본 연구는 초기 성인의 조건부 자아존중감이 열등감에 미치는 영향에서 SNS 상향비교와 SNS 이용동기가 어떠한 역할을 하는지 탐색하고자 하였다. 선행연구를 토대로 각 변인들의 관계에 대한 연구모형을 설정하여, 조절된 매개 효과를 검증하고자 하였다. 이를 위하여 온라인 설문지를 구성한 후, SNS를 이용하는 초기 성인 400명을 대상으로 설문조사를 실시하였으며, 최종적으로 총 351부를 분석에 활용하였다. 본 연구의 주요 결과는 다음과 같다. 첫째, 조건부 자아존중감, SNS 상향비교, SNS 이용동기, 그리고 열등감은 모두 정적 상관을 나타내었다. 둘째, 조건부 자 아존중감이 열등감에 영향을 미쳤으며 SNS 상향비교는 완전 매개하였다. 셋째, SNS 상향비교와 열등감의 관계에서 SNS 이용동기의 조절을 확인하였다. 마지막으로, 조건부자아존중감이 SNS 상향비교를 매개로 열등감에 미치는 간 접효과를 SNS 이용동기의 영향으로 조절하는 것을 확인하였다. 본 연구 결과를 바탕으로 초기 성인이 열등감을 경 험하는 것과 관련하여 심리적이고 정서적인 함의를 제시하였다.

조건부 자아존중감은 외재적 동기에 부합할 때 조건적으로 유지되는 자아존중감이다. 본 연구는 인스타그램 이용자의 조건부 자아존중감이 우울감에 미치는 영향을 알아보고자 수행되었다. 인스타그램 이용자 319명을 대상으로 온라인 설문조사를 수행하였으며, 인스타그램에서의 상향비교의 간접효과를 검증하는 매개 모형을 검증하기 위한 분석을 수행하였다. 연구 결과, 인스타그램 이용자들의 조건부 자아존중감이 높을수록 일주일간 경험하는 우울 경험이 높았으며, 이는 인스타그램 내 상향 비교에 의해 설명되었다. 이는 조건부 자아존중감이 높은 이용자일수록 인스타그램에서 자신보다 우월해 보이는 이용자와 자주 비교하며 이로 인해 더 우울해진다는 점을 시사한다. 본 연구는 SNS 이용자의 우울감에 영향을 미치는 요인의 개인차 변인을 탐색하기 위한 목적에서 수행되었으며 본 연구에서 확인한 결과를 바탕으로 SNS 이용자의 우울감에 대한 기존 연구를 확장한 의의를 논의하였다.

