Background: Pulmonary fibrosis (PF) is a progressive lung disease marked by excessive fibrosis and declining respiratory function. While pharmacological treatments help manage symptoms, they offer limited reversal of fibrosis and often have side effects. As a result, interest in rehabilitation approaches such as breathing exercises combined with self-myofascial release (SMR) has increased. These techniques may enhance trunk stability and thoracic flexibility, contributing to improved respiratory function. Objectives: This study investigated the effects of thoracic expansion exercises using SMR techniques on pulmonary function and chest mobility in a patient with PF, and assessed their clinical applicability. Design: Single-subject A-B-A′ design. Methods: A 60s male with idiopathic PF underwent 20 days of intervention. Standard rehabilitation was applied during baseline (A) and follow-up (A′) phases. During the intervention (B), SMR-based breathing exercises were added. Outcomes included Functional Reach Test (FRT), chest expansion, and pulmonary function tests (FVC, FEV₁, PEF, FEV₁/FVC). Data were analyzed using the 2SD band method. Results: FRT improved from 23.4 cm (A) to 31.3 cm (B) and 34.2 cm (A′). Chest expansion increased from 1.7 cm to 2.8 cm, and FVC rose from 1.70 L to 2.08 L before dropping to 0.94 L. FEV₁/FVC improved from 80.8% to 86.7% during intervention but decreased at follow-up. Conclusion: SMR-based thoracic expansion exercises may enhance trunk stability, thoracic mobility, and certain pulmonary function indicators in PF patients. These findings suggest potential clinical benefits, warranting further studies to confirm long-term effectiveness.

Background: The progressive digitalization of contemporary life, coupled with prolonged sedentary behavior, has contributed to the widespread occurrence of forward head posture (FHP) in the general population. Among the various exercise interventions aimed at correcting FHP, stretching exercises and proprioceptive training have garnered significant attention. Objectives: To investigate the effects of stretching exercises and proprioceptive training on craniovertebral angle (CVA), an indicator of forward head posture (FHP), and on the muscle tone of the suboccipital muscles. Design: Randomized controlled trial. Methods: Thirty participants were randomly assigned to either the stretching exercise group (n=15) or the proprioceptive training group (n=15), and each group underwent intervention three times per week for six weeks. CVA and muscle tone of the suboccipital muscles were measured before and after the six-week intervention, and the results were statistically analyzed for comparison. Results: Both groups showed a significant increase in CVA after the intervention (P<.05), with no significant difference between the groups. The muscle tone of the suboccipital muscles did not show statistically significant changes either within or between the groups. Conclusion: Six weeks of stretching exercise and proprioceptive training both resulted in a significant increase in CVA, demonstrating that both interventions are effective in improving FHP. However, neither intervention produced significant changes in the muscle tone of the suboccipital muscles.

Background: Flexible flatfoot impairs gait and posture by weakening arch support, potentially leading to musculoskeletal dysfunction. Strengthening exercises, such as the short foot exercise (SFE), have shown promise in correcting this condition. Objectives: This study aimed to investigate the effects of SFE with visual feedback on medial arch height and foot function in adults with flexible flatfoot. Design: Experimental research. Methods: Adults diagnosed with flexible flatfoot were randomly assigned to either an experimental or control group. The experimental group performed SFE with visual feedback, whereas the control group performed the same exercises without feedback. Both groups trained three times per week for five weeks. Outcome measures included the Navicular Drop Test (NDT), YBalance Test (YBT), and Tetrax postural analysis. Results: In the NDT, both groups showed significant improvements (P<.05), while in the YBT, only the experimental group showed a significant improvement (P<.05). In contrast, there were no significant changes in the Weight Distribution Index (WDI) and Stability Test (ST) areas of the Tetrax system in either group (P>.05). Conclusion: SFE effectively improved arch height regardless of visual feedback, though only the visual feedback group showed significant improvements in dynamic balance. However, between-group differences were not statistically significant, suggesting that visual feedback provides subtle rather than substantial additional benefits. Further research with larger samples is needed to establish the clinical value of adding visual feedback to SFE protocols.

