• Korean Journal of Food Science and Technology
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• v.22 no.4
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• pp.405-410
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• 1990

The aroma components of duchung tea and persimmon leaf tea were collected simultaneous distillation and extraction method. Those were analyzed and identified by GC-MS using a fused sillica capillary column. Seventy seven components, including 17 alcohols, 3 hydrocarbons, 15 ketones, 16 aldehydes, 8 esters,8 acids, 8 heterocyclic compounds and 2 phenols were confirmed in duchung tea. Seventy one components, including 17 alcohols, 10 hydrocabrons, 11 ketones, 13 aldehydes, 8 esters, 6 acids, 5 heterocyclic compounds and 1 phenol were confirmed in persimmon leaf tea. The most abundant components of duchung tea were aldehydes(23.31%) including 2-pentenal and heterocyclic compounds(16.71%) including $epoxy-{\beta}-ionone$. The most abundant components of persimmon leaf tea were alcohols(25.57%) including linalool and aldehydes(19.45%) including hexanal and hydrocarbons(10.40%) including ${\alpha}-copaene$.

• The Journal of the Korea Contents Association
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• v.19 no.1
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• pp.205-222
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• 2019

In this study, we explored the relationship between experienced discrimination and volunteering activities among the $2^{nd}$ baby boom generation. Specifically, applying structural equation modeling, we examined how the effect of experienced discrimination on volunteering among the $2^{nd}$ baby boom generation is mediated by the negative perception of equal opportunity and achievement by personal merit. Data were obtained from the 2016 National Survey on Unequal Opportunity from the Circle Foundation. The research sample was comprised of 474 baby boomers ages 42 to 48 at the time of survey. Results indicated that perceived discrimination affects the level of volunteering among the $2^{nd}$ baby boom generation, through the negative perception of equal opportunity and achievement by personal merit. Based on the findings, we presented policy implications that could promote volunteering activities among the $2^{nd}$ baby boom generation.

• Journal of Public Diplomacy
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• v.3 no.2
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• pp.53-68
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• 2023

Some observers call current conflicts in international relations as a new Cold War. But the characteristics of the new Cold War are more complicated than that of the Cold War. Under this condition, Korean government established the 2^nd Basic Plan for Public Diplomacy in 2022. Compared with the 1^st Basic Plan, the 2^nd plan shows several progress such as expansion of items for knowledge (public) diplomacy and inclusion of global value as a part of public diplomacy for policy. The 2^nd plan also emphasizes digital public diplomacy as a tool for enhancing the Korean government's public diplomacy. Despite substantial progress, the plan does not suggest definite and reliable global values as a part of Korean public diplomacy for policy. This study provides several important points to develop Korea's public diplomacy in a new Cold War.

• Korean Journal of Agricultural and Forest Meteorology
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• v.20 no.2
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• pp.175-182
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• 2018

Knowledge of the optimum cultivation period for Chinese cabbage would help growers especially in spring in Korea. Growth and yield of Chinese cabbage in a temperature gradient chamber was evaluated for the growing periods of 64 days from three set of transplanting dates including March 6, March 20, and April 3 in 2017. Air temperature in the chamber was elevated step-by-step, by $2^{\circ}C$ above the ambient temperature. This increment was divided into three phases; i.e. low (ambient+$2^{\circ}C$, A), medium (ambient+$4^{\circ}C$, B), and high temperature (ambient+$6^{\circ}C$, C). The fresh weight of Chinese cabbage was greater under B and C conditions in the first period and A in the second period, which indicated that GDDs affected the fresh weight considerably. However, leaf growth (number, area, length, and width) did not differ by GDDs. Bolting appeared under A condition in the first period, which was caused by low temperature in the early growth stage. Soft rot was developed under C condition in the second period and all temperature conditions in the third period, which resulted from high temperature in the late stage. Fresh weight increased when GDDs ranged from 587 to 729. However, it decreased when GDDs > 729. The maximum expected yield (16.3 MT/10a) was attained for the growing period of 64 days from transplanting date during which GDDs reached 601. The GDDs for optimum cultivation ranged from 478-724 under which the yield was about 95% (15.5 MT/10a) of maximum fresh weight. Such an optimum condition for GDDs was validated at five main cultivation regions including Jindo, Haenam, Naju, Seosan, and Pyeongtaek in Korea. In these regions, GDDs ranged from 619-719. This suggested that the optimum GDDs for Chinese cabbage cultivation would range from 478-724, which would give the useful information to expect the cultivation periods for ensuring maximum yield.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.298-300
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• 2004