Introduction According to the Federation of the Swiss Watchmaking Industry (FHS) in 2017, Switzerland occupies approximately 3% of the global market regarding the quantity of watches. As for value, Switzerland represents 54% of global sales that is 21 billion USD. About 95% of luxury watches with price starting from 1,000 USD are stamped "Swiss Made.” Thus, the Swiss watch industry has become an integral part of the luxury universe. However, it‟s not an easy task to get a place in this luxury market of reference. According to the estimation made by the Institute of Watch Marketing, there are approximately 200 active Swiss watch brands on the market today. In order to create an uncontested market space and stand out from the competition luxury watch brands are obliged to create a new way of dealing with concurrence. The majority of brands chose the positioning at the top of a watch pyramid. First of all, it is an economic issue: according to the recent Deloitte report (2017) on watchmaking industry, the most important increase is in the category of watches belonging to the “Haute Horlogerie” segment. While other categories have been steadily losing their shares in exports for years, the high-end category of watches is growing considerably. In the last two decades, luxury brand management has attracted much interest and discussions in academic and business circles. Among the business leaders and scientists, the debates were related to the challenges and paradoxes associated with luxury branding and management that emerged as a result of the evolution of the field (Okonkwo, 2007; Kapferer, 2008 Chevalier and Mazzalovo, 2008, Dubois B., Laurent G., et Czellar S, 2001). In order to create and maintain the position of a strong luxury brand, a number of key elements have been identified as crucial and divergent within the scientific literature (Sicard, 2008; Fionda and Moore, 2008, Merle, Chandon and Roux, 2008). Vigneron and Johnson (2004) proposes key luxury dimensions that managers should establish and monitor for creating a lasting luxury brand. Nevertheless, in our opinion there are no many researches explaining hyper luxury segment growth and the upward expansion of the Swiss luxury watchmaking to the hyper luxury. To our knowledge, there is no scientifically accepted definition of the hyper luxury segment. We attempt to define hyper luxury watch brands as “Haute Horlogerie” watch brands with a unique positioning based on the personal-oriented perceptions of customers, high experiential value and proprietary manufacturing know-how, offering mainly mechanical watches in a price range starting at roughly 60„000 USD and then passing to the price categories of 100‟000-500‟000-1‟000‟000 USD for a watch. In order to shed light on upward expansion to Hyper Luxury trend in Swiss luxury watchmaking we should formulate the following research question: What kind of resources to optimize and which processes to implement in order to create resource-based competitive advantage in a highly competitive market of Swiss luxury watchmaking? Methodology To gain a deeper understanding of the upward expansion to hyper luxury in Swiss watchmaking industry we proceed to qualitative research (semi-structured interviews with 20 CEO and Marketing managers) among watchmaking companies. We specifically focused on top managers involved in the product development and decision making and management processes. The key issues addressed were: definition of the key company‟s resources, information management, market sensing, innovative approaches in management, sources of value creation for customers and differentiation strategies, managerial vision and firm-specific practices and procedures. Qualitative research methods were selected for this study with the aim to generate data rich in details and embedded in context. This study will allow us to enlarge and enrich previous theoretical findings and illustrate it with practical evidences. Conceptual framework Last decades have seen an important economic shift from manufacturing to information and knowledge-driven services. This shift has been accompanied by an increase in the importance of intangible assets and capabilities. Thus the source of competitive advantage has changed from mostly manufacturing assets to market based intangible assets and capabilities (Ramaswami et al., 2009). The resource-based theory (RBT) provides an important framework in explanation and prediction of the firm‟s competitive advantage and superior performance based on market based insights (Barney and Arikan, 2001, Vorhies and Morgan, 2005). RBT considers a company as an idiosyncratic mix of resources and capabilities that are available for application by various departments in the company and are very difficult to imitate by competitors (Teece et al., 1997). Accordiang to Barney and Hesterly (2012), sustainable competitive advantage results only if resources are simultaneously valuable, rare, imperfectly imitable, and exploitable by the firm‟s organization (VRIO). This VRIO framework has acknowledged that resources need to be leveraged effectively by the organization, instead of simply possessed by the firm. Even if a resource is valuable, rare, and imperfectly imitable, a firm must be “organized to exploit the full competitive potential of its resources and capabilities. According to Newbert (2008), performance improvement is not directly a function of the value or rareness of a firm‟s resource-capability combinations but rather of the advantages it creates from their exploitation. Then, through insightful theoretical development researchers have expanded the RBT into the concept of dynamic capabilities. Specifically, dynamic capabilities are defined as the ability to build, integrate, and reconfigure internal and external intangible resources to address rapidly changing environments (Winter, 2003). Teece et al (1997) and Eisenhard and Martin states that sustained competitive advantage could be based on the firm‟s renewal and reconfiguration of its resources and capabilities through dynamic capabilities. The dynamic capabilities view changes from the resource-based view of the firm (Barney, 1991), by its attempts to the explanation of the conditions under which firms achieve competitive advantage based on their resources and capabilities (Molina et al., 2014). Furthermore, researchers have increased conceptual understanding of the role of marketing in enabling firms to create and sustain competitive advantage and superior performance (Ramaswami et al, 2009). In accordance with potential to improve business performance, some studies (Bruni and Verona, 2009), have introduced the term „Dynamic Marketing Capabilities‟ (DMCs hereafter). In fact, DMCs are specifically focused on releasing and integrating market knowledge that helps firms evolve. Developing DMCs could constitute the real basis for sustainable competitive advantage and superior performance in most competitive sectors (Molina et al, 2014). Fang and Zou (2009) define DMC as the responsiveness and efficiency of cross-functional business processes for creating and delivering customer value in response to market changes. It is this focus on customer value that distinguishes DMCs from dynamic capabilities in general. According to Bruni and Verona (2009) DMC are those capabilities aimed specifically at developing, releasing and integrating market knowledge that helps firm evolve. Main findings and analysis Analysis of semi-structured interviews with the CEO and marketing managers of the Swiss luxury watchmaking companies lead us to a number of findings concerning the role of DMC for the hyper luxury brand expansion. The exploratory study confirms many of the elements presented in the conceptual part of this article. Most of the Swiss high-end watchmaking companies are traditionally founded focusing on specific kind of watch and technological expertise in it. Often, these companies tend to develop and grow by mastering their technological competences. As it comes from our research nowadays rare are companies that uses dynamic DMC. Even if the majority of companies confirmed the importance of DMC, it is very difficult to implement it on practice due to the complexity of the numerous stages of industrial production, various operations and partners. Meanwhile, there are some companies that managed to integrate the concept of dynamic marketing capabilities and improve their performance. A deeper questioning into their management practices revealed that they are achieving these results because of the sophisticated and effective way of implementation marketing insights coming from partners and clients. These high performing companies generate growth