Background: Chronic nonspecific low back pain (CNLBP) is a common musculoskeletal condition among middle-aged adults, often causing physical limitations and reduced quality of life. Transcutaneous electrical nerve stimulation (TENS) is a widely used non-pharmacological method for pain relief and muscle modulation. Objectives: To compare the effects of two high-frequency, high-intensity TENS protocols on pain, muscle tone, and stiffness in individuals with CNLBP. Design: Single-blinded, randomized controlled trial. Methods: Twenty-eight individuals with CNLBP were randomly assigned to an experimental group (EG) or control group (CG). Both received 60 Hz, highintensity TENS twice weekly for four weeks. Pain equivalent current (PEC), visual analogue scale (VAS), pain degree (PD), muscle tone (Hz), and stiffness (N/m) were measured pre- and post-intervention by a blinded assessor. Results: The EG showed significant improvements in all outcomes (P<.05), while the CG showed significant change only in VAS scores. Between-group analysis showed greater reductions in pain and muscle-related variables in the EG. Conclusion: The EG protocol, with individualized intensity adjustments and targeted stimulation sites, was more effective than the CG protocol in improving pain, muscle tone, and stiffness in adults with CNLBP.

Background: Foam roller exercise is widely used for myofascial release and improving joint range of motion. Objectives: This study aimed to identify the most effective session of thoracic foam roller exercise by examining changes in thoracic kyphosis angle (TKA) and trunk active range of motion (AROM) in healthy males in their 20s. Design: Single-group design. Methods: The study analyzed changes in TKA and trunk AROM across sessions following the application of a thoracic foam roller exercise for 45 seconds per session over three sessions in 16 healthy males in their 20s. Results: Compared to pre-test values, TKA significantly decreased and trunk AROM significantly increased after thoracic foam roller exercise (P<0.01). Post hoc analysis showed a significant decrease in TKA in session 3 compared to session 1 (P<0.01). Trunk AROM (flexion, left lateral flexion, right lateral flexion) showed significant changes in sessions 2 and 3 compared to session 1 (P<0.01). Right rotation significantly improved in session 3 compared to session 1 (P<0.01). Conclusions: For managing thoracic vertebral alignment in healthy males in their 20s, three sessions of thoracic foam roller exercise per day are recommended. For improving trunk AROM management, two sessions per day be sufficient.

Background: Stroke often results in hemiparesis, which leads to asymmetrical plantar pressure and impaired balance control. The gastrocnemius muscle plays a key role in plantar flexion and postural stability. Dysfuncion of this muscle is associated with decreased posterior foot pressure and increased fall risk in stroke patients. Objectives: To investigate the effects of gastrocnemius muscle stimulation using microcurrent stimulation therapy on plantar pressure distribution and functional balance in stroke patients. Design: Randomized controlled trial. Methods: Twenty chronic stroke patients were divided into an experimental group (microcurrent stimulation therapy+conventional rehabilitation therapy) and a control group (conventional rehabilitation therapy only). plantar pressure (posterior foot pressure), center of anteroposterior pressure displacement (CAP), and balance ability were measured using the berg balance scale (BBS) and functional reach test (FRT) before and after 8 weeks of intervention. Results: The experimental group showed statistically significant increases in posterior foot pressure and reductions in CAP after intervention. BBS and FRT scores also significantly improved. Although the control group showed some improvements, the changes were smaller and less consistent. Conclusion: Microcurrent stimulation targeting the gastrocnemius muscle improved plantar pressure symmetry and postural stability in stroke patients, suggesting its effectiveness as an adjunctive balance rehabilitation intervention.

Background: The Functional Movement Screen (FMS) is widely used for movement assessment but suffers from subjective scoring that leads to inconsistent evaluations. While previous studies have focused on reliability, the validity of AI-supported assessment remains unexplored. Objectives: To evaluate the reliability and validity of an AI-based motion analysis system using MediaPipe for three FMS movements. Design: Prospective reliability and validity study with repeated measures. Methods: Thirty healthy adults (age 23.4±2.8 years) performed three FMS tests (Deep Squat, Hurdle Step, Inline Lunge) recorded on video. Three evaluators (two experienced physical therapists and one novice) assessed recordings in three phases: Phase 1 involved traditional assessment by experts only to establish criterion reference, Phase 2 had all evaluators using AI support, and Phase 3 consisted of repeated AI-supported assessment. The AI system provided real-time visual feedback of joint angles and alignment through MediaPipe skeletal tracking. Results: Criterion validity showed strong agreement between traditional expert assessment and AI-supported assessment (r=0.94, P<.05). Inter-rater reliability improved from good (ICC=0.89) to excellent (ICC=0.91) with AI support. The novice evaluator achieved immediate expert-level performance with only 0.05 points difference from experts. Intra-rater reliability was excellent for all evaluators (ICC=0.84-0.89). Conclusion: The AI-based system demonstrated strong validity and improved reliability for fundamental movement assessment. While AI support enabled novice evaluators to achieve expert-level performance immediately, it may increase sensitivity to subtle movement variations. This technology shows promise for standardizing movement screening, though current limitations restrict its application to standing movements.