바이오 인포메틱스에서의 데이터 검색은 DNA와 단백질 시퀀스에 대해서 주로 이루어지며, 지금까지의 연구는 주로 DNA와 단백질 1차 구조의 검색에 대해 이루어졌다. 단백질 2차구조는 1차구조 내 인접한 아미노산들의 공간적인 배열을 나타내며. 단백질의 기능을 예측하는데 중요한 3차구조의 지역적 아미노산의 특성을 나타낸다. 따라서 2차구조에 대한 검색은 단백질의 기능을 이해하는데 매우 중요한 역할을 한다［1］. 이 논문에서는 단백질 2차구조 및 질의 문자열을 세그먼트 단위로 나누고 검색하는 r41의 방법을 개선하여 세그먼트를 조합한 클러스터 구조 및 Look Ahead를 사용해 Exact Matching 및 Wildcard Matching 질의를 효율적으로 처리할 수 있는 기법을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.319-321
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• 2004

단백질은 생명험상 유지에 필수기능을 담당하며 이러한 기능이 단백질의 3차 구조에 의해 결정되므로 단백질 3차 구조에 대한 연구가 활발히 진행되고 있다. 본 논문에서는 단백질의 3차구조를 파악할 수 있는 Java3D 기반의 단백질 구조 뷰어인 PSAML Viewer에 관해서 기술한다. PSAML은 단백질의 2차구조와 2차구조 사이에서 발견되는 상호적인 관계를 이용하여 단백질 구조를 표현하는 방법이다. PSAML에 정의되어 있는 단백질 2차구조 $\alpha$-나선과 $\beta$-판상조각의 정보(서열, 길이, 공간상의 좌표)를 분석하여, 단백질 구조를 시각화한다. 이는 단백질 구조 정보를 보다 쉽게 이해하는데 도움을 줄 수 있다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.11a
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• pp.353-356
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• 2008

The effects of design parameters of supersonic ejector system under the assumption of constant pressure mixing; such as mass flow rate ratio, area ratio, Primary mach number on ejector system performance were investigated by theoretical formulations. And for a given design condition and working fluid, Computational Fluid Dynamics was conducted.

• Journal of the Korean Wood Science and Technology
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• v.37 no.6
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• pp.517-523
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• 2009

Repeated impregnation and carbonization processes were performed to prepare high-density woodceramics using a sawdust board. The physical properties were investigated to confirm morphological and structural changes of one-time and two-time phenolic resin-treated and carbonized woodceramics. As comparing between one-time and two-time carbonized woodceramics, the weight and the density of the two-time carbonized woodceramics decreased with an increase of the carbonization temperature. When the carbonization temperature was $600^{\circ}C$, the weight increased by 21.7% and density increased by 20.6% from $0.68g/cm^3$ to $0.82g/cm^3$, respectively, as a maximum value.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.12A
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• pp.1019-1024
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• 2003

In the thesis, we propose a new type of the predistortion linearizer using frequency multiplier The linearizer utilizing the 2nd and 3th harmonic used the individual control of the 3rd and 5th order intermodulation distortion(IMD) component. This structure is composed of wilkinson power combiner for combine and isolation of output signal, 3rd order IMD product controller using doubler and 5th order IMD product controller using tripler. The proposed predistortion linearizer controlled by individual order is obtained for about -16 dBc and 18 dBc of 3rd order and 5th order IMD components, respectively, over the frequency band 870 MHz to 880 MHz at the output power of 34 dBm/tone.

• Korean Journal of Food Science and Technology
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• v.50 no.5
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• pp.464-473
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• 2018

The objective of the current study was to evaluate the effects of roasting methods on volatile flavor compounds of boricha using solvent-assisted flavor evaporation-gas chromatography (GC)-mass spectrometry and GC-olfactometry. The barley roasting methods tested were air roasting (AR), drum roasting (DR), and air/drum roasting (ADR). Twenty, twenty-one, and eighteen aroma-active compounds were detected in the products of AR, DR, and ADR, respectively. Guaiacol (smoky), 2-acetylpyrazine (almond-like), and furfuryl alcohol (burnt sugar-like) were detected as high intensity aroma-active compounds. Intensities of most aroma-active compounds produced by the DR method were higher. On the other hand, aroma intensities of phenols produced by the AR method, such as guaiacol and 2-methoxy-4-vinylphenol (curry-like), tended to be stronger. Aroma characteristics of phenols are not considered to be desirable for boricha. Although roasting time for DR was longer than that for AR, DR may be an effective barley roasting method for enhancing desirable aroma characteristics of boricha.