근로자의 성향은 그들의 직무성과에 정적 영향을 주고 있었으며, 집단주의 성향은 중국 근로자들의 직무성과에는 부적 영향을 주고 있음을 확인하였다. 반면 권력거리에 대한 수용 성향은 한국 근로자의 직무성과에 부적 영향을 주고 있었다. 마지막으로 양국 근로자의 조직시민행동은 불확실성 회피 성향에 의해 정적 영향을 받고 있음을 확인하였다. 연구결과를 바탕으로 시사점과 연구의 한계점 및 향후 연구방향이 논의 되었다. Employing Hofstede’s cultural index, this study examines the level of effects of cultural values (traditionality, collectivism, power distance, and uncertainty avoidance) on employees’ attitudes and work behaviors to compare the influential power of those values of two Confucian countries, Korea and China. Considering that the economic development and diversity in ethnicities led to changes in these two countries’ cultural indices, this study compares the two countries’ values and a norm at workplaces to provide understandings of whether the combination of mixed cultural values from the changes results in culturally different managerial issues. Survey was conducted in both countries, yielding the 417 responses (Korea N=211, China N=206). The results demonstrated that there were some cross-national differences in the effects of cultural values on the LMX, work attitudes and work behaviors. Cultural values (uncertainty avoidance) and a norm (traditionality) on the LMX and affective organizational commitment explained more of Korean workers than of Chinese workers, whereas power distance on continuance organizational commitment made significant effects in both countries. For in-role behaviors (job performance), uncertainty avoidance made significant effects in two countries’ workers. We found that collectivism made a negative effect on Chinese workers’ in-role behaviors while power distance did on Korean workers. The results suggested that Korean and Chinese workers’ extra-role behaviors (OCB) were influenced by uncertainty avoidance.

UV-illuminated chemical bath deposition of CdS buffer layer for CIGSSe solar cells

Hyeon-ji Baek,Ji A. Oh,Young-Eun Seo,Hye-Jin Shin,Sung-Wook Cho,Chan-Wook Jeon 한국물리학회 2020 Current Applied Physics Vol.20 No.1

In this paper, we compare the performance of Cu(In,Ga)(S,Se)2 (CIGSSe) thin film solar cells with a CdS buffer layer grown by chemical bath deposition (CBD) with UV irradiation of 365 nm or 254 nm at an output power of 8 W. The effects of UV light irradiation on the CBD-CdS thin film deposition mechanism were investigated through chemical and electro-optical studies. UV light irradiation during the solution process promotes the hydrolysis of thiourea, thereby inhibiting the formation of the intermediate products being developed on the reaction pathways and decreasing the solution pH. Therefore, the efficiency of the CdS/CIGSSe solar cells was improved because of the increased elemental ratio of S/(S + O) in the CdS thin film. This very simple and effective approach can be used to control the S/O ratio of the CdS thin film fabricated by the CBD process without artificially controlling the process temperature, solution pH or concentration.