LGBTQ+ 권리와 종교의 자유의 조화를 위한 2015년 미국 유타주의 입법 타협 안은 양측의 권리를 둘러싼 갈등이 첨예하게 대립하는 상황 속에서 실질적이고 의미 있는 입법적 진전을 이룬 사례로 평가된다. 이 타협안이 마련되기 전까지 유타주는 성적 지향과 성 정체성에 기반한 차별로부터 개인을 보호하는 포괄적인 주(州) 차원의 법적 장치를 갖추지 못한 상태였다. 그러나 동성 결혼의 합법화와 같은 사법 판결, 시민 여론의 급격한 변화, 예수 그리스도 후기 성도 교회(LDS 교회)의 결정적인 지지 등이 계기가 되어, 성소수자 옹호 단체, 종교 단체, 입법 자, 기업인 등 다양한 이해관계자들이 협상 테이블에 함께하게 되었다. 그 결과 두 개의 상호보완적 법안이 제정되었는데, SB 296은 LGBTQ+ 개인을 위한 고용 및 주거 차별 금지를 주 전체로 확대하는 한편, 종교 기관에 대한 특정 예외 조 항을 포함하였고, SB 297은 결혼과 성과 관련된 종교적 표현의 자유와 양심적 거부권을 보호하는 내용을 담고 있다. 이 입법 타협은 시민적 다원주의와 실용적 정치 협상의 모범 사례로 많은 찬사를 받았지만, 동시에 보수와 진보 양측으로부 터 비판도 제기되었다. 보수 진영은 이 법안이 성소수자의 권리를 법적으로 인정 함으로써 종교의 자유를 훼손했다고 보았고, 진보 진영은 종교적 예외 조항이 평 등권의 실현을 지나치게 제한한다고 주장했다. 그럼에도 불구하고, 유타주의 경 험은 민주주의적 거버넌스, 상호 존중에 기반한 공존, 그리고 실용적 협상이라는 측면에서 중요한 통찰을 제공한다. 본 논문은 유타 절충안의 역사적 배경, 협상 과정, 입법 내용, 사회적 반응 및 정책적 함의를 분석하고, 특히 한국 사회에서 현재 논의되고 있는 LGBTQ+ 권리와 종교 자유의 균형 문제에 이 모델이 갖는 비교적 시사점을 제공한다.

This study aimed to develop and evaluate goji berry (Lycium barbarum) beverages with enhanced sensory quality through the addition of fruit extracts. Five formulations were prepared using hot water extracts of dried goji berries, blended with varying proportions of concentrated apple and aronia extracts. Each beverage was adjusted to 7 of °Brix and standardized with citric acid and stevia to ensure consistent sweetness and acidity. Sensory evaluation was conducted by 20 panelists using a 9-point hedonic scale to assess sweetness, sourness, bitterness, color, aroma, and overall acceptability. Significant differences among samples were confirmed through one-way ANOVA and Tukey’s HSD post-hoc test. Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA) were performed to explore patterns in the sensory data. The beverage formulation containing 70% goji berry extract, 15% apple extract, and 14.93% aronia extract, along with sodium citric acid and stevia, demonstrated the highest overall acceptability among all samples. This was followed by the formulation composed of 70% goji berry extract, 15% apple extract, and 15% aronia extract. Principal component analysis (PCA) identified sweetness, aroma, and overall acceptability as the primary sensory attributes influencing consumer preference, with the first two principal components accounting for 95.61% of the total variance. Hierarchical cluster analysis (HCA) further confirmed these findings by grouping the two formulations together based on their sensory profiles. In conclusion, blending goji berry extract with complementary fruit extracts such as apple and aronia significantly improves the sensory quality and consumer acceptability of functional beverages. These findings suggest that optimized fruit blending may be a promising strategy for enhancing the palatability and marketability of goji-based health beverages.

