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Article
Publication date: 18 October 2011

Ngoc Anh Vu, Young‐Jae Lee, Jae‐Woo Lee, Sangho Kim and In Jae Chung

The purpose of this paper is to study the conceptual design and optimisation of a compound gyroplane. A study of a compound gyroplane configuration and its characteristics was…

870

Abstract

Purpose

The purpose of this paper is to study the conceptual design and optimisation of a compound gyroplane. A study of a compound gyroplane configuration and its characteristics was performed to develop a sizing program.

Design/methodology/approach

The vertical takeoff and landing capabilities of a helicopter are particularly important. The need for efficient hover and the effectiveness of forward flight in the helicopter can cause conflicts within the design process. The designers usually wish to increase the helicopter's maximum forward speed. Recently, the compound aircraft is one of the concepts considered for the purpose of expanding the flight envelope of rotorcraft. The study of the compound gyroplane showed its advance capabilities for this purpose. Understanding its characteristics, a number of calculations are conducted to implement a sizing program for compound gyroplanes based on the conventional helicopter sizing process.

Findings

The results of the sizing program were validated using existing aircraft data such as the Challis Heliplane, Carter Copter, FB‐1 Gyrodyne, and Jet Gyrodyne. The program is appropriate to size a compound gyroplane at the conceptual design phase. An optimisation study was also performed to enhance sizing results. The compromise between the rotor lift sharing factor and the ratio of the wing span (Bw) to rotor diameter (D) was solved by choosing the total gross weight (TOGW) as the objective function, while the design variables are compromising factors. The optimum results showed that the TOGW of all four kinds of compound gyroplanes was considerably reduced.

Originality/value

A conceptual sizing program for unconventional compound aircraft was developed. The study showed that an optimum design process is necessary to enhance the sizing results.

Details

Aircraft Engineering and Aerospace Technology, vol. 83 no. 6
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 March 2015

Jieheerah Yun

Very recently, the South Korean architectural field has seen a rising trend to reinterpret the traditional hanok, meaning Korean-style house. While this presents an interesting…

52

Abstract

Very recently, the South Korean architectural field has seen a rising trend to reinterpret the traditional hanok, meaning Korean-style house. While this presents an interesting diversion from the housing market dominated by high-rise apartments, there is a lack of consensus in determining the scope and definition of hanoks. This is because of many experiments with the features of the hanok, such as inclusion of new material, construction techniques, and even radically new spatial organizations.

This article explores and analyzes the effectiveness of four different approaches of reinterpreting hanoks: apartment hanoks, urban hanoks, rural experimentations, and contemporary versions. At one end of the spectrum, there is the recent integration of a hanok’s features in high-rise apartments otherwise considered modern. Then I move on to discuss examples of urban hanoks built since the start of the industrialization era in the 1920s and afterwards. Urban hanoks are detached houses, most of which show a stylistic preference toward wooden hanoks of the elite literati. The third approach is rural experimentations that involve the development of an unconventional construction method by both architects and non-architects. Finally, this paper turns to reinterpretations of the hanok by architects trained in contemporary architecture. Although each approach differs in the degree of integrating historical hanok features, some commonalities, such as low floor area ratio and the organic integration of an open courtyard, can be detected among the successful cases.

Details

Open House International, vol. 40 no. 1
Type: Research Article
ISSN: 0168-2601

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Expert briefing
Publication date: 10 February 2021

Her successor is Chung Eui-yong, President Moon Jae-in’s former national security advisor. At his swearing-in yesterday, Chung called peace with Pyongyang “a must-go path”. At his…

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DOI: 10.1108/OXAN-DB259440

ISSN: 2633-304X

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Geographic
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Article
Publication date: 11 December 2018

John R. Turner, Rose Baker, Jae Schroeder, Karen R. Johnson and Chih-Hung Chung

The purpose of this paper was to examine the definitions of global leadership and indigenous leadership, identify leadership capacities inherent in human resource development…

3338

Abstract

Purpose

The purpose of this paper was to examine the definitions of global leadership and indigenous leadership, identify leadership capacities inherent in human resource development (HRD) and determine relationships of the three as a means to develop a model to aid and guide opportunities for future research.

Design/methodology/approach

Following a two-stage integrative literature review of HRD, global and indigenous leadership literature, the grounded theory constant comparative method established 31 positive and 1 negative leadership domains, and respective capacities, and compare domains from literature.

Findings

The Global Leadership Capacity Wheel informs researchers of strengths and areas for additional research, has resulted in a more complete model of global leadership and calls for increased clarity for leadership capacity model development, especially for complex, global environments and local constructs and theories.