because of their particular focus for constant improvement of their marketing activities. “The main idea is to question all the time our way of working and to elaborate more sophisticated marketing mix than most of our competitors. For us, sophistication of our watches has the same importance as sophistication of our marketing activities”. Our research pointed out that these few firms of Swiss luxury watchmaking industry, that successfully accomplish the search and gap-assessment stages concerning dynamic marketing capabilities have an advantage over rivals. The market-based identification of valuable resources and internal management of intangibles help managers recognize the need for improvement. In a case of such particular industry as Swiss watchmaking where any considerable changes are very costly and time consuming the companies that applies DMC through small steps and project-based development assure their presence and adaptability to the globalized changes of the economy. “Swiss luxury watchmaking industry strongly related to the overall economic and social changes in the world. So we need to be constantly aware and understand global trends, for example, emerging categories of customers and their expectations towards luxury products”. Thus, dynamic marketing capabilities are considered as very important value creation drivers. We identified marketing intelligence, customer relationships and professional networks as the most important elements for additional value creation. “It is clear that information is very important in order to stay “up to date” with the market. As most of decisions and processes depends on the feeling of the current situation on the market and clients, it’s very important to gather as much information as possible. There is no one source of information, but the multitude of different sources and various information as a puzzle helps to construct the right vision”. Organizational capabilities, information sharing and collaboration between various departments are directly related to new value creation. As it came from the qualitative analysis the main conditions are the “openness” of management vision and strategic flexibility of decision makers. Moreover, high-performing companies participated in our research confirmed that it is very important to adopt an entrepreneurial attitude and to implement “participative” way of collaboration. “On the initial stages of product development, all departments are invited to give their feedback on the product. We organize regularly a brainstorming in order to obtain various perspectives. Cross-functional teamwork brings more value”. Those companies who could create some sort of flexibility in organization of production find themselves mostly on the niche market of hyper-luxury with a very personalized, sometimes even “co-created” watches. In this approach, it is a client, his visions and his preferences that are incorporated into the watch through its design, configuration, functions and complications. This phenomenon also confirms the recent trends on the luxury market of ultimate personalization and unique experience creation that accompanying the product. “People who could acquire almost everything that they want are looking for new experiences. Millennials are willing to pay higher price for personalized high-end and luxury items. The watch became not only the symbol of the status of its owner, but the reflection and continuation of the personality of a client. In this case a unique watch for somebody unique is a great concept”. Managerial recommendations Our research revealed that the concept of the dynamic marketing capabilities as a part of intangible resources of the company could be very beneficial for swiss luxury watchmaking companies in the process of expansion to hyper luxury segment. Managerial contribution of this article lies in new approach illustration that could be used as a support for strategic decision-making in Swiss watch-making companies. The concept of dynamic marketing capabilities is a very complex phenomenon. As a first step for improvement it would be important to get more informed and deeply understand it. In order to create more value and better performance, it is important to deep “intuitive” way of decision making and to implement more explicitly insights coming from practice. Traditionally very segmented industry of Swiss luxury watches is on the road to changes due to radical social and economic changes around the world. Nowadays, company growth and performance requires connecting many elements across various sources of data. There are more opportunities and synergies in initial collaboration on the basic steps of the expansion to hyper luxury segment of watches then filling in the gaps that were not considered in the beginning. Feedbacks from customers and partners could be the most valuable data sources for sustainable changes and following up current trends on the market. Extensive data gathering and analysis, flexibility and learning has a direct impact to the performance. The more internal and external sources engaged into the flexible management and decision making process, the better performance and customer value it could bring. Nowadays, customer is placed in the center of the most of successful businesses. The level of understanding of the customer preferences and values turning to solid insights that could help for better and more efficient performance and decision making processes. Co-created value with customer‟s insights will help to achieve more recognition, exclusivity and appreciation from customers. Direct interactions with wealthy individuals are the main differentiators and value creation mechanisms of a hyper luxury segment of watches. There are numerous opportunities to engage customers in a dialogue instead of traditional for Swiss luxury watchmaking industry one-directional communication. Largely applied in other industries (luxury cars, yachts etc.) this approach is considered to be a niche in the luxury watchmaking. Thus, in our opinion even in the highly traditional industry as Swiss luxury watchmaking it is of great importance to understand and try to implement this dynamic approach and to adopt “Bottom up” management practices. From managerial point of view it is important to encourage curiosity, open-mindedness and cross-departmental communication of the employees. Our key managerial recommendation would be to state that in order to gain competitive advantage, information from the markets, partners and clients should be translated into actionable plans that, once applied, tend to yield concrete results. This transition from data to reconfiguration of processes represents the path that creates more value and competitive advantage in a highly competitive industry. More specifically, firms aimed to compete on the basis of the superior customer service and expansion to the “hyper luxury” sector are advised to invest into building new type of relationship and more dynamic organizational process based on the insights coming from various partners. Limitations and further research avenues The resource advantage theory was predominantly constructed on the theoretical level. In our opinion, such approach could be considered as the key drawback of scientific discourse. Recognition that science and practice produce distinct forms of knowledge has been longstanding. According to Van de Ven (2007), the gap between theory and practice may be a knowledge production problem. The aim of the current research is to suggest a vice versa point of view and to highlight empirical evidence coming from practice. The theoretical contribution of this article to the academic discussion lies in explaining the expansion to the Hyper Luxury Watchmaking Segment based on intangible assets management. We contribute to the development of RBT with its insights deriving from Swiss luxury watchmaking industry. These issues helps us to come up with managerial recommendations and thus to contribute to the advancement of the RBT. The main limitation of this research is in the nature of our research. The exploratory research helped us to identify the key elements in expansion to hyper luxury watch segment by Swiss luxury watchmaking companies. However, this does not allow us to understand the depth of this phenomenon. In order to confirm this results the more profound and focused analysis is needed. It could help to understand deeper micro-foundations of DMC. In addition to that, in our opinion a detailed case study of the firm with outstanding DMC‟s would be particularly valuable. Otherwise, to test quantitatively what are the links between various elements is also a promising avenue for this research.