본 연구는 DNVGL-CG-0127 및 통합공통구조규칙(H-CSR)이 적용된 유한요소해석(FEA)을 통해 검증된, 기존 드라이도킹의 지 속 가능한 대안으로서 안벽 부유식 구조 보수의 타당성을 연구하였다. 정수압 하중을 받는 75K 제품 운반선의 전역 및 국소 거동을 시뮬레이션하여, 보수가 필요한 무시할 수 있는 변위 변화(<1%, 12.3mm~12.4mm)와 von-Mises 응력(26.4MPa, 허용 한계값 188MPa의 14%) 에서, 구조적 무결성을 확인했다. 최적화된 보수 설계는 고강도 해양 등급 강재(예: AH36)와 하위 모델링 기법을 활용하여 Saint-Venant 의 원리와 선형 탄성 가정을 준수하면서 기하학적 불연속점의 응력 집중을 해결하였다. 선급 지침을 준수하면 유체역학적 안정성과 하 중 경로 충실도가 보장되어 선박 운항 중단을 최소화할 수 있습니다. 본 연구 결과는 비용 효율적이고 시간 효율적인 유지보수로의 패 러다임 전환을 보여주며, 기존 방식 대비 가동 중단 시간을 최대 30% 단축합니다. 향후 추진 방향에는 동적 하중 하의 피로 분석, AI 기반 최적화, 그리고 실시간 구조 건전성 모니터링을 위한 디지털 트윈 통합이 포함되며, 이는 해양 탈탄소화 및 운영 민첩성 목표 달 성에 부합한다. 본 연구는 노후화된 선박의 성능 개선을 위한 확장 가능한 프레임워크를 제공하며, 계산 정밀도와 지속가능성에 대한 업계의 요구를 충족한다.

선박용 프로펠러는 선박 추진 성능과 연비에 직접적인 영향을 미치는 핵심 부품으로, 제작 과정에서 높은 정밀도가 요구된다. 사형주조는 복잡한 형상의 금속 부품 제작에 널리 사용되는 공정이지만, 주조 과정에서 발생하는 열적 팽창과 냉각 수축은 최종 치수 오 차와 가공 비용 증가를 초래하는 주요 원인이다. 본 연구에서는 사형주조 과정에서 발생하는 열팽창 및 수축 현상을 정밀하게 예측하고, 이를 고려한 최적의 치수 여유 설정을 통해 연마 작업을 최소화하는 설계 방안을 제안하였다. 알루미늄 청동 합금(ALBC3)을 사용한 프로 펠러를 대상으로 열팽창 공식과 유한요소해석(FEM)을 적용하여 블레이드, 허브, 전체 지름 등 각 부위별 변형을 정량적으로 분석하였다. 분석 결과, 블레이드 너비와 두께는 약 1.9%, 허브 직경은 1.5%, 전체 지름은 2.0%의 여유를 두는 것이 적절한 것으로 나타났다. 이러한 최 적 치수 여유를 적용한 결과, 최대 23kg의 재료 절감, 30만 원 이상의 제작 비용 절감, 작업 시간 50~60% 단축 등의 정량적 개선 효과가 확인되었다. 최적 설계를 적용함으로써 추가 연마 작업과 재료 손실을 줄일 수 있으며, 이에 따른 비용 절감 효과도 기대된다. 본 연구 결 과는 선박용 프로펠러 제작 과정의 품질 향상과 생산성 제고에 기여할 수 있을 것으로 판단된다.