Research limitations/implications

Although the literature had adequate representation in the business and organizational acumen and managing people and relationships central global leadership domains, more research and reporting is required for managing self and indigenous leadership capacity development subdomains.

Practical implications

Leadership development is a high priority and core function of HRD. The Global Leadership Capacity Wheel provides a tool for scholars and practitioners to guide global leadership development programs and research.

Social implications

Understanding the relationships of leadership capacities from global and indigenous perspectives is helpful to examine cultural, identity and macro-contextual dimensions and their influence on leadership.

Originality/value

The Global Leadership Capacity Wheel provides a type of road-map, a holistic representation, in the context of developing global leaders in today’s complex environment.

Details

European Journal of Training and Development, vol. 43 no. 1/2
Type: Research Article
ISSN: 2046-9012

Keywords

Available. Open Access. Open Access
Article
Publication date: 30 November 2005

Jae Ha Lee and Je Ryun Chung

This study examines the lead-lag relationship between KOSPI200 and the volatility index based on the implied volatility from the KOSPI200 options. The sample period covers from…

56

Abstract

This study examines the lead-lag relationship between KOSPI200 and the volatility index based on the implied volatility from the KOSPI200 options. The sample period covers from January 2, 2003 to June 30, 2004. Both daily and minute-by-minute data were used for the lead-lag analysis. The study also determines whether the response of volatil ity index to KOSPI200 is symmetric or not. The most important findings may be summarized as follows.

First, there is no lead-lag relationship between the change in volatility index and the KOSPI200 returns on a daily basis. However, on a minute-by-minute basis, volatility index leads KOSPI200 for the group of largest increases in volatility index, and the opposite is true for the group of largest decreases and least changes in volatility index. The option market appears to react more quickly to volatility increases, while the stock market seems more sensitive to volatility decreases. Second, the volatility increase in response to the stock market decline is more severe than the volatility decrease in response to the stock market rise for daily data. This evidence of asymmetry suggests that volatility index plays a role of investors’fear gauge. Our results show no asymmetric response of volatility index to stock market movements for weekly data.

Details

Journal of Derivatives and Quantitative Studies, vol. 13 no. 2
Type: Research Article
ISSN: 2713-6647

Keywords

Available. Open Access. Open Access
Article
Publication date: 31 August 2015

Jae Hwa Lee

Culture and network may be interacted according to their impact on international trade, in such a way that networks alleviate the negative effect of cultural dissimilarity. This…

1352

Abstract

Culture and network may be interacted according to their impact on international trade, in such a way that networks alleviate the negative effect of cultural dissimilarity. This study investigates the effect of network and culture on international trade, and a possible interaction between two effects. Empirical findings from the augmented gravity model using a bilateral data set of 34 OECD countries confirm the positive effect of cultural proximity and network on trade. More importantly, the findings also reveal an interaction effect in a way that networks, such as FDI, migration and internet, play a significant role in mitigating the deterrent effect of culture dissimilarity on international trade. The internet is found to have the strongest interaction effect, followed by FDI and migration.

Details

Journal of International Logistics and Trade, vol. 13 no. 2
Type: Research Article
ISSN: 1738-2122

Keywords

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Article
Publication date: 22 March 2019

Tae Wan Kim

The purpose of this paper is to examine regional voting patterns in South Korea using the results from six presidential elections since the 1990s.

152

Abstract

Purpose

The purpose of this paper is to examine regional voting patterns in South Korea using the results from six presidential elections since the 1990s.

Design/methodology/approach

A χ2 test was used to determine the municipalities where a regional voting pattern emerged, and λ correlation coefficients were calculated to examine changes in the regional voting patterns.

Findings

The analyses lead to three key findings. First, voting patterns differ in Yeongnam and Honam: regional voting in Yeongnam is getting weaker, it remains strong in Honam. Second, the tendency to vote along regional lines decreased significantly in the election in which the Honam party fielded a candidate with a Yeongnam appeared identity. Third, regional voting patterns declined but then stabilized at a constant level, regardless of the candidates’ local identity, which was confirmed in “Bu-Ul-Gyeong.”

Originality/value

This paper can empirically verify the manifestation of regional voting pattern and confirm the trend. It is possible to derive a condition for suppressing the regional voting pattern.