Background: Scapular downward rotation syndrome (SDRS) is a common scapular alignment impairment that causes insufficient upward rotation and muscle imbalance, shortened levator scapulae (LS) and rhomboid, and lengthened serratus anterior (SA) and trapezius. A modified shrug exercise (MSE), performing a shrug exercise with the shoulders at 150° abduction, is known as an effective exercise to increase scapular stabilizer muscle activation. Previous studies revealed that scapular exercise are more effective when combined with trunk stabilization exercises in decreasing scapular winging and increasing scapular stabilizer muscle activation. Objects: The purpose of our study was to clarify the effect of MSE with or without trunk stabilization exercises in subjects with SDRS. Methods: Eighteen volunteer subjects (male=10, female=8) with SDRS were recruited for this experiment. All subjects performed MSE under 3 different conditions: (1) MSE, (2) MSE with an abdominal draw-in maneuver (ADIM), and (3) MSE with an abdominal expansion maneuver (AEM). The muscle thickness of the lower trapezius (LT) and the SA were measured using an ultrasonography in each condition. Electromyography (EMG) data were collected from the LT, LS, SA, and upper trapezius (UT) muscle activities. Data were statistically analysed using one-way repeated analysis of variance at a significance level of .05. Results: The muscle thickness of the LT and the SA were the significant different in the MSE, MSE with ADIM (MSE+ADIM) and MSE with AEM (MSE+AEM) conditions (p<.05) In both LT and SA, the order of thick muscle thickness was MSE+AEM, MSE+ADIM, and MSE alone. No significant differences were found in the EMG activities of the SA, UT, LS, and LT in all condition. Conclusion: In conclusion, MSE is more beneficial to people with SDRS when combined with trunk stabilization exercises by increased thickness of scapular stabilizer muscles.