This study examined how perceived scarcity influences consumer purchase decisions in the context of preorder fashion, with a focus on the mediating role of purchase pressure and the moderating role of hedonic shopping value. A survey was conducted with 300 consumers who had previously purchased fashion products through preorder platforms in Korea. The key constructs –limited time/quantity scarcity, product scarcity, time pressure, financial pressure, purchase delay, purchase intention, and compulsive buying– were validated using exploratory and confirmatory factor analysis. Structural equation modeling showed that perceived scarcity significantly increased purchase pressure. Specifically, limited time/quantity scarcity heightened time pressure, while product scarcity heightened both time and financial pressure. In turn, time pressure positively influenced both purchase intention and compulsive buying, whereas financial pressure led to increased purchase delay. Mediation analysis confirmed that time pressure fully mediated the relationship between limited time/quantity scarcity and both purchase intention and compulsive buying, while product scarcity exerted both direct and indirect effects, particularly on compulsive buying. A multigroup analysis further revealed that hedonic shopping value did not moderate the overall structural model but had significant effects on specific paths. Consumers with high hedonic shopping value were more sensitive to product scarcity and experienced greater purchase pressure than those with low hedonic shopping value. These findings offer valuable insights for marketers who employ scarcity tactics in preorder strategies and highlight the importance of psychological mechanisms in shaping consumer behavior. Theoretical implications and future research directions are also discussed.

This study aims to analyze the expressive characteristics and aesthetic meanings of the uncanny in digital fashion, exploring its potential as a significant aesthetic device within contemporary fashion discourse. Drawing on theoretical frameworks by Freud, Heidegger, and Lacan, the study examines how digital fashion imagery disrupts conventional aesthetic norms through uncanny visual expressions that evoke psychological tension and perceptual ambiguity. A combined methodology of comprehensive literature review and systematic empirical case analysis was employed. A total of 96 digital fashion examples were collected from platforms including Google, YouTube, Showstudio and Instagram between January 2020 and March 2025. Selection criteria specifically targeted images exhibiting morphological variability, sensory instability, and ontological uncertainty, which are the three core expressive characteristics identified through both theoretical insights and empirical analysis. The results confirmed the consistent presence of these expressive characteristics in digital fashion works and further illuminated their aesthetic implications: digital fashion reconfigures the sensory framework, blurs ontological boundaries, and expands aesthetic experience by challenging viewers’ perceptual and cognitive expectations. In conclusion, this study deepens understanding of digital fashion aesthetics by systematically examining the uncanny within digital contexts and highlights the potential of digital fashion to expand aesthetic boundaries and possibilities for expressions based on sensory experiences.

The purpose of this study is to develop customized suit designs incorporating flower and bird painting patterns from Korean folk painting and to propose differentiation strategies for customized fashion design in Korea. The research was conducted in three stages. First, concepts and types of customization were examined through theoretical analysis, identifying the characteristics of customized design. Second, flower and bird painting patterns found in Korean folk painting were classified according to their symbolic meanings and developed into digital patterns. Third, flower and bird painting patterns from Korean folk painting were utilized in the suit designs following the principles of customized design. The results are as follows. Customizations were classified into three types: simple combination, selective adjustment, and creative assembly. The characteristics of customized design were identified as customer participation and product modularity. The symbolic meanings of the flower and bird motifs were categorized into six themes: happiness, wealth, longevity, fertility, love, and protection against evil. The resulting digitally developed patterns sought to integrate traditional cultural elements into customized fashion design. The final suit designs demonstrated hyper-individuation through modular assembly, enabling both customer participation design and product modularity. Detachable elements that modularize the jacket structure enhanced customizability while promoting sustainable and eco-conscious design practices.

This study explores the temporal changes in and structural characteristics of consumer discourse on the Hanbok experience from 2015 to 2024. A total of 9,227 posts containing the keyword “Hanbok experience” were collected from Naver and Daum news, blogs, and cafes using Textom text mining software. The study period was divided into three phases: 2015–2017 (popularization), 2021–2022 (post-pandemic consumption shift), and 2023–2024 (global expansion and digital integration). Frequency and term frequency-inverse document frequency (TF-IDF) analyses were conducted on key terms, followed by semantic network analysis and community detection using the Wakita–Tsurumi algorithm to compare discourse structures across periods. Additionally, quadratic assignment procedure (QAP) correlation analysis with UCINET was used to examine discourse continuity and change. Consumer discourse consistently featured keywords related to traditional tourist sites, services, and emotional experiences, with online and regional content emphasized during the pandemic. Recently, discourse evolved by integrating digital technologies, K-pop, and metaverse trends, reflecting new cultural consumption forms. Spatially, the focus shifted from Seoul to regional and modern spaces, while experience methods and events diversified beyond traditional frameworks. Network analysis showed recurring core clusters, indicating resilient key concepts despite social shocks, such as the pandemic. Hanbok experiential tourism evolved from a focus on traditional culture to one that combines modern fashion and digital technology. This study underscores the evolving role of hanbok experiences as a sustainable cultural tourism product that integrates fashion, digital technology, and immersive event design, providing valuable insights for future tourism and cultural content development.