Details

Asian Education and Development Studies, vol. 8 no. 3
Type: Research Article
ISSN: 2046-3162

Keywords

Available. Open Access. Open Access
Article
Publication date: 31 May 2005

Jay M. Chung and Jae Keun Kim

We examine the argument of the Financial Supervisory Service that the behavior of the Individual Investors to buy an out-of-the-money option is excessively speculative. The FSS…

15

Abstract

We examine the argument of the Financial Supervisory Service that the behavior of the Individual Investors to buy an out-of-the-money option is excessively speculative. The FSS reported that the individual investors incurred huge losses in the trading of KOSPI200 index options for the years 2002 and 2003. But since the sample period is relatively short, the argument does not seem fully convincing. Using a longer period data from July 1997 to December 2003, we reconfirm the huge losses of the Individual investors and also find that a tendency of individual investors losing money in association with option trading perSisted during the longer period. The individual investors chose out-of-the money options with short time to maturity, that are cheap and thus are expected to make huge profits with very low probabilities. Finally, we tind that out-ot-the money options with short time to maturity turn out to be in general priced higher than what the Korea Stock Exchange model suggests.

The practice of purchasing out-of-the-money options for the reason of cheap prices and huge profit possibilities can be regarded as being excessively speculative. Due to overpricing, the individual investors persistently incurred some losses.

Details

Journal of Derivatives and Quantitative Studies, vol. 13 no. 1
Type: Research Article
ISSN: 2713-6647

Keywords

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Article
Publication date: 4 November 2013

Jiyoung Hwang, Jae-Eun Chung and Byungho Jin

This study aims to examine unique cultural influences in the context of buyer-supplier relationships in a Confucian culture. The paper identifies whether and how long-term…

2561

Abstract

Purpose

This study aims to examine unique cultural influences in the context of buyer-supplier relationships in a Confucian culture. The paper identifies whether and how long-term orientation (LO), an inherent value of Confucianism, is an antecedent of important factors of channel relationships, rather than a relationship outcome and whether and how market orientation mediates relations among LO and other relational factors.

Design/methodology/approach

Data were collected from retail buyers at department stores in South Korea, a country that is representative of Confucian culture. One hundred and fourteen valid cases were analysed using path analysis to assess the proposed model.

Findings

LO plays significant anteceding roles in market orientation, trust, and economic dependence, both directly and indirectly. In addition, market orientation mediates the impact of LO on trust and economic dependence.

Research limitations/implications

Testing the proposed model with both retailers' and suppliers' data will add robustness to the research findings. This research advances the understanding of cultural influence on channel relationship regarding the role of LO and market orientation. Strategic practical implications include that marketers who deal with business partners in Confucian culture need to understand the embeddedness of LO and its impact on business relationship management.

Originality/value

The current study scrutinizes unique aspects of cultural influence on the anteceding roles of LO and the direct relationship between LO and market orientation in Confucian culture. The findings on the cultural embeddedness of LO provide novel insights; they also provide managerial implications for Western marketers in how to better deal with Confucian business partners.

Details

Asia Pacific Journal of Marketing and Logistics, vol. 25 no. 5
Type: Research Article
ISSN: 1355-5855

Keywords

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Article
Publication date: 13 January 2022

So Won Jeong and Jae-Eun Chung

Building on the resource-based view (RBV), this study examines the differential roles of internal and external social capital (SC) in enhancing the marketing innovation (MI)…

1884

Abstract

Purpose

Building on the resource-based view (RBV), this study examines the differential roles of internal and external social capital (SC) in enhancing the marketing innovation (MI), competitive advantage and financial performance of Korean small and medium-sized enterprises (SME) in export markets.

Design/methodology/approach

In total, 197 valid cases were obtained from Korean manufacturing SMEs in the consumer goods sector. Then, a path analysis was employed to test the proposed hypotheses.

Findings

First, SME internal SC positively influenced MI, whereas external SC positively influenced foreign distributor's MI (or foreign distributor MI). Second, SME MI was positively associated with foreign distributor MI. Third, no statistical differences were found in the strength of the paths from foreign distributor and SME MI to competitive advantage. Meanwhile, foreign distributor MI positively affected financial performance more than SME MI. Fourth, SME competitive advantage predicted a positive financial performance. Finally, the effect of SME MI on financial performance had an inverted “U” shape.

Originality/value

This study fills a research gap in the MI literature by identifying MI in terms of its actors (SMEs and their foreign distributors) and examining the differential roles of internal and external SC in MI.

Details

Asia Pacific Journal of Marketing and Logistics, vol. 35 no. 1
Type: Research Article
ISSN: 1355-5855

Keywords

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