Background: The serratus anterior (SA) muscle is one of the important muscles in the upward rotation of the scapula when the arm is raised. Insufficient muscle activity of the SA can cause deformation of the shoulder rhythm resulting in shoulder pathology. Objects: This study intends to compare SA and upper trapezius (UT) activity during the conventional wall-slide and push-up plus exercises for SA muscle strengthening and the scapular upward rotation (SUR) exercise. Methods: A total of 30 subjects participated in this study, and we measured the muscle activity of the SA and UT muscles during the wall-slide, push-up plus and SUR exercises. The one-way repeated ANOVA was used to compare SA and UT muscle activities during the 3 exercises. Results: During the SUR exercise, SA muscle activity was 79.88% maximum voluntary isometric contraction (MVIC), which was significantly higher than its activity during the other 2 exercises. The UT muscle activity was 47.53 %MVIC during the SUR exercise, indicating a significantly higher UT muscle activity than during the other 2 exercises. Conclusion: These findings suggest that the SUR exercise can maximize SA muscle activity to strengthen the SA while keeping UT muscle activity at an appropriate level.

포인세티아 ‘Red Elf’는 국립원예특작과학원에서 2014년에 육성한 품종이다. 진한 적색의 ‘Max Red’와 분홍색의 주름이 많은 상향성의 포엽을 가진 ‘Pink Elf’를 2010년에 교배하여 획 득한 실생 계통을 선발하여 육성한 품종이다. 2012년부터 2013년까지 생육특성, 개화특성, 균일성에 대하여 1, 2차 특성 검정을 실시하였다. 2014년에 3차 특성검정을 실시하여 최종 선발하였으며, 직무육성품종심의회에 상정하여 ‘Red Elf’로 명 명하였다. ‘Red Elf’품종은 적색의 상향성인 포엽과 열편이 거 의 없는 착색엽이 우수한 화형을 형성한다. 초장이 작고 엽병 이 짧은 잎몸을 가진 줄기의 발생이 많아서 균형 잡힌 수형을 이룬다. 단일 처리 후 약 8주가 경과하면 완전히 착색되어 출 하가 가능하다. 이 품종은 2016년 3월 17일에 국립종자원에 품종등록(등록번호 5953호)되었다.