Background: The integration of gamification in education necessitates understanding the relationship between learner characteristics and educational outcomes. Methods: This study explores the correlation between Bartle’s player types (Achiever, Explorer, Socializer, Killer) and Reid’s perceptual learning styles (Visual, Auditory, Tactile, Kinesthetic) among 343 South Korean nursing students. Results: Socializer was the most common player type (34.7%), and Auditory learning was the most preferred style (31.7%). Significant correlations were found, such as Achievers aligning with Auditory styles and Explorers with Kinesthetic styles. Conclusion: These results emphasize the need for gamification-based nursing education programs tailored to diverse learner profiles, offering a pathway to enhance engagement and learning outcomes.

This study aims to identify the diverse types and characteristics of signatures that appear in contemporary fashion while primarily brand focusing on emerging Korean designer brands. To this end, qualitative content analysis using news articles and in-depth interviews with 15 emerging Korean designers were conducted. The news article analysis revealed six types of signatures: design based on formative sensibility expression, strategically constructed designer/brand identity, brand practices carried by cultural and spatial experiences, craftsmanship and custom production, contemporary reinterpretation of traditional designs, and text-based visual symbolic systems. The result of the in-depth interviews identified five types of signatures among emerging Korean designer brands: design expressions evolving from designer and brand identity, production emphasizing practicality and craftmanship, brand experiences based on spaces, visual narrative symbolism, and limited-edition items. Unlike established fashion brands that focus on fixed visual or textual elements through strategic planning by the established fashion brands, emerging Korean designer brands gradually and dynamically develop signatures which are grounded in personal philosophy, ethical values, and ongoing interaction with consumers. The findings of this study imply that the signatures of emerging Korean designer brands are not merely aesthetic repetitions, but are instead representations of evolving and situated expressions that interacts with and responds to socio-cultural changes and contexts.

본 연구는 중부지역에서 사료작물인 수단그라스 교잡종(Sorghum x Sudangrass hybrid, SX-17)의 기후 영향에 대한 취약성을 평가하고 생산성에 영향을 미치는 주요 기후 요인을 규명하고자 2017년부터 2018년까지 충청북도 충주와 충청남도 청양에서 현장 실험을 수행하였으며, 기후 취약성은 농촌진흥청에서 정의한 지수를 활용하여 평가하고 기온 및 강수량 자료는 기상청에서 제공받았다. 2018년의 수단그라스 교잡종의 생초 및 건물 수량은 고온과 가뭄 스트레스로 인해 2017년에 비해 현저히 감소하였고, 두 지역 모두 2010년 이후 기후 취약성 증가 추세를 보였으며 2018년에 최대값인 0.7에 도달하였고, 이러한 결과는 극한 기상 현상이 사료작물 생산성에 부정적인 영향을 미친다는 점을 부각시 키며 기후영향 취약성 평가는 기후변화 시나리오 하에서 효과적인 농업 적응 전략 수립을 위한 기초자료로 활용될 수 있음을 시사한다.

Using the S-O-R framework, this study investigates the psychological mechanisms underlying consumer behavior in live commerce. Social presence, consumer trust, and service satisfaction were selected as key variables, and their influence on service adoption intention was empirically examined. A survey was conducted with consumers in their 20s, and data were analyzed using regression analysis and PROCESS Macro Model 6. Findings show that platform interactivity significantly enhances social presence. Source characteristics positively impact both consumer trust and service satisfaction, while content informativeness exerts a statistically significant positive influence on all three variables. Mediation analysis revealed that social presence affects adoption intention indirectly via service satisfaction and also through sequential dual mediation involving trust and satisfaction. The direct path from social presence to adoption intention was not significant, underscoring the critical role of service satisfaction in the adoption process. These results suggest that while interactivity strengthens perceived social presence, it is ultimately trust and satisfaction shaped by source credibility and content informativeness that drive adoption intention. The study contributes to understanding of consumer psychological responses in digital retail environments and offers practical implications. Enhancing content quality and strengthening source appeal are essential strategies for boosting consumer adoption of live commerce services.