Background: For the treatment of forward head posture (FHP) and forward shoulder posture, methods for strengthening scapular retractors and deep cervical flexors and stretching pectoralis and upper cervical extensors are generally used. No study has yet assessed whether suboccipital release (SR) followed by cranio-cervical flexion exercise (CCFE) (SR-CCFE) will result in a positive change in the shoulders and neck, showing a “downstream” effect. Objects: The purpose of this study was to investigate the immediate effects of SR-CCFE on craniovertebral angle (CVA), shoulder abduction range of motion (ROM), shoulder pain, and muscle activities of upper trapezius (UT), lower trapezius (LT), and serratus anterior (SA) and LT/UT and SA/UT muscle activity ratios during maximal shoulder abduction in subjects with FHP. Methods: In total, 19 subjects (7 males, 12 females) with FHP were recruited. The subject performed the fifth phase of CCFE immediately after receiving SR. CVA, shoulder abduction ROM, shoulder pain, muscle activities of UT, LT, and SA, and LT/UT and SA/UT muscle activity ratios during maximal shoulder abduction were measured immediately after SR-CCFE. A paired t-test and Wilcoxon signed-rank test were used to determine the significance of differences in scores between pre- and post-intervention in the same group. Results: The CVA (p<.001) and shoulder abduction ROM (p<.001) were increased significantly postversus pre-intervention. Shoulder pain was decreased significantly (p<.001), and LT (p<.05) and SA (p<.05) muscle activities were increased significantly post- versus pre-intervention. The LT/UT muscle activity ratio was increased significantly post- versus pre-intervention (p<.05). However, there was no significant change in UT muscle activity and SA/UT muscle activity ratio between pre- and post-intervention (p˃.05). Conclusion: SR-CCFE was an effective intervention to improve FHP and induce downstream effect from the neck to the trunk and shoulders in subjects with FHP.

The aim of this study to investigate the effects of craniocervical flexion on muscle activities of scapular upward rotators during push-up plus exercise in subjects with winging scapula. Eighteen males with scapular winging were recruited, and each subject performed knee push-up plus and other exercises, in two conditions (craniocervical flexion vs. natural head positions). A surface electromyography (EMG) was used to measure upper trapezius (UT), serratus anterior (SA), and lower trapezius (LT) muscle activity. A paired t-test was used to determine the statistical significance between the different condition with/without applying of craniocervical flexion. UT EMG activity significantly decreased and SA EMG activity significantly increased during knee push-up plus involving the craniocervical flexion compared to the natural head position. However, no significant differences (p>.05) were found in the activity of the LT muscle. The UT/SA ratios with and without craniocervical flexion showed a significant difference (p<.05). These results showed that the knee push-up plus other exercises performed with craniocervical flexion could strengthen the serratus anterior muscle and minimize the activity of the UT muscle.

The aim of this study was to compare the electromyographic (EMG) activity levels of the scapular upward rotators [upper trapezius (UT), lower trapezius (LT), and serratus anterior (SA)] and other scapular muscles [posterior deltoid (PD), levator scapulae (LS), and infraspinatus (IS)] during isometric lower trapezius exercises. Twenty males with no medical history of shoulder pain or upper extremity disorders were recruited for this study. EMG activity was recorded from the UT, LT, SA, PD, LS, and IS while subjects performed three different exercises: Prone arm lift (PAL), Backward rocking diagonal arm lift (BRDAL), Modified Prone Cobra (MPC). One-way analysis of variance (ANOVA) was used to determine any significant differences among the three exercises. A lower relative activation of UT, LT, and SA was seen with the MPC than with the other exercises (p<.05). The relatively lower activation of the UT identified, the MPC exercise as the preferred choice for preferential strengthening the LT (p<.05). However, a higher activation in the PD, LS, and IS occurred with the MPC than with the other exercises (p>.05). The recruitment pattern of synergist varied depending on the exercise posture. These findings suggest that exercise posture is an important factor in the selection of strengthening exercise for weak muscle.

The purpose of this study was to investigate the quantitative data of downward pulling tension in subjects with scapular downward rotation syndrome (SDRS) before and after 6-week self scapular upward rotation exercise (SURE) program. Eleven subjects with bilateral SDRS. The downward pulling tension(DPT) was measured digital tension-meter. The tension force data were collected using a surface electromyography before and after a 6-week self-scapular SURE program. The significance of difference between pre- and post-program was assessed using a paired t-test, with the level of significance set at =.05. The results showed that significant differences between pre- and post-SURE program were found for DPT (p<.05). These findings suggest that 6-week self SURE program is effective for reducing DPT in subjects with SDRS. Additionally, our DPT measurement can be useful for maintaining shoulder position and providing quantitative data between pre- and post-SURE program during passive correction of scapular position test.

With the development of artificial lighting technology, human can breakout the limitation of the natural light and make it possible to create a brilliant civilization. However, the wide used outdoor artificial lighting caused severe environmental problem called "Light Pollution" due to human's less cognition of using light and excessive light. Obtrusive light at nighttime can do harm to the human health and observation activity. In this paper, the upward light control process of general lighting fixtures was suggested for reducing the adverse effects such as sky glow in the central city and light trespass in the residential areas.

본 연구는 시가지내에서의 산악경관에 대한 조망점 수직상향 이동의 타당성을 구명함으로써 향후 고층화, 과밀화된 시가지내에서의 조망점 설정방안의 근거 자료를 제시하고자, 첫째 조망점의 수직상향 이동 전후의 산의 시각량 및 앙각의 유의차 분석을 위하여 t-검정 분석을 수행하였으며, 둘째, 산정의 가시여부 및 산의 평균 녹시율을 기준으로 하여 조망점의 수직상향 이동 전후의 시각량을 비교 분석하였다. 이에 따른 본 연구결과는 다음과 같다. 1) 조망점의 수직 상향이동 전후의 단위간 표고차는 평균 15.39m로써 건물 4층 정도의 수준차를 갖는 것으로 판명되었다. 2) 조망점 수직상향 이동 전후의 산의 시각량은 1%의 유의수준에서 현저한 차이가 있는 것으로 확인되었으나 이때의 앙각의 차는 유의하지 않은 것으로 판명되었다. 즉 조망점의 수직 상향이동 전후의 시각구조는 동일하지만 시점 이동후 산의 시각량이 우세하다는 것을 알았다. 3) 산정의 가시와 산의 평균 녹시율을 상회하는 조망점은 건물옥상높이에서의 빈도수가 많았다. 시각량의 t-검정 분석결과 역시 조망점의 수직상향 이동 전후가 5% 유의수준에서 산의 시각량의 차이가 검증되었다. 본 연구 결과는 산을 적절히 조망할 수 있는 앙각권역 내에 고층건물이 밀집되어 있는 시가지가 포함될 때의 조망점 설정시 근거 자료로 활용될 것이다. 시가지내 포함된 조망점들을 대상으로 하여 앙각의 조건에 차이가 나타나지 않는 수준까지 시점을 수직 상향 이동함으로써 불리한 시각량을 확보할 수 있다 수직 이동된 상태는 이동전과는 달리 시점의 특수성이 인정되나, 앙각의 유의차가 나타나지 않는다면 서로 동일한 조망구조로 간주하여 산악 경관관리를 위한 보존적 지 침을 제시할 수 있다.

In the present study we examine physical characteristics of a thin and rigid magnetic flux tube with a steady flow inside, which is embedded vertically upward in the solar atmosphere. We found from this study that (1) The downward material flow gives rise to a dominant heating in the flux tube which works with the conductive heating in the same direction. However, the upflow flow creates a dominant cooling which works against the conductive heating, resulting in a steeper temperature gradient with a shallower transition region. (2) Since the thickness of the transition region determines the material content in the transition region, a broader transition region of the downflow tube produces a larger differential measure.

Non-specular, vertically upward transit, fast-moving radar echoes are observed in the summer polar upper mesosphere near 90 km using 52 MHz VHF radar at Esrange, Sweden. By resolving maximum echo power movement, the unusual meteor trails propagate vertically upward with taking horizontal displacements at an initial speed of 10 km/s exponentially decreasing with increasing height from 85-89 km, lasting for 3.5 sec. Another upward transit is observed as following a downward transit echo target in about ~1 sec, lasting over 5 sec. The upward motion cannot be explained with the dynamics of penetrating meteors or by atmospheric dynamics. The observation proposes that secondary produced plasma jets occurring from meteor trail are possibly responsible for upward fast moving echoes. The long-lasting (3-5 sec), ascending meteor trails at speeds of a few 104 m/s are distinctive from any previous occurrences of meteors or upper atmospheric electrical discharges in the aspect of long-lasting upward/downward motions. This result possibly suggests a new type of meteor-trail leader discharge occurring in the summer polar upper mesosphere and lower thermosphere.

토석류는 흙과 암편들이 물과 혼합되어 비탈면이나 계곡을 따라 흘러내리는 현상으로 액상화된 유동물질이 빠른 속도로 중력방향으로 낙하, 이동하는 현상을 일컫는다. 토석류는 갑작스럽게 그리고 빠른 속도로 발생되기 때문에 해당지역에서는 상당한 피해를 입게 된다. 토석류의 유동성은 유동화된 토질들의 이동거리 및 속도와 관련된다. 토석류의 최대 이동거리와 속도 등과 같은 토석류 거동특성은 토석류 발생 지점의 토질특성, 유동화에 영향을 미치는 내·외부인자 즉, 수리-역학적 특성 및 지형학적 특성에 의해 좌우된다. 이들 유동관련 특성들은 유변학에서 다루는 항복응력, 점성과 같은 유변물성을 통해 해석할 수 있으며, 이러한 유변학적 특성은 토석류 거동특성을 결정하는 주요 매개변수이다. 토석류 초기 발생은 집중호우에 의한 표층 상부 포화에 의한 전단강도 상실, 산 비탈면을 따라 흐르는 간극 유체 압력 및 균열 암반층에서 흘러나오는 상향 침투 압력 등의 작용에 의해 지반이 액상화 되어 발생한다. 이와 같은 다공성 재료인 흙과 간극 유체의 상호작용은 토석류의 동역학적 특성을 이해하는데 중요하다. 흙 시료내의 간극 유체압력은 유동물질의 전단강도를 감소시키는 중요한 요소이며, 이는 일반적인 토석류의 이동거리가 더 크게 나타내는 주요 요인이다. 본 연구에서는 이와 같은 특성을 고려한 토석류의 유변물성 특성을 파악하기 위해 물흐름 특성을 고려한 유변물성 창치를 개발하였고, 이를 모래 시료에 적용하여 수리-역학적 특성이 반영된 유변물성 특성을 파악하였다.

수제는 일반적으로 하천에서의 흐름 방향과 유속을 제어하여 하안 또는 제방을 유수에 의한 침식작용으로부터 보호하기 위한 목적으로 설치될 뿐만 아니라 운하의 운영을 위한 충분한 수심 확보 목적으로도 이용된다. 특히 하천복원 및 자연하천 정비에 대한 관심이 커지면서 수제는 국부적인 흐름제어와 수중서식처 조성을 위한 주요 수공구조물로 제시되고 있다. 수제는 단일구조물로 설치되는 경우보다는 군수제의 형태로 설치되어 지는데 군수제의 경우 설치간격에 따라 수제역내 흐름이 다양하게 변화하기 때문에 수제간격은 군수제 설계에 있어서 가장 중요한 설계인자라 할 수 있다. 본 연구에서는 설치간격에 따라 다양하게 변화되는 수제주변 및 수제역내 흐름에 대한 검토를 통해 상향수제를 대상으로 수제설치에 따른 적절한 간격을 제시하고자 하였다. 이를 위해 주흐름영역과 재순환영역으로 구분하여 수제주변에서 발생하는 흐름을 대상으로 검토하였다. 주흐름영역은 통수능 저감으로 인해 증가된 유속이 하상안정성에 영향을 미치는 인자로 설치간격에 따른 최대유속의 변화에 대하여 검토하였다. 수제역내 재순환흐름은 수제역내 세굴 및 퇴적에 영향을 미치는 요소로서 수제역내 흐름 및 제방의 안정성에 문제를 야기시킬 수 있다. 재순환영역은 회전류의 규모와 제방부 안정성에 영향을 미치는 제방주변에서의 흐름에 대하여 분석하였으며, 수제역내 발생하는 회전류의 중심점 위치변화에 대한 비교검토를 수행하였다. 결과를 종합적으로 검토한 결과 상향수제설치에 따른 유속저감, 하상안정성 확보, 수제역내 역류로 인한 제방안정성 확보 등을 고려하였을 때 적절한 설치간격은 최소 4배에서 최대 6배 이내로 설치할 것을 제안하고자 한다.